Method for repairing cracks in extruded panels and wall covering materials for repair.

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 plate and a repair wall material.

Background Art

[0002] Conventionally, an extruded plate has been preferably used as a wall material for building structures. In particular, an extruded cement plate, which is a kind of extruded plate, is a decorative material that is easy to construct, and also has features of high strength and excellent weather resistance.

[0003] In recent years, extensive research and development have been conducted on methods for repairing cracks in extruded plates. For example, in Patent Document 1, there is an extruded plate having a pair of substantially rectangular surface plates arranged substantially in parallel, a plurality of partition walls extending in the longitudinal direction of the surface plates and integrally connecting the pair of surface plates at a predetermined interval, and a hollow portion defined between adjacent partition walls, and attached to the building frame so that the longitudinal direction is substantially vertical. A method for repairing a crack generated in the width direction, in which a hole is formed in the surface plate below the crack, a receiving material is provided in the hollow portion directly below the hole from the hole, and mortar is injected and filled into the hollow portion from the hole and cured, so as to straddle the crack, and a dense columnar mortar fixing portion is formed in the hollow portion. A method for repairing cracks is disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] Incidentally, while extruded panels are commonly used as exterior wall materials for building structures, cracks can occur due to aging and deterioration, potentially spreading not only to the surface but also to the back side. However, confirming these cracks has been difficult. Furthermore, replacing extruded panels requires modifications to the interior surface of the building structure, which places a significant burden on residents and workers and is not easy.

[0006] Therefore, as a method for repairing cracks in extruded panels, a technique has been used in which mortar or similar material is injected into the cracks to fill the hollow parts of the extruded panel and reinforce its strength. However, although this method can reinforce the cracks, if water accumulates inside the extruded panel, it cannot be properly drained, which can lead to deterioration of the performance of the extruded panel or seepage into the interior surface and affect it, so there was room for improvement. [Overview of the project] [Problems that the invention aims to solve]

[0007] The problem that this invention aims to solve is to provide a method for repairing cracks in extruded panels and a repair wall covering material that can be easily repaired even while installed as a wall covering material in a building, can reinforce the strength of the extruded panel, and can suppress the occurrence of water accumulation inside the extruded panel. [Means for solving the problem]

[0008] The present invention relates to a method for repairing cracks in an extruded panel installed as a wall covering for a building, and is characterized by comprising: a first step of exposing a hollow portion provided in the longitudinal direction of the extruded panel; a second step of forming a path in the longitudinal direction in the exposed hollow portion; and a third step of filling the area around the formed path in the hollow portion with a fixing material. [Effects of the Invention]

[0009] The present invention provides a method for repairing cracks in extruded panels, which allows for easy repair even while the panels are installed as wall coverings in buildings. It also has the effect of reinforcing the strength of the extruded panels and suppressing the formation of water accumulation inside the panels. [Brief explanation of the drawing]

[0010] [Figure 1] Front view of an extruded sheet. [Figure 2] A front view showing an extruded sheet cut vertically down the center of its longitudinal direction, representing a crack. [Figure 3] A front view showing the state after the first process, with the hollow section exposed. [Figure 4] A perspective view showing the reinforcement work being carried out after the first process and before the second process. [Figure 5] A perspective view showing the process of inserting a water-conducting material with through holes in the axial direction as part of the second stage of formation. [Figure 6] A perspective view showing the formation of a roughly torii-shaped water guide during the second stage of the formation process. [Figure 7] A perspective view showing the third stage of the filling process. [Figure 8] A perspective view showing the reinforcement work being carried out after the third stage. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below, step by step. The present invention is characterized by comprising: a first step of exposing a hollow portion provided in the longitudinal direction of an extruded sheet; a second step of forming a path in the longitudinal direction in the exposed hollow portion; and a third step of filling the area around the formed path in the hollow portion with a fixing material.

[0012] The extruded plate according to the present invention is mainly composed of an inorganic material. For example, an extruded cement plate made of cement can be mentioned. As the shape of the extruded cement plate, generally, two rectangular flat plates are arranged in parallel, the flat plates are connected by a plurality of partition walls, and there are hollow portions between the partition walls.

[0013] <First step> In the present invention, as the first step, it is necessary to perform a removal operation to expose the hollow portion provided in the longitudinal direction of the extruded cement plate.

[0014] Specifically, targeting the cracked portion generated in the extruded plate, the position of the hollow portion provided in the longitudinal direction of the extruded cement plate is confirmed from the drawing or the like, and the flat plate portion corresponding to the position of the hollow portion is removed to provide an opening. As the procedure, for example, holes are drilled at the four corners of the flat plate portion, and the four sides are cut with a grinder from the drilled portions to remove the flat plate portion corresponding to the position of the hollow portion.

[0015] By this removal operation, the hollow portions arranged at predetermined intervals in the longitudinal direction can be exposed. Then, after exposing the hollow portion, removing the burrs generated at the opening and sweeping away the shavings, the process proceeds to the next second step.

[0016] <Second step> In the present invention, as the second step, it is necessary to perform a forming operation to form a path in the longitudinal direction in the exposed hollow portion. Since a water conduit can be secured by this second step, the generation of water accumulation in the extruded plate can be suppressed.

[0017] As the forming operation, for example, after applying a primer having an adhesive performance to a water guiding material having a through hole in the axial direction, it is inserted and arranged in the exposed hollow portion and cured for a certain period of time.

[0018] The water-conducting material is a cylindrical material with a circular or polygonal cross-section, such as an organic resin or metal pipe. The length of the water-conducting material is preferably greater than or equal to the length of the hollow section exposed during the removal process. Furthermore, in this invention, the strength of the extruded sheet can be improved by arranging the water-conducting material.

[0019] In addition to water guides with through holes in the axial direction, water guides can also be arranged by inserting roughly U-shaped or roughly semi-circular water guides. Using water guides made from such single parts allows for easy assembly and is very economical as it leads to cost reduction.

[0020] In addition, as shown in Figure 6, the forming method involves placing two flat plates inside the hollow section. A water guide can be constructed in a roughly torii-gate shape by arranging it parallel to the partition wall and placing a flat plate on top of it. Examples of flat plates include those made of organic resin or metal, and they can be combined using various adhesives or adhesive tapes.

[0021] Furthermore, additional reinforcement work may be carried out when performing the second step. One example of reinforcement work is to apply a primer to the inside of the exposed hollow section after the first step is completed and before the second step is started, allow it to cure for a certain period of time, apply a base coat, then bond a fiber sheet, and finally apply a top coat to finish. In particular, by bonding the fiber sheet not only to the back of the hollow section but also to the wall surface of the partition wall, the strength after reinforcement can be further improved.

[0022] For primers, undercoats, and topcoats, various types of paints can be used, such as epoxy resin-based, urethane resin-based, urea resin-based, and acrylic resin-based paints. As for fibrous sheets, there are organic fiber sheets and inorganic fiber sheets. Examples of organic fibers include carbon fiber, aramid fiber, vinylon fiber, polypropylene fiber, and polyethylene fiber, while examples of inorganic fibers include glass fiber and rock wool fiber.

[0023] <Third step> In the present invention, as a third step, it is necessary to perform a filling operation in which a fixing material is filled around the formed path in the hollow portion. This third step allows the path formed in the second step described above to be fixed in place.

[0024] Specifically, the process involves applying a primer to the water guide material and the inner periphery of the exposed hollow section within the reach of the application tool from the opening, then filling the hollow section, such as around the water guide material, with a fixing agent, smoothing the surface of the extruded plate, and curing it for a certain period of time. Examples of fixing agents include epoxy resin-based and acrylic resin-based mortars.

[0025] Furthermore, after the third step, additional reinforcement work may be performed. This reinforcement work may involve filling the hollow section with a fixing agent, smoothing the surface, and then repeating the process performed before the start of the second step. For example, this could involve applying a primer to the smoothed surface, applying an undercoat, then laminating a fiber sheet, and finally applying a topcoat to finish. Repeating the reinforcement work can further improve the strength after reinforcement.

[0026] For primers, undercoats, and topcoats, various types of paints can be used, such as epoxy resin-based, urethane resin-based, urea resin-based, and acrylic resin-based paints. As for fibrous sheets, there are organic fiber sheets and inorganic fiber sheets. Examples of organic fibers include carbon fiber, aramid fiber, vinylon fiber, polypropylene fiber, and polyethylene fiber, while examples of inorganic fibers include glass fiber and rock wool fiber.

[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> As test specimens, we prepared extruded cement boards (manufactured by Aica Tech Building Materials Co., Ltd., product name: Mace, Mace is a registered trademark, 600mm x 1300mm x 60mm thick). Then, we cut the center of the longitudinal direction of the extruded cement board vertically, simulating a crack. This produced two test pieces, each 650mm in length. As the first step, two test pieces were butted together, and 175 mm was measured on each side from the point of contact (350 mm total). By exposing the hollow section to this length, the removal process was carried out. As the second step, an adhesive primer (product name: Quickseal JB-919FD30, manufactured by Aica Kogyo Co., Ltd., Quickseal is a registered trademark) was applied to the water-conducting material (SUS square pipe, length: 400 mm, cross-section (outer diameter): 40 mm x 20 mm x 1.5 mm thick). The water-conducting material was then inserted through the opening of the exposed hollow section and placed in position, and the molding process was carried out by curing for 3 hours. As the third step, within the reach of the application tool from the opening, a primer (product name: Jolyseal JBX-125, manufactured by Aica Kogyo Co., Ltd., Jolyseal is a registered trademark) was applied to the water-conducting material and the inner periphery of the exposed hollow section. Then, a fixing agent (product name: Mace Epoxy, manufactured by Aica Tech Building Materials Co., Ltd., epoxy resin mortar, Mace Epoxy is a registered trademark) was filled into the hollow section, the surface of the extruded molded board was smoothed, and the filling work was completed by curing for one day. Through the above steps, an extruded panel repair wall covering material according to Example 1 was obtained.

[0029] <Example 2> Similar to Example 1, two test specimens measuring 650 mm in the longitudinal direction were prepared. As the first step, two test pieces were butted together, and 125 mm was measured on each side from the point of contact (250 mm total). By exposing the hollow section to this length, the removal process was carried out. Then, after the first step and before the second step, reinforcement work was carried out. Specifically, 200g / m² of primer (product name: Eposerm Primer XPS-400, manufactured by Mitsubishi Chemical Infratec, Eposerm is a registered trademark) was applied to the inside perimeter of the exposed hollow section.2 Apply, allow to cure for 1 day, then apply 400g / m² of primer (Eposerm Resin XL-800, manufactured by Mitsubishi Chemical Infratec, Eposerm is a registered trademark). 2 After application, an organic fiber sheet (product name: Repelark 20, manufactured by Mitsubishi Chemical Infratec, carbon fiber sheet, basis weight: 200g / m²) is applied to the inner wall of the hollow section and the partition wall. 2 The Repelark (registered trademark) is bonded, and a topcoat (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec, Epotherm is a registered trademark) is applied at a rate of 200 g / m². 2 The reinforcement work was carried out by applying the coating. As the second step, an adhesive primer (product name: Quickseal JB-919FD30, manufactured by Aica Kogyo Co., Ltd., Quickseal is a registered trademark) was applied to the water guide material (steel square pipe, length: 250 mm, cross section (outer diameter): 31 mm x 31 mm x 1.6 mm thick). The water guide material was then inserted through the opening of the exposed hollow section and placed in position, and the shaping process was carried out by curing for 3 hours. 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, 200 mm was measured on each side of the butt joint (400 mm in total), and 200 g / m of primer (product name: Eposerm Primer XPS-400, manufactured by Mitsubishi Chemical Infratec, Eposerm is a registered trademark) was applied to the smoothed surface within that range. 2 Apply, allow to cure for 1 day, then apply 400g / m² of primer (Eposerm Resin XL-800, manufactured by Mitsubishi Chemical Infratec, Eposerm is a registered trademark). 2 After application, an organic fiber sheet (product name: Repelark 20, manufactured by Mitsubishi Chemical Infratec, carbon fiber sheet, basis weight: 200g / m²) is placed on the surface. 2 The Repelark (registered trademark) is bonded, and a topcoat (Epotherm Resin XL-800, manufactured by Mitsubishi Chemical Infratec, Epotherm is a registered trademark) is applied at a rate of 200 g / m². 2 The reinforcement work was carried out by applying the coating. Through the above steps, a repair wall covering material made of extruded board according to Example 2 was obtained.

[0030] <Examples 3-9> Examples 3 to 9 were carried out in the same manner as in Example 2, except for the changes shown in Table 1, and each yielded a repair wall covering made of extruded panel. A polyvinyl chloride square pipe (cross section (outer diameter): 28 mm × 28 mm × 2.5 mm thick) was used as the water conduit.

[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 mm thick) were placed parallel to the partition wall around the inside of the exposed hollow section, and an adhesive primer (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. Then, another flat plate (made of foamed polystyrene, 450 mm x 45 mm x 20 mm thick) was placed on top of that to form a roughly torii-gate-shaped water-conducting material, which was then cured for 3 hours. The process was carried out in the same manner as in Example 2, and an extruded panel repair wall covering material according to Example 10 was obtained.

[0032] <Comparative Example 1> Similar to Example 1, two test specimens 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. As the third step, a primer (product name: Jolyseal JBX-125, manufactured by Aica Kogyo Co., Ltd., Jolyseal is a registered trademark) was applied to the inside of the exposed hollow section. Then, without using a water-conducting material, a fixing agent (product name: Mace Epoxy, manufactured by Aica Tech Building Materials Co., Ltd., epoxy resin mortar, Mace Epoxy is a registered trademark) was filled into the hollow section, the surface of the extruded molded board was smoothed, and the board was cured for 7 days to complete the filling process. Through the above process, an extruded panel repair wall covering material according to Comparative Example 1 was obtained.

[0033] <Comparative Example 2> In Comparative Example 2, the procedure was carried out in the same manner as in Comparative Example 1, except for the changes shown in Table 1, to obtain an extruded panel repair wall covering. In Comparative Example 2, a water-conducting material was not used, and a rod-shaped flat bar (steel, 38 mm x 300 mm x 3 mm thick) was used instead.

[0034] <Comparative Example 3> In Comparative Example 3, the procedure was carried out in the same manner as in Comparative Example 1, except for the changes shown in Table 1, to obtain a repair wall covering material made of extruded board. In Comparative Example 3, the first, second, and third steps were omitted, and only the surface reinforcement work of the extruded board was performed.

[0035] The physical properties of the extruded panels used as repair wall coverings in the above-described examples were evaluated according to the following procedure. The results are shown in Table 1.

[0036] <Strength> To verify strength, the bending strength test was conducted in accordance with JIS A 5441 "Extruded Cement Board (ECP)" bending strength test. The support span length was 1200 mm, and the bending failure load was determined by applying a load to four equal parts of two lines. In addition, in all cases, surface loading was performed after curing for 7 days after the completion of the repair process. Strengths of 16.7 MPa or higher were evaluated as ◎, 10.6 MPa or higher and less than 16.7 MPa as ○, 8.8 MPa or higher and less than 10.6 MPa as △, and less than 8.8 MPa as ×.

[0037] <Drainage> For each example and comparative example, the extruded panel repair wall covering was installed so that its longitudinal direction was approximately vertical, and water was poured into each hollow section from the top. The presence or absence of drainage to the bottom was checked. Those that drained were marked with ○, and those that did not drain were marked with ×.

[0038] [Table 1]

[0039] The method for repairing cracks in extruded panels according to the examples was effective in that it could be repaired with simple work, could reinforce the strength of the extruded panels, and could suppress the occurrence of water accumulation inside the extruded panels. Furthermore, when the strength of the wall covering material for repairing extruded panels according to Example 5 was measured under back load, it received an excellent rating. On the other hand, the method for repairing cracks in extruded panels according to the comparative examples was inferior to the examples in all physical property evaluations.

Claims

1. In a method for repairing cracks that occur in extruded panels installed as wall coverings for buildings, A first step is to expose the hollow portion provided in the longitudinal direction of the extruded sheet, A second step involves forming a path in the longitudinal direction in the exposed hollow portion, A method for repairing cracks in an extruded sheet, comprising a third step of filling the area around the formed path in the hollow portion with a fixing material.

2. The method for repairing cracks in an extruded sheet according to claim 1, characterized in that, in the second step, a water-conducting material having through holes in the axial direction is inserted and positioned to form the aforementioned path in the longitudinal direction.

3. A method for repairing cracks in an extruded sheet according to claim 1 or 2, characterized in that, after the first step and before the second step, a reinforcing step is performed in which a reinforcing paint is applied to the inside of the exposed hollow portion and a reinforcing material is bonded to it.

4. A method for repairing cracks in an extruded molded board according to claim 1 or 2, characterized in that, after the third step, the surface of the extruded molded board is smoothed, a reinforcing paint is applied, and a reinforcing material is bonded to it.

5. In a repaired wall covering material in which cracks that occurred in an extruded panel installed as a wall covering material for a building have been repaired, The extruded plate body has a hollow section in the longitudinal direction that is exposed, The path formed in the longitudinal direction of the exposed hollow portion, A repair wall covering for a crack, characterized by comprising: a fixing material filled around the path formed in the exposed hollow portion; and a fixing material.

6. The repair wall covering material for repaired cracks according to claim 5, characterized in that the aforementioned path is formed by a water-conducting material having through holes in the axial direction.

7. The crack-repaired wall covering 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 bonded to it.

8. The crack-repaired wall covering material according to claim 5 or 6, characterized in that a reinforcing paint is applied to the surface of the extruded board and a reinforcing material is bonded to it.

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