Patent Publication Number: US-2009229672-A1

Title: Method of constructing cold and hot water piping system

Description:
TECHNICAL FIELD 
     The present invention relates, in general, to methods of constructing cold and hot water piping systems and, more particularly, to a method of constructing a cold and hot water piping system which improves piping ability when installing cold and hot water pipes in a building construction site, such as a house, multi-family dwellings or apartment buildings, and which fundamentally prevents the cold and hot water pipes from being damaged. 
     BACKGROUND ART 
     As well known to those skilled in the art, when constructing a building, cold and hot water pipes are installed. The cold and hot water pipes supply cold water and hot water to desired locations in the building. Typically, the cold and hot water piping process is conducted before concrete is applied to floors and walls in the building. 
     Each of the conventional cold and hot water pipes has a single-pipe structure. The cold and hot water pipes are fastened to iron reinforcing bars, which are previously arranged, using fastening wires. Furthermore, the cold and hot water pipes are connected to water service boxes, which are set at desired locations. Before the cold and hot water pipes are connected to the water service boxes, the cold and hot water pipes are led to and branched by a distributor. The branched cold and hot water pipes are distributed to desired locations in the building. 
     As such, cold and hot water pipes are connected to a water service box and, thereafter, a water tap is coupled to an end of each of the cold and hot water pipes, thus supplying cold water and hot water through the water taps. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     Such a conventional cold and hot water piping system meets the needs of users. However, when applying concrete to the floors and the walls of the building after the cold and hot water pipes are fastened to the iron reinforcing bars, there is a possibility of damage to the cold and hot water pipes from outside impact. Furthermore, when water leakage occurs in a floor or a wall of the building after the building construction has been completed, it is impossible to rapidly respond to the situation. 
     In detail, when water leakage of the cold or hot water pipe occurs after building construction has been completed, concrete around a related portion must be removed to replace a damaged cold or hot water pipe with a new one. After the pipe replacement process is completed, the related portion must be restored by applying concrete to that portion. As such, the conventional art has disadvantages of additional economic loss and time loss. 
     Technical Solution 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of constructing a cold and hot water piping system which fundamentally prevents cold and hot water pipes from being damaged, and in which even if water leakage occurs, a user can rapidly respond to the situation. 
     In an aspect, the present invention provides a method of constructing a cold and hot water piping system, including: a distributor connecting step of connecting double pipes, which are cold and hot water pipes, between an outside water source and a distributor, which includes: a case, having a box shape which is open at a front end thereof, installed in a wall of the building; a door coupled to the open front end of the case; a drain hole formed in a bottom of the distributor; and a drain water guide pipe coupled to the distributor such that the drain water guide pipe communicates at an upper end thereof with the drain hole of the distributor and is placed at a lower end thereof adjacent to a sewer outlet of the building; a water service box disposing step of disposing a water service box, which comprises a case, having pipe ports, and a door, at a desired place; a water service box setting step, comprising the steps of: extending the double pipes from the distributor to the water service box; fastening the double pipes to a plurality of iron reinforcing bars using fastening wires; and installing a plurality of load support units on the iron reinforcing bars at positions adjacent to the double pipes so as to support the double pipes; and a water tap coupling step, comprising the steps of: coupling first ends of flexible hoses, which couple the double pipes to water taps, to soft pipes, placed in the double pipes, using first reducing sockets inserted in pipe ports of the water service box; and coupling second ends of the flexible hoses to the water taps using second reducing sockets, wherein the water service box comprises: a plurality of frictional protrusions provided on an outer surface of the door; a repair opening formed at a predetermined position through the door; a rim part provided on an inner edge of the door, defining the repair opening; an openable plate coupled to the rim part of the door, with a plurality of socket insert holes formed in the openable plate so that the second reducing sockets, into which connection pipes of the water taps are inserted, are fitted into the respective socket insert holes of the openable plate. 
     The water service box disposing step may include the step of: installing the water service box, which comprises the case having the pipe port and the door, at the desired position in a wall of the building, so that the water service box is integrated with the wall. 
     The distributor may include: the case, having a box shape which is open at the front end thereof, installed in the wall of the building; the door coupled to the open front end of the case; the drain hole formed in the bottom of the distributor; and the drain water guide pipe coupled to the distributor such that the drain water guide pipe communicates at the upper end thereof with the drain hole of the distributor and is placed at the lower end thereof adjacent to the sewer outlet of the building. 
     The water tap coupling step may include the steps of: fitting valve socket seats into the door of the water service box; coupling an end of each of the double pipes, which enter the water service box, to each of the valve socket seats using double pipe connection nuts; coupling the soft pipe, placed in each of the double pipes, to a valve socket, provided in each of the valve socket seats, using soft pipe connection nuts; and coupling the water tap to each of the valve sockets. 
     The water tap coupling step may include the steps of: coupling the first ends of the flexible hoses, which couple the double pipes to the water taps, to the soft pipes placed in the double pipes, using the first reducing sockets inserted in the pipe ports of the water service box; and coupling the second ends of the flexible hoses to the water taps using the second reducing sockets, wherein the water service box comprises: the frictional protrusions provided on the outer surface of the door; the repair opening formed at the predetermined position through the door; the rim part provided on the inner edge of the door defining the repair opening; the openable plate coupled to the rim part of the door, with the socket insert holes formed in the openable plate so that the second reducing sockets, into which the connection pipes of the water taps are inserted, are fitted into the respective socket insert holes of the openable plate. 
     Each of the flexible hoses is provided with a coil spring on an inner or outer surface thereof. 
     In the case having no water service box, the method constructing the cold and hot water piping system may include the steps of: mounting an elbow to a front end of each double pipe; fastening a support plate, into which a valve socket seat coupled to a front end of the elbow is fitted, to the wall; coupling a front end of a soft pipe of the double pipe to a valve socket using a soft pipe connection nut; fitting the valve socket into the valve socket seat; and coupling a water tap to the valve socket. 
     The method of constructing the cold and hot water piping system may further include the steps of: installing a pipe freezing prevention switch in a household distribution box disposed around the outside water source; installing a temperature sensor in a water gauge box disposed ahead of the distributor; coupling a removable plug unit to a box-built-in type electric plug socket provided under an upper surface of each water service box that is located at a side of the building; and inserting heating wires, connected to the plug unit, into the respective double pipes. 
     The method of constructing the cold and hot water piping system may further include the steps of: providing a support box around lower portions of the cold and hot water pipes installed in the wall of the building; and leading a heating pipe, installed in a floor of a room of the building, into the support box such that a portion of the heating pipe is placed adjacent to portions of the cold and hot water pipes which are placed in the support box. 
     In another aspect, the present invention provides a method of constructing a cold and hot water piping system having a wall-built-in type boiler case assembly provided with a case and a case cover. The wall-built-in type boiler case assembly includes: a boiler holder provided on a rear wall of the case; a pipe insert hole formed through a lower surface of the case; a bracket provided on an outer surface of each corner of the case cover; a discharge pipe insert hole and an intake pipe insert hole formed through an upper end of the case cover; a door, having vent holes and an opening and closing button therein, provided below both the discharge pipe insert hole and the intake pipe insert hole, so that the case cover is integrally coupled to the case. The method of constructing a cold and hot water piping system includes the steps of: providing a piping box, which has a size appropriate to conduct piping work, below a boiler such that the piping box is integrated with the boiler case assembly; forming a wall chamber in a wall at a position corresponding to the piping box; arranging a double pipe, having an inner diameter larger than an outer diameter of a hot water pipe, from a lower end of the wall chamber to a distributor; and arranging the hot water pipe along the double pipe, so that the hot water pipe is connected to the boiler through the wall chamber and the piping box, thus preventing the hot water pipe from being exposed outside. 
     The piping box may include a door provided on a front end of the piping box; a cover plate coupled to a lower end of the piping box; and a pipe insert hole formed through a rear wall of the piping box. 
     The piping box may be separated from the boiler case assembly, so that the piping box is removably coupled to the boiler case assembly using locking members. 
     The openable plate and the flexible hoses may be integrated with each other, such that a smooth opening or closing motion of the openable plate is conducted. 
     ADVANTAGEOUS EFFECTS 
     As described above, the present invention provides a method of constructing a cold and hot water piping system in which cold and hot water pipes, each having a double pipe structure, are connected to and branched by a distributor and, thereafter, the cold and hot water pipes, branched by the distributor, are connected to water service boxes, disposed at desired places, after being fastened to iron reinforcing bars such that the cold and hot water pipes are spaced apart from each other by a predetermined distance, so that the cold and hot water pipes are prevented from being damaged, and even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. 
     As well, when constructing the cold and hot water pipes, load support units are disposed under the iron reinforcing bars at positions adjacent to the double pipes such that the load support units are spaced apart from each other at regular intervals, thus efficiently preventing the iron reinforcing bars and the double pipes from being undesirably deformed. 
     Furthermore, because the cold and hot water pipes, which respectively supply cold water and hot water to desired places, have double pipe structures, even if water leaks from the pipe, leaking water enters the distributor and is discharged to the outside. In addition, even if water leakage occurs at joints in the distributor, leaking water is also discharged from the distributor to the outside. Therefore, the present invention prevents leaking water from soaking through a wall or floor of a building. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a flowchart showing a method of constructing a cold and hot water piping system, according to the present invention; 
         FIG. 2  is a view showing an arrangement of the cold and hot water piping system according to the present invention; 
         FIG. 3  is a view showing an example of a portion of the cold and hot water piping system according to the present invention; 
         FIG. 4  is a perspective view of a double port type water service box according to a first embodiment of the present invention; 
         FIG. 5  is a perspective view showing a single port type water service box according to the first embodiment of the present invention; 
         FIG. 6  is a plan view showing cold and hot water pipes supported by a plurality of iron reinforcing bars, according to the second embodiment of the present invention; 
         FIG. 7  is a sectional view showing the cold and hot water pipes supported by the iron reinforcing bars, according to the second embodiment of the present invention; 
         FIG. 8  is a perspective view showing a distributor according to a third embodiment of the present invention; 
         FIG. 9  is a sectional view showing the distributor of the third embodiment of the present invention; 
         FIG. 10  is a perspective view showing a water service box according to a fourth embodiment of the present invention; 
         FIG. 11  is a sectional view showing the water service box of the fourth embodiment of the present invention; 
         FIG. 12  is an exploded perspective view showing a water service box according to a fifth embodiment of the present invention; 
         FIG. 13  is a sectional view showing the water service box of the fifth embodiment of the present invention; 
         FIG. 14  is an exploded perspective view showing a water service box according to a sixth embodiment of the present invention; 
         FIG. 15  is a sectional view showing the water service box of the sixth embodiment of the present invention; 
         FIG. 16  is a sectional view showing an enlargement of a circled portion labeled ‘A’ in  FIG. 15 ; 
         FIG. 17  is a view corresponding to  FIG. 16 , but showing a modification of the sixth embodiment of the present invention; 
         FIG. 18  is an exploded perspective view showing important parts of the water service box of the sixth embodiment of the present invention; 
         FIG. 19  is a sectional view showing a water tap without a water service box, according to a seventh embodiment of the present invention; 
         FIG. 20  is a view showing an example of a water tap coupled to a cold and hot water piping system, according to an eighth embodiment of the present invention; 
         FIG. 21  is an exploded perspective view of a water service box according to a ninth embodiment of the present invention; 
         FIG. 22  is a view showing an arrangement of cold and hot water pipes according to a tenth embodiment of the present invention; 
         FIG. 23  is a sectional view showing the arrangement of the cold and hot water pipes of the tenth embodiment of the present invention; 
         FIG. 24  is an exploded perspective view of a boiler case assembly according to an eleventh embodiment of the present invention; 
         FIG. 25  is a view showing installation of the boiler case assembly of the eleventh embodiment of the present invention; 
         FIG. 26  is a sectional view showing installation of the boiler case assembly of the eleventh embodiment of the present invention; 
         FIG. 27  is an exploded perspective view of a boiler case assembly according to a twelfth embodiment of the present invention; 
         FIG. 28  is a view showing installation of the boiler case assembly of the twelfth embodiment of the present invention; 
         FIG. 29  is a sectional view showing installation of the boiler case assembly of the twelfth embodiment of the present invention; 
         FIG. 30  is a view showing installation of a boiler case assembly according a thirteenth embodiment of the present invention; 
         FIG. 31  is a sectional view showing installation of the boiler case assembly of the thirteenth embodiment of the present invention; 
         FIG. 32  is an exploded perspective view of the boiler case assembly according to the thirteenth embodiment of the present invention; and 
         FIG. 33  is a sectional view showing installation of the boiler case assembly of  FIG. 32 . 
     
    
    
     MODE FOR INVENTION 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. 
     As shown in  FIGS. 1 through 33 , a method of constructing a cold and hot water piping system according to the present invention includes the distributor setting step S 1 , the water service box disposing step S 2 , the water service setting step S 3  and the water tap coupling step S 4 . At step S 1 , double pipes  7 , which are cold and hot water pipes  5 , are coupled both to an outside water source  1  and to a distributor  3  such that cold water and hot water are supplied into the distributor  3  through the double pipes  7 . At step S 2 , water service boxes  9  are disposed at desired locations in rooms of a building, such as kitchens, bathrooms, living rooms and multi-use rooms. At step S 3 , the double pipes  7  extend from the distributor  3  to the water service boxes  9  in the rooms and are fastened to a plurality of iron reinforcing bars  11  using fastening wires  13 . At step S 4 , the double pipes  7  extend to a door  17  of a case  17  of each water service box  9 , and soft pipes  15 , provided in the double pipes  7 , protrude predetermined lengths from ends of the double pipes  7 . Furthermore, a water tap  21  is disposed at a position adjacent to the door  19  of the case  17  of each water service box  9  and is coupled to the soft pipes  15  provided in the double pipes  7 . 
     In a first embodiment, as shown in  FIGS. 4 and 5  with reference to  FIGS. 1 through 3 , cold and hot water pipes  5  lead to a distributor  3 , which is installed in a retaining wall or a masonry wall of each house. Other cold and hot water pipes  5  are connected between the distributor  3  and desired places. 
     Here, each of the cold and hot water pipes  5  has a shape such that a plastic cover pipe, which has a corrugated shape, covers a soft pipe  15 . The cold and hot water pipes  5  are embedded in a floor, extend in a vertical direction in a wall  23  at each desired place, and are connected to the water service box  9 , which is installed in the wall  23  at the desired place. 
     The cold and hot water pipes  5  are inserted into the water service box  9 , and they are coupled to cold and hot water connection pipes which extend to the outside from the water service box  9  through a T-shaped adaptor, so that cold water and hot water can be supplied to a bathtub, a washstand or a sink. 
     Furthermore, the cold water pipe of the water service box  9  may be connected to a toilet, or to a water tap provided on a balcony or, alternatively, it may be connected to a single port type water service box  9 ′ associated with the toilet or the water tap on the balcony. 
     In the water service disposing step S 2 , a water service box  9 , which includes a case  17 , having pipe ports  25 , and a door  19 , is integrally installed in the wall  23 . As such, because the water service box  9  is installed in the wall  23 , a good external appearance is ensured, and a separate space in a room is not required. 
     The water service box  9 , which includes the case  17  and the removable door  19 , has a rectangular parallelepiped shape. The pipe ports  25 , through which the cold and hot water pipes  5  pass, are formed through the upper and lower surfaces of the case  17 . A support unit, having a through hole, is provided on each corner of a front end of the case  17 . 
     Connection pipe ports  26  are formed through the door  19 , which is coupled to the case  17 , so that the cold and hot water connection pipes are fitted into the connection pipe ports. A rim part is perpendicularly provided on outside edges of the door  19 . Through holes are formed through the door  19  at positions corresponding to the through holes formed in the case  17 , so that the door  19  is securely fastened to the case  17  by locking units  26 ′, such as locking bolts, tightened into the through holes of the case  17  and the door  19 . 
     In this embodiment, the pipe ports  25 , through which the cold and hot water pipes  5  pass, are formed through the upper and lower surface of the case  17  of the water service box  9 . However, in the case of cold and hot water pipes  5  disposed in a horizontal direction, the pipe ports  25  may be formed through sidewalls of the case  17 . 
     Meanwhile, as shown in the drawings, the single port type water service box  9 ′ is smaller than the double port type water service box  9 . The single port water service box  9 ′ includes a case  17 , through which a pipe port  25  is formed so that only one of cold and hot water pipes passes through the pipe port  25 , and a door  19 , which is coupled to the case  17 . A connection pipe port  26  is formed through the door  19  so that one of cold and hot water connection pipes is fitted into the connection pipe port  26 . Furthermore, a rim part is perpendicularly provided on outside edges of the door  19 , in the same manner as that described for the double port type water service box  9 . When the door  19  is coupled to the case  17  by locking units  26 ′, the rim part of the door  19  surrounds a portion of the front end of the case  17 . Therefore, a good external appearance is ensured. 
     For example, cold water and hot water are supplied through the cold and hot water pipes  5  from the distributor  3  both to a water service box  9 , which is installed in the wall  23  adjacent to a bathtub, and to a water service box  9 , which is installed in the wall  23  adjacent to a washstand. Therefore, the cold water and hot water are discharged through cold and hot water connection pipes. Furthermore, in the case of a toilet which requires only cold water, only a cold water pipe may be coupled to a water service box  9 ′ associated with the toilet. 
     The water service box  9  may have the same thickness as the wall  23 . Alternatively, the thickness of the water service box  9  may be half of the thickness of the wall  23  or less. The water service box  9  is installed in the wall  23 , such that the outer surface of the water service box  9  is level with the surface of the wall  23 . Furthermore, the door  19  may be opened at need, for example, to inspect the cold and hot water pipes  5 . 
     Moreover, the orientation of the water service box  9  may be changed. For example, in order to ensure a good appearance of a wall surface in a bathroom, the door  19  of the water service box  9  may be oriented in the direction opposite the surface of the wall. Thereafter, wallpaper is applied to the surface of the wall. As such, the orientation of the water service box  9  may be changed, depending on surrounding conditions. 
     As described above, this embodiment of the present invention fundamentally prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after the iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, because each water service box  9 , which includes the case  17 , having the pipe ports  25 , and the door  19 , is integrally installed in the wall  23 , the present invention is convenient for the user, compared to the conventional art, in which a water service box is embedded in the floor of the building. Particularly, in the present invention, inspection of the cold and hot water pipes  5  for water leakage and repair work can be easily conducted without damage to the building. In detail, to repair a leaking pipe, opposite ends of an associated soft pipe  15  which are positioned in water service boxes  9  are disconnected from connection units. Thereafter, the soft pipe  15  is removed from the double pipe  7  through one of the water service boxes  9 , and the soft pipe  15  is then repaired. 
     A second embodiment of the present invention is shown in  FIGS. 6 and 7  with reference to  FIGS. 1 through 3 . In this embodiment, in the water service box setting step S 3 , double pipes  7  are fastened to a plurality of iron reinforcing bars  11  and, thereafter, a plurality of load support units  27  is disposed on the iron reinforcing bars  11  at positions adjacent to the double pipes  7  such that they are spaced apart from each other at regular intervals, thus reliably supporting the iron reinforcing bars  11 . Furthermore, in order to integrally fasten the double pipes  7  to the iron reinforcing bars  11 , fastening wires  13  are used at certain positions. In order to prevent the double pipes  7  fastened to the iron reinforcing bars  11  from being broken or bent, the load support units  27  are placed on the iron reinforcing bars  11  at positions adjacent to the double pipes  7 . When the double pipes  7  are embedded in the floor of the building, it is preferable that a gap of 10 cm or more be defined between the double pipes  7 . 
     Furthermore, when extending the double pipe  7  from the floor to a side wall, the double pipe  7  is preferably bent with a smooth curvature. 
     As described above, this embodiment of the present invention prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after the iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     When the double pipes  7 , which are the cold and hot water pipes  5 , are connected to the water service boxes  9 , the fastening wires  13  are used to reliably fasten the double pipes  7  to the iron reinforcing bars  11 . Furthermore, when bottom concrete (bc) is applied to basic concrete (fc), the load support units  27  are coupled to the iron reinforcing bars  11  at positions adjacent to the double pipes  7 , thus preventing the iron reinforcing bars  11  and the double pipes  7  from sagging. As such, as the double pipes  7  are securely protected and are prevented from sagging, the construction of the double pipes  7  can be reliably conducted. 
     A third embodiment of the present invention is shown in  FIGS. 8 and 9  with reference to  FIGS. 1 through 3 . In this embodiment, as shown in the drawings, the distributor  3  includes a case  17  which is installed in a wall  23  of the building and has a box shape that is open at a front end thereof, and a door  19  which is coupled to the open front end of the case  17 . A drain hole  29  is formed in the bottom of the distributor  3 . A drain water guide pipe  31  is coupled to the distributor  3  such that an upper end of the drain water guide pipe  31  communicates with the drain hole  29  of the distributor  3  and a lower end thereof is placed near a sewer outlet  33  of the building. Thus, even if water leakage occurs at joints of double pipes in the distributor  3 , because water can be discharged to the outside through the drain water guide pipe  31  and the sewer outlet  33 , the finish of the building is prevented from being damaged. 
     The case  17 , which is installed in the wall  23  and has a box shape, is openable using the door  19 . Portions of cold and hot water main pipes  34  are placed in the case  17 . The cold and hot water main pipes  34  are water supply pipes which are coupled to both a water gauge and a boiler. The cold and hot water main pipes  34  are branched into respective cold and hot water pipes  5 , which have double pipe structures, in the distributor  3 , thus supplying cold and hot water to desired places. 
     To couple the cold and hot water pipes  5  to the cold and hot water main pipes  34 , T-shaped valve sockets  41  are coupled to the cold and hot water main pipes  34 . Thereafter, the cold and hot water pipes  5  are coupled to the T-shaped valve sockets  41  using soft pipe connection nuts  39 . Feed rates of cold and hot water are adjusted using the T-shaped valve sockets  41 . 
     The cold and hot water pipes  5  are covered with the double pipes  7 , each having a corrugated shape and having a diameter appropriate for the cold or hot water pipe  5  to move in the double pipe  7 . Therefore, after the cold and hot water pipes  5  are embedded in the floor or the wall, they are reliably protected by the double pipes  7 . Particularly, because the cold and hot water pipes  5  are inserted into the double pipes  7  having the larger diameters, when it is desired to repair a cold or hot water pipe  5  or replace it with a new one, it is not necessary to demolish the wall  23  or the floor, in which the cold and hot water pipes  5  are embedded. In detail, after the soft pipe connection nuts  39  are released from the opposite ends of the cold or hot water pipe  5 , the cold or hot water pipe  5  is removed from the double pipe  7  by pulling it in one direction. Subsequently, the cold or hot water pipe  5  is repaired or replaced with a new one. 
     To install a repaired or new cold or hot water pipe  5 , one end of the cold or hot water pipe  5  is inserted into one end of the double pipe  7 , and the cold or hot water pipe  5  is forcibly pushed into the double pipe  7 . Then, the cold or hot water pipe  5  is moved along the double pipe  7  and reaches the other end of the double pipe  7 . 
     Furthermore, the drain water guide pipe  31 , which is coupled to the drain hole  29  formed through the bottom of the case  17 , also has a double pipe structure in the same manner as that described for the cold and hot water pipes  5 . 
     Cold water and hot water are supplied from the cold and hot water main pipes  34  to desired places through the cold and hot water pipes  5 . Even if water leakage occurs in the cold or hot water pipe  5  while in use, leaking water is drawn into the distributor through the double pipe  7  and is discharged to the outside through the drain water guide pipe  31 . That is, because the distributor  3  is disposed at a position lower than water taps  21 , leaking water is drawn (moves backwards) into the distributor  3  through the double pipe  7  due to the height difference, and is then discharged to the outside. 
     Furthermore, even if water leaks at joints of the cold and hot water pipes  5  in the distributor  3 , the leaking water can be discharged to the outside through the drain hole  29  and the drain water guide pipe  31 . 
     The double pipes  7  which cover the cold and hot water pipes  5  are coupled to the case  17  such that the ends of the pipes  7  protrude to positions higher than the bottom of the case  17 . As such, thanks to the double pipes  7  constructed such that the ends of the double pipes  7  protrude from the bottom of the case  17 , even if water, leaked from a cold or hot water pipe  5  while in use, is drawn into the distributor  3 , the water is prevented from entering other cold and hot water pipes  5  which are operating normally. 
     As described above, this embodiment of the present invention fundamentally prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after the iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     As well, water, leaked in the distributor  3 , is discharged to the sewer outlet  33  of the building through the drain water guide pipe  31 . In addition, when it is desired to repair the cold or hot water pipe  5  or replace it with a new one due to water leakage, freezing or deterioration of the pipe, the present invention makes it possible to easily conduct the pipe repair or replacement without demolishing the wall  23  or the floor. In other words, because a valve socket seat  35 , a double pipe connection nut  37 , the soft pipe connection nut  39  and the valve socket  41  are separably assembled together, pipe repair or replacement can be easily conducted. 
     A fourth embodiment of the present invention is shown in  FIGS. 10 and 11  with reference to  FIGS. 1 through 5 . In this embodiment, as shown in the drawings, valve socket seats  35  are fitted into a door  19  of a water service box  9 . Ends of double pipes  7  which extend into a case  17  of the water service box  9  are coupled to valve socket seats  35  using double pipe connection nuts  37 . Ends of soft pipes  15 , provided in the double pipes  7 , are coupled to valve sockets  41 , which are fitted into the valve socket seats  35 , using soft pipe connection nuts  39 . Thereafter, water taps  21  are coupled to the valve sockets  41 . The valve socket seats  35 , which are fitted into the door  19 , serve to couple the water taps  21  to the embedded-type openable water service box  9 . Each valve socket seat  35  is coupled to the end of each double pipe  7 , which extends into the case  17  of the embedded-type openable water service box  9 , using the double pipe connection nut  37 . 
     Each water tap  21  and a circular connection cover  43  of the water tap  21  are coupled to each valve socket  41 , which protrudes from the water service box  9  to the outside and is coupled to the end of each soft pipe  15  of each double pipe  7  using the soft pipe connection nut  39 . 
     After the assembling process of the water service box  9  has been completed, finishing material, such as mortar, or finishing substances, such as tiles, are attached both to a wall  23 , in which the water service box  9  is embedded, and to the door  19  of the water service box  9 . Here, the finishing material or substance has a thickness appropriate to cover the valve socket  41 . As such, the soft pipes  15 , which are the cold and hot water pipes  5  and are inserted into the double pipes  7  serving as cover pipes, are coupled to the valve sockets  41 , which are coupled to the water taps  21  using the soft pipe connection nuts  39 . Cold water and hot water, which are supplied through the soft pipes  15 , are discharged to the outside through the water taps  21 . 
     As described above, this embodiment of the present invention fundamentally prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, because each water service box  9 , which includes the case  17  and the door  19 , is integrally installed in the wall  23 , this embodiment of the present invention is convenient for the user, compared to the conventional art, in which a water service box is embedded in the floor of the building. Particularly, in this embodiment of the present invention, water leakage inspection of the cold and hot water pipes  5  and repair work can be easily conducted without damage to the building. That is, to repair a leaking pipe, opposite ends of an associated soft pipe  15  which are positioned in water service boxes  9  are disassembled from connection units. Thereafter, the soft pipe  15  is removed from the double pipe  7  through one of the water service boxes  9 , and the soft pipe  15  is then repaired. 
     A fifth embodiment of the present invention is shown in  FIGS. 12 and 13  with reference to  FIGS. 1 through 5 . In this embodiment, as shown in the drawings, valve socket seats  35  are fitted into a door  19  of a water service box  9 . An end of each double pipe  7  merely extends to a predetermined position adjacent to a pipe port in the water service box  9  and is fastened to the water service box  9 . Ends of soft pipes  15 , provided in the double pipes  7 , are coupled to valve sockets  41 , which are fitted into the valve socket seat  35 , using soft pipe connection nuts  39 . Thereafter, water taps  21  are coupled to the valve sockets  41 . As such, in this embodiment, the double pipes  7  merely extend to the pipe ports of the water service box  9 , so that the soft pipes  15  in the water service box  9  are in an open state and are directly coupled to the valve sockets  41 , which are coupled to water taps  21 , using the soft pipe connection nuts  39 . 
     As described above, this embodiment of the present invention fundamentally prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, because each water service box  9 , which includes the case  17  and the door  19 , is integrally installed in the wall  23 , this embodiment of the present invention is convenient for the user, compared to the conventional art, in which a water service box is embedded in the floor of the building. Particularly, in this embodiment of the present invention, inspection of the cold and hot water pipes  5  for water leakage and repair work can be easily conducted without damage to the building. That is, to repair a leaking pipe, opposite ends of an associated soft pipe  15  which are positioned in water service boxes  9  are disconnected from connection units. Thereafter, the soft pipe  15  is removed from the double pipe  7  through one of the water service boxes  9 , and the soft pipe  15  is then repaired. 
     A sixth embodiment of the present invention is shown in  FIGS. 14 through 18  with reference to  FIGS. 1 through 5 . In this embodiment, as shown in the drawings, first ends of flexible hoses  45 , which couple double pipes  7  to water taps  21 , are coupled to soft pipes  15 , placed in the double pipes  7 , using first reducing sockets  47  inserted in pipe ports of the water service box  9 . Furthermore, second ends of the flexible hoses  45  are coupled to the water taps  21 . Meanwhile, in this embodiment, a plurality of frictional protrusions  49  is provided on a surface of a door  19  of the water service box  9 . A repair opening  51  is formed through the door  19 . A rim part  53  is provided on an inner edge of the door  19  defining the repair opening  51 , so that an openable plate  55  is removably fitted into the rim part  53  of the door  19 . Second reducing sockets  47 , into which connection pipes  57  of the water taps  21  are inserted, are fitted into socket insert holes  59 , which are formed at predetermined positions through the openable plate  55 . The second reducing sockets  47  are also coupled to the second ends of the flexible hoses  45 . The door  19 , which is openably coupled to the case  17  of the water service box  9 , is made of synthetic resin or metal. The frictional protrusions  49  are provided on the outer surface of the door  19  such that mortar or tiles may be applied to the outer surface of the door  19 . The repair opening  51 , having an appropriate size, is formed through the door  19 . 
     The repair opening  51  is formed by cutting a portion of the door  19  and by protruding the rim part  53  from the inner edge of the door  19 . Furthermore, the repair opening  51  may have an elliptical shape, a rectangular shape, a hexagonal shape, etc., that is, it is not limited to any particular shape. However, when considering external appearance and practicality, it is preferable that the repair opening  51  have a shape that harmonizes with an interior design. 
     The openable plate  55 , which is slightly larger than the repair opening  51  so that the edge of the repair opening  51  can be covered by the openable plate  55 , is attached to the repair opening  51  of the door  19  so as to close the repair opening  51 . The socket insert holes  59  are formed at predetermined positions through the openable plate  55 , so that the second reducing sockets  47  are inserted into respective socket insert holes  59 . The second reducing sockets  47  are fitted into the respective socket insert holes  59  of the openable plate  55  and are securely coupled to respective connection units  63  of the flexible hoses  45  in the case  17  using locking nuts  61 . 
     Thereafter, the openable plate  55  is placed on the rim part  53  of the repair opening  51  of the door  19  such that a locking hole  65 , formed at a lower position through the openable plate  55 , corresponds to a locking hole  65  formed at a lower position in the rim part  53 . Subsequently, the openable plate  55  is fastened to the rim part  53  by a locking unit  67  inserted into the locking holes  65 . After elliptical slots  69 , formed at left and right upper positions through the openable plate  55 , are aligned with respective locking holes  65 , which are formed at upper positions in the rim part  53 , a posture of the openable plate  55  is precisely adjusted using both the elliptical slots  69  of the openable plate  55  and the locking holes  65  of the rim part  53 . Thereafter, the openable plate  55  is securely fastened to the rim part  53  using locking units  67 . 
     That is, because the slots  69 , formed at the left and right upper positions through the openable plate  55 , is elliptical rather than circular, the position of the openable plate  55  can be precisely adjusted by moving it to the left or right in the state in which the locking unit  67  is inserted into the locking holes  65  formed at the lower positions both in the rim part  53  and in the openable plate  55 . Thereafter, the locking units  67  are tightened into the elliptical slots  69  of the openable plate  55  and the locking holes  65  of the rim part  53 . For a good appearance, finishing caps  71  are fitted into the locking holes  65 . 
     As such, after the openable plate  55  is fastened to the door  19 , the connection pipes  57 , each having a connection cover  73 , are coupled to respective second reducing sockets  47 . The water taps  21  are coupled to the connection pipes  57 , thus completing the process of assembling the water service box  9  to which the water taps  21  are coupled. 
     The outlet ends of the flexible hoses  45 , that is, the second ends of the flexible hoses  45 , are fastened to the openable plate  55  and are coupled to the respective water taps  21 , through which cold water and hot water are finally discharged. Furthermore, the openable plate  55  is fastened to the rim part  53  of the repair part  51  of the door  19 . Actually, when constructing the water service box  9 , mortar is applied to the front surface of the door  19  after the door  19  is coupled to the case  17  using locking units  67 . Thereafter, tiles are attached to the mortar. The openable plate  55  is then coupled to the rim part  53 , thus finishing the construction process. 
     Because a predetermined numbers of frictional protrusions  49 , each having an appropriate size, are provided on the front surface of the door  19 , mortar can be securely applied to the front surface of the door  19  without moving, that is, without slipping down. 
     Meanwhile, in the process of finishing the water service box  9 , mortar may be applied to the surface of the water service box  9  alone, without tiles. In this case, it is preferable that the finishing process be conducted after both the door  19  and the openable plate  55  are completely assembled with the case  17 . 
     The end of the connection unit  63  of each flexible hose  45  is fitted into each second reducing socket  47  and is securely coupled to the second reducing socket  47  using the locking nut  61 . Each second reducing socket  47  is fastened to the openable plate  55  by the locking nuts  61  inside the rim part  53 . 
     Furthermore, a packing  75 , made of material such as rubber, is provided on contact surfaces between the openable plate  55  and the rim part  53  of the door  19 , thus increasing the coupling force of the openable plate  55  to the rim part  53 . 
     As well, to ensure superior mobility and bending ability of each flexible hose  45 , a coil spring  77  is provided in each flexible hose  45  or is fitted over each flexible hose  45 . Furthermore, this coil spring  77  prevents the flexible hose  45  from breaking. 
     In order to connect the second reducing sockets  47  to the flexible hoses  45 , a small diameter part and a large diameter part of each reducing socket  47  are inserted into each socket insert hole  59  of the openable plate  55 , such that a stop protrusion  81 , which is provided adjacent to the socket insert hole  59  on the openable plate  55 , is inserted into a stop notch  79  formed in the second reducing socket  47 . Thereafter, a locking nut  61  is tightened to the large diameter part of the second reducing socket  47  on a rear surface of the openable plate  55 . Subsequently, while the end of the connection unit  63  of the flexible hose  45  is brought into contact with the small diameter part of the second reducing socket  47 , another locking nut  61 , which is fitted over the flexible hose  45 , is tightened to the small diameter part of the second reducing socket  47 . 
     Then, the flexible hose  45  is securely coupled to the second reducing socket  47 , which is fitted into the socket insert hole  59  of the openable plate  55 . Particularly, because the stop protrusion  81  of the openable plate  55  is inserted into the stop notch  79  of the second reducing socket  47 , even when a connection pipe  57  of a water tap  21  is coupled to the second reducing socket  47 , the second reducing socket  47  is prevented from undesirably moving. Thereby, reliable coupling can be realized. 
     As described above, this embodiment of the present invention fundamentally prevents the cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, because each water service box  9 , which includes the case  17  and the door  19 , is integrally installed in the wall  23 , this embodiment of the present invention is convenient for the user, compared to the conventional art, in which a water service box is embedded in the floor of the building. Particularly, in this embodiment of the present invention, inspection of the cold and hot water pipes  5  for water leakage and repair work can be easily conducted without damage to the building. That is, to repair a leaking pipe, opposite ends of an associated soft pipe  15  which are positioned in water service boxes  9  are disconnected from connection units. Thereafter, the soft pipe  15  is removed from the double pipe  7  through one of the water service boxes  9 , and the soft pipe  15  is then repaired. 
     Furthermore, the wall embedded type water service box  9  includes the case  17 , which has therein the flexible hoses  45  that couple the soft pipes  15  and the water taps  21  to each other, and the door  19 , which is removably coupled to the case  17 . The repair hole  51  is formed through the door  19 . The openable plate  55 , to which the reducing sockets  47  coupled to the respective flexible hoses  45  are mounted, is removably coupled to the door  19 . Therefore, when some operation in the water service box  9  is required, it is not necessary to open the entire door  19 , but only the openable plate  55  needs to opened, thus being convenient for the user. 
     Furthermore, at need, the user may put his/her hand into the repair hole  51  formed in the door  19  and conduct the operation while directly checking the internal situation of the water service box  9 . To repair the flexible hose  45  or to replace the soft pipe  15 , which is the cold or hot water pipe  5  placed in the double pipe  7 , with a new one, the user releases the joint of the double pipe  7  which is placed in the distributor  3 . Subsequently, the user puts his/her hand into the repair hole  51  and pulls the flexible hose  45  outwards. Then, it is easily extracted to the outside from the water service box  9 . As such, the present invention makes it possible for a user to easily conduct the repair or replacement process. 
     As well, because the coil spring  77  is provided in each flexible hose  45  or is fitted over each flexible hose  45 , the flexible hose  45  is prevented from being damaged. 
     A seventh embodiment of the present invention is shown in  FIG. 19  with reference to  FIGS. 1 through 3 . As shown in the drawings, this embodiment shows a case having no water service box. An elbow  83  is mounted to a front end of each double pipe  7 . A support plate  85 , into which a valve socket seat  35  coupled to a front end of the elbow  83  is fitted, is fastened to a wall  23 . After a front end of a soft pipe  15  is coupled to a valve socket  41  using a soft pipe connection nut  39 , the valve socket  41  is fitted into the valve socket seat  35 . Thereafter, a water tap  15  is coupled to the valve socket  41 . The double pipe  7 , in which the soft pipe  15  is placed, extends from a distributor  3  to the elbow  83 , installed in a bathroom, through floors of rooms of a building. 
     A rear end of the elbow  83  is coupled to the double pipe  7  using a double pipe connection nut  37 . The front end of the elbow  83  is coupled to the rear portion of the valve socket seat  35 . The support plate  85  is typically made of steel. One or two holes are formed at a central position (a single port type) or left and right sides (a double port type) through the support plate  85 , so that the valve socket seat  35  is fitted into each hole and is fastened to the support plate  85  using locking units  67 . The support plate  85  is fastened to the wall  23  using locking units  67  tightened into through holes, which are formed at corners through the support plate  85 . 
     Furthermore, the soft pipe  15  of the double pipe  7  passes through the valve socket seat  35  and is coupled at the front end thereof to a rear end of the valve socket  41  using the soft pipe connection nut  39 . As such, in the state in which the valve socket  41  is coupled to the front end of the soft pipe  15  using the soft pipe connection nut  39 , the valve socket  41  is inserted into and fastened to the valve socket seat  35  by tightening the locking units  67  into the through holes, which are formed at outer positions through both the valve socket  41  and the valve socket seat  35 . The water tap  21  is fitted into the valve socket  41 , so that cold water or hot water can be discharged from the soft pipe  15  to the outside through the water tap  21 . 
     Therefore, finishing material, such as tiles or mortar, is applied both to the outer surface of the support plate  85  and to the surface of the wall  23  in which the soft pipe  15  is embedded. Here, the finishing material or substance has a thickness suitable for covering the valve socket  41 . It is preferable that a circular connection cover  43  be provided between the water tap  21  and the valve socket  41  to ensure safety and a superior external appearance. 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     As such, no water service box type water tap connection system is comprised in this embodiment. Unlike the case using a water service box  9 , the water tap  21  is directly installed in the wall  23  by the elbow  83  and the support plate  85  without a water service box. Thus, the water tap connection system is simplified, so that work can be performed conveniently. 
     An eighth embodiment of the present invention is shown in  FIG. 20  with reference to  FIGS. 1 through 3 . As shown in the drawings, to prevent a pipe from freezing in the winter, a foam polyethylene heat insulation tube  87  is provided around a portion of a double pipe located in a floor and a wall at a position adjacent to the outside of a building. The foam polyethylene heat insulation tube  87  is embedded in a junction between the floor and the wall and, thereafter, the double pipe  7  is inserted into the foam polyethylene heat insulation tube  87 . 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     As such, in this embodiment, the foam polyethylene heat insulation tube  87  is provided around the outer surface of the double pipe  7 . Furthermore, the foam polyethylene heat insulation tube  87  is installed at the junction between the floor and the wall, where the double pipe  7  is bent. Thus, the foam polyethylene heat insulation tube  87  guides the double pipe  7  and prevents the pipe, located in the double pipe  7 , from freezing and bursting in the winter. 
     A ninth embodiment of the present invention is shown in  FIG. 21  with reference to  FIGS. 1 through 5 . As shown in the drawings, to prevent cold and hot water pipes  5  from freezing in the winter, heating wires  89  are provided at particular position on the cold and hot water pipes  5 . A pipe freezing prevention switch (not shown) is provided in a household distribution box which is disposed around the outside water source  1  but is not shown in the drawings. A temperature sensor, which is not shown in the drawings, is provided in a water gauge box (not shown), which is disposed ahead of the distributor  3 . A plug unit  93  is removably coupled to a box-built-in type electric plug socket  91 , which is provided under the upper surface of each water service box  9  that is located at a side of the building at which there is a probability of a pipe freezing. The heating wires  89 , which are connected to the plug unit  93 , are inserted into the respective double pipes  7 . 
     The household distribution box serves to supply or interrupt power to rooms. The pipe freezing prevention switch is provided adjacent to several power supply switches in the household distribution box. The power on/off operation is performed through a power supply cable  95 . The temperature sensor controls heat generation of the heating wires  89 , for example, by automatically interrupting power when heat generation is no longer required due to the increased temperature of a room. 
     The water service box  9  includes a door  19  which has pipe ports through which cold and hot water soft pipes  15 , which are provided in the double pipes  7 , extend to the outside. When coupling the door  19  to the water service box  9 , a packing  75 , which is made of material such as rubber, is interposed, thus increasing the reliability thereof. A coupling support unit  97  is provided on the outer surface of each corner of a front end of the water service box  9 , such that the door  19  can be easily coupled to the water service box  9  using locking bolts. 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, because each water service box  9 , which includes the case  17 , in which the pipe ports  25  are formed, and the door  19 , is integrally installed in the wall  23 , this embodiment of the present invention is convenient for the user, compared to the conventional art, in which a water service box is embedded in the floor of the building. Particularly, in this embodiment of the present invention, inspection of the cold and hot water pipes  5  for water leakage and repair work can be easily conducted without damage to the building. That is, to repair a leaking pipe, opposite ends of an associated soft pipe  15  which are positioned in water service boxes  9  are disconnected from connection units. Thereafter, the soft pipe  15  is removed from the double pipe  7  through one of the water service boxes  9 , and the soft pipe  15  is then repaired. 
     The operation of the heating wires that prevents the soft pipes  15  from freezing is as follows. In the winter, when the temperature of the rooms falls below the freezing point, power is supplied to the electric plug socket  89 , which is provided under the upper surface of the water service box  9 , through the electric cable  95 . The power is applied from the electric plug socket  89  to the plug unit  93  connected to the heating wires  89 , thus inducing heat generation in the heating wires  89 . Thereby, the heating wires  89 , which are inserted in the double pipes  7 , prevent the soft pipes from freezing. If the temperature of the rooms rises above the freezing point, the temperature sensor provided in the water gauge box detects this and interrupts the power. As such, this embodiment can efficiently and stably protect the soft pipes  15 . 
     A tenth embodiment of the present invention is shown in  FIGS. 22 and 23  with reference to  FIGS. 1 through 3 . As shown in the drawings, a rectangular parallelepiped support box  99  is embedded in a wall of a room and is provided around lower portions of cold and hot water pipes  5 , which are installed in the wall. A heating pipe  101  is installed in the floor of the room such that a portion of the heating pipe  101  is placed adjacent to portions of the cold and hot water pipes  5  which are placed in the support box  99 . 
     The support box  99 , which is open at an end thereof, is installed on the lower portions of the cold and hot water pipes  5 . At this time, the support box  99  is first installed such that a lower surface  103  of the support box  99  is on the same plane as a lower side of the heating pipe  101  such that the heating pipe  101  is maintained in a state of being horizontal. Thereafter, the heating pipe  101  is installed in the floor of the room such that the portion of the heating pipe  101  is disposed adjacent to the portions of the cold and hot water pipes  5  which are placed in the support box  99 . 
     Meanwhile, the support box  99 , which is installed in the floor or the wall, may be empty or, alternatively, may be filled with concrete. 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     In addition, this embodiment has a structure such that the portions of the cold and hot water pipes  5  are close to the portion of the heating pipe  101 . Therefore, because heat is conducted from the heating pipe  101 , which is supplied with hot water from a boiler, even if severe cold weather persists, there is no probability of a pipe freezing. 
     Furthermore, the portion of the heating pipe  101  is placed at a position adjacent to the portions of the cold and hot water pipes  5  such that the heating pipe  101  is maintained in a state of being horizontal. Accordingly, this does not interfere with hot water circulation in the heating pipe  101 . 
     Although a laundry room, in which a laundry machine is disposed, has been explained as one example of this embodiment, this embodiment may be applied to piping between a water gauge and the distributor or to piping that extends to a balcony. That is, the support box  99  is installed at a predetermined position, and a portion of the heating pipe  101  is placed adjacent to portions of associated pipes, thus preventing the pipes from freezing using heat transferred from hot water in the heating pipe  101 . 
     An eleventh embodiment of the present invention is shown in  FIGS. 24 and 26  with reference to  FIGS. 1 through 3 . As shown in the drawings, this embodiment is applied to a heating apparatus which is used in a detached house and heats water and circulates the heated water through a heating pipe  101  of cold and hot water pipes  5 . In detail, a boiler holder  109  is provided on a rear wall of a case  17 . A pipe insert hole  111  is formed through a lower surface of the case  17 . A bracket  113  is provided on the outer surface of each corner of a case cover  105 . Both a discharge pipe insert hole  123  and an intake pipe insert hole  115  are formed through an upper end of the case cover  105 . A door  19 , which has vent holes  117  and an opening and closing button  119  therein, is provided below the discharge pipe insert hole  123  and the intake pipe insert hole  115 . The case cover  105  is integrally coupled to the case  17 . 
     The case  17  has a size sufficient to receive a boiler  121 . The case  17  includes the boiler holder  109  on the rear wall thereof and the pipe insert hole  111  formed through the lower surface thereof. The boiler holder  109  comprises a plurality of boiler holders  109  which are attached to the rear wall of the case  17 . Each boiler holder  109  has a holding hole  65  therein. Thus, the boiler holders  109  securely support the boiler  121 . 
     Furthermore, the pipe insert hole  111  comprises a plurality of pipe insert holes  111 , which are formed through the lower surface of the case  17 . Cold and hot water pipes  5 , which are coupled to the boiler  121 , extend outside the case  17  through the pipe insert holes  111 . 
     Meanwhile, the brackets  113 , each having a slot  69  therein, are provided on the outer surfaces of the corner of the case cover  105  corresponding to the case  17 . Thus, the case cover  105  is coupled to the case  17  using locking bolts to be tightened into the slots  69 . 
     Furthermore, the discharge pipe insert hole  123  and the intake pipe insert hole  115  are formed through the upper end of the case cover  105 , so that a discharge pipe and an intake pipe, which communicate with the boiler  121 , extend outside the case  17  through the discharge pipe insert hole  123  and the intake pipe insert hole  115 , respectively. The door  19 , which has the vent holes  117  and a locking device  125 , is coupled to the case cover  105  below the discharge pipe insert hole  123  and the intake pipe insert hole  115 , such that a boiler case assembly  107  is openable. 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by a distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     Furthermore, in order to install the boiler case assembly  107  in the wall, the case  17  is installed in the wall  23  to a depth of approximately ⅔ of the thickness thereof. The boiler  121  is installed in the case  17  and, thereafter, the case  17  is covered with the case cover  105 . Subsequently, the locking units  67  are tightened into the wall  23  after passing through the brackets  113 , thus completing the installation process. 
     Meanwhile, pipes  127  are coupled to the boiler  121  through the lower surface of the case  17 . Each pipe  127  has a double pipe structure such that a soft pipe  15  is surrounded by a double pipe  7 , which is a cover pipe having a corrugated shape. The double pipe  7  is embedded in the wall  23  and extends to desired places. 
     Furthermore, a protective pipe  133 , having a plurality of intake holes  131 , is provided at a predetermined position on the discharge pipe  129 , which is coupled to the boiler  121 . The intake pipe  135  is coupled to the protective pipe  133 . Thus, air can be preheated by the discharge pipe  129  before being drawn into the boiler  121  through the intake holes  131 , thus increasing thermal efficiency of the boiler. 
     As well, the door  19 , which has the vent holes  117  and the opening and closing button  119 , is coupled to the open front end of the case cover  105 . Therefore, the locking device  125  is released by pushing the opening and closing button  119 , thus allowing the user to observe the interior conditions and repair the boiler  121 . 
     As such, the case  17  is installed in the wall  23  to a depth of approximately ⅔ of the thickness thereof and, the boiler  121  is thereafter installed in the case  17 . Subsequently, the case cover  105  is integrally coupled to the case  17 . Therefore, the space required to install the boiler  121 , having a relatively large volume, can be reduced. In addition, the boiler  121  can be reliably protected from bad weather. 
     A twelfth embodiment of the present invention is shown in  FIGS. 27 and 29  with reference to  FIGS. 1 through 3  and  FIGS. 24 through 26 . As shown in the drawings, in this embodiment, a case  17 , in which a boiler  121  is received, is placed at a predetermined position. A door  19 , which has vent holes  117  and a locking device  125 , is coupled to a front end of the case  17 . Two boiler holders  109  are provided at upper and medial positions on a rear wall of the case  17 . An opening  137  is formed at a lower position through the rear wall of the case  17 . Both a discharge pipe insert hole  123  and an intake pipe insert hole  115  are formed through an upper surface of the case  17 . A bracket  113  is provided on the outer surface of each corner of a boiler case assembly  107 , in which the boiler  121  is received. 
     Furthermore, a wall chamber  139  is formed in a wall at a position corresponding to the opening  137  of the case  17 . 
     The case  17  comprised in the boiler case assembly  107  has a size sufficient to receive a boiler  121 . The door  19 , which includes the vent holes  117  to ensure superior ventilation and the locking device  125  that locks the door  19  to the case  17 , is coupled to the front end of the case  17 , such that the boiler case assembly  107  is openable. 
     Meanwhile, a holding hole  65  is formed through each of the boiler holders  109 , which are attached at upper and medial positions to the inner surface of the rear wall of the case  17 . Thus, the boiler holders  109  securely support the boiler  121 . The opening  137 , having a relatively large size, is formed through the rear wall of the case  17  below the boiler holders  109 , so that, when the boiler  121  is installed in the boiler case assembly  107  mounted to the wall, various pipes, which are embedded in the wall  23 , are connected to the boiler  121  through the opening  137 . 
     Furthermore, the discharge pipe insert hole  123  and the intake pipe insert hole  115  are formed through the upper surface of the boiler case assembly  107 , so that a discharge pipe  129  and an intake pipe  135  which communicate with the boiler  121  extend outside the case  17  through the discharge pipe insert hole  123  and the intake pipe insert hole  115 , respectively. 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     To mount the boiler case assembly  107  to the wall  23  at a predetermined height, the boiler case assembly  107  is placed such that the opening  137  of the boiler case assembly  107  corresponds to the wall chamber  139  formed in the wall  23 . Thereafter, the boiler case assembly  107  is fastened to the wall  23  by tightening the locking units  67  into the slots  69  of the brackets  113  provided on the corners of the boiler case assembly  107 . 
     Meanwhile, pipes  127  are coupled to the boiler  121  through the lower end of the case  17 . Each pipe  127  has a double pipe structure such that a soft pipe  15  is surrounded by a double pipe  7 , which is a cover pipe having a corrugated shape. The double pipe  7  is embedded in the walls  23  and extends to desired places. 
     Furthermore, a protective pipe  133  having a plurality of intake holes  131  is provided at a predetermined position on the discharge pipe  129 , which is coupled to the boiler  121 . The intake pipe  135  is coupled to the protective pipe  133 . Thus, air can be preheated by the discharge pipe  129  before being drawn into the boiler  121  through the intake holes  131 , thus increasing thermal efficiency of the boiler. 
     As well, the door  19 , which has the vent holes  117  and the opening and closing button  119 , is coupled to the open front end of the boiler case assembly  107 . Therefore, the locking device  125  is released by pushing the opening and closing button  119 , thus allowing the user to observe the condition of the boiler  121  and repair the boiler  121 . 
     As such, the opening  137  is formed through the rear wall of the case  17  constituting the boiler case assembly  107 , so that, when the boiler  121  is installed in the boiler case assembly  107 , the pipes  127 , which are coupled to the boiler  121 , are inserted into the wall chamber  139  formed in the wall  23 , and are embedded in the wall  23 . Therefore, the pipes  127  are prevented from being exposed outside, thus ensuring a good external appearance. As well, the present invention solves problems of the prior arts in that, because a boiler is installed outdoors, the heat of sun, rain or wind may have a bad influence on the boiler. In addition, the present invention can increase spatial efficiency and reliably protect the boiler  121 . 
     A thirteenth embodiment of the present invention is shown in  FIGS. 30 and 33  with reference to  FIGS. 1 through 3  and  FIGS. 24 through 29 . As shown in the drawings, in this embodiment, a piping box  141 , which has a size appropriate to conduct piping work, is integrated with a boiler case assembly  107  below a boiler  121 . A wall chamber  139  is formed in a wall  23  at a position corresponding to the piping box  141 . A double pipe  7 , which has an inner diameter larger than an outer diameter of a hot water pipe  127 , is embedded from a lower end of the wall chamber  139  to a distributor, so that the hot water pipe  127  is arranged through the double pipe  7 . As such, because the pipe  127  is connected to the boiler  121  through the wall chamber  139  and the piping box  141 , the pipe  127  is prevented from being exposed outside. 
     Furthermore, a door  19  is provided on a front end of the piping box  141 . A cover plate  143  is attached to a lower end of the piping box  141 . A pipe insert opening  111  is formed through a rear wall of the piping box  141 . The piping box  141  is integrated with the boiler case assembly  107  and has an appropriate size such that the user can put a tool or his/her hands into the piping box  141  to perform piping work. The door  19  is provided on the front end of the piping box  141 , and the cover plate  143 , which is openable at need, is attached to the lower end of the piping box  141 . 
     To arrange the pipe coupled to the boiler  121 , an end of the pipe  127  is inserted into the double pipe  7  and, thereafter, the pipe  127  is forcibly pushed into the double pipe  7  until the end of the pipe  127  reaches a distributor. 
     Furthermore, the piping box  141  may be removably mounted to the boiler case assembly  107 . In this case, the piping box  141  is fastened to the boiler case assembly  107  using a plurality of coupling members  145 . 
     As described above, this embodiment of the present invention fundamentally prevents cold and hot water pipes from being damaged. As well, even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. In a construction site, to construct the cold and hot water pipes  5 , after iron reinforcing bars  11  are arranged to support cold and hot water pipes  5 , the cold and hot water pipes  5  are fastened to the iron reinforcing bars  11 . Each of the cold and hot water pipes  5  has a double pipe structure. Furthermore, after water service boxes  9  have been installed at desired places, the cold and hot water pipes  5  are branched by the distributor  3 , and the branched cold and hot water pipes  5  are coupled to the respective water service boxes  9 . 
     When installing the boiler  121 , an end of the hot water pipe  127  is inserted and forcibly pushed into the double pipe  7  until the first end of the pipe  127  reaches the distributor  3 . Thereafter, the other end of the pipe  127  is inserted into the piping box  141 , which is provided below the boiler  121 , through the wall chamber  139 , and is then connected to the boiler  121 . 
     At this time, to perform the piping process conveniently, the door  19  of the piping box  141  or the cover plate  143 , provided under the lower end of the piping box  141 , may be opened. After the piping process has been completed, the door  19  or the cover plate  143  is closed. Then, the process of installing the boiler  121  is completed. 
     As such, in the boiler installation process of this embodiment, the piping work is easily conducted. As well, because the pipe  127  is not exposed to the outside, a superior external appearance is ensured. 
     Meanwhile, in the case that the piping box  141  is removably coupled to the boiler case assembly  107 , during an installation process of the boiler  121 , the piping box  141  is fastened to the lower end of the boiler case assembly  107  using the locking members  145 . Of course, this case also makes it possible for the piping work to be easily performed and ensures a superior external appearance. 
     INDUSTRIAL APPLICABILITY 
     As described above, the present invention provides a method of constructing a cold and hot water piping system in which cold and hot water pipes, each having a double pipe structure, are connected to and branched by a distributor and, thereafter, the cold and hot water pipes, branched by the distributor, are connected to water service boxes, disposed at desired places, after being fastened to iron reinforcing bars such that the cold and hot water pipes are spaced apart from each other by a predetermined distance, so that the cold and hot water pipes are prevented from being damaged, and even if water leakage occurs, the present invention makes it possible for a user to rapidly respond to this situation. 
     As well, when constructing the cold and hot water pipes, load support units are disposed under the iron reinforcing bars at positions adjacent to the double pipes such that the load support units are spaced apart from each other at regular intervals, thus efficiently preventing the iron reinforcing bars and the double pipes from being undesirably deformed. 
     Furthermore, because the cold and hot water pipes, which respectively supply cold water and hot water to desired places, have double pipe structures, even if water leaks from the pipe, leaking water enters the distributor and is discharged to the outside. In addition, even if water leakage occurs at joints in the distributor, leaking water is also discharged from the distributor to the outside. Therefore, the present invention prevents leaking water from soaking through a wall or floor of a building. 
     As well, in the water service box, a first end of a flexible hose is coupled to a soft pipe, placed in each double pipe, using a first reducing socket, and a second end of the flexible hose is coupled to a water tap. A door of the water service box has a plurality of frictional protrusions on the outer surface thereof and a repair opening therein. A rim part is provided on an inner edge of the door which defines the repair opening, so that an openable plate may be removably fitted into the rim part of the door. A second reducing socket, into which a connection pipe of the water tap is inserted, is fitted into a socket insert hole, which is formed at a predetermined position through the openable plate. The second reducing socket is also coupled to the second end of the flexible hose. Therefore, the present invention provides convenience in assembling and disassembling the water service box, compared to a conventional water service box in which only pipes are installed. Particularly, the user can directly inspect the inner condition of the water service box by putting his/her hands put into the water service box through the repair opening. Thus, the present invention makes it possible for a user to easily judge the condition of the interior of the water service box and easily repair it. After such work is completed, the water service box is simply finished with the openable plate. 
     Meanwhile, in the case having no water service box type water tap connection system, a water tap is directly mounted to the wall using an elbow and a support plate without a water service box. In this case, because the water tap connection system is relatively simple, work can be performed conveniently. As a result, a visual effect and an economic effect are enhanced. 
     When constructing the double pipe, a foam polyethylene heat insulation tube may be installed at a junction between the floor and the wall and, thereafter, the double pipe is inserted into the foam polyethylene heat insulation tube. Consequently, the double pipe can be guided and additionally protected by the foam polyethylene heat insulation tube. 
     To prevent the pipes from freezing, a heating wire may be provided in a water service box. In this case, the heating wire is provided in each double pipe of the water service box, so that the soft pipe of the double pipe is efficiently prevented from freezing by heat generated by the heating wire. Thus, the present invention prevents the loss of time and money due to freezing pipes. 
     Furthermore, in the present invention, a heating pipe, through which water heated by a boiler circulates, may be disposed adjacent to pipes having a likelihood of freezing. Therefore, heat is transferred from the heating pipe to the related pipes, thus preventing the pipes from freezing. 
     Meanwhile, in the present invention, a boiler case assembly is provided. In detail, a boiler holder is provided on a rear wall of a case. A pipe insert hole is formed through a lower surface of the case. A bracket is provided on the outer surface of each corner of a case cover. Both a discharge pipe insert hole and an intake pipe insert hole are formed through an upper end of the case cover. A door, which has vent holes and an opening and closing button therein, is provided below the discharge pipe insert hole and the intake pipe insert hole. The case cover is integrally coupled to the case. Thus, the present invention solves problems of the prior arts in that, because a boiler is installed outdoors, the heat of the sun or the rain or wind may have a bad influence on the boiler. In addition, the present invention can increase spatial efficiency and reliably protect the boiler. 
     In the case of a boiler case assembly being attached to the surface of a wall, a case, in which a boiler is received, is placed at a predetermined position. A door, which has vent holes and a locking device, is coupled to a front end of the case. Two boiler holders are provided at upper and medial positions on a rear wall of the case. An opening is formed at a lower position through the rear wall of the case. The boiler case assembly, in which the boiler is received, is mounted to the surface of the wall. Thus, the present invention solves problems of the prior arts in that, because a boiler is installed outdoors, the heat of the sun or the rain or wind may have a bad influence on the boiler. In addition, the present invention can increase spatial efficiency and reliably protect the boiler. Moreover, because pipes coupled to the boiler are embedded in the wall, a good external appearance is ensured. 
     Meanwhile, a piping box is integrally or separately provided at a lower portion of the boiler case assembly. A wall chamber is formed in the wall at a position corresponding to the piping box. Thus, when installing or repairing the boiler, a piping process can be easily performed. As well, because the pipes coupled to the boiler are not exposed to the outside, a good external appearance results. 
     Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.