JP2017066767A - Expansion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion device capable of preventing deformation of a seal layer.SOLUTION: An expansion device 10 provided at a girder end 27 of a bridge comprises a pair of joints 12, and a seal layer 24 that is arranged to close a space between the joints 12. Each of the joints 16 is provided with a support part 26 that is arranged on the downside of the seal layer 24 to prevent deformation of the seal layer 24.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a telescopic device, and more particularly, to a telescopic device provided at the end of a bridge girder.

  The telescopic device is provided at the end of the girder to absorb various displacements of the bridge, mainly the displacement of the length of the bridge girder caused by temperature changes in the environment. This telescopic device is required to have a function of maintaining flatness between the end portions of the girders and preventing permeation of rainwater and the like.

  As such an expansion / contraction device, a device including a pair of joints and a seal layer provided between the joints is disclosed (for example, Patent Document 1). In the said patent document 1, the sealing layer is prevented from jumping out on a road bridge by providing a pressing plate so as to cover the sealing layer.

JP 2004-100150 A

  However, the telescopic device according to Patent Document 1 is used in a cold region, and when the length of the bridge girder contracts, the gap between the girder ends widens, so that snow, earth and sand, etc. enter between the joints and pass further. There is a concern that the holding plate and the seal layer are deformed by the vehicle and the sealing performance is lowered.

  An object of this invention is to provide the expansion-contraction apparatus which can prevent a deformation | transformation of a seal layer.

  An expansion / contraction device according to the present invention is an expansion / contraction device provided at a girder end portion of a bridge, and includes a pair of joints and a seal layer disposed so as to close between the joints, and is disposed below the seal layer. Support portions for preventing deformation of the seal layer are provided in the pair of joints, respectively.

  According to the present invention, when snow is piled up in a state where the gap is widened, and the snow is pushed into the gap by a passing vehicle, the support device disposed below the seal layer receives the load from the snow. Thus, it is possible to prevent the seal layer from being deformed by the snow pressure.

It is a perspective view which shows the whole structure of the expansion-contraction apparatus which concerns on this embodiment. It is a longitudinal cross-sectional view of the expansion-contraction apparatus which concerns on this embodiment. It is a top view of the support part which concerns on this embodiment. It is a top view of the expansion-contraction apparatus which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A telescopic device 10 shown in FIG. 1 is made of steel, and includes a pair of joints 12 having the same length as the width of the bridge girder and a plurality of anchor members 13 provided in the longitudinal direction of the joints 12.

  The joint 12 is made of an inverted L-shaped member, and has a surface portion 14 disposed on the bridge girder surface side, and a belly plate portion 16 formed integrally with the surface portion 14. The surface portion 14 is made of a substantially rectangular plate member having the same length as that of the bridge girder in the width direction (Y direction in the figure), and one side surface in the longitudinal direction (hereinafter referred to as “tip”) is the surface on the other side. It arrange | positions so that the front-end | tip of the part 14 may be opposed.

  The tip of the surface portion 14 is repeatedly formed with irregularities protruding in a comb shape toward the other side. A gap 18 is formed between the tips of the surface portion 14. The gap 18 formed between the tips of the surface portion 14 is formed by combining the irregularities of the surface portion 14. That is, the concave formed on the surface portion 14 of the one joint 12 is paired with the convex formed on the surface portion 14 of the other joint 12, and the convex formed on the surface portion 14 of the one joint 12. , And is paired with a recess formed in the surface portion 14 of the other joint 12. By combining the unevenness formed on the surface portion 14 in this manner, the gap 18 between the tips of the surface portion 14 is formed in a zigzag shape.

  The abdomen plate portion 16 is formed integrally with the base end of the surface portion 14 and is made of a plate member provided at a right angle to the surface portion 14. An anchor member 13 is provided on the outer surface of the abdominal plate portion 16. The anchor member 13 is made of a substantially rectangular plate member, and is provided so as to protrude in parallel with the bridge axis direction (X direction in the drawing) from the surface of the abdominal plate portion 16. The anchor member 13 protects the joint 12 from being damaged by the blade by guiding the blade of the snow removal grader to escape upward after installation.

  As shown in FIG. 2, a dust-proof layer 22 and a seal layer 24 are disposed immediately below the surface portion 14 between the pair of joints 12 in order from the top. A support portion 26 that prevents deformation of the seal layer 24 is provided below the seal layer 24. The dustproof layer 22 is made of an elastic foam such as urethane foam. The foam is not only composed of open cells, but may also be a mixture of closed cells and open cells.

  The seal layer 24 is formed so as to prevent rainwater and the like from penetrating the girder end 27 and to expand and contract following the expansion and contraction of the gap 18. The seal layer 24 can be formed of elastic rubber, stretchable foam, or the like.

  The support portion 26 is a plate member having the same length as the length of the joint 12 in the longitudinal direction, and is provided in each of the pair of joints 12. The support portion 26 is fixed to the inner surface of the abdominal plate portion 16 on one longitudinal side surface. The means for fixing the support portion to the abdominal plate portion is not particularly limited, and may be fixed by welding or a combination of a bolt and a nut. As shown in FIG. 3, the support portion 26 is formed with concavities and convexities protruding in a comb shape on the other side surface in the longitudinal direction (hereinafter referred to as “tip”). That is, the concave formed on one support portion 26 is paired with the convex formed on the other support portion 26, and the convex formed on one support portion 26 is formed on the other support portion 26. Paired with a concave. A zigzag gap 28 is formed between the tips of the support portions 26 by combining the irregularities formed on the support portions 26 in this way. The gap 28 formed by the support portion 26 is different from the gap 18 formed between the tips of the surface portion 14 by ½ in the uneven pitch in the width direction of the bridge girder (Y direction in the drawing). 4).

  The telescopic device 10 configured as described above is fixed to the end portion 27 of the bridge girder, with its longitudinal direction aligned with the width direction of the bridge girder. When the temperature decreases and the bridge girder contracts in the direction of the bridge axis, the clearance t (FIG. 2) between the girder ends 27 increases. As a result, in the telescopic device 10 fixed to the girder end 27, the gap 18 (28) is widened. When the clearance t between the beam ends 27 increases, the dust-proof layer 22 and the seal layer 24 disposed between the joints 12 extend following the expansion between the beam ends 27. Therefore, it is possible to prevent rainwater, dust, and the like that have entered the gap 18 from entering the beam end portion 27.

  Furthermore, when snow accumulates in the state where the gap 18 is widened, and the snow is pushed into the gap 18 by a passing vehicle, the telescopic device 10 receives the load caused by the snow on the support portion 26 disposed below the seal layer 24. As a result, the seal layer 24 can be prevented from being deformed by the snow pressure.

  In the case of the present embodiment, the gap 28 formed between the tips of the support portion 26 is different from the gap 18 formed between the tips of the surface portion 14 by a ½ pitch difference in the width of the bridge girder. Accordingly, since the overlap between the gap 18 of the surface portion 14 and the gap 28 of the support portion 26 can be reduced, the expansion and contraction device 10 can more reliably prevent the seal layer 24 from being deformed.

  When the temperature rises and the bridge girder extends in the direction of the bridge axis, the clearance t between the girder ends 27 becomes narrower. As a result, in the telescopic device 10 fixed to the girder end 27, the gap 18 (28) is narrowed. When the clearance t between the spar end portions 27 is narrowed, the dustproof layer 22 and the seal layer 24 disposed between the joints 12 contract following the contraction between the spar end portions 27. When the seal layer 24 contracts, the lower side is supported by the support portion 26 and thus deforms upward. The dustproof layer 22 provided on the upper side of the seal layer 24 absorbs the deformation of the seal layer 24 to the upper side. Thereby, the expansion-contraction apparatus 10 can prevent the seal layer 24 from jumping out from the gap 18 of the surface portion 14 of the joint 12 to the bridge girder surface.

(Modification)
The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the gist of the present invention.

  In the case of the above embodiment, the support portion 26 has been described with respect to the case where the protrusions and depressions protruding in a comb shape are formed on the side surfaces in the longitudinal direction. However, the present invention is not limited thereto, and the side surfaces in the longitudinal direction are flat without unevenness. Also good.

DESCRIPTION OF SYMBOLS 10 Telescopic device 12 Joint 14 Surface part 18 Crevice 22 Dust-proof layer 24 Seal layer 26 Support part 27 Girder end part 28 Crevice

Claims (3)

In a telescopic device provided at the end of a bridge girder,
A pair of joints;
A seal layer disposed so as to block between the joints,
The expansion and contraction device according to claim 1, wherein a support portion that is disposed below the seal layer and prevents deformation of the seal layer is provided in each of the pair of joints. The pair of joints has a surface portion formed with concavities and convexities protruding in a comb-tooth shape toward the other side,
The telescopic device according to claim 1, wherein the tip of the support portion is formed with an unevenness protruding in a comb shape so as to be opposite to the unevenness of the surface portion. The expansion / contraction apparatus according to claim 2, wherein a dustproof layer is formed between the surface portion and the seal layer.

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