Patent Publication Number: US-2022235892-A1

Title: Coupling assembly for pipe branching

Description:
TECHNICAL FIELD 
     The present invention relates to a coupling assembly for pipe branching and, more specifically, to a coupling assembly for pipe branching, which allows assembly man-hours to be reduced, has a simplified structure to reduce a construction cost, and effectively prevents leakage of a branching fluid even when a diameter of a branch hole formed in an inflow pipe is increased in order to increase a flow rate in a branch pipe through which the fluid is supplied to a sprinkler. 
     BACKGROUND ART 
     Generally, sprinklers, which include sensors for detecting fires occurring around ceilings to extinguish the fires early by automatically sprinkling high-pressure fluids, are installed on each floor in buildings such as apartment houses. 
     To this end, a main pipe through which a fluid is supplied from the outside is installed, inflow pipes, on which a plurality of sprinklers are installed, are installed to communicate with the main pipe, and branch pipes for supplying the fluid to the sprinkles are installed on the inflow pipes. 
     However, in the conventional case, a branch pipe is installed in a manner of being welded to a branch hole formed in an inflow pipe in order to install the inflow pipe and the branch pipe that communicate with each other, or the inflow pipe and the branch pipe are installed on a T-pipe in which branches are formed to fluidly communicate with each other. Such a manner has problems in that many assembly man-hours and the large number of parts are required, and thus a construction cost is wasted. 
     In addition, when a diameter of the branch hole formed in the inflow pipe is increased in order to increase a flow rate of a fluid supplied to a sprinkler, there is a problem in that the fluid leaks. 
     Accordingly, there is a need for reduction of the problems. 
     DISCLOSURE 
     Technical Tasks 
     The present invention is directed to providing a coupling assembly for pipe branching which allows assembly man-hours to be reduced and of which a structure is simplified to reduce a construction cost. 
     In addition, the present invention is directed to providing a coupling assembly for pipe branching which is capable of effectively preventing leakage of a branching fluid even when a diameter of a branch hole installed in an inflow pipe is increased in order to increase a flow rate in a branch pipe through which the fluid is supplied to a sprinkler. 
     Technical Solution 
     One aspect of the present invention provides a coupling assembly including an inflow pipe in which a branch hole for branching of an introduced fluid is formed, a branch pipe which communicates with the inflow pipe so that the fluid branched off through the branch hole flows, and a coupler which connects the inflow pipe and the branch pipe, wherein the coupler includes a body part surrounding a circumference of the branch hole and a gasket part disposed between the body part and an outer circumferential surface of the inflow pipe and pressed by the body part to prevent leakage of the fluid being branched off, and a degree of pressurization against the gasket part by the body part increases in a direction away from the branch hole. 
     A base, which is pressed by a pressing surface formed on the body part to prevent fluid leakage, may be formed on the gasket part, and a reinforcement surface may be formed on the base to increase the degree of pressurization by the pressing surface in the direction away from the branch hole. 
     A thickness of the reinforcement surface may increase in the direction away from the branch hole. 
     A reinforcement protrusion extending in an axial direction of the branch pipe may be formed on the base, an insertion groove into which the reinforcement protrusion is inserted may be formed in the body part, and the pressing surface, which presses the reinforcement protrusion, may be formed on an inner circumferential surface of the insertion groove. 
     An expansion groove extending in a circumferential direction of the branch hole and a supply path which guides the fluid so that the fluid is introduced into the expansion groove may be formed in the reinforcement protrusion. 
     The expansion groove may include a first expansion groove which is open in a circumferential direction of the branch pipe, and the supply path may include a first supply path which guides the fluid so that the fluid is introduced into the first expansion groove. 
     The expansion groove may include a second expansion groove which is open in the axial direction of the branch pipe, and the supply path may include a second supply path which guides the fluid so that the fluid is introduced into the second expansion groove. 
     The expansion groove may include a first expansion groove which is open in a circumferential direction of the branch pipe and a second expansion groove which is open in the axial direction of the branch pipe, and the supply path may include a first supply path which guides the fluid so that the fluid is introduced into the first expansion groove and a second supply path which guides the fluid so that the fluid is introduced into the second expansion groove. 
     An extension rib extending in an axial direction of the inflow pipe may be formed on the base, a reinforcement part into which the extension rib is inserted may be formed in the body part, and the pressing surface which presses the extension rib may be formed in an inner circumferential surface of the reinforcement part. 
     A support surface extending in a radially inward direction of the inflow pipe may be formed on the reinforcement part, and the support surface may be pressed against and supported by the outer circumferential surface of the inflow pipe. 
     Advantageous Effects 
     According to the present invention, since a coupling assembly for pipe branching having a structure as described above includes a body part surrounding a branch hole around an inflow pipe, a fixing part opposite to the body part, and a gasket part for preventing fluid leakage, assembly man-hours and a construction cost are reduced. 
     In addition, since a degree of pressurization against the gasket part by the body part increases in a direction away from the branch hole, even when a diameter of the branch hole formed in the inflow pipe increases, the leakage of a branching fluid can be effectively prevented. 
     In addition, since a first cut surface and a second cut surface are formed so that a lower end of a flange is positioned above a center of the inflow pipe, when a coupler is coupled, the flange is moved by a fastening force of the fixing part in downward and radially inward directions at the same time to press the gasket part, and thus the leakage of the branching fluid can be more effectively prevented. 
     In addition, since a reinforcement surface, of which a thickness increases in the direction away from the branch hole, is formed on the gasket part, the leakage of the branching fluid can be more effectively prevented. 
     In addition, since a reinforcement protrusion extending in an axial direction of the branch pipe is formed, and an expansion groove, which is expanded when the fluid is introduced, is formed in the reinforcement protrusion, the leakage of the fluid can be more effectively prevented. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a coupling assembly according to one embodiment of the present invention. 
         FIG. 2  is a view illustrating an uncoupled state of the coupling assembly according to one embodiment of the present invention. 
         FIG. 3  is a view illustrating a coupled state of the coupling assembly according to one embodiment of the present invention. 
         FIG. 4  is an enlarged view illustrating a region A of  FIG. 3 . 
         FIG. 5  shows views illustrating states in which a gasket part is pressed in a coupling process of the coupling assembly according to one embodiment of the present invention, wherein (a) of  FIG. 5  is the view illustrating the state before the coupling, and (b) of  FIG. 5  is the view illustrating the state after the coupling. 
         FIG. 6  is a cross-sectional view illustrating a coupling assembly according to another embodiment of the present invention, that is, a view illustrating a state in which the coupling assembly is cut in a direction perpendicular to an axial direction of an inflow pipe. 
         FIGS. 7 to 9  are views illustrating a gasket part included in the coupling assembly according to another embodiment of the present invention, wherein  FIG. 7  is a perspective view illustrating the gasket part, (a) of  FIG. 8  is a front view illustrating the gasket part, (b) of  FIG. 8  is a side view illustrating the gasket part, and  FIG. 9  is a cross-sectional view taken along line I-I of  FIG. 7 . 
         FIGS. 10 to 12  are cross-sectional views illustrating various gasket parts included in a coupling assembly according to still another embodiment of the present invention. 
         FIG. 13  is a cross-sectional view illustrating the coupling assembly according to another embodiment of the present invention, that is, a view illustrating a state in which the coupling assembly is cut in the direction perpendicular to the axial direction of the inflow pipe. 
         FIG. 14  is a cross-sectional view illustrating a coupled state of the coupling assembly of  FIG. 13  and a pipe. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order for those skilled in the art to easily perform the present invention. The present invention may be implemented in several different forms and is not limited to the embodiments described herein. Parts irrelevant to descriptions are omitted in the drawings in order to clearly explain the present invention, and the same or similar parts are denoted by the same reference numerals throughout this specification. 
     It should be further understood that the terms “comprise,” “comprising,” “include,” and/or “including,” when used herein, specify the presence of stated features, numbers, steps, operations, elements, and/or components but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof. 
       FIG. 1  is a perspective view illustrating a coupling assembly according to one embodiment of the present invention,  FIG. 2  is a view illustrating an uncoupled state of the coupling assembly according to one embodiment of the present invention,  FIG. 3  is a view illustrating a coupled state of the coupling assembly according to one embodiment of the present invention,  FIG. 4  is an enlarged view illustrating a region A of  FIG. 3 ,  FIG. 5  shows views illustrating states in which a gasket part is pressed in a coupling process of the coupling assembly according to one embodiment of the present invention, wherein (a) of  FIG. 5  is the view illustrating the state before the coupling, (b) of  FIG. 5  is the view illustrating the state after the coupling,  FIG. 6  is a cross-sectional view illustrating a coupling assembly according to another embodiment of the present invention, that is, a view illustrating a state in which the coupling assembly is cut in a direction perpendicular to an axial direction of an inflow pipe,  FIGS. 7 to 9  are views illustrating a gasket part included in the coupling assembly according to another embodiment of the present invention, wherein  FIG. 7  is a perspective view illustrating the gasket part, (a) of  FIG. 8  is a front view illustrating the gasket part, (b) of  FIG. 8  is a side view illustrating the gasket part, and  FIG. 9  is a cross-sectional view taken along line I-I of  FIG. 7 ,  FIGS. 10 to 12  are cross-sectional views illustrating various gasket parts included in a coupling assembly according to still another embodiment of the present invention,  FIG. 13  is a cross-sectional view illustrating the coupling assembly according to another embodiment of the present invention, that is, a view illustrating a state in which the coupling assembly is cut in the direction perpendicular to the axial direction of the inflow pipe, and  FIG. 14  is a cross-sectional view illustrating a coupled state of the coupling assembly of  FIG. 13  and a pipe. 
     As illustrated in  FIGS. 1 to 3 , the coupling assembly according to the present invention includes an inflow pipe  10  in which a branch hole  11  for branching of an introduced fluid is formed, a branch pipe  20  communicating with the inflow pipe  10  so that the fluid, which branches off through the branch hole  11 , flows, and a coupler  100  which connects the inflow pipe  10  and the branch pipe  20 , the coupler  100  includes a body part  110  surrounding a circumference of the branch hole  11  and a gasket part  130  which is disposed between the body part  110  and an outer circumferential surface of the inflow pipe  10  and pressed by the body part  110  to prevent leakage of a branching fluid. 
     In this case, since a fixing part  120 , which is disposed at a side opposite to the body part  110  with respect to the inflow pipe  10  and fixes the body part  110  to the inflow pipe  10 , is provided, and the body part  110  surrounding the circumference of the branch hole  11  is installed in a manner of being simply fixed using the fixing part  120 , assembly man-hours and a construction cost are reduced, and since the gasket part  130  is provided between the body part  110  and the outer circumferential surface of the inflow pipe  10 , the leakage of the fluid can be effectively prevented. 
     In this case, a diameter of the branch hole  11  formed in the inflow pipe  10  needs to be increased in order to increase a flow rate of the fluid supplied to the sprinkler, and even in this case, a degree of pressurization against the gasket part  130  by the body part  110  increases in a direction away from the branch hole  11  to effectively prevent the leakage of the fluid. 
     In this case, when the diameter of the branch hole  11  increases, a size of the gasket part  130  for preventing the leakage of the fluid also increases, and when the size of the gasket part  130  increases, it may be difficult to uniformly press the gasket part  130 . 
     Particularly, when the size increases to an extent to which a circumference of the gasket part  130  is disposed close to a center c of the inflow pipe  10 , it may be more difficult to uniformly press the gasket part  130 . Here, the case in which the circumference of the gasket part  130  is disposed close to the center c of the inflow pipe  10  means a case in which, as illustrated in  FIG. 2 , the gasket part  130  is formed to extend from a portion, which is close the branch hole  11 , of the inflow pipe  10 , and the circumference of the gasket part  130  extending downward along a circumference of the inflow pipe  10  is disposed close to a line passing through the center c of the inflow pipe  10 . 
     That is, this is because, when the body part  110  is fixed to the inflow pipe  10  using the fixing part  120  in this case, since a fastening force of the fixing part  120  is vertically applied, the gasket part  130  disposed close to the branch hole  11  effectively seals the circumference of the branch hole  11  using the vertical fastening force, but the gasket part  130  extending downward to be disposed close to the center c of the inflow pipe  10  is not effectively pressed even when the vertical fastening force is applied. 
     Accordingly, as described above, when the degree of pressurization against the gasket part  130  by the body part  110  increases in the direction away from the branch hole  11 , even in the case in which the size increases to the extent to which the circumference of the gasket part  130  is disposed close to the center c of the inflow pipe  10 , the leakage of the branching fluid can be effectively prevented. 
     In this case, as illustrated in  FIGS. 1 to 3 , a flange  111 , through which the fixing part  120  passes to be coupled thereto, is formed on the body part  110 , and a first cut surface  111   a  may be formed on the flange  111  so that a lower end of the flange  111  is positioned above the center c of the inflow pipe  10 . As described above, the meaning of the lower end of the flange  111  being positioned above the center c of the inflow pipe  10  is that, as illustrated in  FIG. 2 , the lower end of the flange  111  is disposed above the line passing through the center c of the inflow pipe  10  by a predetermined distance d 1 . 
     That is, when the first cut surface  111   a  is formed on the flange  111  as described above, and the lower end of the flange  111  is positioned above the center c of the inflow pipe  10 , and when the fastening force is applied using the fixing part  120 , the fastening force is applied so that the flange  111  is moved in downward and radially inward directions at the same time, accordingly, the fastening force is applied to the gasket part  130  disposed close to the branch hole  11  only in a vertical direction and applied to the gasket part  130  disposed close to the center c of the inflow pipe  10  in the vertical and radially inward directions at the same time. 
     Since the radially inward fastening force increases in the direction away from the branch hole  11 , the degree of pressurization against the gasket part  130  by the body part  110  increases in the direction away from the branch hole  11 , and even when the size of the gasket part  130  increases, the fluid leakage can be effectively prevented. 
     In this case, as illustrated in  FIGS. 1 to 3 , a second cut surface  111   b  may be formed on the flange  111  to be positioned above the first cut surface  111   a  so that a step is formed therebetween. As described above, the meaning of the second cut surface  111   b  being positioned above the first cut surface  111   a  is that, as illustrated in  FIG. 2 , the second cut surface  111   b  is disposed to be spaced upward from a line connecting the first cut surface  111   a  by a predetermined distance d 2 . 
     When the second cut surface  111   b  is formed as described above, since a thickness of a part of the flange  111  decreases, as illustrated in  FIGS. 3 and 4 , the flange  111  is easily deformed. Although the flange  111  is disposed at an initial position l 1  before the fastening force is applied through the fixing part  120 , when the fastening force is applied through the fixing part  120  in this state, while the flange  111  is deformed by a predetermined distance Δl, the flange  111  presses the gasket part  130  in the downward direction and presses the gasket part  130  in the radially inward direction as much as the predetermined distance Δl at the same time so that fluid leakage can be effectively prevented even when the size of the gasket part  130  increases. 
     Particularly, since the second cut surface  111   b  is disposed above the first cut surface  111   a , when the fastening force of the fixing part  120  is applied, the gasket part  130  is further easily pressed by the flange  111  in the radially inward direction. 
     In this case, a pressing surface  112  extending along the outer circumferential surface of the inflow pipe  10  to press the gasket part  130  is formed on the body part  110 , and the gasket part  130  and the pressing surface  112  may be formed to extend to the lower end of the flange  111 . 
     As described above, a part of the flange  111  is deformed by the fastening force of the fixing part  120  to press the gasket part  130  in the radially inward direction. That is, when the pressing surface  112  pressing the gasket part  130  is formed on the body part  110 , and the gasket part  130  and the pressing surface  112  are formed to extend to the lower end of the flange  111 , a pressing force due to the deformation of the flange  111  may be maximized, and thus, the fluid leakage can be effectively prevented. 
     In this case, a guide rib  113  inserted into a portion surrounded by an inner circumferential surface of the branch hole  11  may be formed on the body part  110 , and thus, a position of the body part  110  may be stably fixed when the body part  110  is fixed. That is, even when an external force is applied to the body part  110 , the body part  110  is prevented from rotating along the circumference of the inflow pipe  10 . 
     In addition, since the guide rib  113  is formed, a flow of the branching fluid is effectively guided after the coupling using the fixing part  120 . 
     In this case, the fixing part  120  includes a fixing member  121  which applies the fastening force in a state in which the fixing member  121  supports the outer circumferential surface of the inflow pipe  10 , and a U bolt, which supports a part of the outer circumferential surface of the inflow pipe  10  in a manner of surrounding the part, may be used as the fixing member  121 . 
     When the fixing member  121  is installed to pass through the flange  111  of the body part  110  and applies the fastening force thereto, the flange  111  moves downward and is deformed in the radially inward direction at the same time by the fastening force. 
     That is, as illustrated in (a) of  FIG. 5 , before the fastening force is applied, the thickness of the entire gasket part  130  is formed to be constant, after the fastening force is applied, as illustrated in (b) of  FIG. 5 , an upper end of the gasket part  130  is pressed downward, and in a direction toward a lower end of the gasket part  130 , the gasket part  130  is pressed in the downward and radially inward directions at the same time to effectively prevent the fluid leakage. 
     In this case, an outer diameter of the inflow pipe  10  may be formed to be the same as an outer diameter of the branch pipe  20 . That is, when the flow rate of the branching fluid needs to be increased, the branch pipe  20  having the outer diameter which is the same as the outer diameter of the inflow pipe  10  may be used, and in this case, although a diameter of the branch hole  11  is also increased, as described above, the fluid leakage can be effectively prevented by pressing the gasket part  130  in the downward and radially inward directions at the same time due to deformation of the flange  111  by the fastening force of the fixing part  120 . 
     In this case, as illustrated in  FIGS. 6 and 7 , a coupler  100  includes a body part  110  which surrounds a circumference of a branch hole  11  and a gasket part  130  which prevents leakage of a branching fluid while being pressed by the body part  110 . As illustrated in  FIG. 8 , a base  131 , which prevents fluid leakage while being pressed by a pressing surface  112  formed on the body part  110 , is formed on the gasket part  130 , and a reinforcement surface  133  may be formed on the base  131  so that a degree of pressurization by the pressing surface  112  increases in a direction away from the branch hole  11 . 
     That is, basically, while the base  131  is pressed by the pressing surface  112  of the body part  110 , the leakage of the fluid is prevented. As described above, when a diameter of the branch hole  11  increases, since a size of the gasket part  130  for preventing the leakage of the fluid also increases so that it is difficult to uniformly press the gasket part  130 , the reinforcement surface  133  is formed on the base  131  to increase the degree of pressurization by the pressing surface  112  in the direction away from the branch hole  11 . 
     In this case, a thickness b of the reinforcement surface  133  may be formed to increase in the direction away from the branch hole  11 . 
     That is, as illustrated in (a) of  FIG. 8 , a thickness a of the base  131  is formed to be constant, but, when the thickness b of the reinforcement surface  133  is formed to increase in the direction away from the branch hole  11 , since the degree of pressurization by the pressing surface  112  increases in the direction away from the branch hole  11 , the gasket part  130  may be uniformly pressed even when the size of the gasket part  130  increases, and thus the fluid leakage can be effectively prevented. 
     In this case, as illustrated in (b) of  FIG. 8 , a reinforcement protrusion  132  extending in an axial direction of a branch pipe  20  is formed on the base  131 , and as illustrated in  FIG. 6 , an insertion groove  110   a  into which the reinforcement protrusion  132  is inserted is formed in the body part  110 , and the pressing surface  112 , which presses the reinforcement protrusion  132 , may be formed on an inner circumferential surface of the insertion groove  110   a.    
     That is, as illustrated in  FIG. 9 , the base  131  is formed to extend along a circumference of an inflow pipe  10 , and the reinforcement protrusion  132  is formed to extend from the base  131  in the axial direction of the branch pipe  20 . In addition, when the insertion groove  110   a , into which the reinforcement protrusion  132  is inserted, is formed in the body part  110 , and the pressing surface  112  is formed on the inner circumferential surface of the insertion groove  110   a  to press the reinforcement protrusion  132 , the fluid leakage around the branch hole  11  may be effectively prevented. 
     Here, as illustrated in  FIGS. 10 to 12 , an expansion groove  132   a  extending in a circumferential direction of a branch hole  11  may be formed in a reinforcement protrusion  132 . 
     That is, as described above, while the reinforcement protrusion  132  is pressed by a pressing surface  112  formed on an inner circumferential surface of an insertion groove  110   a , fluid leakage is prevented, but when the expansion groove  132   a , into which a fluid is introduced, is formed in the reinforcement protrusion  132 , and when the fluid is supplied while being used later, the fluid is introduced into the expansion groove  132   a  to elastically deform the reinforcement protrusion  132 , and thus a pressing force by the pressing surface  112  increases relatively so that the fluid leakage may be more effectively prevented. In addition, a supply path  132   b , which guides a fluid, is formed in the reinforcement protrusion  132  to introduce the fluid into the expansion groove  132   a.    
     As illustrated in  FIG. 10 , an expansion groove  132   a  includes a first expansion groove  132   a   1  which is open in a circumferential direction of a branch pipe  20 . That is, when a fluid is introduced into the first expansion groove  132   a   1  formed as described above, while a reinforcement protrusion  132  is elastically deformed in an axial direction of the branch pipe  20 , a pressing force by an inner circumferential surface of an insertion groove  110   a  increases further. 
     In this case, a supply path  132   b  may include a first supply path  132   b   1  which guides the fluid so that the fluid is introduced into the first expansion groove  132   a   1 , and since the first expansion groove  132   a   1  is formed in a side surface of the reinforcement protrusion  132 , as illustrated in  FIG. 10 , a length of the first supply path  132   b   1  is formed to be short. In addition, since the length of the first supply path  132   b   1  is formed to be short, the fluid is quickly introduced into the first expansion groove  132   a   1  so that the fluid leakage can be quickly prevented. 
     Alternatively, as illustrated in  FIG. 11 , such an expansion groove  132   a  includes a second expansion groove  132   a   2  which is open in an axial direction of a branch pipe  20 . That is, when a fluid is introduced into the second expansion groove  132   a   2  formed as described above, while a reinforcement protrusion  132  is elastically deformed in a circumferential direction of the branch pipe  20 , a pressing force by inner circumferential surfaces of an insertion groove  110   a  increases further. Particularly, since a pair of inner circumferential surfaces, which are disposed opposite to each other, are formed in the insertion groove  110   a , when the reinforcement protrusion  132  is elastically deformed as described above, an effect of preventing the fluid leakage is further improved by the pressing force by the pair of inner circumferential surfaces. 
     In this case, a supply path  132   b  may include a second supply path  132   b   2  which guides a fluid to introduce the fluid into the second expansion groove  132   a   2 , and since the second expansion groove  132   a   2  is formed in an upper surface of the reinforcement protrusion  132 , the second supply path  132   b   2  is formed to extend to guide the fluid to the second expansion groove  132   a   2 . 
     That is, since a first expansion groove  132   a   1  is formed in a side surface of the reinforcement protrusion  132 , the fluid may be quickly introduced thereinto, and thus there is the effect of quickly preventing the fluid leakage. In addition, since the second expansion groove  132   a   2  is formed in the upper surface of the reinforcement protrusion  132 , when the fluid is introduced thereinto, the pair of inner circumferential surfaces disposed opposite to each other in the insertion groove  110   a  are pressed at the same time, and thus the effect of preventing the fluid leakage can be further improved. 
     In addition, as illustrated in  FIG. 12 , an expansion groove  132   a  may include a first expansion groove  132   a   1  which is open in a circumferential direction of a branch pipe  20  and a second expansion groove  132   a   2  which is open in an axial direction of the branch pipe  20 . 
     That is, as described above, the first expansion groove  132   a   1  may quickly prevent fluid leakage, and the second expansion groove  132   a   2  may further improve an effect of preventing the fluid leakage. When the first expansion groove  132   a   1  and the second expansion groove  132   a   2  are formed together as described above, an amount of a fluid introduced into the expansion groove  132   a  increases to increase an amount of elastic change of a reinforcement protrusion  132 , and thus a pressing force pressing inner circumferential surfaces of an insertion groove  110   a  increases so that the fluid leakage can be more effectively prevented in addition to the effects described above. 
     In this case, a supply path  132   b  may include a first supply path  132   b   1  which guides the fluid so that the fluid is introduced into the expansion groove  132   a   1  and a second supply path  132   b   2  which guides the fluid so that the fluid is introduced into the second expansion groove  132   a   2 . That is, while the fluid is primarily supplied to the first expansion groove  132   a   1  through the first supply path  132   b   1 , the fluid leakage may be quickly prevented, and while the fluid is introduced into the second expansion groove  132   a   2  through the second supply path  132   b   2  after the fluid is completely introduced into first expansion groove  132   a   1 , a pair of inner circumferential surfaces formed in the insertion groove  110   a  are pressed so that the fluid leakage can be more effectively prevented. 
     That is, when the gasket part is formed as described above, not only the fluid leakage may be quickly prevented but also the fluid leakage can be more effectively prevented. 
     In this case, as illustrated in (b) of  FIG. 8  and  FIG. 9 , an extension rib  134  extending in an axial direction of the inflow pipe  10  is formed on the base  131 , a reinforcement part  114  into which the extension rib  134  is inserted is formed on the body part  110 , and the pressing surface  112 , which presses the extension rib  134 , may be formed on an inner circumferential surface of the reinforcement part  114 . 
     That is, as the extension rib  134  is formed to extend in the axial direction of the inflow pipe  10 , and the pressing surface  112  is formed on the inner circumferential surface of the reinforcement part  114  to press the extension rib  134 , the fluid leakage through the branch hole  11  may be more effectively prevented. 
     In this case, as illustrated in  FIGS. 13 and 14 , a support surface  114   a  extending in a radially inward direction of the inflow pipe  10  may be formed on the reinforcement part  114 , and the support surface  114   a  may be pressed against and supported by an outer circumferential surface of the inflow pipe  10 . 
     A sprinkler is installed on a rear end of the branch pipe  20  described above, a typical standard related to the sprinkler may include the standard of Underwriters Laboratories (UL) in the United States, and according to the standard of UL, it is required that fluid leakage should be effectively prevented when an external force is applied to the rear end of the branch pipe  20  in a direction parallel to the axial direction of the inflow pipe  10  in a state in which the sprinkler is installed. That is, even when a force is vertically applied to the branch pipe  20 , the fluid leakage should be effectively prevented. To this end, when the support surface  114   a , which extends in the radially inward direction of the inflow pipe  10  and is pressed against and supported by the outer circumferential surface of the inflow pipe  10  is formed on the reinforcement part  114  as described above, the fluid leakage can be effectively prevented even when an external force according the UL standard is applied. 
     In addition, when the support surface  114   a  is formed as described above, since the extension rib  134  formed on the base  131  is prevented from being exposed to the outside, deterioration of durability of the gasket part  130  can be effectively prevented. 
     While the embodiments of the present invention have been described above, the spirit of the present invention is not limited to the embodiments proposed in this specification, and other embodiments may be easily suggested by adding, changing, and deleting components by those skilled in the art and will fall within the spiritual range of the present invention.