JP2001152535A - Reinforcing structure for existing culvert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure capable of giving sufficient earthquake resistance to an existing culvert with simple execution without being affected by the location conditions of a structural body. SOLUTION: A reinforcing frame 15 formed out of an H-steel 13 is brought into contact with the inner face of the existing culvert 11 over the whole periphery and is fixed. A plurality of frame bodies are arranged at prescribed intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing underground structure, and more particularly to a structure for reinforcing an existing culvert.

[0002]

2. Description of the Related Art An existing underground structure such as a culvert has an outer peripheral surface surrounded by ground, so that its vibration characteristics are hardly affected by the inertial force of the structure itself like a ground structure. It is characterized by being easily affected by displacement due to an earthquake and inertia of the ground. In addition, underground structures such as culverts may receive large external forces such as shearing force from the ground during an earthquake, but it is difficult for existing underground structures to reinforce the structure itself. A method of solidifying the ground by improving the ground over a wide area has been performed.

[0003]

However, when the ground around the structure is solidified, extensive ground improvement is required to obtain sufficient seismic performance. It is very difficult to perform, and there is a drawback that the construction cost is also large.

[0004] Accordingly, an object of the present invention is to provide a reinforcement structure which is not affected by the location conditions of a structure and can obtain sufficient earthquake resistance in an existing culvert by simple construction.

[0005]

According to the present invention, according to the present invention, a frame made of steel material is fixed by being in contact with the inner surface of an existing culvert over the entire circumference, and a plurality of the frames are arranged at predetermined intervals. An existing underdrain reinforcement structure is provided.

In the present invention, an H-beam or an I-beam can be used as the steel material. In this case, H
A frame is formed from a shaped steel or an I-shaped steel, and the flange is arranged so as to contact the inner surface of the existing culvert. For example, the flange is fixed with an adhesive or an anchor. This allows
For the shear force acting on the existing culvert from the surrounding ground,
A web of H-beam or I-beam makes it possible to compete.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of an existing underdrain provided with a reinforcing structure 10 according to the present invention, and FIG. 2 is a longitudinal sectional view along line II-II in FIG. Although the culvert 11 in FIGS. 1 and 2 is not shown,
An existing underground structure buried in the ground, the periphery of which is surrounded by the ground, the inner cavity 14 is not filled with water, and the cavity 14 is dry like a common ditch. It is used in. A shear load or a bending load acts on such an existing culvert 11 through the ground, particularly during an earthquake. In order to resist such external force, in the reinforcing structure 10 according to the present invention, each H-shaped steel 13 is fixed at a predetermined interval around the entire inner surface of the culvert 11, whereby a plurality of reinforcing frames 1 are provided.
5 is formed. Here, each reinforcing frame 15 is H
The shaped steel 13 is fixed with an adhesive such as an epoxy resin so that the flange 13a is in contact with the inner surface of the culvert 11, and a through hole is formed in the flange 13a. Is fixed by driving the anchor 12 toward.

As means for fixing the H-section steel 13 to the inner surface of the culvert, either an adhesive or an anchor is used, or both are used as described above, or
Other means can be used.

The application of the present invention is not limited to the following dimensions, but if a specific dimension is shown, a reinforcing structure is installed on an existing culvert having a cross-sectional outer dimension of 300 mm x 300 cm and a wall thickness of 40 cm. When providing, dimensions 100 × 100 × 6 ×
The reinforcing frames 15 can be formed at intervals of 100 cm from the H-shaped steel of No. 8 or the I-shaped steels having dimensions of 150 × 100 × 6 × 9 can be formed at intervals of 150 cm.

Next, the operation of the reinforcing structure 10 according to the present invention will be described. When a shear force acts on the existing culvert 11 from the surrounding ground due to an earthquake, the reinforcing frame 15 of the reinforcing structure 10 opposes the shear force. In particular, since the reinforcing frame 15 is formed annularly along the inner surface of the culvert 11, it exhibits relatively strong shear strength.

Although there is a possibility that the existing culvert 11 may be shear-ruptured in the event of a large earthquake, even in such a case, since the reinforcing frame 15 made of a tough steel material is disposed on the inner periphery, it may be broken. The occurrence of a step can be prevented.

In addition, the bending force acting on the existing culvert 11 is effectively reduced by the hybrid cross-sectional structure in which the existing culvert 11 made of reinforced concrete and the reinforcing frame 15 made of steel are integrated. Can be demonstrated.

[0013]

According to the reinforcing structure of the present invention, a plurality of steel frames are fixed at predetermined intervals so as to abut the entire inner surface of the existing culvert. Therefore, it is not necessary to solidify the ground over a wide area as in the case of measures against earthquake resistance, and therefore, it is possible to reduce the construction cost without being affected by the location conditions of the existing culvert when constructing the reinforcing structure.

Further, in the present invention, it is possible to obtain sufficient seismic resistance in the existing culvert by performing a simple construction such as providing a frame made of a steel material all around the inner surface of the existing culvert.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a reinforcement structure of an existing culvert according to the present invention.

FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG.

[Explanation of symbols]

 10 Reinforcement structure 11 Existing culvert 13 H-section steel (steel) 15 Reinforcement frame (frame)

Claims (2)

[Claims] 1. A reinforcing structure for an existing culvert, wherein a frame made of steel material is fixed in contact with the inner surface of the existing culvert over the entire circumference, and a plurality of the frames are arranged at predetermined intervals. 2. The reinforcing structure according to claim 1, wherein said steel material is made of an H-beam or an I-beam.