Method for repairing cracks in extrusion-molded plates and repair wall covering material

Abstract

To provide a method for repairing cracks in extrusion-molded plates and a repair wall covering material that allow for simple repair operation even while attached as a wall covering material of a building, can reinforce the strength of the extrusion-molded plate, and can suppress the generation of water puddles inside the extrusion-molded plate.SOLUTION: Provided is a method for repairing cracks in an extrusion-molded plate attached as a wall covering material of a building, comprising: a first process of exposing a hollow part provided in the longitudinal direction of the extrusion-molded plate; a second process of forming a path in the longitudinal direction within the exposed hollow part; and a third process of filling an adhesive around the formed path in the hollow part.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for repairing cracks in an extruded panel and a repair wall covering material. [Background technology]

[0002] Extruded boards have been used as wall coverings for architectural structures. In particular, extruded cement boards, which are one type of extruded board, are decorative materials that are easy to install and have the characteristics of being high in strength and excellent in weather resistance.

[0003] In recent years, research and development has been widely conducted on methods for repairing cracks in extrusion-molded panels. For example, Patent Document 1 discloses a method for repairing cracks that occur in the width direction of an extrusion-molded panel that has a pair of substantially parallel rectangular surface panels, a plurality of partition walls extending in the longitudinal direction of the surface panels to integrally connect the pair of surface panels at a predetermined interval, and a hollow portion defined between adjacent partition walls, and that is attached to the framework of a building so that the longitudinal direction is substantially vertical, the method comprising the steps of drilling a hole below the crack in the surface panel, providing a receiving material through the hole in the hollow portion directly below the hole, and injecting and filling mortar into the hollow portion through the hole and allowing it to harden, thereby forming a dense columnar mortar-fixed portion in the hollow portion so as to straddle the crack. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-044034 A

[0005] Extruded boards are suitable for use as exterior wall materials for building structures, but when cracks occur due to aging or other reasons, they may spread not only to the front side but also to the back side, and it is difficult to confirm the cracks. In addition, replacing extruded boards requires modification of the interior surface of the building structure, which is a heavy burden on residents and workers and is not easy.

[0006] Therefore, a method of repairing cracks in extruded panels is to inject mortar or the like into the cracked area to seal the hollow space in the extruded panel and reinforce its strength. However, while this method can reinforce the cracked area, if water pools inside the extruded panel, it cannot drain properly, which can cause the performance of the extruded panel to deteriorate or cause the water to seep out and affect the interior surface, so there is room for improvement. Summary of the Invention [Problem to be solved by the invention]

[0007] The problem that the present invention aims to solve is to provide a method for repairing cracks in an extruded molded plate and a repair wall covering material which can be repaired with simple work even when the plate is still installed as a wall covering material for a building, which can reinforce the strength of the extruded molded plate, and which can prevent the formation of puddles inside the extruded molded plate. [Means for solving the problem]

[0008] The present invention relates to a method for repairing cracks that have occurred in an extruded board installed as a wall covering for a building, the method comprising the steps of: a first step of exposing a hollow portion provided in the longitudinal direction of the extruded board; a second step of forming a path in the longitudinal direction in the exposed hollow portion; and a third step of filling an adhesive around the path formed in the hollow portion. Effect of the Invention

[0009] The method of repairing cracks in an extruded molded panel of the present invention allows the panel to be repaired with simple work even when it is still installed as a wall covering for a building, has the effect of reinforcing the strength of the extruded molded panel, and also prevents the formation of puddles inside the extruded molded panel. [Brief description of the drawings]

[0010] [Figure 1] FIG. [Diagram 2] FIG. 2 is a front view showing a state in which an extrusion molded plate is cut vertically in the longitudinal center to resemble a crack. [Diagram 3] FIG. 4 is a front view showing the state in which the hollow portion is exposed after the first process. [Figure 4] FIG. 13 is a perspective view showing a state in which reinforcement work is performed after the first process and before the second process. [Diagram 5] 13 is a perspective view showing the insertion of a water-conducting material having an axial through hole as part of the second forming step. FIG. [Figure 6] FIG. 11 is a perspective view showing the formation of a substantially torii-shaped water-conducting material in the second process. [Figure 7] FIG. 11 is a perspective view showing a state in which a filling operation in a third step is performed. [Figure 8] FIG. 11 is a perspective view showing a state where reinforcement work is performed after the third process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention is characterized by including a first step of exposing a hollow portion provided in the longitudinal direction of an extrusion molded plate, a second step of forming a path in the longitudinal direction in the exposed hollow portion, and a third step of filling an adhesive around the formed path in the hollow portion.

[0012] The extrusion molded board according to the present invention is mainly made of inorganic materials, such as an extrusion molded cement board made of cement. The shape of the extrusion molded cement board is generally such that two rectangular flat plates are arranged in parallel, the flat plates are connected to each other by a plurality of partitions, and a hollow space is formed between the partitions.

[0013] <First step> In the present invention, as a first step, a removal operation must be carried out to expose the hollow portion provided in the longitudinal direction of the extruded cement board.

[0014] Specifically, for cracks that have occurred in the extruded board, the position of the hollow portion provided in the longitudinal direction of the extruded cement board is identified from drawings, etc., and the flat board portion corresponding to the position of the hollow portion is removed to provide an opening. One method for this is to drill holes in the four corners of the flat board portion, cut the four sides with a grinder from the drilled positions, and remove the flat board portion corresponding to the position of the hollow portion.

[0015] This removal process exposes the hollows that are spaced apart along the length of the mold. After exposing the hollows, any burrs that have formed at the openings are removed, and any shavings are cleaned away, the mold moves to the second process.

[0016] <Second process> In the present invention, a second step is required to form a channel in the longitudinal direction in the exposed hollow portion. This second step ensures a water channel, thereby preventing the occurrence of puddles in the extrusion plate.

[0017] The formation process involves, for example, applying a primer with adhesive properties to a water-conducting material having a through hole in the axial direction, then inserting it into the exposed hollow portion and allowing it to cure for a certain period of time.

[0018] The water conducting material is a tubular material with a circular or polygonal cross-sectional shape, such as a pipe made of organic resin or metal. The length of the water conducting material is preferably equal to or greater than the longitudinal length of the hollow portion exposed in the removal step. In the present invention, the strength of the extrusion plate can be improved by disposing the water conducting material.

[0019] In addition to the water-conducting material with a through hole in the axial direction, the water-conducting material may be a roughly U-shaped water-conducting material or a roughly semicircular water-conducting material that is inserted. By using such a water-conducting material made of one part, the formation work can be easily carried out and it is very economical because it leads to cost reduction.

[0020] Another method of forming the tube is to place two flat plates in the hollow space as shown in Figure 6. The water conducting material may be arranged parallel to the partition wall and a flat plate may be placed on top of the partition wall to form a roughly torii-shaped water conducting material. The flat plate may be made of, for example, organic resin or metal, and may be combined with various adhesives or adhesive tapes.

[0021] In addition, when carrying out the second step, a reinforcement work may be carried out separately. For the reinforcement work, a method may be mentioned in which after the first step is completed and before the second step is started, a primer is applied to the inside periphery of the exposed hollow portion, cured for a certain period of time, an undercoat agent is applied, a fiber sheet is laminated, and a top coat agent is applied for finishing. In particular, by laminating the fiber sheet not only to the inner side of the hollow portion but also to the wall surface of the partition portion, the strength after reinforcement can be further improved.

[0022] As the primer, undercoat agent, and topcoat agent, various paints such as epoxy resin-based, urethane resin-based, urea resin-based, acrylic resin-based, etc., can be used. In addition, the fiber sheet includes an organic fiber sheet and an inorganic fiber sheet, and examples of the organic fiber include carbon fiber, aramid fiber, vinylon fiber, polypropylene fiber, and polyethylene fiber, and examples of the inorganic fiber include glass fiber, rock wool fiber, etc.

[0023] <Third step> In the present invention, as a third step, it is necessary to carry out a filling operation of filling the periphery of the path formed in the hollow portion with an adhesive. By this third step, it is possible to fix the path formed in the above-mentioned second step.

[0024] Specifically, a primer is applied to the water-conducting material and the inside of the exposed hollow portion within the range that an applicator can reach from the opening, and then an adhesive is filled into the hollow portion around the water-conducting material, and the surface of the extruded plate is smoothed and cured for a certain period of time. Examples of adhesives include epoxy resin-based and acrylic resin-based mortars.

[0025] In addition, after the third step, a separate reinforcement operation may be performed. The reinforcement operation may be performed by filling the hollow portion with an adhesive, smoothing the surface, and then repeating the operation performed before the second step. For example, a method may be used in which a primer is applied to the smoothed surface, an undercoat is applied, a fiber sheet is attached, and a topcoat is applied to finish the surface. By repeating the reinforcement operation, the strength after reinforcement can be further improved.

[0026] As the primer, undercoat agent, and topcoat agent, various paints such as epoxy resin-based, urethane resin-based, urea resin-based, acrylic resin-based, etc., can be used. In addition, the fiber sheet includes an organic fiber sheet and an inorganic fiber sheet, and examples of the organic fiber include carbon fiber, aramid fiber, vinylon fiber, polypropylene fiber, and polyethylene fiber, and examples of the inorganic fiber include glass fiber, rock wool fiber, etc.

[0027] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these descriptions. EXAMPLES

[0028] <Example 1> An extruded cement board (manufactured by Aicatec Construction Materials, product name: Mace, Mace is a registered trademark, 600mm x 1300mm x 60mmt) was prepared as a test specimen. The center of the extruded cement board in the longitudinal direction was cut vertically to resemble a crack. This produced two test pieces with a longitudinal length of 650mm. In the first step, two test pieces were butted up against each other, and measurements were taken of 175 mm on each side from the butted part (a total of 350 mm). The removal work was carried out by exposing the hollow part by this length. In the second step, a primer with adhesive properties (product name: Quick Seal JB-919FD30, manufactured by Aica Kogyo Co., Ltd.; Quick Seal is a registered trademark) was applied to a water-conducting material (stainless steel square pipe, length: 400 mm, cross section (outer diameter): 40 mm × 20 mm × 1.5 mmt), and the water-conducting material was inserted into the opening of the exposed hollow part and left to cure for 3 hours, thereby completing the formation work. In the third step, a primer (product name: Joliseal JBX-125, manufactured by Aica Kogyo Co., Ltd.; Joliseal is a registered trademark) was applied to the water-conducting material and the inside of the exposed hollow portion within the range that the application tool could reach from the opening, and then an adhesive (product name: Mace Epo, manufactured by Aica Tech Building Materials Co., Ltd.; epoxy resin-based mortar; Mace Epo is a registered trademark) was filled into the hollow portion, the surface of the extruded plate was smoothed, and the filling work was carried out by curing for one day. By the above steps, a repair wall covering material made of an extrusion molded board according to Example 1 was obtained.

[0029] <Example 2> As in Example 1, two test pieces measuring 650 mm in the longitudinal direction were prepared. In the first step, two test pieces were butted up against each other, and 125 mm each on the left and right sides of the butted part (a total of 250 mm) were measured, and the removal work was carried out by exposing the hollow part by this length. Then, after the first step and before the second step, reinforcement work was carried out. Specifically, a primer (product name: Epotherm Primer XPS-400, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark) was applied at 200 g / m around the inside of the exposed hollow portion.2 Apply the coating, cure for one day, and then apply 400 g / m of primer (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark). 2 After coating, an organic fiber sheet (product name: Repelark 20, manufactured by Mitsubishi Chemical Infratec Corporation, carbon fiber sheet, basis weight: 200 g / m) was applied to the inner side of the hollow section and the wall of the partition section. 2 A topcoat (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark) was applied at a rate of 200 g / m. 2 The reinforcement work was carried out by applying the coating. In the second step, a primer with adhesive properties (product name: Quick Seal JB-919FD30, manufactured by Aica Kogyo Co., Ltd.; Quick Seal is a registered trademark) was applied to a water-conducting material (steel square pipe, length: 250 mm, cross section (outer diameter): 31 mm × 31 mm × 1.6 mmt), and the water-conducting material was inserted into the opening of the exposed hollow part and left to cure for 3 hours, thereby completing the formation work. The third step was carried out in the same manner as in Example 1. Then, after the third step, reinforcement work was carried out. Specifically, after the filling work was carried out, 200 mm on each side of the butt joint (400 mm in total) was measured, and a primer (product name: Epotherm Primer XPS-400, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark) was applied at 200 g / m2 to the smoothed surface within that range. 2 Apply the coating, cure for one day, and then apply 400 g / m of primer (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark). 2 After coating, an organic fiber sheet (product name: Repelark 20, manufactured by Mitsubishi Chemical Infratec, carbon fiber sheet, basis weight: 200 g / m) was applied to the surface. 2 A topcoat (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec Corporation; Epotherm is a registered trademark) was applied at a rate of 200 g / m. 2 The reinforcement work was carried out by applying the coating. By the above steps, a repair wall covering material made of an extrusion molded board according to Example 2 was obtained.

[0030] <Examples 3 to 9> In Examples 3 to 9, repair wall covering materials for extrusion molded boards were obtained in the same manner as in Example 2, except for the changes shown in Table 1. Note that a polyvinyl chloride square pipe (cross section (outer diameter): 28 mm × 28 mm × 2.5 mmt) was used as the water-conducting material.

[0031] <Example 10> In Example 10, as a second step, two flat plates with adhesive tape (made of foamed polyethylene, 450 mm x 10 mm x 20 mmt) were placed around the inside of the exposed hollow portion, parallel to the partition wall, and a primer with adhesive properties (product name: Quick Seal JB-919FD30, manufactured by Aica Kogyo Co., Ltd., Quick Seal is a registered trademark) was applied to the top of the two flat plates, and then a further flat plate (made of foamed polystyrene, 450 mm x 45 mm x 20 mmt) was placed on top of that to form a roughly torii-shaped water-conducting material. The process was carried out in the same manner as in Example 2, except that the formation work was carried out by curing for 3 hours. In this manner, a repair wall covering material made of extrusion-molded board according to Example 10 was obtained.

[0032] <Comparative Example 1> As in Example 1, two test pieces measuring 650 mm in the longitudinal direction were prepared. The first step was carried out in the same manner as in Example 1. The second step was not performed. In the third step, a primer (product name: Joliseal JBX-125, manufactured by Aica Kogyo Co., Ltd.; Joliseal is a registered trademark) was applied around the inside of the exposed hollow portion, and then a bonding material (product name: Mace Epo, manufactured by Aica Tech Building Materials Co., Ltd.; epoxy resin-based mortar; Mace Epo is a registered trademark) was filled into the hollow portion without using a water-conducting material, the surface of the extruded plate was smoothed, and the filling work was carried out by curing for 7 days. By the above steps, a repair wall covering material made of an extrusion molded board according to Comparative Example 1 was obtained.

[0033] <Comparative Example 2> In Comparative Example 2, a repair wall covering material for an extrusion molded plate was obtained in the same manner as in Comparative Example 1, except for the changes shown in Table 1. In Comparative Example 2, no water-conducting material was used, and a rod-shaped flat bar (steel, 38 mm x 300 mm x 3 mmt) was used instead.

[0034] <Comparative Example 3> In Comparative Example 3, a repair wall covering material for an extruded board was obtained in the same manner as in Comparative Example 1, except for the changes shown in Table 1. In Comparative Example 3, the first, second, and third steps were not performed, and only the surface reinforcement work of the extruded board was performed.

[0035] The physical properties of the extrusion molded plate repair wall covering materials prepared in the above examples were evaluated as follows. The results are also shown in Table 1.

[0036] <Strength> The strength was confirmed according to the JIS A 5441 "Extruded Cement Board (ECP)" bending strength test, and the bending failure load was calculated with a support span length of 1200 mm and two-line loading divided into four equal parts. In addition, surface loading was carried out after the repair process was completed and curing was allowed for seven days. Strength was evaluated as 16.7 MPa or more as ◎, 10.6 MPa or more but less than 16.7 MPa as 〇, 8.8 MPa or more but less than 10.6 MPa as △, and less than 8.8 MPa as ×.

[0037] <Drainage> The repair wall coverings of the extrusion molding boards according to each Example and Comparative Example were installed so that the longitudinal direction was approximately vertical, and water was poured into each hollow portion from above, and the presence or absence of drainage to the bottom was confirmed. Those that were able to drain were evaluated as ◯, and those that were not able to drain were evaluated as ×.

[0038] [Table 1]

[0039] The method for repairing cracks in the extruded plate according to the embodiment can be easily repaired, the strength of the extruded plate can be reinforced, and the occurrence of puddles inside the extruded plate can be suppressed. In addition, the strength of the backside load of the repair wall covering of the extruded plate according to the embodiment 5 was measured, and it was evaluated as ⊚. On the other hand, the method for repairing cracks in the extruded plate according to the comparative example was inferior to the embodiment in any of the physical property evaluations.

Claims

1. A method for repairing cracks that have occurred in an extrusion molding plate installed as a wall covering for a building, comprising: A first step of exposing a hollow portion provided in the longitudinal direction of the extrusion molded plate; a second step of forming a path in the exposed hollow portion in a longitudinal direction; and a third step of filling an adhesive around the path formed in the hollow portion.

2. 2. The method for repairing cracks in an extruded plate according to claim 1, characterized in that in the second step, the path is formed in the longitudinal direction by inserting and arranging a water-conducting material having a through hole in the axial direction.

3. A method for repairing cracks in an extruded plate as described in claim 1 or 2, characterized in that after the first step and before the second step, the method includes a reinforcing work of applying a reinforcing paint to the inside of the exposed hollow portion and attaching a reinforcing material.

4. A method for repairing cracks in an extruded plate as described in claim 1 or 2, characterized in that after the third step, the method includes a reinforcement work of smoothing the surface of the extruded plate, applying a reinforcing paint, and attaching a reinforcing material.

5. In a repair wall covering in which cracks have been repaired in an extrusion molding plate installed as a wall covering for a building, the extrusion molded plate body having a hollow portion provided in the longitudinal direction exposed; A path formed in the longitudinal direction of the exposed hollow portion; and a fastener filled around the path formed in the exposed hollow portion.

6. 6. A wall covering material according to claim 5, wherein the path is formed by a water-conducting material having a through hole in the axial direction.

7. 7. The repair wall covering material according to claim 5 or 6, characterized in that a reinforcing paint is applied to the inside of the hollow portion, and a reinforcing material is attached to the inside of the hollow portion.

8. 7. The repair wall covering material according to claim 5 or 6, characterized in that a reinforcing paint is applied to the surface of the extruded plate, and a reinforcing material is attached to the surface.

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