JPH0960307A - Reinforcing method for concrete body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, securely, and firmly reinforce a concrete body like an existing concrete column or wall face superannuated or weakened by an earthquake for instance. SOLUTION: Reinforcing plates 3 arranged at every specified distance with spacers 2 on the surface of an existing concrete body P are fixed on the concrete body P through widening type anchors 1. Grout S is charged between the reinforcing plates 3 and the concrete body P and cured. The widening type anchor 1 is constituted of a tapered wedge piece having a female screw hole and a widening sleeve for instance and a fitting bolt 4 is screwed in the female screw hole to fix the reinforcing plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reinforcing a concrete skeleton such as an existing concrete pillar or wall surface that has been deteriorated or weakened due to an earthquake or the like.

[0002]

2. Description of the Related Art In the case of reinforcing an existing concrete skeleton that is deteriorated or weakened as described above, conventionally, for example, the inside of the concrete skeleton is filled with an injection material such as cement or resin, or the crack is filled. The method is adopted such as adding a new concrete skeleton by inserting a reinforcement in the concrete skeleton.

However, as in the former case, it is often difficult to secure sufficient strength only by filling the pouring material, and in the case of adding a new concrete skeleton like the latter, the entire concrete skeleton is There is a problem that the occupied space increases and the construction is troublesome.

Therefore, a reinforcing plate such as a metal plate is coated on the surface of an existing concrete skeleton at a predetermined interval, and an injection material such as cement or resin is filled and solidified between the reinforcing plate and the concrete skeleton. The method of reinforcement is done.

However, conventionally, since the structure of the concrete skeleton is simply covered with the reinforcing plate, there is a problem that the attachment of the reinforcing plate to the concrete skeleton is unstable, and sufficient strength cannot always be ensured, and in many cases, reinforcement is performed. There is a problem in that the space between the plate and the concrete skeleton varies, and it is impossible to uniformly and satisfactorily fill the injection material.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and provides a method for reinforcing a concrete skeleton capable of easily and reliably and firmly reinforcing an existing concrete skeleton. With the goal.

[0007]

In order to achieve the above object, the method for reinforcing a concrete skeleton according to the present invention has the following constitution.

That is, an expansion type anchor is placed on the surface of an existing concrete skeleton, and a reinforcing plate which covers the surface of the concrete skeleton at predetermined intervals via a spacer is fixed to the anchor, and the reinforcing plate. It is characterized in that an injecting material is filled between the concrete and the concrete body so as to be solidified.

[0009]

As described above, the expansion type anchor is placed on the surface of the concrete skeleton, and the anchor is fixed to the surface of the concrete skeleton with the reinforcing plate covered with the spacers at predetermined intervals. By filling the filling material between the reinforcing plate and the concrete skeleton, the existing concrete skeleton can be reinforced easily, reliably and strongly.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The concrete construction method for reinforcing a concrete skeleton according to the present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is a cross-sectional plan view of an embodiment in which the reinforcing method according to the present invention is applied to an existing concrete column, FIG. 2 is a partially enlarged cross-sectional plan view thereof, and FIG. 3 is a front view thereof.

In the embodiment shown in the drawing, an expansion type anchor 1 is placed on an existing concrete pillar P, and a reinforcing plate 3 is arranged on the outer peripheral surface of the pillar P with a spacer 2 at a predetermined interval. At the same time, the reinforcing plate 3 is fixed to the anchor 1 with the mounting bolts 4, and the injection material S such as cement or resin is filled between the reinforcing plate 3 and the pillar P.

As shown in FIG. 4, the anchor 1 has a slotted groove 11a on one end side and a large number of groove lines 1 on the peripheral surface for preventing slippage.
1b, and a wedge piece 12 having a substantially conical tapered surface 12a at one end side. By pushing the wedge piece 12 into the expansion sleeve 11, the sleeve 11 is formed as shown in FIG. It is a structure to be expanded to. A female screw hole 12b is formed on the other end side of the wedge piece 12,
The reinforcing bolt 3 is fixed by screwing the mounting bolt 4 into the female screw hole 12b.

In the present embodiment, countersunk bolts are used as the mounting bolts 4, and counterbore holes 3a are formed in the reinforcing plate 3 as the bolt insertion holes as shown in FIG. So that it doesn't stick out on the surface. The counterbore 3a may be formed in advance at the position where the reinforcing plate 3 is attached to the anchor 1. A hexagonal hole 4a is formed in the head of the bolt 4 described above.

The material of the member constituting the anchor 1 is appropriate, but the sleeve 11 is a material having high toughness and little cracking, such as STKM (carbon steel pipe for machine structure) or SWCH (carbon steel for cold heading). Line) or SWRC
It is preferable to use H ((carbon steel wire rod for cold heading) or SGH (carbon steel pipe for piping) and the like, and the wedge piece 12 has a high tensile strength material such as SCM435 (chromium) whose tensile strength is increased by quenching or the like. Molybdenum steel), S45C (carbon steel for machine structure) or SNB7
(High temperature alloy steel bolt material) or the like may be used. Further, the mounting bolt 4 may be made of a high-tensile material like the wedge piece 12, and for example, the above-mentioned SCM435 or SNCM447 (nickel chrome molybdenum steel material) may be used.

Further, the material of the reinforcing plate 3 is also appropriate, and for example, a steel plate such as iron or stainless steel may be used, or a hard synthetic resin plate may be used. Further, as the spacer 2, as long as the reinforcing plate 3 can be held at a predetermined interval with respect to a concrete pillar or the like, the material and shape thereof are arbitrary, and for example, an existing nut or the like can be used. The spacer 2 may be fixed in advance to the inner surface of the reinforcing plate 3 or the surface of a concrete column by welding or adhesion.

When the anchor 1 is placed, as shown in FIG. 5A, a small hole h slightly larger than the sleeve 11 is formed in an existing concrete pillar or the like by a drill or the like. Then, the anchor 1 including the sleeve 11 and the wedge piece 12 is inserted into the small hole h as shown in FIG. At this time, the wedge piece 12 may be lightly press-fitted into the sleeve 11 in advance.

Next, as shown in FIG. 1C, the sleeve 11
Is hammered in through the adapter A or the like. Then, the distal end portion of the sleeve 11 widens and bites into the inner surface of the small hole h to be fixed and prevented from coming off. At this time, if a material having high toughness as described above is used for the sleeve 11, even if a high-strength wedge piece 12 is driven in, the sleeve 11 expands without breaking in the small hole h, and an appropriate anchor strength is obtained. Expressed and maintained.

In this state, the reinforcing plate 3 is arranged on the surface of the concrete pillar P at a predetermined interval via the spacer 2 as shown in FIG. 2D, and the mounting bolts 4 are attached as shown in FIG.
Is screwed into the female screw hole 12b of the wedge piece 12 to be fixed. In this state, the reinforcing plate 3 is in a state in which a sufficient mounting strength is maintained for the pillar P.

Next, as shown in FIG. 2 (f), an injecting material S such as cement or resin is filled between the reinforcing plate 3 and the surface of the concrete column P to be solidified. At that time, the reinforcing plate 3 is Concrete pillar P through mounting bolt 4 and anchor 1
It is firmly fixed to the inner wall of the reinforcing plate 3 and is not accidentally displaced, and the injecting material S penetrates between the small hole h and the anchor 1 and into the cracks of the concrete column P, and the inner surface of the reinforcing plate 3 and the concrete column P. Is solidified and solidified on the surface of. In this way, the reinforcing plate 3 attached to and supported by the pillar P
Function as a part of the structural member forming the pillar P.
Therefore, it is possible to firmly reinforce in a small space and secure sufficient column strength without adding new reinforcing bars or the like.

Although the above-mentioned embodiment shows an example in which it is applied to an existing concrete column, it can be applied to a concrete wall surface, a bridge, and various other concrete frames. Further, in the above embodiment, a flat head bolt is used as the mounting bolt 4, but
Hexagon bolts may be used, or nuts may be screwed onto all-thread bolts.

[0021]

As described above, in the method for reinforcing a concrete skeleton according to the present invention, the expansion type anchor 1 is driven on the surface of the existing concrete skeleton, and the anchor 1 is provided with the spacer 2 on the surface of the concrete skeleton. The reinforcing plate 3 covered with a predetermined space is fixed, and the injecting material S is filled between the reinforcing plate 3 and the concrete skeleton to be solidified, so that the reinforcing plate 3 interposes the anchor 1. It is possible to firmly fix it to the concrete skeleton and increase the strength, and to prevent the reinforcing plate 3 from being inadvertently displaced to cause a variation in the space between the concrete skeleton and to fill the injection material S evenly. Therefore, there is an effect that an existing concrete skeleton can be reinforced easily, reliably and strongly.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a concrete column to which a reinforcing method according to the present invention is applied.

FIG. 2 is an enlarged cross-sectional plan view of a portion of FIG.

FIG. 3 is a front view thereof.

FIG. 4 is an exploded view of an anchor and a mounting bolt.

FIG. 5 is an explanatory view showing a construction procedure of a reinforcing construction method according to the present invention.

[Explanation of symbols]

 1 Anchor 11 Sleeve 12 Wedge Piece 2 Spacer 3 Reinforcing Plate 4 Mounting Bolt P Concrete Column S Injection Material

Claims (3)

[Claims] 1. A reinforcing plate, which is arranged on the surface of an existing concrete skeleton at predetermined intervals by spacers, is attached to and supported by the concrete skeleton via an expansion anchor.
A method for reinforcing a concrete skeleton, characterized in that an injection material is filled between the reinforcing plate and the concrete skeleton so as to be solidified. 2. The expansion type anchor comprises a tapered wedge piece having a female screw hole and a expansion sleeve, and a mounting bolt is screwed into the female screw hole to mount and support the reinforcing plate. Item 1. A method for reinforcing a concrete skeleton according to Item 1. 3. The method for reinforcing a concrete skeleton according to claim 2, wherein a countersunk bolt is used as the mounting bolt.