JP4689371B2 - Bridge expansion joint - Google Patents

Description

  The present invention relates to a telescopic device installed between bridge girders. In particular, the present invention relates to an expansion joint to which a gap provided between bridge girders of a road bridge can be attached.

A finger joint using a steel finger plate is known as one of the expansion joints that complement the gap. A finger joint is a pair of sawtooth fingers facing each other with a certain gap, and this gap absorbs expansion and contraction due to the temperature difference of the bridge girder, vibration during vehicle travel, or height difference between the joints. ing. However, in the finger joint, water leakage occurs and the undercarriage environment is deteriorated, and noise is generated during traveling of the vehicle to deteriorate the ride comfort. For such a problem, an expansion joint has been proposed in which the upper part of the finger plate is covered with an elastic body made of rubber or the like (Patent Document 1).
Japanese Utility Model Publication No. 2-31351

  However, the configuration using the finger joint has a problem that it is restricted with respect to the movement in the direction perpendicular to the bridge axis, and also has a problem that the size of the elastic joint portion becomes large. To deal with such a problem, it is conceivable to make a large gap between the fingers. However, if the gap is made large, there arises a problem that the load holding force is reduced and the size of the joint portion is also increased.

  An object of the present invention is to provide a bridge expansion joint that is compact but exhibits sufficient tolerance for movement in the lateral direction (the direction perpendicular to the bridge axis) and is applicable to a wide gap.

  The bridge expansion joint of the present invention is a bridge expansion joint that is mounted between the ends of the bridge girder and is fixed to each bridge girder end, and has a projecting portion that projects from the bridge girder end to the gap. It is characterized by comprising an overhang member, a load support member that is spanned between the overhang portions and supported by the overhang portions, and elastic deformation means that absorbs a relative position change between the bridge girder ends. .

  The elastic deformation means includes a shear layer made of an elastic member, and the shear layer is provided between each of the overhang portions and the load support member. The load support member is embedded in the elastic member, and the elastic member that embeds the load support member is formed integrally with the elastic member of the shear layer.

  As described above, according to the present invention, it is possible to provide a bridge expansion joint that is compact but exhibits sufficient tolerance for movement in the lateral direction (perpendicular to the bridge axis) and is applicable to a wide gap. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a bridge expansion joint according to an embodiment of the present invention, and FIG. 2 is a plan view of the bridge expansion joint shown in FIG. 1 is a cross-sectional view taken along the line II of FIG. 3 and 4 are a side sectional view and a plan view showing a state in which the bridge expansion joint of the present embodiment is attached to the bridge girder gap portion, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG.

  As shown in FIGS. 1 and 2, the bridge expansion joint 10 of this embodiment is generally composed of a joint portion 11, a pair of loosely extending members 12A and 12B, and a large number of anchor plates 13A and 13B. . The joint part 11 is located in the approximate center of the bridge expansion joint 10 and extends in the lateral direction (corresponding to the width direction of the bridge). The loose projecting members 12A and 12B are arranged at a predetermined distance d from each other, extend parallel to the joint portion 11, and are connected to each other by the joint portion 11 that spans the distance d. The anchor plates 13A and 13B extend at predetermined intervals from the gap extending portions 12A and 12B toward the outer side of the bridge beam axis direction. In FIG. 1, the structure of the bridge expansion joint 10 is symmetrical.

  The loose extension members 12A and 12B are made of T-shaped steel having a substantially T-shaped cross-sectional shape. The upper surface of the flange portion of the T-shaped steel used for the loose projecting members 12A and 12B is covered with an elastic member 14 such as rubber. Grooves 15 </ b> A and 15 </ b> B extending in the lateral direction along both sides are formed in the elastic member 14, and these grooves 15 </ b> A and 15 </ b> B define the joint portion 11 at the center of the bridge expansion joint 10. A groove 16 extending along the longitudinal direction of the bridge expansion joint 10 is formed at the lower center of the elastic member 14. That is, the region sandwiched between the grooves 15A and 15B of the elastic member 14 has a cross-sectional shape with a substantially U-shaped shape. The width of the groove 16 is substantially equal to the distance d between the loose projecting members 12A and 12B.

The elastic member 14 may be, for example, chloroprene rubber having physical properties of a hardness of 45-60 in JIS K 6253 durometer hardness test type A; a tensile strength of 15 N / mm ² or more and an elongation of 300% or more in JIS K 6251. Is suitable.

  The joint portion 11 has a structure in which a load support plate 17 made of, for example, a steel plate is embedded in the elastic member 14, and in this embodiment, both ends of the joint portion 11 form upper portions on the shear layers 18A and 18B, respectively. The plate 17 is supported by shear layers 18A, 18B. That is, the load support plate 17 extends over substantially the entire width of the joint portion 11, and the width is larger than the distance d between the loosely extending members 12 </ b> A and 12 </ b> B.

  The shear layers 18A and 18B are a part of the elastic member 14, and are formed integrally with the joint portion 11, and the internal steel plates 19A and 19B are embedded horizontally in the shear layers 18A and 18B, respectively. In addition, the bottom surface of the elastic member 14 including the bottom surfaces of the shear layers 18A and 18B is bonded (for example, vulcanized) to the top surfaces of the loose projecting members 12A and 12B. In addition, plate members 20A and 20B extending along the longitudinal direction of the loosely extending members 12A and 12B are respectively attached vertically from the upper surface outside of the loosely extending members 12A and 12B. The elastic member 14 is embedded in the regions 21A and 21B outside the grooves 15A and 15B.

  The anchor plate 13A has two openings 22A, and the anchor plate 13B has two openings 22B. These openings 22A and 22B are used when the bridge expansion joint 10 is attached as described below.

  As shown in FIG. 3, the bridge girders 30 </ b> A and 30 </ b> B include floor slabs 31 </ b> A and 31 </ b> B made of, for example, reinforced concrete, and asphalt pavements 32 </ b> A and 32 </ b> B, for example. Further, a gap with a width D is provided between the end portions of the floor slabs 31A and 31B.

  The loosely extending members 12A and 12B are arranged such that the stiffening plates extending vertically from the bottom surface of the flange portion of the T-shaped steel have the same distance as the loose width D. The bridge expansion joint 10 is installed in box opening portions 33A and 33B formed on the upper surfaces of the end portions of the floor slabs 31A and 31B. At this time, the bridge expansion joint 10 is positioned such that the opposing surfaces of the stiffening plate coincide with the end surfaces of the floor slabs 31A and 31B and the upper surface of the joint portion 11 coincides with the pavement surface. That is, one of the flange portions of the loosely projecting members 12A and 12B supports the both ends of the load support plate 17 via the loosely stretched (projected portions) and the shear layers 18A and 18B, respectively.

  Anchors 34A and 34B embedded in the concrete of the floor slabs 31A and 31B project from the floor surfaces of the box opening portions 33A and 33B, respectively. Reinforcing bars 35A and 35B extending along the lateral direction are passed through the openings 22A and 22B of the anchor plates 13A and 13B, respectively, and are welded to the edges of the openings 22A and 22B. The reinforcing bars 35A and 35B are welded to the anchors 34A and 34B, respectively. Thereby, the bridge expansion joint 10 is fixed to the bridge beams 30A and 30B adjacent to each other with a gap. After that, post-cast concrete is poured into the box opening portions 33A and 33B to the pavement surface, and the installation of the bridge expansion joint 10 is finished.

  Thus, the gap provided between the bridge girders 30A and 30B is covered by the bridge expansion joint 10, and the load from the vehicle or the like in the gap is caused by the load support plate 17 of the joint portion 11 and the gap extension member 12A that supports this. 12B. Further, the change in the gap width D due to the expansion and contraction of the bridge girders 30A and 30B or the relative movement in the lateral direction between the bridge girders 30A and 30B causes the elasticity of the shear layers 18A and 18B made of the elastic member 14 and the grooves 15A and 15B. Absorbed by deformation. The deformation of the shear layers 18A and 18B is mainly shear deformation. At this time, a change in the relative position of the load support plate 17 with respect to the loosely extending members 12A and 12B is realized by deformation of the shear layers 18A and 18B.

  As described above, in the present embodiment, the two loosely projecting members are respectively projected into the loose spaces, and the load supporting plate is supported by the projecting portions. Therefore, according to the present embodiment, the gap width can be substantially reduced with respect to the joint portion by the amount by which the gap protrusion member protrudes. As a result, the width of the load support plate can be reduced and the thickness can be reduced, and the bridge expansion joint can be reduced in weight and size. Further, by using the bridge expansion joint of the present embodiment, it is possible to set a wide gap.

  In this embodiment, since the shear layer is provided between the load support plate and the free-hanging portion and plays a role as a support, it is not necessary to provide a slide surface for the load support plate, and the shear layer is not provided. The width for providing can also be saved. Therefore, in this embodiment, the bridge expansion joint can be made more compact. In addition, according to the configuration of the present embodiment, the relative movement in the lateral direction between the bridge girders like a finger joint is not restricted as long as it is within the movable range of the joint of the elastic member. It can also handle movement in the direction perpendicular to the bridge axis.

  Furthermore, in this embodiment, since the elastic member which comprises a shear layer is adhere | attached (vulcanization adhesion) on the loose extension member, it is not necessary to fix an elastic member to the loose extension member using a volt | bolt or a nut. . As a result, the product width can be reduced by about 150 mm compared to the case where bolts and nuts are used, noise during vehicle passage is reduced, and traveling performance is improved.

It is a sectional side view along the II line of FIG. 2 of the bridge expansion joint which is one Embodiment of this invention. It is a top view of the bridge expansion joint shown by FIG. It is a sectional side view along the III-III line of Drawing 4 showing the state where the bridge expansion joint of this embodiment was attached to the bridge girder gap part. It is a top view which shows the state in which the bridge expansion joint of this embodiment was attached to the bridge girder gap part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bridge expansion joint 11 Joint part 12A, 12B Slack extension member 13A, 13B Anchor plate 14 Elastic member 15A, 15B Groove 18A, 18B Shear layer 19A, 19B Internal steel plate

Claims (5)

A bridge expansion joint attached between the ends of the bridge girder,
At the time of attachment, a loose projecting member that is fixed to each bridge girder end and has a projecting portion that projects from each of the bridge girder ends.
A load support member spanned between the overhang portions and supported by the overhang portions;
Elastic deformation means for absorbing a relative position change between the bridge girder ends having a shear layer made of an elastic member provided between the overhanging portion and the load supporting member ;
The loose projecting member is made of T-shaped steel extending in the bridge width direction, and the bottom surface of the shear layer is directly bonded to the upper surface of the flange portion of the T-shaped steel corresponding to the T-shaped horizontal bar. A stiffening plate corresponding to a steel T-shaped vertical bar forms a part of the bridge girder end surface, and the flange portion extending from the stiffening plate to the idler side constitutes the overhanging portion. Bridge expansion joint. The bridge expansion joint according to claim 1 , wherein the load supporting member is embedded in an elastic member, and the elastic member embedding the load supporting member is formed integrally with the elastic member of the shear layer. The bridge expansion joint includes an anchor plate that extends in the bridge girder axial direction from the idle projecting member and is fixed to the bridge girder end, and the anchor plate is formed in a box opening formed on the upper surface of the bridge girder end. The bridge expansion joint according to claim 1, wherein the bridge expansion joint is fixed and arranged, and the loose projecting member is fixed to the bridge girder end portion through the anchor plate. A plate material embedded in the elastic member is vertically provided on the upper surface of the flange portion opposite to the overhang portion, and extends in the bridge width direction between the region where the plate material is embedded and the shear layer. The bridge expansion joint according to claim 3, wherein an existing groove is provided. The bridge expansion joint according to claim 4, wherein a steel plate is horizontally arranged and embedded in the shear layer.

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