JP2018135656A - Bearing device for bridge acting as countermeasure for tsunami that exceeds specification - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for bridge acting as countermeasure for tsunami that exceeds specification which is capable of restricting damage caused by tsunami that exceeds specification to the superstructure and eliminating damage to the substructure, while also increasing the speed of restoration following the tsunami.SOLUTION: A bearing device for bridge acting as countermeasure for tsunami that exceeds specification of the present invention comprises: a base plate fixed to the substructure; a bearing device disposed on the base plate; a superstructure fixed to the bearing device; a side block fixed to the base plate; and a lift force stopping member connected to the side block with a knock-off bolt and partially engaged with the bearing member, which stops the lifting force of the bearing device. The upper portion from the part of the bearing device with which the lifting force stopping member is engaged is not connected to the substructure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bridge support device for a tsunami exceeding a setting.

  As a conventional tsunami-supporting bridge support device, Japanese Patent Application Laid-Open No. 2013-170448 discloses that a conventional abutment and a support are first stopped, and a vertical steel pipe pile is used as a lower structure. Connected and integrated, and third, steel deck with deck plate and U-rib is welded to the horizontal steel main girder of the upper structure by butt welding, and the lower structure, upper structure and the entire steel deck are integrated. The tsunami caused by a large earthquake is made lighter and stronger by using steel with high specific strength instead of using low specific strength concrete for the lower and upper structures. A steel slab steel girder bridge is proposed.

  In addition, in JP-A-2006-056611, in order to reduce the wave force of the tsunami that has reached, a bridge girder provided with a girder and a floor slab that is connected to the upper surface of the girder and protrudes outward in the width direction from the girder. A wave wave reduction mechanism for a bridge having a vertical plate portion that is fixed to the floor slab on the surface on the lower side in the vertical direction on the sea side of the girder and extends in the lower side in the vertical direction and in the bridge axis direction. Tsunami bridge structures have been proposed.

JP 2013-170448 A Japanese Patent Laid-Open No. 2006-056611

  However, in steel floor slab steel girder bridges, where the lower structure and the upper structure are made strong and the upper structure is rigidly connected to the lower structure to counter the tsunami, a support device is installed between the lower structure and the upper structure. Therefore, normal running vibrations are directly transmitted to the lower structure, which may cause deterioration of the lower structure over a short period of time. Furthermore, the lower structure is reinforced with steel pipe piles, resulting in a high-cost bridge. Have.

  In addition, the bridge structure that reduces the tsunami wave force that reaches the tsunami acts to confine the tsunami that the vertical plate attached to the slab urges against in the event of a tsunami that exceeds the setting, adding a large lifting force to the slab and adding to the entire bridge Have the problem that may damage

  The present invention provides a tsunami-compatible bridge support device that exceeds the setting capable of accelerating the post-tsunami recovery speed by damaging the tsunami to the upper structure and solving the problems of the prior art, eliminating the damage of the lower structure. Objective.

In order to solve the above problems, a tsunami-supported bridge support device exceeding the setting of the present invention includes a base plate fixed to the lower structure, a support device disposed on the base plate, and an upper structure fixed to the support device. A side block fixed to the base plate, and an upper lift stop member that is connected to the side block by a knock-off bolt and engages with a part of the support device to stop the lift force of the support device, and the upper lift stop member engages A portion above the support device is not fixed to the lower structure.

  Further, the tsunami-compatible bridge support device exceeding the setting of the present invention is characterized in that a notch is formed in a part of the knock-off bolt.

  Further, a tsunami-compatible bridge support device exceeding the setting of the present invention is characterized in that the support device is any one of a fixed rubber bearing, a movable rubber bearing, a fixed steel bearing, and a movable steel bearing that are not fixed to the lower structure. .

  An upper lifting force stop member joining surface comprising three vertical surfaces that are U-shaped in top view is formed on the side block, and the upper lifting force stop member is engaged with the upper lifting force stop member joining surface.

A base plate fixed to the lower structure, a support device disposed on the base plate, an upper structure fixed to the support device, a side block fixed to the base plate, and a part of the support device connected to the side block by a knock-off bolt A tsunami exceeding the setting by not fixing the upper part from the part of the support device to which the upper lift stop member engages to the lower structure. When a large lifting force is added to the upper structure, the knock-off bolt that fixes the upper lifting stop member to the side block breaks due to the larger lifting force, and the upper lifting force stop member engages from a part of the support device. The upper part of the bearing device and the upper structure are separated from the lower structure, avoiding a heavy load on the lower structure and preventing the upper structure and the lower structure from collapsing due to the tsunami By placing the new bearing unit and the upper structure remaining substructure allows for immediate reconstruction of the bridge and lifeline after tsunami exceeds the set.
By forming a notch in a part of the knock-off bolt, it is possible to easily set the breaking position of the knock-off bolt and the magnitude of the lifting force due to the tsunami exceeding the setting at which the knock-off bolt breaks.
By adopting any one of a fixed rubber bearing, a movable rubber bearing, a fixed steel bearing, and a movable steel bearing that are not fixed to the lower structure, the bearing apparatus can be applied to various bearing apparatuses that are not fixed to the lower structure.
An upper lifting force stop member joining surface consisting of three vertical surfaces having a U-shape in top view is formed on the side block, and the upper lifting force stop member is engaged with the upper lifting force stop member joining surface so that It is possible to prevent stress from being applied.

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. (A) (b) It is a figure which shows embodiment of this invention. (A) (b) It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a tsunami-compatible bridge support apparatus exceeding the setting of the present invention as seen from the bridge axis direction, and FIG. 2 is a side view as seen from a direction perpendicular to the bridge axis. In the embodiment shown in the drawings, a fixed rubber bearing device will be described as an example. However, the bearing device of the present invention can be applied to any of a movable rubber bearing, a fixed steel bearing, and a movable steel bearing.

  A base plate 3 is fixed to the lower structure 2 of the bridge by anchor bolts 4. A lower end of a shear restraining member 6 that restrains horizontal shearing of the support device 1 against horizontal displacement is fixed to the base plate 3 by means such as screwing. The shear restraining member 6 is erected so as to extend in the vertical direction from the base plate 3.

  An embodiment of the support device 1 that is placed without being fixed to the base plate 3 will be described with reference to FIG. In the support device 1, an upper connecting steel plate 7, a lower connecting steel plate 8, and an elastic member 9 in which reinforcing steel plates and elastic rubber are alternately laminated are integrated by vulcanization molding.

  An upper lift stop receiving member 10 is disposed on the upper connecting steel plate 7. The upper lift stop receiving member 10 may be formed integrally with the upper connecting steel plate 7 of the support device 1. The upper lift stop receiving member 10 is formed with an upper lift stop receiving portion 10a that engages with an upper lift stop portion 11a of an upper lift stop member 11 described later. The upper lift stop receiving member 10 is engaged with a concave portion 14a formed in an upper flange 14 fixed to an upper structure 12 such as a steel girder by a set bolt 13 and is subjected to horizontal shear due to a horizontal stress of the upper structure 12. A shearing restraining portion 10b for restraining is formed.

  A through-hole 18 into which the shear restraint member 6 is inserted is formed in the support device 1 and the upper lift stop receiving member 10 disposed on the support device 1, and the support device 1 and the upper lift stop receiving member 10 are The shear restraining member 6 is inserted into the through hole 18 and is arranged to be movable downward with respect to the lower structure 2.

  FIGS. 4A and 4B are a top view and a side view of the side block 16 fixed to the base plate 3 by the fixing bolt 15. Base plate fixing portions 16 a for fixing to the base plate 3 are formed on both sides of the side block 16. In the center of the side block 16, an upper lift stop member fixing portion 16b is formed. A plurality of fixing bolt insertion holes 16c extending in the vertical direction are formed in the base plate fixing portion 16a, and a plurality of knock-off bolt insertion holes 16d extending in the horizontal direction are formed in the upper lifting force stopping member fixing portion 16b.

  The height of the base plate fixing portion 16a is lower than the height of the upper lifting force stopping member fixing portion 16b, and the length of the base plate fixing portion 16a in the X direction is longer than the length of the upper lifting force stopping member fixing portion 16b in the X direction. As a result, an upper lifting force stop member joining surface 16e composed of three vertical surfaces having a U-shape as viewed from above is formed between the base plate fixing portions 16a on both sides and the central upper lifting force stopping member fixing portion 16b.

  FIGS. 5A and 5B are a side view and a front view of the upper lifting force stopping member 11 that is joined to the upper lifting force stopping member joining surface 16e formed of the three vertical surfaces of the side block 16 and fixed by the knock-off bolts 17. FIG. is there. An upper lifting force stopping portion 11a that extends horizontally forward is formed at the upper portion of the upper lifting force stopping member 11, and a female screw hole for a knock off bolt for screwing a horizontally extending knock off bolt 17 into the upper lifting force stopping member 11 is formed. A plurality of 11b are formed.

  As shown in FIG. 6, a notch 17 a is formed in the vicinity of the screwing position of the upper lift stop member 11 of the knock-off bolt 17. By forming the notch 17a in the knock-off bolt 17, the breaking position of the knock-off bolt 17 due to the tsunami lifting force exceeding the setting is specified, and the setting of the magnitude of the lifting force due to the tsunami exceeding the setting at which the knock-off bolt breaks is facilitated. It becomes possible.

  As a procedure for assembling the tsunami-supporting bridge support device exceeding the setting, the through-holes 18 formed in the support device 1 and the lifting force stopper receiving member 10 are inserted into the shear restraining member 6 erected on the base plate 3. Next, the side block 16 is fixed to a predetermined position with the fixing bolt 15 on the base plate 3.

  Next, the upper lifting force stopping member 11 is arranged on the upper lifting force stopping member joining surface 16e of the side block 16 so as to be joined to the three vertical joining surfaces, and the upper lifting force stopping portion 11a is supported by the upper lifting force receiving member 10. It is located on the part 10a.

  Thereafter, the knock-off bolt 17 is inserted from the knock-off bolt insertion hole 16d of the side block 16, the tip of the knock-off bolt 17 is screwed into the female screw hole 11b for the knock-off bolt of the upper lift stop member 11, and the upper lift stop member 11 is attached to the side block. 16 is fixed.

  In the next step, the concave portion 14a formed in the upper collar 14 fixed to the upper structure 12 with the set bolt 13 is arranged so that the shear restraining portion 10b of the upper lifting force receiving member 10 is fitted.

  The operation and effect of the tsunami-supporting bridge support device exceeding the setting configured as described above will be described. When a tsunami exceeding the set level strikes, the shear restraining member 6 fixed to the base plate 3 can resist and resist the shear deformation of the support device 1 and the upper structure 12 against the lateral stress caused by the tsunami. It is.

  When a large lifting force is applied to the upper structure 12 due to a tsunami exceeding the setting, when the lifting force reaches a predetermined magnitude, a portion of the notch 17a of the knock-off bolt 17 that fixes the lifting force stopping member 11 to the side block 16 is used. The bearing device 1, the upper lift stop receiving member 10, and the upper structure 12 that are broken and arranged on the shear restraining member 6 so as to be movable up and down are separated from the lower structure 2, thereby avoiding a large load on the lower structure 2. By preventing the collapsing of the upper structure 12 and the lower structure 2 due to the tsunami, and placing the new bearing device 1 and the upper structure 12 in the remaining lower structure 2, the bridge and lifeline can be quickly restored after the tsunami exceeding the setting. Enable.

  The tsunami-compatible bearing device exceeding the setting of the present invention includes a movable rubber bearing, a fixed steel bearing, and a movable steel bearing whose upper part is not fixed to the lower structure. It is applicable to any of these.

  1: Supporting device, 2: Substructure, 3: Base plate, 4: Anchor bolt, 6: Shear restraining member, 7: Upper connecting steel plate, 8: Lower connecting steel plate, 9: Elastic member, 10: Upper lift stop receiving member, 10a: Upper lift stop receiving portion, 10b: Shear restraint portion, 11: Upper lift stop member, 11a: Upper lift stop portion, 11b: Female screw hole for knock-off bolt, 12: Upper structure, 13: Set bolt, 14: Upper沓, 14a: recessed portion, 15: fixing bolt, 16: side block, 16a: base plate fixing portion, 16b: upper lifting stop member fixing portion, 16c: fixing bolt insertion hole, 16d: knock-off bolt insertion hole, 16e: upper lifting stop Member joint surface, 17: knock-off bolt, 17a: notch, 18: through hole

Claims (4)

A base plate fixed to the substructure;
A bearing device disposed on the base plate;
An upper structure fixed to the bearing device;
A side block fixed to the base plate;
An upper lifting force stop member connected to the side block by a knock-off bolt and engaging with a part of the bearing device to stop the lifting force of the bearing device;
With
A support device for a tsunami-compatible bridge that exceeds a setting, characterized in that the upper part of the support device with which the upper lift stop member engages is not fixed to the lower structure.   The bridge support device for a tsunami-resistant bridge exceeding the setting according to claim 1, wherein a notch is formed in a part of the knock-off bolt.   The tsunami-resistant bridge exceeding the setting according to claim 1 or 2, wherein the bearing device is any one of a fixed rubber bearing, a movable rubber bearing, a fixed steel bearing, and a steel movable bearing that are not fixed to the lower structure. Bearing device.   The upper lifting force stopping member joining surface comprising three vertical surfaces having a U-shape in top view is formed on the side block, and the upper lifting force stopping member is engaged with the joining surface of the upper lifting force stopping member. Tsunami-compatible bridge support device that exceeds the setting described in any one of the items.

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