JP4048647B2 - Telescopic device for bridge joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic device for a bridge joint.
[0002]
[Prior art]
Japanese Patent Publication No. Sho 52-32173 is a lightweight telescopic device that can sufficiently follow a large amount of expansion and contraction of a bridge joint, is completely waterproof and dustproof, and does not cause unevenness on the road surface during rotation. Proposed in the issue.
[0003]
As shown in FIG. 5, the telescopic device has a lower end pivotally connected to each other by a pin 1aa, and an upper end is pivotally attached to the ends of the bridge end members 2a and 2b opposite to each other by end pins 6a and 6b. The V-shaped link 1a and the lower ends of the V-shaped links 1a are pivotally connected to the respective central portions by pins 1ba, and the upper ends of the V-shaped links 1a are at the same height as the upper-end pivoting portions of the V-shaped links 1a. A link mechanism 1 composed of an inverted V-shaped link 1b pivotally attached by means of is provided with a predetermined interval in the width direction between the facing bridge end members 2a, 2b, and the shaft 1bb of the inverted V-shaped link 1b. Further, the distal ends of the fingers 3a and 3b pivotally attached to the bridge end members 2a and 2b are alternately placed on the bridge end members 2a and 2b, and the support members 4 are provided on the fingers 3a and 3b. Arranged the flexure plate 5 It is formed.
[0004]
[Problems to be solved by the invention]
However, since the expansion device having the conventional structure described above is configured to support the load acting on the fingers by the link mechanism, a large space is required in the height direction. In addition, some telescopic devices that suppress the space in the height direction use only the fingers, but such telescopic devices can follow displacements in directions other than the bridge axis generated in the bridge. Can not.
[0005]
The present invention has been made in view of the above-described conventional problems, does not require a large space in the height direction, and can sufficiently follow displacement in directions other than the bridge axis. It aims to provide a telescopic device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the expansion device for the bridge joint according to the present invention is:
Composed of a pair of fingers and a crossing girder that form a set by overlapping one and the other in a comb-like shape,
While forming the fingers is fixed to one of the bridge girder ends, the other located at the top side, the sliding is found provided so as to freely bridge axis direction to the bridge girder ends,
The crossing girder is connected to the tip end side of the finger via a universal joint, and the base end side is connected to the other bridge girder end portion via the universal joint. By doing so, a large space is not required in the height direction, and the displacement in the direction other than the bridge axis can be sufficiently followed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The expansion device of the bridge joint according to the present invention is
An expansion device for a bridge joint interposed between the ends of facing bridge girders,
Composed of a pair of fingers and a crossing girder that form a set by overlapping one and the other in a comb-like shape,
While forming the fingers is fixed to one of the bridge girder ends, the other located at the top side, the sliding is found provided so as to freely bridge axis direction to the bridge girder ends,
The crossover digits, the coupled tip side through a universal joint to the distal end side of the finger, the proximal is Tei shall be connected via a universal joint to the other bridge girder ends.
[0008]
In the expansion device of the bridge joint according to the present invention, the displacement in the direction of the bridge axis is absorbed by the sliding of the finger tip, and the displacement in the direction other than the bridge axis is caused by the universal joints provided at both ends of the bridge girder. Absorb.
[0009]
【Example】
Hereinafter, a telescopic device for a bridge joint according to the present invention will be described based on an embodiment shown in FIGS.
1 is a side view when the expansion device for a bridge joint according to the present invention is installed, FIG. 2A is a view of FIG. 1 viewed from the plane direction, FIG. 1B is a partially enlarged view of FIG. 1 is the same view as FIG. 1 when displaced in the direction of the bridge axis, FIG. 4A is the same view as FIG. 1 when displaced in the direction perpendicular to the bridge axis, and FIG. FIG.
[0010]
In FIG. 1 to FIG. 4, reference numeral 11 denotes a horizontal beam having the same width as a later-described finger 14, and is fixed on a gantry 12 fixedly disposed on a bridge girder A via a lower bar 13, for example.
Reference numeral 14 denotes a pair of fingers formed in a pair with a certain number of combs, and one side 14a arranged on the base end side has the same width as the lateral beam 11 and the finger 14 as in the case of the horizontal beam 11. And fixed to a leg member 22 fixed on a base 12 fixedly arranged on a bridge girder A via a lower rod 13. Further, the other 14b arranged on the front end side is slidable on the lower rod 13 on the gantry 12 via the upper rod 15 attached to the back surface of the leg member 22 fixed to both ends. Is placed.
[0011]
Reference numeral 16 denotes a gantry having the same width as that of the finger 14 as in the case of the cross beam 11 and the leg member 22 described above. A universal joint 17 is attached to the surface of the gantry 16 facing the bridge beam A.
[0012]
Reference numeral 18 denotes a crossing girder having leg members 22 fixed to both ends in the same manner as the other 14b of the finger 14 described above, and the base end side is mounted on a base 16 fixed to the abutment B via a spherical support member 20, The side is placed on the lower rod 13 on the upper surface of the gantry 12 fixed to the bridge girder A so as to be slidable through the upper rod 15. In addition, the crossing girder 18 is attached on the distal end side to the distal end side of the other 14 b of the finger 14 via the universal joint 19, and is connected to the universal joint 17 on the proximal end side.
[0013]
In addition, in the expansion device of the bridge joint according to the present invention, the overlap amount of one finger 14a and the other 14b of the finger 14 in the initial setting state and the overlap amount of the crossing girder 18 with respect to the gantry 12 are the expansion amount to be absorbed. Needless to say, it is set accordingly.
[0014]
The expansion device of the bridge joint according to the present invention has the above-described configuration. When displacement occurs in the direction of the bridge axis, that is, when the distance between the horizontal beam 11 and the gantry 16 on the abutment B varies, FIG. As shown, the other 14b located on the distal end side slides on the lower rod 13 and moves in the bridge axis direction by the action of the finger 14. This amount of movement is absorbed by the amount of overlap of the fingers 14.
[0015]
On the other hand, displacements in directions other than the bridge axis are absorbed by the action of the universal joints 17 and 19 that connect both ends of the crossing girder 18. For example, FIG. 4 is a view showing a case where the displacement is 250 mm in a direction perpendicular to the bridge axis. For such a displacement in a direction other than the bridge axis, the two universal joints 17 and 19 cause the displacement in FIG. As shown in b), the displacement girder 18 is inclined to absorb the displacement.
[0016]
In this embodiment, even when the crossing girder 18 is tilted in this way, the distance between the one side of the crossing girder 18 that is separated in the bridge width direction and the other 14a of the finger 14 and the mount 16 is not increased. 2 and 4 (b), both ends of the crossing girder 18 are formed in a saw blade shape, and the end surface of the gantry 16 facing the base end of the crossing girder 18 is defined as the tip of the crossing girder 18. The shape is the same as that of the other 14 b of the opposing fingers 14. Thus, when the crossing girder 18 is tilted, the other side saw blade-like portion of the crossing girder 18 approaching in the bridge width direction comes to mesh with the other 14b of the finger 14 and the end face of the gantry 16. The space | interval with the other side 14a of the finger | toe 14 and the mount frame 16 can be made small.
[0017]
Moreover, in the expansion device of the bridge joint according to the present invention, for example, when a connecting bridge is provided in the landfill, when the landfill sinks and the play distance increases, as shown in FIG. Moreover, since it can cope by inserting the block 21 between the mount frame 16 and the abutment B, the dimension of the whole expansion-contraction apparatus can be made small.
[0018]
【The invention's effect】
As described above, according to the expansion device of the bridge joint according to the present invention, by adopting the above configuration, without increasing the height of the entire expansion device, for displacement in the direction of the bridge axis, With the amount of finger overlap that forms a pair, and displacement in directions other than the bridge axis, two universal joints can follow. Therefore, the surrounding scenery is not impaired, and it is optimal for protecting the scenery around the road.
[Brief description of the drawings]
FIG. 1 is a side view when an expansion device for a bridge joint according to the present invention is installed.
2A is a diagram of FIG. 1 viewed from a plane direction, and FIG. 2B is a partially enlarged view of FIG.
FIG. 3 is a view similar to FIG. 1 when displaced in the direction of the bridge axis.
4A is a view similar to FIG. 1 when displaced in a direction perpendicular to the bridge axis, and FIG. 4B is a view of FIG.
FIG. 5 is a front view showing a partial cross-sectional view of a conventional expansion device for a bridge joint.
[Explanation of symbols]
A Bridge girder B Abutment 14 Finger 17 Universal joint 18 Transition girder 19 Universal joint

Claims (1)

An expansion device for a bridge joint interposed between the ends of facing bridge girders,
Composed of a pair of fingers and a crossing girder that form a set by overlapping one and the other in a comb-like shape,
While forming the fingers is fixed to one of the bridge girder ends, the other located at the top side, the sliding is found provided so as to freely bridge axis direction to the bridge girder ends,
The crossover digits, the fingers are connected the front end side through a universal joint to the distal end side of the base end side extension device bridge joint, characterized in Tei Rukoto linked via a universal joint to the other bridge girder ends .

Images