JP3300305B2 - Articulated bridge fall prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge type girder and, more particularly, to a joint type bridge prevention device which is fixed to a bridge girder or abutment to be connected and is used to prevent the bridge girder from falling off from a pier or abutment. It is.

[0002]

2. Description of the Related Art Hitherto, a bridge prevention device has been used to prevent a bridge from falling, and various structures have been developed. One of them is a connection type bridge prevention device.

As shown in FIG. 12, this connection type bridge prevention device comprises a shock absorber 2 provided on a bracket 5 of each bridge girder 1 and a connecting member 3 made of PC steel for connecting these shock absorbers 2. The bridge girder 1 is connected to the bridge girder 1 to reduce the impact force and prevent the bridge girder 1 from dropping from the pier 4 due to the cutting of the connecting member 3. In the illustrated example, an example in which the bridge girder 1 is installed between the bridge girder 1 is shown. And
As the buffer device 2, a coil spring is generally used.

[0004]

However, the above-described coil spring has a constant spring constant and can be freely selected in terms of the amount of flexure, but the shape and weight are large and the installation work is complicated. Is left.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a connection-type fall prevention device which has a small shape and weight and facilitates installation work.

[0006]

The gist of the present invention is to provide a bridge girder, a connecting member for connecting the bridge girder or the abutment, a shock absorber fixed to each end of the connecting member, A fixing jig for fixing the cushioning device to an end of the connecting member,
The buffer device includes an inner pipe to which an end of the connecting member is fixed, an outer pipe inserted through the inner pipe, and fixed to the bridge girder or abutment, an inner surface of the outer pipe, and an outer pipe outside the inner pipe. It has a rubber which is fixed to the side surface, the outer pipe and the bridge girder or
Or a connecting type fall prevention device characterized in that a spacer is interposed between the abutment and the abutment . The gist of the present invention described in claim 2 is that the spacer is constituted by a plurality of spacers having different lengths, and the spacers having different lengths can be replaced or the combination thereof can be changed according to the design deformation amount of the rubber. The present invention resides in the connection type fall prevention device according to claim 1. The gist of the present invention described in claim 3 is that a support plate is fixed to an end of the inner pipe, and the articulated type bridge prevention device according to any one of claims 1 to 2 is provided. Exists in the device. The gist of the present invention described in claim 4 resides in a connection type fall prevention device according to claim 3, wherein a cushioning material is interposed between the support plate and the bridge girder or abutment. . The gist of the present invention described in claim 5 is that the cushioning material is fixed to the support plate, and the present invention resides in a connection type fall prevention device according to claim 4. The gist of the present invention described in claim 6 resides in a connection type fall prevention device according to any one of claims 1 to 5, wherein a depression is formed in an end surface of the rubber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS. The connection type fall prevention device according to the present embodiment shows an example of being provided between bridge girders similarly to FIG. 12, and only one bridge girder is shown, but the other bridge girder is symmetrically arranged. Is what is done.

[0008] Specifically, this articulated bridge fall prevention device is
A connecting member 11 for connecting a bridge girder to a bridge girder (only one bridge girder is shown), a buffer device 12 fixed to each end of the connecting member 11, and an end portion of the connecting material 11 An inner pipe 14 that is fitted to the connecting member 11 and is engaged with the connecting member 11 through the fixing jig 13; An outer pipe 15 fitted coaxially to the inner pipe 14 and engaged with a bracket 10 attached to the bridge girder; and an outer pipe 15 disposed between the outer pipe 15 and the inner pipe 14. And the rubber 16 fixed to the outer pipe 15 and the inner pipe 14, and the relative movement of the outer pipe 15 and the inner pipe 14 in the axial direction. More, by the rubber is elastically deformed to shear direction, and the basic configuration that has been made to produce a cushioning function.

More specifically, the outer pipe 1
A spacer 17 is interposed between the bracket 5 and the bracket 10. The spacer 17 has the same cross-sectional shape as the outer pipe 15 as shown in FIGS. 6 (a) to 6 (c). And this spacer 17
A plurality is provided so that the length is different.

The connecting member 11 is provided so as to penetrate the inner pipe 14 from the end face of the bracket 10, and threaded portions 11 a are formed at both ends thereof.
A pressure receiving plate 19 is mounted via a double nut as a fixing jig 13 which is screwed to the screw portion 11a, and the pressure receiving plate 19 is brought into contact with the end surface of the inner pipe 14 by The connecting member 11 is engaged with the inner pipe 14.

At the end of the inner pipe 14, when the inner pipe 14 is moved relative to the outer pipe 15 by a predetermined distance, the bracket 10
The cushioning material 20 to be brought into contact with the inside of the end face of is mounted.

As shown in FIG. 1, the cushioning member 20 includes a support plate 21 screwed to the end of the inner pipe 14.
2, they are integrally fixed by bolts 22.

The rubber 16 is formed in an annular shape, and has substantially arc-shaped depressions 23 formed at both ends thereof, so that the inner pipe 14 and the outer pipe 15 can move relative to each other in the axial direction. In addition, the shear deformation is facilitated.

The thus constructed bridge-type bridge prevention device according to the present embodiment receives vibrations due to an earthquake or the like.
When the bridge girders relatively move in the direction in which they are separated from each other, the inner pipe 14 is accordingly moved by the connecting member 11 by the connecting member 11.
It is relatively moved in the axial direction with respect to the outer pipe 15.

By the relative movement between the inner pipe 14 and the outer pipe 15, the rubber 16 interposed therebetween is elastically deformed in the shearing direction as shown in FIG. The vibration of the bridge girder is absorbed, and the bridge girder is prevented from falling. Further, when a large vibration is applied, the cushioning material 20 attached to the end of the inner pipe 14 is brought into contact with the inner surface of the bracket 10 and is elastically deformed, so that the vibration described above is cushioned. It is further absorbed by the material 20 to prevent the bridge girder from falling down.

Then, the shock absorber 12 is connected to the inner pipe 1.
4 and the outer pipe 15 and the rubber 16 interposed therebetween, the structure is simplified as compared with the coil spring, and the weight is greatly reduced. As a result, the construction becomes simple.

The various shapes, dimensions, and the like of the components shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like. For example, the rubber 16
Although the example in which the depression 23 formed in FIG. 1 is formed in an arc shape is shown, an elliptical shape as shown in FIG.
It is also possible to adopt a shape having a smooth bottom surface as shown in FIG. 0, and the length of the joint portion with the inner pipe 14 can be arbitrarily set as shown in FIGS. . By arbitrarily setting the shape of the rubber 16 in this manner, it is possible to adjust the elastic coefficient in the shear direction and adjust the vibration absorption characteristics.
In addition, the outer pipe can be made longer so that the outer pipe can be moved relative to the inner pipe without providing a spacer. Further, in the above embodiment, the steel girder has been described, but application to a concrete girder is of course also possible.

[0018]

Since the present invention is constructed as described above, it is possible to provide an articulated bridge prevention device having a simplified structure and a reduced weight, and its construction work is simplified. It can be.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, and is an enlarged longitudinal sectional side view of a cushioning material.

FIG. 3 is a side view showing an embodiment of the present invention.

FIG. 4 is an enlarged front view of a main part showing one embodiment of the present invention.

FIG. 5 shows one embodiment of the present invention, and is a side view of a spacer.

FIG. 6 shows one embodiment of the present invention, and is a front view showing a modified example of the spacer.

FIG. 7 shows one embodiment of the present invention, and is a longitudinal sectional front view showing a deformed state.

FIG. 8 is a longitudinal sectional front view showing a modification of the present invention.

FIG. 9 is a longitudinal sectional front view showing a modification of the present invention.

FIG. 10 is a longitudinal sectional front view showing a modification of the present invention.

FIG. 11 is a longitudinal sectional front view showing a modification of the present invention.

FIG. 12 is a longitudinal sectional view of a main part showing one conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge girder 2 Buffer device 3 Connecting material 4 Bridge pier 5 Bracket 10 Bracket 11 Connecting material 11a Screw part 12 Buffer device 13 Fixing jig 14 Inner pipe 15 Outer pipe 16 Rubber 17 Spacer 19 Pressure receiving plate 20 Buffer material 21 Support plate 22 Bolt 23 Depression

Continuation of the front page (56) References JP 9-242020 (JP, A) JP 9-95908 (JP, A) JP 10-131123 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) E01D 19/04

Claims (6)

(57) [Claims] 1. A connecting member for connecting a bridge girder, a bridge girder or an abutment, a buffer device fixed to each end of the connecting member, and a fixing jig for fixing the buffer device to an end of the connecting member. The shock absorber includes an inner pipe to which an end of the connecting member is fixed, an outer pipe inserted through the inner pipe, and fixed to the bridge girder or abutment, an inner surface of the outer pipe, have a rubber which is fixed to the outer surface of the inner pipe, said outer pipe, girders
Or a space between the bracket attached to the abutment
A bridge-type fall prevention device, which is interposed . 2. The spacer according to claim 1, wherein the spacer is constituted by a plurality of spacers having different lengths, and the spacers having different lengths can be exchanged or a combination thereof can be changed according to a design deformation amount of the rubber. Item 2. A connection-type fall prevention device according to item 1. 3. The connection type fall prevention device according to claim 1, wherein a support plate is fixed to an end of the inner pipe. 4. Attaching to the supporting plate and a bridge girder or abutment
The connection type fall prevention device according to claim 3, wherein a buffer material is interposed between the bracket and the bracket . 5. The apparatus according to claim 4, wherein the cushioning member is fixed to the support plate. 6. The connection type fall prevention device according to claim 1, wherein a depression is formed in an end surface of the rubber.