JP2002227134A - Reinforcing structure for concrete floor board steel girder bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure for a concrete floor board steel girder bridge capable of reinforcing a ground cover and a wall handrail for forming a high soundproof wall and coping with a weight increase caused by reinforcement. SOLUTION: The RC(reinforced concrete) floor board girder bridge 10 is reinforced with a side section reinforcing structure 20 at formation portions of the ground cover 12A and the wall handrail 12B, and it is reinforced with a central section reinforcing structure 30 at a central section in the width direction. In the side section reinforcing structure 20, reinforcing steel plates 21 (an outside plate 21A and an inside plate 21B as side section reinforcing plates) arranged on both the inside and outside of the wall handrail 12B are fastened and fitted by fastening bolts 23 penetrating the reinforcing steel plates 21 and the wall handrail 12B. The upper edge section of the outside plate 21A on the outer face side is extended to the prescribed height and integrally formed with the soundproof wall 24, and its lower edge is connected to an outer main girder 11A by a diagonal side plate 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a concrete slab steel girder bridge for reinforcing an existing concrete slab steel girder bridge supported by a steel main girder.

[0002]

2. Description of the Related Art In a steel girder bridge constructed by supporting a floor slab by a steel main girder extending in the bridge axis direction, a reinforced concrete slab formed of reinforced concrete on the floor slab (hereinafter referred to as an RC slab). ) Is often used.

[0003] RC floor slabs are constructed by providing a formwork on a main girder, assembling a reinforcing bar inside and casting concrete, and a steel girder is a dowel planted on the upper surface of the steel girder. Are buried in the RC slab and connected to transmit shear force.

[0004]

Recently, in existing steel girder bridges using RC floor slabs as described above, it is desired to increase the height of soundproof walls as a countermeasure against noise. In order to increase the wind load, it is necessary to reinforce the ground cover and the height of the wall to be installed.

[0005] Further, it is necessary to repair and reinforce RC floor slabs which have been damaged by cracks or the like due to an increase in heavy vehicles or insufficient thickness of floor slabs. There is also a demand for reinforcement in advance.

As a reinforcement structure of the RC floor slab, there is known a reinforcement structure called a so-called under deck panel construction method in which a steel plate positioned along the back surface is joined to a main girder and reinforced. There is a problem that dead load increases due to a simple reinforcing structure, and external force acting on the main girder increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to reinforce a ground cover or a railing to enable a high soundproof wall and to cope with an increase in weight due to the reinforcement. The purpose of the present invention is to provide a reinforcing structure for a steel girder bridge on a concrete slab.

[0008]

According to the present invention, there is provided a reinforcing structure of a concrete slab steel girder bridge, wherein the reinforced concrete slab is supported by a steel girder. A side reinforcing plate fixedly stretched on the outer surface of the side edge convex portion of the floor slab, and a lower connecting reinforcing plate that couples the side reinforcing plate and the steel main girder, the lower connecting reinforcing plate includes: The steel slab and the reinforced concrete floor slab are configured to form a closed section at a position separated from the lower surface of the reinforced concrete floor slab.

[0009] Further, the side reinforcing plate extends at a predetermined height to form a soundproof wall.

Further, in a steel girder bridge of a concrete slab slab in which a reinforced concrete slab is supported by a steel main girder, a lower connecting reinforcing plate is provided between the steel girder and a predetermined distance from the lower surface of the reinforced concrete slab. It is configured to be fastened and fixed in an erected state, so that a closed cross section is formed by the lower connection reinforcing plate, the steel main girder, and the reinforced concrete slab.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A shows an example of a reinforcement structure of a concrete girder bridge of a concrete slab according to the present invention.
Cross-sectional view of steel girder bridge 10 for C floor slab, (B) shows R before repair.
FIG. 2 is a cross-sectional view of the C floor slab steel girder bridge 10 ′, and FIG. 2 is a partially enlarged view.

The illustrated RC deck slab steel bridges 10 and 10 'are provided with a plurality of main girder 11 (outer main girder 11A and inner main girder 11B) extending in the direction of the bridge axis provided at predetermined intervals in a direction perpendicular to the bridge axis. The main spar 11 is supported by a pier (not shown) and installed.

The main girder 11 has flanges (upper flanges 11a, 11a,
An I-shaped steel girder with a lower flange 11b),
The lower flange 11b is supported on the pier via a bearing.

[0015] Between the outer main girder 11A and the inner main girder 11B, a pair of inclined structures 15 (FIG. 1 (A)) arranged at predetermined intervals in the bridge axis direction.
The floor slab 12 (not shown) is formed of reinforced concrete (not shown) in which a reinforcing bar is disposed, and is provided by a dowel 13 planted on the upper surface of the upper flange 11a of the main girder 11. It is connected to the main girder 11 so as to transmit the shearing force. On the upper side, a pavement 14 having a predetermined thickness is constructed by asphalt or the like.

At the side edge of the floor slab 12, a ground cover 12A having a predetermined width is projected as a side edge projection, and a wall height column 12B having a predetermined thickness is integrally formed on the ground cover 12A at a predetermined height. Has been established.

The RC slab steel girder bridge 10 reinforced by the reinforcing structure has a ground covering 12A and a side rail 12 which are side edge projections.
The portion where B is formed is reinforced by the side reinforcing structure 20, and the center in the width direction is reinforced by the center reinforcing structure 30.

As shown in FIG. 2 which is an enlarged sectional view, FIG. 3 which is a side view thereof, and FIG. 4 which is an AA sectional view of FIG. Each of the reinforcing steel plates 21 (the outer plate 21A and the inner plate 2 as side reinforcing plates) having a predetermined thickness, which are bonded and arranged via the adhesive 22 respectively.
1B) is fastened in a co-tightened state by fastening bolts 23 of high-strength bolts penetrating the reinforcing steel plate 21 and the wall rail 12B, and furthermore, the outer side plate 21A on the outer side thereof is
The upper edge is extended to a predetermined height to form a soundproof wall 24 integrally, and the lower edge is connected to the main girder 11 (outer main girder 11A) by a slanted side plate 25 as a lower side connecting reinforcing plate. It is configured.

The oblique side plate 25 has a vertical portion 25B on the upper edge and a horizontal portion 25C on the lower edge of the side plate body 25A inclined at a predetermined angle.
And a plurality of reinforcing ribs 25D extending in the bridge axis direction are provided on the inner surface side of the side plate main body 25A at predetermined intervals in a direction orthogonal to the bridge axis. Lateral ribs 25E orthogonal to these are arranged at predetermined intervals in the bridge axis direction and are firmly configured.

Such an oblique side plate 25 has a vertical portion 2 at the upper edge.
5B is overlapped with the outside of the outer plate 21A by a predetermined width and joined by welding, and the end of the horizontal rib 25D on the horizontal portion 25C side is attached to the belly plate 11w of the outer main girder 11A via the bracket 26 via the bolt 26. The horizontal part 25
C is fixed so as to coincide with the lower flange 11b of the main girder 11. That is, the floor slab 12 and the main girder 11 are provided so as to be connected to each other. The inclined plate 25 is divided into a predetermined length in the bridge axis direction, and is joined after installation.

According to the side reinforcing structure 20 as described above,
The outer plate 21A reinforces the wall tall section 12B, and the outer plate 21A and the outer main girder 11A are connected to the oblique side plate 25, so that the outer plate 21A and the wall tall section 12B are connected to the main girder 1B.
1A, the soundproof wall 24 can be extended above the outer plate 21A. In addition, floor slab 12
Of the outer main girder 11A and the outer main girder 11
A and the inclined side plate 25 form a closed cross section, and the rigidity of the projecting portion of the floor slab 12 can be improved, so that the outer side plate 21A including the soundproof wall 24, the inner side plate 21B, and the inclined side plate 2
5 can cope with an increase in dead load. Further, since the lower side surface of the overhanging portion of the floor slab 12 is covered with the inclined plate 25, the scenery (appearance) can be improved and the soundproof effect can be obtained.

In the above configuration, the soundproof wall 24 is not covered by the ground cover 12.
A and an outer plate 21A stretched on the outer surface of the wall height section 12B are integrally formed to extend at a predetermined height.
4 may be connected to the outer plate 21A. However, a more rational configuration can be achieved by integrally forming the outer plate 21A and the soundproof wall 24 as in the present configuration example.

The central reinforcing structure 30 is provided with an under deck panel 31 which is a reinforcing structure by a so-called under deck panel construction method between the outer main girder 11A and the inner main girder 11B, and a lower connecting plate as a lower connecting reinforcing plate. The reinforcement panel 32 is constructed by being erected.

The under deck panel 31 has a longitudinal rib 31B extending in the bridge axis direction on the lower surface side of a supporting steel sheet 31A formed of a steel sheet having a predetermined thickness to a width corresponding to a flat portion of the floor slab 12 excluding the haunch. And a plurality of horizontal ribs 31C orthogonal to the bridge axis are provided at predetermined intervals in the bridge axis direction and are formed firmly, and the upper surface of the supporting steel plate 41A is The lower rib 12C is adhered to the lower surface of the printing plate 12 with an adhesive such as resin mortar, and the ends of the lateral ribs 31C are fastened to the abdominal plates 11w of the outer main girder 11A and the inner main girder 11B via brackets 33 with high strength bolts. It is worn and firmly installed. Note that the length of the under deck panel 31 in the bridge axis direction is set so as not to interfere with the anti-tilt structure 15.

The lower connection reinforcing panel 32 is made of a steel plate having a predetermined thickness and is formed of a lower flange 1A and an inner main girder 11B.
A plurality of longitudinal ribs 32B in the bridge axis direction are arranged at predetermined intervals in a direction perpendicular to the bridge axis on the upper surface side of the supporting steel sheet 32A formed to have a width capable of closing the gap between the bridge axes. The horizontal ribs 32C are arranged at predetermined intervals in the bridge axis direction, and are formed substantially vertically symmetrically with the under deck panel 31 described above. Then, the supporting steel plate 32A is connected to the main girders 11A, 1A.
The end of the lateral rib 32C is aligned with the lower flange 11b of the outer main girder 11A and the inner main girder 11B so as to correspond to the lower flange 11b.
1w is fastened by a high-strength bolt via a bracket 34 and is firmly installed. Thus, the lower connection reinforcing panel 32 is disposed so as to close a lower portion between the outer main girder 11A and the inner main girder 11B.

According to the central reinforcing structure 30 as described above, the under deck panel 31 reinforces the floor slab 12, and the lower connecting reinforcing panel 32 closes the lower part between the outer main girder 11A and the inner main girder 11B. By being connected and installed,
Floor slab 12 reinforced by underdeck panel 31
And the outer main girder 11A, the inner main girder 11B, and the lower connection reinforcing panel 32 form a closed cross-section to form a box girder, thereby improving rigidity. This can increase the load bearing capacity,
It is possible to cope with an increase in the dead load caused by the weight increase due to the constituent members of the central portion reinforcing structure 30 (that is, the under deck panel 31, the lower connection reinforcing panel 32) and the weight increase due to the side reinforcing structure 20 described above. Further, since the lower surface side of the floor slab 12 is covered with the lower connection reinforcing panel 32, the scenery (appearance) can be improved and the soundproof effect can be obtained.

Although the lower connection reinforcing panel 32 is formed of a steel plate in the above configuration example, the lower connection reinforcing panel 32 is not limited to this and may be formed of another material.

The under deck panel 31 in the central reinforcing structure 30 is not necessarily provided, and even if it is omitted, the effect of box girder can be obtained. But,
Providing this can increase the load resistance and improve the durability.

Further, in the side reinforcing structure 20, an under deck panel may be provided on the lower surface of the floor slab 12 protruding outside the outer main girder 11A to reinforce it.

[0030]

As described above, according to the reinforcing structure of a steel girder bridge for a concrete slab according to the present invention, the side reinforcing plate fixedly installed on the outer surface of the side edge convex portion of the reinforced concrete slab, A lower connecting reinforcing plate for connecting the side reinforcing plate and the steel main girder, and the lower connecting reinforcing plate is located apart from the lower surface of the reinforced concrete floor slab and the steel main girder and the reinforced concrete floor slab. Since the closed section is formed by the reinforced concrete floor slab, the lower connecting reinforcing plate, and the steel main girder by forming a closed section at the side, the side of the reinforced concrete floor slab is lateral to the steel main girder. The rigidity of the overhanging portion can be improved, and by supporting the side reinforcing plate that reinforces the side edge convex portion, it is possible to install a soundproof wall on the upper side and increase the height of the soundproof wall, and at the same time, reinforced concrete floor Side of plate overhang Surface portion can be improved landscape in order to be covered by the lower connection reinforcing plate, and has also soundproof.

Further, since the side reinforcing plate extends to a predetermined height to form a soundproof wall, the soundproof wall can be rationally formed.

Further, between the steel girders, a lower connecting reinforcing plate is fastened and fixed in an erected state with a predetermined distance from the lower surface of the reinforced concrete slab, and closed by the lower connecting reinforcing plate, the steel main girder and the reinforced concrete slab. By being configured to form a cross section, a box girder is formed by a lower connecting reinforcing plate, a steel main girder, and a reinforced concrete slab, which can increase the load capacity by improving rigidity and cope with an increase in weight due to reinforcement. I can do it. Further, since the lower connection reinforcing plate covers the lower surface side, the landscape can be improved, and the soundproof effect is also provided.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a RC slab steel girder bridge reinforced by applying an example of a reinforcing structure for a concrete slab steel girder bridge according to the present invention, and FIG. It is a cross-sectional view of RC floor slab steel girder bridge.

FIG. 2 is a partially enlarged sectional view of an RC floor slab steel girder bridge.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 10 RC Slab Steel Girder Bridge (Reinforced Concrete Slab Girder Bridge) 11 Main Girder (Steel Main Girder) 12 Floor Slab (Reinforced Concrete Slab) 12A Ground Cover (Side Edge Protrusion) 12B Wall Height Column (Side Edge Protrusion) 20) Side reinforcement structure 21A Outside plate (side reinforcement plate) 24 Soundproof wall 25 Bevel plate (lower side connection reinforcement plate) 30 Central reinforcement structure 32 Lower connection reinforcement panel (lower connection reinforcement plate)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mamoru Sugizaki 5-30-13 Toyo, Koto-ku, Tokyo F-term in Ismic Co., Ltd. 2D059 AA07 AA14 GG40 GG55

Claims (3)

[Claims] 1. A concrete deck slab girder bridge comprising a reinforced concrete slab supported by a steel main girder, a side reinforcing plate fixedly stretched on an outer surface of a side edge convex portion of the reinforced concrete slab, and And a lower connecting reinforcing plate for connecting the steel main girder with the steel main girder, wherein the lower connecting reinforcing plate is located apart from the lower surface of the reinforced concrete floor slab. A reinforcing structure for a steel girder bridge on a concrete floor slab, characterized in that it is configured to form a closed section with a reinforced concrete slab. 2. The reinforcing structure for a concrete floor slab steel girder bridge according to claim 1, wherein the side reinforcing plate extends to a predetermined height to form a soundproof wall. 3. A steel girder bridge for a concrete floor slab in which a reinforced concrete floor slab is supported by a steel main girder, wherein a lower connecting reinforcing plate is provided between the steel girder and a predetermined distance from a lower surface of the reinforced concrete floor slab. A reinforcing structure for a steel girder bridge for a concrete floor slab, which is fastened and fixed in an erected state and is configured to form a closed cross section by the lower connection reinforcing plate, the steel main girder, and the reinforced concrete slab.