JPS626066A - Repairing of concrete structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to the repair of concrete structures in which a chemical solution is injected into defective voids such as cracks and bulges opened on the surface of the concrete structure. It is about the method.

<Prior art> - As is well known, concrete buildings and structures tend to develop thin cracks on their surfaces over a long period of time, or the mortar sprayed onto the surface may lift up, creating voids between the mortar and the building structure. Occurs. If defective voids such as cracks and raised voids are left untreated, they will gradually expand, causing part of the surface mortar or concrete to peel off or reduce strength. must be injected.

In order to inject the chemical solution into the above-mentioned defective void, attach the substrate d with the cylindrical portion C upright to the surface of the wall surface of the concrete structure where the crack a has occurred, at appropriate intervals along the crack a, Seal material e is applied to the crack opening between substrates d and d.
A chemical liquid injection device is attached to the cylindrical portion C, and the chemical liquid is pumped from the cylindrical portion C into the crack a by this injection device.

(Problem to be solved by the invention) However, since the chemical liquid has a high viscosity, it is not possible to sufficiently inject it to the corners of the crack simply by injecting it under pressure.
It takes a long time, therefore, in this case, a sufficient repair effect cannot be expected, and the work efficiency is poor.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and includes a pouring tool having a pouring port and a pouring device that can be applied to the wall surface of a concrete structure where defective voids such as cracks and lifting have occurred. An inhalation tool having an inlet is attached in communication with the defective gap, the opening of the defective gap is closed with a sealing material, a chemical injection device is connected to the inlet, an inlet device is connected to the inlet, and the inlet is connected to the inlet. The present invention aims to provide a method for repairing a concrete structure, in which air is sucked in the defective void using a device, and then a chemical solution is pumped into the defective void through an injection port using an injection device.

(Function) According to the present invention, with the above-described configuration, the inside of the defective gap becomes a negative pressure, and the chemical liquid supplied under pressure from the injection port easily enters the defective gap.

<Example) The present invention will be explained below based on embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 3, the wall surface b! This is for repairing a crack al that penetrates from the front surface to the back surface of the wall surface b1. Insert the air intake tool 2 into the opening of the crack bl that opens to the side.
a... are attached at appropriate intervals, and the opening of the crack b1 that has come off from the injection tool 1a or the suction tool 2a is marked with the parts shown in Figs. 2 and 3.
As shown in the figure, a sealing material e such as adhesive tape is applied to close the crack opening.

The injection tool 1 has one end of a cylindrical portion 5 connected upright to a substrate 4 having an injection port 3, and an injection valve 6 at the other end of the cylindrical portion 5.
A drug solution supply tube 7 of a drug solution injection device (not shown) such as a pump is connected to the inlet of the injection valve 6. The injection tool 1 is provided with a packing layer (not shown) on the back surface of the 5-board 4 so that it can be fixed to a rough concrete surface in a liquid-tight manner.

On the other hand, the intake device 2 has one end of a cylindrical portion 10 connected upright to a cup-shaped mounting base 9 having a large intake port 8, and an intake valve 11 provided at the other end of the cylindrical portion 10. The valve 11 is equipped with a suction device such as a vacuum pump (not shown).
The intake pipe 12 is connected. Note that this intake device 2 is
An extremely flexible packing layer 13 is provided on the opening edge of the mounting base 9 so that it can be fixed airtightly to a rough concrete surface.

To inject a medicinal solution using the above-described injection tool 1 and suction tool 2, first close the injection valves 6 of all the injection tools 1a... 11... and operate the intake system. When the intake device operates, the inside of the mounting base 9 becomes negative pressure, so the gasket layer 1
3 is more strongly pressed against the concrete surface bl, and the airtightness between the air intake tools 2a... and the concrete surface bl is improved. Therefore, due to the operation of the intake system, cracks
The air inside is sucked out from the intake ports 8..., and the inside of the crack a1 becomes negative pressure. When the inside of the crack Al becomes sufficiently negative pressure, all the intake valves 11 are closed to temporarily stop the intake process. After that, all the injection valves 6... are opened to operate the chemical liquid pressure feeding device, and the chemical liquid is supplied from the chemical liquid supplying pipe 7 to the injection tool 1a. Due to the negative pressure inside the crack al and the pressurized chemical solution, the chemical solution supplied into the injection tool la does not leak to the outside and flows through the injection port 3...
・It is sucked into the crack al, and the crack a1 is sucked into the crack al.
spread along the expanse of After injecting an appropriate amount of the drug solution, the injection valve 6 of the injection tool la is closed to stop the injection process, and the intake valve 11 of the injector la... is closed.
...and start the intake process again. When the intake process is restarted, the chemical solution injected from the injection tools 1a... flows through the cracks al toward the back side of the concrete wall due to the intake air from the intake tools 2a... Therefore, even a highly viscous chemical solution flows into every corner of the crack al in a short time.

In this way, after the inside of the defective gap al is made negative pressure by the suction process from the suction tool 2a..., when the chemical solution is injected under pressure with the injection tool 1a..., the defective gap a! A large amount of chemical solution can be filled into the narrow corners of the container in a short time.
You can expect a reliable repair effect, the work time is short, and the work can be done efficiently.

In other embodiments shown in FIGS. 4 and 5, the mortar b2 on the surface is lifted up and the mortar b2 and concrete frame b3
This is a case where a defective gap #aZ is generated between the two and the defective gap a2 is to be repaired. In such a case, as shown in Figure 4 and Figure 5, through-holes 14, 15, etc. are opened from the surface of the mortar b2 to the defective gap a2, and the through-hole is opened approximately in the center of the defective gap a2. The injection tool 1b is connected to the through hole 15 formed at the edge of the defective gap a2.
Connect the inhalation tool 2b... to the inhalation tool 2b..., connect the drug solution supply tube 7 of the drug solution injector to the injection valve 6 of the infusion tool 1b, and connect the intake device's tube 7 to the intake valve 11 of the inhalation tool 2b... Intake pipe 12
... are connected to each other. If the defective gap a2 opens on the surface of the mortar b2, the opening is closed with a sealing material e... In addition, in order to detect the end of the defective gap a2 from the outside, use ultrasonic waves. It is recommended to use the same non-destructive testing equipment.

To inject the chemical into the defective gap a2, first close the injection valve 6 of the injection tool 1b, and then close the injection valve 11 of the intake tool 2b...
...Open and operate the intake system 1. The inside of the defective gap a2 is made negative pressure. After making the defective gap a2 sufficiently negative pressure, the intake valves 11 of the intake tools 2b... are closed, and then the injection valves 6 of the injection tools 1b are opened to operate the chemical injection device, and the injection tools ib are opened. A chemical solution is supplied under pressure from the injection port 3 into the defective gap a2. When the injection port 3 supplies the chemical liquid to the approximate center of the defective gap a2, the negative pressure inside the defective gap a2 causes the chemical liquid to diffuse in all directions and flow in. After injecting an appropriate amount of the chemical liquid, the injection valve 6 is closed. When the intake valve 11... is opened and the air in the gap a2 is sucked out again, the chemical solution in the gap a2 is further diffused. Therefore, a large amount of chemical solution can be injected into the defective void a2 created by the floating of the first surface mortar b2, and moreover, the defective void a2 is invisible from the outside.
The drug solution can be sufficiently filled even in the narrow end of the tube. Therefore, a high repair effect can be expected.

Other embodiments shown in FIGS. 6 and 7 are made of concrete.
This is to repair a crack a3 in which an opening opens on the surface.The injection device IC is placed halfway along the length of the opening, and the suction devices 2c and 2c are placed at the end of the opening. The suction tool 2c is sealed with a sealing material e, and the injection valve 6 of the injection tool 1c is closed as in the above embodiment.

The intake valve 11.11 of 2C is opened to operate the intake device to create a negative pressure inside the crack a3. Thereafter, after closing the intake valve 11, the injection valve 6 is opened, and the chemical liquid is supplied under pressure from the injection port 3 into the crack a3 by the operation of the chemical liquid injection device. The chemical liquid injected into the crack a3 from the middle of the length of the opening is diffused along the expansion of the crack a3 due to the negative pressure inside the crack a3. After injecting an appropriate amount of chemical solution, close the injection valve 6 and open the intake valve 11 again to suck out the air inside the crack a3, and the chemical solution inside the crack a3 will flow to the end of the crack a3. Even if there is a problem, a large amount of chemical solution can be injected into every corner, and a high repair effect can be expected.

<Effects of the Invention> As explained above, according to the present invention, the chemical solution is injected under pressure after the inside of the defective void is made negative pressure, so even if the chemical solution has a high viscosity, it is possible to uniformly inject the chemical solution into the minute voids of the defective void. It can be filled easily and can be injected in a short time. Therefore, the repair effect of the chemical solution can be significantly improved compared to the conventional method, and the work can be carried out efficiently.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG.
−゛ゞ°″“1alL? 4 [K! ″′″′″ A cross-sectional view of a concrete wall showing the case where one person is working.
A front view of the intake device in the embodiment shown in the figure, FIG.
4 is a front view of the injection tool in the example shown in the figure, FIG. FIG. 6 is a front view of the concrete wall shown, and FIG. 6 is a cross-sectional view of the concrete wall when a chemical solution is injected into the crack. FIG. 7 is a front view of the concrete wall shown in FIG. 6, and FIG. 8 is a perspective view showing a conventional chemical injection state. 1 injection device, 2 suction device, 3 injection port, 6 injection valve, 7 drug supply tube, 8 suction port, 9 mounting base, 11
1 is an intake valve, 12 is an intake pipe, and 13 is a packing layer. Patent applicant Production Technology Center Co., Ltd. Figure 8 Range 1 Figure 4 [5m]

Claims (1)

[Claims] On the surface of the wall of a concrete structure where defective voids such as cracks and lifting have occurred, an injection tool having an injection port and an intake tool having an intake port are provided so as to communicate with the defective voids, and the opening of the defective voids is also provided. A chemical injection device is connected to the injector, and a suction device is connected to the suction device.The suction device creates a negative pressure in the defective cavity, and the injector injects the chemical solution from the injection port into the defective cavity. A method for repairing a concrete structure, characterized in that the concrete structure is pumped inwards.