JP2016089528A - Shear reinforcement method for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a shear reinforcement method of a concrete structure that can make a reinforcement steel bar be anchored in a state that it is penetrating through the concrete structure by construction from a single side of the concrete structure.SOLUTION: A box culvert 1 is reinforced by: forming insertion hole 2 that penetrates the box culvert 1 from the inner side toward the external side; inserting into the insertion hole 2 a reinforcement member 10 including a core material 10b of a pipe shape and a bag body 10c capable of expanding in the front-end side of the core material 10b; supplying a solidification material 20 into the bag body 10c placed at a position penetrating the box culvert 1 via the core material 10b to inflate the bag body 10c; and forming an anchorage body 30 outside the box culvert 1, thereby anchoring the core material 10b in a state of penetrating the box culvert 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shear reinforcement method for reinforcing an existing concrete structure on which a shearing force acts.

2. Description of the Related Art Conventionally, there has been known a method in which reinforcing steel bars are inserted into an insertion hole formed in an existing concrete structure, and a filler is filled in the insertion hole to achieve seismic reinforcement of the concrete structure (for example, Patent Documents). 1).
In addition, in order to provide seismic reinforcement of the concrete structure, an insertion hole that penetrates the concrete structure is formed, and a reinforcing bar having a fixing member having a large cross-sectional shape at one end is inserted from one side of the concrete structure. A technique is known in which a fixing member having a large cross-sectional shape is attached to the other end portion of the reinforcing reinforcing bar protruding to the other side of the concrete structure, and a filler is filled in the insertion hole (for example, a patent) Reference 2).

JP 2008-280760 A JP 2006-57265 A

However, in the case of the above-mentioned Patent Document 1, the insertion hole does not penetrate to the ground side, and the reinforcement reinforcing bar inserted into the insertion hole cannot be fixed in a state of passing through the concrete structure. It is not a fully utilized reinforcement.
Moreover, in the case of the above-mentioned patent document 2, although it can be fixed in a state where the reinforcing steel bars are penetrated through the concrete structure, it is limited to construction at the site where work can be performed on both the inside and outside of the concrete structure. Therefore, for example, it could not be applied to the reinforcement of a concrete structure in which the back surface is in contact with the ground in Patent Document 1 described above.

  An object of the present invention is to provide a method for shear reinforcement of a concrete structure that can be fixed in a state where a reinforcing steel bar penetrates the concrete structure by construction from one side of the concrete structure.

In order to achieve the above object, the present invention provides:
A shear reinforcement method for reinforcing an existing concrete structure,
Forming an insertion hole penetrating from one side of the concrete structure to the opposite side;
A reinforcing member is inserted into the insertion hole, and a fixing member is provided at a position where a part of the reinforcing member penetrates the concrete structure so as to be larger than the diameter on the opposite surface side of the insertion hole. Process,
Filling the insertion hole with a filler;
I was prepared to.

With the shear reinforcement method having such a configuration, the reinforcement member can be fixed in a state of being penetrated through the concrete structure by construction from one side (for example, the inside) of the concrete structure, so that the strength of the reinforcement member is sufficient. It can be used for reinforcing concrete structures.
In addition, the one side of the concrete structure referred to here is, for example, the inside of the concrete structure where an operator can reinforce the concrete structure, and the opposite side of the concrete structure is It is the outside (back side) of a concrete structure filled with earth or sand, or the outside (back side) of a concrete structure filled with water.

Also, preferably
The reinforcing member has a pipe-shaped core material and a bag body that is inflatable on the tip side of the core material,
The step of disposing the fixing body includes
A step of supplying a solidifying material into the bag through the core and forming the fixing body is included.
For example, a reinforcing member is inserted into the insertion hole, a solidifying material is supplied into a bag placed in a position penetrating the concrete structure, and a fixing body is formed outside the concrete structure so as to inflate the bag. Therefore, it is possible to reinforce the concrete structure by fixing the core material through the concrete structure.

Also, preferably
The step of forming the insertion hole includes:
Forming a drilling hole that does not penetrate the concrete structure on one side of the concrete structure;
Attaching a water stop packer having a water stop valve to the excavation hole, and forming a through hole leading to the opposite surface side of the concrete structure in the back of the excavation hole by a drilling tool that passes through the water stop valve; Was included.
For example, if the procedure is to form a through-hole in the back of the excavation hole with a water-stop packer attached to the excavation hole, the insertion hole is formed without fear of intrusion of groundwater inside the concrete structure. can do.

Also, preferably
A chemical solution injection pipe through the water stop valve is used to inject a water stop agent into the opposite surface side of the concrete structure through the through hole to form a water stop body formed by modifying the ground. .
For example, if the ground outside the concrete structure is modified to form a waterstop, the reinforcement member is installed in the insertion hole without fear of intrusion of groundwater inside the concrete structure. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, it can fix by the construction from the single side | surface of a concrete structure in the state which made the reinforcement reinforcement penetrated the concrete structure.

It is sectional drawing which shows the box culvert reinforced with the shear reinforcement method of the concrete structure of this embodiment. It is process drawing (a)-(e) which shows the procedure which reinforces a box culvert by the shear reinforcement method of the concrete structure of Embodiment 1. FIG. It is a perspective view which shows the modification of a reinforcement member. It is process drawing (a) (b) which shows the procedure which reinforces a box culvert using the reinforcement member from which a structure differs. It is process drawing (a)-(d) which shows the procedure which reinforces a box culvert by the shear reinforcement method of the concrete structure of Embodiment 2. FIG. It is process drawing (a) (b) which shows the procedure which reinforces a box culvert using the reinforcement member from which a structure differs.

  Hereinafter, an embodiment of a shear reinforcement method for a concrete structure according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a box culvert 1 which is an existing concrete structure.
Since a shearing force acts on the box culvert 1 buried in the ground, reinforcement is performed by arranging a core material as a shear reinforcing bar on the box culvert 1.

In the box culvert 1 shown in FIG. 1, a core member 10 b that is a reinforcing reinforcing bar penetrating the box culvert 1 and one end portion of the core member 10 b protruding to the outside of the box culvert 1 are fixed to the outer surface of the box culvert 1. A fixing member 30 and a shear reinforcement structure 100 having a fixing plate 50 for fixing the other end of the core member 10b to the inner surface of the box culvert 1 inside the box culvert 1 are attached. Thus, the box culvert 1 is reinforced.
The shear reinforcement structure 100 is attached to the box culvert 1 by an operator entering the space inside the box culvert 1 embedded in the ground and being constructed from the inside.

  The box culvert 1 buried in the ground is used as an underpass (sidewalks and roadways), as well as a wide variety of uses such as sewage and drainage pipes and communication line pipes that accommodate communication cables. It is a concrete structure that can be done.

  A procedure for reinforcing the box culvert 1 by the shear reinforcement method of the present embodiment will be described with reference to FIGS.

First, as shown in FIG. 2A, an excavation hole 2a that does not pass through the box culvert 1 is formed inside the box culvert 1, and a water-stop packer 3 is attached to the excavation hole 2a.
The water stop packer 3 is, for example, a donut-shaped injection bag, and has a water stop valve 3a at the center thereof. This water-stop packer 3 is a water-stopping tool that is used by injecting a gas or liquid into the inside thereof and inflating it, and a known water-stop packer can be used.

Next, as shown in FIG. 2 (b), a through hole 2b leading to the outside of the box culvert 1 is formed in the back of the excavation hole 2a by an excavation tool (not shown) through the water stop valve 3a of the water stop packer 3. To do.
Thus, the insertion hole 2 penetrating from the inner side to the outer side of the box culvert 1 is formed so as to sequentially form the excavation hole 2a and the through hole 2b having a smaller diameter than the excavation hole 2a.
Even when the ground G outside the box culvert 1 contains a lot of groundwater, the water-stopping packer 3 is attached to the excavation hole 2a, so that it is difficult for the groundwater to enter the box culvert 1.

Next, as shown in FIG. 2 (c), the reinforcing member 10 is inserted into the insertion hole 2 through the water stop valve 3 a of the water stop packer 3.
The reinforcing member 10 includes a core member 10b in which a nut-shaped stopper 10a is screwed at a tip end portion, and a bag body 10c that is inflatable on the tip end side of the core member 10b. The core material 10b is a pipe-like member and is made of a known material such as steel. The bag body 10c is, for example, a rubber balloon-like member, and is covered with the stopper 10a and the core material 10b. The stopper 10a has a size larger than that of the core member 10b.
The reinforcing member 10 is inserted into the insertion hole 2 so that the stopper 10a on the distal end side reaches the position where the outer end of the box culvert 1 penetrates.
In addition, when it can be confirmed that the groundwater does not enter from the ground G when the through hole 2b is formed, the water blocking packer 3 may be removed and the reinforcing member 10 may be inserted into the insertion hole 2. Further, when it is confirmed in advance that the moisture content of the ground G outside the box culvert 1 is low, the through hole 2 b can be formed without using the water stop packer 3.

Next, as shown in FIG. 2 (d), the solidifying material 20 is supplied into the bag body 10 c on the distal end side of the core material 10 b through the core material 10 b to inflate the bag body 10 c, and the outer diameter of the insertion hole 2. In other words, the fixing body 30 that is larger than the diameter of the through hole 2b is disposed. When the water-stop packer 3 is used, the water-stop packer 3 may be removed after the fixing body 30 is disposed.
As the solidifying material 20, for example, mortar, curable resin, or the like can be used. Then, the solidifying material 20 having fluidity is injected into the bag body 10c on the tip side through the pipe-shaped core member 10b and then solidified.

Next, as shown in FIG. 2E, the solidified material 20 injected into the bag body 10c is solidified to form the fixing body 30 integrated with the core material 10b. The fixing body 30 is composed of a bag body 10 c and a solidifying material 20, and has a function of fixing the leading end portion (prevention tool 10 a) of the core material 10 b to the outer surface of the box culvert 1.
In addition, the core member 10 b is difficult to come out inside the box culvert 1 by restraining the stopper 10 a in the solidified solidified material 20.
Further, the filler 40 is filled into the insertion hole 2 (excavation hole 2a, through hole 2b). For example, mortar or concrete can be used as the filler 40.
After the filler 40 is cured, the fixing plate 50 is fixed to the rear end portion of the core material 10b.
With such a procedure, the shear reinforcement structure 100 can be attached to the box culvert 1, and the box culvert 1 can be reinforced.

  Thus, the construction from one side of the box culvert 1 can fix the core material 10b, which is a reinforcing reinforcing bar, penetrating the box culvert 1, and the strength of the core material 10b can be fully utilized, The box culvert 1 can be reinforced.

The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 3, 4 (a) and 4 (b), a pipe-shaped core material 10 b in which a plurality of (here, four) openings 10 d are formed on the tip side, and a hollow portion of the core material 10 b You may use the reinforcement member 10 which has the bag 10c accommodated in this. In addition, the stopper 10a wider than the diameter of the core material 10b is screwed to the front end portion of the core material 10b so as to block the front end opening of the core material.

Such a reinforcing member 10 is inserted into the insertion hole 2 through the water stop valve 3a of the water stop packer 3 as shown in FIG.
The reinforcing member 10 is also inserted into the insertion hole 2 so that the stopper 10a on the distal end side reaches a position where the outer end of the box culvert 1 penetrates.

Next, as shown in FIG. 4B, the solidifying material 20 is supplied into the bag body 10c on the tip side of the core material 10b through the core material 10b. The bag 10c filled with the fluidized solidifying material 20 swells and expands from the opening 10d of the core member 10b, and expands larger than the outer diameter of the insertion hole 2 (that is, the diameter of the through hole 2b). A fixing body 30 is formed.
And the fixing body 30 integrated with the core material 10b can be formed by solidifying the solidifying material 20 injected into the bag 10c.
After the fixing body 30 is formed, the water-stop packer 3 is removed as appropriate, the filler 40 is filled into the insertion hole 2, and after the filler 40 is cured, the fixing plate 50 is fixed to the rear end of the core member 10b. Is fixed.

Even with such a method, the shear reinforcement structure 100 can be attached to the box culvert 1 and the box culvert 1 can be reinforced.
In particular, in the reinforcing member 10, the bag body 10 c is accommodated in the hollow portion of the core member 10 b, so that, for example, when the reinforcing member 10 is inserted into the insertion hole 2, the bag body 10 c is formed on the inner wall of the insertion hole 2. It will not be damaged by rubbing.

(Embodiment 2)
Next, a second embodiment of the shear reinforcement method for a concrete structure according to the present invention will be described. In addition, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is omitted.

  As a procedure for reinforcing the box culvert 1 by the shear reinforcement method of the second embodiment, first, similarly to the first embodiment, an excavation hole 2a that does not penetrate the box culvert 1 is formed inside the box culvert 1, and then the excavation hole 2a is formed. After the water-stop packer 3 is attached, a through-hole 2b leading to the outside of the box culvert 1 is formed in the back of the excavation hole 2a (see FIGS. 2A and 2B).

Next, as shown in FIG. 5A, the chemical liquid injection pipe 5 is inserted into the insertion hole 2 through the water stop valve 3 a of the water stop packer 3. The chemical solution ejection port 5 a on the distal end side of the chemical solution injection pipe 5 reaches a position penetrating outside the box culvert 1.
And the water-stopping agent 6 is inject | poured on the outer side of the box culvert 1 through the through-hole 2b so that the water-stopping agent 6 may be injected from the chemical | medical-solution injection port 5a, rotating the chemical | medical solution injection pipe 5, and the ground G and the water-stopping agent are injected. 6 is mixed.

Next, as shown in FIG. 5B, a waterstop 6 g formed by modifying the ground G with the waterstop 6 around the outer through hole 2 b of the box culvert 1 is formed.
After the water stop 6g is formed, the water stop packer 3 is removed.

  Next, as shown in FIG. 5 (c), the insertion hole 2 is expanded by digging the excavation hole 2a with an excavation tool (not shown) and excavated to a part of the waterstop body 6g.

Next, as shown in FIG. 5 (d), the reinforcing member 10 is inserted into the insertion hole 2 so that the stopper 10 a on the distal end side reaches the position where it penetrates outside the box culvert 1.
Then, the solidified material 20 is supplied into the bag body 10c on the distal end side of the core material 10b through the core material 10b to inflate the bag body 10c, and is expanded larger than the outer diameter of the insertion hole 2. 30 is disposed. In addition, the fixing body 30 integrated with the core material 10b can be formed by solidifying the solidifying material 20 injected into the bag body 10c. The bag 10c is fixed to the outer peripheral surface of the core member 10b by a fixing ring 10e.
After the fixing body 30 is formed, the filler 40 is filled into the insertion hole 2, and after the filler 40 is cured, the fixing plate 50 is fixed to the rear end portion of the core material 10b.

  Even with such a method, the shear reinforcement structure 100 can be attached to the box culvert 1 and the box culvert 1 can be reinforced.

The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 6A and 6B, a core material 60b, which is a steel material having one end fixed to the tip base 60a, and a pair of fixing members pivotally supported by the tip base 60a. A reinforcing member 60 having 60c and a spring member 60d spanned between the pair of fixing members 60c may be used.

And as shown to Fig.6 (a), this reinforcement member 60 is inserted in the insertion hole 2, and the front-end | tip base 10a is pushed toward the water stop body 6g.
At this time, the pair of fixing members 60c are in contact with the inner wall of the insertion hole 2 and are narrowed toward the core member 60b, and the spring member 60d is contracted.

Next, as shown in FIG. 6B, when the pair of fixing members 60c passes through the insertion hole 2 and reaches a position penetrating the box culvert 1, the pair of fixing members 60c urged by the spring member 60d. Expands and deforms larger than the outer diameter of the insertion hole 2.
After fixing the pair of fixing bodies 60c thus expanded to the outer surface of the box culvert 1, the insertion hole 2 is filled with the filler 40, the filler 40 is cured, and then fixed to the rear end of the core member 60b. The plate 50 is fixed.

  Even with such a method, the shear reinforcement structure 100 can be attached to the box culvert 1 and the box culvert 1 can be reinforced.

  As described above, according to the method for shear reinforcement of a concrete structure according to the present invention, the core members 10b and 60b, which are reinforcing reinforcing bars, are penetrated through the box culvert 1 by construction from the inner side surface of the box culvert 1. The box culvert 1 can be appropriately reinforced by making full use of the strength of the core members 10b and 60b.

  In the above embodiment, the retaining member 10a of the reinforcing member 10 is screwed to the core member 10b. However, the present invention is not limited to this, and the retaining member 10a may be welded or the like. You may provide in the front-end | tip part of the core material 10b by the well-known shaping methods, such as a well-known connection method and forging and casting.

  Moreover, in the above embodiment, although the example of the construction which reinforces the wall body of the box culvert 1 which is an existing concrete structure was given and demonstrated, this invention is not limited to this, A box culvert The present invention can also be applied to reinforcing a floor body or ceiling body of 1 or reinforcing a concrete structure such as an abutment or a pier whose back surface is buried with earth and sand. The present invention can also be applied to reinforcing a concrete storage structure filled with liquid or gas from the outside.

  Moreover, in the above embodiment, although the edge part of the fixing plate 50 and the core material 10b protrudes in the inner surface of the box culvert 1 which is an existing concrete structure, the edge part of the fixing plate 50 and the core material 10b is extended. By performing the construction so as to be embedded in the filler 40, there can be no portion protruding on the inner surface of the box culvert 1.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

1 Box culvert (concrete structure)
DESCRIPTION OF SYMBOLS 2 Insertion hole 2a Excavation hole 2b Through-hole 3 Water stop packer 3a Water stop valve 5 Chemical liquid injection pipe 5a Chemical liquid jet 6 Water stop agent 6g Water stop body 10 Reinforcement member 10a Stopper 10b Core material 10c Bag body 10d Opening 10e Fixing ring 20 Solidified material 30 Fixing body 40 Filler 50 Fixing plate 60 Reinforcement member 60a Tip base 60b Core material 60c Fixing body 60d Spring member 100 Shear reinforcement structure G Ground

Claims (4)

A shear reinforcement method for reinforcing an existing concrete structure,
Forming an insertion hole penetrating from one side of the concrete structure to the opposite side;
A reinforcing member is inserted into the insertion hole, and a fixing member is provided at a position where a part of the reinforcing member penetrates the concrete structure so as to be larger than the diameter on the opposite surface side of the insertion hole. Process,
Filling the insertion hole with a filler;
A method for shear reinforcement of a concrete structure, comprising: The reinforcing member has a pipe-shaped core material and a bag body that is inflatable on the tip side of the core material,
The step of disposing the fixing body includes
The method for shear reinforcement of a concrete structure according to claim 1, further comprising a step of supplying the solidifying material into the bag body through the core material to form the fixing body. The step of forming the insertion hole includes:
Forming a drilling hole that does not penetrate the concrete structure on one side of the concrete structure;
Attaching a water stop packer having a water stop valve to the excavation hole, and forming a through hole leading to the opposite surface side of the concrete structure in the back of the excavation hole by a drilling tool that passes through the water stop valve;
The method for shear reinforcement of a concrete structure according to claim 1 or 2, characterized by comprising:   4. The concrete structure according to claim 3, further comprising a step of injecting a water-stopping agent to the opposite surface side of the concrete structure through the through-hole to form a water-stopper formed by modifying the ground. Shear reinforcement method.

Images