JPH10220032A - Reinforcing method for concrete construction, thereby obtained reinforced structure, and cushion spacer used for above structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of strength by pressing a cushion spacer against the wall face of a concrete structure, and after reinforcing plates are oppositely provided on the concrete structure and severally fixed with an anchor, filling up a grout agent in a space between them, and also filling up the grout agent in an inside space enclosed with the cushion spacer. SOLUTION: Steel plates 1 having each cushion spacer 10 attached on the periphery of an anchor attaching hole 2 are provided on a wall face 3 and temporarily fixed there. In this state, an anchor 6 is driven in a prepared hole 4 drilled in the wall face 3 to fix the steel plate 1. The grout agent 8 is filled up in a space between the wall face 3 and the steel plate 1 and hardened to unify the wall face 3 and the steel plate 1 for reinforcing the concrete structure. Since the grout agent 8 permeates to an inside space or melts to get out of shape or disappear, the grout agent is filled up to the inside space enclosed with the cushion spacer 10, and a cavity can therefore not remain. Thus the looseness of the anchor bolt and the lowering of strength due to the residual cavity are not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a concrete structure, a reinforcing structure obtained by the method, and a cushion spacer used for the method.

[0002]

2. Description of the Related Art Existing concrete structures such as bridge piers, high-rise buildings, revetment concrete walls, and columns of underground spaces may be cracked due to aging or disasters, and repair work may be required. In addition, reinforcement work may be required due to review of safety standards. In these works (hereinafter referred to as "reinforcement work"), usually, a steel plate serving as a reinforcing plate is arranged at a predetermined interval on the outside of an existing wall surface, and a grout agent is filled in the gap and the steel plate is filled. It has been reinforced by incorporating it.

[0003] The procedure of the above reinforcing work will be described in more detail. That is, first, a steel plate 1 (see FIG. 1) used for reinforcement is prepared at a factory. The steel sheet 1 is cut into a predetermined shape, bent if necessary, and subjected to a surface treatment such as shot blasting and a primer coating treatment in order to enhance the adhesiveness with the grouting agent. Then, holes 2 (in this example, countersunk holes) for attaching anchors to be described later are formed at predetermined intervals. Also, in most cases, it is necessary to weld and connect a plurality of steel plates 1 at a construction site, so that an edge to be welded is beveled.

[0004] The steel sheet 1 prepared in this way is shown in FIG.
As shown in FIG. 5 (a), the concrete structure is required to be reinforced and installed on the wall surface 3 of the concrete structure so as to keep a predetermined interval, and is temporarily fixed by temporary fixing anchor bolts (not shown). And
As shown in FIG. 15 (b), using a hole 2 for attaching an anchor of the steel plate 1, a pilot hole 4 for driving an anchor is formed in a wall surface 3 using a drill or the like. As shown in FIG. 16 (a), concrete dust 5 generated at the time of drilling is scattered in and around the pilot hole 4, and this was blown off with a blower or removed by suction with a dust collector. Later
As shown in FIG. 16 (b), the steel plate 1 is fixed by driving the anchor 6 and tightening the countersunk bolt 7 from the front side of the steel plate 1 into the internal thread portion 6a. Then, the temporary anchor bolt is removed, and the hole is sealed (not shown).

In this state, the gap between the wall surface 3 and the steel plate 1 is filled with a grouting agent 8 such as an epoxy resin and cured. This state is shown in FIG. Thereby, the wall surface 3 and the steel plate 1 are integrated, and the concrete structure is reinforced.

[0006]

In such a reinforcement work, when drilling the anchor pilot hole 4 (see FIG. 16 (a)).
Concrete dust 5 generated in the grouting agent 8 and the wall 3
In addition, this causes a reduction in the adhesive strength between the steel plates 1 and causes a problem. That is, the concrete dust 5 that has fallen into the gap between the wall surface 3 and the steel plate 1 adheres and remains on the wall surface 3 and the back surface of the steel plate 1 and cannot be completely removed even by using a blower or a dust collector. When the grouting agent 8 is filled in this state, the adhesive force between the grouting agent 8 and the wall surface 3 and between the grouting agent 8 and the steel plate 1 are greatly reduced,
Reinforcement strength tends to be insufficient. Moreover, since the concrete dust 5 easily accumulates in a welded portion (a portion where the steel plate 1 and the steel plate 1 are connected by welding) projecting from the back surface of the steel plate 1, the grout agent 8 and the steel plate 1
The adhesive strength with the part becomes particularly insufficient,
There is a risk of breaking.

Therefore, the present applicant has developed a reinforcing method using a special cushion spacer, which prevents concrete dust generated during drilling of a prepared hole in an anchor from adhering to a wall surface or a surface to which a steel plate is bonded. An application has been filed (Japanese Patent Application No. 8-310275, filed on November 21, 1996). Prior to drilling the pilot hole in the anchor, for example, FIG.
As shown in (b), a ring-shaped cushion spacer 100 is mounted around the anchor mounting hole 2 of the steel plate 1. When the pilot hole 4 is drilled in this state, concrete dust generated is generated. 5 is only scattered in the pilot hole 4 and the space surrounded by the cushion spacer 100, so that it can be easily removed by blowing it out from the front side with a blower or the like, and the wall surface 3 and the adhesive surface of the steel plate 1 can be stained. There is no.

However, the above cushion spacer 1
When the grout agent 8 is used when filling the grout agent 8 (FIG. 17)
[A]), it was found that the grout agent 8 was difficult to penetrate into the inner space surrounded by the cushion spacer 100, so that the periphery of the anchor 6 could remain hollow. The presence of such a cavity may cause the countersunk bolt 7 to be loosened, reduce the bonding area at this portion, and may result in insufficient strength. Therefore, improvement is strongly desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and when dust is reinforced at an existing concrete structure such as a bridge pier, a high-rise building, a concrete wall for revetment, a support of an underground space, concrete dust is generated on the concrete wall or the concrete wall. An excellent method of reinforcing a concrete structure and a reinforcing structure obtained by the method, which do not adhere to the surface to which the reinforcing steel sheet is bonded, and do not cause a decrease in strength due to sufficient filling of grout around the anchor. It is another object of the present invention to provide a cushion spacer used for the same.

[0010]

In order to achieve the above object, the present invention provides a concrete structure having a reinforcing plate having an anchor mounting hole formed on a wall thereof, and a reinforcing plate having a predetermined distance H with respect to the concrete structure wall. It is a reinforcing method in which the reinforcing plate is fixed with an anchor in that state, a grout agent is filled in a gap between the wall surface and the reinforcing plate, and the reinforcing plate and the wall surface are integrated, As the reinforcing plate, a cushion spacer A described below was joined around the anchor mounting hole with its anchor insertion hole aligned with the anchor mounting hole of the reinforcing plate. With the cushion plate A pressed against the wall surface of the concrete structure, the reinforcing plate is fixed to the concrete structure with an anchor, and then filled with a grout agent.
A first gist is a method for reinforcing a concrete structure in which a grout agent is also filled in an inner space surrounded by the cushion spacer A. (A) A plate-shaped elastic body having a hole for inserting an anchor and having a thickness dimension K larger than the interval H, wherein the elastic body is
Cushion spacers made of a material that does not prevent grout agent from entering the holes for anchor insertion.

Further, the present invention provides a reinforcing plate having a hole for anchor attachment formed on a wall surface of a concrete structure so as to keep a predetermined distance H 'from the wall surface of the concrete structure. Fixing the reinforcing plate with an anchor, filling the gap between the wall surface and the reinforcing plate with a grout agent to integrate the reinforcing plate and the wall surface, and as the reinforcing plate, the anchor mounting hole Around the periphery, a rigid cylindrical portion of the cushion spacer B described below was joined in a state where its hollow portion was aligned with a hole for attaching an anchor of the reinforcing plate, and an elastic portion of the cushion spacer B was connected to a concrete structure. After the reinforcing plate is fixed to the concrete structure with the anchor in a state of being pressed against the wall surface, the grouting agent is filled, and the inner space surrounded by the cushion spacer B is filled. The reinforcing method of the concrete structure so as to fill the grout agent and second aspect. (B) A rigid tubular portion having an axial thickness dimension L smaller than the interval H 'and provided with an in-cylinder communication means capable of forming a grout agent intrusion path when the grout agent is filled, and a hole for anchor insertion. An elastic portion made of a plate-like elastic body having a thickness dimension M larger than a difference (H'-L) between the interval H 'and the axial thickness dimension L of the rigid cylinder section; The elastic portion is joined to one end of the cushion spacer with its anchor insertion hole aligned with the hollow portion of the rigid tubular portion, and the axial thickness N of the entire cushion spacer is larger than the interval H '. The set cushion spacer.

Further, according to the present invention, a reinforcing plate having an anchor mounting hole formed in a wall surface of a concrete structure is provided.
It is fixed by an anchor while being opposed to the concrete structure wall surface at a predetermined interval, and a grout agent is filled in a gap between the wall surface and the reinforcing plate, and the reinforcing plate and the wall surface are integrated. In a reinforcing structure, a periphery of an anchor for fixing the reinforcing plate and the concrete structure is surrounded by the cushion spacer A or B, and a grout agent is also provided in an inner space surrounded by the cushion spacer A or B. A third aspect is a reinforcing structure of a concrete structure characterized by being filled.

[0013] Further, the present invention provides a concrete structure in which a reinforcing plate having an anchor mounting hole formed on a wall surface thereof is fixed to the concrete structure wall surface by an anchor while maintaining a predetermined distance H therebetween. A cushion spacer used for a reinforcing structure in which a grout agent is filled in a gap between the wall surface and the reinforcing plate and the reinforcing plate and the wall surface are integrated, and has a hole for inserting an anchor, and has a thickness dimension K A fourth aspect of the present invention is a concrete structure comprising a cushion spacer made of a plate-like elastic body larger than the above-mentioned interval H, wherein the elastic body is formed of a material which does not prevent the grout agent from entering the anchor insertion hole. A reinforcing plate having an anchor mounting hole formed on the wall surface of the concrete structure is attached to the anchor in a state where the reinforcing plate is opposed to the concrete structure wall surface at a predetermined distance H ′. And a gap between the wall surface and the reinforcing plate is filled with a grout agent to be used in a reinforcing structure in which the reinforcing plate and the wall surface are integrated with each other. A rigid cylindrical portion provided with in-cylinder communication means which is smaller than H 'and is capable of forming a grout intrusion path when the grout is charged, and a hole for inserting an anchor; An elastic portion made of a plate-like elastic body larger than a difference (H'-L) from the thickness L in the axial direction of the cylindrical portion, and the elastic portion is attached to one end of the rigid cylindrical portion by an anchor. The cushion spacer in which the hole for insertion is joined to the hollow portion of the rigid cylindrical portion and the thickness N in the axial direction of the entire cushion spacer is set to be larger than the above-mentioned interval H 'is referred to as a fifth gist. I do.

[0014]

Next, an embodiment of the present invention will be described.

In the present invention, the reinforcement of the concrete structure is performed, for example, as follows. That is, first, the steel plate 1 is prepared in the factory. The preparation of the steel sheet 1 is the same as that of the conventional steel sheet. The steel sheet 1 is bent as required, and a surface treatment such as shot blasting and a primer coating treatment are performed. Then, as shown in FIG. 1, holes 2 for anchor attachment are drilled at predetermined intervals.

On the other hand, a cushion spacer to be mounted around the anchor mounting hole 2 is prepared. The use of the cushion spacer is a major feature of the present invention. The cushion spacer 10 is made of an elastic material. For example, as shown in FIG. 2A, the cushion spacer 10 has a ring shape, and a hole 11 formed at the center is aligned with the anchor mounting hole 2 of the steel plate 1. 1 is attached and fixed to the mounting surface (rear surface) (shown by a chain line in FIG. 1).

The thickness dimension K of the cushion spacer 10 is set to be slightly larger than the gap H (see FIG. 3) provided between the wall surface 3 and the steel plate 1 in this reinforcing work. When the grout is a resin grout such as an epoxy resin, the interval H is usually set to about 4 to 10 mm. On the other hand, how much the thickness K of the cushion spacer 10 is increased depends on the cushion spacer 1.
It is appropriately set in consideration of the elasticity of 0, etc.
Is set to about 2 to 10 times H. That is, the wall 3
The thickness K of the cushion spacer 10 is made larger than the gap H between the cushion spacer 10 and the steel plate 1 so that even if the wall surface 3 or the steel plate 1 has some distortion or irregularities, the cushion spacer 1
0 is slightly compressed between the wall surface 3 and the steel plate 1 and the cushion spacer 10 is deformed along the above-mentioned distortion and unevenness, so that between the cushion spacer 10 and the wall surface 3 and between the cushion spacer 10 and the steel plate 1 There is no gap between them. In particular, when the concrete structure is a pier or a support of an underground space, and the surroundings are reinforced with a steel plate 1, the steel plate 1 is used by welding. Due to the above characteristics, it can be attached without gaps. Further, even when the wall 3 of the concrete structure is curved or folded in an arc shape, the cushion spacer 10 is deformed along the curved surface and is slightly compressed, so that the Can be mounted without gaps.

The cushion spacer 10 is
When the grout is filled with the grout fixed, it is necessary to set the grout into the space P (see FIG. 3) inside the hole 11 formed at the center. The first for that
As a proposal, it is conceivable that the cushion spacer 10 is formed of a porous body having relatively large continuous pores through which a grout agent can penetrate. Commercial products of such a continuous porous material include Aaron special form QW type (manufactured by Achilles) and INOAC malt filter MF.
13, MF20, MF30 (manufactured by Inoue Rubber Co., Ltd.) and the like. If the surface of the porous body (including the surface of continuous pores) is subjected to a surface treatment for enhancing the affinity with the grouting agent, the grouting agent is smoothly permeated, which is more preferable. When the grout is a resin grout such as an epoxy resin, a resin of the same type as the grout and having a low molecular weight is used as such a surface treatment agent. When the grouting agent is an aqueous liquid such as a non-shrinkable mortar, it is preferable to use a surfactant that improves the wettability of the surface of the porous body.

Further, as a second solution for allowing the grout agent to enter the inner space P of the cushion spacer 10, it is conceivable to form the cushion spacer 10 from a material which can be dissolved or lost or lost by dissolving in the grout agent. As such a material, when the grouting agent is a resin grout such as an epoxy resin, it is preferable to use a resin (for example, a styrene-based resin) that is dissolved by a solvent used for the grouting agent. When the grouting agent is an aqueous liquid such as a non-shrinkable mortar, a water-soluble polymer such as polyvinyl alcohol or polyethylene oxide is preferred. Further, water-soluble Japanese paper, starch, dextrin or the like having elasticity may be used.

Since the cushion spacer 10 may be heated by welding or the like during construction on site,
It is preferable that the material can withstand a high temperature of 120 ° C to 160 ° C.

The cushion spacer 10 is designed so that it can be easily attached to the steel plate 1.
It is preferable to use one having a form in which an adhesive layer is formed on one surface and a release paper 14 is adhered thereon (see FIG. 2A). Such a cushion spacer 10 can be easily obtained, for example, by stamping and forming a sheet-like laminated product (commercially available product) shown in FIG. 2B into a ring shape. This laminate is provided with an adhesive layer 13 on one side of the elastic layer 12.
Is formed, and a release paper 14 is adhered thereon. When such a commercially available product is not available, it is preferable that an appropriate double-sided adhesive sheet (with a release paper 14) be attached to a sheet-like elastic body.

The bonding and fixing of the cushion spacer 10 to the steel plate 1 may be performed in a factory as an extension of the preparation of the steel plate 1, or may be performed directly at the construction site.

In this manner, the steel plate 1 with the cushion spacer 10 attached around the anchor attachment hole 2
In the same manner as in the prior art, facing the outside of the wall surface 3 of the concrete structure while maintaining a predetermined interval H, and temporarily fixing (FIG. 3). At this time, the tip end (the end not bonded and fixed to the steel plate 1) of the cushion spacer 10 is pressed against the wall surface 3 by its elasticity.

In this state, as shown in FIG. 4, a pilot hole 4 for driving an anchor is drilled in the wall surface 3 using a hammer drill 15. At this time, as in the conventional case, concrete dust 5 is generated, but these are only scattered in the pilot hole 4 and the inner space P surrounded by the cushion spacer 10 as shown in FIG. It can be easily removed, for example, by blowing out from the front side of the hole 2 of the steel plate 1 with a blower or removing by suction. Therefore, unlike the conventional case, it does not fall into the gap between the wall surface 3 and the steel plate 1 and remains.
The adhesive surface of the wall surface 3 and the steel plate 1 is not contaminated by the concrete dust 5.

Then, as shown in FIG. 5B, an anchor 6 is driven into the prepared hole 4 from which the concrete dust 5 has been removed, and a countersunk bolt 7 is screwed into the internal thread 6a from the front side of the steel plate 1. Thereby, the steel plate 1 is fixed. And
As in the prior art, after temporarily removing the steel plate 1 and sealing the through holes, the gap between the wall surface 3 and the steel plate 1 is filled with a grout agent 8 such as an epoxy resin as shown in FIG. The concrete structure can be reinforced by integrating the wall surface 3 and the steel plate 1. As described above, the cushion spacer 10 is made of a material having continuous pores through which the grout agent 8 can penetrate into the inner space P, or it is dissolved in the grout agent 8 and collapses or disappears. The grout agent 8 is filled up to the inner space P surrounded by 10 and no void remains.

As described above, according to the above method, the concrete dust 5 generated at the time of drilling is removed from the cushion spacer 10.
In the reinforcing structure obtained by filling the grout agent 8 into the gap and hardening the grout agent 8, since the gap between the wall surface 3 and the steel plate 1 does not contaminate the surfaces of the both sides due to the presence of
There is no decrease in the bonding strength at the bonding interface due to the presence of the concrete dust 5. Moreover, when the grouting agent 8 is filled, the grouting agent 8 does not fill up to the inner space P surrounded by the cushion spacer 10 and a cavity does not remain around the anchor driving portion. There is no decrease in adhesive strength. Therefore, a high-strength reinforcing structure can be obtained.

In order to fix the steel plate 1 to the wall surface 3 of the concrete structure while maintaining a predetermined distance H, usually, as shown in FIG. Around the hole 2 for anchor attachment,
A plurality of magnet spacers 16 having the same thickness as the above are mounted. That is, the spacer 1
This is because, by interposing the steel plate 6, when the steel plate 1 is fixed, the countersunk bolt 7 (see FIG. 5B) can be prevented from being excessively tightened and the interval H can be prevented from becoming too narrow. Therefore, as shown in FIG. 7B, a magnet piece 17 corresponding to the spacer 16 is provided on the cushion spacer 10 of the present invention.
When the cushion spacer 10 is held between the wall surface 3 and the steel plate 1, the thickness of the magnet small piece 17 is changed to the wall thickness 3 when the cushion spacer 10 is sandwiched between the wall surface 3 and the steel plate 1. Since the interval between the steel plates 1 can be regulated to the interval H, it is not necessary to separately attach the spacer 16, which is preferable. Moreover, the conventional spacer 16
Has been appropriately mounted around the anchor mounting hole 2 in the unit of an interval. However, since the magnet pieces 17 are always positioned accurately and evenly in the anchor mounting hole 2, When the magnet 6 is fixed, a force is evenly applied to each of the magnet pieces 17, so that the steel plate 1 is not distorted.

The above-mentioned magnet piece 17 is attached to the cushion spacer 1.
In order to keep it at 0, it is necessary to give the cushion spacer 10 an area to some extent. FIG. 8 shows such an example.
(A) and FIG. The cushion spacer 10 ′ shown in FIG. 8A has a square planar shape, and has two small holes 18 formed diagonally across the anchor insertion hole 11. Of the magnet pieces 17 are fitted. The cushion spacer 10 ″ shown in FIG. 8 (b) has a planar shape of a triangular shape in which each top is cut flat, and three small holes 18 are formed around the anchor insertion hole 11 at equal intervals. A disc-shaped magnet piece 17 is fitted in each small hole 18.

Note that these cushion spacers 1
0 ', 10 "can be obtained simply and economically from the above-mentioned sheet-like laminate (see FIG. 2 (b)) cut into a strip shape. Incidentally, the cushion spacer shown in FIG. 9, as shown in FIG. 9, can be easily obtained by punching a band-shaped sheet-like laminated product 20 and fitting the small magnet pieces 17 into the small holes 18.

In the present invention, when the gap between the wall 3 of the concrete structure and the steel plate 1 is relatively wide (for example, when the grout is a non-shrink mortar or the like, the gap is about 30 to 50 mm). Is set to)
For example, as shown in FIG. 10, it is preferable to use a cushion spacer 23 in which a rigid cylindrical portion 21 and an elastic portion 22 made of a plate-like elastic body are combined.

The rigid cylindrical portion 2 of the cushion spacer 23
1 is made of, for example, a cylindrical or rectangular cylinder made of metal or engineering plastic, and has a thickness L in the axial direction, which is a gap H 'between the wall surface 3 and the steel plate 1 (FIG. 1).
1) is set slightly smaller. As shown in FIGS. 12 (a) and 12 (b), four notched holes 24 for communication between the inside and outside of the cylinder are formed in the circumferential wall 21a in the circumferential direction at an equal size. The elastic portion 22 (return to FIG. 10) is formed of a member made of a plate-like elastic body,
Like the cushion spacer 10, it has a hole 25 for inserting an anchor. And the thickness dimension M of the elastic part 22
Is set to be larger than the difference (H′−L) between the interval H ′ and the axial thickness L of the rigid cylindrical portion 21. Thereby, similar to the case of the cushion spacer 10,
Even if the wall surface 3 and the steel plate 1 have some distortions and irregularities, the elastic portion 22 is necessarily interposed between the wall surface 3 and the steel plate 1 with a slight compression, and the cushion spacer 23 and the wall surface 3 There is no gap.

Further, the outer periphery of the rigid cylindrical portion 21 is covered with a cylindrical sealing material 26 made of a material which dissolves in a grout and collapses or disappears. That is, the sealing material 26 prevents the scattering of concrete dust generated when drilling a hole under the anchor, and dissolves in the grout to expose the notch 24 when the grout is filled. The agent can be filled in the inner space P ′ (see FIG. 11) of the rigid cylindrical portion 21.

As the material of the sealing material 26, the same material as that used when the cushion spacer 10 can be dissolved in a grout agent is used. The sealing material 26 does not necessarily need to be formed into a cylindrical shape as shown in FIG. 10. For example, the sealing material 26 may be formed by winding a band-shaped sheet around the rigid cylindrical portion 21 and bonding the ends. . Further, it is not always necessary to cover the entire outer periphery of the rigid cylindrical portion 21, and it is sufficient that the notch hole 24 is covered. Further, the seal member 26 may be attached to the inside of the rigid tubular portion 21.

The plate-like elastic body used for the elastic portion 22 may be a material which allows the grout agent to permeate or dissolves in the grout agent, similarly to the cushion spacer 10. However, it may be a simple elastic body.

The elastic portion 22 is bonded and fixed to one end of the rigid cylindrical portion 21 with the anchor insertion hole 25 aligned with the hollow portion of the rigid cylindrical portion 21. Is set to be larger than the interval H ′.

The cushion spacer 23 is used to reinforce a concrete structure in the same manner as the cushion spacer 10 described above. When the cushion spacer 23 is attached to the steel plate 1, the end face of the rigid tubular portion 21 is attached to the anchor of the steel plate 1. A joining means such as welding or brazing is used in a state of being fitted to the mounting hole 2. Alternatively, a double-sided adhesive tape (with release paper) is attached to the end surface of the rigid tubular portion 21 in advance,
There is no problem if the release paper is peeled off and adhered to the steel plate 1. However, in this case, the double-sided adhesive tape must have a strong adhesive force capable of joining metals.

Then, the steel plate 1 is opposed to the wall surface 3 so that the elastic portion 22 is pressed against the wall surface 3 of the concrete structure, and the state shown in FIG. 11 is obtained. And, below,
Reinforcement work is performed in the same manner as described above. This cushion spacer 23 can also prevent the contamination of the wall surface 3 and the steel plate 1 by the concrete dust 5 (see FIG. 5A), and can also fill the inner space P 'of the cushion spacer 23 with the grout agent. Because you can
A very strong reinforcing structure can be obtained.

The form of the cushion spacer 23 is not limited to the above example. That is, at the time of drilling a pilot hole, the rigid cylindrical portion 21 and the elastic portion 22 completely block the inside space P 'from the outside, and when the grout is filled, the inside and outside of the rigid cylindrical portion 21 communicate with each other. It does not matter if it is in any form. For example, as shown in FIGS. 13 (a) and 13 (b), a rigid cylindrical portion 21 is used in which three ribs 27 are formed by notching the peripheral wall of a cylindrical body at three places. A combination of the same elastic portion 22 and seal material 26 as described above can be used.

As shown in FIGS. 14 (a) and 14 (b), the rigid cylindrical portion 21 has a ring-shaped body 2 at both ends.
8, between the opposed ring-shaped bodies 28,
A structure in which a rib 29 composed of three round bars is bridged is used, and a combination of the elastic portion 22 and the sealing material 26 similar to the above can be used.

Further, the entire rigid cylindrical portion 21 may be formed of a material which dissolves in a grout and collapses or disappears. In this case, the notch 24 or the like and the sealing material 26 as described above are not necessary, and it is sufficient to form them into a cylindrical shape.

In the present invention, the type of reinforcement work,
The object is not particularly limited, and a reinforcing plate such as a steel plate, a PC plate, or an FRP plate is opposed to a wall surface at a predetermined interval, fixed with an anchor, and the gap is filled with a grout agent and cured to be integrated. Any construction method can be used. For example, reinforcement work such as surrounding a pier or a pillar in an underground space with a plurality of reinforcing plates connected together, or reinforcing work on the wall of a concrete structure that is curved or folded in an arc shape , Can be applied effectively. The type of anchor and the method of fixing the anchor are not particularly limited.

In the present invention, each of the cushion spacers 10, 10 ', 10 "may be completely separated by punching or the like, for example, a strip-shaped sheet, or a strip-shaped sheet. In a factory or a construction site, a large sheet that is held in a state where a large number of sheets are stuck on the release paper 14 as a base may be adhered to the steel sheet 1 or the like on the spot while peeling off the base. No problem.

Further, when the cushion spacer 23 is used, only the rigid tubular portion 21 is previously joined to the steel plate 1 or the like, and thereafter, a single strip-shaped sheet or a large number of wider sheets are attached to the end surface of the rigid tubular portion 21. The elastic portion 22 stuck and held individually may be adhered while being sequentially peeled off in the same manner as described above.

[0044]

As described above, according to the present invention, a bridge pier, a high-rise building, a concrete wall for revetment, a support for an underground space, etc.
In the reinforcement work of an existing concrete structure, scattering of concrete dust generated at the time of drilling is limited to a minimum space surrounded by the cushion spacer, and thus can be easily removed. Therefore, the concrete dust does not fall into the gap between the wall surface and the reinforcing plate and contaminates both surfaces, thereby reducing the adhesive strength of the bonding interface between the wall surface and the reinforcing plate. This has the advantage that a reinforcing structure can be obtained. In addition, when the grouting agent is filled, the grouting agent fills the inner space surrounded by the cushion spacer and does not form a cavity around the anchor driving portion, so that the anchor bolt may be loosened and the strength may be reduced due to the remaining cavity. It has the advantage of not being. And since the cushion spacer of the present invention can be mass-produced at low cost, it is most suitable for realizing the reinforcing structure of the present invention.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a steel sheet used in one embodiment of the present invention.

FIG. 2 (a) is an explanatory view of a cushion spacer used in the above embodiment, and FIG. 2 (b) is an explanatory view of a sheet-like laminated product as a material thereof.

FIG. 3 is an explanatory view of a construction procedure of the embodiment.

FIG. 4 is an explanatory diagram of a construction procedure of the embodiment.

FIGS. 5 (a) and 5 (b) are explanatory diagrams of a construction procedure of the embodiment.

FIG. 6 is an explanatory diagram of a construction procedure of the embodiment.

FIG. 7A is an explanatory view of a state in which a spacer is attached to a steel plate, and FIG. 7B is an explanatory view of a modification of the cushion spacer of the present invention.

FIGS. 8A and 8B are explanatory views of a modified example of the cushion spacer. FIG.

FIG. 9 is an explanatory view of a manufacturing method of a modified example of the cushion spacer.

FIG. 10 is an explanatory view of a cushion spacer used in another embodiment of the present invention.

FIG. 11 is an explanatory diagram of a construction procedure according to another embodiment.

FIG. 12 (a) is an explanatory view of a rigid tubular portion in a cushion spacer used in the other embodiment, and FIG. 12 (b) is a right side view thereof.

FIG. 13A is an explanatory view of a modified example of the cushion spacer used in the other embodiment, and FIG. 13B is a right side view thereof.

FIG. 14A is an explanatory view of another modification of the cushion spacer used in the other embodiment, and FIG. 14B is a right side view thereof.

FIGS. 15A and 15B are explanatory diagrams of a conventional method of reinforcing a concrete structure.

16 (a) and (b) are explanatory views of a conventional method for reinforcing a concrete structure.

FIG. 17 (a) is an explanatory diagram of a conventional method of reinforcing a concrete structure, and FIG. 17 (b) is an explanatory diagram of a method of reinforcing an improved concrete structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Anchor attachment hole 3 Wall surface 6 Anchor 8 Grout agent 10 Cushion spacer P Inner space

Claims (10)

[Claims] 1. A reinforcing plate having a hole for anchor attachment formed on a wall surface of a concrete structure so as to maintain a predetermined distance H from the wall surface of the concrete structure. Fixing with an anchor, a reinforcing method of integrating the reinforcing plate and the wall surface by filling a grout agent into the gap between the wall surface and the reinforcing plate, as the reinforcing plate, around the anchor mounting hole, the following A cushion spacer A was prepared in which the holes for anchor insertion were aligned with the holes for attaching the anchors of the reinforcing plate, and the cushion spacer A was pressed against the wall surface of the concrete structure. Is fixed to the concrete structure with an anchor, and then filled with grout,
A method for reinforcing a concrete structure, characterized in that a grout agent is also filled in an inner space surrounded by the cushion spacer (A). (A) A plate-shaped elastic body having a hole for inserting an anchor and having a thickness dimension K larger than the interval H, wherein the elastic body is
Cushion spacers made of a material that does not prevent grout agent from entering the holes for anchor insertion. 2. A reinforcing plate having an anchor mounting hole formed on a wall surface of a concrete structure so as to keep a predetermined distance H 'from the wall surface of the concrete structure. Is fixed by an anchor, a reinforcing method of integrating the reinforcing plate and the wall surface by filling the grout agent into the gap between the wall surface and the reinforcing plate, as the reinforcing plate, around the anchor mounting hole, the following A rigid tubular portion of the cushion spacer B is joined with its hollow portion aligned with the anchor mounting hole of the reinforcing plate, and the elastic portion of the cushion spacer B is pressed against the wall of the concrete structure. In this state, the reinforcing plate is fixed to the concrete structure with the anchor, and then filled with grouting agent, and the inside space surrounded by the cushion spacer B is also filled with grouting agent. A method for reinforcing a concrete structure, characterized in that it is filled. (B) A rigid tubular portion having an axial thickness dimension L smaller than the interval H 'and provided with an in-cylinder communication means capable of forming a grout agent intrusion path when the grout agent is filled, and a hole for anchor insertion. An elastic portion made of a plate-like elastic body having a thickness dimension M larger than a difference (H'-L) between the interval H 'and the axial thickness dimension L of the rigid cylinder section; The elastic portion is joined to one end of the cushion spacer with its anchor insertion hole aligned with the hollow portion of the rigid tubular portion, and the axial thickness N of the entire cushion spacer is larger than the interval H '. The set cushion spacer. 3. A reinforcing plate having an anchor mounting hole formed on a wall surface of a concrete structure, the reinforcing plate being fixed to the concrete structure wall surface by an anchor in a state where the reinforcing plate is maintained at a predetermined distance from the wall. 2. A reinforcing structure in which a grout agent is filled in a gap between a wall surface and a reinforcing plate and the reinforcing plate and the wall surface are integrated, and a periphery of an anchor for fixing the reinforcing plate and the concrete structure is provided. 3. A reinforcing structure for a concrete structure, characterized by being surrounded by the cushion spacer A or the cushion spacer B according to claim 2, and the inside space surrounded by the cushion spacer A or B is also filled with a grout agent. . 4. A reinforcing plate having an anchor mounting hole formed on a wall surface of a concrete structure and fixed to the wall surface of the concrete structure with an anchor so as to keep a predetermined distance H from the wall surface of the concrete structure. Spacer for use in a reinforcing structure in which a grout agent is filled in a gap between the reinforcing plate and the reinforcing plate, and the reinforcing plate and the wall surface are integrated with each other. A cushion spacer comprising a larger plate-like elastic body, wherein the elastic body is formed of a material that does not prevent the grout agent from entering the anchor insertion hole. 5. The cushion spacer according to claim 4, wherein a magnet piece having a thickness equal to the interval H is attached to at least one portion. 6. The cushion spacer according to claim 4, wherein the elastic body is formed of a porous body having continuous pores that can penetrate a grout agent. 7. The cushion spacer according to claim 4, wherein the elastic body is formed of a material that can be disintegrated or disappear by dissolving in a grouting agent. 8. A reinforcing plate having an anchor mounting hole formed on a wall surface of a concrete structure and fixed by an anchor in a state where the reinforcing plate is opposed to the wall surface of the concrete structure so as to keep a predetermined distance H ′. A cushion spacer used for a reinforcing structure in which a grout agent is filled in a gap between a wall surface and a reinforcing plate and the reinforcing plate and the wall surface are integrated, and a thickness L in an axial direction is smaller than the interval H ′, It has a rigid cylindrical portion provided with in-cylinder communication means capable of forming a grout agent intrusion path at the time of grout agent filling, and a hole for anchor insertion, and has a thickness dimension M of the above-mentioned interval H 'and the axial direction of the rigid cylindrical portion. An elastic portion made of a plate-like elastic body larger than the difference (H'-L) from the thickness dimension L, and the elastic portion rigidly inserts an anchor insertion hole at one end of the rigid cylindrical portion. Fit the hollow part of the cylinder The cushion spacer, wherein the thickness N in the axial direction of the entire cushion spacer is set to be larger than the interval H '. 9. A notch for communication between the inside and the outside of the cylinder is formed on a peripheral wall of the rigid cylinder, and the notch is covered with a sealing material made of a material that can be disintegrated or lost by dissolving in a grout agent. 9. The cushion spacer according to claim 8, wherein the cushion spacer is provided. 10. The cushion spacer according to claim 8, wherein the entire rigid cylindrical portion is formed of a material which can be dissolved or lost or dissolved in a grout agent.