JPH0959925A - Existing foundation structure reinforcing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of both of a columnar structure and a support structure to support the columnar structure when the columnar structure is erected on the support structure and to perform reinforcement of a support structure itself. SOLUTION: A cylinder body 4 serving as an outer peripheral reinforcing material and centering around a base part 1a of a bridge leg 1 is built on a foundation 2 being a support structure on which the bridge leg 1 being a columnar structure is erected. Vertical anchors 5 in the foundation 2 are arranged in the cylinder body 4. Further, peripheral direction reinforcing materials 6 of the bridge leg 1 are arranged in the cylinder body 4 and expansive concrete 7 being an expansive permanent material is placed in the cylinder body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing foundation structure reinforcing method for reinforcing a footing foundation or a slab supporting structure for supporting an existing pier or columnar member for earthquake-proof reinforcement structure. .

[0002]

2. Description of the Related Art A columnar structure such as a reinforced concrete (RC) pier is erected at its lower end on a foundation provided with footing portions, and this foundation is supported by support piles. Further, similar reinforced concrete columnar structures are often erected on reinforced concrete slabs as underground structures.

[0003] In the event of an earthquake, it is necessary to reinforce the footing foundation and the supporting structure, which is a reinforced concrete slab, to enhance the seismic resistance. Conventionally, the RC thickening method can be considered as one of them.

This is a construction method in which a reinforcing bar and concrete are placed on an existing reinforced concrete slab so as to surround an existing columnar structure, and the existing reinforced concrete slab is thickened.

As another method, there is a steel plate winding method, in which a steel plate is laid on the surface of an existing reinforced concrete slab and integrated by welding or the like. This is a method of filling and integrating a filler such as non-shrink mortar.

[0006]

Since a large stress is generally generated at a joint between a columnar structure and a supporting structure such as a footing foundation or a reinforced concrete slab that supports the columnar structure, it is necessary to reinforce the existing structure. Has been regarded as a difficult site. In particular, when the upper surface of a supporting structure such as a footing foundation or reinforced concrete slab is in a tensile stress state, in order to effectively transmit the force from the columnar structure to the supporting structure, the columnar structure and the reinforced concrete slab are supported. It was necessary to increase the degree of bonding with the structure.

In the RC thickening method, the reinforcing bar cannot be arranged immediately below the existing columnar structure, and the degree of coupling between the thickened supporting structure such as a reinforced concrete slab and the columnar structure is weak.

On the other hand, in the steel plate winding method, it is difficult to reinforce the joint between the steel plate and the existing columnar structure, and this portion is said to be a weak point.

The object of the present invention is to eliminate the disadvantages of the conventional example, and in the case where the columnar structure is erected on the support structure, the degree of rigidity of both the columnar structure and the support structure supporting the columnar structure. It is to provide an existing foundation structure reinforcing method that enhances the structure and also enables reinforcement of the support structure itself.

[0010]

In order to achieve the above-mentioned object, the present invention is, firstly, as an outer peripheral reinforcing member centering on the base of a columnar structure on a support structure on which the columnar structure stands. Disposing a cylindrical body, arranging a vertical anchor to the supporting structure inside the cylindrical body, and further injecting an expansive permanent material into the cylindrical body. Second, a columnar structure inside the cylindrical body. Arranging the circumferential reinforcement of the article, thirdly, the circumferential reinforcement of the columnar structure is attached to the vertical anchor, and fourth, the circumferential reinforcement of the columnar structure is inside the cylindrical body. The idea is to arrange multiple concentric circles.

According to the first aspect of the present invention, due to the ring restraining effect of the cylindrical body as the outer peripheral reinforcing material, a load bearing mechanism as if a tensile resistance material is arranged so as to penetrate through the base of the existing columnar structure. Can be formed, and by restraining the base of the columnar structure with this cylindrical body, it is also effective in improving the deformability of the columnar structure.

According to the second aspect of the present invention, in addition to the above function, the circumferential reinforcing material is arranged in the circumferential direction of the columnar structure, so that the circumferential reinforcing material restrains the pillar base portion. The effect is exhibited, and the reinforcing effect in the column axis direction can be further enhanced.

According to the third aspect of the present invention, the circumferential reinforcing member can be easily installed at an appropriate position in the cylindrical body before the expansive concrete is placed by attaching the circumferential reinforcing member to the vertical anchor. According to the present invention described in 4, by further arranging the circumferential reinforcing members in a concentric circular shape in the cylindrical body, the high tensile resistance is increased, and the vertical anchors for mounting the same are also concentric circular shape. Since they are arranged, both the degree of rigidity of the columnar structure and the supporting structure and the reinforcing effect of the supporting structure itself are increased.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an embodiment of an existing foundation structure reinforcing method of the present invention,
FIG. 2 is a transverse plan view of the same as above, showing a pier 1 as a columnar structure and a footing portion 2a as a support structure on which the pier 1 is erected
It is the case of the foundation 2 having. Reference numeral 3 in the figure denotes a support pile that supports the foundation 2.

The present invention is a base 2 having a footing portion 2a.
A cylindrical body 4 serving as an outer peripheral reinforcing member having the base 1a of the pier 1 which is a pillar as the center is disposed on the above. The cylindrical body 4 is composed of a ring beam made of steel plate, shaped steel, FPR (fiber reinforced plastic) or the like.

The vertical anchor 5 for the foundation 2 is arranged in the cylindrical body 4. In the present embodiment, the vertical anchor 5 is arranged.
Are arranged at appropriate intervals in the circumferential direction of the base portion 1a of the pier 1, and are concentrically arranged in multiples around the pier 1 as a center.

Further, inside the cylindrical body 4, the base portion 1 of the pier 1 is
The circumferential reinforcing material 6 of a is arranged by binding the vertical anchor 5 to the vertical anchor 5 as a support. The circumferential reinforcing member 6 is made of a material such as a reinforcing bar, FPR, or other high tensile resistance material.

As described above, the vertical anchors 5 are arranged concentrically around the bridge pier 1 as a center. As a result, the circumferential reinforcing members 6 attached thereto are also arranged concentrically inside the cylindrical body 4. .

Then, expansive concrete 7 as an expansive permanent material is placed in the cylindrical body 4. Instead of this expansive concrete 7, it is also possible to use expansive mortar or other permanent material capable of controlling a certain degree of expansion and maintaining a restraining pressure above a certain level.

As described above, the cylindrical body 4 and the expansive concrete 7 act as a tensile resistance member, and the vertical anchor 5 passes through the expansive concrete 7 and the cylindrical body 4 to support the pier. It indirectly binds to the base 1a of 1.

As a result, a load-bearing mechanism can be formed at the joint between the base 1a of the pier 1 and the foundation 2 as if a tensile resistance material penetrating the base 1a of the pier 1 is arranged.
By restraining the base portion 1a of the pier 1 with the cylindrical body 4, the deformability of the pier 1 is also improved.

In the above embodiment, the pillar structure 1 is the bridge pier 1, and the foundation 2 having the footing portion 2a as the support structure on which the bridge pier 1 is erected has been described. It is also applicable to the case where the supporting structure is a reinforced concrete slab or the like.

[0023]

As described above, in the existing foundation structure reinforcing method of the present invention, when the columnar structure is erected on the support structure, the columnar structure and the support structure supporting the columnar structure are provided. It is possible to increase the degree of rigidity of both of them and also to reinforce the support structure itself easily and at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of an existing foundation structure reinforcing method of the present invention.

FIG. 2 is a cross-sectional plan view showing one embodiment of an existing foundation structure reinforcing method of the present invention.

[Explanation of symbols]

 1 ... Bridge pier 1a ... Base part 2 ... Foundation 2a ... Footing part 3 ... Support pile 4 ... Cylindrical body 5 ... Vertical anchor 6 ... Circumferential reinforcement 7 ... Expandable concrete

Claims (4)

[Claims] 1. A cylindrical body as an outer peripheral reinforcing member having a base of the columnar structure as a center is disposed on a support structure on which the columnar structure is erected, and a vertical direction to the support structure is provided inside the cylindrical body. An existing foundation structure reinforcement method characterized by placing anchors and placing expansive permanent material inside the cylinder. 2. The existing foundation structure reinforcing method according to claim 1, wherein a circumferential reinforcing member for a columnar structure is arranged inside the cylindrical body. 3. The existing foundation structure reinforcing method according to claim 2, wherein the circumferential reinforcing member of the columnar structure is attached to a vertical anchor. 4. The columnar structure circumferential reinforcing material is multiply arranged concentrically inside the cylindrical body.
The existing foundation structure reinforcement method described.