JP2007277993A - Faceplate securing mechanism of expansion joint for bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a faceplate securing mechanism used for a slide plate expansion joint for bridge and capable of coping with the vertical displacement of the bridge girder. <P>SOLUTION: A fixed end as one end of a faceplate 11 bridged over an expansion gap is secured to an anchor plate 14A installed on one floor plate by a faceplate fixing mechanism 12. The faceplate fixing mechanism 12 comprises a tightening mechanism formed of a bolt 121 and a nut 126 and an elastic material 122 formed by stacking belleville springs on each other. The bolt 121 is inserted through the faceplate 11 and the anchor plate 14A. The elastic member 122 is interposed between the anchor plate 14A and the nut 126. The faceplate 11 is pressed against the anchor plate 14A. The elastic member 122 absorbs a load applied to the faceplate fixing mechanism 12 due to the displacement of the faceplate 11 at its free end in the vertical direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a telescopic device installed between bridges or between a bridge and an abutment. In particular, the present invention relates to a road bridge expansion joint and a face plate fixing mechanism using a slide plate type joint.

A slide plate type joint is known as one of expansion joints that complement the gap. A slide plate type joint has a plate-shaped face plate spanned between bridges or between bridges and abutments, and one end is fixed to one bridge using a fastening mechanism such as a bolt. Is the free end. Thereby, it is possible to cope with the horizontal displacement between play by sliding the free end of the face plate on the floor slab (Patent Document 1).
JP 2000-290914 A

  However, such a slide plate type joint can cope with horizontal displacement between play, but if there is a height difference between the beams due to bending or rotation of the bridge beam, the face plate Since the free end side is pushed up or is in a cantilever state, a large load is applied to the bolt attached to the fixed end side, which may be damaged.

  An object of the present invention is to obtain a face plate fixing mechanism that can cope with a vertical displacement of a bridge girder, and an expansion joint for a bridge using the face plate fixing mechanism.

  The face plate fixing mechanism of the present invention is a face plate fixing mechanism that is used in a slide plate type expansion joint for a bridge, and fixes a fixed end, which is one end of a face plate spanned between idle spaces, to one floor slab, The face plate fixing mechanism includes an elastic portion that absorbs a load due to a vertical displacement of a free end that is the other end of the face plate.

  When a load is applied to the free end and a displacement occurs at the position of the free end, the elastic portion displaces the face plate relative to the anchor member according to the displacement, and when the load on the free end is removed, Return the face plate to its original position.

  The face plate fixing mechanism includes a fastening mechanism that fastens the face plate to an anchor member provided on one floor slab, and the elastic portion biases the face plate toward the anchor member via the fastening mechanism. The fastening mechanism is composed of a bolt and a nut, the bolt is inserted between the face plate and the anchor member, the elastic part is interposed between the anchor member and the nut, and the bolt causes the face plate to be the anchor member by the urging force of the elastic part. Press.

  One floor slab is formed with a box for accommodating a nut and an elastic portion. In addition, a nut restricting means for restricting the rotation of the nut in the bolt axis direction in the box and making the nut movable in the bolt axis direction is provided. The nut regulating means is, for example, a square washer adapted to engage with the inner wall of the box and regulate rotation, and the square washer is fixed to the nut. Further, the elastic part is formed by stacking a plurality of elastic members, for example.

  The slide plate type expansion joint for bridge of the present invention is characterized by using the face plate fixing mechanism.

  As described above, according to the present invention, it is possible to obtain a face plate fixing mechanism capable of dealing with a vertical displacement of a bridge girder and a bridge expansion joint using the face plate fixing mechanism.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side cross-sectional view of a slide plate type expansion joint for a bridge (joint) according to an embodiment of the present invention installed between the bridges. FIG. 1 shows a state where the face plate is pushed up due to a difference in the height of the bridge girder.

  The joint 10 includes a face plate 11, and one end (the left end in FIG. 1) is fixed to the floor slab 13A of one bridge girder by the face plate fixing mechanism 12 of the present embodiment. An anchor plate 14A is provided on the floor slab 13A, and the anchor plate 14A is fixed to a reinforcing bar anchor 15A embedded in the floor slab 13A.

  The anchor plate 14A is a member having an L-shaped cross section, for example, and is attached to a corner of the end surface of the floor slab 13A that forms a gap with the top surface of the floor slab 13A on which the face plate 11 is provided. That is, the face plate 11 is fixed to the anchor plate 14A by the face plate fixing mechanism 12, and thereby fixed to the floor slab 13A.

  On the other hand, the floor slab 13B facing the floor slab 13A has an L-shaped cross section at the corner of the end face of the floor slab 13B that forms a gap with the top surface of the floor slab 13B, and the reinforcing bar anchor 15B embedded in the floor slab 13B. An anchor plate 14B that is fixed to is attached. A support plate 16 is placed on the top surface of the floor slab 13B, and one end thereof is fixed to the anchor plate 14B with a bolt. Further, the other end of the support plate 16 is fixed to, for example, a bolt fixed to the reinforcing bar anchor 15B. In addition, the water stop rubber 17 is arrange | positioned between play, and the water stop rubber 17 is attached to anchor plate 14A, 14B using fixing means, such as a volt | bolt.

  FIG. 1 shows a state in which the right bridge girder (floor slab 13B) is relatively lifted with respect to the left bridge girder (floor slab 13A) to which the face plate 11 is fixed. The face plate 11 is kept horizontally on the top surfaces of the floor slabs 13A and 13B, and the bottom surface of the free end side (right end side in FIG. 1) of the face plate 11 is placed on the support plate 16. The

  Since the face plate 11 and the support plate 16 are merely in contact with each other, the face plate 11 slides on the support plate 16 in accordance with the displacement when the gap between the play is displaced. Thereby, the joint 10 can respond to the displacement between horizontal play similarly to the conventional joint.

  On the other hand, as shown in FIG. 1, when the bridge end on the free end side of the face plate 11 is relatively high and the free end of the face plate 11 is lifted, or the bridge end on the free end side is relatively low and becomes a free end. When a load is applied, if the face plate 11 is fixed to the floor slab 13A so as not to move completely using bolts or the like as in the prior art, there is a possibility that a large load is applied to the bolt and breaks. In particular, when the clearance is large, it is necessary to use a steel plate having high rigidity for the face plate. Therefore, when the clearance is narrow, aluminum or the like is used for the face plate, and the load cannot be absorbed by the bending of the plate.

  In this embodiment, the face plate 11 is fixed to the floor slab 13A by the flexible face plate fixing mechanism 12 capable of adapting to the height displacement between the bridge girders, thereby causing an excessive load on the fixing mechanism. Prevents hanging. The configuration of the face plate fixing mechanism 12 of this embodiment will be described below with reference to FIGS.

  FIG. 2 is a schematic diagram for explaining the structure of the face plate fixing mechanism 12 of the present embodiment. The face plate fixing mechanism 12 includes, for example, a bolt 121 and a nut 126 screwed into the bolt 121 as a fastening mechanism. The bolt 121 is inserted into a mounting hole 121h provided in the face plate 11 and a mounting hole 141 provided in the anchor plate 14A, and the tip thereof is inserted into a box 123 formed in the floor slab 13A.

  The box 123 is formed in the floor slab 13A during concrete curing, and is formed by placing a rectangular parallelepiped formwork 124 in the floor slab 13A during concrete curing of the floor slab 13A. In the box 123, an elastic member 122, a square washer 125, and a nut (for example, a hexagon nut) 126 fixed to the elastic member 122 are installed in advance.

  The elastic member 122 is, for example, a plurality of disc springs (for example, six) that are alternately stacked, and the bolt 121 inserted into the box 123 passes through the central opening of each disc spring and is screwed into the nut 126. Combined. The square washer 125 engages with the inner wall of the box 123 in the box 123 to restrict the rotation of the nut 126. Accordingly, when the bolt 121 is rotated, the male screw of the bolt 121 is screwed with the female screw of the nut 126.

  When the nut 126 is moved in the head direction of the bolt 121 by the rotation of the bolt 121, the elastic member 122 is sandwiched and pressed between the square washer 125 and the anchor plate 14A. That is, the face plate 11 is pressed against the anchor plate 14A by the urging force of the elastic member 122 and fixed to the anchor plate 14A.

  The face plate 11 is formed with a recess for accommodating the head of the bolt 121. When the face plate 11 is fixed to the anchor plate 14 </ b> A by the bolt 121, the head is accommodated in the face plate 11. Further, the mounting hole 141 through which the bolt 121 provided in the anchor plate 14A is inserted is slightly larger than the thickness of the shaft of the bolt 121, and the shaft of the bolt 121 can be tilted in the mounting hole 141. .

  3 and 4 are enlarged side sectional views of the face plate fixing mechanism 12 of the present embodiment, and FIG. 3 shows a state in which the face plate 11 is maintained horizontal without a difference in height between bridge girders. On the other hand, FIG. 4 shows a state where the bridge plate on the free end side of the face plate 11 is higher than the bridge plate on the fixed end side, and the face plate 11 is tilted.

  As shown in FIG. 3, the normal face plate 11 is maintained in a horizontal state by the urging force of the elastic member 122 and is in close contact with the anchor plate 14A. On the other hand, when the free end side of the face plate 11 is lifted, the elastic member 122 is deformed, and the bolt 121 is slightly lifted and tilted with the displacement of the face plate 11.

  When the end beam on the free end side of the face plate 11 is lowered and a load is applied to the free end, the face plate 11 and the bolt 121 are inclined in the direction opposite to that in FIG. When the vertical displacement is eliminated and the load on the free end of the face plate 11 is removed, the face plate 11 is returned to the normal position by the restoring force of the elastic member 122.

  As described above, according to the face plate fixing mechanism of the present embodiment, since the face plate is fixed to the floor slab via the elastic member, the face plate follows the vertical displacement of the free end due to the deformation of the elastic member. Can be displaced. Thereby, it is possible to prevent an excessive force from being applied to the bolts and nuts used in the face plate fixing mechanism, and it is possible to prevent the fixing mechanism from being broken or prematurely damaged.

  5 to 8 show some of the elastic members 122 other than the disc springs. FIG. 5 shows a coil spring 20, and FIG. 6 shows a plurality of clip-shaped steel plates 21 stacked one on another. Further, FIG. 7 shows a case where several layers of elastomer material 22 are laminated, and FIG. 8 shows a case where a steel plate 23 is inserted between the laminated elastomer materials 22 shown in FIG.

  As described above, various objects can be used for the elastic member as long as they can be deformed corresponding to the displacement of the face plate and can flexibly fix the face plate to the anchor plate.

  Moreover, in the elastic member which piled up the disc spring, the clip-shaped steel plate, or the elastomer material, it can respond to various load conditions by adjusting the number to pile up. In this embodiment, the nut is fixed to the square washer by welding so that the rotation around the bolt axis is restricted while the nut is movable in the bolt axis direction (vertical direction) in the box. Any other configuration may be used as long as the configuration can freely move in the direction and regulate the rotation and can cope with the inclination of the bolt.

It is a sectional side view of the expansion joint for slide plate type bridges which is one Embodiment of this invention. It is a schematic diagram explaining the structure of the faceplate fixing mechanism of this embodiment. It is an expanded sectional side view of a faceplate fixing mechanism, and shows a state when there is no height difference between bridge girders and the faceplate is kept horizontal. FIG. 4 is an enlarged side sectional view of the face plate fixing mechanism, showing a state in which the bridge plate on the free end side of the face plate is higher than the bridge plate on the fixed end side and the face plate is tilted. It is a perspective view of the coil spring which is a modification of an elastic member. It is a perspective view of the elastic member which piled up a plurality of clip-shaped steel plates. It is a perspective view of the elastic member which laminated | stacked several layers of elastomer materials. It is a perspective view of the elastic member which inserted the steel plate between the laminated | stacked elastomer materials of FIG.

Explanation of symbols

10 Slide plate type expansion joint for bridge 11 Face plate 12 Face plate fixing mechanism 13A, 13B Floor slab 14A, 14B Anchor plate 16 Support plate 121 Bolt 122 Elastic member 123 Box 124 Form frame 125 Square washer 126 Nut

Claims (9)

A face plate fixing mechanism that is used in a slide plate type expansion joint for bridges and fixes a fixed end, which is one end of a face plate spanned between play blocks, to one floor slab,
The face plate fixing mechanism includes an elastic portion that absorbs a load caused by a displacement in a vertical direction of a free end that is the other end of the face plate.   When the load is applied to the free end and displacement occurs at the position of the free end, the elastic portion displaces the face plate with respect to the anchor member according to the displacement, and the load to the free end is 2. The face plate fixing mechanism according to claim 1, wherein when the face plate is removed, the face plate is returned to its original position.   The face plate fixing mechanism includes a fastening mechanism for fastening the face plate to an anchor member provided on the one floor slab, and the elastic portion directs the face plate toward the anchor member via the fastening mechanism. 2. The face plate fixing mechanism according to claim 1, wherein the face plate fixing mechanism is biased.   The fastening mechanism includes a bolt and a nut, the bolt passes through the face plate and the anchor member, the elastic part is interposed between the anchor member and the nut, and the biasing force of the elastic part The face plate fixing mechanism according to claim 3, wherein the bolt presses the face plate against the anchor member.   The face plate fixing mechanism according to claim 4, further comprising a box formed on the one floor slab that accommodates the nut and the elastic portion.   6. The face plate fixing mechanism according to claim 5, further comprising nut restricting means for restricting rotation of the nut in the box axial direction in the box and making the nut movable in the bolt axial direction. .   The face according to claim 6, wherein the nut regulating means is a square washer adapted to engage with an inner wall of the box and regulate the rotation, and the square washer is fixed to the nut. Plate fixing mechanism.   The face plate fixing mechanism according to claim 1, wherein the elastic portion is formed by stacking a plurality of elastic members.   A slide plate type expansion joint for bridges using the face plate fixing mechanism according to any one of claims 1 to 8.

Images