JPH094238A - Repair method of cracked or buckled column - Google Patents

Abstract

PURPOSE: To increase strength by a method wherein a low-viscosity water curing type epoxy resin is press-fitted to a cracked section and cured and the strength of concrete is recovered while the periphery of the cracked section is wound with an iron plate and carbon fibers to reinforce it. CONSTITUTION: Holes 13 are bored towards lower sections obliquely while the places of height are made to differ along the large cracked surfaces of a column body 10 made of concrete, in which cracks 11 are generated. Filling pipes 14 are inserted into the holes 13, and sections in the vicinity of surfaces are sealed with adhesives. The large cracks in the surface of the column body 10 are cut in a V shape and sealed with an epoxy resin, and the epoxy resin is cured. High-pressure plunger pumps are connected to the filling pipes 14, a low-viscosity water curing type epoxy resin is infected and finely cracked sections are impregnated with the epoxy resin. An iron plate is wound on the outer circumference of the column body 10 through a concrete layer, and the column body 10 is reinforced. Accordingly, the sections up to the fine cracks can be impregnated effectively with the resin without waste while strength can be increased, and the resin can be executed simply.

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 that is cracked or buckled due to an earthquake or the like.

[0002]

2. Description of the Related Art In general, a pillar body that has been cracked or buckled due to an earthquake or the like has a remarkable deterioration in strength and cannot function as a pillar body, so it has to be removed and reconstructed. .

[0003]

By the way, the above-mentioned conventional construction method in which the concrete columnar body is removed and re-constructed requires a lot of construction days and is economically costly. In addition, when the removed concrete pillars are disposed of, it is a problem for the treatment place.

The object of the present invention was made in view of the above-mentioned conventional drawbacks, and a method of repairing a crack or buckling column body in which a cracked or buckled column body is fixed with a synthetic resin and then repaired with concrete. To provide.

[0005]

A method of repairing a crack or a buckling column body according to the present invention comprises a step of drilling a crack at a different height position along a large crack surface of a concrete column body. And a step of inserting an injection pipe into the perforation and fixing with an adhesive, a step of cutting a large crack on the surface of the columnar body in a V shape to prepare it, and a step of putting putty on the prepared part by V cutting. And a step of curing and curing the putty seal, and a step of connecting a plunger pump to the injection pipe and injecting a low-viscosity underwater-curable epoxy resin.

In the step of drilling the pillar, the drill hole is formed downward at a predetermined angle with respect to the pillar. In addition, removing the concrete piece around the buckling location and repairing the removed location with synthetic resin, winding carbon fiber around the location of the location repaired with synthetic resin, and the buckling location of the concrete pillar A low-viscosity water-curing epoxy resin with a step of drilling diagonally to penetrate the fracture surface from slightly above, a step of inserting an injection tube into the hole and fixing with an adhesive, and a plunger pump connected to the injection tube. And a step of injecting.

In the step of injecting the low-viscosity underwater-curable epoxy resin, high-pressure injection is performed. Also, a plunger pump is connected to the injection pipe, and after the step of injecting a low-viscosity underwater curing epoxy resin, a step of winding an iron plate around the outer periphery of the pillar and reinforcing it with concrete is added. is there.

[0008]

As described above, the method of repairing a crack or a buckling column body according to the present invention is such that an epoxy resin is press-fitted into a crack portion to cure the epoxy resin, and the strength of concrete is restored. Since it is wound and reinforced, the strength can be greatly increased.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 5 are explanatory views showing a method of repairing a crack columnar body which is an embodiment of the present invention. Countless cracks 11 are generated in the concrete pillar 10. This crack 1
1 and the presence of damaged parts were investigated over the entire surface and found to be 0.3 mm
Record all of the above and select the construction method.

First, a hole 13 is formed diagonally downward with a drill 12 at different heights along a large crack surface of a concrete pillar 10 having a crack 11 (see FIG. 3). The pitch of the holes 13 is selected according to the size of the crack width. The drill 12 has a diameter of 19 mm and a length of 250 to 300.
mm.

An injection pipe 14 made of copper is inserted into the holes 13 formed at appropriate intervals, and the vicinity of the surface is sealed with an adhesive 17 and fixed. Further, a high pressure fitting 15 and a nipple 16 are fastened and fixed to the base end portion of the injection pipe 14.
In this way, the injection pipe 14 is fixed to the hole 13 in a sealed state (see FIG. 1). Further, since the high pressure fitting 15 and the nipple 16 are fastened to the base end portion, connection with a high pressure pipe of a high pressure plunger pump described later becomes easy.

Further, the large crack 18 on the surface of the concrete pillar 10 is cut into a V shape, and the concrete piece is removed and prepared (see FIG. 4). This pretreatment is performed using a disc grinder or the like.

[0013] Putty seal is performed with epoxy resin at the site where the V-shaped cutting is performed to remove the concrete pieces and the surface treatment is performed. 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.

V-shaped cut putty seal and injection pipe 14
After the adhesive 17 for fixing is cured sufficiently, a high pressure plunger pump (not shown) is connected to the injection pipe 14 to inject a low-viscosity underwater curing epoxy resin. 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.
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 .

In addition, when the synthetic resin is injected, a low-viscosity epoxy resin having a good fluidity is used, so that it has a good impregnation property into a fine crack or a damaged concrete part.

Further, a plunger pump is connected to the injection pipe 14, and after the step of injecting a low-viscosity underwater curing epoxy resin, an iron plate 25 is wound around the outer periphery of the concrete pillar 10 and reinforced with concrete 26. Thus, when the outer surface is reinforced with the iron plate 25 and the concrete 26, it can be further strengthened.

Further, the repair when the buckling occurs and a crack is generated over the entire circumference of the concrete columnar body 19 will be described (see FIG. 6). First, work to remove the concrete pieces around the buckling points. In this step, the position of the bar and the depth of covering are measured with a metal detector or the like to determine the picking range. After deciding the range, work with a grinder etc. to have a trapezoidal cross section.

Resin mortar 20 is filled in the portion removed by the scrubbing work to restore the cross section. Resin mortar 2
After the curing and curing of 0, the carbon fiber 21 impregnated with the low-viscosity epoxy resin is wound around the outer periphery and cured. here,
The carbon fiber 21 has the same Young's modulus as the reinforcing bar.
With this carbon fiber 21, it is possible to give strength higher than the hoop muscle.

Next, drilling is performed obliquely with respect to the axis at an angle of 30 to 45 degrees so that the fracture surface H is penetrated from slightly above the buckling point of the concrete columnar body 19. The drill used here has, for example, a diameter of 50 mm and a length of 1800 mm, and is drilled at intervals of 1 m.

An injection pipe 23 made of copper is inserted into the perforations 22 formed at an appropriate pitch, and the inlet portion is fixedly sealed with an adhesive 24. Further, the high pressure fitting 15 and the nipple 16 are fastened and fixed to the base end portion of the injection pipe 23.

A plunger pump (not shown) is connected to the injection pipe 23 to inject a low-viscosity underwater curing type epoxy resin at high pressure. At this time, press-fitting is performed until the injected low-viscosity water-curable epoxy resin flows out from the microcracks. As described above, the injection is performed by gradually increasing the pressure from a low pressure, and maintaining the pressurized state.

As described above, according to the method for repairing the crack or the buckling column of the present invention, it is possible to reinforce the damaged portion more easily than the conventional reinforcing method. In addition, it is possible to reduce the number of work days and the cost as compared with the conventional construction method in which the concrete pillars are removed and reconstructed. Furthermore, there is no need to dispose of the removed concrete pillar, and there is no fear of pollution problems.

The present invention is not limited to the above-described embodiment, and various design changes can be made based on the technical concept of the present invention.

[0024]

As described in detail above, according to the crack or buckling column repairing method of the present invention, the height position is changed along the large crack surface of the concrete column body having the crack. Drilling the holes, inserting the injection pipe into the holes and fixing it with an adhesive, cutting large cracks on the surface of the column in a V shape and preparing it, and cutting it by V to prepare it. Since it consists of a step of putting putty seal on the part, a step of curing and curing the putty seal, and a step of connecting a plunger pump to the injection pipe and injecting a low-viscosity underwater curing epoxy resin, it is made of cracked concrete. The strength of the pillar can be easily increased.

In the step of drilling the pillar, the drill hole is formed downward at a predetermined angle with respect to the pillar, so that the low-viscosity underwater-curable epoxy resin to be injected is effective even for fine cracks. It can be impregnated with water.

A step of removing the concrete piece on the outer periphery of the buckling portion and repairing the removed portion with a synthetic resin;
The process of winding carbon fiber around the area repaired with synthetic resin, the step of drilling diagonally so as to penetrate the fracture surface from slightly above the buckling point of the concrete column, and the injection pipe inserted into the hole. If it consists of the process of fixing with an adhesive and the process of connecting a plunger pump to the injection pipe and injecting a low-viscosity underwater curing epoxy resin, the buckling point is reinforced with carbon fiber so the strength of the buckling part Can be increased.

Further, since the low-viscosity underwater-curable epoxy resin is injected at high pressure, the resin can be penetrated even into minute cracks. Further, after the step of injecting the low-viscosity underwater-curable epoxy resin, an iron plate is wound around the column body and reinforced with concrete, so that high strength can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method of repairing a crack columnar body which is an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a repair method for a crack columnar body which is an embodiment of the present invention.

FIG. 3 is an explanatory view showing a repairing method for the crack columnar body.

FIG. 4 is an explanatory diagram showing a method of repairing the same crack pillar.

FIG. 5 is an explanatory view showing a repairing method for the crack columnar body.

FIG. 6 is an explanatory view showing a method of repairing the buckling column body.

[Explanation of Codes] 10 Concrete Column 11 Crack 12 Drill 13 Hole 14 Injection Pipe 15 High Pressure Fitting 16 Nipple 17 Adhesive 18 Crack 19 Concrete Column 20 Resin Mortar 21 Carbon Fiber 22 Perforation 23 Injection Pipe 24 Adhesive 25 Iron Plate

Claims (5)

[Claims] 1. A step of drilling along a large crack surface of a cracked concrete columnar body at different height positions, 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 pillar into a V shape for pretreatment, a step of V-cutting and putting putty seal on the portion, a step of curing and curing the putty seal, and a plunger for the injection pipe. A method for repairing a crack or a buckling column body, which comprises a step of connecting a pump and injecting a low-viscosity underwater curing epoxy resin. 2. The repair of the crack or buckling column body according to claim 1, wherein in the step of drilling the column body, the drill hole is formed downward at a predetermined angle with respect to the column body. Method. 3. A step of removing a concrete piece on the outer periphery of a buckling point and repairing the removed point with a synthetic resin,
The process of winding carbon fiber around the area repaired with synthetic resin, the step of drilling diagonally so as to penetrate the fracture surface from slightly above the buckling point of the concrete column, and the injection pipe inserted into the hole. A method of repairing a buckling column body, which comprises a step of fixing with an adhesive and a step of connecting a plunger pump to an injection pipe and injecting a low-viscosity underwater curing epoxy resin. 4. The method of repairing a crack or a buckling column body according to claim 1, wherein in the step of injecting the low-viscosity underwater-curable epoxy resin, it is injected at a high pressure. 5. A step of connecting a plunger pump to the injection pipe, injecting a low-viscosity underwater-curable epoxy resin, and, after the step of winding an iron plate around the outer periphery of the column and reinforcing it with concrete, are added. A method for repairing a crack or a buckling column body according to claim 1 or 3.