JPH086466B2 - Method of injecting adhesive into concrete cracks and gaps - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

FIGS. 3 (a) and 3 (b) show a conventional adhesive injection construction method. The construction method shown in FIG. 3 (a) has a small diameter by using a drill in a portion of a concrete structure 1 where a crack 2 has occurred. A circular hole 3 is bored, and then a washer 5 of an injection tool 4 is adhesively fixed to the surface of the concrete structure 1 with a sealing material 6 so as to communicate with the circular hole 3, and then an adhesive is press-fitted from the injection tool 4. ,
The adhesive is injected into the crack 2 through the circular hole 3.

In the construction method shown in FIG. 3B, a small-diameter injection hole 7 is bored in a portion of the concrete structure 1 where the crack 2 has occurred, and the pipe-shaped injection tool 4 is inserted into the injection hole 7. The adhesive is press-fitted into the injection tool 4 in a state of being inserted and 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 pressed in. It may not be possible to smoothly inject into the crack.

Further, the circular hole 3 is provided in the concrete structure 1
Since the crack 2 also communicates with the surface side of, when pouring the adhesive, it tries to flow in a direction with less penetration resistance,
A large amount of adhesive flows into the opening portion of the surface of the crack 2 to apply pressure to the sealing material 6 and damage it.
There is a problem that the adhesive cannot be injected to the deep part of the.

Furthermore, since the washer 5 attaches the washer 5 to the surface of the concrete structure 1 with the sealing material 6, the washer 5 has a weak adhesive force of 2 to 3 kg, and when the injection pressure is increased, injection is performed. The tool 4 will be disengaged.

Next, in the latter injection method, since the pipe-shaped injection tool 4 is inserted into the injection hole 7, when the adhesive is injected, air is confined in the injection hole 7 and the injection of the adhesive is smooth. It is not possible to do so, and a small diameter injection hole 7
When the hole is drilled, the generated cutting chips enter the crack, and the portion of the crack 2 communicating with the injection hole 7 is clogged, so that the press-fitted adhesive cannot be injected into the crack 2. There is a problem.

Therefore, the object of the present invention is to have a high effect of injecting an adhesive into cracks and gaps, and to inject it into cracks and gaps of concrete that can be injected into the cracks without damaging the sealing material even if the adhesive is injected at high pressure. It is to provide a method for injecting an adhesive.

[0010]

In order to solve the above problems, the present invention uses a core drill to make a cylindrical cut in a portion of a concrete structure or the like where cracks or gaps are formed. A recess is created by removing the enclosed part, and then the injection tool with the washer tip inserted into the recess is fixed by the fixative filled in the recess, and then cracked through this injection tool. This is a structure in which the adhesive is injected into the gap.

[0011]

[Function] When a crack is formed in a crack or a gap in a concrete structure using a core drill, and a cylindrical cut is made and the portion surrounded by the cut is broken and removed, the generation of cutting chips is reduced when forming a recess. It is possible to prevent the occurrence of cracks and clogging of gaps, insert the tip washer of the injection tool into the recess, and fix the injection tool with the fixing material filled in the recess to firmly fix the injection tool and to prevent cracks and gaps. It is possible to inject the adhesive with high pressure toward and to smoothly and reliably inject the adhesive into cracks and gaps.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The injection method according to the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings in accordance with an embodiment of injecting an adhesive into concrete cracks.

First, as shown in FIGS. 1 (a) and 1 (b), in a portion of the concrete structure 11 where the crack 12 is generated,
Using a core drill 13, a cylindrical cut 14 is made so as to intersect the crack 12. The diameter and depth of the cut 14 may be set according to the condition of the crack 12, and for example, the diameter is preferably set to about 10 to 100 mm and the depth is set to 5 mm or more.

The formation of the cuts 14 using the core drill 13 has an advantage that the cutting powder is less generated during the cutting process and the slits 12 are not clogged with the cutting powder.

After the cut 14 is processed, as shown in FIG. 1C, the cylindrical concrete piece 1 in the portion surrounded by the cut 14 is formed.
5 is removed by breaking or hauling, and a circular recess 16 is formed around the cut 14. This concrete piece 1
If the removal of 5 is carried out by breaking or hali, it is possible to surely prevent a new concrete surface from being exposed on the bottom surface of the recess 16 and to prevent the crack 12 from being clogged.

Next, as shown in FIG. 1D, the injection pipe 17
The tip of an injection tool 19 provided with a disk-shaped washer 18 on the outer circumference of the tip is inserted into the recess 16, and the fixer 20 is filled into the recess 16 with the washer 18 being close to the bottom surface of the recess 16. The injector 19 is fixed to the concrete structure 11.

The washer 18 at the tip of the injection tool 19 approaches the bottom surface of the recess 16, and the washer 18 is fixed from the outer surface side by the fixative 20 such as an adhesive filled to fill the recess 16 with the fixer 20. Since it adheres to the inner peripheral surface of the concave portion 16, a wide adhesion area can be obtained, and thus the injection tool 19 can be firmly fixed. By the way, the fixing force of the injection device 19 is 50
Can withstand pressures up to ~ 60 kg.

Further, since the tip of the injection tool 19 is close to the bottom surface of the recessed portion 16, the space is less generated, the amount of air taken in at the time of injecting the adhesive is reduced, and the tip of the injection tool 19 is It will communicate with the back of the crack 12.

As described above, the concrete structure 1 having the cracks 12 is fixed while the injection tool 19 is fixed in the concave portion 16.
The part that opens on the surface of 1 is closed with a sealing material 21.

In this state, using an appropriate injector, the injector 1
An adhesive such as an epoxy resin may be injected from 9 toward the crack 12, and the adhesive penetrates into the slit 12 from the bottom of the recess 16 as shown by an arrow in FIG.

The adhesive is cracked from the bottom of the recess 16 to the crack 12
Since it penetrates into the crack 12, it is possible to inject the adhesive from the deep side into the crack 12 and suppress the pressure from being applied to the sealing material 21,
It is possible to prevent damage.

Therefore, the adhesive can be efficiently injected from the injection tool 19 toward the crack 12 at a high pressure.
An adhesive can be injected over the entire 2.

The injection tool 19 shown in FIG. 1 (d) is provided with a washer 18 at the tip of the injection pipe 17 and a plug with a check valve (not shown) at the rear end of the injection pipe 17 for injection. The glue has been designed so that it will not flow backwards.

FIG. 2 shows an example of an injection tool 19 which accumulates pressure at the time of injecting the adhesive and can be gradually press-fitted and replenished after the injection of the adhesive. A plug 24 with a check valve is provided at the rear end, and a pressure accumulating container 25 is provided in the middle of the injection pipe 22 so that the adhesive accumulates when the adhesive is injected by the injector 26.
The inside air is compressed by flowing into the inside, and the adhesive is gradually pushed out by the pressure, so that the adhesive can be more completely pressed into the crack 12.

In any of the examples of the injection tools 19 and 19, after the adhesive is hardened, the sealing material 21 is removed and the injection tool 19 is pulled out or the portion protruding from the concrete structure is removed by cutting. Then, the surface may be finished with mortar or the like.

Although not shown, as a pressure accumulating injection tool, a washer is provided on the outer circumference of the tip end of a cylinder, and a piston is inserted into the cylinder so as to be movable in the axial direction. Connect the injection pipe that penetrates the rear end, and always apply forward elastic force to the piston with a spring, and attach adhesive to the crack from the check valve plug part provided at the rear end of the injection pipe. When press-fitting,
A structure may be adopted in which the piston is pushed into the cylinder to allow the adhesive to enter, and the spring is compressed to apply pressure to the adhesive.

In the illustrated embodiment, the adhesive is injected into the cracks 12 of the concrete structure 11, but the injection is not limited to such injection, and for example, cracks under the plywood or tiles, cavities formed inside these. Adhesive can be injected into gaps, water leaks, woodworking holes, etc.

[0028]

As described above, according to the present invention, the fixing strength of the injection tool is excellent, the adhesive can be injected into the cracks and the gaps at a high pressure, and the cracks and the gaps are not clogged. It is possible to inject the adhesive from a deep portion with respect to the gap and surely and efficiently inject the adhesive throughout the crack and the gap.

[Brief description of drawings]

FIG. 1A to FIG. 1D are process diagrams showing an injection method of the present invention.

FIG. 2 is a vertical cross-sectional view showing another example of the injection device of the above.

3A and 3B are vertical sectional views showing a conventional injection method.

[Explanation of symbols]

 11 Concrete Structure 12 Crack 13 Core Drill 14 Cut 16 Recess 17 Injection Pipe 18 Washer 19 Pouring Tool 20 Fixing Agent

Claims (1)

[Claims] 1. A cylindrical cut is made in a portion of a concrete structure or the like where a crack or a gap is formed by using a core drill, and a portion surrounded by the cut is removed to form a concave portion, and then a concave portion is formed. After fixing the injector with the washer-inserted tip into the recess with the fixative filled in the recess,
A method for injecting an adhesive into cracks or gaps of concrete, characterized by injecting an adhesive into the cracks or gaps via this injecting tool.