JPH09177330A - Method for repairing concrete structure and repairing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a crack repairing work of a concrete structure easily and repair even the depth of the concrete structure. SOLUTION: As for a repairing method of a concrete structure, a distribution passage, which is a piping member 21, is preliminarily formed inside a concrete exterior wall 10 of a concrete structure. Then, a concrete repairing material is injected into the pipe-like member 21 by way of a communication pipe 22, which is an injection means communicating with the inside of the pipe-like member 21 from the outside of the concrete exterior wall 10, thereby discharging the repair material injected from a broken area of the pipe-like member 21 produced by a stress by a crack 1 generated in the concrete exterior wall 10 and filling up and curing the repair material in the crack 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair method for a concrete structure and a repair structure for repairing cracks generated in the concrete structure.

[0002]

2. Description of the Related Art Generally, a concrete structure may be cracked due to temperature change, drying shrinkage of the concrete, uneven settlement of the structure, or the like. In particular, around an opening such as a window provided in a concrete structure, stress concentrates on the corner, so that a crack is likely to occur. The cracks may cause water leakage, and the air and water infiltrated through the cracks may corrode the reinforcing bars inside the concrete structure, leading to deterioration in strength and acceleration of deterioration of the concrete structure.

One of the methods for repairing this crack is, for example, the U-cut sealing method. For example, in order to repair the crack 32 generated at the corner 31a of the opening 31 such as a window provided in the concrete structure 30 by this U-cut sealing method, first, as shown in FIGS. 3 (a) and 3 (b). 8-10 mm along the crack 32
A groove 33 having a U-shaped cross section is formed. Then, this groove 3
After filling a repair material 34 such as a polyurethane-based sealing material or a flexible epoxy resin into the inside 3, apply a polymer cement mortar finishing material 35 or the like so as to close the groove 33 in order to hide the repair mark. Finish.

[0004]

However, the above U
The cut sealing method has a problem in that the construction is complicated because there are many working steps as described above.

Further, in this method, since the crack is repaired from the surface, for example, when the above-mentioned crack 1 is generated from the deep portion of the concrete structure 30,
It was difficult to reach the deep portion of the crack 1 with the repair material 34, and there was a fear that the corrosion of the internal reinforcing bars could not be sufficiently prevented.

[0006] Therefore, an object of the present invention is to solve the above-mentioned problems and to repair a crack generated in a concrete structure easily and to reach a deep portion of the concrete structure. A method and a repair structure are provided.

[0007]

In order to achieve the above object, a method for repairing a concrete structure according to the present invention comprises forming a flow passage in a concrete structure and communicating the outside of the concrete structure into the flow passage. A repair material for concrete is press-fitted into the flow passage through the injection means, and the injected repair material is caused to flow out from the fractured portion of the flow passage caused by the stress caused by the crack generated in the concrete structure, and the repair material Is filled in the cracks and cured (claim 1).

In this method of repairing a concrete structure, a flow passage is formed in advance in a place where a crack is expected to occur in the concrete structure, and the flow passage is broken by a stress such as a shearing force or a tensile force generated by the crack. At this time, the concrete repair material is injected into the flow passage through the injection means and flows out from the fractured portion of the flow passage into the crack. As a result, the repair material can be reliably filled even if the location of the crack is in the deep part of the concrete structure, and the repair material is injected into the flow passage after the crack is formed, so that the deterioration of the repair material occurs. It is possible to perform the work while maintaining the low viscosity and the high fluidity of the repair material without considering the above, and to sufficiently diffuse and fill the crack.

On the other hand, in the repair structure for a concrete structure according to the present invention, a tubular member which is embedded in the concrete structure and is made of a low elastic material such as plastic, and a tubular member from outside the concrete structure are provided inside the tubular member. It is composed of a communication pipe that communicates (claim 2).

According to this repair structure, since the hollow tubular member is embedded in the concrete structure, the repair material flow path can be easily formed. Further, since the tubular member is formed of a low elastic material such as plastic, it can be reliably broken by the cracks that have occurred. Further, since the communication pipe is provided, the repair material can be easily injected into the tubular member through the communication pipe.

Further, in the above concrete repair structure,
It is preferable that at least two communication pipes are provided (claim 3).

In order to repair a concrete structure with such a structure for repairing a concrete structure, first, a repair material for concrete is put into a tubular member through any one of two or more communication pipes. Press fit. At this time, the other communication pipe is closed. Then, immediately after the press-fitting of the repair material is completed, other communication pipes are opened and compressed air or the like is sent from any one of the communication pipes, and the repair material remaining in the tubular member is discharged from the other communication pipe to the outside of the concrete structure. To discharge. Thereby, the flow passage for press-fitting the repair material can be secured again, and the crack repair work by the above method can be repeated.

In the invention according to any one of claims 1 to 3, the concrete repair material is a silicone-based or acrylic-based material that maintains high fluidity before hardening and retains elasticity after hardening. A material containing a resin material such as polyurethane can be used, and a solvent or a diluent can be added to maintain low viscosity.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method for repairing a concrete structure and the repair structure of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing a case where a method of repairing a concrete structure and a repair structure 20 according to the present embodiment is adopted to repair a crack 1 generated in a concrete outer wall 10 which is a concrete structure. FIG. 2 is a perspective view showing the tubular member 21 and the communication pipe 22 according to the present embodiment.

The concrete outer wall 10 is provided with an opening 11 for penetrating a window and the like in the center thereof so as to penetrate the front and back, and the reinforcing bars 12 are arranged in a lattice pattern within the wall thickness. , Rebars 12 and 4 at the corners of the opening 11
The opening reinforcing bar 12b is arranged so as to intersect at 5 degrees. Further, the crack 1 is generated from the inside of the concrete outer wall 10 to the surface thereof, and the opening 11
Extending radially from the corner 11a.

The repair structure 20 is generally composed of a tubular member 21 embedded in the concrete outer wall 10 and a communicating pipe 22 communicating with the tubular member 21 from the outside of the concrete outer wall 10.

The tubular member 21 is for forming a flow path for the repair material, and is embedded in a place where cracks are expected to occur, for example, around a window or the like. The tubular member 21 is a tubular member made of a material that can be broken by a stress such as a shearing force or a tensile force due to a crack generated in concrete. For example, a biodegradable plastic (Gunze stock (Made by a company, etc.) or a material such as methyl polymethacrylate having a small tensile elongation.

In this embodiment, this tubular member 21
Is designed assuming a crack of about 0.3 mm,
The inner diameter of the tubular member 21 is set to 10 mm to 15 mm, and the tubular member 21 is embedded in an annular shape surrounding the outer peripheral portion of the opening 11 and close to the reinforcing bar 12. Further, on the outer surface of the tubular member 21, a large number of irregularities 21a are formed to enhance the adhesion strength with surrounding concrete.

On the other hand, the communication pipes 22 are L-shaped pipes in this embodiment, and two pipes are provided above and below the opening 11, and one end of the communication pipe 22 is connected to the tubular member 21. The other end is opened on the surface of the concrete outer wall 10. The communication pipe 22 can be formed by using the same material as the material forming the tubular member 21.

On the other hand, the repair material is preferably a material having low viscosity and high fluidity before curing and capable of retaining elasticity after curing. For example, a one-component adhesive agent, for example, It is possible to use a silicone-based, acrylic-based, or polyurethane-based material that uses a solvent or diluent for ensuring viscosity.

Arrangement of the repair structure 20 on the concrete outer wall 10 is performed by, for example, the tubular member 21.
Was arranged so as to be wound around the opening 11 to form an annular shape, and was tightly connected to the reinforcing bar 12 reinforced during the construction of the concrete outer wall 10 by using a metal fitting 12a and the like, and was connected to the tubular member 21. This is done by fixing the open end of the communication pipe 22 at a predetermined position and then pouring concrete. At this time, in the present embodiment, since the tubular member 21 has a tubular shape, it can be easily arranged around the opening 11 by winding the tubular member 21 around the opening 11.

The repair work of the crack 1 generated on the concrete outer wall 10 is performed by the following procedure. First, when the crack 1 is generated, a stress such as a shearing force or a tensile force is generated on the concrete outer wall 10, and the tubular member 21 is broken by this stress. Next, after closing one of the upper and lower communication pipes 22, the concrete repair material is press-fitted into the tubular member 21 through the other communication pipe 22 using, for example, a pump. During the press-fitting, it is preferable to seal the surface of the crack 1.

The repair material press-fitted into the tubular member 21 flows through the tubular member 21 and the tubular member 2 from the fracture portion.
1 flows out and is diffused and filled in the crack 1. Then, when it is confirmed that the repair material is discharged from the crack 1 on the surface of the concrete outer wall 10 or the other communicating pipe 22, the press-fitting operation is finished.

After that, the crack 1 is repaired by the repair material coming into contact with air and hardening. At this time, in particular, in the present embodiment, since the tubular member 21 is arranged close to the reinforcing bar 12, the repair material that has flowed out can be made to wrap around the reinforcing bar 12 near the crack 1 to cover the reinforcing bar 12. It is possible to reliably prevent the reinforcing bar 12 from rusting.

Further, in the present embodiment, after the repair method of the above procedure is completed, the closed communication pipe 22 is opened, and compressed air is introduced into the tubular member 21 through either the upper or lower communication pipe 22. Is removed and the repair material remaining in the tubular member 21 is removed by discharging it from the other communicating tube 22. Thereby, a flow passage for press-fitting the repair material later can be secured, the repair work by the above-described method can be repeatedly performed, and a crack that occurs later can be dealt with.

In this embodiment, a plurality of communication pipes 22 are provided to remove the repair material remaining in the tubular member 21 by compressed air. However, the present invention is not limited to this, and the communication pipes 22 may be used. Only one may be provided.

[0027]

As described above, according to the method for repairing a concrete structure according to the first aspect of the present invention, the concrete repair material is injected into the tubular member by the injection means, and the fracture portion of the tubular member into the crack. Therefore, even if the location of the crack is deep in the concrete structure,
It is possible to reliably fill the repair material. In addition, since the repair material is injected into the tubular member after cracks have occurred, it is not necessary to consider deterioration of the repair material, and at the time of repair work, maintain the low viscosity and high fluidity of the repair material. It is workable and can be sufficiently diffused and filled without cracking.

On the other hand, according to the repair structure for a concrete structure according to the second aspect of the present invention, since the tubular member is embedded in the concrete structure, the flow passage of the repair material can be easily formed. Further, since the tubular member is formed of a low elastic material such as plastic, it can be reliably broken by a crack that has occurred. Furthermore, since a communication pipe that communicates with the tubular member in advance is provided, the tubular member can be easily broken through the communication pipe. The repair material can be injected into the tubular member.

Further, in the above concrete repair structure, a plurality of communication pipes are provided, and immediately after the press-fitting of the repair material is completed, compressed air is sent from one of the communication pipes to remove the repair material remaining in the tubular member from the other. If it is discharged from the communication pipe,
A flow passage for press-fitting the repair material can be secured again, and the crack repair work by this method can be repeated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for repairing a concrete structure of the present invention, (a) is a front view of the concrete structure, and (b) is a sectional view taken along the line AA in (a). Is.

FIG. 2 is a perspective view showing a tubular member and a communication pipe used in the present embodiment.

FIG. 3 is an explanatory view showing a work procedure of a conventional method for repairing a concrete structure, (a) is a front view of the concrete structure, and (b) is an enlarged view of a crack generated in an outer wall of the concrete. FIG.

[Explanation of symbols]

 1 Crack 10 Concrete outer wall (concrete structure) 20 Repair structure 21 Tubular member 22 Communication pipe

Claims (3)

[Claims] 1. A concrete structure in which a flow passage is formed in advance, and a concrete repair material is press-fitted into the flow passage through an injection means communicating from the outside of the concrete structure into the flow passage. A method for repairing a concrete structure, characterized in that the injected repair material is caused to flow out from a fractured portion of the flow passage caused by a stress caused by a crack generated in the crack, and the repair material is filled into the crack and hardened. 2. A tubular member which is embedded in a concrete structure and is made of a low elastic material such as plastic, and a communication pipe which communicates from the outside of the concrete structure into the tubular member. Characteristic concrete structure repair structure. 3. The repair structure for a concrete structure according to claim 2, wherein at least two communication pipes are provided.