JPH0913693A - Repairing method of column body - Google Patents

Abstract

PURPOSE: To easily repair a column body by inserting reinforcements between both of these by winding iron plates round a concrete column body, and filling monshrinkage cement grout in a space into which the reinforcements are inserted. CONSTITUTION: Iron plates 11 are wound at prescribed intervals round a concrete footing pile column body 10 according to a shape of the column body, and mating parts of the iron plates 11 are welded. Reinforcements 12 are arranged at proper intervals between the column body 10 and the iron plates 11, and uncontracted cement grout is filled in a space after the reinfrocements 12 are arranged, and is hardened and cured. In this way, since the outer periphery of the column body is covered with the iron plates 11, even if an earthquake happens, since there is no possibility that concrete cracks and brokenly falls, aseismatic strength can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a column body which is cracked or buckled due to an earthquake or the like when reinforcing a column body having insufficient seismic strength.

[0002]

2. Description of the Related Art In general, a column body having insufficient seismic strength or a column body cracked or buckled due to an earthquake or the like is remarkably deteriorated in strength and cannot function as a column body. Construction is required. However, simply forming a form around the existing pillars and reinforcing them with reinforcing bars or concrete did not successfully join the boundary surface with the existing concrete.
In addition, a method of making synthetic resin or the like penetrate into cracks has also been proposed.

[0003]

By the way, the above-mentioned conventional method of constructing a form around a concrete columnar body and reinforcing it with reinforcing bars or concrete requires a lot of construction days and is economically costly. It was a thing. Further, as described above, the joint with the existing concrete boundary surface was poor and the desired strength could not be improved. Further, in the case of the method of injecting concrete or synthetic resin into the crack portion, even if it is injected from the outside, it leaks to the outside and it is difficult to effectively infiltrate the inside.

The object of the present invention was made in view of the above-mentioned conventional drawbacks, and a method of repairing a column body which does not have sufficient earthquake resistance or a column body which is cracked or buckled due to an earthquake or the like is effectively repaired. To provide.

[0005]

A method of repairing a columnar body according to the present invention comprises a step of winding and welding an iron plate around a concrete columnar body having insufficient strength, the concrete columnar body and the iron plate. It is characterized by comprising a step of inserting a reinforcing bar between them and a step of filling the space in which the reinforcing bar is inserted with a non-shrinkage cement grout.

Further, a step of winding and welding an iron plate around the cracked concrete pillar body, and a step of inserting a reinforcing bar between the concrete pillar body and the iron plate,
Inserting an injection pipe between the concrete pillar and the iron plate and fixing it with an adhesive, filling the space in which the rebar is inserted with non-shrinkage cement grout, and connecting a plunger pump to the injection pipe. And a step of injecting an adhesive epoxy resin.

[0007]

As described above, the method of repairing a pillar according to the present invention is
Since the non-shrinkage cement grout or epoxy resin for adhesion is injected after surrounding the outer circumference with a steel plate, the seismic strength can be greatly enhanced.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall perspective view showing a method of repairing a columnar body which is an embodiment of the present invention. Concrete pillar 10
Is a column with insufficient existing seismic strength. Now, a case where the concrete pillar 10 is repaired by the repairing method of the present invention will be described.

First, an iron plate 11 is wound around the concrete foundation pile column 10 in accordance with the shape of the column. At this time, there is a predetermined space between the concrete pillar 10 and the iron plate 11. The mating portion 11a of the iron plate 11 is welded.

Further, as shown in FIG. 2, reinforcing bars 12 are arranged between the concrete pillars 10 and the iron plates 11 at appropriate intervals. The non-shrinkage cement grout 13 is filled in the space after the reinforcing bars 12 are arranged. Non-shrink cement grout 13
Cure and cure. In this way, the concrete pillar 10
In the repairing method of the present invention, since the outer periphery of the column is covered with the iron plate 11, there is no risk of the concrete cracking and missing even if an earthquake or the like occurs, and the seismic strength can be improved.

Next, a concrete pillar 1 having a crack
The repairing method of 4 will be described. First, the iron plate 15 is wrapped around the concrete pillar 14 to form the joining portion 15a.
Weld with. At this time, the concrete pillar 14 and the iron plate 1
There is a predetermined interval between the first and second terminals.

Reinforcing bars 16 are inserted between the concrete pillars 14 and the iron plate 15 at appropriate intervals. Next, a copper injection pipe 17 is inserted between the concrete pillar 14 and the iron plate 15 and fixed with an adhesive. At the base end of the injection pipe 17,
The high pressure fitting 18 and the nipple 19 are tightened and fixed.

The space in which the reinforcing bars 16 are inserted is filled with non-shrinkage cement grout 20. After the non-shrinkage cement grout 20 is filled and hardened, a plunger pump (not shown) is connected to the injection pipe 17, and an epoxy resin for adhesion is injected.

The low-viscosity epoxy resin is injected until it flows out from a part of the concrete pillar 14. The injection amount is set to about 4 times as a guideline in consideration of the amount flowing out from the crack. The injection pressure should be lower than the strength of concrete. The pressure is set such that the pressure is gradually increased from a low pressure, injection is started at a predetermined pressure, and the pressure at the start of injection is maintained and filling is performed. The high-pressure pump used here uses a plunger pump that can be continuously changed at 1:40. Therefore, it is possible to continuously perform the variable voltage injection in the range of 0 to 280 Kg / cm ² .

Further, since the high-pressure fitting 18 and the nipple 19 are fastened to the base end portion of the injection pipe 17, the connection with the high-pressure pipe of the high-pressure plunger pump becomes easy. After injection of the adhesive epoxy resin, the injection pipe 17
Disconnect and remove. After the removal work, clean the construction site.

As described above, according to the method of repairing a pillar of the present invention,
Since the non-shrinkage cement grout is injected after covering the periphery of the column with an iron plate, the state of connection with the existing concrete surface is good. Further, when the synthetic resin is injected, a low-viscosity epoxy resin having good fluidity is used, so that it has a good impregnation property into a fine crack or a damaged concrete part.

Further, according to the method of repairing the columnar body of the present invention, the damaged columnar body can be easily reinforced as compared with the conventional reinforcing method. Furthermore, compared to the conventional work to reinforce concrete pillars,
It is possible to reduce the number of construction days and costs. Further, since the synthetic resin is injected at a high pressure, even if moisture penetrates the cracks, the low-viscosity epoxy resin penetrates while removing the moisture, and the concrete is repaired.

On the other hand, when the concrete columnar body is severely cracked, it is necessary to repair the inside of the columnar body first. In this case, first, the concrete pillar 14 with cracks
Drill a hole diagonally downward at different heights along the large crack surface. Select the pitch of the holes according to the size of the crack width.

Copper injection pipes are inserted into the holes formed at appropriate intervals, and the vicinity of the surface is sealed with an adhesive and fixed. Further, a high pressure fitting and a nipple are fastened and fixed to the base end portion of the injection pipe. In this way, the injection tube is hermetically fixed in the hole. Further, since the high pressure fitting and the nipple are fastened to the base end portion, connection with a high pressure pipe of a high pressure plunger pump described later becomes easy.

Further, a large crack on the surface of the concrete pillar 14 is cut into a V shape, and concrete pieces are removed and prepared. This pretreatment is performed using a disc grinder or the like.

Putty seal is applied to the site prepared by removing the concrete pieces by V-shaped cutting and preparing with epoxy resin. Then, the putty seal at the V-shaped cut portion is cured and cured. By closing a large crack with a putty seal, it is possible to prevent the low-viscosity underwater-curable epoxy resin that should be injected into the microcrack portion from flowing unnecessarily.

After the putty seal of the V-shaped cut portion and the adhesive for fixing the injection pipe are sufficiently cured, a high pressure plunger pump (not shown) is connected to the injection pipe and a low viscosity underwater curing epoxy resin is injected. The injection pressure should be lower than the strength of concrete. As for setting, the pressure is gradually increased from a low pressure, and filling is performed while maintaining the pressure at the start of inflow. Further, when the synthetic resin is injected, a low-viscosity epoxy resin having good fluidity is used, so that it has a good impregnation property into a fine crack or a damaged concrete part.

Further, after a step of connecting a plunger pump to the injection pipe and injecting a low-viscosity underwater curing type epoxy resin, an iron plate 15 is wound around the column 14 with a predetermined gap over the entire length. Weld. Next, a reinforcing bar 16 is inserted between the concrete pillar 14 and the iron plate 15. The bar arrangement width of the reinforcing bar 16 is appropriately determined depending on the thickness of the column and the degree of cracking.

Another injection pipe 17 is inserted between the concrete pillar 14 and the iron plate 15 at an appropriate position on the iron plate by inserting a hole into the iron plate 15 and fixed with putty or the like. The space in which the reinforcing bar 16 is inserted is filled with non-shrinkage cement grout. After the non-shrinkage cement grout has hardened, a plunger pump is connected to the injection pipe 17 and an adhesive epoxy resin is injected.

In this way, when the columnar body is severely cracked, the concrete columnar body 14 is first repaired with a synthetic resin, and then the periphery is wrapped with an iron plate for reinforcement.

The present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.

[0027]

As described above in detail, according to the method of repairing a pillar body according to the present invention, a step of winding and welding an iron plate around a concrete pillar body having insufficient strength, and the concrete pillar body. Since it comprises a step of inserting a reinforcing bar between the body and the iron plate and a step of filling the space in which the reinforcing bar is inserted with non-shrinkage cement grout, it is possible to effectively enhance the seismic resistance of the column.

[0028] Further, a step of winding and welding an iron plate around the cracked concrete pillar body, and a step of inserting a reinforcing bar between the concrete pillar body and the iron plate.
Inserting an injection pipe between the concrete pillar and the iron plate and fixing it with an adhesive, filling the space in which the rebar is inserted with non-shrinkage cement grout, and connecting a plunger pump to the injection pipe. , The step of injecting the epoxy resin for adhesion is included, so that it is possible to effectively reinforce the concrete pillar body having the crack.

Further, a step of drilling along a large crack surface of a concrete column body having a crack at a different height position, a step of inserting an injection pipe into the hole and fixing with an adhesive, the column body A step of cutting a large crack on the surface into a V shape to prepare it, a step of putting putty on the prepared part by V cutting, a step of curing and curing the putty seal, and a plunger pump for the injection pipe. Connecting, injecting a low-viscosity underwater curing epoxy resin, winding and welding an iron plate with a predetermined gap around the pillar, and reinforcing bars between the concrete pillar and the iron plate A step of inserting, a step of inserting an injection pipe between the concrete pillar and the iron plate and fixing it with an adhesive, a step of filling a non-shrinkage cement grout into the space in which the reinforcing bar is inserted, and the injection pipe. Plunger Connect the pump, since comprising a step of injecting an adhesive epoxy resin, can be effectively reinforced concrete pillar caused crack.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a method of repairing a pillar body according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a reinforcing bar insertion step in a method of repairing a pillar according to an embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a state in which a non-shrinkage cement grout is placed in the method of repairing the columnar body.

FIG. 4 is an explanatory view showing another embodiment of the present invention.

[Explanation of symbols]

 10 Concrete Column 11 Iron Plate 11a Joining Part 12 Reinforcing Bar 13 Non-shrink Cement Grout 14 Concrete Column 15 Iron Plate 15a Joining Part 16 Reinforcing Bar 17 Injection Pipe 18 High Pressure Fitting 19 Nipple 20 Non-shrink Cement Grout

Claims (4)

[Claims] 1. A step of winding and welding an iron plate with a predetermined space around a concrete column body having insufficient strength, and a step of inserting a reinforcing bar into a space between the concrete column body and the iron plate. And a step of filling non-shrinkage cement grout in the space where the reinforcing bars are inserted. 2. A step of wrapping and welding an iron plate around a concrete column body having insufficient strength in a close contact state, and a step of filling a small gap between the concrete column body and the iron plate with an epoxy resin. A method for repairing a column, which is characterized by comprising 3. A step of drilling holes at different heights along a large crack surface of a concrete column having a crack, and a step of inserting an injection pipe into the hole and fixing it with an adhesive.
A step of cutting a large crack on the surface of the columnar body into a V shape for pretreatment, a step of V-cutting to putty seal the site, a step of curing and curing the putty seal, and a plunger for the injection pipe. A step of connecting a pump and injecting a low-viscosity underwater curing epoxy resin, a step of winding and welding an iron plate around the column body, and a step of filling an epoxy resin in a small gap between the iron plate and the column body A method for repairing a pillar, which is characterized by comprising: 4. A step of drilling with a different height position along a large crack surface of a cracked concrete columnar body, and a step of inserting an injection pipe into the hole and fixing with an adhesive.
A step of cutting a large crack on the surface of the columnar body into a V shape for pretreatment, a step of V-cutting to putty seal the site, a step of curing and curing the putty seal, and a plunger for the injection pipe. A step of connecting a pump and injecting a low-viscosity underwater curing epoxy resin, a step of winding and welding an iron plate with a predetermined gap around the column body, and a step between the concrete column body and the iron plate A step of inserting a rebar into the, a step of inserting an injection pipe between the concrete pillar and the steel plate and fixing with an adhesive, a step of filling a non-shrinkage cement grout into the space in which the rebar is inserted, and the injection A method for repairing a pillar, comprising a step of connecting a plunger pump to the pipe and injecting an epoxy resin for adhesion.