JPH1037131A - Expansion/contraction device of bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge expanding/contracting device which prevents a vehicle from falling off even in the case a joint opening widens largely in the event of an earthquake and allows the least necessary vehicles such as ambulance car to pass through. SOLUTION: This steel plates bent in a V-shape are laid in line in the direction perpendicular to the axis of a bridge, and an aux. device 14 with the two ends fixed to a fixing material is set over between floor plates 11, and the two ends are secured by anchor bolts 15. Thereon a rubber joint 18 made of rubber 17 in which a load bearing member 16 is embedded is placed and set over, and the two ends are secured by anchor bolts 19. When any joint opening widens largely in the even of a large earthquake, the bent steel plates are stretched and bear the upper rubber joint 18 and the vehicle load, and the vehicle concerned is prevented from falling off, and also possibility of the least necessary vehicles to pass through is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bridge expansion and contraction device,
More particularly, the present invention relates to a load-supporting telescopic device for a bridge.

[0002]

2. Description of the Related Art There are many types of load-supporting telescopic devices having a structure in which a rubber material and a steel material are combined to support an automobile load between floor slabs, and a structure using a face plate or a finger plate. Used. FIG. 1 shows a rubber joint system in which a rubber material and a steel material are combined, and the expansion and contraction is absorbed by the shear deformation of the rubber 1,
The structure is such that the load on the vehicle is supported by the steel plate 2.

[0003] Fig. 2 shows the latter steel finger joint system, in which the floor slab has a structure in which the left and right sides of the floor slab protrude so as to mesh with each other so as to mesh with each other, and are laid over the floor slab. It is used when you want to make it wider. In addition, there has been proposed a structure in which a large number of bent thin steel plates are arranged in parallel as load supporting members, and both ends thereof are fixed to a fixing material, and the gaps are filled with a rubber-like elastic material (Japanese Patent Publication No. Sho 57-87). -52444).

[0004]

The rubber joint system and the steel finger joint system can sufficiently withstand the load of an automobile, but the displacement of the floor slab becomes large in the event of a great earthquake, and the play space reduces the amount of expansion and contraction of the expansion device. If the gap generated in the telescopic device is widened, the vehicle passing thereover may cause a fall accident. In the recent Great Hanshin Earthquake, there were many cases where girders collided with each other, causing the girders to be flipped and dropped. To cope with this problem, it is conceivable to install seismic isolation bearings on the bearings and widen the gap between the girders.However, the wider the gap, the more likely it is for the vehicle to fall when the gap between the expansion and contraction devices is widened. . In this regard,
In the case of a telescopic device in which bent thin steel plates are arranged side by side, there is an advantage that the amount of expansion and contraction can be increased and the play space can be expanded.
Due to its strength, there is a problem that it cannot sufficiently withstand the load of an automobile.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telescopic device capable of performing normal running of a vehicle without any support, preventing the vehicle from falling down even in the event of a great earthquake, and performing the required minimum running.

[0006]

A telescopic device according to the present invention is a load-supporting telescopic device, in which thin steel plates bent downward are arranged in parallel in a direction perpendicular to the bridge axis, and both ends thereof are fixed to a fixing material. An auxiliary device is provided, preferably fixed. According to the telescopic device of the present invention, in the case of the expansion and contraction of the girder due to the normal temperature change and the extent of expansion and contraction within the allowable amount, the same as the conventional telescopic device, it supports the vehicle load, but the telescopic device is In the event of a major earthquake that stretches beyond the allowable amount and loses its function as a telescopic device, it becomes possible to support the telescopic device and vehicle load while the bent thin steel plate of the auxiliary device is extended, and the vehicle falls down It prevents accidents, enables minimal travel in an emergency, and buffers the collision of girders by bending thin steel plates. Also, if the auxiliary device is fixed between the ends of the bridge girder, the bridge girder will be connected and supported by the auxiliary device,
The bridge girder will also function to prevent the bridge from falling.

The telescopic device according to the present invention can be applied to a bridge having a narrow gap or a wide bridge. However, when the telescopic device is used for a wide bridge, a seismic isolation bearing such as a rubber bearing or a viscous damper is mounted on the bridge girder. It is desirable to adopt.

[0008]

FIG. 3 shows an example in which the expansion and contraction device according to the present invention is used between floor slabs 11 each having a play space of about 30 cm. As shown in FIG. A thin steel plate 12 bent in a vertical direction or a thin steel plate 10 formed in a corrugated shape as shown in FIG.
After fixing the auxiliary device 14 fixed on both sides and fixing both ends with the anchor bolts 15, the width is about 50 cm on it.
A rubber joint 18 made of a rubber material 17 in which a steel load supporting plate 16 is embedded is placed and bridged, and both ends of the rubber joint 18 are similarly fixed by anchor bolts 19. In the figure, reference numeral 20 denotes a depression formed to give the rubber material 17 elasticity.

According to this embodiment, the load on the vehicle can be sufficiently supported by the support plate 16 in the rubber joint as shown in FIG. The vehicle load is supported by the support plate 16 and the lower auxiliary device 14 even in the event of an earthquake in which the play space opens to about 40 cm as shown in FIG. As shown in FIG. 8, the function of the rubber joint 18 is impaired in the event of a large earthquake having a play space of about 40 cm or more, as shown in FIG. In this embodiment, the upper rubber joint 18 is supported by its bending rigidity or film rigidity and can support the load of the vehicle. In the present embodiment, an example in which the play space is widened to about 30 cm is shown. Of course, it can be used for a telescopic device having a play space of about 10 cm.

FIG. 9 shows a telescopic device as a supported steel finger joint 22 as shown in FIG. 2, and an auxiliary device 14 shown in FIG.
No. 4 fixing member 13 and bridge girder 23 are fixed with bolts and nuts 24.

[0011]

The present invention is configured as described above and has the following effects. According to the telescopic device according to claim 1,
Even if the play area may be greatly opened during the earthquake, the thin steel plate of the auxiliary device will function to support the upper telescopic device and the vehicle load in a state where it has expanded from the bent state,
It is possible to prevent the vehicle from falling down and to ensure the minimum necessary traffic of vehicles such as emergency vehicles.

According to the telescopic device according to the second aspect, the auxiliary device connects the bridge girders to limit the movement of the bridge girders, thereby fulfilling the function of preventing bridge drop. If the bearing part is a seismic isolation bearing as in the telescopic device according to claim 3, the collision between girders in the event of a great earthquake is buffered in conjunction with the bent thin steel plate, and the clearance between the girders is widened. It is possible to prevent a bridge from being dropped due to collision between girders.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a rubber joint type expansion device.

FIG. 2 is a plan view of a supported steel finger joint.

FIG. 3 is a cross-sectional view of a telescopic device according to the present invention including an auxiliary device.

FIG. 4 is a plan view of an auxiliary device.

FIG. 5 is a plan view of another example of the auxiliary device.

FIG. 6 is a schematic diagram in a normal state.

FIG. 7 is a schematic diagram showing a state when the spread of play is small.

FIG. 8 is a schematic diagram showing a state in which a play space at the time of a great earthquake has greatly expanded.

FIG. 9 is a cross-sectional view of another example of the extension device.

[Explanation of symbols]

1. Rubber 2. Steel plate 11. Floor slab 12. Thin steel plate 13. Fixing material 14. Auxiliary device 15, 19 ... Anchor bolt 20 ... Depression 22 ... Steel finger joint 23 ... Bridge girder 24 bolts and nuts

Claims (3)

[Claims] 1. A load supporting type telescopic device, comprising an auxiliary device in which thin steel plates bent below are arranged in parallel in a direction perpendicular to the bridge axis and both ends are fixed to a fixing material. 2. An auxiliary device is fixed to an end of a bridge girder.
A telescopic device for a bridge as described. 3. The expansion and contraction device for a bridge according to claim 1, wherein the bearing portion of the bridge girder is a seismic isolation bearing.