Patent Publication Number: US-2004050006-A1

Title: Composite panel for reparing, reinforcing con&#39;c body and method of using the same

Description:
TECHNICAL FIELD  
       [0001] The present invention relates to a panel for repairing and reinforcing a concrete body, a multi-purpose anchor, an anchor for level adjustment and injection and a method for repairing and reinforcing the concrete body using the same. More particularly, the present invention relates to a panel for repairing and reinforcing a concrete body, a multi-purpose anchor, an anchor for level adjustment and injection and a method for repairing and reinforcing the concrete body using the same, which can connect adhesives and anchors at weak parts of the concrete body, which is neutralized, aged, deteriorated, cracked due to water leakage, or segregated, or at parts requiring the repair and reinforcement due to a change in use environment.  
       BACKGROUND ART  
       [0002] People have generally recognized that a reinforced concrete body is semi-permanent, but the reinforced concrete body is aged and deteriorated due to various causes, such as neutralization, corrosion of reinforced steels, exfoliation of an outer layer due to dryness, contraction and expansion, error in design, false construction, fatigue load, change in use environment, as time passes and the use environment is changed, and thereby the concrete body needs repair and reinforcement. So, new materials and new construction methods for restraining the progress of the deterioration in structure and repairing and reinforcing the concrete body have been studied and developed.  
       [0003] Recently, as generally used methods for repairing and reinforcing the concrete body, there are a carbon fiber sheet reinforcing method, a glass fiber sheet reinforcing method, an aramide fiber sheet reinforcing method, a steel plate adhering and reinforcing method, a method for reinforcing synthetic resin panel, in which reinforce fiber and thermosetting resin are composed, and so on. Additionally, as the concrete body repairing method, there are a patching method and a section restoring method.  
       [0004] The carbon fiber sheet reinforcing method, the glass fiber sheet reinforcing method and the aramide fiber sheet reinforcing method are performed in such a manner that a concrete body to be reinforced is surface-treated, primer is coated on the surface, the surface is leveled by epoxy putty agent, and the fiber sheet (carbon fiber sheet, glass fiber sheet or aramide fiber sheet) is impregnated in the concrete body and adhered to the concrete body by epoxy resin (for adhesion and impregnation).  
       [0005] Such reinforcing method using the fiber sheet is lightweight, and has good operation efficiency, anticorrosion, high strength, high elasticity coefficient, salt tolerance and chemical resistance. However, the reinforcing method using the fiber sheet has several problems that it is very weak in heatproof and fireproof, and thereby poisonous gas is generated and the reinforcing effect drops rapidly to cause loss of lives and properties when there is a fire. Moreover, the main process of the reinforcing method using the reinforced fiber is the impregnation of the reinforced fiber, but in fact, it is difficult to perfectly impregnate the reinforced fiber due to a difficult condition in a construction site, and the reinforcing effect and realization of performance depend on the manpower&#39;s technical level in the construction site. Furthermore, it is necessary to perform a repetitive lamination process to secure a proper reinforcing strength.  
       [0006] The steel plate adhering method is a construction method performed in such a manner that a concrete body to be reinforced is surface-treated, steel plates are mounted and sealed after an anchoring work and a welding work, and epoxy resin is injected and adhered. The steel plate adhering method has several advantages that materials can be easily bought and properties of the materials can be surely shown. However, the method has several disadvantages that it is difficult to carry and handle the materials and to supervise safety because the steel plates are heavy (generally, steel plate of 4.5 mm or more is used to secure required strength), and there is a danger of fire due to the use of fire for welding or others. Additionally, the method has a load burden of the reinforced concrete body due to an increase of excessive dead load after the reinforcement, corrosion of the steel plates, and weak thermal efficiency in fireproof and heatproof.  
       [0007] In the synthetic resin panel adhering and reinforcing method and the steel plate adhering and reinforcing method, panels are fixed with anchors, and gaps formed between the panels and a concrete body are filled with filler such as thermosetting resin. For the filling process, various materials besides the anchors are mounted, that is, spacers are mounted at regular intervals to form gap uniformly, injection holes are formed to inject the filler and air discharge holes are formed to discharge the inside air to the outside while the filler is inserted. Because the spacers, the injection holes and the air discharge holes must be mounted at several portions of the panel, it takes much time to mount them, and thereby the panel may be damaged and polluted and the filler does not sealably fill the gaps to cause a drop of the reinforcing effect because it is very difficult, in installation structure, to discharge the inside air of the anchor hole. Furthermore, because most of the existing anchors are made of metal, if the wet concrete body is reinforced, it becomes rusty as time passes, and thereby its performance is deteriorated and the outward appearance becomes bad.  
       [0008] The patching and section restoring methods are performed in such a manner that weak parts of the concrete body is dug and removed, an anticorrosive treatment is performed if reinforced steels are oxidized, repairing materials are inserted into cracked portions to prevent the reinforced steels from being contacted with air or water, the removed portions are plastered with epoxy mortar, non-contracted concrete and various polymer cement mortar several times, and the section is restored. For the repairing materials and methods, various kinds of materials and methods have been developed, for example, a polyurethane injection method, an epoxy injection method for moistening, a micro-cement injection method, a section restoring method using epoxy group mortar, a section restoring method using various polymer cement mortars such as acryl group high intensity mortar, and so on. However, though the applied materials are very good, because the section restoration of the removed concrete body is finished by the plastering work, the conventional methods has a limitation in adhesive strength between the existing concrete body and the surface restored in section. Additionally, as time passes, the exfoliation and cracks are generated again and air and water flow into the exfoliated and cracked surface, and thereby the concrete body is returned into the previous condition (e.g., the reinforced steels are corroded).  
       [0009] Therefore, this inventor has developed a panel for repairing and reinforcing a concrete body, a multi-purpose anchor, an anchor for level adjustment and injection and a method for repairing and reinforcing the concrete body using the same to improve the conventional method for repairing and reinforcing the concrete body.  
       DISCLOSURE OF INVENTION  
       [0010] Accordingly, it is an object of the present invention to provide a composite reinforced panel, in which a reinforced fiber sheet is composed to a steel plate, and a method for repairing and reinforcing using it capable of securing safety of a concrete body.  
       [0011] It is another object of the present invention to provide a composite reinforced panel, in which a reinforced fiber sheet is composed to a steel plate, and a method for repairing and reinforcing using it capable of maximizing features of each material, improving heatproof and fireproof properties of the composite reinforced panel by supplementing demerits of the materials, and preventing brittle break by securing softness of the composite reinforced panel.  
       [0012] It is a further object of the present invention to provide a lightweight precast concrete composite reinforced panel, in which steel plates are connected to a lightweight precast concrete panel, to reinforce the capacity of the concrete body.  
       [0013] It is a still further object of the present invention to provide reinforcing means a lightweight precast concrete panel for reinforcing the capacity of the concrete body.  
       [0014] It is a still further object of the present invention to provide means capable of improving bad construction due to the conventional site impregnation by manufacturing various composite reinforced panels in factory, and providing uniform and safe reinforcing effects by lowering dependence on technical engineers of a construction site in impregnation and adhesion, which are main elements of construction quality.  
       [0015] It is a still further object of the present invention to provide means capable of injecting filler through an anchor without any injection hole.  
       [0016] It is a still further object of the present invention to provide means capable of forming regular intervals between the panel and the concrete body without mounting spacers.  
       [0017] It is a still further object of the present invention to provide means capable of discharging air, which is between the panel and the concrete body, by the anchor without any air discharge hole while the filler is injected.  
       [0018] It is a still further object of the present invention to provide a lightweight precast concrete panel  410  for improving fireproof and heatproof of the surface of the concrete body, which is reinforced and finished through a reinforcing method using the existing carbon fiber sheet, glass fiber sheet or aramide fiber sheet. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0019] Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawing in which:  
     [0020]FIG. 1 illustrates a sectional view of a detailed example of a composite panel for reinforcing a concrete body according to the present invention;  
     [0021]FIG. 2 illustrates a flow chart showing a manufacturing method of the composite panel of FIG. 1;  
     [0022]FIG. 3 illustrates a sectional view of another detailed example of a composite panel for reinforcing a concrete body according to the present invention;  
     [0023]FIG. 4 illustrates a flow chart showing a manufacturing method of the composite panel of FIG. 3;  
     [0024]FIG. 5 illustrates a schematic view of a manufacturing process and a structure of a lightweight precast concrete panel according to the present invention;  
     [0025]FIG. 6 illustrates a flow chart of the manufacturing process of the lightweight precast concrete panel according to the present invention;  
     [0026]FIG. 7 illustrates a schematic view of a manufacturing process of a lightweight precast concrete composite reinforced panel according to the present invention;  
     [0027]FIG. 8 illustrates a brief perspective view of the lightweight precast concrete composite reinforced panel for repairing a concrete body according to the present invention;  
     [0028]FIG. 9 illustrates an elevation view and a sectional view of an anchor for adjusting level of panel and injecting;  
     [0029]FIG. 10 illustrates a view showing a state that the anchor for adjusting level of panel and injecting is connected with an injection pipe and a clip.  
     [0030]FIG. 11 illustrates an elevation view and a partially sectional view of an insert and an expansion hole according to the present invention;  
     [0031]FIG. 12 illustrates an elevation view and a partially sectional view of a bolt and an injection pipe according to the present invention;  
     [0032]FIG. 13 illustrates a schematic view showing a state that a lower portion of a beam is reinforced using the lightweight precast concrete composite reinforced panel;  
     [0033]FIG. 14 illustrates a schematic view showing a state that a lower portion and a side of a beam is reinforced using the lightweight precast concrete composite reinforced panel;  
     [0034]FIG. 15 illustrates a schematic view showing a state that a damaged part of the concrete road is repaired using the panel for repairing the concrete body and the anchor for level adjustment and injection;  
     [0035]FIG. 16 illustrates a flow chart of an adhesion type reinforcing method, which is a method for reinforcing the concrete body using the composite panel for reinforcing the concrete body according to the present invention; and  
     [0036]FIG. 17 illustrates a schematic view showing a state that the damaged part of the concrete road is repaired using the panel for repairing the concrete body and a multi-purpose anchor. 
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION  
     [0037] The present invention will now be described in detail in connection with preferred embodiments with reference to the accompanying drawings. For reference, like reference characters designate corresponding parts throughout several views.  
     [0038]FIG. 1 illustrates a sectional view of a detailed example of a composite panel for reinforcing a concrete body according to the present invention, and FIG. 2 illustrates a flow chart showing a manufacturing method of the composite panel of FIG. 1. In FIGS. 1 and 2, the composite panel for reinforcing the concrete body includes: a steel plate  510  of a prescribed size; an impregnable adhesion layer  520 ′ formed on an upper surface of the steel plate  510 ; a reinforced fiber  530  mounted on the upper surface of the steel plate  510  and impregnated and adhered by the impregnable adhesion layer  520 ′; and powder  540  sprayed on the upper surface of the steel plate  510  and impregnated and adhered on the surface of the impregnable adhesion layer  520 ′. Additionally, the manufacturing method of the composite panel includes the steps of: forming the impregnable adhesion layer  520 ′ on a surface of the steel plate  510  cut in a prescribed size; impregnating and adhering the reinforced fiber  530  on the surface of the steel plate  510 , on which the impregnable adhesion layer  520 ′ is formed; spraying, impregnating and adhering the powder  540  on the surface of the steel plate  510  and the reinforced fiber sheet layer  530 ; and hardening the impregnable adhesion layer  520 ′ formed in the second step.  
     [0039] In the same way as the manufacturing method, as shown in FIG. 1 b , a sandwich type composite panel is manufactured in such a manner that reinforced fibers are impregnated and adhered to both surfaces of a steel plate and then powder is sprayed and adhered.  
     [0040] The composite reinforced panel for reinforcing the concrete body further includes: an adhesion layer formed on a lower surface of the steel plate of the composite panel (see FIGS. 1 a  and  1   b ); and a lightweight precast concrete panel  550  of a prescribed size adhered on the lower surface of the steel plate by the adhesion layer, thereby increasing reinforcing power and fireproof property. Instead of the lightweight precast concrete panel  550 , another precast concrete panel using a general aggregate may be used (see FIG. 5).  
     [0041] When the lightweight precast concrete panel  550  is cut in the form of a flat rectangle, the composite panel for reinforcing the concrete body of FIGS. 1 a  and  1   b  is cut in the same size as the lightweight precast concrete panel to be connected with the lightweight precast concrete panel, or cut larger than the lightweight precast concrete panel and has a protrusion at one side of four sides, two protrusions at opposite sides, three protrusions at three sides except one side, or four protrusions at all sides to be connected with the lightweight precast concrete panel. It is to increase reinforcing effect by connecting the adjacent composite panels through the composite panel of FIGS. 1 a  and  1   b . It will be appreciated that another precast concrete panel using a general aggregate may be used instead of the lightweight precast concrete panel  550 .  
     [0042] The composite panel for reinforcing the concrete body may include: a reinforced fiber of a prescribed size; an impregnable adhesion layer formed on an upper surface of the reinforced fiber; a steel plate mounted on the upper surface of the reinforced fiber and impregnated and adhered by the impregnable adhesion layer; and powder sprayed, impregnated and adhered on the upper surface of the steel plate. Additionally, the composite reinforced panel for reinforcing the concrete body further includes: an adhesion layer formed on a lower surface of the reinforced fiber of the composite panel for reinforcing the concrete body; and a lightweight precast concrete panel of a prescribed size mounted on the lower surface of the reinforced fiber and adhered by the adhesion layer, thereby increasing reinforcing power and fireproof property. Furthermore, when the lightweight precast concrete panel is cut in the form of a flat rectangle, the composite panel (including: a reinforced fiber of a prescribed size; an impregnable adhesion layer formed on an upper surface of the reinforced fiber; a steel plate mounted on the upper surface of the reinforced fiber and impregnated and adhered by the impregnable adhesion layer; and powder sprayed, impregnated and adhered on the upper surface of the steel plate) is cut in the same size as the lightweight precast concrete panel to be connected with the lightweight precast concrete panel, or cut larger than the lightweight precast concrete panel and has a protrusion at one side of four sides, two protrusions at opposite sides, three protrusions at three sides except one side, or four protrusions at all sides to be connected with the lightweight precast concrete panel. It is to increase reinforcing effect by connecting the adjacent composite panels through the composite panel of FIGS. 1 a  and  1   b . It will be appreciated that another precast concrete panel using a general aggregate may be used instead of the lightweight precast concrete panel  550 .  
     [0043] The composite panel for reinforcing the concrete body may include: an upper steel plate of a prescribed size; a lower steel plate of a prescribed size; an impregnable adhesion layer formed on an upper surface of the upper steel plate; a reinforced fiber mounted on the upper surface of the upper steel plate and impregnated and adhered by the impregnable adhesion layer; an adhesion layer formed on an upper surface of the reinforced fiber; a lower steel plate adhered by the adhesion layer formed on the upper surface of the reinforced fiber; an adhesion layer formed on the surfaces of the upper and lower steel plates; and powder sprayed and adhered on the adhesion layer formed on the surfaces of the upper and lower steel plates. Additionally, the composite reinforced panel for reinforcing the concrete body further includes: an adhesion layer formed on a lower surface of the lower steel plate; and a lightweight precast concrete panel of a prescribed size adhered on the lower steel plate by the adhesion layer, thereby increasing reinforcing power and fireproof property. Furthermore, when the lightweight precast concrete panel is cut in the form of a flat rectangle, the composite panel (including: an upper steel plate; a lower steel plate; an impregnable adhesion layer formed on an upper surface of the upper steel plate; a reinforced fiber mounted on the upper surface of the upper steel plate and impregnated and adhered by the impregnable adhesion layer; an adhesion layer formed on an upper surface of the reinforced fiber; a lower steel plate adhered by the adhesion layer formed on the upper surface of the reinforced fiber; an adhesion layer formed on the surfaces of the upper and lower steel plates; and powder sprayed and adhered on the adhesion layer formed on the surfaces of the upper and lower steel plates) is cut in the same size as the lightweight precast concrete panel to be connected with the lightweight precast concrete panel, or cut larger than the lightweight precast concrete panel and has a protrusion at one side of four sides, two protrusions at opposite sides, three protrusions at three sides except one side, or four protrusions at all sides to be connected with the lightweight precast concrete panel. It is to increase reinforcing effect by connecting the adjacent composite panels through the composite panel of FIGS. 1 a  and  1   b . It will be appreciated that another precast concrete panel using a general aggregate may be used instead of the lightweight precast concrete panel  550 .  
     [0044] The composite panel for reinforcing the concrete body may include: a steel plate of a prescribed size; an impregnable adhesion layer formed on an upper surface of the steel plate; an upper reinforced fiber mounted on the upper surface of the steel plate and impregnated and adhered by the impregnable adhesion layer; powder sprayed, impregnated and adhered on an upper surface of the upper reinforced fiber; an impregnable adhesion layer formed on a lower surface of the steel plate; a lower reinforced fiber mounted on the lower surface of the steel plate and impregnated and adhered by the impregnable adhesion layer; and powder sprayed, impregnated and adhered on a lower surface of the lower reinforced fiber. Additionally, the composite reinforced panel for reinforcing the concrete body further includes: an adhesion layer formed on a lower surface of the lower reinforced fiber; and a lightweight precast concrete panel mounted on the lower portion of the lower reinforced fiber and adhered by the adhesion layer, thereby increasing reinforcing power and fireproof property. Furthermore, when the lightweight precast concrete panel is cut in the form of a flat rectangle, the composite panel (including: a steel plate; an impregnable adhesion layer formed on an upper surface of the steel plate; an upper reinforced fiber mounted on the upper surface of the steel plate and impregnated and adhered by the impregnable adhesion layer; powder sprayed, impregnated and adhered on an upper surface of the upper reinforced fiber; an impregnable adhesion layer formed on a lower surface of the steel plate; a lower reinforced fiber mounted on the lower surface of the steel plate and impregnated and adhered by the impregnable adhesion layer; and powder sprayed, impregnated and adhered on a lower surface of the lower reinforced fiber) is cut in the same size as the lightweight precast concrete panel to be connected with the lightweight precast concrete panel, or cut larger than the lightweight precast concrete panel and has a protrusion at one side of four sides, two protrusions at opposite sides, three protrusions at three sides except one side, or four protrusions at all sides to be connected with the lightweight precast concrete panel. It is to increase reinforcing effect by connecting the adjacent composite panels through the composite panel of FIGS. 1 a  and  1   b . It will be appreciated that another precast concrete panel using a general aggregate may be used instead of the lightweight precast concrete panel  550 .  
     [0045] The steel plate  510  is one of steel plates, which has good flexural strength and is generally used in steel plate reinforcing methods, and can be adjusted in thickness according to intensity of the concrete body to be reinforced. That is, because the steel plate  510  is reinforced with the reinforced fiber  530 , which has excellent tension strength and elasticity coefficient, laminated steel plates of 1 mm or less can be used. Furthermore, in case that an anchor fixing, injecting and adhering type reinforcing method is applied in consideration of a construction method (adhering type or anchor fixing, injecting and adhering type) of the composite panel, the steel plate  510  may have a plurality of anchor holes  511 .  
     [0046] The impregnable adhesion layer  520 ′ is formed by coating impregnable adhesive on the upper surface of the steel plate. For the impregnable adhesive, resin for the exclusive use of impregnation and adhesion, such as epoxy resin for impregnation and adhesion, which has good adhesive force to the steel plate and good strength and in which the reinforced fiber is easily impregnated, is proper.  
     [0047] The impregnable adhesion layer  520  serves to coat the surface of the steel plate  510  to prevent corrosion of the steel plate  510  and improve acid-proof property.  
     [0048] The reinforced fiber  530  is mounted on the upper surface of the steel plate  510  and impregnated and adhered by the impregnable adhesion layer  520 ′ to reinforce the steel plate  510 . The reinforced fiber is made by selecting and composing at least one or more of carbon fiber, glass fiber and aramide fiber, which have high tension strength, good elasticity coefficient and durability. Furthermore, it will be appreciated that the reinforced fiber  530  can be laminated into several layers according to required strength of the concrete body to be reinforced. When the reinforced fiber  530  is stacked into several layers, the steps of forming the impregnable adhesion layer  520 ′ and impregnating and adhering the reinforced fiber  530  are repeated while a worker pays attention to remove bubbles for perfect impregnation. The steel plate  510  serves to reinforce against bending or shearing, and the reinforced fiber  530  serves to reinforce tension of the steel plate to correspond to high tension force, and thereby the concrete body to be reinforced can be completely reinforced against the bending, shearing and tension and prevent brittle break of the concrete body due to lack of softness, which is one of main disadvantages of the conventional reinforcing method using the reinforced fiber. Therefore, the composite panel according to the present invention can secure safety sufficiently.  
     [0049] The powder  540  is sprayed, impregnated and adhered on the surface of the impregnable adhesion layer  520 ′ before the impregnable adhesion layer  520 ′ is hardened. The powder  540  increases the adhesive force with the adhesion resin by making the surface of the composite panel rough, thereby helping the composite panel to be integrated with the concrete body.  
     [0050]FIG. 3 illustrates a sectional view of another detailed example of a composite panel for reinforcing a concrete body according to the present invention, and FIG. 4 illustrates a flow chart showing a manufacturing method of the composite panel of FIG. 3. In FIGS. 3 and 4, a precast concrete panel is applied to increase a fireproof property of the composite panel  560 . The composite panel includes: a precast concrete panel  550  of a prescribed size; an adhesion layer  520  formed on an upper surface of the precast concrete panel  550 ; a steel plate  510  mounted on the upper surface of the precast concrete panel  550  and adhered by the adhesion layer  520 ; an adhesion layer  520  formed on an upper surface of the steel plate  510 ; and powder  540  sprayed on the upper surface of the steel plate  510  and adhered by the adhesion layer  520 .  
     [0051] The steel plate  510  is the same as the first example, and the adhesion layer  520  is to adhere the steel plate  510  and the precast concrete panel  550  to each other. The steel plate  510  is formed by coating epoxy resin for adhesion. The precast concrete panel  550  serves to reinforce by being adhered with the steel plate  510  by the adhesion layer  520 , and forms a finish surface when finished composite panel  562  is applied as a panel for reinforcing the concrete body. Because the precast concrete panel  550  is made of the same material as the concrete body to be reinforced and forms a surface cover of the steel plate  510 , it is still better in fireproof than the panel, which consists of the steel plate and the reinforced fiber, and has a good finishing effect. Because the lightweight and fireproofing properties are important factors of the reinforcing panel, it is more effective to use the lightweight precast concrete panel  550 .  
     [0052]FIG. 5 illustrates a schematic view of a manufacturing process and a structure of the precast concrete panel  110  formed by impregnating a lightweight concrete layer  111 , an inorganic element group fiber sheet layer and a water soluble cement group or polymer group resin layer.  
     [0053] The lightweight concrete layer  111  is poured after made by mixing cement, inorganic group porous lightweight aggregate and water using an electrical hand mixer or a mortar mixer.  
     [0054] The inorganic porous lightweight aggregate is mixed with cement to be used as the aggregate and lightweight. According to conditions applied to the panel, the mixed rate of the cement and the inorganic porous lightweight aggregate can be changed. In case that the inorganic porous lightweight aggregate is perlite, the mixed rate of the cement to the inorganic porous lightweight aggregate is within the range of 5%˜80% by weight and the panel can be adjusted within the range of the mixed rate in consideration of the required strength and heatproof property of the panel. The panel generally has proper fireproof property and strength within the mixed rate of about 20%.  
     [0055] The inorganic group fiber sheet layer  112  is a reinforced inorganic group fiber mesh (it is made in such a manner that inorganic group fiber is impregnated into thermosetting synthetic resin and silica sands or blast furnace steel slag are scattered evenly and then hardened), and located within the lightweight concrete layer  111 . The inorganic group fiber sheet layer  112  serves to reinforce tension force of the lightweight concrete panel  110  and can form one layer or several layers. However, in the inorganic group fiber sheet layer  112 , if the inorganic group fiber sheet alone is contained in the panel  110 , an upper layer and a lower layer of the panel  110  are exfoliated and separated from the inorganic group fiber sheet layer  112 . Therefore, if the reinforce inorganic group fiber sheet is mounted, the exfoliation and separation can be prevented. The micro-cement serves to reinforce the inorganic fiber sheet. However, because the micro-cement drops adiabatic effect of the panel, fine powder of the inorganic group porous lightweight aggregate is impregnated to reinforce the adiabatic effect of the panel. When the micro-cement and the inorganic group fiber sheet impregnated in the inorganic group porous lightweight aggregate are impregnated into the concrete panel, water soluble cement group, polymer cement group or polymer group resin is a basal plate.  
     [0056] The panel  110  made through the above process goes through a natural cure and a forced cure (steam cure) in order, and then the lightweight precast concrete panel  110  is finished.  
     [0057]FIG. 6 illustrates a flow chart of a manufacturing process of another lightweight precast concrete panel  410  having reinforced glass fiber mesh stacked between the lightweight concrete layers  411 .  
     [0058] The lightweight precast concrete panel  410  is finished in such a manner that lightweight aggregate, such as bony coal, and Portland cement are sufficiently mixed according to a proper mixing rate, predetermined amount of water is added, lightweight concrete sufficiently mixed by the mortar mixer is first poured to ⅓ of the thickness of the panel, a reinforced glass fiber mesh is mounted on the surface of the first poured lightweight concrete layer  411 , and instantly, the lightweight concrete is second poured and cured (natural cure and steam cure). At this time, the reinforced glass fiber mesh is manufactured in such a manner that a glass fiber mesh  412  for reinforcement is impregnated into synthetic resin and silica sands or blast furnace steel slag are scattered evenly and hardened. The glass fiber mesh  412  is in the form of a net having wider intervals between fibers than general fiber sheet, and reinforces bending and tension force of the lightweight concrete. The silica sand or blast furnace steel slag  430  serves to improve adhesive force between the reinforced glass fiber mesh  412  and the lightweight concrete  411 . Therefore, the lightweight precast concrete panel  410  according to the present invention has completely integrated components, and thereby the glass fiber mesh  412  is stably fixed inside the lightweight concrete to maximize tension force and improve durability of the panel. Moreover, to manufacture a thicker panel, it is preferable to stack wire meshes or reinforced steel bars inside the lightweight concrete  411 . The lightweight fireproof precast panel  410  can be utilized to make a composite reinforced panel by composing the lightweight precast panel  410  and other materials (the existing reinforced fiber (carbon fiber, glass fiber, aramide fiber, and so on) impregnating panel, prestressed reinforced fiber composite panel manufactured using a prestress method) like a reinforced fiber for impregnation, which will be described later, to show the fireproof property. Furthermore, The lightweight fireproof precast panel  410  can be utilized when it is needed to improve fireproof efficiency of the concrete body, which is reinforced through the reinforcing method using the existing carbon fiber sheet, glass fiber sheet or aramide fiber sheet or when it is needed to reinforce due to gradually reduced reinforcing effect. Additionally, the lightweight precast panel  410  can be utilized as a method for protecting and repairing surface of the concrete body by providing beautiful appearance to the concrete body, which has bad outward appearance due to material difference between the concrete body and the fiber sheet or due to aging of the concrete body.  
     [0059] There is a method for repairing and reinforcing the concrete body using the lightweight fireproof precast panel  410 . The method is to cut the lightweight fireproof precast panel in a proper size (in the same size as or larger than the conventional tile) and compress and adhere it to the surface of the concrete body, which is reinforced through the reinforcing method using the existing carbon fiber sheet, glass fiber sheet or aramide fiber sheet, or to the surface of the severely aged concrete body with synthetic resin group adhesive or polymer cement for adhesion.  
     [0060] The method will be described in more detail hereinafter.  
     [0061] Dust and foreign matters attached on the existing basal plane are completely removed through a high pressure washer or a dust collector while the worker pays attention not to damage the reinforced fiber attached on the basal plane, and then, the worker checks flaws of portions where the existing reinforced fiber is adhered, such as bubble, poor adhesion and exfoliation, and performs the reinforcing work. If the portions where the existing reinforced fiber is adhered are finish-coated with epoxy group or aqueous and oil group, very low viscosity epoxy group adhesive is coated, and at the same time, powder such as silica sand is sprayed on the coated surface to make the surface rough. If the portions where the existing reinforced fiber is adhered are finish-coated with urethane group, urethane group adhesive is coated.  
     [0062] After that, the panel is adhered, and from this step, the adhering method using synthetic resin group adhesive and the adhering method using polymer cement group adhesive are performed differently from each other. The adhering method using synthetic resin group adhesive is finished by adhering the panel and filling up joints. The epoxy or urethane group adhesive of high viscosity being in the form of grease is coated and adhered on the surface of the surface of the concrete body, on which the coated adhesive is completely hardened, and the surface of the lightweight precast panel in thickness of about 3˜5 mm evenly. After that, the worker makes joints within 30 minutes after adhering the panel and sprays aggregate such as silica sands into the joints to make the surface rough, and then performs pointed joint work. At this time, the epoxy resin for adhesion can be used by mixing fine aggregate or fine lightweight aggregate. Material for filling up the joints is synthetic resin or the existing compound cement mortar, and a width of the joint is about 5 mm. If the width of the joint is over 5 mm, the worker fills up the joint twice while pressing sufficiently to prevent cracks.  
     [0063] The adhering method using the polymer cement group adhesive is finished by plastering mortar on the basal plane, adhering the panel and filling up the joints. When the worker plasters the mortar on the surface of the concrete body, on which the coated adhesive is completely hardened to make the surface rough, the worker performs the plastering work while paying attention not to exceed 10 mm at once when the plastered thickness exceeds 10 mm. After the mortar plastering work is finished, the plastered surface is cured for a week. The worker checks and repairs excitation and cracks of the mortar plastered surface before adhering the panel. In case of an exterior construction, the worker sprays water on the surface of the panel and completely contacts the panel to the surface of the concrete body to prevent permeation of rain or water, to increase adhesive force and prevent exfoliation, freeze and fusion. A once plastered area of the basal mortar plastered surface is less than 1.0 m 2 . The panel is adhered after adhesive mortar is plastered in thickness of about 3˜6 mm evenly. After the adhesive mortar is plastered again in thickness of about 3˜4 mm evenly, instantly tiles are adhered, and at this time, the worker strikes the tiles with a wood hammer to make the mortar protrude over ½ of the thickness of the panel at the joint portions. After the lapse of 3 hours after the adhesion of the panel, the worker digs the joints and performs the plaster joint work. Before the plaster joint work, the worker sprays water on the basal plane of the joints to maintain moisture. Preferably, the width of the joint is about 5 mm, but, if the width of the joint is over 5 mm, the worker fills up the joint twice while pressing sufficiently to prevent cracks.  
     [0064]FIG. 7 illustrates a state that the reinforced fiber sheet  120  as reinforcing means for the concrete body is connected to the lightweight precast concrete panel  110 . In other words, the reinforcing means includes: the reinforced fiber sheet  120  and powder layer. The reinforced fiber sheet is impregnated based on thermosetting resin coated on the surface of the lightweight precast concrete panel  110  and thermosetting resin  123 , and cut in the same size as the lightweight recast concrete panel  110  and jointed to the lightweight precast concrete panel  110 , or cut larger than the lightweight precast concrete panel  110  and jointed to the lightweight precast concrete panel  110  to protrude. The powder layer is sprayed on an upper portion of the reinforced fiber sheet layer impregnated to increase the adhesion force to the concrete body to be reinforced. The thermosetting resin  123  may be one of epoxy resin or converted epoxy resin. The reinforced fiber sheet layer is formed on the upper surface of the lightweight precast concrete panel while stacked in at least one or more layers. That is, after the impregnable adhesive is coated on the upper surface of the panel, the reinforced fiber sheet layer is finished by impregnating and adhering the reinforced fiber sheet on an upper surface of the impregnable adhesive in one layer or several layers. The reinforced fiber sheet is made by selecting and composing at least one or more of carbon fiber, glass fiber and aramide fiber, which have high tension strength, good elasticity coefficient and durability. Furthermore, to stack the reinforced fiber sheet in at least one or more layers, the steps of coating the impregnable adhesive and impregnating and adhering the reinforced fiber sheet are repeated while the worker pays attention to remove bubbles for perfect impregnation.  
     [0065] The composite reinforced panel consisting of the lightweight precast concrete panel, the reinforced fiber sheet layer and the powder is adhered on the concrete body by an adhering method using anchors. For this, the composite reinforced panel has a plurality of anchor holes. In case that the reinforced fiber sheet layers are stacked in several layers, the reinforced fiber sheets are cut to have different extension lengths from each other. Preferably, the extension lengths of the stacked reinforced fiber sheets are gradually shortened upward. The powder is sprayed and adhered on the surface of the reinforced fiber sheet layer before the reinforced fiber sheet layer is completely hardened. The powder makes the surface of the composite reinforced panel rough, thereby increasing adhesive force with adhesive resin during construction to help the composite reinforced panel to be integrated with the concrete body. The powder may be silica sand or blast furnace steel slag. In case that the reinforced fiber sheet layers are stacked into several layers, the reinforced fiber sheets  120  must be stacked in the same weaving direction to maximize the tension force. For means for reinforcing capacity of the concrete body, thermosetting resin mortar may be coated instead of primer, thermosetting resin and the reinforced fiber sheet. The composite reinforced panel consisting of the lightweight precast concrete panel, the reinforced fiber sheet layer and the powder is adhered on the concrete body by an adhering method using anchors. For this, the composite reinforced panel has a plurality of anchor holes.  
     [0066]FIG. 8 illustrates a schematic and perspective view of a lightweight precast concrete composite reinforced panel  310  for repairing the concrete body, the panel including a lightweight concrete layer  311  and reinforcing means  312  for reinforcing the lightweight concrete layer  311 . The lightweight precast concrete composite reinforced panel  310  differs from the lightweight precast concrete composite reinforced panel  110  of FIG. 5 in the reinforcing means  120 .  
     [0067] First, the lightweight precast concrete composite reinforced panel  310  including the reinforcing means  312  connected at a side of the lightweight concrete layer  311  is made in such a manner that epoxy resin for high strength mortar and hardening agent are mixed with each other, the mixture is mixed with silica sand aggregate in a prescribed rate, and the mixture is poured on the lightweight concrete layer  311  cured by forced steam.  
     [0068] The lightweight precast concrete composite reinforced panel  310  having the lightweight concrete layer  311  containing the reinforcing means  312  therein can divide the lightweight concrete layer into an upper lightweight concrete layer and a lower lightweight concrete layer, and the reinforcing means  312  forms boundary parts between the upper lightweight concrete layer and the lower lightweight concrete layer. Moreover, the lightweight precast concrete composite reinforced panel  310  can be formed in two types: one being that the lightweight concrete layer  311  is formed in a previously poured and cured panel type and connected with the reinforcing means  312 ; and the other being that the reinforcing means  312  is impregnated before the lightweight concrete layer  311  is hardened after being poured, and then, concrete is poured again to connect the reinforcing means  312  with the lightweight concrete layer  311 . The lightweight concrete layer  311  may be replaced with the generally used high strength concrete layer if necessary.  
     [0069] As described above, the lightweight precast concrete composite reinforced panel  310  according to the present invention can be sorted by the reinforcing means  312 . The reinforcing means  312  is selected from one of prepreg one-way carbon fiber, extra thin two-way woven carbon fiber, aramide fiber, glass fiber, a wire net, a wire mesh and a steel bar, and connected between the upper and lower lightweight concrete layers  311  by impregnated by means of epoxy resin and hardening agent. The manufacturing process will be described in more detail.  
     [0070] According to the width and the depth of a damaged portion  383  of the concrete body, a frame is manufactured and a special film is attached on the surface of the frame. One of Portland cement, back cement and color cement, lightweight aggregate, such as perlite, filite, celite, ALC aggregate and ALC crusher run aggregate, and water are mixed, and the mixture is poured and hardened on the frame to make a panel form, and thereby the upper and lower lightweight concrete layers  311  are formed. Epoxy resin for impregnation and hardening agent are mixed in a prescribed mixing rate and the mixture is coated on a side of the lower lightweight concrete layer thin. After the epoxy resin is coated, one of the prepreg one-way carbon fiber, extra thin two-way woven carbon fiber, aramide fiber and glass fiber is impregnated into the epoxy resin. Bubbles generated during the impregnation are removed, and epoxy resin for upper impregnation is coated again. After the epoxy resin for the upper impregnation is coated, the upper lightweight concrete layer is connected, and thereby the lightweight precast concrete composite reinforced panel  310  is formed. Alternatively, the lightweight precast concrete composite reinforced panel  310  can be formed by impregnating one of the glass fiber mesh, wire mesh and steel bar in a condition that the lightweight concrete layer  311  is not hardened, and instantly pouring the upper lightweight concrete layer. Furthermore, a general concrete panel may be formed and used by using a general stone aggregate instead of lightweight aggregate of the lightweight concrete layer. Moreover, it is possible that the lightweight precast composite panel or the precast concrete composite panel is manufactured larger than a portion of the concrete body to be repaired and the lightweight precast composite panel or the precast concrete composite panel is cut corresponding to the portion to be repaired with a hand cutter.  
     [0071] Because the lightweight precast concrete composite reinforced panel  310  is light and easy in construction but uses lightweight aggregate, it has a limit in its strength. If the portion of the concrete body  380  to be repaired requires prescribed compression strength, a precast concrete composite reinforced panel  314  can be applied. The precast concrete composite reinforced panel  314  includes the reinforcing means  312  formed and connected between the upper and lower concrete layers  315  and the upper and lower concrete layers  315 . As described above, the concrete layer  315  is formed by mixing generally used aggregate, cement and water, and the cement is selected from one of Portland cement, back cement and color cement. The upper and lower concrete layers  315  can be connected with the reinforcing means  312  in a previously poured and hardened panel type. Alternatively, the upper and lower concrete layers  315  can be formed in such a manner that the reinforcing means  312  is impregnated before the lower concrete layer is hardened after it is poured, and the upper concrete layer is poured again. The reinforcing means  312  of the precast concrete panel, to which the previously poured and hardened upper and lower concrete layers of the panel type are connected, is formed in such a manner that one of extra thin two-way or one-way woven carbon fiber, prepreg one-way carbon fiber, glass fiber and aramide fiber is selected, epoxy resin and hardening agent, which is lower impregnating means, are coated on a side of the lower concrete layer of the panel type, the epoxy resin and hardening agent are coated again as upper impregnating means, and the upper concrete layer of the panel type is connected before the impregnating means is hardened. If the panel reinforcing means is glass fiber mesh, wire or steel bar, the glass fiber mesh, wire or steel bar is impregnated in the lower concrete layer before the poured lower concrete layer is hardened, and then the upper concrete layer is poured. The panel reinforcing means can be formed in such a manner that one of the wire or steel bar is mounted, synthetic resin for high strength mortar and hardening agent are mixed with each other, silica sand aggregate is mixed, and the mixture is poured and connected to the concrete body. To provide stronger connection force to the glass fiber mesh, wire and steel bar, micro-cement paste is plastered and impregnated on the surface of the glass fiber mesh, wire or steel bar. To increase the strength of the precast concrete panel, the panel is forcedly cured after the lapse of prescribed time after the hardening.  
     [0072]FIGS. 9 and 10 illustrate an elevation view and a sectional view of an anchor for adjusting and injecting the level of the panel according to the present invention. The anchor includes a body part  320 , a nut  323 , a clip  330  for carrying, and a pipe  340  for injection. The body part  320  has a hollow part  325  and is in the form of a cylinder. The body part  320  includes a male screw  321  formed on an outer circumference, a through hole  324  intersecting with the hollow part  325  at an end thereof, a female screw  333  formed on an inner circumference of the hollow part  325  at the other end thereof, and an angular protrusion  322 . The protrusion  322  may be in the form of a hexagon or an octagon. The male screw  321  formed on the outer circumference of the body part  320  is to engage with the nut  323 . The nut  323  is a rotatable tool connected with the protrusion  322 , and when the body part  320  is rotated, the nut  323  fixed to the panel  310  is moved in a vertical direction of the body part  320 , thereby adjusting the level of the panel  310 . The clip  330  for carrying has a cylindrical part  331  having a female screw  333  formed on an inner circumference thereof, and the female screw  333  is engaged with the male screw  321  of the body part  320 , to which the nut  323  is engaged, thereby serving as a link (to help the carrying of the panel. The pipe  340  for injection is generally in the form of a straw and has a male screw  341  formed at an end thereof. The male screw  341  of the pipe  340  is screwed with the female screw formed on the inner circumference of the protrusion  322  of the body part  320 . Filler is injected into an empty space of a rear surface of the panel through the pipe  340 , the hollow part  325  and the through hole  324  of the body part. When the injection of the filler is finished, the pipe  340  is removed.  
     [0073]FIG. 11 illustrates an elevation view and a partially sectional view of an insert  210  and an expanding tool  220  of a multi-purpose anchor for connecting the panel to the concrete body. The insert  210  has a body part  210  being generally in the form of a cylinder and a plurality of holes  212  formed in the body part  211 . The holes  212  formed in the body part  211  of the insert  210  serves as injection paths of the filler injected through an injection pipe  240  and as air discharge paths for discharging air between the panel and the concrete body. The body part  211  has a female screw  213  coupled with a bolt  230  inserted into a prescribed depth from an end. At the end where the female screw  213  is started, formed is a head part  214  protruding from the body part  211  and serving as a spacer. The head part  214  allows the panel connected with the anchor of the present invention to be maintained at a prescribed interval from the concrete body. Because the interval between the panel and the concrete body is determined according to the thickness of the head part  214 , the thickness of the head part  214  is changed according to the interval between the panel and the concrete body. It will be appreciated that the head part  214  may have various shapes besides the shape of FIG. 11. The other end of the insert  210  is split into several sections to be spread when the expanding tool  220  is struck with a striker.  
     [0074] The expanding tool  220  is inserted into the insert  210  after the insert  210  is inserted into the hole formed in the concrete body, and thereby the diameter of the insert is enlarged and the concrete body and the insert  210  are jointed. To make the above operation smooth, a hollow part  221 , which has a vertical section of a trapezoidal cylinder shape and in which the injection pipe  240  is inserted, is formed.  
     [0075]FIG. 12 illustrates an elevation view and a sectional view of the bolt  230  and the injection pipe  240  of the present invention (multi-purpose anchor). The bolt  230  includes a body part  231  and a head part  232 . The bolt  230  has a hollow part  235  vertically passing the body part  231  and the head part  232  to allow insertion of the injection pipe  240 . The body part  231  has a male screw  233 , which is formed on the surface thereof and engaged with the female screw  213  of the insert  210 , and a plurality of holes  236  serving as injection paths of the filler and as inside air discharge paths. The hollow part  235  vertically passing the center of the head part  232  has a female screw  234 , which is formed on an inner circumference and engaged with the injection pipe  240 . The screwing engagement between the head part  232  and the injection pipe  240  may be substituted with other coupling means having the same capacity. The hollow part  221  of the expanding tool  220  and the hollow part  235  of the bolt  230  have the same diameter, and thereby they are extended by coupling the bolt  230  and the insert  210 .  
     [0076] The injection pipe  240 , which is generally in the form of the straw, includes a head part  241  and a body part  243 . The body part  243  has a diameter to the extent that the body part  243  can be inserted into the hollow part  221  of the bolt  230  and the expanding tool  220 , and has a male screw  244 , which is formed on an outer circumference of an end thereof, coupled with or separated from the head part  241 . The injection pipe  240  receives the filler from the head part  241 . A neck part of the head part  241  is formed concavely to remove the head part  241  by striking the head part  241  with a hammer after the injection of the filler. The head part  241  has a male screw  242  formed on an outer circumference of a lower end to be coupled with the female screw  234  of the bolt  230 , and a female screw formed on an inner circumference to be coupled with the male screw  244  of the body part  243  of the injection pipe.  
     [0077] The multi-purpose anchor can be made of metal material or thermosetting resin. If the anchor is made of thermosetting resin, the anchor is prevented from corrosion, so that the anchor has good outward appearance.  
     [0078] The panel  560 ,  562  for reinforcing the concrete body in bending, shearing and tension by composing the steel plate and reinforced fiber, or the steel pate, the reinforced fiber and the precast concrete maximizes merits of each material and supplements demerits of the materials, thereby securing softness of the panel to prevent the brittle break and stably reinforce the concrete body.  
     [0079] The lightweight concrete composite reinforced panel, in which the reinforcing means is connected to the lightweight concrete panel to reinforce the concrete body and improve the capacity of the concrete body, improves the fireproof property of the reinforcing means impregnated, adhered and composed at the surface of the lightweight concrete panel and provides stable reinforcing effect by effectively protecting the reinforcing means from various bad environments such as sudden weather change.  
     [0080] The panel according to the present invention can be effectively fixed on the concrete body. The panel allows the filler to be injected through the anchor without injection hole, has the prescribed interval formed between the panel and the concrete body, and allows the air to be discharged through the anchor without any air discharge hole while the filler between the panel and the concrete body is injected. The anchor is made of thermosetting resin, so that the anchor is prevented from corrosion.  
     [0081] The lightweight concrete composite reinforced panel can secure uniform impregnation by manufactured through a nonstop manufacturing system in factory. Because the composite panel manufactured in the factory is simply assembled when being constructed in a construction site, causes dropping construction quality can be removed previously and dependence on technique of the workers in the site can be reduced, so that stable and estimated reinforcing effects can be obtained.  
     [0082] The lightweight precast concrete panel  410  can have improved durability to the bending and tension force of the panel by stably fixing and integrating the reinforced glass fiber mesh into the lightweight concrete. Furthermore, The present invention can have good adhesion property to the concrete body by coupling the reinforced fiber sheet for reinforcing the capacity of the concrete body to the lightweight precast concrete panel  410  and the powder is sprayed on the reinforced fiber sheet to treat the surface rough.  
     [0083] The lightweight concrete composite reinforced panel, in which the reinforcing means is connected to the lightweight concrete panel to reinforce the concrete body and improve the capacity of the concrete body, improves the fireproof property of the reinforcing means impregnated, adhered and composed at the surface of the lightweight concrete panel and provides stable reinforcing effect by effectively protecting the reinforcing means from various bad environments such as sudden weather change.  
     [0084]FIGS. 13 and 14 illustrate schematic views showing a state that a lower portion of a beam is reinforced by the lightweight precast concrete composite reinforced panel  100  and a state that a lower portion and a side of the beam are reinforced by the lightweight precast concrete composite reinforced panel  100 . The reinforced fiber sheet is used as the reinforcing means for reinforcing the capacity of the concrete body. As shown in the drawings, the lightweight precast concrete composite reinforced panel  100  is changed in an arranged condition between units of the panel  100  according to the shape and area of the concrete body to be reinforced. To overlap the adjacent panel units and the reinforced fiber sheets  120  and continuously construct, the reinforced fiber sheet  120  is cut and adhered larger than the lightweight precast concrete panel  110 , and thereby the reinforced fiber sheet  120  protrudes in a prescribed length. The protruded length is adjusted in proportion to weight by unit area of the reinforced fiber sheet  120 . For example, if the weight of the reinforced fiber sheet  120  is 200 g, 300 g and 400 g per 1 m 2 , the reinforced fiber sheet  120  is protruded to 20 cm, 25 cm and 30 cm. The units of the lightweight precast concrete composite reinforced panel  100  are connected in such a manner that a side of the panel  100  from which the reinforced fiber sheet  120  protrudes and a side from which the reinforced fiber sheet  120  does not protrude are faced and connected with each other. Therefore, when the lightweight precast concrete panel  110  is cut in the form of the rectangle, the reinforced fiber sheet  120  protrudes from one of the four sides of the lightweight precast concrete panel  110 , from opposite sides, from three sides except one side, or all four sides of the lightweight precast concrete panel  110 .  
     [0085]FIG. 15 illustrates a method for installing the panel to a concrete paved road  380  containing a damaged part  383  using the anchor for adjusting the level of the panel and injecting. In more detail, the worker performs a joint indication work on the damaged road surface and cuts the indicated part with a road surface cutter. The damaged part  383  of the concrete paved road surface is inside a cutting line  381 , and the cutting line, which is a straight line, is at right angles with another cutting line  381 . The cut part is broken by hydraulic pressure or an electric hammer. The epoxy mortar  361  in which synthetic resin of high adhesion force and silica sands are mixed in a prescribed rate is poured into the broken basal surface  388 . At this time, the worker performs a leveling work of the basal surface while forming fine holes of about 10 mm between the epoxy mortar coated surface and the panel. The nut  123  of the anchor is fixed into the anchor hole  313  formed in the panel  310  with synthetic resin adhesive, the body part  320  is screwed with the nut  323 , and the clip  330  is screwed with the body part  320 , and then, the panel  310  is carried and seated on the broken part. After the clip  330  is removed, as described above, the body part  320  is rotated and the level of the panel is adjusted to be consistent with the concrete road surface. Because the nut  323  is fixed, when the body part  320  is rotated, the level of the panel can be adjusted. When the level adjusting work of the panel is finished, gap between the panel and the concrete paved road is sealed, a cylinder  352  for injecting low pressure is mounted at a prescribed location of the sealed part, and the pipe  340  is mounted on the anchor. First, the fine hole of the rear surface of the panel is filled with synthetic resin group filler such as epoxy resin through the injection pipe  340 . To prevent occurrence of non-filled part, the filler is second injected into the fine hole of the rear surface of the panel through a low pressure injection cylinder  352 . When the injection work is finished, depressed parts such as the anchor hole  313  are finished with epoxy mortar.  
     [0086]FIG. 16 illustrates a flow chart of a method for reinforcing the concrete body using a composite panel  560 . At this time, an adhesion type reinforcing method is applied. That is, the reinforcing method includes the steps of: preparing a basal surface  500  of the concrete body to be reinforced; forming an adhesion layers  520  on the basal surface  500  of the concrete body and a surface of the composite panel  560 ; and adhering the composite panel  560  on the basal surface  500  of the concrete body.  
     [0087] If the preparing of the basal surface  500  of the concrete body is finished, anchor holes are formed at ends of the composite panel  560  or in the composite panel  560  at regular intervals. When the anchor holes are formed, dust inside the anchor holes is removed clean and permeable adhesion layer is formed on the surface (epoxy permeable adhesive is coated). The permeable adhesion layer serves to remove fine dust of the basal surface  500 , reinforce weak parts to improve the adhesive force of the composite panel  560 . After the permeable adhesion layer coated on the basal surface  500  is completely hardened, epoxy adhesive for adhering the composite panel  560  is coated thick to about 3 mm or more to form the adhesion layer. The adhesion layer is formed also on a surface of the composite panel  560  and contacted and fixed on the basal surface. When the composite panel  560  is fixed on the basal surface, the worker tights it with an anchor bolt, and thereby the anchor can prevent breakdown of the composite panel.  
     [0088] In case that the composite panels of a prescribed size are continuously installed, for perfect adhesion of connected parts, the steel plates are extended longer than the precast concrete panel, and thereby connection parts  515  are formed. At this time, powder  540  is sprayed on a lower surface of the connection parts  515  to improve adhesive force of the connection parts. If necessary, the anchor can be installed on the connection parts.  
     [0089] If the thickness of the composite panel in which the steel plate and the reinforced fiber are composed is more than 3 mm or the lightweight precast concrete panels are combined, the panels are constructed by a method of injecting and adhering synthetic resin.  
     [0090]FIG. 17 illustrates a method for repairing the concrete body having the damaged part using the lightweight precast concrete composite reinforced panel  310 . The damaged part  383  of the concrete body may be various.  
     [0091] First, if the cause of aging, material separation, neutralization, deterioration, lock pocket and exfoliation is water leakage, the worker set damaged part, forms cutting lines  381  meeting at right angles to each other and performs a cutting work. If an exposed steel bar  384  is corroded, the worker removes rust from the corroded part using a sand grinder for removing rust, and then, coats with anticorrosive using a brush. When the removal of rust and the anticorrosion work is finished, the worker perforates the damaged part using the hammer to form a packer hole for injection. After the perforation work, dust inside the hole is removed, a packer  363  for injection is tightened and fixed, and the worker performs an injection and filling work using a high pressure injector. When coffering levee is injected through the packer  363 , the packer  363  is removed by striking it with hammer, dust on the surface is removed, and wet adhesion type high strength coffering levee  371  is plastered manually or by using a steel trowel. After the lapse of 24 hours after the plastering work, the worker checks whether or not there is water leakage, forms a multi-purpose anchor hole  385  using a hammer drill and removes dust and foreign matters inside the anchor hole  385  using an air pump. The multi-purpose anchor and one of the composite panels  310  for reinforcing the concrete body are installed and the level of the panel is adjusted to remove a surface deviation between the panel and the existing concrete body. The gap between the panel and the concrete body is sealed with inorganic group sealing material. Because the multi-purpose anchor serves as the air discharge hole, the air discharge hole  342  is formed only in the gap of the upper portion of the panel. After the sealing material is hardened, wet adhesion type grout material  372  is injected from the lower multi-purpose anchor upwardly. After the lapse of about 24 hours after the first injection is finished, the second low pressure injection is performed to achieve a perfect filling up. After the lapse of about 24 hours after the second injection, the depressed part around the multi-purpose anchor hole, the portion where the air discharge hole  342  is formed, and polluted surfaces are finished.  
     INDUSTRIAL APPLICABILITY  
     [0092] While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.