JP4220098B2 - Finger type telescopic device for bridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a finger type telescopic device for a bridge, and in particular, prevents a fall accident caused by a tire such as a motorcycle fitted into a gap formed between adjacent comb teeth when the comb teeth are separated. It is related with the finger type expansion-contraction apparatus for bridges.
[0002]
[Prior art]
Girder gaps in bridge structures such as road bridges and pedestrian bridges (hereinafter simply referred to as bridges) expand and contract due to temperature changes, concrete shrinkage due to drying, loads, and the like. In order to allow the vehicle or the like to travel without hindrance to this expansion / contraction, an expansion / contraction device capable of expansion / contraction corresponding to the expansion / contraction of the girder gap is attached between the beams, and the bridge girder gap is blocked by this expansion / contraction device. Has been.
[0003]
As shown in FIG. 5, the bridge expansion and contraction device includes a pair of joint plates 2 composed of a base portion 2A and a meshing portion 2B, which are fixed to face both girders 1 of the bridge, and the comb teeth of the meshing portion 2B. There is known a finger type expansion and contraction device that approaches and separates while 2C is engaged with each other.
[0004]
According to the finger type expansion and contraction device, the comb teeth 2C approach and separate from each other while meshing with each other.
[0005]
[Problems to be solved by the invention]
However, the above-described conventional finger type expansion and contraction device has the following problems. That is, when the comb teeth 2C are separated from each other, a gap (S) is formed between adjacent comb teeth 2C that are not meshed with each other, and a tire of a two-wheeled vehicle such as a bicycle or a motorcycle is fitted into the gap (S), resulting in a fall accident. There was a fear.
[0006]
Accordingly, an object of the present invention is to provide a finger type telescopic device for a bridge in which there is no fear that a tire such as a motorcycle fits into a gap formed between adjacent comb teeth when the comb teeth are separated.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 includes a pair of joint plates, which are fixed to face both girders and are composed of a base portion and a meshing portion in which comb teeth are formed. In the finger-type expansion and contraction device for the bridge that separates, the rear end upper part of the gap formed between the adjacent comb teeth of each of the pair of joint plates is closed by a blind plate, and the upper surface of the blind plate is At the same level as the upper surface of the base of the joint plate and the upper surface of the rear end of the comb teeth, the upper surface of the tip of the comb teeth is continuously inclined downward toward the tip, and thus the comb teeth are mutually connected. When approaching in a meshed state, the tip of the comb teeth and the blind plate do not collide, and when the comb teeth approach and separate, the top surface of the base of the joint plate and the On the blanket Step between the surface and the upper surface of the engagement portion and has a particular feature that does not occur.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a finger type expansion and contraction device for bridges of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is a partial plan view showing a finger type telescopic device for a bridge when approaching a comb tooth portion of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along the line AA of FIG.
[0011]
1 to 4, 1 is a bridge beam, 3 is a pair of joint plates composed of a base portion 3A and a meshing portion 3B on which comb teeth 3C are formed, and 4 is formed between adjacent comb teeth 3C. This is a blind plate that closes the upper part of the rear end of the gap (S). In this example, the length (L2) of the blind plate 4 is about ３ of the total length (L1) of the comb teeth 3C. The meshing portion 3 </ b> B and the blind plate 4 are formed integrally with the joint plate 3.
[0012]
The upper surface of the tip portion of the comb tooth 3C (the portion where the upper portion of the gap S is not blocked by the blind plate 4) is placed at the tip so that the upper surface of the blind plate 4 and the upper surface of the base 3A of the joint plate 3 are at the same level. Inclined continuously downward. That is, if the upper surface of the comb tooth 3C is continuously inclined downward toward the tip, when the comb tooth 3C approaches in a state of being engaged with each other, the tip portion of the comb tooth 3C and the blind plate 4 may collide with each other. This can be avoided, and when the comb teeth 3C approach and separate, there is no step between the upper surface of the base 3A of the joint plate 3, the upper surface of the blind plate 4, and the upper surface of the meshing portion 3B.
[0013]
According to the finger type expansion and contraction device of the present invention configured as described above, it is possible to prevent a tire such as a motorcycle from fitting into a gap formed between the comb teeth as follows. it can.
[0014]
As shown in FIGS. 1 and 2, when the girder gap is narrowed and the comb teeth 3 </ b> C are approaching each other while being engaged with each other, the blind plates 4 also approach each other. In this case, since no gap is formed between the adjacent comb teeth 3C, there is no fear that a tire such as a motorcycle fits in regardless of the presence or absence of the blind plate 4.
[0015]
On the other hand, as shown in FIG. 3 and FIG. 4, when the girder gap is widened and the comb teeth 3 </ b> C are separated from each other, the blind plates 4 are also separated from each other. In this case, a gap (S) is formed between adjacent comb teeth 3C that are not meshed with each other. However, since the upper part of the gap (S) is closed by the blind plate 4, there is no possibility that a tire such as a motorcycle fits into the gap (S).
[0016]
In this way, when the girder gap widens, the possibility that a tire such as a motorcycle fits into the gap (S) formed between the adjacent comb teeth 3C and causes a fall accident is solved.
[0017]
Since the top surface of the tip of the comb tooth 3C is inclined downward toward the tip, the top surface of the blind plate 4 and the top surface of the base of the joint plate 3 are maintained at the same level. There is no fear of coming.
[0018]
【The invention's effect】
As described above, according to the present invention, in the finger-type expansion and contraction device for a bridge provided with a pair of joint plates that are fixed to face both girders and include a base portion and a meshing portion in which comb teeth are formed. Each of the pair of joint plates is formed between the adjacent comb teeth when the comb teeth are separated by closing the upper part of the rear end of the gap formed between the adjacent comb teeth with the blind plate. There is a useful effect that it is possible to prevent a fall accident caused by a tire such as a motorcycle fitted in the gap.
[Brief description of the drawings]
FIG. 1 is a partial plan view showing a finger-type telescopic device for a bridge when a comb tooth portion approaches according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a partial plan view showing a finger type telescopic device for a bridge when the comb tooth part is separated according to the present invention.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a partial plan view showing a conventional finger-type expansion device for a bridge.
[Explanation of symbols]
1: Girder 2: Joint plate 2A: Base portion 2B: Engagement portion 2C: Comb teeth 3: Joint plate 3A: Base portion 3B: Engagement portion 3C: Comb teeth 4: Blind plate

Claims (1)

A finger-type expansion and contraction device for a bridge, which includes a pair of joint plates each having a base portion and a meshing portion formed with comb teeth, which are fixed to face both girders, and which approaches and separates when the comb teeth mesh with each other. In
The upper part of the rear end of the gap formed between the adjacent comb teeth of each of the pair of joint plates is closed by a blind plate, and the upper surface of the blind plate is the upper surface of the base portion of the joint plate and the comb teeth. When the upper surface of the tip of the comb teeth is continuously inclined downward toward the tip, and thus the comb teeth approach each other while being engaged with each other, The tip of the comb teeth and the blind plate do not collide, and when the comb teeth approach and separate, the upper surface of the base of the joint plate, the upper surface of the blind plate, and the upper surface of the meshing portion A finger-type expansion and contraction device for bridges, characterized in that no step is generated between them .

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