JPH0349125Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention relates to a movable support for structures installed on the movable fulcrum side of structures such as bridges and elevated structures. The present invention relates to a movable support equipped with a movement regulating member that resists sudden displacement such as.

(2) Conventional technology Conventionally, this type of movable bearing has been used to transmit the load of the upper structure such as a bridge girder or vehicles passing over it to the lower structure such as a bridge pier, and to release the expansion and contraction of the upper structure. A plurality of rollers are arranged between the shoe and the lower shoe as rolling members, and a pin is arranged between the upper shoe and the middle shoe to remove deflection (so-called pin rollers). bearings) are used.

A movement regulating member is added between the intermediate shoe and the lower shoe to prevent excessive relative displacement in the bridge axis direction caused by sudden displacement such as an earthquake. This role is played by a side block that is fixed to the lower shoe with bolts, and is engaged with a notched recess formed on the side surface perpendicular to the bridge axis. In other words, this side block resists the large upward lifting force that acts between the intermediate shoe and the lower shoe due to earthquakes, etc., and also engages with the notch recess of the intermediate shoe and generates a force in the bridge axis direction between the intermediate shoe and the intermediate shoe. It plays a role in controlling excessive horizontal displacement of the parts by collision with each other. Therefore, if an excessive horizontal displacement force is generated between the intermediate shoe and the lower shoe due to an earthquake, etc., a large shearing force will be applied to the bolts that fix the side block to the lower shoe, causing the bolt to break. In the end, it becomes useless as a side block.

(3) Problems that the invention aims to solve The present invention was created in view of the problems of the conventional side blocks, and the problem is that the large upper lift force that acts between the intermediate shoe and the lower shoe due to earthquakes, etc. The purpose of this invention is to obtain a movement restriction structure in a movable support that effectively counters these upward lifting forces and horizontal forces.

B. Structure and operation of the device (1) Means for solving the problems In order to achieve the above object, the movable support for structures of the present invention adopts the following structure (technical means). That is, it has an upper shoe 1 fixed to the upper structure G and a lower shoe 2 fixed to the lower structure B, and between the upper shoe 1 and the lower shoe 2, an intermediate shoe 3 and a rolling member 4 are provided. In this support, the side portion of the intermediate shoe 3 in the direction perpendicular to the bridge axis has a notched recess 10 and a notched recess 1.
A collision block 11 is integrally formed with the bottom surface of the lower shoe 2 and protrudes downward, and a restraining block 13 is formed on the upper surface of the lower shoe 2 in the direction perpendicular to the bridge axis, facing each other with an interval in the bridge axis direction. are integrally formed to protrude upward, and the collision block 11 is disposed between the restraining blocks 13 with a movement range in the bridge axis direction. , a floating prevention block 16 fixed to the lower shoe 2
engages its upper locking portion 19 with the upper surface of the intermediate shoe 3, and also engages its standing leg portion 18 with the notch recess 18.
The impact block 11 is arranged with a movement range larger than that of the collision block 11 in the bridge axis direction within the bridge axis direction.

(2) Effect Under normal conditions, temperature expansion/contraction displacement and deflection of the upper structure G are relieved by the movable support structure.

In an emergency such as an earthquake, when a sudden displacement occurs between the intermediate shoe and the lower shoe, horizontal displacement in the bridge axis direction is prevented by the collision between the impact block and the restraint block. Even if the collision block and restraint block are damaged due to collision, the floating prevention block and the notch in the intermediate shoe that engages with the block will prevent the bridge from moving in the axial direction. Movement in that direction is blocked by collision with the recess. This ensures double safety against excessive movement in the bridge axis direction. In addition, an anti-floating block prevents upward lift.

Note that horizontal displacement in the direction perpendicular to the bridge axis is prevented by other appropriate means.

C. Effects of the invention The movable support for structures of the invention has the above-described configuration and functions, and therefore has the following unique effects.

If the impact block and restraint block collide with each other due to horizontal displacement in the bridge axis direction that exceeds the permissible range, and even if these blocks are damaged, the floating prevention block and the intermediate shoe with which the block engages will be damaged. The displacement can be prevented by the collision with the notch recess, thereby ensuring double safety against excessive relative movement in the bridge axis direction.

Since the collision block and the restraining block are integrally formed with the middle shoe and the lower shoe, respectively,
It has greater strength and can withstand larger horizontal forces.

D Example An example of the movable support for structures of the present invention will be described based on the drawings.

1 to 3 show an embodiment of the present invention.

Here, G is the superstructure and B is the substructure.

This support H is an upper shoe 1 fixed to the upper structure G.
An intermediate shoe 3 and a roller 4 are arranged between the lower shoe 2 and the lower shoe 2 fixed to the lower structure B. The upper shoe 1 and the intermediate shoe 3 are rotatable via pins 5 installed in their bearings 1a and 3a, and absorb the tilting displacement (ie, deflection) of the upper structure G. Cap members 6 are attached to both ends of the pin 5 so as to wrap around the bearing portions 1a and 3a of the upper shoe 1 and the middle shoe 3, and are fixed with bolts 7, thereby preventing the upper shoe 1 from floating up. Note that if the bearing portions 1a and 1b are of a comb-teeth type that engage with each other, the cap member 6 may be omitted.

Furthermore, the expansion and contraction displacement of the upper structure G is absorbed by the rollers 4 arranged between the lower shoe 2 and the middle shoe 3. A hard member 8 is built up on the rolling surfaces of the rollers 4 in the lower shoe 2 and the middle shoe 3. 9 is a tightening bolt.

In this embodiment, annular recesses 4a and 5a are formed at the center of the roller 4 and pin 5 in the direction perpendicular to the bridge axis, respectively, and these recesses 4
Convex portions that fit into the upper shoe 1, the middle shoe 3, and the lower shoe 2 are respectively formed to fit into the upper shoe 1, the middle shoe 3, and the lower shoe 2, and these serve to restrict movement against horizontal forces in the direction perpendicular to the bridge axis.

A cutout-like recess 10 is formed on both sides of the lower end of the intermediate shoe 3 in the direction perpendicular to the bridge axis, and an impact block 11 that projects downward is vertically provided along the inside of the recess 10.

On both sides of the lower shoe 2 in the direction perpendicular to the bridge axis, two restraining blocks 13, 13 are arranged with a gap 14 in the bridge axis direction, corresponding to the collision block 11. The collision block 11 is disposed in this gap 14 with a movement range in the bridge axis direction.

These collision blocks 11 and restraint blocks 1
3 is integrally formed on the middle shoe 3 and the lower shoe 2.

The floating prevention block 16 includes a base 17, a standing leg 1
8 and a locking part 19, the standing leg part 18 faces the recess 10 of the intermediate shoe 3, and the locking part 19 is installed on the upper surface of the intermediate shoe 3 with a slight gap, so that the base part 17 is fitted. The mating convex portions 20 are fitted into recesses 21 formed on both ends of the lower shoe 2, and are firmly fixed to the lower shoe 2 with fixing bolts and nuts 25.

In the arrangement of this floating prevention block 16, the movement range in the bridge axis direction between the standing leg 18 disposed in the recess 10 of the intermediate shoe 3 and the recess 10 is the same as that of the collision block 11 and restraint block 13 described above. It is said to be larger than the range of movement between

The movable bearing of this embodiment operates as follows.

At normal times, temperature expansion and contraction displacements of the upper structure G are released by the rollers 4, and rotational displacements such as vibrations of the upper structure G are released by the pins 5. During this time, since the collision block 11 is installed with a margin between the restraint blocks 13, the collision block 11 does not collide with the restraint block 13.
It does not inhibit temperature expansion/contraction displacement.

In an emergency such as an earthquake, when a sudden relative displacement occurs between the middle shoe 3 and the lower shoe 2 in the bridge axis direction, the horizontal displacement in the bridge axis direction is caused by the collision between the collision block 11 and the restraint block 13. is prevented by In addition, the locking portion 19 of the anti-float block 16 is used against upward lift.
engages with the intermediate shoe 3 to prevent it from floating.

Even if the block is damaged due to a collision between the collision block 11 and the restraining block 13, displacement in the bridge axis direction will be prevented by the collision between the floating prevention block 16 and the notch recess 10 of the intermediate shoe 3. Therefore, a situation such as the intermediate shoe 3 and, furthermore, the upper shoe 1 integrated with the intermediate shoe 3 and the pin 5 falling off from the lower shoe 2 does not occur.

Note that the horizontal displacement in the direction perpendicular to the bridge axis is regulated by fitting of the concave portions 4a and 5a formed in the roller 4 and the pin 5 with the convex portions formed in the upper shoe 1, the middle shoe 3, and the lower shoe 2.

[Brief explanation of the drawing]

The drawings show an embodiment of the movable support for structures of the present invention, and FIG. 1 is a partially front, partially central sectional view of one embodiment, and FIG. XX cross section) and FIG. 3 are exploded perspective views of the main parts thereof. G... Upper structure, 13... Lower structure, 1... Upper shoe, 2... Lower shoe, 3... Middle shoe, 4... Roller,
5...Pin, 11...Collision block, 13...Restriction block, 20...Floating prevention block.

Claims (1)

[Claims for Utility Model Registration] It has an upper shoe 1 fixed to the upper structure G and a lower shoe 2 fixed to the lower structure B, and between the upper shoe 1 and the lower shoe 2 is an intermediate shoe 3. In addition, in the bearing in which the rolling member 4 is disposed, the side portion of the intermediate shoe 3 in the direction perpendicular to the bridge axis includes a notch recess 10 and an impact that is connected to the bottom surface of the notch recess 10 and protrudes downward. A block 11 is integrally formed, and a restraining block 13 is integrally formed on the upper surface of the lower shoe 2 in the direction perpendicular to the bridge axis, protruding upward and facing each other at a distance in the bridge axis direction. The collision block 11 is disposed between the opposing restraint blocks 13 with a movement range in the bridge axis direction, and the notch recess 10 of the intermediate shoe 3 has a floating block fixed to the lower shoe 2. The prevention block 16 engages the upper locking part 19 with the upper surface of the intermediate shoe 3, and also moves its upright part 18 in the notch recess 10 in the bridge axis direction of the collision block 11. A movable support for a structure, characterized in that the support is arranged with a movement range larger than that of the structure.