Joint treatment method and joint treatment tape

Abstract

Traditionally, in reinforced concrete buildings, heat generated by the chemical reaction of cement during the hardening process of concrete causes the phenomenon of hydration, resulting in "expansion (self-deformation)." As the water in the concrete evaporates over time, the volume of the concrete decreases, causing "shrinkage (self-deformation)" again, and cracks can occur during shrinkage. [Solution] A joint treatment method in which a building is made of reinforced concrete using multiple concrete block bodies 1, multiple structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, a pair of displacement absorbing members 5 having a predetermined thickness in the front and back directions and which deform when subjected to a load are adhered to both the left and right sides of the structural slits 2, and a non-stretchable, flexible composite tape 6 is adhered to the surface side of the displacement absorbing members 5, and the displacement absorbing members 5 deform when subjected to a load caused by vibration of the concrete block bodies 1 on the left and right sides of the structural slits 2, thereby absorbing any misalignment of the composite tape 6.

Description

[Technical Field]

[0001] The present invention relates to a joint treatment method and a joint treatment tape. [Background technology]

[0002] Conventionally, various boards such as gypsum board and calcium silicate board, as well as plywood and asbestos cement board (base board) have been used as base substrates for interior construction work such as the inner walls and ceilings of buildings. The surface of this board is finished by applying or pasting paint, plastering material, wallpaper, wallpaper, etc. The boards vibrate due to the stresses caused by earthquakes, causing strain to concentrate at the board joints, resulting in cracks and swelling on the finished surface. Therefore, a commonly used method is to chamfer the edges of the boards, apply putty to the V-shaped groove created when the two boards are butted together, create a smooth finish, then lay a mesh tape made of glass cloth, fabric, or warif over the joint, and then apply finishing putty over the tape to create a smooth surface (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-288870 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned known example is a method for treating joints in a wall member in which two boards are attached, and this method is based on the premise that the boards themselves do not normally deform during joint treatment. However, in reinforced concrete buildings, when concrete is poured, heat is generated by the chemical reaction of the cement during the concrete hardening process, resulting in the phenomenon of heat of hydration, which causes a change in volume called "expansion (self-deformation)" in the early stages of hardening.As the water in the poured concrete evaporates over time, the volume of the concrete decreases, causing "shrinkage (self-deformation)" again, and cracks can occur during shrinkage. To prevent cracks from occurring in the concrete, the building structure is constructed as a divided structure made up of multiple concrete blocks, with structural slits pre-installed at predetermined intervals at the boundaries between the divided concrete blocks. These structural slits not only improve the earthquake resistance of the building, but also play an important role in dispersing stress during an earthquake and preventing cracks from occurring throughout the wall. In other words, when treating joints in boards that do not deform themselves, the two-dimensional deformation of the flexible tape follows the deformation of the board and hides the joints, but concrete structures, unlike boards, harden through three-dimensional self-deformation caused by changes in volume during the thermal expansion and contraction process, so it is necessary to pour and pour the concrete in blocks in advance to allow for self-deformation due to thermal expansion and contraction and prevent the occurrence of cracks in the concrete blocks; joint treatment methods for boards that do not take into account the self-deformation of concrete cannot handle the structural slits in self-deforming concrete blocks, and there is the issue that cracks will occur in the concealed parts of the structural slits that have been jointed. The present application provides a joint treatment method and joint treatment tape for reinforced concrete buildings made of self-deforming concrete. [Means for solving the problem]

[0005] The invention of claim 1 is a joint treatment method in which a building is made of reinforced concrete using a plurality of concrete blocks 1, a plurality of structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, a pair of displacement absorbing members 5 having a predetermined thickness in the front and back directions and which deform when subjected to a load are adhered to both the left and right sides of the structural slits 2, and a non-stretchable, flexible composite tape 6 is adhered to the surface side of the displacement absorbing members 5, and the displacement absorbing members 5 deform when subjected to a load caused by vibration of the concrete blocks 1 on the left and right sides of the structural slits 2, thereby absorbing any misalignment of the composite tape 6. The invention of claim 2 is a joint treatment method in which a seal primer 16 is adhered to the surface of the wall surfaces 15 on both the left and right sides of the structural slit 2 of a concrete block body 1, and a displacement absorbing member 5 is adhered to the surface side of the seal primer 16. The invention of claim 3 is a joint treatment method in which the composite tape 6 is formed by sequentially overlapping and adhering a stainless steel spring steel strip 13 and a mesh tape 17 at least on the surface of the wall surface 15 of the concrete block body 1. The invention of claim 4 is a joint treatment method in which a seal primer 16 is adhered to a predetermined thickness on the surface of the wall 15 of a concrete block 1 excluding the structural slits 2, a pair of displacement absorbing members 5 are adhered to the surface side of the seal primer 16 so as to sandwich the structural slits 2 from the left and right, stainless steel spring steel strips 13 formed to the same left and right width as the pair of displacement absorbing members 5 are adhered to the surface side of the displacement absorbing members 5, a mesh tape 17 is adhered to the surface of the stainless steel spring steel strips 13 and the surface side of the seal primer 16 so as to extend beyond the surface of the stainless steel spring steel strips 13 on the left and right, an epoxy resin elastic adhesive 18 is applied and filled into the mesh of the mesh tape 17, a predetermined thickness of polymer cement 20 is applied to the surface side of the mesh tape 17, a thin layer of cement 21 is applied to the surface side of the polymer cement 20, and a paint finish agent 22 is applied to the surface side of the thin layer of cement 21. The invention of claim 5 is a joint treatment method in which a displacement absorption member 5, a stainless steel spring steel strip 13, and a mesh tape 17 are laminated in this order in advance to form a composite tape 6, the composite tape 6 is adhered to the surface side of the structural slit 2, an epoxy resin elastic adhesive 18 is applied and filled into the meshes of the mesh tape 17 of the composite tape 6, a polymer cement 20 is applied to the surface side of the mesh tape 17 in a predetermined thickness, a thin cement 21 is applied to the surface side of the polymer cement 20, and a paint finishing agent 22 is applied to the surface side of the thin cement 21. The invention of claim 6 is a joint treatment method in which the displacement absorbing materials 5 are placed on the wall surface 15 side of both left and right ends of the stainless steel spring steel band 13, the surface side ends of the stainless steel spring steel band 13 on the wall surface 15 side are set as surface side starting points 10 of the displacement absorbing materials 5, and the rear side ends of the stainless steel spring steel band 13 on the wall surface 15 side are set as wall side starting points 11, and a pair of displacement absorbing materials 5 are provided on both the left and right sides of the structural slit 2 so that the surface side starting points 10 and the wall side starting points 11 of the displacement absorbing materials 5 are positioned on the same straight line in a plan view, and when the displacement absorbing materials 5 deform under load, the positions of the wall side starting points 11 relative to each surface side starting point 10 swing pendulum-like in the left and right directions starting from the surface side starting points 10, so that the amount of deformation of the displacement absorbing materials 5 and the amount of deformation of the structural slit 2 match, and the displacement of the displacement absorbing materials 5 absorbs the positional misalignment of the concrete block 1. The invention of claim 7 is a joint treatment method in which a building is made of reinforced concrete using a plurality of concrete blocks 1, structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, recesses 25 of a predetermined depth and width are provided in advance in the concrete blocks 1 on the surface side of the structural slits 2, the structural slits 2 are positioned at the center of the left and right of the recesses 25, a pair of displacement absorbing members 5 are adhered to the bottom of the recesses 25 on both the left and right sides of the structural slit 2, stainless steel spring steel bands 13 and mesh tape 17 are adhered to the surface side of the displacement absorbing members 5, and when weight is applied due to vibration of the concrete blocks 1 on the left and right sides of the structural slit 2, the displacement absorbing members 5 deform, and the composite tape 6 composed of the displacement absorbing members 5, stainless steel spring steel bands 13 and mesh tape 17 can absorb any positional misalignment of the structural slits 2. The invention of claim 8 is a joint treatment method in which polymer cement 20 is applied to the surface side of composite tape 6, and displacement absorption member 5, composite tape 6, and polymer cement 20 are placed in recess 25 of concrete block 1. The invention of claim 9 is a joint treatment tape for concealing a building constructed using reinforced concrete construction with a plurality of concrete blocks 1, with a plurality of structural slits 2 provided at predetermined intervals in the exterior or interior walls of the plurality of concrete blocks 1 of the building, and the joint treatment tape is formed by laminating a displacement absorber 5 formed with a predetermined thickness in the front and back directions and a predetermined width in the width direction of the structural slit 2, located on both the left and right sides of the structural slit 2 of the concrete block 1, a stainless steel spring steel strip 13 with a predetermined left and right width located on the surface side of the displacement absorber 5, and a non-elastic mesh tape 17 located on the surface side of the stainless steel spring steel strip 13. The invention of claim 10 is a joint treatment tape in which a composite tape 6 is formed by laminating a displacement absorber 5, a stainless spring steel strip 13 having a predetermined width and positioned on the surface side of the displacement absorber 5, and a non-elastic mesh tape 17 positioned on the surface side of the stainless spring steel strip 13, and a release paper 35 is attached to either or both of the front and back surfaces of the composite tape 6. This is what we have decided. [Effects of the Invention]

[0006] In the invention of claim 1, the building is made of reinforced concrete using a plurality of concrete blocks 1, structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, a pair of displacement absorbing members 5 having a predetermined thickness in the front and back directions and deforming when subjected to a load are adhered to both the left and right sides of the structural slit 2, and a non-stretchable flexible composite tape 6 is adhered to the surface side of the displacement absorbing member 5, and the displacement absorbing member 5 is configured to deform when a load is applied due to vibration of the concrete blocks 1 on the left and right sides of the structural slit 2, thereby absorbing the positional deviation of the composite tape 6. When weight is applied, the displacement absorption member 5 deforms, and in a plan view, the wall-side starting point 11 of the displacement absorption member 5, which was positioned in the same straight line as the surface-side starting point 10, moves left and right like a pendulum, and the composite tape 6, which is originally made of a non-elastic material, becomes able to deform vertically and horizontally by the thickness of the displacement absorption member 5 between the stainless steel spring steel band 13 and the wall surface 15, absorbing the deformation (positional displacement) of the concrete block 1.The two-stage synergistic action of this freely deformable displacement absorption member 5 and the composite tape 6, which is a non-elastic flexible material, absorbs the positional displacement of the concrete block 1 and prevents the occurrence of cracks. In the invention of claim 2, a seal primer 16 is adhered to the surface of the wall surface 15 on both the left and right sides of the structural slit 2 of the concrete block body 1, a displacement absorbing member 5 is adhered to the surface side of the seal primer 16, and the seal primer 16 is provided on the wall surface 15 side of the displacement absorbing member 5, thereby providing a base treatment that smooths out unevenness caused by tiny voids (pores) on the wall surface 15 of the concrete block body 1, smoothing the adhesive surface on the wall side of the displacement absorbing member 5 and strengthening the adhesion. In the invention of claim 3, the composite tape 6 is formed by overlapping the stainless steel spring steel strip 13 and the mesh tape 17 in order from at least the surface side of the wall surface 15, and the non-elastic members of the stainless steel spring steel strip 13 and the mesh tape 17 prevent deformation of the structural slit 2 in the left-right direction (what is called "opening" by those skilled in the art). In the invention of claim 4, a seal primer 16 is adhered to a predetermined thickness on the surface of the wall surface 15 of the concrete block 1 except for the structural slit 2, a pair of displacement absorbing members 5 are adhered to the surface side of the seal primer 16 so as to sandwich the structural slit 2 from the left and right, a stainless spring steel strip 13 formed to the same left and right width as the pair of displacement absorbing members 5 is adhered to the surface side of the displacement absorbing members 5, a mesh tape 17 is adhered to the surface of the stainless spring steel strip 13 and the surface side of the seal primer 16 so as to protrude from the surface of the stainless spring steel strip 13 on the left and right, an epoxy resin elastic adhesive 18 is applied and filled into the mesh of the mesh tape 17, and a polymer cement 20 is applied to a predetermined thickness on the surface side of the mesh tape 17. The thin cement 21 is applied to the surface side of the polymer cement 20, and the paint finish agent 22 is applied to the surface side of the thin cement 21. This prevents deformation of the structural slit 2 in the left-right direction (what is known as "opening" by those skilled in the art) by the non-elastic members of the stainless steel spring steel band 13 and the mesh tape 17, and the elastic deformation of the epoxy resin elastic adhesive 18 and the polymer cement 20 allows even the two-dimensional composite tape 6 to deform in accordance with the deformation of the three-dimensional structural slit 2, thereby preventing cracks from occurring due to deformation of the structural slit 2. Furthermore, the elastic deformation of the thin cement 21 and the paint finish agent 22, which are applied to a predetermined thickness, can further conceal the deformation of the structural slit 2. In the invention of claim 5, a composite tape 6 is formed by first laminating a displacement absorption member 5, a stainless steel spring steel strip 13, and a mesh tape 17 in this order, and then the composite tape 6 is adhered and bonded to the surface side of the structural slit 2, the meshes of the mesh tape 17 of the composite tape 6 are filled with an epoxy resin elastic adhesive 18, a predetermined thickness of polymer cement 20 is applied to the surface side of the mesh tape 17, a thin cement 21 is applied to the surface side of the polymer cement 20, and a paint finish 22 is applied to the surface side of the thin cement 21.As a result, the composite tape 6, which is a non-elastic member, can prevent left-right deformation of the structural slit 2 (what is called ``opening'' by those skilled in the art), and the stretchable and elastically deformable epoxy resin elastic adhesive 18 and polymer cement 20 can deform in accordance with the deformation of the three-dimensional structural slit 2, preventing the occurrence of cracks, and further, the thin cement 21 applied to a predetermined thickness and the paint finish 22 can further conceal the deformation of the structural slit 2. In the invention of claim 6, the displacement absorbing members 5 are arranged on the wall surface 15 side of both left and right ends of the stainless steel spring steel strip 13, the surface side ends of the stainless steel spring steel strip 13 on the wall surface 15 side are set as surface side starting points 10 of the displacement absorbing members 5, and the inner side ends of the stainless steel spring steel strip 13 on the wall surface 15 side are set as wall side starting points 11, and a pair of displacement absorbing members 5 are provided on the left and right sides of the structural slit 2 so that the surface side starting points 10 and the wall side starting points 11 of the displacement absorbing members 5 are positioned on the same straight line in a plan view, and when the displacement absorbing members 5 are deformed under load, the positions of the wall side starting points 11 relative to each surface side starting point 10 swing pendulum-like in the left and right direction starting from the surface side starting point 10, so that the amount of deformation of the displacement absorbing members 5 and the structural slit 2 and the amount of deformation of the displacement absorbing member 5 matches, and the displacement of the displacement absorbing member 5 absorbs any displacement of the concrete block 1. Therefore, in a plan view, the wall-side starting point 11 of the displacement absorbing member 5, which was positioned in the same straight line as the surface-side starting point 10, moves left and right like a pendulum, and the composite tape 6, which is originally made of a non-elastic material, can move vertically and horizontally by the thickness of the displacement absorbing member 5 between the stainless steel spring steel band 13 and the wall surface 15, absorbing any displacement of the concrete block 1. The two-stage synergistic action of the freely deformable displacement absorbing member 5 and the highly flexible composite tape 6 absorbs any displacement of the concrete block 1 and prevents cracks from occurring. In the invention of claim 7, the building is made of reinforced concrete using a plurality of concrete blocks 1, structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, recesses 25 of a predetermined depth and width are provided in advance in the concrete blocks 1 on the surface side of the structural slits 2, the structural slits 2 are positioned at the left and right center of the recesses 25, a pair of displacement absorbing members 5 are adhered to the bottom of the recesses 25 on both the left and right sides of the structural slit 2, stainless spring steel bands 13 and mesh tape 17 are adhered to the surface side of the displacement absorbing members 5, the displacement absorbing members 5 deform when weight is applied due to vibration of the concrete blocks 1 on the left and right sides of the structural slit 2, and the composite tape 6 composed of the displacement absorbing members 5, stainless spring steel bands 13 and mesh tape 17 absorbs any misalignment of the structural slit 2, so the structural slit 2 can be positioned within the recesses 25 provided in the concrete blocks 1, and the composite tape 6 can be positioned within this recess 25, making the surfaces of the left and right concrete blocks 1, including the structural slits (joint portions 3) 2, smooth and creating beautiful joint processing. In the invention of claim 8, polymer cement 20 is applied to the surface side of the composite tape 6, so that the highly elastic polymer cement having an elongation rate of 30% or more can be applied smoothly to the surface of the wall surface 15, and further, since the displacement absorption member 5, composite tape 6 and polymer cement 20 are arranged within the recess 25 of the concrete block body 1, the joint treatment member can be placed within the recess 25, and the concealment treatment of the structural slit (joint portion 3) 2 can be beautifully finished. In the invention of claim 9, the displacement absorbing materials 5 are formed by laminating the displacement absorbing materials 5, which are located on both the left and right sides of the structural slit 2 of the concrete block 1 and have a predetermined thickness in the front and back directions and a predetermined width in the width direction of the structural slit 2, the stainless steel spring steel bands 13 which have a predetermined left and right width and are located on the surface side of the displacement absorbing materials 5, and the non-elastic mesh tape 17 which is located on the surface side of the stainless steel spring steel bands 13.When a load such as an earthquake is applied to the left and right concrete blocks 1, the displacement absorbing materials 5 deform, and the composite tape 6, which is made of a non-elastic material, becomes able to deform vertically and horizontally by the thickness of the displacement absorbing materials 5 between the stainless steel spring steel bands 13 and the wall surface 15, absorbing the deformation (positional displacement) of the concrete block 1, and the two-stage synergistic action of the freely deformable displacement absorbing materials 5 and the composite tape 6, which is a non-elastic flexible material, absorbs the positional displacement of the concrete block 1 and prevents the occurrence of cracks. In the invention of claim 10, a release paper 35 is attached to either or both of the front and back surfaces of the composite tape 6, so that the composite tape 6 can be attached while peeling off the release paper 35, improving workability. [Brief explanation of the drawings]

[0007] [Figure 1] A cross-sectional plan view of a structural slit portion subjected to this joint treatment method. [Figure 2] FIG. 10 is a cross-sectional plan view of a structural slit portion of the second embodiment. [Figure 3] Cross-sectional plan view of the work process. [Figure 4] An image of the decomposed laminated state of the joint treatment material. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a side view of another embodiment of a composite tape. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the accompanying drawings. 1 is a concrete block body of a reinforced concrete building, which is formed by placing rebar of a predetermined shape inside a formwork, and pouring concrete made by mixing aggregates such as cement and gravel into the formwork (Fig. 1).

[0009] For ease of understanding, this embodiment will be described using the example of a concrete block body 1 having a wall surface (vertical surface) 15 that rises perpendicular to the floor surface of a building, while indicating directions such as up / down, left / right, front / back, etc. However, the concrete block body 1 may be any part of a building, such as a floor member or ceiling member, and the configuration of the present invention is not limited by this.

[0010] In reinforced concrete buildings, which are the subject of this invention, when concrete is poured, heat is generated by the chemical reaction of cement during the hardening process, causing heat of hydration, which results in "expansion (self-deformation)," a volume change that occurs in the early stages of hardening. As the water in the poured concrete evaporates over time, the volume of the concrete decreases, causing self-deformation due to shrinkage again, and cracks may occur during shrinkage.

[0011] To prevent cracks in the concrete, structural slits 2 are provided at predetermined intervals in the concrete block body 1 of the building. These structural slits 2 improve the earthquake resistance of the building and also play an important role in dispersing stress during an earthquake and preventing cracks from occurring throughout the wall.

[0012] Conventionally, a wall body is constructed by joining together a plurality of wall materials each having a flat surface, and adhesive joint tapes are known that cover the joints between the wall materials at the joints of the wall body to conceal the joints.

[0013] The adhesive joint tape has an elastic reinforcing paint layer provided on the surface and periphery of the adhesive joint tape, and a finishing paint layer provided from the surface (outside) of the reinforcing paint layer to the entire surface of the wall body.

[0014] However, in conventional wall structures, adhesive joint tape and a reinforcing paint layer are provided at the joints of the wall materials in the wall body, so that no seams appear on the surface of the finishing paint layer. However, because the surfaces of each wall material are formed flat, there is a problem in that the raised areas of the finishing paint layer caused by the adhesive joint tape and the reinforcing paint layer are noticeable and look unattractive.

[0015] Conventionally, various boards such as gypsum board and calcium silicate board, as well as plywood and asbestos cement board (base board) have been used as base substrates for interior construction work such as the inner walls and ceilings of buildings.

[0016] The surface of this board is finished by applying or pasting paint, plastering material, wallpaper, wallpaper, etc.

[0017] When this board is subjected to stress during an earthquake, the vibration load is concentrated at the board joints, causing cracks and blistering on the finished surface.

[0018] Therefore, a commonly used joint treatment method involves chamfering the edges of the boards, applying putty to the V-shaped groove created when the two boards are butted together to create a smooth finish, then layering a mesh tape made of glass cloth, fabric, or warif on top of the joint, and applying a finishing putty on top of the tape to create a smooth surface.

[0019] However, the joint treatment method for wall components consisting of two attached boards is based on the premise that the boards will not normally deform. In reinforced concrete buildings, when concrete is poured, heat is generated during the hardening process by the chemical reaction of the cement, causing hydration heat, which is a volume change that occurs in the early stages of hardening, called "expansion (self-deformation)." Then, as the water in the poured concrete evaporates over time, the volume of the concrete decreases, causing "shrinkage (self-deformation)" again, and cracks can form during this shrinkage.

[0020] To prevent cracks from occurring in the concrete, structural slits 2 are provided at predetermined intervals in the concrete block body 1 of the building. These structural slits 2 improve the earthquake resistance of the building and also play an important role in dispersing stress during an earthquake and preventing cracks from occurring throughout the wall.

[0021] In other words, unlike boards, concrete hardens through self-deformation caused by changes in volume during thermal expansion and contraction, so it is necessary to pour and place the concrete in blocks in advance to allow for self-deformation due to thermal expansion and contraction and prevent cracks from occurring in the concrete blocks.

[0022] Therefore, the joint treatment method for structural slits 2 in reinforced concrete buildings cannot be the same as that for boards that do not assume the self-deformation of concrete, and a separate, different joint treatment method must be developed for structural slits 2 in self-deforming concrete blocks.

[0023] Therefore, in the present invention, a building is made of reinforced concrete using a plurality of concrete block bodies 1, and a plurality of structural slits 2 are provided at predetermined intervals in the outer or inner wall of the building, A pair of displacement absorbing members 5, which have a predetermined thickness in the front and back directions and deform when subjected to a load, are adhered to both the left and right sides of the structural slit 2, and a non-stretchable, flexible composite tape 6 is adhered to the surface side of the displacement absorbing members 5, so that the displacement absorbing members 5 deform when subjected to a load caused by the vibration of the concrete block bodies 1 on the left and right sides of the structural slit 2, thereby absorbing any misalignment of the composite tape 6.

[0024] Therefore, when a load such as an earthquake is applied to the left and right concrete blocks 1, the displacement absorption members 5 deform, and in a plan view, the wall-side starting point 11 of the displacement absorption members 5, which were aligned in the same line as the surface-side starting point 10, moves left and right like a pendulum (Figure 5). The composite tape 6, which is originally made of a non-elastic material, becomes able to deform three-dimensionally, vertically and horizontally, by the thickness of the displacement absorption member 5 between the stainless steel spring steel band 13 and the wall surface 15. Although the composite tape 6 is originally a non-elastic flexible material that can only deform in two dimensions, the presence of the displacement absorption members 5 makes it possible for it to deform three-dimensionally, absorbing the deformation (positional misalignment) of the concrete block 1. The two-stage synergistic action of the freely deformable displacement absorption members 5 and the non-elastic flexible composite tape 6 absorbs the positional misalignment of the concrete block 1 and prevents cracks from occurring.

[0025] Furthermore, a seal primer 16 is adhered to the surface of the wall surfaces 15 on both the left and right sides of the structural slit 2 of the concrete block body 1, and a displacement absorbing member 5 is adhered to the surface side of the seal primer 16.

[0026] This serves as a base treatment that evens out unevenness caused by minute voids (pores) on the wall surface 15 of the concrete block 1, making it possible to smooth the adhesive surface of the displacement absorbing member 5 on the wall surface side and strengthening the adhesion.

[0027] The composite tape 6 is formed by bonding at least the stainless steel spring steel strip 13 and the mesh tape 17 together in this order from the surface of the wall surface 15 of the concrete block 1 .

[0028] Therefore, the non-elastic members of the stainless steel spring strip 13 and the mesh tape 17 prevent deformation of the structural slit 2 in the left-right direction (what is called "opening" by those skilled in the art).

[0029] Furthermore, a seal primer 16 is adhered to a predetermined thickness on the surface of the wall surface 15 of the concrete block 1 excluding the structural slits 2, a pair of displacement absorbing members 5 are adhered to the surface side of the seal primer 16 so as to sandwich the structural slits 2 from the left and right, stainless steel spring steel bands 13 formed to the same left and right width as the pair of displacement absorbing members 5 are adhered to the surface side of the displacement absorbing members 5, mesh tape 17 is adhered across the surface of the stainless steel spring steel bands 13 and the surface side of the seal primer 16, extending beyond the surface of the stainless steel spring steel bands 13 on the left and right, epoxy resin elastic adhesive 18 is applied and filled into the meshes of the mesh tape 17, polymer cement 20 is applied to a predetermined thickness on the surface side of the mesh tape 17, thin cement 21 is applied to the surface side of the polymer cement 20, and a paint finish 22 is applied to the surface side of the thin cement 21.

[0030] Therefore, the non-elastic members of the stainless steel spring steel band 13 and the mesh tape 17 firmly prevent deformation of the structural slit 2 in the left-right direction (what is known to those skilled in the art as "opening"); and the elastic deformation of the epoxy resin elastic adhesive 18 and the polymer cement 20 allows the two-dimensional composite tape 6 to deform in accordance with the deformation of the three-dimensional structural slit 2, preventing cracks from occurring due to deformation of the structural slit 2. Furthermore, because the polymer cement 20 is applied to the surface side of the mesh tape 17 in a predetermined thickness, the polymer cement 20 absorbs the deformation of the composite tape 6. In addition, the elastic deformation of the thin cement 21 applied to a predetermined thickness and the paint finish 22 can conceal deformation of the structural slit 2 in one layer.

[0031] In addition, the displacement absorption member 5, the stainless steel spring steel strip 13, and the mesh tape 17 are laminated in this order in advance to form the composite tape 6, the composite tape 6 is adhered to the surface side of the structural slit 2, the meshes of the mesh tape 17 of the composite tape 6 are filled with an epoxy resin elastic adhesive 18, a predetermined thickness of polymer cement 20 is applied to the surface side of the mesh tape 17, thin cement 21 is applied to the surface side of the polymer cement 20, and a paint finish 22 is applied to the surface side of the thin cement 21.

[0032] Therefore, the composite tape 6 made of a non-elastic member can prevent deformation of the structural slit 2 in the left-right direction (what is called "opening" by those skilled in the art), and the stretchable and elastically deformable epoxy resin elastic adhesive 18 and polymer cement 20 can deform in response to the deformation of the three-dimensional structural slit 2, preventing the occurrence of cracks, and further, the thin cement 21 applied to a predetermined thickness and the paint finish agent 22 can further conceal the deformation of the structural slit 2.

[0033] In addition, the displacement absorbing materials 5 are placed on the wall surface 15 side of both left and right ends of the stainless steel spring steel band 13, with the surface side ends of the stainless steel spring steel band 13 on the wall surface 15 side being the surface side starting points 10 of the displacement absorbing members 5 and the rear side ends of the stainless steel spring steel band 13 on the wall surface 15 side being the wall side starting points 11, and a pair of displacement absorbing members 5 are provided on the left and right sides of the structural slit 2 so that the surface side starting points 10 and the wall side starting points 11 of the displacement absorbing members 5 are positioned on the same straight line in a plan view, and when the displacement absorbing members 5 deform under load, the position of the wall side starting points 11 relative to each surface side starting point 10 swings pendulum-like in the left and right directions starting from the surface side starting points 10, so that the amount of deformation of the displacement absorbing members 5 and the amount of deformation of the structural slit 2 match, and the deformation of the displacement absorbing members 5 absorbs the positional misalignment of the concrete block 1.

[0034] Therefore, in a plan view, the wall-side starting point 11 of the displacement absorbing member 5 moves left and right like a pendulum, based on the surface-side starting point 10 of the displacement absorbing member 5, which was positioned in the same straight line. The composite tape 6, which is originally made of a non-elastic material, is allowed to move vertically and horizontally by the thickness of the displacement absorbing member 5 between the stainless steel spring steel band 13 and the wall surface 15, absorbing the positional displacement of the concrete block 1. The two-stage synergistic action of this freely deformable displacement absorbing member 5 and the highly flexible composite tape 6 absorbs the positional displacement of the concrete block 1 and prevents the occurrence of cracks.

[0035] In other words, the movement (deformation) of the structural slit 2, which would normally be impossible to follow with the non-elastic composite tape 6, is caused by the displacement of the displacement absorbing member 5, allowing the composite tape 6 to follow the movement of the structural slit 2 and prevent cracks from occurring (Figure 5).

[0036] Therefore, the displacement absorption member 5 can be made of any material, but is formed from an elastic part with self-restoring properties, and is designed to maintain a space of a predetermined volume between the composite tape 6 and the wall surface 15.It will deform when subjected to vibration loads such as those caused by an earthquake, but when this undesirable load is reduced or eliminated, it will elastically restore itself within the space between the composite tape 6 and the wall surface 15.

[0037] In other words, if the structural slit 2 moves to the right in Figure 5 and widens, the width of the structural slit 2 in the concrete block 1 on the opposite side of the structural slit 2 may narrow. In such a case, the displacement absorption member 5, which was once crushed, may elastically recover and return the composite tape 6 to the front side, thereby providing high durability in preventing cracks even against the loads caused by repeated earthquakes.

[0038] The displacement absorbing member 5 may be formed as a foam member using, for example, synthetic resin or the like. The displacement absorbing member 5 is formed from a resilient synthetic resin foam, which is generally called an "elastomer foam" and has elasticity and flexibility, and has the property of returning to its original shape, such as "polyurethane foam."

[0039] Thus, the building is made of reinforced concrete using a plurality of concrete blocks 1, structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, recesses 25 of a predetermined depth and width are provided in advance in the concrete blocks 1 on the surface side of the structural slits 2, the structural slits 2 are positioned at the center of the left and right of the recesses 25, a pair of displacement absorbing members 5 are adhered to the bottom of the recesses 25 on both the left and right sides of the structural slit 2, stainless steel spring steel bands 13 and mesh tape 17 are adhered to the surface side of the displacement absorbing members 5, and when weight is applied due to the vibration of the concrete blocks 1 on the left and right sides of the structural slit 2, the displacement absorbing members 5 deform, and the composite tape 6 composed of the displacement absorbing members 5, stainless steel spring steel bands 13 and mesh tape 17 can absorb any positional misalignment of the structural slits 2.

[0040] Therefore, the structural slit 2 can be positioned in a recess 25 provided in the concrete block 1, and the composite tape 6 can be positioned in this recess 25, making the surfaces of the left and right concrete blocks 1 including the structural slit (joint portion 3) 2 smooth and providing beautiful joint processing.

[0041] Furthermore, polymer cement 20 is applied to the surface side of the composite tape 6 , and the displacement absorbing member 5 , composite tape 6 and polymer cement 20 are placed in the recess 25 of the concrete block 1 .

[0042] Therefore, since the polymer cement 20 is applied to the surface side of the composite tape 6, the polymer cement 20 can be applied smoothly to the surface of the wall surface 15, and since the displacement absorption member 5, composite tape 6 and polymer cement 20 are placed in the recess 25 of the concrete block body 1, the joint treatment member can be placed in the recess 25, and the structural slit (joint portion 3) 2 can be beautifully concealed.

[0043] In addition, a building is constructed using reinforced concrete construction with a plurality of concrete block bodies 1, and a plurality of structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the plurality of concrete block bodies 1 of the building, and the joint treatment tape that conceals these structural slits 2 is formed by laminating displacement absorbers 5 that are formed with a predetermined thickness in the front and back directions and a predetermined width in the width direction of the structural slit 2 and are located on both the left and right sides of the structural slit 2 of the concrete block body 1, stainless spring steel strips 13 that have a predetermined left and right width and are located on the surface side of the displacement absorbers 5, and non-elastic mesh tape 17 that is located on the surface side of the stainless spring steel strips 13.

[0044] Therefore, when a load such as an earthquake is applied to the left and right concrete blocks 1, the displacement absorbing members 5 deform, and the composite tape 6, which is made of a non-elastic member, becomes able to deform vertically and horizontally by the thickness of the displacement absorbing members 5 between the stainless steel spring steel band 13 and the wall surface 15, absorbing the deformation (misalignment) of the concrete block 1.The two-stage synergistic action of this freely deformable displacement absorbing member 5 and the composite tape 6, which is a non-elastic flexible member, absorbs the misalignment of the concrete block 1 and prevents cracks from occurring.

[0045] In addition, the presence of the highly elastic polymer cement 20 on the surface side of the composite tape 6 absorbs positional deviations of the concrete block 1, thereby preventing cracks from occurring.

[0046] In the above case, as mentioned above, concrete expands due to heat immediately after being poured and then shrinks due to drying, so it is preferable to carry out the above-mentioned joint treatment after the concrete of the concrete block 1 has dried and shrunk to a certain extent.

[0047] The concrete block body 1 may be any concrete block body 1, regardless of whether it is an exterior wall or an interior wall of a building.

[0048] A structural slit 2 is provided between adjacent concrete block bodies 1.

[0049] The structural slits 2 are intentional gaps (slits) created between the concrete block bodies 1, and are expected to have a buffering effect between the concrete block bodies 1. When an earthquake occurs, the left and right concrete block bodies 1 are structurally separated left and right, and the presence of the structural slits 2 absorbs the left and right positional misalignment of the left and right concrete block bodies 1, preventing major damage to the building.

[0050] The structural slit 2 is formed long vertically, and the depth of the structural slit 2 (depth from the wall surface 15) can be set arbitrarily in the design. Although not shown in the figure, the structural slit 2 can be formed so as to divide the concrete block 1 into left and right parts, or as shown in Figure 1, it can be formed as a recessed shape with a predetermined depth from the wall surface 15 of the concrete block 1.

[0051] The design and construction of structural slits (joints 3) 2 in reinforced concrete buildings requires strict standards based on the "Structural Slit Design Guidelines" of the Architectural Institute of Japan, and the construction of structural slits (joints 3) 2 must ensure fire resistance while responding to deformation during earthquakes.

[0052] In this case, as architectural terms, structural slit and joint section are meant to be roughly synonymous, with "structural slit" being used as a structural term in design etc., and "joint section" being used in interior processing work etc., but in the present invention, they will be used and explained as synonyms below, but the configuration of the present invention is not limited by this.

[0053] The structural slits 2 separate main structural members such as columns and beams from structural elements such as walls, thereby effectively dispersing the stress acting on the concrete block body 1 during an earthquake.

[0054] [Role of structural slits and design requirements] 1) Ability to follow deformation during earthquakes: It follows the natural deformation caused by shrinkage and expansion of concrete, as well as deformation caused by stress during earthquakes, preventing cracks in the structural slits 2 (joints). 2) Ensuring fire resistance: Suppressing deformation and deterioration of the sealing 27 in the structural slit 2 at high temperatures. 3) Improved durability: Ensure long-term durability that can withstand repeated earthquakes. 1) to 3) are required.

[0055] [Type of stress acting on the slit] The main stresses that occur in the structural slit 2 are as follows: 1) Bending stress: When a force is applied in a direction parallel to the wall surface 15 of the concrete block body 1, deformation stresses in different directions act on both ends of the width direction (horizontal / left-right direction) of the structural slit 2, causing cracks to form near both the left and right sides of the structural slit 2. 2) Shear force: Forces acting perpendicular to the concrete block body 1 (vertical and front-to-back directions) cause vertical and horizontal displacements at the left and right edges of the structural slit 2, which causes local stress concentrations and leads to cracks. 3) Opening and shifting of the structural slit 2: The concrete blocks 1 on both sides of the structural slit 2 are pulled away from each other and move in the direction of the arrow, widening the width of the structural slit 2 and causing cracks. 4) Misalignment of the sealant 27 in the structural slit 2: When the concrete blocks 1 are displaced relative to each other vertically and horizontally, the sealant 27 in the structural slit 2 is deformed, causing cracks.

[0056] [About the joint removal method of this invention] 1) Use of highly elastic polymer cement 20: By using polymer cement 20 containing mortar 30 with high flexibility (elasticity), bending and shear stresses occurring in the structural slit 2 can be dispersed. Ingredients of Polymer Cement 20: Powdered Portland Cement, Silica Sand, and Ethylene Vinyl Acetate (EVA)-Based Redispersible Powdered Resin Mixture: Acrylic acid alkyl ester copolymer emulsion

[0057] 2) Fire resistance is ensured: Although the sealing 27 itself in the structural slit 2 does not have fire resistance, the surface of the sealing 27 is coated with inorganic, highly elastic polymer cement 20, so that fire resistance can be maintained.

[0058] 3) Durable and exclusive materials: Composite Tape 6; Weft: Kevlar® fiber (Kevlar 29) Heat resistant up to 500°C (carbonized) Chemical resistance, weather resistance, weather resistance Alkali-free glass fiber, heat resistant (softens at 845°C) Warp: Alkali-free glass fiber, heat resistant (softens at 845°C) The mesh tape 17 formed in the same manner as above is used, and the mesh tape 17 absorbs deformation of the structural slits 2, thereby preventing cracks from occurring in the thin cement 21 and paint finish 22 on the surface side.

[0059] Therefore, a non-stretchable mesh tape 17 is used as a reinforcing material to prevent deformation (displacement) of the structural slit 2, and the deformation of the structural slit 2 can be absorbed.

[0060] In other words, the shape and volume of the composite tape 6 are maintained by a layer of highly elastic polymer cement 20 applied to the surface side of the mesh tape 17 + epoxy resin elastic adhesive 18 to a constant thickness of approximately 8 to 7 mm, preventing the appearance of defects on the design-related finished surface due to the movement of the composite tape 6.

[0061] When an external force causes displacement of the base of the panel surface 15 acting on the structural slit 2, the displacement is absorbed by the displacement absorbing material 5 in the first stage, and the displacement is absorbed by the pendulum phenomenon between the surface side starting point 10 and the wall side starting point 11 of the displacement absorbing material 5.

[0062] The thickness of the displacement absorbing material 5 may be changed in proportion to the magnitude of the displacement, with a ratio of approximately 1:1 as the standard. Next, in the second stage, the areas where the absorption effect of the displacement in the first stage is exceeded and design defects occur are the above-mentioned surface side starting point 10 and wall side starting point 11, where the highly elastic polymer cement 20 layer spreads out (flats), and if the layer thickness of this highly elastic polymer cement 20 is ensured to be 7 to 8 mm and the elongation rate is made high elasticity of 30% or more, displacement of the structural slit 2 of 2 mm or more can be dispersed.

[0063] 4) The composite tape 6 is a composite of the displacement absorbing material 5, the stainless steel spring steel strip 13, and the mesh tape 17: The composite tape 6 is formed by laminating together three types of components, namely the mesh tape 17, the stainless steel spring steel strip 13, and the displacement absorbing material 5, from the finished surface side.

[0064] This composite tape 6 is integrated with the concrete block 1 to form a wall structure, and the composite tape 6 contracts and expands as a unit (pendulum phenomenon), preventing the occurrence of defects (cracks) in the appearance (design) of the paint finish 22 and efficiently dispersing stress. 5) Epoxy resin elastic adhesive 18: Reinforces the structural slit 2 with high adhesive strength and adhesion while maintaining the flexibility of the composite tape 6.

[0065] 6) Displacement absorption material 5: A pair of displacement absorption materials 5 are provided on the left and right sides of the structural slit 2 so that the upper starting point 10 of the displacement absorption material 5 on the wall surface 15 side at both left and right ends of the stainless steel spring steel band 13 is positioned in the same straight line as the upper starting point 10 of the displacement absorption material 5 and the lower starting point 11 of the wall surface side starting point.When the displacement absorption material 5 is deformed under load, the position of the wall surface side starting point 11 relative to each surface surface side starting point 10 swings left and right like a pendulum, starting from the surface surface side starting point 10.This causes the deformation of the displacement absorption material 5 to absorb the deformation of the structural slit 2 and prevents cracks from occurring in the paint finish 22.

[0066] In other words, when a load such as an earthquake is applied to the left and right concrete blocks 1, and for example, the displacement absorption members 5 are deformed so as to be crushed, the wall side starting point 11 of the displacement absorption members 5, which were positioned in the same straight line in a plan view, moves left and right like a pendulum, based on the surface side starting point 10 of the displacement absorption members 5, and the composite tape 6, which is originally made of a non-elastic member, becomes able to move vertically and horizontally by the thickness of the displacement absorption members 5 between the stainless steel spring steel band 13 and the wall surface 15, even though the left and right width of the composite tape itself does not change, and thus absorbs the positional deviation of the concrete blocks 1.

[0067] This provides a "pendulum" effect of the displacement absorbing member 5, preventing the occurrence of cracks.

[0068] That is, in Figure 5, the concrete block 1 moves a distance T to the right in the direction of the arrow, and the end 17A of the composite tape 6 moves to the right. However, the position of the surface-side starting point 10 of the displacement absorption member 5 remains unchanged, but the wall-side starting point 11 moves to the right like a pendulum, and the thickness of the displacement absorption member 5 is compressed from thickness H to 1 / 2H, and the end 17A of the composite tape 6, whose left and right width remains unchanged, moves a distance T to the right.

[0069] As a result, if there were only the composite tape 6, it would not stretch laterally and would break, but due to the presence of the displacement absorbing member 5, even the two-dimensional composite tape 6 can stretch laterally with ``play'' equivalent to the thickness of the displacement absorbing member 5, and can follow the movement of the concrete block 1.

[0070] Furthermore, the displacement of each member in the space between the wall surface 15 side of the paint finish 22 and the outer surface of the wall surface 15 can be absorbed by the deformation of the displacement absorbing member 5 .

[0071] Therefore, the thickness of the displacement absorbing member 5 is set to a thickness that can absorb the deformation of the self-deforming concrete block 1 made of concrete, which is greater than the change in the joints between the boards, and although it can be arbitrary, in this embodiment it is set to 1 to 3 mm.

[0072] 7) Accommodates expansion and contraction of concrete: Taking into account the effects of concrete expansion rate (0.0005-0.001%) and contraction rate (0.1-0.8%) due to volume change (self-deformation) during the concrete drying and hardening process (shrinkage process), a displacement absorbing member 5 is attached to the composite tape 6.

[0073] Therefore, the physical properties of the material of the displacement absorbing member 5 absorb deformation caused by contraction and expansion of the concrete block 1, minimizing deformation of the structural slits 2 and preventing cracks from occurring.

[0074] 8) Measures against bending stress: By making the width of the stainless steel spring band 13 wider than the left and right width of the structural slit 2, stress concentration on the structural slit 2 is prevented, and cracks in the structural slit 2 are prevented.

[0075] 9) Reduction of shear stress: The structural slits 2 are concealed by mesh tape 17 and the spring structure stainless steel spring steel strip 13.

[0076] Therefore, the shear force is dispersed by the mesh tape 17 and the stainless steel spring strip 13, and the load is distributed evenly over the entire concrete block body 1.

[0077] 10) Dealing with the opening and misalignment of structural slits 2: Kevlar fibers or aramid fibers are woven vertically and horizontally to form mesh tape 17, which is then impregnated with epoxy resin elastic adhesive 18 to form composite tape 6, which is formed into a flexible, foldable sheet, and a seal primer (urethane resin-based primer coating material) 16 formed into a flexible, foldable sheet is applied to the concrete block 1 side of the composite tape 6 to improve adhesion to form a laminated seismic isolation member 24, and a displacement absorbing material 5 is provided on the wall surface 15 side of the laminated seismic isolation member 24 to form a joint treatment method, which conceals the structural slits (joint portions 3) 2, adapts to deformation of the structural slits 2, and achieves long-term durability.

[0078] The above-mentioned structural slit joint elimination method not only provides aesthetic appeal, but also maintains safety and fire resistance during earthquakes, and has the remarkable effect of preventing even minute cracks from appearing on the exterior (design) even in moderate or severe earthquakes.

[0079] This has the effect of preventing defects in the exterior (design) joint-eliminating top finish coating film even if the defect occurrence criteria are exceeded in a moderate earthquake or phase displacement of 1 / 100 or more.

[0080] That is, the present invention provides a remarkable crack prevention effect by forming a composite tape 6 from a displacement absorbing material 5, a stainless steel spring steel strip 13, and a mesh tape 17, and by providing a two-stage prevention structure in which the composite tape 6 is coated with an elastic polymer cement 20 on the surface side and a thick coating of a seal primer 16 on the wall surface 15 side.

[0081] The structural slit 2 is filled with a sealing 27, which is a foamed plastic cushioning material (joint material) obtained by modifying phenolic resin in various ways, foaming and hardening it, for example, a product called "phenol foam."

[0082] A seal primer 16 is provided on the wall surface 15 side of the structural slit 2. The seal primer 16 is formed of, for example, a urethane resin-based primer.

[0083] Therefore, the seal primer 16 prevents the seepage of liquids such as water and alkali from inside the concrete block body 1, strengthens the strength of the concrete block body 1, prevents the migration of glossing agents and the like from the epoxy resin elastic adhesive 18, and improves the adhesion between the epoxy resin elastic adhesive 18 and the displacement absorption member 5 and the seal primer 16.

[0084] A stainless steel spring strip 13 is provided on the surface side of the seal primer 16 .

[0085] A mesh-like reticulated tape 17 is adhered to the surface side of the stainless steel spring steel strip 13. The reticulated tape 17 is formed by weaving warp and weft threads made of glass fiber, aramid fiber, Kevlar fiber, or the like into a mesh shape, and the stitches of the reticulated tape 17 are impregnated and filled with an epoxy resin elastic adhesive 18 to form the reticulated tape 17.

[0086] The mesh tape 17 has a tape adhesive layer formed by immersing the warp and weft threads in a pressure-sensitive adhesive, and polymer cement 20 is applied to the surface side of the mesh tape 17.

[0087] Optionally, a thin cement 21 is applied to the surface side of the polymer cement 20, and a paint finish 22 is further applied to the surface side of the thin cement 21.

[0088] In this case, in the embodiment of Figure 1, a paint finish 22 is applied to the surface side of polymer cement 20, but in the embodiment of Figure 2, a thin cement 21 is applied to the surface side of polymer cement 20, and further, a paint finish 22 is applied to the surface side of thin cement 21; either is acceptable.

[0089] Thus, a displacement absorbing member 5 is interposed between the stainless spring steel band 13 and the wall surface 15 . The displacement absorbing member 5 is a closed-cell and / or open-cell foam member with a thickness of 1 to 3 mm, and has a cross-sectional shape formed into a thin rectangular prism.It is made of a material that deforms when a load greater than a predetermined level is applied, releasing the gas from the cells.

[0090] Therefore, even if the left and right concrete blocks 1 are displaced relative to each other due to self-deformation of the concrete block 1 or an earthquake, etc., causing the structural slit 2 to deform, the displacement absorbing member 5 absorbs this deformation by deforming under the load, suppressing the misalignment of the mesh tape 17, and thereby preventing cracks from occurring near the structural slit 2. In other words, the mesh tape 17 acts as a member to secure the edges of the left and right concrete blocks 1, and the fixing effect of this mesh tape 17 is absorbed by the deformation of the displacement absorbing member 5, thereby absorbing the misalignment of the left and right concrete blocks 1 and preventing the occurrence of cracks.

[0091] In other words, a pair of displacement absorption members 5 formed to a predetermined thickness taking into account the designed displacement amount of the structural slit 2 are provided on both the left and right sides of the structural slit 2 so that, when viewed in a plane, the surface side starting point 10 and the wall side starting point 11 of the displacement absorption member 5 are positioned in the same straight line on the wall surface 15 side of both left and right end ends of the stainless steel spring steel strip 13.

[0092] The displacement absorbing member 5 is installed over the entire vertical height of the wall surface 15 of the concrete block 1 as part of the components of the joint treatment method, and when the structural slit 2 deforms under load, the position of the wall side starting point 11 relative to the surface side starting point 10 of the displacement absorbing member 5 swings vertically and horizontally like a pendulum from the surface side starting point 10, and this deformation of the displacement absorbing member 5 absorbs the deformation of the structural slit 2 caused by the movement of the concrete block 1 and prevents cracks from occurring in the paint finish 22.

[0093] (Operation of the embodiment) The present invention has the above-described configuration and provides the following effects. For ease of understanding, an example of the work sequence will be described below with reference to FIG. Step 1: Form a recess in the concrete formwork for the joint removal area. Concrete is poured into a formwork made of plywood or the like, and a recess 25 is formed above the structural slit 2 in Figure 1, which will become the space K for the joint treatment of the present invention. The recess 25 may be formed by cutting the concrete block 1 after it has been poured.

[0094] The recess 25 is formed to a depth of about 8 to 12 mm and a left-right width of about 120 mm.

[0095] Step 2: Smoothing repair of the recessed base: Apply a cement adhesive enhancer to the inner surface of the recess 25, apply a thin cement coating smooth plaster repair finish, and leave to dry and cure for at least three days.

[0096] Step 3: Joint sealing Yes No Deep joint finishing: Surface - 10mm or more, dry and cure for at least 1 day

[0097] Step 4: A seal primer 16 is applied to the bottom surface of the recess 25, which will be the tape adhesive surface, and the displacement absorbing members 5 are adhesively processed on both the left and right sides of the structural slit 2.

[0098] Step 5: The stainless steel spring strips 13 are adhered to the upper surfaces of the pair of displacement absorbing members 5: The stainless steel spring strips 13 are adhered with strong adhesive double-sided tape.

[0099] Step 6: The composite tape 6 is adhered to the surface side of the stainless spring steel strip 13.

[0100] Step 7: Apply elastic epoxy adhesive 18 to the surface of mesh tape 17 of composite tape 6. For example, use a rotary caulking gun, rubber spatula, and plastic spatula to apply a thick layer of 1 to 2 mm that almost covers the mesh of mesh tape 17 and the edges (edges) of stainless steel spring strip 13, and allow to dry and harden for at least one day.

[0101] Step 8: Apply plastering polymer cement 20, with the application width being approximately 120 mm across the left and right width of the recess 25 that will become the recessed formwork.

[0102] Step 8: Apply thin cement 21 on the polymer cement 20 in the concrete recess 25.

[0103] Step 9: A paint finish 22 is applied onto the thin cement 21 and allowed to dry and cure for at least three days.

[0104] In this way, steps 1 to 9 complete the joint treatment method.

[0105] For ease of understanding, Figure 3 shows a configuration in which the composite tapes 6 are attached separately, but the composite tape 6 may also be formed in advance by laminating the displacement absorbing material 5, the stainless steel spring steel strip 13, and the mesh tape 17, and the three-layer composite tape 6 may then be attached to the structural slit 2.

[0106] The present invention exhibits deformation-following properties during earthquakes, following the self-deformation caused by shrinkage and expansion of concrete and deformation due to stress during earthquakes, and preventing cracks in the structural slits 2 (joints).

[0107] In addition, deformation and deterioration of the sealing 27 in the structural slit 2 at high temperatures are suppressed, ensuring fire resistance.

[0108] It can also withstand repeated earthquakes, ensuring long-term durability.

[0109] Furthermore, the present invention makes it possible to disperse bending and shear stresses occurring in the structural slits 2 by using polymer cement 20 containing mortar 30 with high flexibility.

[0110] Special material: Mesh tape 17 reinforced with aramid fiber is used, and the mesh tape 17 absorbs deformation of the structural slit 2, preventing cracks from occurring in the thin cement 21 and paint finish 22 on the surface side.

[0111] Therefore, mesh tape 17 is used as a reinforcing material for structural slit 2, making it possible to absorb deformation of structural slit 2.

[0112] In other words, when a load such as an earthquake is applied to the left and right concrete blocks 1, the displacement absorption members 5 deform, and in a plan view, the wall-side starting point 11 of the displacement absorption members 5, which were positioned in the same straight line as the surface-side starting point 10, moves left and right like a pendulum, and the composite tape 6, which is originally made of a non-elastic member, becomes able to deform vertically and horizontally by the thickness of the displacement absorption members 5 between the stainless steel spring steel band 13 and the wall surface 15, absorbing the deformation (positional displacement) of the concrete block 1.The two-stage synergistic action of this freely deformable displacement absorption member 5 and the composite tape 6, which is a non-elastic flexible member, absorbs the positional displacement of the concrete block 1 and prevents the occurrence of cracks.

[0113] A stainless steel spring steel band 13 is provided on the surface side of the opening of the structural slit 2, and mesh tape 17 made of stainless steel spring steel band 13 is used as a multi-layer tape, so that the composite tape 6 is integrated with the concrete block 1 to form the wall structure, and the composite tape 6 contracts and expands as a unit, preventing appearance (design) defects (cracks) from occurring in the paint finish 22 and dispersing stress efficiently.

[0114] The vertical and horizontal stitches of the mesh tape 17 are impregnated with an epoxy resin elastic adhesive 18, so the composite tape 6 has high flexibility, and its high adhesive strength and adhesion reinforce the structural slits 2 while maintaining the flexibility of the composite tape 6, and it deforms to follow the positional misalignment of the left and right concrete blocks 1, preventing the occurrence of cracks.

[0115] Furthermore, a pair of displacement absorption members 5 are provided on the left and right sides of the structural slit 2 so that the surface side starting point 10 and wall side starting point 11 of the displacement absorption members 5 are positioned on the wall surface 15 side at both left and right ends of the stainless steel spring steel band 13 with a thickness that takes into account the designed displacement amount of the structural slit 2.When the displacement absorption members 5 are deformed under load, the position of the wall side starting point 11 relative to each surface side starting point 10 swings left and right like a pendulum, starting from the surface side starting point 10, and the deformation amount of the displacement absorption members 5 absorbs the deformation amount of the structural slit 2, preventing the occurrence of cracks in the paint finish 22.

[0116] In other words, when a load such as that caused by an earthquake is applied to the left and right concrete blocks 1, the left and right wall surfaces 15 move away from each other and the structural slits 2 widen, but, for example, the rigidity of the stainless steel spring steel bands 13 supports the moving load of the wall surfaces 15 two-dimensionally, and the high flexibility of the mesh tape 17 and the epoxy resin elastic adhesive 18, together with the crushing deformation of the displacement absorption members 5, causes the wall-side starting point 11 of the displacement absorption members 5, which were positioned in the same straight line in a plan view, to move left and right like a pendulum, based on the surface-side starting point 10 of the displacement absorption members 5. This allows the composite tape 6, which is originally made of a non-elastic member, to move in three dimensions, vertically and horizontally, by the thickness of the displacement absorption members 5 between the stainless steel spring steel bands 13 and the wall surfaces 15, and the high flexibility of the composite tape 6 allows it to adhere tightly to the wall surfaces 15 together with the displacement absorption members 5 in response to deformation of the displacement absorption members 5, and the composite tape 6 and the displacement absorption members 5 work together to absorb any misalignment of the concrete blocks 1.

[0117] This provides a "pendulum" effect of the displacement absorbing member 5, preventing the occurrence of cracks.

[0118] Furthermore, the present invention has the effect of preventing defects in the joint-eliminating top finish coating film from occurring even when the defect occurrence criteria for appearance (design) joints exceed a moderate earthquake and phase displacement of 1 / 100 or more.

[0119] That is, the present invention has a remarkable effect of preventing cracks from occurring, particularly due to the two-stage prevention structure of the displacement absorbing material 5 and the ensuring of the thickness of the polymer cement 18 on the joint filler.

[0120] Figure 6 is a side view of the joint treatment seismic isolation tape (composite tape 6) used when carrying out the joint treatment method of the present invention, in a rolled state before use, and is formed by laminating a displacement absorbing material 5, a stainless spring steel strip 13 with a specified left and right width located on the surface side of the displacement absorbing material 5, and a non-elastic mesh tape 17 located on the surface side of the stainless spring steel strip 13, and a release paper 35 is attached to either or both of the front and back sides of the composite tape 6, and it is used by being attached to the surface side of the structural slit 2 as described above.

[0121] Therefore, the joint treatment seismic isolation tape (composite tape 6) can be applied to the surface side of the structural slit 2 while peeling off the release paper 35 at the work site where the structural slit 2 is located, thereby improving workability.

[0122] Figure 7 is a side view of another embodiment of joint-treated seismic isolation tape (composite tape 6) in a rolled state before use, with release paper 35 attached to both the front (outer surface) and back (inner surface) of the composite tape 6. [Explanation of symbols]

[0123] 1...concrete block body, 2...structural slit, 3...joint portion, 5...displacement absorption member, 6...composite tape, 10...surface side starting point, 11...wall side starting point, 13...stainless steel spring steel strip, 15...wall surface, 16...sealing primer, 17...mesh tape, 18...epoxy resin elastic adhesive, 20...polymer cement, 21...thin cement, 22...painting finish, 24...laminated seismic isolation member, 25...recess, 27...sealing, 30...mortar, 35...release paper.

Claims

1. A joint treatment method in which a building is made of reinforced concrete using a plurality of concrete blocks 1, a plurality of structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, a pair of displacement absorbing members 5 having a predetermined thickness in the front and back directions and which deform when subjected to a load are adhered to both the left and right sides of the structural slits 2, and a non-stretchable flexible composite tape 6 is adhered to the surface side of the displacement absorbing members 5, and the displacement absorbing members 5 deform when subjected to a load caused by vibration of the concrete blocks 1 on the left and right sides of the structural slits 2, thereby absorbing any misalignment of the composite tape 6.

2. 2. A joint treatment method according to claim 1, in which a seal primer is adhered to the surface of the wall surface on both sides of the structural slit of the concrete block, and a displacement absorbing member is adhered to the surface side of the seal primer.

3. 3. The method for treating joints according to claim 2, wherein the composite tape is formed by bonding the stainless steel spring steel strip and the mesh tape in this order at least from the surface of the wall surface of the concrete block.

4. a pair of displacement-absorbing members (5) attached to the surface of the seal primer (16) so as to sandwich the structural slit (2) from the left and right; a pair of stainless spring steel strips (13) formed to the same width as the pair of displacement-absorbing members (5) attached to the surface of the displacement-absorbing members (5); a mesh tape (17) attached to the surface of the stainless spring steel strips (13) and overhanging the surface of the seal primer (16) on the left and right; an epoxy resin elastic adhesive (18) applied to fill the mesh of the mesh tape (17); a polymer cement (20) applied to the surface of the mesh tape (17) to a predetermined thickness; a thin cement (21) applied to the surface of the polymer cement (20); and a paint finish (22) applied to the surface of the thin cement (21).

5. In claim 4, the joint treatment method comprises the steps of: laminating a displacement absorbing member 5, a stainless steel spring steel strip 13, and a mesh tape 17 in this order to form a composite tape 6; adhering and bonding the composite tape 6 to the surface side of the structural slit 2; applying and filling an epoxy resin elastic adhesive 18 into the meshes of the mesh tape 17 of the composite tape 6; applying a predetermined thickness of polymer cement 20 to the surface side of the mesh tape 17; applying a thin layer of cement 21 to the surface side of the polymer cement 20; and applying a paint finish agent 22 to the surface side of the thin layer of cement 21.

6. In claim 1, the displacement absorbing materials (5) are placed on the wall surface (15) side of both left and right ends of the stainless steel spring steel band (13), the surface-side ends of the stainless steel spring steel band (13) on the wall surface (15) side are set as surface-side starting points (10) of the displacement absorbing materials (5), and the rear ends of the stainless steel spring steel band (13) on the wall surface (15) side are set as wall-side starting points (11), a pair of displacement absorbing materials (5) are provided on both the left and right sides of the structural slit (2) so that the surface-side starting points (10) and the wall-side starting points (11) of the displacement absorbing materials (5) are positioned on the same straight line in a plan view, and when the displacement absorbing materials (5) deform under load, the positions of the wall-side starting points (11) relative to each surface-side starting point (10) swing pendulum-like from the surface-side starting points (10) in the left and right directions, so that the amount of deformation of the displacement absorbing materials (5) and the amount of deformation of the structural slit (2) match, and the displacement of the displacement absorbing materials (5) absorbs the positional misalignment of the concrete block (1),

7. In claims 1 to 6, the building is made of reinforced concrete using a plurality of concrete blocks 1, structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building, recesses 25 of a predetermined depth and width are provided in advance in the concrete blocks 1 on the surface side of the structural slits 2, the structural slits 2 are positioned at the left and right center of the recesses 25, a pair of displacement absorbing members 5 are adhered to the bottoms of the recesses 25 on both the left and right sides of the structural slits 2, stainless steel spring steel bands 13 and mesh tape 17 are adhered to the surface side of the displacement absorbing members 5, and the displacement absorbing members 5 deform when weight is applied due to vibration of the concrete blocks 1 on the left and right sides of the structural slits 2, so that the composite tape 6 composed of the displacement absorbing members 5, the stainless steel spring steel bands 13 and the mesh tape 17 can absorb any positional misalignment of the structural slits 2.

8. 8. The joint treatment method according to claim 7, wherein polymer cement is applied to the surface of the composite tape, and the displacement absorbing member, composite tape, and polymer cement are placed in the recess of the concrete block.

9. A building is constructed using reinforced concrete from a plurality of concrete blocks 1, and a plurality of structural slits 2 are provided at predetermined intervals in the exterior or interior walls of the building's concrete blocks 1. The joint treatment tape used to conceal these structural slits 2 is formed by laminating displacement absorbers 5 that are positioned on both the left and right sides of the structural slits 2 of the concrete blocks 1 and have a predetermined thickness in the front and back directions and a predetermined width in the width direction of the structural slits 2, stainless steel spring steel bands 13 that are positioned on the surface side of the displacement absorbers 5 and have a predetermined left and right width, and non-elastic mesh tape 17 that is positioned on the surface side of the stainless steel spring steel bands 13.

10. In claim 9, a joint treatment tape is formed by laminating a displacement absorbing material 5, a stainless steel spring steel strip 13 having a predetermined left and right width located on the surface side of the displacement absorbing material 5, and a non-elastic mesh tape 17 located on the surface side of the stainless steel spring steel strip 13, and a release paper 35 is attached to either or both of the front and back sides of the composite tape 6.

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