JPH06313305A - Jointless multiple span floor slab bridge - Google Patents

Abstract

PURPOSE:To provide a jointless multiple span floor slab bridge which can prevent a crack from occurring on an upper concrete face near the end of a steel beam even in the case where a motor-truck having goods heavier than design weight runs or extremly large axial force resulting from an earthquake acts. CONSTITUTION:In a jointless multiple span floor system bridge, an elastic sealing material is filled up in the upper part of a gap between floor slab bridges 2A, 2B, and a bituminous sheet 9 is spreadingly provided over the upper face of the upper flange of a steel beam 3 in the floor slab bridges 2A, 2B at least in a required section centering around the filled up portion of an elastic sealing material 8. A viscous elastic floor material 10 is placed on the bituminous sheet 9 instead of concrete 5.

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 Viaducts over multiple spans are often used for highways in urban areas to effectively use land and alleviate traffic congestion.

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

However, at each end of the simply supported composite slab bridge, expansion joints are provided for expansion and contraction due to temperature change of the composite slab bridge and rotation of the bridge end. Because of this expansion joint, when a freight car passes through a simply supported composite deck slab at high speed, vibration occurs, and this vibration becomes a source of noise, and due to water leakage from the expansion joint part, There was a problem that the corrosion of the steel girder end was promoted. As one means for solving this problem, Japanese Patent Laid-Open No. 2-16
There is a technique disclosed in Japanese Patent No. 4902. By adopting the technology disclosed in this publication, expansion joints are unnecessary, the above problems are prevented from occurring, and the concrete top surface can be used even when a freight vehicle with less than the design weight is run. Does not crack.

[0005]

By the way, even if the technique disclosed in the above-mentioned Japanese Patent Laid-Open is adopted, an abnormally large axial force acts due to running of a freight vehicle having a design weight or more or due to an earthquake or the like. In this case, a crack is generated on the concrete upper surface near the end of the steel girder, and the crack penetrates to the upper surface of the upper flange of the steel girder, which causes a step or a water leak.

[0006]

The present invention has been developed to solve the problem of the jointless multi-span slab bridge disclosed in the above-mentioned Japanese Patent Laid-Open Publication. The front deck slab has a projecting portion projecting in the longitudinal direction at the lower part of one end surface, and the projecting portion projecting in the longitudinal direction above the other end surface facing the one end surface of the front deck slab. Jointless multi-span floor consisting of a slab of a succeeding floor slab and a support means for supporting the lower surface of the protrusion of the slab of the succeeding portion on the upper surface of the projection of the front slab In the plate bridge, an elastic seal material is filled in the upper part of the gap with each of the deck bridges, and bitumen is spread over the upper flange upper surface of the steel girder in each of the floor bridges in at least a required section centered on the filled portion of the elastic seal material. A sheet is laid and the concrete is placed on this bituminous sheet. In the joint-less multi-span floor slab bridge was Da設 the viscoelastic flooring in place.

The second gist of the present invention is as follows.
A front deck slab having a projecting portion projecting in the longitudinal direction at the lower part of one end surface, and a trailing portion having a projecting portion projecting in the longitudinal direction above the other end surface facing one end surface of the front deck slab In the jointless multi-span slab bridge, which comprises a slab bridge and the upper surface of the protrusion of the front slab bridge, and a support means for supporting the lower surface of the protrusion of the subsequent slab bridge, An elastic member is fitted in the upper part of the space between the floor slabs, and wire mesh rebar is arranged over the upper flange of the steel girder in each floor bridge in at least a required section centered on the fitting portion of the elastic member. However, the jointless multi-span slab bridge is constructed by placing a viscoelastic floor material in place of concrete from the upper surface of the upper flange of the steel girder to a position above the wire mesh rebar.

[0008]

According to the jointless multi-span slab of the present invention, in the upper part of the gap between the front slab and the subsequent slab,
The upper flange upper surface of the steel girder in each floor slab in at least a required section centered on the filling portion of the elastic sealing material or the fitting portion of the elastic member by filling the elastic sealing material or fitting the elastic member Since, instead of concrete, a viscoelastic floor material was placed, the viscoelastic floor material is
Since it has a deformability against expansion and contraction, even if a large rotation occurs at each bridge deck end due to running of a freight vehicle with a design weight or more, or if an abnormally large axial force acts due to an earthquake, etc. No cracks occur in the viscoelastic floor material in the vicinity of the end portions of the respective deck slabs, and therefore, it is possible to prevent the conventional step difference and water leakage.

[0009]

FIG. 1 is a longitudinal sectional view of an essential part showing a first embodiment of the present invention. In FIG. 1, 1 is a pier and 2A is a front part of a jointless multi-span slab bridge. It is a slab bridge, and a projecting portion 2a projecting in the longitudinal direction is formed in the lower part of one end surface of the front slab bridge 2A.

2B is a succeeding floor slab adjacent to the front floor slab 2A, and is located above the other end of the succeeding floor slab 2B facing one end of the front floor slab 2A. Has a protruding portion 2b protruding in the longitudinal direction.

The floor slabs 2A and 2B are welded to each other between steel girders 3 having upper flanges 3a arranged in parallel in the width direction at regular intervals and the lower end surfaces of the webs 3b of the steel girders 3. It consists of a bottom plate 4 and concrete 5.

The lower surface of the projecting portion 2a of the front slab bridge 2A is supported via a moving lumber 6 on the pier 1, and the lower surface of the projecting portion 2b of the subsequent slab bridge 2B. Are supported via pin bearings 7 on the projections 2a of the front deck slab 2A.

Then, after filling an elastic seal material 8 as a joint material in the upper part of the gap between each of the deck slabs 2A and 2B, concrete 5 is placed up to the lower surface of the upper flange 3a of each steel girder 3, and then each A bituminous sheet 9 made of non-woven fabric or the like over the upper surface of the upper flange 3a of the steel girder 3 in the slab bridge 2A, 2B.
Is laid and, instead of the concrete 5, a viscoelastic floor material 10 such as tar-based asphalt or asphalt to which a rubber resin is added is placed on the bituminous sheet 9 or the elastic sealing material 8 is filled. Steel girders 3 excluding required sections centered on the part, for example, sections with a length of about 2 m
Place concrete 5 up above the upper flange 3a of
Next, the upper flange 3a of the steel girder 3 in each floor slab 2A, 2B in the required section centered on the filling portion of the elastic sealing material 8
A bituminous sheet 9 is laid over the upper surface of the above, a viscoelastic floor material 10 is cast on the bituminous sheet 9 to the same level as the cast concrete 5, and finally an asphalt pavement 11 is applied.

FIG. 2 is a vertical cross-sectional view of the main part showing the second embodiment of the present invention, in which the lower surface of the projecting portion 2a of the front deck slab 2A is provided with a rubber bearing 12 on the pier 1. The lower surface of the protruding portion 2b of the succeeding floor slab bridge 2B is
It is supported via a rubber bearing 13 on the protruding portion 2a of 2A.

After fitting a cap-shaped elastic member 14 made of rubber as a joint material to the upper part of the gap between the floor slabs 2A and 2B, concrete 5 is struck to the lower surface of the upper flange 3a of each steel girder 3. Installed, and then steel girders 3 on each deck slab 2A, 2B
A wire mesh rebar 15 such as expanded metal is arranged over the upper flange 3a of the wire rebar 15
Up to the position above, instead of concrete 5, viscoelastic flooring 10
Or the concrete 5 is cast up to the upper part of the upper flange 3a of each steel girder 3 except for a required section centered on the fitting portion of the cap-shaped elastic member 14, for example, a section of about 2 m in length. Then, over the upper flange 3a of the steel girder 3 in each floor slab 2A, 2B in the required section centered on the fitting portion of the cap-shaped elastic member 14, the wire mesh rebar 15
A viscoelastic flooring material 10 is cast on the same level as the cast concrete 5 up to the position above the wire mesh rebar 15, and finally asphalt pavement 11 is applied.

The cap-shaped elastic member 14 may have various sectional shapes as shown in FIG.

[0017]

According to the jointless multi-span slab of the present invention described above, an elastic sealing material is filled in the upper part of the gap between the front slab and the subsequent slab, Alternatively, by fitting the elastic member, over the upper flange upper surface of the steel girder in each floor slab of at least the required section centered on the filling portion of this elastic sealing material or the fitting portion of the elastic member,
Since a viscoelastic floor material was placed instead of concrete, the viscoelastic floor material has a deformability against expansion and contraction. Even if an abnormally large axial force is applied due to an earthquake or the like, the viscoelastic floor material near the end of each deck slab will not crack, and therefore there will be no difference in level or water. Leakage can be prevented.

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

FIG. 3 is a cross-sectional view showing various shapes of a cap-shaped elastic member used in the second embodiment.

[Explanation of symbols]

 1 ... Pier 2A ... Front deck slab 2a ... Projection 2B ... Rear deck slab 2b ... Projection 3 ... Steel girder 3a ... Top flange 3b ... Web 4 ... Bottom plate 5 ... Concrete 6 ... Moving sludge 7 ... Pin bearing 8 ... Elastic sealing material 9 ... Bituminous sheet 10 ... Viscoelastic floor material 11 ... Asphalt pavement 12, 13 ... Rubber bearing 14 ... Cap-shaped elastic member 15 ... Wire mesh rebar

Claims (2)

[Claims] 1. A front deck slab having a projecting portion projecting in the longitudinal direction at the lower part of one end face, and a projecting protrusion projecting in the longitudinal direction above the other end face facing one end face of the front deck slab. Jointless multispan consisting of a succeeding floor slab bridge having a section and a support means for supporting the lower surface of the projecting portion of the succeeding floor slab on the upper surface of the projecting portion of the front slab bridge In the slab bridge, an elastic sealing material is filled in the upper part of the space between the slab bridges, and at least a required section centered on the filled portion of the elastic sealing material is spread over the upper flange upper surface of the steel girder in each slab bridge. A jointless multi-span slab characterized by laying a bituminous sheet and placing a viscoelastic floor material instead of concrete on the bituminous sheet. 2. A front deck slab having a projecting portion projecting in the longitudinal direction at the lower part of one end surface, and a projecting protrusion projecting in the longitudinal direction above the other end surface facing one end surface of the front deck slab. Jointless multispan consisting of a succeeding floor slab bridge having a section and a support means for supporting the lower surface of the projecting portion of the succeeding floor slab on the upper surface of the projecting portion of the front slab bridge In the slab bridge, an elastic member is fitted in the upper part of the gap with each of the slab bridges, and gold is spread over the upper flange of the steel girder in each of the floor bridges in at least a required section centered on the fitting part of the elastic member. A jointless multi-span slab bridge in which reticulated reinforcing bars are arranged, and a viscoelastic floor material is placed in place of concrete from the upper flange upper surface of the steel girder to a position above the wire reticulated reinforcing bars.