JP2001214617A - Infection method of adhesive into cracks and gaps of concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of securely and efficiently injecting an adhesive into cracks or the like generated in a concrete structure. SOLUTION: A cylindrical notch is formed so as to cross a crack 2 by means of a core drill in a position where cracks 2 of a concrete structure 1 bring about and a recess 24 is formed by removing the surrounded part by the notch. An injection implement 11 with a flange 14 is directly driven into the recess 24 and fixed thereto. Then, the adhesive is injected from the injection implement 11 to the crack 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting an adhesive into cracks and gaps for repairing cracks and gaps generated in concrete structures and concrete plates.

[0002]

2. Description of the Related Art For example, when a crack occurs in a concrete structure, it is necessary to inject the adhesive into the crack and repair it. For this reason, various construction methods for injecting the adhesive into the crack have already been proposed. .

FIGS. 4A and 4B show a conventional adhesive injection method, and the method shown in FIG. 4A uses a drill to reduce the diameter of a concrete structure 1 where a crack 2 has occurred. A circular hole 3 is formed, and then a washer 5 of an injecting tool 4 is bonded and fixed to the surface of the concrete structure 1 with a sealing material 6 so as to communicate with the circular hole 3. Thereafter, an adhesive is pressed from the injecting tool 4. ,
An adhesive is injected into the crack 2 through the circular hole 3.

In the construction method shown in FIG. 4B, a small-diameter injection hole 7 is drilled in a portion of the concrete structure 1 where a crack 2 has occurred, and a pipe-shaped injection tool 4 is inserted into the injection hole 7. Is inserted and the adhesive is pressed into the injection tool 4 while being fixed by the sealing material 6, and the adhesive is injected into the crack 2 through the injection hole 7.

[0005]

In the former injection method, since the opening of the circular hole 3 is closed by the washer 5, air is trapped in the circular hole 3 when the adhesive is press-fitted. May not be smoothly injected into cracks.

The circular hole 3 is provided in the concrete structure 1.
Also on the surface side of, because it is in communication with the crack 2, when the adhesive is injected, it tends to flow in the direction with less penetration resistance,
A large amount of the adhesive flows into the opening of the surface of the crack 2 to apply pressure to the sealing material 6 to cause breakage.
However, there is a problem that the adhesive cannot be injected to a deep part.

Further, since the injecting tool 4 is attached by attaching the washer 5 to the surface of the concrete structure 1 with the sealing material 6, the adhesive force of the washer 5 is 2-3 kg / cm ² , which is weak in strength and reduces the injecting pressure. If the size is increased, the injection tool 4 will be detached.

Next, in the latter injection method, since the pipe-shaped injection tool 4 is inserted into the injection hole 7, air is trapped in the injection hole 7 when the adhesive is injected, so that the injection of the adhesive is smooth. In addition to the small diameter injection hole 7
When drilling a hole, the generated cutting chips enter the crack, clogging occurs in a portion communicating with the injection hole 7 of the crack 2, and there is a case where the press-fitted adhesive cannot be injected into the crack 2. There is a problem.

Further, in any of the pouring methods, the sealing material 6 is required for fixing the pouring tool to the concrete structure 1, and it takes time to remove the sealing material 6 after the pouring is completed. It will stain the surface.

Therefore, an object of the present invention is to provide a high effect of injecting an adhesive into cracks and gaps, and to inject the adhesive into the crack without damaging the sealing material even when injecting the adhesive at a high pressure. It is an object of the present invention to provide a method of injecting an adhesive into cracks or gaps in concrete, which does not cause the sealing material to be stained with a sealing material, so that post-processing of the sealing material is unnecessary.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention of claim 1 provides a cylindrical cut using a core drill in a portion of a concrete structure or the like where a crack or a gap has occurred. A recess is made by removing the portion surrounded by the cut, and then the tip of the injection tool is driven into the recess and directly fixed, and then the adhesive is injected into cracks and gaps through the injection tool. This is a configuration in which injection is performed.

With the above configuration, if a cylindrical cut is made by using a core drill in a portion where a crack or a gap of a concrete structure is generated, and the portion surrounded by the cut is removed by cutting or the like, the cut is formed when the concave portion is formed. Less waste,
Cracks and clogging of gaps can be prevented, and if the tip of the injection tool is pressed into the recess to fix it,
The use of the sealing material is omitted, and the application and removal of the sealing material are not required.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The injection method of the present invention will be described below with reference to FIGS. 1 to 3 in accordance with an embodiment in which an adhesive is injected into cracks in concrete.

In order to carry out the adhesive injection method of the present invention, an injection tool 11 as shown in the figure and a driving jig 12 for the injection tool 11 are prepared.

The injection tool 11 is provided with a disk-shaped flange 14 at the tip of the injection pipe 13, and the injection pipe 13 may be made of any material such as synthetic resin or metal. A plug 15 having a check valve is fixed to the rear end of the injection pipe 13, and a branch pipe 16 is provided in the middle of the injection pipe 13. The branch pipe 16 is made of resin, vinyl chloride resin, hard urethane, or the like. 1
The pressure accumulating container 17 is detachably connected to 6 and can be closed with screws or the like.

The driving jig 12 includes the injection pipe 1.
3 is formed in a cylindrical shape with a hollow inside and an open front end side, and a slit 18 for allowing the branch tube 16 to escape is provided on the peripheral wall.

First, as shown in FIGS. 1 (A) and 1 (B), a cylindrical cut 22 is made using a core drill 21 so as to intersect the crack 2 in a portion of the concrete structure 1 where the crack 2 has occurred. . The diameter and depth of the cut 14 may be set according to the conditions of the crack 2. For example, it is preferable that the diameter is set to about 10 to 100 mm and the depth is set to 5 mm or more.

The formation of the cuts 22 using the core drill 21 has the advantage that the generation of cutting powder during cutting is small and that the cutting powder does not cause the cracks 2 to be clogged.

After processing the cuts 22, as shown in FIG. 2A, the columnar concrete piece 2 in a portion surrounded by the cuts 22 is formed.
3 is removed by cutting or cutting, and a circular recess 24 is formed around the cut 22. This concrete piece 2
If the removal of 3 is carried out by cutting or cutting, a new concrete surface is exposed on the bottom surface of the concave portion 24, and it is possible to reliably prevent the crack 2 from being clogged.

Next, as shown in FIG. 2B, a driving jig 12 is externally inserted into the injection pipe 13 of the injection tool 11, and a disk-shaped flange 14 is provided on the outer periphery of the tip of the injection pipe 13. The flange 14 is directly driven into the concave portion 24 by hitting the rear end of the driving jig 12 having the front end with the concave portion 24 with the hammer. Fix to object 1.

Since the injection tool 11 is directly driven into the recess 24 and fixed, the relationship between the recess 24 and the flange 14 formed in the concrete structure 1 is set so that the flange 14 has a slightly larger diameter than the recess 24. Then, the injection tool 11 can be fixed to the concrete structure 1 by driving the flange 14 into the recess 24 using the elasticity of the synthetic resin, and the flange 14 seals the opening end side of the recess 24. By injecting a flange 14 having a larger diameter and a thickness in the axial direction into the recess 24, the injection tool 11 can be firmly fixed to the concrete structure 1 by the elasticity of the synthetic resin. It can sufficiently withstand the adhesive injection pressure described later.

The injection tool 11 has a flange 14 at the tip and a concave portion 2.
When it is fixed at the predetermined depth position of 4, the tip opening of the injector 11 communicates with the depth of the crack 2 via the inside of the recess 24.

In the illustrated example, the crack 2 is
4 shows an example in which there is a portion that reaches the outer surface of the concrete structure 1 other than the perforated portion of FIG.
5 shows a sealed state.

As described above, when the injection tool 11 is driven into the recess 24 and fixed, the driving jig 12 is pulled out.
Close the branch tube 16 of the injection tool 11 with a screw, or
The pressure storage container 17 is connected as shown in FIG.

When there is water leakage from the crack 2,
When the branch tube 16 is closed with a screw, the pressure increases, and water leakage at other portions can be confirmed. In addition, the branch tube 16 may be opened to lower the pressure to seal the water leakage portion.

After the seal at the water leaking point is completely cured, an appropriate injection device 26, for example, a grease pump, a pressure pump, an injection pump with a hose or the like is used in the above-mentioned state.
An adhesive A such as an epoxy resin may be injected from the injection tool 11 toward the crack 2 as shown in FIG. 3, and the adhesive A penetrates into the crack 2 from the bottom of the concave portion 24 as shown by an arrow in FIG.

The adhesive A is applied to the crack 2 from the bottom of the recess 24.
, The adhesive can be injected into the crack 2 from the back, and the fixing force of the flange 14 to the recess 24 is secured so as to withstand the injection pressure at this time.

Therefore, the injection of the adhesive from the injection tool 11 toward the crack 2 can be efficiently performed at a high pressure, and the adhesive can be injected into the entire crack 2.

The injection tool 11 prevents the adhesive A injected by the plug 15 with a check valve provided at the rear end of the injection pipe 13 from flowing back. The adhesive A flows into the pressure accumulating vessel 17 at the time of injection to compress the internal air, and the pressure gradually pushes out the adhesive A, so that the adhesive A can be more completely pressed into the crack 2. I have.

After the curing of the adhesive A, the injection pipe 13 projecting from the concrete structure 1 of the injection tool 11 is cut off from the root of the flange 14, and if necessary, the flange 14 is removed by a core drill. The inside of the concave portion 24 may be filled with a resin mortar or the like for finishing.

Although not shown, the injection tool 11 may be one without the plug 15 with the check valve or the branch cylinder 16, or a pressure-accumulation type injection tool of a cylinder having an open end. A flange is provided on the outer periphery of the tip, and an injection pipe that penetrates the rear end of the cylinder is connected to a piston inserted so that it can move in the axial direction inside the cylinder, and the piston is always moved forward by a spring. Energize elasticity,
When adhesive is pressed into the crack from the plug with a check valve provided at the rear end of the injection pipe, the piston is pushed into the cylinder to allow the adhesive to enter, and the spring is compressed to apply pressure to the adhesive. May be.

Further, in the illustrated embodiment, the adhesive is injected into the crack 2 of the concrete structure 1. However, the present invention is not limited to such injection, and for example, cracks under a bean plate or a tile,
An adhesive can be injected into gaps such as cavities and the like, water leakage points, woodwork holes and the like generated inside these.

[0033]

As described above, according to the present invention, a cylindrical cut is made using a core drill in a portion of a concrete structure or the like where a crack or a gap has occurred, and a portion surrounded by the cut is removed. The indent is made in the recess, and then the tip of the inject is driven into the indent to directly fix it, so that the injecting tool has excellent fixing strength to concrete structures and the like, and the adhesive can be injected into cracks and gaps. The method can be performed at high pressure, and no cracks or gaps are clogged, and the adhesive can be reliably and efficiently injected over the entire cracks and gaps.

Further, the tip flange of the injection tool is driven into the concave portion to directly fix the injection tool to the concrete structure or the like, so that the use of a sealing material for fixing the injection tool to the concrete structure or the like can be omitted. , Not only is it easy to fix the injection tool to the concave part, but also the post-treatment by using the sealing material becomes unnecessary, and the work efficiency can be improved.
It does not stain the outer surface of the concrete structure or the like.

[Brief description of the drawings]

FIG. 1A is a front view of a concrete structure where a crack has been formed in a portion where a crack has occurred in a concrete structure using a core drill, and FIG. 1B is a longitudinal sectional view taken along arrow bb in FIG. 1A.

FIG. 2 (A) is a longitudinal sectional view in which a concrete piece is removed by a cylindrical cut to form a concave portion, and a longitudinal sectional view showing a fixed state of the pouring tool by being driven into the concave portion in the above.

FIG. 3 is a longitudinal sectional view showing a state where a road adhesive is injected by an injection tool.

FIGS. 4A and 4B are longitudinal sectional views showing a conventional injection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Crack 11 Injection tool 12 Driving jig 13 Injection pipe 14 Flange 15 Plug 16 Branch cylinder 17 Accumulator

Claims (1)

[Claims] 1. A concave portion is formed by making a cylindrical cut using a core drill in a portion of a concrete structure or the like where a crack or a gap has occurred, and removing a portion surrounded by the cut. A method for injecting an adhesive into cracks or gaps in concrete, wherein the adhesive is injected into cracks or gaps through the injection tool after directly fixing the tip of the injector into the cracks.