JP2007321334A - Road bridge expansion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road bridge expansion device which prevents separation of a rubber member having both ends thereof pinched by and bonded to metallic mounting members, and prevents upward liberation of the rubber member even if it is separated from the mounting members. <P>SOLUTION: According to the structure of the road bridge expansion device, the mounting members 5, 5 pinching both the ends of the rubber member 2 have side recesses 5b, 5b formed in respective side surfaces abutting on the rubber member 2, and side projections 3, 3 of the rubber member 2 are embedded in the side recesses 5b, 5b, respectively, to thereby enlarge a contact area between the rubber member and the mounting members. Then the rubber member 2 and the mounting members 5, 5 are formed into a unitary body by vulcanizing bonding. As a result, by virtue of engagement between the side projections 3, 3 and the side recesses 5b, 5b, the rubber member 2 is prevented from liberating upward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a road bridge expansion and contraction device, and more particularly, suppresses the peeling of a rubber member that is vulcanized and bonded by sandwiching both ends of a metal mounting member, and rubber even when peeling occurs. The present invention relates to a road bridge expansion and contraction device that can prevent the member from being released upward.

  A gap between the girders of the road bridge and the girders is provided with a gap portion in order to absorb the expansion and contraction of the girders due to temperature changes, and a road bridge expansion and contraction device using a rubber member is installed so as to cover the gap portion. Since this road bridge expansion / contraction device absorbs the expansion and contraction of the girder and is used under harsh conditions in which an automobile or the like passes through the upper surface, damage to the rubber member is particularly severe. Therefore, various road bridge expansion and contraction devices that improve the durability of the rubber member have been proposed (see, for example, Patent Document 1).

  As illustrated in FIGS. 5 and 6, a general conventional road bridge expansion / contraction device 13 is provided with a pair of metal attachment members 5, 5 at both ends of the rubber member 2, and the respective attachment members 5, 5 are provided. Has support portions 5 a and 5 a for supporting the lower surface of the rubber member 2. The rubber member 2 is vulcanized and bonded to the side surfaces of the mounting members 5 and 5 and the support portions 5a and 5a. On the attachment members 5 and 5, anchors (anchor bars or anchor plates) 6 extending in the horizontal direction protrude from the attachment members 5 and 5 at a predetermined interval in the longitudinal direction.

  The telescopic device 13 is bridged so as to cover the space 12 between the girders 7 and 7, and the anchors 6 and 6 projecting from the mounting members 5 and 5, and the floor slabs of the girders 7 and 7, respectively. Reinforcing bars 9 arranged on 8 and 8 and embedded reinforcing bars (not shown) are joined by welding or the like. Next, the post-cast concrete 10 is placed from above the anchors 6 and 6 so as to be flat with the surfaces of the pavement materials 11 and 11, and the telescopic device 13 is installed.

Separation may occur on the adhesive surface between the rubber member 2 and the attachment members 5 and 5 due to aging deterioration, pressure or impact force by a vehicle passing through the upper surface of the rubber member 2, and the like. If the rubber member 2 is peeled off and separated upward as shown by a two-dot chain line in FIG. 5, it will be an obstacle to the traveling vehicle. For this reason, it is necessary to prevent the rubber member 2 and the metal attachment member 5 from being peeled off, and to prevent the rubber member 2 from separating upward even when peeling occurs.
JP-A-10-195809

  The object of the present invention is to suppress the release of a rubber member that is vulcanized and bonded with both ends sandwiched between metal mounting members, and prevents the rubber member from being released upward even when the release occurs. An object of the present invention is to provide a road bridge expansion and contraction device which can be used.

  In order to achieve the above object, a road bridge expansion / contraction device according to the present invention is a road bridge expansion / contraction device in which both ends of a rubber member are sandwiched between metal attachment members and integrated by vulcanization adhesion. A side recess is provided on each side surface in contact with the rubber member, and a side projection to be embedded in the side recess is provided on the rubber member, and the side recess and the side projection are vulcanized and bonded. .

  According to the road bridge expansion and contraction device of the present invention, the side surface concave portions are provided on the respective side surfaces of the rubber members that come into contact with the rubber member of the vulcanized and bonded member with both end portions of the rubber member interposed therebetween, and the side surface concave portions are embedded in the rubber member. Since the side protrusions are provided and the side recesses and the side protrusions are vulcanized and bonded, the bonding area is increased and the adhesive strength is increased, and the peeling of the rubber member can be suppressed. Further, even when peeling occurs, the side recess and the side projection are engaged with each other, so that the rubber member can be prevented from being released upward.

  Hereinafter, the road bridge expansion and contraction device of the present invention will be described based on the embodiments shown in the drawings. The procedure for installing the road bridge telescopic device of the present invention in the play section 12 is the same as that of the conventional road bridge telescopic device 13 illustrated in FIGS. For the same components as 13, the same reference numerals are used.

  As illustrated in FIGS. 1 and 2, the road bridge expansion / contraction device 1 (hereinafter referred to as the expansion / contraction device 1) of the present invention has a plate-shaped rubber member 2 made of vulcanized rubber and having a thickness H, and both ends thereof are made of metal. It is the structure pinched | interposed between the attachment members 5 and 5. On the surface of the rubber member 2, linear grooves 2a and 2a extending in the width direction of the beam 7 (vertical direction in FIG. 2) are provided, so that the longitudinal direction of the beam 7 (horizontal direction in FIG. 2) can be easily expanded and contracted. It is configured to absorb.

  Each attachment member 5, 5 has support portions 5 a, 5 a that support the lower surface of the rubber member 2, and side surface recesses 5 b, 5 b that are recessed in the longitudinal direction of the girder 7 on the side surface in contact with the rubber member 2. is doing. The rubber member 2 is provided with side protrusions 3 and 3 protruding in the longitudinal direction of the beam 7 so as to correspond to the side recesses 5b and 5b.

  The rubber member 2 contacts the side surfaces of the mounting members 5 and 5 and the support portions 5a and 5a so that the side projections 3 and 3 are embedded in the side surface recesses 5b and 5b, and is integrated with the mounting members 5 and 5 by vulcanization adhesion. It is structured. The side projections 3 and 3 and the side recesses 5b and 5b are joined by vulcanization adhesion. In this embodiment, the side protrusions 3 and 3 and the side recesses 5b and 5b are continuously extended in the width direction of the beam 7. However, the side protrusions 3 and 3 and the side recesses 5b and 5b may be divided into a plurality of portions in the width direction of the beam. .

  The rubber member 2 absorbs elastic expansion and contraction in the longitudinal direction caused by temperature changes of the girders 7 and 7 and receives repeated pressure, impact force, and the like by the vehicle passing through the upper surface of the expansion device 1. For this reason, the adhesion surface of the rubber member 2 with the attachment members 5 and 5 is accelerated by these external forces in addition to the deterioration over time.

  In this embodiment, since the side protrusions 3 and 3 are provided on the rubber member 2, the adhesion area with the attachment members 5 and 5 is increased, the adhesion force is increased, and peeling is less likely to occur. Moreover, since the adhesion surface of the side projection 3 embedded in the side recess 5b is protected by the side recess 5b and an external force by the traveling vehicle does not act directly, the promotion of adhesion deterioration is suppressed.

  Even if peeling occurs on the bonding surface between the rubber member 2 and the mounting members 5 and 5, the side protrusions 3 and 3 and the side recesses 5b and 5b are engaged. It is possible to prevent the rubber member 2 from protruding upward and to eliminate the trouble that the rubber member 2 protrudes from the vehicle running surface. Even when the gap portion 12 becomes wider due to the expansion and contraction of the girders 7 and 7, the side projections 3 and 3 project in the longitudinal direction of the girders 7 and 7. 5b can be maintained.

  In addition, if the rubber member 2 has a relatively thin portion with a thickness H, the thin portion of the rubber is relatively quickly damaged by repeated pressure by the vehicle passing through the upper surface of the rubber member 2. In the embodiment, since the side protrusions 3 and 3 do not affect the thickness dimension H of the rubber member 2, the presence of the side protrusion 3 does not adversely affect the durability of the rubber member 2.

  As illustrated in FIG. 3, the side protrusion 3 can be provided with a flange-like enlarged portion 3 a, and the side concave portion 5 b can be formed in a shape that engages by engaging the enlarged portion 3 a. Thus, by providing the side protrusion 3 with the enlarged portion 3a, the adhesion area is further increased and the adhesion force is increased. Moreover, since the expansion part 3a engages with the side surface recessed part 5b when the play part 12 expands, the side surface protrusion 3 can be prevented from being easily detached from the side surface recessed part 5b. The shape of the enlarged portion 3a is not particularly limited as long as the side protrusion 3 can be prevented from coming off from the side recess 5b.

  Further, as illustrated in FIG. 4, the rubber member 2 has an enlarged portion 4 a on the lower surface, provided with a lower surface protrusion 4 that protrudes downward, and a lower surface recess 5 c that fits and engages with the lower surface protrusion 4. Alternatively, the lower surface protrusion 4 and the lower surface recess 5c may be vulcanized and bonded. Thereby, the adhesive force between the rubber member 2 and the attachment member 5 is further increased, and the peeling of the rubber member 2 can be further suppressed. Further, even when the lower surface protrusion 4 is engaged with the lower surface concave portion 5c by the enlarged portion 4a and the separation occurs, it is possible to more reliably prevent the rubber member 2 from being released upward.

  In this embodiment, since the lower surface protrusion 4 does not reduce the thickness dimension H of the rubber member 2, providing the lower surface protrusion 4 does not adversely affect the durability of the rubber member 2.

  The lower surface protrusion 4 and the lower surface recessed portion 5c may extend continuously in the width direction of the beam 7 or may be divided into a plurality of portions in the width direction of the beam.

It is a side view which illustrates the road bridge expansion-contraction apparatus of this invention. It is a top view of FIG. It is an enlarged side view which shows the modification of the A section of FIG. It is an enlarged side view which shows another modification of the A section of FIG. It is a side view which illustrates the conventional road bridge expansion-contraction apparatus. FIG. 6 is a plan view of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road bridge expansion-contraction apparatus 2 Rubber member 2a Groove 3 Side protrusion 3a Enlarged part 4 Lower surface protrusion 4a Enlarged part 5 Mounting member 5a Support part 5b Side surface recessed part 5c Bottom surface recessed part 6 Anchor (anchor bar or anchor plate)
7 Girder 8 Floor slab 9 Reinforcing bar 10 Post-cast concrete 11 Pavement material 12 Spacing section 13 Conventional road bridge expansion and contraction device

Claims (3)

  In a road bridge expansion / contraction device in which both ends of a rubber member are sandwiched between metal attachment members and integrated by vulcanization adhesion, side recesses are provided on the respective side surfaces of the attachment member that contact the rubber member, and the rubber member A road bridge expansion and contraction device provided with side projections embedded in the side recesses and vulcanized and bonded to the side recesses and side projections.   The road bridge expansion and contraction device according to claim 1, wherein the side projection has an enlarged portion, and the side recess is formed in a shape to engage the side projection.   A lower surface protrusion having an enlarged portion is provided on the lower surface of the rubber member, and a lower surface recess that engages with the lower surface protrusion is provided on a support portion of the mounting member that supports the lower surface of the rubber member. The road bridge expansion and contraction device according to claim 1, wherein the two are vulcanized and bonded together.

Images