JP2018071302A - Method for reinforcing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reinforcing a concrete structure which can perform reinforcement after repair of a concrete structure repaired by filling cracks with a filler with a simple method at low cost.SOLUTION: A method for reinforcing a concrete structure 1 includes injecting and filling cracks 2 generated on the surface with a filler 3 to repair the cracks includes: forming a groove 4 for reinforcement on the surface of the concrete structure 1 so as to cross the repaired cracks 2; arranging a reinforcement bar material 6 in the groove 4 for reinforcement; filling the groove 4 for reinforcement with a fixing agent 10 formed of a curable resin composition; and fixing the reinforcement bar material 6 into the groove 4 for reinforcement by curing of the fixing agent 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for reinforcing a concrete structure in which a repair agent is injected and filled into a crack generated on the surface of a concrete structure such as a building, a bridge, a tunnel, and a pipe fence.

  As a method of repairing cracks generated on the surface of concrete structures due to deterioration due to aging, ground deformation, earthquake damage, fatigue due to load, etc., the crack surface is covered with a sheet etc. and covered with a sheet etc. with an injector A repair method is often used in which a filler made of a curable resin composition is injected into a crack and filled (see, for example, Patent Documents 1 and 2).

  Also, as a method of reinforcing the surface of concrete structures, a fiber reinforced resin mesh is placed on the surface of the structure via a spacer and fixed with anchor bolts, and anchor bolts and fibers are reinforced on the surface of the concrete structure. A reinforcing method for forming a mortar layer so as to embed a reticulated reinforcing material made of resin is known (for example, see Patent Document 3).

JP 2015-110862 A JP, 2006-56607, A JP 2013-79517 A

  However, the concrete structure repair methods described in Patent Documents 1 and 2 do not necessarily lead to reinforcement of the repaired concrete structure. Specifically, the development (spreading) of cracks caused by the load cannot be positively suppressed with respect to the load in the crack spreading direction generated on the surface of the concrete structure.

  As a method for reinforcing the surface of a concrete structure, there is a reinforcing method described in Patent Document 3, but this method is not only large and expensive, but also injects a filler made of a curable resin composition into cracks. However, there is no repair to be filled, and if it is a crack, it remains in a cracked state, so there is a risk of water intrusion from the crack.

  The inventors of the present invention have conducted research to make it possible to reinforce a concrete structure that has been repaired by filling a crack with a filler in a simple manner and at a low cost. The inventors have conceived of embedding reinforcing bars on the surface and have come to achieve the present invention.

  It is an object of the present invention to provide a method for reinforcing a concrete structure that can reinforce a concrete structure that has been repaired by filling a crack with a filler in a simple manner and at a low cost.

  In order to achieve the above object, the invention described in claim 1 is a method for reinforcing a concrete structure in which a filler is injected and filled into a crack generated on the surface, and the surface of the concrete structure is repaired. A reinforcing groove is formed so as to cross the repaired crack, a reinforcing bar is disposed in the reinforcing groove, and the reinforcing groove is filled with a fixing agent made of a curable resin composition. The reinforcing reinforcing material is fixed in the reinforcing groove by curing.

  The invention according to claim 2 is characterized in that the reinforcing reinforcing bar material according to claim 1 is made of metal.

  According to a third aspect of the present invention, the reinforcing reinforcing material according to the first aspect is made of a synthetic resin.

  The invention according to claim 4 is the rope according to claim 1, wherein the reinforcing reinforcing material is a rope knitted with chemical fibers, and the curable resin composition serving as the fixing agent is a low viscosity curable resin composition. The injection hole reaching the rope at an appropriate position of the sealing material, wherein the rope is disposed in the reinforcing groove, the opening of the reinforcing groove is closed with a sealing material, and the opening of the reinforcing groove is closed A low-viscosity curable resin composition is injected from the injection hole to penetrate the rope and flow in the length direction of the rope to fill the reinforcing groove, The rope is fixed in the reinforcing groove by curing.

According to the method for reinforcing a concrete structure according to claim 1, a reinforcing groove is formed on the surface of the concrete structure so as to cross the crack filled with a filler, and the reinforcing groove is reinforced in the reinforcing groove. Since the reinforcing material is disposed, the reinforcing groove is filled with a fixing agent made of a curable resin composition, and the reinforcing reinforcing material is fixed in the reinforcing groove by curing the fixing material. It becomes a reinforcing bar and suppresses the progress (spreading) of the repaired crack generated on the surface of the concrete structure, and the concrete structure can be reinforced.
Further, in this reinforcing method, a reinforcing groove is formed on the surface of the concrete structure, a reinforcing bar material is disposed in the reinforcing groove, and the reinforcing groove is filled with a fixing agent made of a curable resin composition. Since it can be performed by a simple process such as, it is easy to implement and can be performed at low cost.

  According to the method for reinforcing a concrete structure according to claim 2, since the reinforcing bar material according to claim 1 is a metal, the reinforcing bar has strength as a reinforcing bar, and the repaired crack progresses (spreads). Can be suppressed.

  According to the method for reinforcing a concrete structure according to claim 3, since the reinforcing bar material according to claim 1 is made of a synthetic resin, it is lightweight and is disposed and fixed in the reinforcing groove. Etc. can be easily performed.

According to the method for reinforcing a concrete structure according to claim 4, the reinforcing reinforcing material is a rope knitted with chemical fibers, and the curable resin composition serving as the fixing agent is a low viscosity curable resin composition. The injection hole reaching the rope at an appropriate position of the sealing material, wherein the rope is disposed in the reinforcing groove, the opening of the reinforcing groove is closed with a sealing material, and the opening of the reinforcing groove is closed A low-viscosity curable resin composition is injected from the injection hole to penetrate the rope and flow in the length direction of the rope to fill the reinforcing groove, Since the rope is fixed in the reinforcing groove by curing, the penetration type repair agent impregnated in the rope is cured to become a cured rope and exert a function as a reinforcing bar. Table of concrete structures The progress of the cracking that occurred (spread) can be suppressed.
In addition, since the reinforcing reinforcing material is a rope knitted with chemical fibers, it is possible to easily perform an arrangement operation or a fixing operation in the reinforcing groove.

It is a perspective view which shows an example of the concrete structure which injected and filled the filler to the crack which generate | occur | produced on the surface and was repaired. It is explanatory drawing which shows the process of an example of embodiment which implements the reinforcement method of the concrete structure which concerns on this invention for reinforcement of the concrete structure shown in FIG. It is an AA expanded sectional view of FIG. It is explanatory drawing which shows the process of an example of embodiment which implements the reinforcement method of the concrete structure which concerns on this invention for reinforcement of the concrete structure shown in FIG. It is BB expanded sectional drawing of FIG. It is explanatory drawing which shows the process of an example of embodiment which implements the reinforcement method of the concrete structure which concerns on this invention for reinforcement of the concrete structure shown in FIG. It is explanatory drawing which shows the process of an example of embodiment which implements the reinforcement method of the concrete structure which concerns on this invention for reinforcement of the concrete structure shown in FIG. It is CC sectional drawing of FIG. It is DD expanded sectional drawing of FIG. It is explanatory drawing which shows the process of an example of embodiment which implements the reinforcement method of the concrete structure which concerns on this invention for reinforcement of the concrete structure shown in FIG.

Hereinafter, the form for enforcing the reinforcing method of the concrete structure concerning the present invention is explained in detail.
1 to 10 show an example of a method for reinforcing a concrete structure according to the present invention, FIG. 1 is a perspective view showing an example of a concrete structure with cracks on its surface, and FIG. 2 is a concrete structure shown in FIG. FIG. 3 is an AA enlarged sectional view of FIG. 2 and FIG. 4 is an explanatory view showing a process of implementing this example for reinforcing the concrete structure shown in FIG. 5 is an enlarged cross-sectional view taken along the line B-B of FIG. 4, FIG. 6 is an explanatory view showing a process for carrying out this example to reinforce the concrete structure shown in FIG. 1, and FIG. 7 is a reinforcement of the concrete structure shown in FIG. FIG. 8 is an enlarged sectional view taken along the line CC in FIG. 7, FIG. 9 is an enlarged sectional view taken along the line DD in FIG. 7, and FIG. 10 is a reinforcement of the concrete structure shown in FIG. It is explanatory drawing which shows the process of implementing this example.

The method for reinforcing a concrete structure according to the present invention is performed in the following steps.
FIG. 1 shows an example of a concrete structure 1 reinforced by the present invention, in which a filler 3 is injected and filled into a crack 2 generated on the surface and repaired.
As a preliminary preparation, if the surface of the concrete structure 1 is dirty, the periphery of the crack 2 is washed to remove dust attached to the surface.

Next, a reinforcing groove 4 is formed on the surface of the concrete structure 1 so as to cross the repaired crack 2.
The reinforcing groove 4 formed so as to cross the crack 2 is preferably formed so as to be orthogonal to the crack 2. The length of the reinforcing groove 4 is not particularly limited, but is preferably at least half the length of the crack 2 in terms of strength. Further, it is preferable to form a plurality of reinforcing grooves 4 at predetermined intervals in the length direction of the crack 2 according to the length of the crack 2. In addition, the width and depth of the reinforcing groove 4 are formed to have a width and depth in which a reinforcing bar disposed in the reinforcing groove 4 described later can be completely accommodated.

  In this process, air vent holes 5 are formed in the concrete structure 1 so as to communicate with the groove bottoms at both ends in the length direction of the reinforcing groove 4 from the surface (see FIG. 2).

Next, the reinforcing bars 6 are arranged according to the length of the reinforcing groove 4 (see FIGS. 4 and 5).
The reinforcing bar material 6 is not particularly limited as long as it has a bending strength and a tensile strength and can exhibit a function as a reinforcing bar. As the reinforcing reinforcing material 6, in addition to a synthetic resin wire or rod made of metal or carbon fiber, a rope knitted with chemical fibers such as glass fiber, carbon fiber, aramid fiber, polyethylene fiber is used as the reinforcing reinforcing material. 6 can be used. When a rope knitted with chemical fibers is used as the reinforcing reinforcing material 6, as described later, the reinforcing reinforcing material 6 made of rope is impregnated with an osmotic repair agent, and the reinforcing reinforced material is cured as the reinforcing reinforcing material. Make it work.
In this example, a rope knitted with chemical fibers is used as the reinforcing bar 6. This rope includes a hose.

Next, the opening of the reinforcing groove 4 is closed with the sealing material 7, and the reinforcing bar 6 is held in the reinforcing groove 4. The sealing material 7 is not particularly limited as long as it can liquid-tightly close the opening of the reinforcing groove 4. As the sealing material 7, for example, a tape used in a conventional method for repairing a concrete structure may be used, and the tape may be attached to the opening of the reinforcing groove 4 to close it. A viscosity curable resin composition or cement-based mortar may be used as the sealing material 7 and the reinforcing groove 4 may be filled to close the opening.
In this example, a high-viscosity curable resin composition 8 is used as the sealing material 7 (see FIG. 6).

  In the high viscosity curable resin composition 8, an epoxy resin, an acrylic resin, an unsaturated polyester resin, a silicon resin, or the like is used. The viscosity of the high-viscosity curable resin composition 8 is preferably a viscosity that can reliably close the opening of the reinforcing groove 4 without dropping from the opening of the reinforcing groove 4.

Next, when the sealing material 7 made of the high-viscosity curable resin composition 8 that closes the opening of the reinforcing groove 4 is cured, the low-viscosity curable resin composition that serves as a fixing agent, which will be described later, is placed at an appropriate position of the sealing material 7. An injection hole 9 for injecting an object is drilled. The injection hole 9 can feed the curable resin composition between the reinforcing groove 4 and the reinforcing reinforcing material 6 arranged in the reinforcing groove 4.
The injection hole 9 is drilled at an appropriate position in the length direction of the sealing material 7 blocking the opening of the reinforcing groove 4. For example, it is provided at the center position in the length direction of the sealing material 7 or at one end side. When the reinforcing groove 4 is long, it may be formed at a plurality of locations (see FIG. 7).

In the middle of any of the above-described steps, the concrete structure 1 is drilled with air vent holes 5 communicating from the surface to the groove bottoms at both ends of the reinforcing groove 4 (see FIG. 2).
In this example, the air vent hole 5 is formed in the step of forming the reinforcing groove 4 on the surface of the concrete structure 1 as described above.

Next, a low-viscosity curable resin composition serving as a fixing agent 10 for fixing the reinforcing reinforcing material 6 is injected into the reinforcing groove 4 from the injection hole 9 using an appropriate injector. The reinforcing reinforcing material 6 made of a rope knitted with the arranged chemical fiber is infiltrated and made to flow in the longitudinal direction of the reinforcing reinforcing material 6 to impregnate the reinforcing reinforcing material 6 and the reinforcing groove 4 and the reinforcing reinforcing material. It fills between the materials 6 (refer FIG. 10).
In injecting the fixing agent 10 from the injection hole 9, a fixing device such as an aspirator is connected to the air vent hole 5, and the inside of the reinforcing groove 4 whose opening is closed is reduced while reducing the amount of the fixing agent. 10 injections can be performed easily and in a short time.

  When the reinforcing bar 6 is a wire or bar made of a metal or a synthetic resin made of carbon fiber or the like, the fixing agent 10 is fed between the reinforcing groove 4 and the reinforcing bar 6 to reinforce the reinforcing groove 4 and the reinforcing bar. By flowing between the reinforcing material 6, the fixing agent 10 is filled between the reinforcing groove 4 and the reinforcing reinforcing material 6.

The fixing agent 10 is injected into the reinforcing groove 4 until the fixing agent 10 flows from the air vent holes 5 communicating with the groove bottoms at both ends of the reinforcing groove 4 formed in the concrete structure 1.
When the fixing agent 10 flows from the air vent hole 5, it can be confirmed that the fixing agent 10 is filled between the reinforcing groove 4 and the reinforcing reinforcing material 6.

  The low-viscosity curable resin composition used here as the fixing agent 10 is a low-viscosity curable resin composition mainly composed of an epoxy resin, an acrylic resin, an unsaturated polyester resin, or the like. The viscosity of the low-viscosity curable resin composition is preferably 200 to 700 mPa · s / 20 °.

  When the fixing agent 10 is injected from the injection hole 9 in this way, it is cured until the fixing agent 10 is cured. When the fixing agent 10 is cured, when the sealing material 7 is a tape, the tape is removed from the surface of the concrete structure 1, and when the sealing material 7 is the high viscosity curable resin composition 8, the concrete structure is left as it is. 1 reinforcement is completed.

  According to the method of reinforcing a concrete structure comprising the above steps, the surface of the concrete structure 1 that has been repaired by injecting and filling the filler 2 into the crack 2 generated on the surface is used for reinforcement so as to cross over the repaired crack 2. The groove 4 is formed, the reinforcing bar 6 is disposed in the reinforcing groove 4, the opening of the reinforcing groove 4 is closed with the sealing material 7, and the injection hole 9 is formed at a suitable position of the sealing material 7. Since the fixing agent 10 made of the low-viscosity curable resin composition is injected, the injected fixing agent 10 flows in the length direction of the reinforcing reinforcing material 6 while penetrating into the reinforcing reinforcing material 6, and the fixing agent 10 is strengthened. The material 6 is impregnated and filled between the reinforcing groove 4 and the reinforcing bar 6.

  In this way, the reinforcing reinforcing material 6 is fixed in the reinforcing groove 4 by hardening the fixing agent 10 impregnated in the reinforcing reinforcing material 6 and filled between the reinforcing groove 4 and the reinforcing reinforcing material 6. Therefore, the reinforcing bar 6 impregnated with the fixing agent 10 functions as a reinforcing bar, and the reinforcing bar 6 which has become the reinforcing bar causes the progress (spread) of the crack 2 generated on the surface of the concrete structure 1. Suppress.

  In this example, since the sealing material 7 is the high-viscosity curable resin composition 8, the reinforcing groove is formed by a simple operation such as filling the reinforcing groove 4 formed on the surface of the concrete structure 1 with the sealing material 7. 4 can be closed, and since the sealing material 7 has high viscosity, the opening of the reinforcing groove 4 can be reliably closed without dropping from the opening of the reinforcing groove 4.

  And after the fixing agent 10 pressurized and injected from the injection hole 9 provided in the hardened sealing material 7 closing the opening of the reinforcing groove 4 is hardened, it is necessary to peel off the sealing material 7 from the concrete structure 1. It can be left as it is.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Crack 3 Filler 4 Reinforcing groove 5 Air vent hole 6 Reinforcement reinforcing material 7 Seal material 8 High viscosity curable resin composition 9 Injection hole 10 Fixing agent

Claims (4)

  A method of reinforcing a concrete structure that has been repaired by injecting and filling a filler into a crack generated on a surface, wherein a reinforcing groove is formed on the surface of the concrete structure so as to cross the repaired crack, A reinforcing reinforcing material is disposed in the reinforcing groove, the fixing groove is filled with a fixing agent made of a curable resin composition, and the reinforcing reinforcing material is fixed in the reinforcing groove by curing the fixing agent. A method for reinforcing a concrete structure characterized by the above.   The method for reinforcing a concrete structure according to claim 1, wherein the reinforcing reinforcement is made of metal.   The method for reinforcing a concrete structure according to claim 1, wherein the reinforcing reinforcement is made of synthetic resin. The reinforcing reinforcing material is a rope knitted with chemical fibers, the curable resin composition serving as the fixing agent is a low viscosity curable resin composition, the rope is disposed in the reinforcing groove, The opening of the reinforcing groove is closed with a sealing material, and an injection hole reaching the rope is provided at an appropriate position of the sealing material closing the opening of the reinforcing groove, and a low-viscosity curable resin composition is injected from the injection hole. The rope is infiltrated and flows in the length direction of the rope to fill the reinforcing groove, and the rope is fixed in the reinforcing groove by curing of the low viscosity curable resin composition. The method for reinforcing a concrete structure according to claim 1.

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