JP4953460B2 - One-way movable bearing device for bridges - Google Patents

Description

  The present invention relates to a movable support device for a bridge, and more particularly to an improvement of a one-way movable support device for a bridge that allows a bridge girder to move in the direction of the bridge axis and restricts the movement in a direction perpendicular to the bridge girder. is there.

  The bridge girder of the bridge undergoes expansion and contraction in the girder direction (bridge axis direction) due to changes in temperature. Therefore, in the construction of a bridge girder, a movable support device for a bridge having a mechanism that allows the movement of the bridge girder in the direction of the bridge axis and restricts the movement in a direction perpendicular thereto has been widely used.

According to this, both side surfaces in a direction perpendicular to the bridge axis of the upper bridge member fixed to the upper part of the rubber bearing body fixed to the lower structure side of the bridge are used as the lower bridge member fixed to the lower structure. This was abutted against a fixed side block, thereby allowing the bridge girder to move in the direction of the bridge axis and restricting movement in a direction perpendicular to the bridge girder (see, for example, Patent Document 1).
JP 2005-207020 A

  However, in the conventional movable support device for bridges, the side block must be fixed to the lower structure side in order to limit the movement in the direction perpendicular to the bridge axis. There arises a problem that the degree of freedom of arrangement of the support structure is limited.

  An object of the present invention is to provide a one-way movable bearing device for a bridge that solves the problems of the prior art, has a simple structure, can save installation space, and is durable.

  In order to solve the above-mentioned problem, the first invention of the present invention is a one-way movable bearing device for a bridge, in which a slide plate is formed which is fixed to one side of the upper and lower structure and has an elongated hole extending in the bridge axis direction. A shear restraining member having one end fixed to the other side and penetrating the elongated hole; a side portion fitted to the shear restraining member so as to be vertically movable; and abutting against an inner peripheral surface of the elongated hole; and a width of the elongated hole A movable block having a wide flange portion, and a ring nut screwed to the other end of the shear restraining member are provided.

  According to the second aspect of the present invention, in the one-way movable bearing device for a bridge according to the first aspect of the present invention, an elastic bearing is disposed on one side of the upper and lower structures, and the shear restraining member is disposed through the elastic bearing. It is a thing.

  According to a third aspect of the present invention, in the one-way movable bearing device for a bridge according to the first or second aspect of the present invention, a predetermined gap is formed between the flange portion of the movable block and the ring nut.

  According to a fourth aspect of the present invention, in the one-way movable bearing device for a bridge according to any one of the first to third aspects of the present invention, a step portion is formed on an inner peripheral portion of the elongated hole, and the step portion and the flange of the movable block The parts are engaged.

  The fifth aspect of the present invention is the unidirectional movable bearing device for a bridge according to any one of the first to fourth aspects of the present invention, wherein a ring-shaped rib is erected on the outer periphery of the long hole formed in the slide plate. A member in which a long hole for shear restraint that engages with the outer surface of the ring-shaped rib is formed on the fixed side is arranged.

In the one-way movable bearing device for a bridge according to the present invention, a slide plate formed with a long hole fixed to one side of the vertical structure and extending in the direction of the bridge axis, and one end fixed to the other side of the vertical structure, the long hole A movable block having a shearing restraining member penetrating through, a side portion that is fitted to the shearing restraining member so as to be movable up and down, and that is in contact with an inner peripheral surface of the elongated hole, and a flange portion that is wider than a width of the elongated hole, Since the configuration includes a ring nut that is screwed to the other end of the shear restraining member, the shear restraining member that penetrates the long hole of the slide plate with respect to the horizontal force in the direction perpendicular to the bridge axis can be used. Can be saved, and the degree of freedom of arrangement of members can be secured. At that time, the horizontal force in the direction perpendicular to the bridge axis from the superstructure is not directly applied to the shear restraint member, but is equal to the shear restraint member via the surface contact portion with the movable block fitted to the shear restraint member. Therefore, the stress is not concentrated on a part of the shear restraining member, and the diameter of the shear restraining member can be reduced. Moreover, it respond | corresponds with the slide which used the movable block of the slide plate as a guide to the horizontal force of a bridge axis direction. At that time, the movable block bears the frictional force accompanying the slide, the load due to the frictional force of the shearing restraint member can be eliminated, and the life of the shearing restraint member can be extended. Furthermore, the lifting force can be dealt with by engagement between the flange portion of the movable block and the slide plate whose movement in the vertical direction is restricted by the ring nut.
An elastic bearing is disposed on one side of the upper and lower structures, and the shear key is disposed through the elastic bearing, whereby the horizontal force in the direction perpendicular to the bridge axis transmitted to the shear restraining member is elastically supported. Can be absorbed by shear deformation.
With a configuration in which a predetermined interval is formed between the flange portion of the movable block and the ring nut, it is possible to cope with the rotational force of the upper structure.
By forming a step portion on the inner periphery of the elongated hole and engaging the flange portion of the movable block with the step portion, between the flange portion surface of the movable block and the ring nut screwed to the upper end of the shear restraint member Can be ensured.
A ring-shaped rib is provided on the outer periphery of the long hole formed in the slide plate, and a long hole for shear restraint extending in the direction of the bridge axis contacting the outer surface of the ring-shaped rib is formed on the side of the structure for fixing the slide plate. With this configuration, the ring-shaped rib functions as a shear key for horizontal force in the direction perpendicular to the bridge axis, and has the function of transmitting the horizontal force in the direction perpendicular to the bridge axis to the substructure in the order of the slide plate, movable block, and shear restraint member. The thickness of the slide plate can be reduced.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a unidirectional movable bearing device for a bridge according to the present invention.

  The one-way movable bearing device 1 for a bridge is installed between a concrete lower structure 2 such as a pier and an upper structure 3 made of a steel girder. A lower collar 4 is fixed to the lower structure 2 by anchor bolts 5.

  A shear restraining member 9 having one end fixed to the lower rod 4 is vertically erected upward. The shear restraining member 9 is fixed to the lower collar 4 by screwing or welding.

  On the other hand, the upper rod 10 is fixed to the upper structure 3 made of steel girders by welding in advance. The slide plate 11 is fixed to the upper collar 10 and the upper structure 3 by a plurality of set bolts 12.

  2 and 3 are views showing the slide plate 11. The lower surface of the slide plate 11 forms a slide surface with the surface of the lower collar 4. At the four corners of the slide plate 11, female bolt holes 13 for set bolts to which set bolts 12 are screwed for fixing to the upper structure 3 and the upper shoe 10 are formed. A long hole 14 extending in the bridge axis direction is formed at the center of the slide plate 11. A step portion 15 is formed on the inner peripheral portion of the long hole 14. A ring-shaped rib 16 is formed on the outer peripheral portion of the step portion 15. The protruding height of the ring-shaped rib 16 from the surface of the slide plate 11 is set to be equal to or less than the thickness of the upper collar 10.

  FIG. 4 is a view showing the upper collar 10. In FIG. 4, the upper collar 10 is shown as a single member, but the upper collar 10 is usually fixed to the upper structure 3 by welding in advance. A long hole 17 for shear restraint extending in the bridge axis direction and a female screw hole 18 for set bolts are formed at four corners in the center of the upper rod 10. The long hole 17 for shear restraint has substantially the same shape as the outer surface of the ring-shaped rib 15 formed on the slide plate 11 shown in FIG. 2, and the outer surface of the ring-shaped rib 15 formed on the slide plate 11 and the upper collar 10. The inner surface of the long hole 17 for shear restraint contacts. By forming the ring-shaped rib 15 on the slide plate 11 and functioning as a shear restraining member against the horizontal force in the direction perpendicular to the bridge axis of the upper structure 3, the thickness of the slide plate 11 can be reduced.

  The shear restraint member 9 having one end fixed to the lower rod 4 passes through the long hole 14 formed in the slide plate 11, and the other end is a shear constraint formed in the upper rod 10 fixed to the upper structure 3 by welding. It extends to the long hole 17 for use. The movable block 19 is fitted from the other end of the shear restraining member 9 so as to be movable up and down. The shear restraining member 9 is preferably arranged at the center of the lower collar 4 so as to pass through the central portion of the elastic bearing 6. The cross-sectional shape of the shear restraining member 9 may be any shape, but a circular shape is preferable in that the movable block 19 can adjust the direction for functioning as a guide when the slide plate 11 slides.

  5 and 6 are diagrams showing the movable block 19. The movable block 19 is formed with a through hole 20 for fitting the shear restraining member 9 in the center. The inner diameter of the through hole 20 is slightly larger than the outer diameter of the shear restraining member 9. The planar side portions 21 of the movable block 19 are in surface contact with the inner surface of the elongated hole 14 formed in the slide plate 11 to form a slide surface. The height of the side portions 21 is set to be equal to or less than the thickness of the slide plate 11 below the step portion 15 formed on both sides of the long hole 14 of the slide plate 11, and is movable when sliding along the surface of the lower collar 4 of the slide plate 11. The lower surface of the block 18 is prevented from coming into contact with the lower iron 4 surface.

  The movable block 18 is integrally formed with a flange portion 22 that is wider than the width of the long hole 14. The width of the flange portion 22 is slightly narrower than the width between the step portions 15 formed on both sides of the long hole 14, and the end portion of the flange portion 22 is stepped by the displacement due to the horizontal force in the direction perpendicular to the bridge axis of the upper structure 3. Prevents contact with 15 walls. The thickness of the flange portion 21 is slightly lower than the depth of the step portion 15 to ensure a gap between the flange portion 22 and a ring nut 23 that is screwed to the other end portion of the shear restraining member 9 described later.

  A female screw portion is formed at the other end of the shear restraining member 9, and a ring nut 23 shown in FIG. 7 is screwed into the female screw portion. In this state, the slide plate 11 is fixed with the set bolt 12 to the upper arm that has been fixed to the upper structure 3 made of steel girders with the set bolt 12 in advance, so that the one-way movable support device 1 for the bridge becomes the lower structure 2. And the upper structure 3. In this embodiment, one end of the shear restraint member 9 is fixed to the lower structure 2 side, and the slide plate 11 is fixed to the upper structure 3 side, but one end of the shear restraint member 9 is fixed to the upper structure 3 side, The slide plate 11 may be fixed to the lower structure 2 side.

  FIG. 8 is a diagram showing another embodiment of the one-way movable bearing device for a bridge according to the present invention. The same members as those in the embodiment shown in FIG. Here, only the configuration different from the embodiment shown in FIG. 1 will be described, and the description of the same configuration will be omitted.

  In the unidirectional movable bearing device 1 for a bridge according to this embodiment, an elastic bearing 6 is disposed on a lower arm 4. The elastic support 6 is formed by vulcanizing and integrating an elastic member 7 such as rubber and a connecting steel plate 8. The elastic bearing 6 and the lower collar 4 may be integrally formed by vulcanization.

  A shear restraining member 9 having one end fixed to the lower rod 4 passes through the elastic bearing 6 and is erected vertically upward. The slide plate 11 fixed to the upper structure 3 side forms a slide surface with the upper connecting steel plate 8 of the elastic bearing 6.

  In the embodiment shown in FIG. 8, the shear restraining member 9 and the elastic bearing 6 are fixed to the lower structure 2 side, and the slide plate 11 is fixed to the upper structure 3 side. It may be fixed to the upper structure 3 side, and the slide plate 11 may be fixed to the lower structure 2 side.

  Next, the operation of the bridge one-way movable support device 1 according to the embodiment of the present invention will be described with reference to FIG. First, with respect to the horizontal force in the bridge axis direction of the upper structure 3, the slide plate 11 fixed to the upper structure 3 of the movable block 18 that abuts on the inner peripheral surface of the long hole 14 formed in the bridge axis direction. In the embodiment shown in FIG. 1, using both side portions 20 as guides, a slide surface is formed by the surface of the lower collar 4 and, in the embodiment shown in FIG. 8, the surface of the connecting steel plate 8 of the elastic bearing 6 to form a bridge shaft. Absorb by sliding in the direction.

  When the slide plate 11 is slid in the bridge axis direction, the load of the frictional force due to the slide is borne by the movable block 18 so that the frictional force accompanying the slide is not applied to the shear restraining member 9. When the movable block 18 is damaged by a frictional force, the movable block 18 can be easily replaced by releasing the screwing of the ring nut 23 with the tip of the shear restraining member 9.

  For horizontal force in a direction perpendicular to the bridge axis direction of the superstructure 3, first, an engaging portion in surface contact between the shear restraining long hole 17 of the upper collar 10 and the ring-shaped rib 16 formed in the slide plate 11 is formed. The horizontal force is transmitted to the slide plate 11 through the slide plate 11. The horizontal force transmitted to the slide plate 11 is transmitted to the movable block 18 from a contact portion where the inner peripheral surface of the elongated hole 14 of the slide plate 11 is in surface contact with both side portions 20 of the movable block 18. The horizontal force transmitted to the movable block 18 is transmitted to the shear restraining member 9. The horizontal force in the direction perpendicular to the bridge axis of the superstructure 3 is not directly transmitted to the shear restraint member 9 but is sheared via the surface contact portion between the movable block 18 fitted to the shear restraint member 9 and the slide plate 11. It is transmitted to the restraining member 9. Therefore, stress is not concentrated on a part of the shear restraining member 9 due to the horizontal force perpendicular to the bridge axis, and the diameter of the shear restraining member 9 can be reduced.

  With respect to the lifting force of the upper structure 3, the movable block 19, which is inserted into the shear restraining member 9 so as to be movable up and down, rises together with the upward movement of the upper structure 3, and the flange portion 22 of the movable block 19 is connected to the ring nut 23. Therefore, the upward movement is prevented, and the upward lift force is accommodated by the engagement between the flange portion 22 of the movable block 19 and the step portion 15 of the slide plate 11.

  With respect to the rotational force of the upper structure 3, the gap between the flange portion 22 of the movable block 19 and the ring nut 23 screwed to the upper end of the shear restraining member 9 allows the rotational force of the upper structure 3.

  In this embodiment, the upper structure 3 is a steel girder. However, when the upper structure 3 is a concrete girder, the anchor bar embedded in the concrete girder and the upper bar 10 are fixed by welding, and the slide plate 11 and the upper bar 10 are fixed. May be fixed with a set bolt 12 from the slide plate 11 side. Even when the upper structure 3 is a concrete girder, the elastic bearing 6 may be fixed to the upper structure 3 and the slide plate 11 may be fixed to the lower structure 2.

  As described above, the one-way movable bearing device 1 for a bridge according to the present invention is such that the horizontal force in the direction perpendicular to the bridge axis of the superstructure 3 corresponds to the shear restraining member 9 penetrating the long hole 14 of the slide plate 11. The degree of freedom of arrangement of various members that can save installation space can be ensured. At that time, the horizontal force in the direction perpendicular to the bridge axis from the superstructure is not directly applied to the shear restraint member, but is transmitted through the surface contact portion with the movable block fitted to the shear restraint member. Since the load is evenly applied to the shear restraint member, stress is not concentrated on a part of the shear restraint member, and the diameter of the shear restraint member can be reduced. Moreover, it respond | corresponds with the slide which used the movable block of the slide plate as a guide to the horizontal force of a bridge axis direction. At that time, the movable block bears the frictional force accompanying the slide, the load due to the frictional force of the shearing restraint member can be eliminated, and the life of the shearing restraint member can be extended. Furthermore, the lifting force can be dealt with by engagement between the flange portion of the movable block and the slide plate whose movement in the vertical direction is restricted by the ring nut.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

Explanation of symbols

  1: Positional movable bearing device for bridge, 2: Lower structure, 3: Upper structure, 4: Lower arm, 5: Anchor bolt, 6: Elastic bearing, 7: Elastic member, 8: Connecting steel plate, 9: Shear restraining member 10: Upper rod, 11: Slide plate, 12: Set bolt, 13: Female screw hole for set bolt, 14: Long hole, 15: Stepped portion, 16: Ring-shaped rib, 17: Long hole for shear restraint, 18: Female screw hole for set bolt, 19: movable block, 20: through hole, 21: side, 22: flange, 23: ring nut

Claims (5)

A slide plate that is fixed to one side of the upper and lower structure and has a long hole extending in the direction of the bridge axis; A movable block having a side portion that is fitted to be vertically movable and abuts against an inner peripheral surface of the elongated hole, a flange portion that is wider than a width of the elongated hole, and a ring that is screwed to the other end of the shear restraining member A one-way movable bearing device for a bridge, comprising: a nut; The unidirectional movable bearing device for a bridge according to claim 1, wherein an elastic bearing is disposed on one side of the upper and lower structures, and the shear restraining member is disposed through the elastic bearing. The one-way movable support device for bridges according to claim 1 or 2, wherein a predetermined gap is formed between the flange portion of the movable block and the ring nut. The one-way movable support device for bridges according to any one of claims 1 to 3, wherein a step portion is formed on an inner peripheral portion of the elongated hole, and the step portion and the flange portion of the movable block are engaged. . Ring-shaped ribs are erected on the outer periphery of the long hole formed in the slide plate, and a long hole for shear restraint that engages with the outer surface of the ring-shaped rib is formed on the side where the slide plate is fixed. The unidirectional movable bearing device for bridges according to any one of claims 1 to 4, wherein members are arranged.

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