Concrete crack decompression injection method and repair kit

Abstract

To achieve easy and high-quality construction.SOLUTION: Provided is a concrete crack decompression injection method and a repair kit. The method comprises sealing a crack C on a concrete surface 10a by applying a seal tape 3 thereto and injecting an injection material 2 into the crack C while the interior of the crack is decompressed during injection, and includes pressurizing means and suction means as means for generating the decompressed state, wherein the seal tape 3 is transparent and is recessed when decompressed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a concrete crack vacuum injection method and a repair kit. [Background technology]

[0002] Conventionally, a "crack injection method," which is one of the methods for repairing concrete structures, is a method of filling cracks by filling a groove formed along the crack on the surface of the crack with injection material, inserting an injection pipe and a suction pipe into the crack, and pressing the injection material into the crack while sucking out the air inside the crack through the suction pipe (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 03-081467 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional crack repair method described in Patent Document 1 has the problem that it is not possible to fully grasp the filling status of the injection material into the cracked area. Furthermore, when the injection material is injected only by suction through a suction pipe, air pockets in the concrete or in small cracks can lead to incomplete filling. In such cases, a device with a high pressure reduction capacity, such as a vacuum pump, must be connected to the suction pipe, and more injection material than is actually required to inject into the cracks must be filled into the injection tool. This injection material remains in the injection tool and hardens, generating a lot of waste and placing a burden on the environment, so there is room for improvement in this regard as well.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a concrete crack vacuum injection method and repair kit that enable simple and high-quality construction. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, aspect 1 of the concrete crack decompression injection method according to the present invention is characterized in that sealing tape is applied to cracked areas on the concrete surface to seal them, and injection material is injected into the cracked areas while the pressure inside the crack is reduced during injection.

[0007] In the concrete crack decompression injection method according to the present invention, sealing tape is applied to the cracked area of ​​the concrete, and the air inside the crack is suctioned and decompressed during injection of the injection material, thereby facilitating the injection of the injection material into the crack and reducing the injection time. Furthermore, by decompressing the crack by suction, air pockets present inside the crack can be removed. This ensures reliable injection of the injection material, reduces injection material filling defects, and enables high-quality repair work.

[0008] In addition, in a second aspect of the present invention, in the reduced pressure injection method for cracking concrete of the first aspect, it is preferable that the means for generating the reduced pressure state include a pressurizing means and a suction means.

[0009] In this case, the pressure inside the crack can be efficiently reduced by the pressurizing means and the suction means.

[0010] In addition, in a third aspect of the present invention, in the concrete crack vacuum injection method of the first or second aspect, it is preferable that the sealing tape is transparent.

[0011] In this case, by visually checking the filling status of the injection material in the cracked area through the sealing tape, it is possible to grasp the injection status of the injection material filling pipeline, etc. In other words, although cracks in concrete are often fine and have complex linear shapes, the interconnectedness of these fine cracks can be easily confirmed visually through the sealing tape.

[0012] In addition, in a fourth aspect of the present invention, in the concrete crack vacuum injection method according to any one of the first to third aspects, it is preferable that the sealing tape is recessed in the decompressed state.

[0013] In this case, the air inside the crack is sucked out and the pressure is reduced when the injection material is injected, causing a dent in the surface of the applied sealing tape. Therefore, by visually checking this dent in the tape surface, it is easy to determine whether the cracks are connected.

[0014] Furthermore, aspect 5 of the present invention relates to a concrete crack vacuum injection method according to any one of aspects 2 to 4, in which three tools are provided as the pressurizing means and the suction means: a suction injector with a check valve, an injector with a check valve, and a suction device with a check valve; and there are a first case using the suction injector with a check valve, a second case using a combination of the injector with a check valve and the suction device with a check valve, or a third case using a combination of the three types of tool: a suction injector with a check valve, an injector with a check valve, and a suction device with a check valve. In any of the first, second, and third cases, the injection material is injected after reducing the pressure using multiple tools, and it is preferable that the tools are fixed to the cut openings in the sealing tape applied to cover the cracked area, or to the gaps created when the sealing tape was used to cover the cracked area.

[0015] In this case, three instruments are provided: a suction injector with a check valve, a injector with a check valve, and a suction injector with a check valve. One of three cases that appropriately combine these instruments is selected, and the multiple instruments in the selected case are fixed to the desired crack location, for example with adhesive, allowing injection and decompression to be performed at the crack site using a simple method.

[0016] In addition, in a sixth aspect of the present invention, in the concrete crack vacuum injection method of any one of the second to fifth aspects, it is preferable that the suction means is disposed above the pressurizing means.

[0017] In this case, even if the crack on the concrete surface to be repaired is horizontal and the crack is vertical or diagonal, the pressure inside the crack can be reduced by the suction means located at the top, and the injection material can be efficiently filled.

[0018] In addition, in aspect 7 of the present invention, in the concrete crack vacuum injection method of any one of aspects 2 to 6, it is preferable that the suction means is arranged in a position on the side of the crack where the width is larger than the pressurizing means.

[0019] In this case, the injection material is filled using a pressure means placed on the side of the crack where the crack width is smaller, while the air inside the crack is sucked out using a suction means placed on the side of the crack where the crack width is larger, thereby sucking out the air pockets and filling the crack up to the end.

[0020] In addition, in aspect 8 of the present invention, in the concrete crack vacuum injection method of any one of aspects 5 to 7, it is preferable to connect a vacuum device to at least one of the suction devices or suction injectors to reduce the pressure inside the crack, and to inject the injection material from at least one other of the injectors or suction injectors.

[0021] In this case, the injection part of the injection material serves as the pressurizing means, and at least the pressurizing means and the suction means are provided, so that the pressure inside the crack can be efficiently reduced.

[0022] Furthermore, aspect 9 of the repair kit according to the present invention is characterized by comprising sealing tape that can be applied to cracked areas on concrete surfaces; three tools, namely, a suction injector with a check valve, an injector with a check valve, and an aspirator with a check valve, which create a reduced pressure inside the crack when injecting injection material; and a pressure reducing device connected to multiple of the tools in any of the following cases: a first case using the suction injector with a check valve, a second case using a combination of the injector with a check valve and the aspirator with a check valve, and a third case using a combination of the three types of suction injector with a check valve, the injector with a check valve, and the aspirator with a check valve.

[0023] In this case, a reduced pressure injection method for cracking concrete that can achieve the effects of the first embodiment described above can be realized. [Effects of the Invention]

[0024] The concrete crack vacuum injection method and repair kit of the present invention enable simple and high-quality construction. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view showing a concrete crack decompression injection method according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view showing a wide range of the concrete crack decompression injection method shown in FIG. 1. [Figure 3] FIG. 4 is a plan view showing the configuration of the cut opening of the sealing tape. [Figure 4] FIG. 2 is a perspective view showing the configuration of an injector and an aspirator. [Figure 5] 1A is a cross section taken along line II in FIG. 1, showing the state in which the injector and aspirator are installed, and FIG. 1B is a cross section taken along line II-II in FIG. 1, showing the state in which the sealing tape is installed. [Figure 6] 1(a) to 1(d) are plan views showing the construction procedure of the concrete crack decompression injection method. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a concrete crack vacuum injection method and a repair kit according to an embodiment of the present invention will be described with reference to the drawings.

[0027] As shown in FIGS. 1 and 2, the reduced pressure injection method for cracking concrete according to this embodiment is a repair method in which a repair kit 1 is used to inject an injection material 2 into a cracked area C of concrete 10 .

[0028] The concrete 10 to be repaired may be any concrete structure in which the concrete surface 10a of the concrete 10 to be repaired is exposed to the outside, and the concrete surface 10a is not limited to being flat. Therefore, the orientation of the concrete surface 10a may be the top surface, such as a floor surface, or the side surface, such as a wall surface. 1 and 2, through or non-through cracks have occurred inside the concrete surface 10a. These cracks include non-through, fine, complex, linear crack holes.

[0029] The method for repairing such concrete 10 involves applying sealing tape 3 to the cracked area C on the concrete surface 10a to seal it, and then injecting injection material 2 into the cracked area C while the pressure inside the crack C is reduced during injection.

[0030] The injection material 2 is selected from materials suitable for the crack conditions (such as the degree, depth, and progression of the crack), and inorganic and organic materials are used alone or in combination, taking into consideration waterproofing, adhesion, and flexibility. Examples of inorganic materials include cement milk and sodium silicate, while examples of organic materials include polymeric cement admixtures, epoxy resins, and polyester resins.

[0031] First, the sealing tape 3 is applied to the cracked area C. The sealing tape 3 is transparent. For example, the sealing tape 3 is made of PET (polyethylene terephthalate), has a tape width of 30 mm or more and less than 75 mm, a transmittance of 70% or more for light having a wavelength of 450 to 750 nm, a tensile modulus (Young's modulus) of 3000 MPa or less, and a 3% tensile strength of 4 to 10 N / mm. Therefore, when the sealing tape 3 is applied to the concrete surface 10a, the concrete surface 10a on the side where the sealing tape 3 is applied can be seen from the outside through the sealing tape 3. Furthermore, because the applied sealing tape 3 has the above-mentioned tensile modulus, it has the property of recessing when the pressure inside the crack is reduced.

[0032] The sealing tape 3 is applied along the line of the cracked area C (see Figures 5(b) and 6(a)). As a result, the crack opening of the applied cracked area C is covered and blocked with the sealing tape 3, thereby sealing the crack. Specifically, as shown in Figures 1 and 2, a gap 31 of about 5 mm is provided, for example, with a length of about 200 to 300 mm to match the shape of the crack area C, and sealing tape 3 is applied to all crack lines to be repaired.

[0033] As shown in Figure 3, another method of applying the sealing tape 3 is to apply the sealing tape 3 without leaving any gaps 31 as described above when the crack area C is linear so that it can be positioned at the center of the sealing tape 3, and to create cut openings 32 in the widthwise center of the sealing tape 3 at intervals of approximately 200 to 300 mm along the longitudinal direction of the sealing tape 3.

[0034] The gaps 31 between the sealing tapes 3 shown in Fig. 2 and the cut openings 32 provided in the sealing tape 3 shown in Fig. 3 are areas that expose the cracked areas C. In other words, the gaps 31 and the cut openings 32 become the injection or suction areas for the injection material 2, and are areas where the injector 4A and suction device 4B described below are installed. In the following description, the gap 31 shown in FIG. 2 is used.

[0035] Next, an injector 4A with a check valve and an aspirator 4B are installed in the gap 31 between the applied sealing tapes 3 (see Figure 6(b)). In this embodiment, the injector 4A and the aspirator 4B have the same configuration. An injector 4A (pressurizing means) is installed in one gap 31 (for example, the gap indicated by reference numeral 31A in Figure 2) of the sealing tapes 3 attached to the cracked area C, and an aspirator 4B (suction means) is installed in another gap 31 (for example, the gap indicated by reference numeral 31B in Figure 2) adjacent to the injector 4A. The injector 4A and the aspirator 4B are means for generating a reduced pressure state. It is preferable to place the aspirator 4B on the side of the cracked area C where the crack width is larger. Here, the region of the cracked portion C between the installed injector 4A and aspirator 4B is defined as a filling region R.

[0036] As shown in FIG. 4, the injector 4A and the suction device 4B each include a main body 41 that can be adhered to the concrete surface 10a (the tape surface 3a of the applied sealing tape 3) with an adhesive (not shown), and an opening 42 to which an injection pipe 40A or a suction pipe 40B can be attached. The main body 41 is formed in the shape of a hollow plate, and has an opening 43 in the bottom wall 41a that connects the hollow portion 41c to the lower portion. The upper wall 41b of the main body 41 is provided with a transparent window 44 that allows the state of the hollow portion 41c to be visually observed from the outside. The lower surface of the bottom wall 41a is preferably flat. In addition, the transparent window 44 is provided with a grout discharge portion 45.

[0037] In the case of the injector 4A, the injection material 2 is injected from the opening 42, passes through the hollow portion 41c, and is poured out below the bottom wall 41a from the opening 43. An injection pipe 40A connected to an injection pump for the injection material 2 (not shown) is attached to the opening 42 of the injector 4A (see FIG. 5(a)).

[0038] In the case of the suction device 4B, by suctioning from the opening 42, the cracked area C is sucked through the opening 43, and the pressure is reduced, thereby sucking out the air inside the cracked area C. Furthermore, in the case of the suction device 4B, the state in which the injected injection material 2 flows into the hollow area 41c from the opening 43 can be visually confirmed through the transparent window 44. A suction pipe 40B connected to a pressure reducing device (not shown) is attached to the opening 42 of the suction device 4B.

[0039] The injector 4A and the suction device 4B are attached to the installation surface (concrete surface 10a and tape surface 3a) by adhesive. The injector 4A and the suction device 4B are installed so that the opening 43 covers the cracked area C exposed through the gap 31 (see FIG. 5(a)).

[0040] The above-mentioned sealing tape 3, the suction device 4B and the injector 4A with a check valve (or a suction injector with a check valve) and a pressure reducing device (not shown) are configured as a repair kit 1.

[0041] Alternatively, three tools may be provided as the pressurizing means and suction means: a suction injector with a check valve, a syringe with a check valve, and a suction device with a check valve. A repair method may be employed in which one of the following is selected: Case 1, which uses a suction injector with a check valve; Case 2, which uses a combination of a syringe with a check valve and a suction device with a check valve; or Case 3, which uses a combination of the three types: a suction injector with a check valve, a syringe with a check valve, and a suction device with a check valve. In this case, in either Case 1, Case 2, or Case 3, the pressure is reduced using multiple tools before injection of the grout 2. These tools are fixed with adhesive to the cracked area C or to the open area of ​​the sealing tape 3 at the cracked area that can be seen through the sealing tape 3.

[0042] Using the repair kit 1, as shown in Figures 6(a)-(d), a sealing tape 3 is applied to the cracked area C, an injector 4A and an aspirator 4B are installed, and the injection material 2 is injected from the injector 4A to fill the cracked area C. When the aspirator 4B is used, the air inside the cracked area C is sucked from the injector 4A side to the aspirator 4B side, as shown in Figure 6(d). That is, the injection material 2 is filled into the cracked area C while the air inside the cracked area C is sucked by the aspirator 4B. As a result, the injection material 2 injected by the injector 4A fills the cracked area C, and in the filling area R, the injection material 2 moves from the injector 4A side to the aspirator 4B side. By setting the vacuum level by the aspirator 4B to, for example, 20 Pa or higher, it is possible to connect the cracks, thereby solving problems that were difficult to manage in construction management with conventional techniques, such as the formation of air pockets in thin cracks or when the injection material 2 is filled, resulting in incomplete filling.

[0043] In this way, by reducing the pressure in the filling area R using the injector 4A and the aspirator 4B, a depression is created in the sealing tape 3 that seals the cracked area C in the filling area R, along the cracked area C. Therefore, by visually checking the depression in the sealing tape 3, it is possible to determine whether the cracks are connected and the filling pipeline for the injection material 2. If no dents can be found in the sealing tape 3, it is preferable to add a new injector 4A and aspirator 4B in the filling region R to ensure a filling pipeline.

[0044] Furthermore, since the sealing tape 3 of this embodiment is a transparent tape with a transmittance of, for example, 70% or more, the filling status of the injection material 2 at the crack area C can be visually confirmed through the sealing tape 3, and the injection status of the injection material 2 filling pipeline, etc. can be grasped.

[0045] Here, the repair method according to the crack condition of the cracked area C will be explained in more detail. When the crack direction on the concrete surface 10a to be repaired is horizontal and the crack direction is vertical or diagonal, a repair method is adopted in which the suction means, suction device 4B, is placed above the pressure means, injector 4A, and injection is performed from the bottom of the crack, and suction is performed from the top where the injection material 2 is filled.

[0046] If the crack width of cracked area C is small and short, a repair method is adopted in which an injector 4A is placed on the side of the crack where the crack width is small, and an aspirator 4B is placed on the side of the crack where the crack width is large, and ... small, and aspirator 4B is placed on the side of the crack where the crack width is large, aspirator 4A is placed on the side of the crack where the crack width is small, and aspirator 4B is placed on the side of the crack where the crack width is large, aspirator 4B is placed on the side of the crack where the crack width is small, and aspirator 4B is placed on the side of the crack

[0047] If the crack width at cracked area C is large and long, a repair method is adopted in which multiple injectors 4A are installed, an aspirator 4B is installed on the side of the crack with the larger width to suck up the material, and the material is injected from the injector 4A that is away from the aspirator 4B.

[0048] If the injection material 2 cannot be filled due to air pockets, a cut is made in the sealing tape 3 at that location, and the injection is carried out while releasing the air. After the injection material 2 is discharged onto the tape surface 3a of the sealing tape 3, the area is sealed with the sealing tape 3 that has been cut in advance.

[0049] Next, the operation of the above-mentioned concrete crack vacuum injection method and repair kit 1 will be described in detail with reference to the above-mentioned Figs. In the concrete repair injection method of this embodiment, a sealing tape 3 is applied to the cracked area C on the concrete surface 10a to seal it, and then an injection material 2 is injected into the cracked area C while the pressure inside the crack is reduced during injection.

[0050] In the concrete crack decompression injection method of this embodiment, a sealing tape 3 is attached to the cracked area C of the concrete 10, and the air inside the crack is sucked out and decompressed when the injection material 2 is injected, thereby facilitating the injection of the injection material 2 into the crack and reducing the injection time. In addition, by reducing the pressure inside the crack by suction, air pockets and the like present inside the crack can be removed by suction due to the reduced pressure. This ensures reliable injection of the injection material 2, reduces insufficient filling of the injection material 2, and enables high-quality repair work.

[0051] In this embodiment, the means for generating the reduced pressure includes a pressurizing means and a suction means, and in this case, the pressure inside the crack can be efficiently reduced by the pressurizing means and the suction means.

[0052] In addition, in this embodiment, since the sealing tape 3 is transparent, the filling status of the injection material 2 in the cracked area C can be visually confirmed through the sealing tape 3, and the injection status of the filling pipeline of the injection material 2 can be grasped. In other words, although cracks in the concrete 10 are often minute and have complex linear shapes, the interconnected status of these minute cracks can be easily confirmed visually through the sealing tape 3.

[0053] In this embodiment, the sealing tape 3 is recessed when the pressure is reduced. With this configuration, the air inside the cracks is sucked out and the pressure is reduced when the injection material 2 is injected, causing a depression in the tape surface 3a of the applied sealing tape 3. Therefore, by visually checking the depression in the tape surface 3a, it is easy to determine whether the cracks are connected.

[0054] Furthermore, in this embodiment, three tools are provided as the pressurizing means and suction means: a suction injector with a check valve, a syringe with a check valve, and a suction device with a check valve. There are three cases: a first case using a suction injector with a check valve; a second case using a combination of a syringe with a check valve and a suction device with a check valve; and a third case using a combination of the three types: a suction injector with a check valve, a syringe with a check valve, and a suction device with a check valve. In any of the first, second, and third cases, the injection material 2 is injected after reducing the pressure using multiple tools. The tools are fixed to the cut openings in the sealing tape 3 applied to cover the cracked area, or to the gaps created when the sealing tape 3 was used to cover the cracked area. By configuring it in this way, three instruments are provided: a suction injector with a check valve, an injector with a check valve, and a suction injector with a check valve.One of three cases that appropriately combine these instruments is selected, and the multiple instruments in the selected case are fixed to the desired crack location with adhesive.This simple method allows injection and decompression into the cracked area.

[0055] Furthermore, in this embodiment, the suction means is arranged above the pressure means, so that even if, for example, the crack direction on the concrete surface 10a to be repaired is horizontal and the crack direction is vertical or diagonal, the pressure inside the crack can be reduced by the suction means arranged above, and the injection material 2 can be efficiently filled.

[0056] In this embodiment, the suction means is disposed at a location on the side of the pressurizing means where the crack width is larger. In this case, the injection material 2 is filled using a pressure means placed on the side of the crack where the crack width is smaller, while the air inside the crack is sucked out using a suction means placed on the side of the crack where the crack width is larger, thereby sucking out the air pockets and filling the crack up to the end.

[0057] In this embodiment, a pressure reducing device is connected to at least one of the suction devices 4B or suction injectors to reduce the pressure inside the crack, and the grouting material 2 is injected from at least one of the other injectors 4A or suction injectors. In this case, the injection portion of the injection material 2 serves as the pressurizing means, and therefore at least the pressurizing means and the suction means are provided, so that the pressure inside the crack can be efficiently reduced.

[0058] As described above, the concrete crack vacuum injection method and repair kit according to this embodiment allow for simple and high-quality construction.

[0059] The above describes embodiments of the concrete crack vacuum injection method and repair kit according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the spirit of the present invention.

[0060] For example, in this embodiment, the sealing tape 3 is a transparent member, but it is not limited to being transparent. In addition, in this embodiment, the sealing tape 3 is a member having the property of being depressed when the pressure is reduced, but it is not limited to a material that is depressed by the reduced pressure.

[0061] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0062] 1 Repair Kit 2 Injection material 3 sealing tape 3a Tape surface 4A syringe 4B Suction device 10. Concrete 10a Concrete surface 31, 31A, 31B gap 32 Cutout opening C. Cracked area

Claims

1. This method involves applying sealing tape to cracked areas on a concrete surface to seal them, and then injecting injection material into the cracked areas while the pressure inside the crack is reduced during injection.

2. 2. A concrete crack vacuum injection method according to claim 1, wherein the means for generating the reduced pressure comprises a pressurizing means and a suction means.

3. 3. The method for reducing pressure when grouting concrete cracks according to claim 1, wherein the sealing tape is transparent.

4. 3. The concrete crack decompression injection method according to claim 1, wherein the sealing tape is recessed in the decompressed state.

5. three devices are provided as the pressurizing means and the suction means: a suction syringe with a check valve, a syringe with a check valve, and a suction syringe with a check valve; There are three cases: a first case using the suction injector with check valve; a second case using a combination of the injector with check valve and the suction injector with check valve; and a third case using a combination of three types of suction injector with check valve, an injector with check valve, and a suction injector with check valve. In any one of the first case, the second case, and the third case, a plurality of the tools are used to reduce pressure and then an injection material is injected; The concrete crack vacuum injection method described in claim 2, characterized in that the device is fixed to the cut opening of the sealing tape applied to cover the crack area, or to the gap created when covering the crack area with the sealing tape.

6. 3. The method for reducing pressure to form cracks in concrete according to claim 2, wherein the suction means is disposed above the pressurizing means.

7. 3. The method for vacuum injection into cracked concrete according to claim 2, wherein the suction means is disposed at a position on the larger crack width side than the pressurizing means.

8. A concrete crack decompression injection method as described in claim 5, characterized in that a decompression device is connected to at least one of the suction devices or suction injectors to reduce the pressure inside the crack, and the injection material is injected from at least another of the injectors or suction injectors.

9. A sealing tape that can be applied to cracked areas on concrete surfaces, Three tools are included: a suction injector with a check valve, an injector with a check valve, and a suction injector with a check valve, which reduce the pressure inside the crack when injecting the injection material. In any one of the first case using the suction injector with check valve, the second case using a combination of the injector with check valve and the suction injector with check valve, and the third case using a combination of three types of devices, namely, a suction injector with check valve, an injector with check valve, and a suction injector with check valve, A repair kit comprising:

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