JP3619952B2 - Telescopic device for bridge - Google Patents

Description

BACKGROUND OF THE INVENTION
[0001]
The present invention relates to a bridge telescopic device.
[Prior art]
[0002]
For example, as shown in FIGS. 8 and 9, the finger-type expansion and contraction device for a bridge has a surface plate member 9 having finger portions 90 on the upper surfaces of adjacent bridge girders H and H fixed by an anchor or the like (not shown). The wheel load that has moved between the bridge girders H and H is supported by both finger portions 90, and the finger portions 90 of the surface plate material 9 on one side are expanded and contracted due to temperature changes of the bridge girders. It is made to absorb in the aspect inserted / removed between the adjacent finger parts 90 and 90 of the surface plate material 9 of the side.
[0003]
However, in the above-mentioned bridge expansion and contraction device, a large gap cannot be formed in the direction perpendicular to the bridge axis for the safety of vehicle traffic, and therefore, the relative movement of the large bridge girders H and H in the direction perpendicular to the bridge axis can be absorbed. I can't. Therefore, when the bridge girders H and H move greatly relative to each other in the direction perpendicular to the bridge axis due to an earthquake or the like, the finger portions 90 of the facing surface plate 9 collide with each other, not only damage the finger portions 90 but also other bridge members. Can also be damaged. In particular, in a seismic isolation design bridge, the seismic isolation function of the bridge may be impaired. In addition, when the finger portion 90 is damaged, the emergency vehicle cannot pass, which causes a major problem in the rescue operation.
[Problems to be solved by the invention]
[0004]
Accordingly, an object of the present invention is to provide a bridge extension / contraction device that can absorb a large amount of movement in a direction perpendicular to the bridge axis.
[Means for Solving the Problems]
[0005]
(Invention of Claim 1)
The invention described in claim 1 includes a foundation member fixed to the opposite side of the abutment on one side or the bridge girder and the other side of the bridge girder, a plurality of base members arranged in the direction perpendicular to the bridge axis, and the abutment on one side or A finger projecting between the bridge beam and the bridge beam on the other side, and a finger provided on one foundation member is loosely inserted between adjacent fingers provided on the other foundation member In the expansion and contraction device for bridges, the fingers arranged on at least one foundation member are swingably attached to the foundation member in a direction perpendicular to the bridge axis, and the fingers and the foundation member are locked by a knock-off member. It has become a state. The function of the bridge expansion and contraction device of the present invention will be described in detail in the section of the embodiment of the present invention below.
DETAILED DESCRIPTION OF THE INVENTION
[0006]
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
(Embodiment 1)
As shown in FIG. 1, the bridge telescopic device of this embodiment is disposed between bridge girders H and H supported by a bridge pier H ′ via a seismic isolation device M, as shown in FIGS. 1 and 2. As shown, the base member 1 fixed to the upper region where the bridge beams H, H are opposed to each other, and the base member 1 swings in a direction perpendicular to the bridge axis in a manner of projecting between the gaps U formed between the bridge beams H, H. A plurality of fingers 2 movably attached, and the free ends of the fingers 2 attached to one base member 1 are free of adjacent fingers 2 and 2 attached to the other base member 1 The play space U is closed in a manner of being inserted between the end portions.
[0008]
The base member 1 is made of steel and is long in the direction perpendicular to the bridge axis. As shown in FIGS. 3 and 4, the upper plate 11, the lower plate 12, and the vertical plate that connects the upper plate 11 and the lower plate 12 to each other. 13, reinforcing ribs 14, and a plurality of pins 10 erected in an upright posture between the upper plate 11 and the lower plate 12. The foundation member 1 is firmly fixed to the bridge girder H by anchor bolts (not shown). In this fixed state, the upper surface of the upper plate 11 and the upper surface of the bridge girder H are substantially flush.
[0009]
As shown in FIG. 4, the upper plate 11 is formed with semicircular protrusions on the inner edge at regular intervals, and has a through hole 11a into which the pin 10 is closely fitted at the center point of the semicircle. It is configured. Further, as shown in FIG. 4, the lower plate 12 has the same configuration as the upper plate 11 except for its narrow width, and has a through hole 12a into which the pin 10 is closely fitted.
[0010]
As shown in FIGS. 3 and 4, the finger 2 has a cylindrical portion 21 formed at a height slightly smaller than the length of the lower surface of the upper plate 11 and the lower plate 12, and is fixed to the cylindrical portion 21. It is comprised from the finger main body 20 currently made. In the finger 2, when the cylindrical portion 21 is extrapolated to the pin 10, the upper surface of the base end portion of the finger main body 20 and the upper surface of the upper plate 11 are substantially coincident as shown in FIG. 3. ing.
[0011]
Here, in this bridge extension / contraction device, as shown in FIG. 7, the knock pin NP portion protruding from the horizontal hole 13 a of the vertical plate 13 is inserted into the recess portion 21 a formed in the cylindrical portion 21.
[0012]
Therefore, the finger 2 does not oscillate due to the vibration when passing through the automobile, and the knock pin NP only when there is a relative movement in the direction perpendicular to the bridge axis of the bridge beams H and H where the opposing fingers 2 and 2 collide with each other. Is sheared and the finger 2 swings (from the state of FIG. 5 to the state of FIG. 6 as the axis of the pin 10). As a result, even when the bridge girders H and H are relatively moved relative to each other in the direction perpendicular to the bridge axis, the finger 2 is not damaged and the relative movement can be sufficiently absorbed, and the situation where other bridge members are damaged can be avoided. .
[0013]
In addition, the said knock-off structure is not limited to the said form, All structures can be employ | adopted if the finger 2 and the base member 1 are the states latched by the knock-off member.
[0014]
(Other embodiments)
In the first embodiment, the bridge telescopic device of the present invention is provided between the bridge girders. However, the bridge telescopic device of the present invention may be provided between the bridge girders and the abutment.
[0015]
In the first embodiment, both the fingers 2 and 2 swing. However, only one finger 2 may swing.
[0016]
Furthermore, with respect to the first embodiment, it is preferable that the fingers are covered with a thin rubber layer. This is because the generation of collision sound between fingers can be suppressed.
【The invention's effect】
[0017]
Since the present invention has the above-described configuration, the following effects can be obtained.
[0018]
From the description in the column of the embodiment of the present invention, a bridge expansion and contraction device capable of absorbing a large amount of movement in the direction perpendicular to the bridge axis can be provided.
[Brief description of the drawings]
[0019]
FIG. 1 is a front view of a bridge expansion / contraction device in which a bridge expansion / contraction device according to Embodiment 1 of the present invention is supported by a bridge pier via a seismic isolation device.
FIG. 2 is a perspective view of the bridge telescopic device.
3 is a cross-sectional view taken along line XX in FIG.
FIG. 4 is an exploded perspective view of the bridge telescopic device.
FIG. 5 is a plan view of a bridge expansion and contraction device in a state where the bridge beams facing each other are not relatively moved in the direction perpendicular to the bridge axis.
FIG. 6 is a plan view of a bridge expansion / contraction device in a state in which mutually facing bridge girders are relatively moved in a direction perpendicular to the bridge axis.
FIG. 7 is a partial cross-sectional view of the bridge telescopic device.
FIG. 8 is a cross-sectional view of a prior art bridge telescopic device.
FIG. 9 is a perspective view of a prior art bridge telescopic device.
[Explanation of symbols]
[0020]
H Bridge 1 Foundation member 2 Finger
10 pin
11 Upper plate
12 Lower plate
13 Vertical plate

Claims (1)

A foundation member fixed to the opposite part of the abutment or bridge girder on one side and the bridge girder on the other side, and a plurality of foundation members arranged in a direction perpendicular to the bridge axis in each foundation member, and the abutment or bridge girder on one side and the bridge girder on the other side At least one of the expansion and contraction devices for bridges, wherein the fingers provided on one base member are inserted between adjacent fingers provided on the other base member. The fingers arranged on the foundation member are attached so as to be swingable in a direction perpendicular to the bridge axis with respect to the foundation member, and the fingers and the foundation member are locked by a knock-off member. A telescopic device for bridges.

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