JPH11315506A - Crossover beam expansion device of bridge joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crossover beam expansion device of a bridge joint with out requiring any large space in the direction of the height. SOLUTION: A crossover beam expansion device is equipped with fingers 14a and 14b fixing the basic end sides to end horizontal beams 11a and 11b pivoted on bridge girders 12a and 12b opposed to each other and positioned in a state of engagement by overlapping their front end sides, an intermediate horizontal beam 16 for bearing the front end sides of the fingers 14a and 14b from below, a crossover beam 18 fixing the intermediate horizontal beam 16 to the central part and constructed between the bridge girders 12a and 12b in a slidingly movable manner and a four joint link mechanism 19 having both ends mounted to the end horizontal beams 11a and 11b as well as the center mounted to the intermediate horizontal beam 16 in order that the intermediate horizontal beam 16 is always positioned at the center between the bridge girders 12a and 12b. By the constitution, even in the case it is made to follow a large amount of expansion, the overall height of the expansion device becomes short.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge-type expansion / contraction device for a bridge joint used as a road expansion / contraction device for a long bridge.

[0002]

2. Description of the Related Art The applicant of the present invention has developed a lightweight telescopic device which 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 a road surface when rotating. It was proposed in Japanese Patent Publication No. 52-32173.

As shown in FIG. 5, this telescopic device has a V-shaped link 1a pivotally connected at its lower ends to each other by pins 1aa, and at its upper ends to opposing ends of connecting members 2a and 2b by pins 1ab, respectively. An inverted V-shape in which the lower end is pivotally connected to each central portion of the V-shaped link 1a by a pin 1ba, and the upper end is pivotally connected to each other by an axis 1bb at the same height as the upper end pivoted portion of the V-shaped link 1a. Mold link 1
b is connected to the connecting members 2a,
Each finger 3 having a base end pivotally connected to the connection member 2a, 2b on the shaft 1bb of the inverted V-shaped link 1b, while providing a predetermined interval in the width direction between the two members 2b.
The configuration is such that the distal ends of a and 3b are alternately placed, and a flexible plate 5 is arranged on these fingers 3a and 3b via a support member 4.

[0004]

However, in the telescopic device having the above-mentioned structure, since the structure from the time of maximum expansion to the time of minimum contraction is absorbed by a set of V-shaped links 1a, it is large in the height direction. Space was needed.

In addition, with the recent development of bridge technology, the amount of expansion and contraction required for expansion and contraction devices is increasing.
In the above structure, the link mechanism becomes larger in proportion to the increase or decrease in the amount of expansion and contraction, so a larger space is required in the height direction, and it becomes difficult to apply it to bridges with small girder heights such as continuous girder bridges. Was.

[0006] The present invention has been made in view of the problems inherent in the above-described conventional link-type telescopic device,
It is an object of the present invention to provide a crossover type telescopic device for a bridge joint that does not require a large space in the height direction.

[0007]

In order to achieve the above-mentioned object, a bridging type telescopic device for a bridge joint according to the present invention has a base end side fixed to an end cross beam, and each end side is overlapped. The distal end side of the finger positioned in a meshing manner is supported from below by an intermediate cross beam, and this intermediate cross beam is fixed to a central portion of a cross beam slidably suspended between bridge girders, and the intermediate cross beam is fixed. The center holding mechanism always positions it at the center between the bridge girders. And in this way, without requiring a large space in the height direction,
It can follow large expansion and contraction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A crossover type telescopic device according to the present invention has a base end fixed to an end cross beam pivotally connected to an opposed bridge girder, and each of the front ends overlaps and meshes. , A cross beam that supports the distal ends of the fingers from below, a cross beam that is fixed to the center portion of the middle cross beam, and that is slidably and slidably bridged between the bridge girders, In order to always position the intermediate cross beam at the center between the bridge girders, a center holding mechanism attached between the end cross beam and the intermediate cross beam is provided.

[0009] According to the crossover type telescopic device of the present invention, the load acting on the distal end side of the finger is supported by the crossover beam, not the conventional link mechanism, via the intermediate cross beam. Does not require a large space in the height direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bridge type telescopic device according to the present invention will be described with reference to an embodiment shown in FIGS. FIG.
FIG. 2 is a front view of a bridge type telescopic device of the present invention, FIG.
1 is a plan view excluding the fingers of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. 4 is a plan view showing one block of the fingers constituting the bridging beam type telescopic device of the present invention.

In FIG. 1 to FIG. 4, reference numerals 11a and 11b denote end cross beams having a length adapted to the width of the bridge, for example, via bridge joints 12a and 12b provided opposite to the joint of the bridge via a universal joint 13, for example. Is pivoted. Insertion portions 11aa, which guide a cross beam 18 described later, are provided at predetermined positions on the bottom surfaces of these end cross beams 11a, 11b.
11ba is provided.

As shown in FIG. 4, for example, a pair of fingers 14a and 14b are formed as a set of a fixed number of combs.
b, for example, with a bolt 15, and the distal end side is formed so as to overlap and mesh with each other. Then, an appropriate number of comb-shaped fingers 14a and 14b forming the pair are arranged in parallel so as to have a length suitable for the bridge width.

Numeral 16 denotes an intermediate cross beam for supporting an appropriate number of the pair of fingers 14a, 14b, which are arranged in parallel, from the lower end thereof, and the above-mentioned end cross beams 11a, 1a.
It has a length that matches the bridge width as in 1b.

Reference numeral 18 denotes a cross beam to which the intermediate cross beam 16 is fixed at the center thereof, which supports a load acting on the intermediate cross beam 16 via the fingers 14a and 14b.
The transition beam 18 is connected to the above-described insertion portions 11aa and 11ba.
On the shoe 17 provided on the projecting portions 12aa, 12ba formed opposite to the bridge girders 12a, 12b.
It is suspended over the end cross beams 11a and 11b and the intermediate cross beam 16 so as to be freely slidable in the right angle direction.

Reference numeral 19 denotes a four-node link mechanism in which one vertex of a quadrilateral having the same length on each side is shared by adjacent quadrilaterals, for example, four in a row are arranged in series. The pivot point 19a is pivotally attached to the end cross beams 11a and 11b, and the central pivot point 1 in which a center adjacent quadrilateral is common.
9b is pivotally attached to the intermediate cross beam 16 so that the intermediate cross beam 16 is always located in the center between the bridge girders 12a and 12b.

The fingers 13a, 13 in the initial setting state of the crossover type telescopic device of the bridge joint according to the present invention.
b The amount of overlap on the tip side and the amount of overlap on the bridge girder 12a, 12b side of the cross beam 18 on the shoe 17 are:
Needless to say, the setting is made according to the amount of expansion and contraction to be absorbed.

The bridge-type expansion / contraction device according to the present invention has the above-described structure, and has fingers 14a and 14 that absorb the expansion and contraction amount based on the change in the distance between the bridge girders 12a and 12b.
The load acting on the tip side of b is supported by the cross beam 18 via the intermediate cross beam 15. At this time, the load acting on the cross beam 18 is transmitted to the end cross beams 11a and 11b, so that the negative reaction force generated on the base end side of the fingers 14a and 14b is effectively suppressed. Therefore, even when the vehicle is running, the fingers 14a and 14b do not flutter. At the time of absorbing the amount of expansion and contraction, the intermediate cross beam 15 is connected to the four-bar linkage 19.
Is always located in the middle between the bridge girders.

In this embodiment, the four-link mechanism 19 which does not require power is used as the center holding mechanism. However, if the same action is performed, an elastic member such as a spring may be used. , Adopt a hydraulic cylinder,
It goes without saying that design changes such as adoption of other well-known mechanisms are also possible.

Further, in this embodiment, in order to facilitate the assembling operation, a case where a fixed number of fingers 14a and 14b formed as a set are used is disclosed. They may be arranged in a shape.

[0020]

As described above, in the crossover type telescopic device according to the present invention, the load acting on the tip side of the finger is supported at the neutral position of the crossover beam via the intermediate cross beam, and Since the link mechanism is not supported by the link mechanism as in the case of the link mechanism, the height of the entire telescopic device is reduced even when following a large amount of expansion and contraction.

Therefore, the present invention can be sufficiently applied to a bridge having a low girder height and requiring a large amount of expansion and contraction.
It does not impair the surrounding landscape and is also useful for protecting the landscape along the road.

[Brief description of the drawings]

FIG. 1 is a front view of a bridge type telescopic device of a bridge joint according to the present invention.

FIG. 2 is a plan view of FIG. 1 excluding fingers.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a plan view showing one block of a finger that constitutes a crossover type telescopic device of a bridge joint according to the present invention.

FIG. 5 is a front view showing a cross section of a conventional expansion / contraction device for a bridge joint.

[Explanation of symbols]

 11a End cross beam 11b End cross beam 12a Bridge girder 12b Bridge girder 14a Finger 14b Finger 16 Intermediate cross beam 18 Cross beam 19 Four-joint link mechanism

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fujio Suzuki 4-33, Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd. (72) Inventor Kiyoshi Nakayama 5-1-1 Shimaya, Konohana-ku, Osaka-shi, Osaka No. 109 Sumikin Kansai Industry Co., Ltd.

Claims (1)

[Claims] A finger fixed at its base end to an end cross beam pivotally connected to an opposed bridge girder, each of which has a distal end that is overlapped and meshes with each other; An intermediate cross beam supported from below, a cross beam fixed to the center of the intermediate cross beam, and slidably suspended between the bridge girders; and an end cross beam so that the intermediate cross beam is always positioned at the center between the bridge girders. A crossover type telescopic device for a bridge seam, comprising a center holding mechanism mounted between the bridge and the intermediate cross beam.