JP2003090012A - Pier reinforcing structure by corrugated steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pier reinforcing structure by a corrugated steel material being reinforced by the corrugated steel material and improving buckling- resistant characteristics while also enhancing vertical compressive strength. SOLUTION: In the pier reinforcing structure by the corrugated steel material, a reinforcing sheathing material (2) composed of the corrugated steel material is wound on the whole outer circumference of a pier body (1) to be reinforced so that a corrugation turns vertical and the whole corrugated steel material is fastened and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier reinforcement structure made of corrugated steel in which a reinforcing exterior material made of corrugated steel (large deck plate) is wrapped around a pier and tightly secured.

[0002]

2. Description of the Related Art Various types of railways such as Shinkansen, conventional lines, private railways, monorails, highways, expressways for cities, etc. are made of long girders from the viewpoint of effective use of land and mitigation of pollution such as noise and vibration. There are many elevated types that are supported by.

Not only bridges in rivers but also roads provided in mountainous areas are used to cross tunnels over highlands such as mountains and hills to cross lowlands such as valleys and rivers, and many of these piers are also used. Supported by.

In addition to the most widely used concrete, steel materials such as bricks and stone materials are also used as materials for such bridges, and they are appropriately selected according to the type of load, scale, application, etc. . Structurally, girder bridge, arch bridge,
There are various types such as ramen bridges and suspension bridges.

However, for automobile roads and railway track bridges, which place importance on economical efficiency and practicality, reinforced concrete bridges in which girders are supported by bridge piers made of reinforced concrete or PS concrete are often used. With regard to such reinforced concrete bridge piers, the Great Hanshin-Awaji Earthquake caused the bridge piers to be destroyed and the motorway to fall sideways.

When the bridge is destroyed by such an earthquake, the reinforced concrete bridge piers were damaged by buckling due to the severe earthquake, and the adjacent piers that were subjected to unequal stress were also unable to withstand this and similarly damaged. It was new to my memory that he had fallen over and that it took several months to complete recovery.

There is a possibility that such damage may affect all bridges using reinforced concrete bridge piers, and countermeasures against it are urgently needed. Currently, the reinforcement measures actually adopted are to wind steel plate, FRP plate reinforced with glass fiber or carbon fiber, etc. around the entire circumference of the pier, which aims to prevent the buckling phenomenon of the pier. It is what The bridge pier that causes buckling is not limited to reinforced concrete, but may be a conventional bridge made of brick, stone, or the like.

When attempting to prevent buckling of various bridge piers in this way, although the strength of the reinforced exterior material is determined by a computer-aided simulation or the like, it is not easy to estimate the seismic intensity, and the type and thickness of steel sheet, It is necessary to give sufficient consideration to the mounting method. In particular, steel plates and FRP plates are intended to prevent damage due to lateral displacement of pier members at buckling points, but steel plates and FRP plates themselves do not have the function of supporting vertical (longitudinal) compressive loads, as is well known. ,
It is hard to say that it is a perfect reinforcement measure.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is reinforced by a corrugated steel material to enhance the anti-buckling property and at the same time improve the strength against a compressive load in the vertical (vertical) direction. It is an object of the present invention to provide a pier reinforcement structure using corrugated steel that can be used.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to wind a reinforcing exterior material 2 or 12 made of corrugated steel material around the entire circumference of a pier body 1 or 11 to be reinforced in a direction in which the corrugations are oriented vertically. This is solved by a bridge pier reinforcement structure made of corrugated steel in which the entire corrugated steel is tightened and fixed.

In the bridge pier reinforcement structure of the corrugated steel material according to the present invention, ready-mixed concrete or mortar can be filled in the gap between the convex portion of the corrugated steel material and the main body of the pier. Further, as the tightening and fixing means for the entire corrugated steel material, it is possible to employ welding of the end portions of the corrugated steel material, and further, the tightening adjusting means 4 is attached to the end portions of the steel strip, the steel rod, the wire rope, etc. It is possible to adopt a method in which the provided tightening members 3 are attached at appropriate intervals to carry out.

Further, this pier reinforcement structure is applicable not only when reinforcing the existing piers to increase the seismic strength, but also when applied to the new piers as a formwork from the beginning,
Even after the concrete is solidified, it can be left as it is as a reinforcing exterior material.

The corrugated steel material that plays an important role in the pier reinforcement structure according to the present invention is, as shown in FIG. 4, a corrugated steel material for general structure (in conformity with JIS G-3101) which is corrugated. It is a large deck plate that is a high-strength construction material marketed under the trade name of plank sheet in accordance with JIS G-3352. The plate thickness of the steel plate that is the material for this large deck plate is various from 2.3 mm to 6.0 mm in accordance with the JIS standard, and the structure, cross-sectional shape, height, and girder weight of the pier to be reinforced are supported. ,
A steel plate having an appropriate size can be selected according to the application, the degree of importance, and the like.

The large deck plate (corrugated steel material) needs to be fitted to the outer surface of the pier, but when reinforcing the existing pier, the required number of joints are made according to the design dimensions of the pier,
Configure a member that is plastically deformed by bending with a desired curvature,
Install and tighten the fasteners on site.

In the new bridge pier, the reinforcing exterior material itself formed by the large deck plate (corrugated steel material) can be used as a formwork, and is used as an exterior member as it is after solidification of concrete. Before the construction work, the rebars necessary for the foundation and bridge piers are assembled in advance, and the corrugated steel reinforced exterior material is erected around the vertical legs as a form, and ready-mixed concrete is poured.

According to the pier reinforcement structure of corrugated steel according to the present invention, the pier reinforcement exterior material made of corrugated steel firmly holds the entire circumference of the pier to be reinforced inside, and the flat steel plate or FRP is used.
It is possible to achieve high-strength seismic reinforcement as compared with a plate reinforcement. Not only the resistance to rolling is increased, but also a sufficient reinforcing effect is obtained against vertical loads, and the overall seismic resistance can be improved.

As described above, as a result of covering the entire outer periphery of the pier with the corrugated steel material, it becomes possible to prevent the occurrence of embrittlement and cracking of the concrete, and it is possible to achieve the reinforcing effect and the extension of the life exceeding the initial cost increase. .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be disclosed with reference to the accompanying drawings. FIG. 1 is a cross-sectional view and a front model view showing a bridge pier reinforcing structure using a corrugated steel material according to the present invention. Although the concrete pier main body 1 has a cylindrical shape in this embodiment, the pier main body 1 may have an oval, elliptical or rectangular cross section.

The reinforced exterior material 2 made of corrugated steel surrounds the entire circumference of the pier, and at appropriate points on the outer periphery of the reinforced exterior material 2, for example, at the root side, above the girder material, and at several places in the middle. The tightening member 3 including the tightening / adjusting means 4 such as a band, a steel rod, and a wire rope is wound.

By this tightening member 3, the reinforcing exterior material 2 is brought into close contact with the entire pier body 1. It should be noted that it is desirable to attach such a tightening member 3 in order to maintain the tightened state in the reinforcement work of the existing pier,
The reinforcing exterior material 2 used for a new bridge pier that functions as a formwork during concrete pouring of the pier body 1 is not always necessary because it is already in close contact with the pier body during construction. However, it may be attached from the viewpoint of improving the strength of the pier.

Furthermore, in the reinforcement work of the existing pier,
Fresh concrete and / or mortar or the like may be placed between the pier body 1 and the convex grooves of the reinforcing exterior material 2. By thus filling the space between them, the reinforcing effect can be further enhanced. In the new bridge pier, the convex groove of the reinforcing exterior material 2 is filled with ready-mixed concrete from the beginning, and exhibits sufficient strength.

FIG. 2 is a cross-sectional view showing a state in which a reinforced exterior material 12 made of a corrugated steel material is wound around a pier main body 11 having a substantially rectangular cross section for reinforcement. In the case of reinforcing such a bridge pier having a cross section other than a circular shape, it is necessary to sufficiently consider the outer shape of the pier main body 11 before processing the reinforcing exterior material 12 in a factory. In particular, when reinforcing existing piers, care should be taken to ensure that corrugated steel corrugations hit the corners of the pier body appropriately.

FIG. 3 shows an embodiment of a tightening member 3 provided with a tightening adjusting means 4 for tightening and fixing the outer periphery of the entire reinforcing exterior material made of corrugated steel. In this embodiment, the steel strip 30 is used as the fastening member, but other round steel rods, wire ropes, etc. may be used. By tightening the bolt 36 that is inserted through the round holes of the tightening ears 32, 34 provided at the end of the steel strip 30, the tightening means is moved as shown by the double-headed arrow X and the tightening margin Y can be adjusted. Are configured. The tightening adjustment means shown in FIG. 3 is merely an example of a simple structure, and it is needless to say that other similar means having the same function can be adopted.

[0024]

As described above, according to the bridge pier reinforcing structure of the corrugated steel material according to the present invention, the corrugated steel material processed in advance in the factory is assembled on site to form the reinforcing exterior material,
Surround the entire pier body. The present invention, in the new bridge pier, the reinforcing exterior material formed as described above functions as a formwork, and after pouring ready-mixed concrete including the entire rebar formed inside it, after the concrete has solidified, It functions as a metal protective exterior material for the pier body.

When reinforcing an existing reinforced concrete bridge pier, a reinforcing exterior material corresponding to the outer shape of each bridge pier is formed, and the entire circumference of the pier main body is wound on site to perform the reinforcing work. The corrugated steel material of the reinforcing exterior material configured in this manner exerts a reinforcing effect against any vertical or horizontal load acting on the pier, the buckling phenomenon of the pier can be reliably prevented, and the earthquake resistance is improved.

Therefore, the structure for reinforcing a pier made of corrugated steel according to the present invention can be easily applied not only to a new bridge pier but also to a reinforcement of an existing pier. In particular, in the case of a new bridge pier, since the formwork also serves as a surface protective material as it is, in addition to a sufficient reinforcing effect, it is possible to reliably prevent concrete deterioration and cracks due to uneven drying, and for a long period of time. The design strength can be maintained and safety can be ensured.

[Brief description of drawings]

FIG. 1 is a cross-sectional (A) and front (B) model diagram showing the basic structure of a pier reinforcement structure using corrugated steel according to the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a square cross-section pier of a pier reinforcement structure using corrugated steel according to the present invention.

FIG. 3 is a diagram illustrating a configuration example of a fastening tool applied to a bridge pier reinforcing structure using a corrugated steel material according to the present invention.

FIG. 4 is a perspective view showing a structural example of a corrugated steel material (large deck plate) used in the present invention.

[Explanation of symbols]

1 Pier body 2 Reinforcement exterior material (corrugated steel material) 3 Tightening member 4 Tightening adjustment means 11 Pier body 12 Reinforcement exterior material (corrugated steel material) 30 Steel strip (clamping member) 32, 34 tightening ears 36 volts

Claims (4)

[Claims] 1. A reinforcing exterior material made of corrugated steel material is wound around the entire periphery of a pier main body to be reinforced in a direction in which the corrugations are in the vertical direction, and the entire corrugated steel material is tightly fixed. Bridge pier reinforcement structure with corrugated steel. 2. The pier to be reinforced is a new pier and the reinforced exterior material made of corrugated steel is used as a formwork during concrete pouring.
A pier reinforcement structure made of corrugated steel as described in. 3. The reinforcement pier to be reinforced is an existing pier, and the corrugated steel material is a factory-processed reinforcement exterior material that is wound and fixed in the field. The outer periphery of the reinforcement exterior material is tightened by a tightening member. The pier reinforcement structure with the corrugated steel material according to claim 1, wherein 4. The corrugated steel material according to claim 1, wherein fresh concrete or mortar is filled between the pier main body to be reinforced and the convex portion of the reinforcing exterior material. Reinforcement structure by pier.