JPH06313306A - Jointless multiple span floor slab bridge - Google Patents

Abstract

PURPOSE:To dispense with an expansion joint in a multiple span floor slab bridge, and to continuously provide a floor slab concrete and an asphalt pavement over the whole length of the multiple span floor system bridge. CONSTITUTION:In a multiple span floor slab bridge where a floor system bridge composed of an end part concrete 15 and a floor slab concrete 8 which are placed on a steel beam 4 and the upper face of the bottom plate 4c of the steel beam 4 and united with the steel beam 4 is supported on a bridge pier 1 in every span, hard rubber supports 2, 3 are severally used for the fixed and the movable shoe of the adjacent floor slab bridge supported on a common bridge pier 1. The opposite end parts of the adjacent floor slab bridges are mutually joined through a connecting arm 6 with pin bolts 9. the floor slab concrete 13 is placed over the mutual upper faces of the upper flanges 4a of the steel beams 4 at the the adjacent floor slab bridge ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jointless multi-span slab bridge.

[0002]

2. Description of the Related Art In many cases, viaducts over multiple spans are often used for highways in urban areas in order to effectively use land and alleviate traffic congestion.

As one of the forms of the above-mentioned viaduct, a multi-span simple support composite in which synthetic slab bridges supported by each span and having a concrete floor slab provided on the upper surface of a steel girder are arranged in the longitudinal direction thereof. There is a version bridge. As one of the simply supported composite floor bridges, there is a so-called hollow composite floor bridge as disclosed in Japanese Examined Patent Publication No. 3-48285. This hollow type composite slab bridge has many excellent functions such as low girder height and wide applicable span, so it is widely used for bridge replacement.

[0004]

By the way, in the composite deck slab disclosed in the above-mentioned patent publication, expansion and contraction of the composite deck slab due to temperature change and rotation of each end portion by an automatic vehicle load are made compatible. Therefore, expansion joints are required at the ends of the composite deck slab for each span. Since the vehicle transport load is directly applied to this expansion joint, shocks and vibrations are generated by the car traveling on the composite deck slab, which is a source of noise, and water leakage from the expansion joint causes There was a problem that corrosion of the girder end was promoted and maintenance was required.

[0005]

The present invention was developed in order to solve the problems of the conventional multi-span slab bridge, and the first gist thereof is a steel girder, In a multi-span slab bridge in which each floor span is supported by a slab bridge made of concrete integrated with the steel girder, which is placed on the upper surface of this steel girder bottom plate, Hard rubber bearings are used for the fixed and moving troughs of the adjacent floor slabs to be supported, and the opposite ends of the adjacent floor slabs are pin-coupled to each other, and the upper flange upper surface of the steel girders of the adjacent floor slab bridges are mutually extended Located on a jointless multi-span slab bridge with slab concrete.

The second gist of the present invention is as follows.
Common for multi-span slab bridges in which a steel girder and a deck slab composed of steel girder bottom plate and concrete integrated with the steel girder are supported on piers for each span. Hard rubber bearings are used for the fixed and moving gears of the adjacent deck slab supported on the bridge pier, and the opposite ends of the adjacent deck slabs are joined together with PC steel rods through the concave and convex spherical seats. It is a jointless multi-span slab bridge in which slab concrete is cast across the upper flanges of the steel girders at the ends of adjacent slab bridges.

[0007]

According to the jointless multi-span slab of the present invention, the expansion of each slab due to temperature changes is resisted by the pin joints or the PC steel rod joints via the uneven spherical seats. However, since the deformation of each slab due to this resistance force can be absorbed by the shear deformation of the hard rubber bearing, expansion joints are not required and the slab concrete is made to continue over the entire length of the multi-span slab bridge. be able to.

Further, by replacing the slab concrete extending between the ends of the adjacent slab bridges with a viscoelastic floor material, the deformability of each slab bridge with respect to expansion and contraction can be further increased.

Further, by making the supporting position of each deck slab bridge end by the hard rubber bearing higher than the center of gravity of each deck slab bridge, elongation of the bottom plate of the steel girder that occurs during rotation of each deck slab bridge end. The amount can be reduced.

[0010]

FIG. 1 is a longitudinal sectional view of an essential part showing a first embodiment of the present invention, and FIG. 2 is a plan sectional view taken along the line AA of FIG. , A hard rubber bearing 2 as a fixed shoe and a hard rubber bearing 3 as a moving shoe are installed,
One end of the steel girder 4 in the front deck slab is placed on the hard rubber bearing 2 as the fixed shoe, and the succeeding portion adjacent to the front deck slab is placed on the hard rubber bearing 3 as the moving shoe. The other end of the steel girder 4 in the floor slab is placed.

Each of the steel girders 4 has an upper flange 4a, a web 4b, a bottom plate 4c and an end plate 4d, and the upper flange 4a, the web 4b and the bottom plate are located inside the end plate 4d. A stiffening member 5 welded to 4c is provided, and a connecting arm 6 is welded to each end of the web 4b of each steel girder 4.

After the foamed resin plate 7 is filled in the hollow portion, the end concrete 15 excluding the end of the upper flange 4a of each steel girder 4 and the floor slab concrete 8 are placed, and then each steel girder is placed. 4, the connecting arms 6 are connected to each other by a pin bolt 9 and a nut 10, and the upper flange 4a of each steel girder 4 is connected.
A concrete receiving member 11 made of, for example, a stainless steel plate, rubber, a bituminous sheet, or a foamed resin plate is fitted in the gap between the above and above the concrete receiving member 11.
For example, after arranging the wire mesh rebar 12 such as expanded metal, the floor slab concrete 13 is cast to the same level as the floor slab concrete 8 that has been cast, across the upper surfaces of the end portions of the upper flanges 4a of the steel girders 4. Finally, the asphalt pavement 14 is continuously applied over the entire length of the multi-span slab bridge.

The concrete receiving member 11 may have various cross-sectional shapes as shown in FIG. 3, and the post-cast floor slab concrete 13 may be, for example, tar-based asphalt or rubber. It may be replaced with a viscoelastic floor material such as asphalt to which a resin is added.

FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the present invention, and FIG. 5 is a plan sectional view taken along the line AA in FIG. 4, showing a common pier 1 A hard rubber bearing 2 as a fixed shoe and a hard rubber bearing 3 as a movable shoe are installed, and one end of each steel girder 4 arranged in parallel in the front deck slab is placed on the hard rubber bearing 2 as a fixed shoe. Then, the other end of each of the steel girders 4 arranged in parallel in the succeeding floor slab adjacent to the front floor slab is placed on the hard rubber support 3 as a moving shoe.

However, after the foamed resin plate 7 is filled in the hollow portion, in the space formed by the foamed resin plate 7, the bottom plate 4c and the end plate 4d, end concrete up to the same level as the foamed resin plate 7 is formed. After placing 15 and hardening the end concrete 15, the end plates 4d, which are centrally located with the webs 4b of the steel girders 4 arranged side by side in each deck slab, are provided in advance on the respective upper facing surfaces. PC through the central holes of the concave spherical seat 16 and the convex spherical seat 17 and the through holes of the concrete 15 at each end.
A steel rod 18 is inserted, and nuts 21 are loosely tightened at both ends of the PC steel rod 18 via bearing steel plates 19 and hard rubber pads 20, respectively, to connect the opposite ends of each floor slab to each other, and After fitting the concrete receiving member 11 in the gap between the upper flange 4a at the opposite end of the slab bridge and disposing the wire mesh rebar 12 above the concrete receiving member 11, the multi-span slab bridge Floor slab concrete 8 is continuously cast to a position above the upper flange 4a of the steel girder 4 over the entire length, and finally asphalt pavement 14 is continuously applied over the entire length of the multi-span slab bridge.

In the slab concrete 8 extending over the entire length of the multi-span slab bridge, viscoelastic floor materials may be used between the upper flange upper surfaces of the steel girders 4 at the ends of the adjacent slab bridges.

FIG. 6 is a vertical cross-sectional view of an essential part showing a third embodiment of the present invention, in which a hard rubber bearing 2 serving as a fixed shoe and a hard rubber bearing 3 serving as a moving shoe on a common pier 1. The height from the upper flange 4a of the web 4b at one end of the steel girder 4 in the front deck slab and the upper part of the web 4b at the other end of the steel girder 4 in the succeeding deck slab Flange
The height from 4a is set to about 1/2 of the height of the web 4b at the center of each steel girder 4. In other words, hard rubber bearings 2, 3
The steel girder 4 generated when the end of each deck slab is rotated by setting the support position of each deck slab end by the higher than the center of gravity of each deck slab.
The amount of extension of the lower flange 4c of is reduced. Although the third embodiment is applied to the first embodiment, the second embodiment
Of course, it can be applied to the embodiment. Further, floor slab concrete 8 in each example, post-cast slab concrete
13. As the end concrete 15, it is preferable to use expansive concrete in which expansive cement admixture is added to the mix of ordinary concrete for the purpose of preventing cracking due to drying shrinkage of concrete.

[0018]

According to the jointless multi-span slab according to the present invention described above, the expansion and contraction of each slab due to temperature change can be achieved through the PC through the pin joint or the concave and convex spherical seat.
The steel rod joint resists, and the deformation of each slab bridge due to this resistance force can be absorbed by the shear deformation of the hard rubber bearings, so expansion joints are not required, and the slab concrete is used for multi-span slabs. It can be continuous over the entire length of the bridge.

Further, by replacing the slab concrete extending between the ends of the adjacent slab bridges with a viscoelastic floor material, the deformability of each slab bridge against expansion and contraction can be further increased.

Further, by making the supporting position of each deck slab bridge end by the hard rubber bearing higher than the center of gravity of each deck slab bridge, the elongation of the bottom plate of the steel girder that occurs during the rotation of each deck slab bridge end. The amount can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a first embodiment of the present invention.

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

FIG. 3 is a cross-sectional view showing various shapes of a concrete receiving member.

FIG. 4 is a vertical cross-sectional view of a main part showing a second embodiment of the present invention.

5 is a plan sectional view taken along the line AA of FIG.

FIG. 6 is a vertical cross-sectional view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

1 ... Bridge pier 2 ... Hard rubber bearing as fixed shoe 3 ... Hard rubber bearing as moving shoe 4 ... Steel girder 4a ... Top flange 4b ... Web 4c ... Bottom plate 4d ... End plate 5 ... Stiffener 6 ... Connecting arm 7 … Foamed resin plate 8… Floor concrete 9… Pin bolt 10… Nut 11… Concrete receiving member 12… Wire mesh rebar 13… Post-cast floor concrete 14… Asphalt pavement 15 End concrete 16… Concave spherical seat 17… Convex Spherical seat 18 ... PC steel rod 19 ... Bearing steel plate 20 ... Hard rubber pad 21 ... Nut

Claims (5)

[Claims] 1. A multi-span floor in which a slab bridge composed of steel girders and concrete integrated with steel girders, which is cast on the upper surface of the steel girder bottom plate, is supported on piers for each span. In the version bridge, hard rubber bearings are used for the fixed and moving gears of the adjacent deck slabs supported on the common pier, and the opposite ends of the adjacent deck slabs are pin-connected to each other and the ends of the adjacent deck slabs are connected. Jointless multi-span slab bridge, characterized in that slab concrete was placed across the upper flanges of the steel girders of. 2. A multi-span floor in which a slab bridge composed of steel girders and concrete integrated with steel girders placed on the upper surface of the steel girder bottom plate is supported on piers for each span. In the plate bridge, hard rubber bearings are used for the fixed and moving wheels of the adjacent floor slabs supported on the common pier, and the opposite ends of the adjacent floor slabs are connected to the PC steel bar through the uneven spherical seat. The jointless multi-span slab bridge is characterized in that the slab concrete is placed over the upper flange upper surfaces of the steel girders at the ends of the adjacent slab bridges. 3. The jointless multi-span slab according to claim 1, wherein the slab concrete covering the upper flange upper surfaces of the steel girders at the ends of the adjacent slab bridges is replaced with a viscoelastic floor material. bridge. 4. The jointless multi-span slab according to claim 2, wherein the slab concrete covering the upper flange upper surfaces of the steel girders at the ends of the adjacent slab bridges is replaced with a viscoelastic floor material. bridge. 5. The support position of each deck slab bridge end portion by the hard rubber bearing is set higher than the center of gravity of each deck slab bridge, claim 1, claim 2, claim 3, claim 3. Item 4. The jointless multi-span slab bridge according to Item 4.