JPH0972098A - Concrete mass reinforcing method and anchor pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the effect of reinforcing a concrete mass to which a carbon fiber sheet, etc., is affixed, by preventing exfoliation of the reinforcing material; to reinforce a concrete mass to which no sheet, etc. is affixed, simply at a low cost without use of any particular reinforcing material. SOLUTION: The reinforcing method concerned applies to a concrete mass to whose surface a reinforcing material 25 such as a sheet or steel plate is affixed, wherein holes 27 are bored in the concrete mass 26 from above the reinforcing material 25 at a specified spacing, and at least at the tail an opening 2 is provided, and a penetrating hollow part 1a in communication with this opening 2 is formed. An anchor pin in a pipe form is equipped at the peripheral wall with holes 10 in communication with the hollow part 1a, and the body 1 of this anchor pin is fitted in the hole 27 from the foremost part 1b, and fixation to the concrete mass 26 is generated by spreading the foremost part 1b of the pin body 1 with the aid of a spreading tool 29.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to bridges, tunnels,
The present invention relates to the reinforcement of concrete structures such as buildings.

[0002]

2. Description of the Related Art In general, a concrete structure is composed of reinforcing bars arranged in a grid, providing a formwork, casting concrete, constructing a concrete frame, and decorating with a paint or tiles as necessary. Or arrange them. Of course, such a concrete skeleton is designed and constructed so that it can sufficiently bear the load from the beginning, but there are cases in which a load far exceeding expectations is applied. In addition, the structure naturally deteriorates with age, and for example, the skeleton deteriorates due to cracks, corrosion of reinforcing steel due to water leakage, and the like.

Therefore, a reinforcing material such as a sheet material made of carbon fiber, glass fiber, synthetic resin, metal mesh or the like or a steel plate such as a thin iron plate is adhered to the surface of the concrete frame with an adhesive to reinforce the concrete frame. Means (hereinafter, referred to as an adhesion reinforcing method) are used. As one example of such a bonding reinforcement method, the surface of an existing concrete skeleton is polished, a cured resin is applied to secure the bonding strength, and a carbon fiber sheet is bonded as a reinforcing material from above by applying a hardening resin thereon. Then, there is a method in which a resin is further impregnated thereon. According to such a method, there is an advantage that the rigidity of the concrete skeleton is increased because the reinforcing material and the concrete skeleton are integrated, and cracks and the like due to a load are less likely to occur.

[0004]

However, in the above-mentioned method for adhering and reinforcing a concrete frame, the bonding surface is peeled off by the moisture generated from the concrete and the reinforcing material is lifted up, and the integrity of the concrete frame and the reinforcing material is lost. There was a problem that it would not function sufficiently as reinforcement of the concrete frame.

[0005] Particularly, in the case of a concrete skeleton for constructing a peripheral wall such as a floor slab of a bridge or a tunnel, the above problem is remarkable because a large amount of water is generated not only from the concrete but also from the ground. As a countermeasure against such peeling, a measure of injecting an adhesive into a raised portion is also taken, but it does not solve a fundamental problem at all because the same portion or a different portion is peeled.

On the other hand, the above-mentioned sticking and reinforcing method is composed of many steps as described above, the work is complicated, and the material cost is relatively high. In particular, when a pattern or the like is painted on the surface of the concrete frame, if the sticking reinforcement method is applied, the pattern must be painted again. Therefore, it is clear that it is most preferable if the concrete skeleton can be reinforced without using such a bonding reinforcement method.

The present invention has been made in view of the above-mentioned conventional problems, and in the concrete skeleton subjected to the sticking and reinforcing method, the concrete skeleton is reinforced by preventing peeling of the reinforcing material. On the other hand, in the case of concrete skeletons that do not have the adhesive reinforcement method, the method is used to reinforce the concrete skeleton relatively easily and at low cost without using a reinforcing material, and the construction method. It is an object to provide an anchor pin to be used.

[0008]

Means for Solving the Problems The present invention has been made to solve the above problems, and a means for solving the problems is a method for reinforcing a concrete body,
Drill holes 27 in the concrete frame 26 at predetermined intervals,
Insert the anchor pin body 1 into the hole 27 from the tip 1b side,
The anchor pin body 1 is fixed to the concrete skeleton body 26 by expanding the tip portion 1b of the anchor pin body 1 through an expander 29. By fixing the anchor pin main body 1 to the concrete skeleton 26 at predetermined intervals in this manner, the rigidity of the concrete skeleton increases. That is, the anchor pin body 1
Since the concrete layers constituting the concrete skeleton are sewn by the anchor pin main body 1 by driving, the degree of bending by the load is reduced, and as a result, the rigidity of the concrete skeleton 26 is increased. Further, as described in claim 2, the anchor pin body 1 is formed in a pipe shape having an opening 2 at least at a rear end portion 1c thereof and having a through hollow portion 1a communicating with the opening 2 therein. And the anchor pin body 1
When the hole 10 communicating with the through hollow portion 1a is formed in the peripheral wall of the, the water inside the concrete skeleton 26 can escape to the outside from the hole 10 of the anchor pin body 1.

Further, the means according to claim 3 is a method for reinforcing a concrete body having a reinforcing material 25 such as a sheet material or a steel plate adhered to the surface thereof. Holes 27 are drilled at predetermined intervals, and at least a rear end portion 1c has an opening 2 and a through hollow portion 1a communicating with the opening 2 is formed. The pipe-shaped anchor pin main body 1 having the communicating hole 10 formed therein is fitted into the hole 27 from the distal end 1b side, and the distal end 1b of the anchor pin main body 1 is expanded through the extension tool 29 to thereby reduce the concrete. It is to fix to the frame 26.
The concrete frame 26 to which the reinforcing material 25 is attached in this manner
If the anchor pin main body 1 having the hole 10 communicating with the through hollow portion 1a is fixed to the peripheral wall, not only the rigidity is increased as described above, but also water generated from the inside of the concrete skeleton 26 causes the anchor pin main body to move. It will be diverged from the hole 10 of 1 through the through hole 1a to the outside of the concrete skeleton 26 from the opening 2 of the rear end 1c of the anchor pin body 1. Therefore, it is possible to prevent the reinforcing member 25 from peeling off due to moisture generated from the inside, and it is possible to achieve the effect of reinforcing the concrete skeleton 26 with the reinforcing member 25.

Further, as described in claim 4, after the anchor pin main body 1 is fixed, a pin fitting portion 14 which can be attached to the rear end 1c side of the anchor pin main body 1; The pin fitting portion 14 of the seat body 11 provided with an opening 14a communicating with the opening 2 of the anchor member 11 and a flange 13 contacting the reinforcing member 25 is attached to the rear end 1c of the anchor pin body 1. 13
If the reinforcing member 25 is pressed and fixed in the manner described above, not only the peeling of the reinforcing member due to moisture as described above, but also the peeling of the reinforcing member 25 due to natural deterioration of the adhesive can be prevented.

Further, the means according to claim 6 relates to the anchor pin, wherein at least the rear end 1c is provided with the opening 2.
Further, in the vicinity of the tip end portion 1b of the pipe-shaped anchor pin body 1 having the through hollow portion 1a communicating with the opening portion 2, the protrusion portions 3, ... In the anchor pin in which the notch 6 is provided in the axial direction from the tip portion 1b between the two, a hole 10 communicating with the through hollow portion 1a is formed in the peripheral wall of the anchor pin body 1. Moreover, an opening 14a communicating with the opening 2 of the anchor pin body 1 is formed on the side of the rear end 1c of the anchor pin body 1 and can contact the surface of the concrete frame 26 or the reinforcing material 25. The seat body 11 having the collar portion 13 is provided. The anchor pin can be fixed to the concrete skeleton, and water generated from the inside of the concrete skeleton can be diffused to the outside from the hole 10. Further, even when the reinforcing material 25 is adhered to the concrete skeleton, the flange 13 can prevent the reinforcing material 25 from peeling off from the concrete skeleton. Moreover, as described in claim 7,
If the anchor pin body 1 and the seat body 11 are configured to be detachable by a screw action, after the anchor pin body 1 is fixed to the concrete frame, the seat body 11 is fixed to the anchor pin body 1
When it is screwed on, the surface of the reinforcing member 25 is pressed by the flange portion 13 of the seat body 11. Therefore, the reinforcing material 25 is pressure-bonded to the concrete skeleton, and the reinforcing material 25 is reliably attached to the concrete skeleton.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for reinforcing a concrete frame and an anchor pin used in the method according to the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a pipe-shaped anchor pin main body in which a through-hole 1a is formed by bending a plate material,
Openings 2, 2 communicating with the hollow through-hole 1a are opened at the front end 1b and the rear end 1c. Further, a pair of protrusions 3, 3 are provided near the tip 1b at positions facing the inside of the pipe.

Also, the phase is 90 ° with respect to the projection 3,
In addition, a pair of small holes 5, 5 are formed facing each other at a position near the rear end 1c of the anchor pin body 1, and the small holes 5, 5 are formed.
Cuts 6, 6 are provided from to the tip 1b.

Further, on the outer peripheral wall of the anchor pin main body 1,
A screw portion 8 is screwed from the rear end portion 1c toward the front end portion 1b. Reference numeral 10 denotes oblong holes formed in four places on the peripheral wall of the anchor pin main body 1.

Reference numeral 11 denotes a seat body fixed to the anchor pin main body 1 and having a disc-shaped flange 13.
13 has two circular grooves 12 and 12 formed on one surface 11a, and a cylindrical pin fitting portion 14 protruding from the center of the other surface 11b. Both ends 14a, 14a are open. On the inner peripheral wall of the cylindrical pin fitting portion 14, a pin threaded portion 15 that can be screwed into the thread portion 8 of the anchor pin main body 1 is provided.
Further, a screw portion 16 that is screwed into a cover 18 described later is screwed on the outer peripheral wall of the pin fitting portion 14.

Reference numeral 18 denotes a substantially bowl-shaped covering body which is attached so as to wrap the seat body 11 inside. An opening portion 19 is provided at the bottom of the bowl, and a cylindrical shape communicating with the opening portion 19 is provided. A seat fitting portion 20 is provided so as to protrude inside the cover 18. On the inner peripheral wall of the cylindrical seat body fitting portion 20, a seat body threaded portion 22 that can be screwed to the screw portion 16 of the seat body 11 is screwed.

Using the anchor pin having the above structure,
A method of reinforcing a concrete body to which the adhesive reinforcement method has been applied will be described. First, as shown in FIG. 4, the anchor pin main body 1 is drilled from the top of the reinforcing material 25 to a concrete frame 26 to which a reinforcing material 25 such as a carbon fiber sheet material is adhered by an adhesive such as epoxy resin. A hole 27 having a depth such that the screw portion 8 protrudes to the outer surface side of the concrete frame 26 when the anchor pin main body 1 is fitted is provided.

The anchor pin main body 1 preferably has such a length that when inserted into the hole 27, its tip 1b intersects a reinforcing bar 28 embedded inside the concrete frame 26.
The holes 27 into which the crotch and the anchor pin main body 1 are to be inserted are provided at substantially equal intervals at approximately 16 locations per square meter. The length, thickness, etc., of the concrete frame 26 to be constructed may be changed as appropriate.

Next, the anchor pin main body 1 is fitted into the hole 27, and an extension tool 29 having a pointed tip is inserted from the opening 2 of the rear end 1c, and the rear end of the extension tool 29 is driven into a driving rod ( Strike through (not shown). Anchor pin body by such an extension 29
The protrusions 3, 3 of 1 are pushed and expanded, and the tip 1b side of the anchor pin main body 1 bites into the concrete skeleton 26 and is fixed.

After the anchor pin body 1 is fixed, the seat 11
An adhesive such as epoxy resin is applied to one side 11a of the flange portion 13 of the base member 13 and the threaded portion 15 of the pin fitting portion 14 of the seat body 11 is screwed to the thread portion 8 of the anchor pin main body 1 to strengthen the reinforcing member. 25 on the surface
13 is crimped on one side 11a. At this time, the grooves 12, 12 formed on the one surface 11a serve as an adhesive pool.

Finally, the seat body 11 is covered with the cover body 18 by screwing the seat body threaded part 22 of the seat body fitting part 20 of the cover body 18 to the screw part 16 of the seat body 11.

According to the concrete frame reinforcing method according to the present invention, the water generated from the concrete frame 26 is discharged from the hole 10 formed in the anchor pin main body 1 through the anchor pin main body 1.
It has a function of escaping from the opening 2 of the rear end 1c to the outside of the concrete skeleton through the through hollow portion 1a, that is, diverging as a water outlet. Therefore, the reinforcement by moisture
The bonding surface of the reinforcing member 25 is not separated and does not rise, and the integrity of the concrete skeleton 26 and the reinforcing member 25 is maintained, so that the reinforcement by the reinforcing member 25 can be effectively performed.

Further, since the reinforcing material 25 adhered to the concrete skeleton 26 is pressed against the concrete skeleton 26 by the collar portion 13 of the seat body 11 screwed to the anchor pin body 1, the moisture is not caused. Both have an advantage that peeling of the reinforcing material 25 caused by natural deterioration of the adhesive can be prevented.

The concrete frame 26 is reinforced by providing a large number of anchor pin bodies 1 in a direction substantially perpendicular to the surface of the concrete frame 26. That is, as shown in FIG.
In the case of the concrete frame 26, when the load G is applied, the concrete layers A and B are displaced from each other and the concrete frame is easily bent, but in the concrete frame 26 in which the reinforcing method using the anchor pin according to the present invention is performed. Since the concrete layers C and D are sewn by the anchor pin main body 1 as shown in FIG.
A frictional force acts between the layers, thereby preventing the layers from shifting. Therefore, the rigidity of the concrete skeleton 26 is increased. In particular, it is more effective if the anchor pin main body 1 is fitted and fixed to the position crossing the reinforcing bar inside the concrete frame as described above.

In the above embodiment, the hole 10 of the anchor pin main body 1 has an oblong shape. However, the hole 10 is not necessarily limited to an oblong shape. Other shapes can be formed. Also, the size and number of the holes can be changed as appropriate. The point is that at least one hole 10 should be formed in the peripheral wall of the anchor pin main body 1 in order to release moisture generated from the inside of the concrete frame 26.

In the above embodiment, the cover 18 is attached to the seat body 11. However, the cover 18 is merely a nail concealment and is not always necessary. Of course, the seat body 11 in which the covering body 18 is integrally formed may be used. In addition, it is also possible to use an anchor pin in which the anchor pin main body 1 and the seat body 11 are integrally formed.

Further, in the above embodiment, the flange 13 of the seat body 11 has a disk shape, but is not necessarily limited to a disk shape, and may be a square shape, a hexagon shape, or the like. In particular, if the seat body 11 is formed in a hexagonal shape or the like, when the seat body 11 is fixed to the anchor pin main body 1, it can be tightened with a wrench or the like. There is an advantage that can be.

In the above embodiment, the screw portion 8 of the anchor pin main body 1 is screwed on the outer peripheral wall of the anchor pin main body 1, and the pin threaded portion 15 of the seat body 11 is Although it is screwed on the inner peripheral wall of the pin fitting portion 14, as shown in FIG. 6, the screw portion 8 of the anchor pin main body 1 is provided on the inner peripheral wall,
Further, the pin threaded portion 15 of the seat body 11 may be provided on the outer peripheral wall of the pin fitting portion 14. The use of the anchor pin main body 1 and the seat body 11 has an advantage that the protrusion from the reinforcing member 25 can be extremely reduced.

Further, in the above embodiment, the anchor pin main body 1 and the seat body 11 are fixed to each other by the screw action. However, the fixing is not necessarily limited to the screw action. May be fixed by a combination,
As shown in FIG. 7, a plurality of pin holes 31,... Are formed in the rear end portion 1c side of the anchor pin main body 1, and a plurality of pin holes 32,. The pin fitting portion 14 of the seat body 11 is externally fitted to the rear end portion 1c of the anchor pin main body 1 and the fitting rod 33 is fitted into the pin holes 31 and 32 so that the anchor pin main body 1 and the seat The body 11 may be fixed. The point is that the seat 11 can be connected to the anchor pin body 1 and is provided with the opening 14a for allowing moisture to escape to the outside.

Although the concrete frame reinforcing method in the above embodiment has been described in the case where the concrete frame 26 is subjected to the sticking reinforcement method, the concrete frame reinforcing method according to the present invention is not limited to the sticking reinforcing method. It is not intended only for the concrete skeleton 26 that is subjected to the law, but it is also possible to reinforce the concrete skeleton 26 whose surface is painted with paint etc. or the concrete skeleton 26 that is not cured at all. You can do it. For example, if the anchor pin main body 1 is fixed by providing a hole in the concrete skeleton 26 as in the above embodiment, it has an effect of dispersing moisture generated from inside the concrete skeleton, and the rigidity of the concrete skeleton is increased by the anchor pin main body 1. Increase. Therefore, even in a concrete skeleton which has not been subjected to the bonding reinforcement method, the concrete skeleton can be reinforced.

[0031]

As described above, according to the method for reinforcing a concrete skeleton according to the present invention, the rigidity of the concrete skeleton is increased by fixing the anchor pin main bodies to the concrete skeleton at predetermined intervals. Therefore, the concrete frame is hardly bent by the load applied to the concrete frame, and the durability of the concrete frame can be improved.

When the anchor pin main body is provided with a hole as described in claim 2, the moisture generated from the concrete frame and the ground can be diffused to the outside of the concrete frame through the hole. . Therefore, it is difficult for moisture to accumulate inside the concrete skeleton, and it is possible to prevent deterioration of the concrete skeleton due to corrosion of the buried reinforcing steel.

Further, according to the third aspect of the present invention, when the anchor pin body having a hole communicating with the through hollow portion is fixed to the concrete body to which the reinforcing material is attached,
Since the water generated from the inside of the concrete skeleton is scattered to the outside of the concrete skeleton from the hole of the anchor pin main body, it is possible to prevent the water from accumulating between the reinforcing material and the surface of the concrete skeleton and the reinforcing material from peeling off. Therefore,
The purpose of reinforcing the concrete skeleton by the reinforcing material can be achieved.

According to a fourth aspect of the present invention, after the anchor pin body is fixed, the reinforcing material is pressed and fixed by the flange of the seat body, so that the reinforcing material is crimped to the concrete frame. Accordingly, the peeling of the reinforcing material due to the natural deterioration of the adhesive can be prevented.

In addition, according to the anchor pin of the present invention, it can be fixed to the concrete skeleton and water generated from the inside of the concrete skeleton can be diffused to the outside from the hole. In particular, the reinforcing material is attached to the concrete skeleton. If such is the case, it is possible to prevent peeling of the reinforcing material.

When the anchor pin main body and the seat body are configured to be attachable by a screw action as described in claim 7, the seat body can be easily attached to the anchor pin main body and the seat body can be attached. By tightening, the flange portion of the seat body can press the surface of the reinforcing material. Therefore, the reinforcing material is pressure-bonded to the concrete skeleton, so that the reinforcing material is reliably attached to the concrete skeleton.

[Brief description of drawings]

FIG. 1 is a fragmentary exploded view showing an embodiment of an anchor pin according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a sectional view showing an embodiment of a method for reinforcing a concrete skeleton according to the present invention.

5A and 5B show reference diagrams relating to the rigidity of a concrete skeleton. FIG. 5A shows a conventional concrete skeleton, and FIG. 5B shows a concrete skeleton subjected to the reinforcing method according to the present invention.

FIG. 6 is an exploded main part cutaway view showing another embodiment of the anchor pin according to the present invention.

FIG. 7 is an exploded main part cutaway view showing another embodiment of the anchor pin according to the present invention.

[Explanation of symbols]

1… anchor pin main body, 1a… through hollow part, 1b… tip part,
1c ... rear end, 2 ... opening, 3 ... projection, 6 ... cut, 8 ...
Screw part, 10 ... hole, 11 ... seat body, 13 ... flange part, 14 ... pin fitting part, 14a ... opening part, 15 ... pin threaded part, 25 ... reinforcing material, 26
... concrete skeleton, 27 ... hole, 28 ... rebar, 29 ... expansion tool

Claims (7)

[Claims] 1. A method for reinforcing a concrete skeleton, comprising forming holes (27) in a concrete skeleton (26) at predetermined intervals, and anchoring the anchor pin main body (1) to the tip of the hole (27). (1b)
A method for reinforcing a concrete skeleton, characterized in that it is fixed from the side and fixed to the concrete skeleton (26) by expanding the tip portion (1b) of the anchor pin body (1) through an expansion tool (29). 2. The anchor pin body (1) has an opening (2) at least at a rear end (1c) thereof, and the opening is formed inside.
It is formed in a pipe shape having a through hollow portion (1a) communicating with (2), and a hole (10) communicating with the through hollow portion (1a) is formed in the peripheral wall of the anchor pin body (1). The method for reinforcing a concrete skeleton according to claim 1. 3. A reinforcing material such as a sheet material or a steel plate on the surface (25).
Is a method of reinforcing a concrete skeleton to which is adhered, and a hole (2) is formed in the concrete skeleton (26) from above the reinforcing material (25).
7) is provided at a predetermined interval, at least a rear end portion (1c) has an opening (2), and a through hollow portion (1a) communicating with the opening (2) is formed, and A pipe-shaped anchor pin main body (1) having a hole (10) communicating with the through hollow portion (1a) on the peripheral wall is fitted into the hole (27) from the tip (1b) side, and the anchor A method for reinforcing a concrete skeleton, characterized in that the pin body (1) is fixed to the concrete skeleton (26) by expanding the tip portion (1b) of the pin body (1) through an expansion tool (29). 4. After fixing the anchor pin main body (1), a pin fitting portion (14) attachable to a rear end (1c) side of the anchor pin main body (1), and the anchor pin main body (1). The pin fitting portion of the seat body (11) provided with an opening (14a) communicating with the opening (2) of (1) and a flange (13) abutting on the reinforcing material (25).
4. A method for reinforcing a concrete frame according to claim 3, wherein the reinforcing member is fixed to the rear end portion of the anchor pin body by pressing the reinforcing member with the flange portion. . 5. A hole (27) is drilled to a position where it intersects a reinforcing bar (28) embedded in a concrete frame (26), and a tip (1b) of the anchor pin body (1) is Rebar (2
The method for reinforcing a concrete skeleton according to any one of claims 1 to 4, which is fixed at a position exceeding 8). 6. A pipe-shaped anchor pin main body (1) having an opening (2) at least at a rear end (1c) thereof and having a through hollow portion (1a) communicating with the opening (2). In the vicinity of the tip portion (1b), protrusions (3), which are protruded so as to face inward,
A notch is formed in the axial direction from the tip (1b) between the protrusions (3), ....
In the anchor pin provided with (6), ..., A hole (10) communicating with the through hollow portion (1a) is formed in the peripheral wall of the anchor pin body (1), and the anchor is provided. Pin body
(1) On the rear end (1c) side, an opening (14a) communicating with the opening (2) of the anchor pin body (1) is formed, and a concrete skeleton (26) or a reinforcing material (25). An anchor pin comprising a seat body (11) having a collar portion (13) capable of contacting the surface of the seat. 7. The rear end portion (1c) of the anchor pin body (1)
A screw part (8) is provided on the side, and the seat body (11) is provided with a pin-threaded part (15) that can be screwed into the screw part (8). The anchor pin according to claim 6, wherein the seat (11) and the seat (1) are configured to be detachable.