JP2007332689A - Surface cover for highway bridge expansion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface cover for a highway bridge expansion device which can be installed to an existing highway bridge expansion device and is capable of decreasing noise generated when motor vehicles go over the highway bridge expansion device. <P>SOLUTION: A rubber main body portion 2 of a surface cover 1 is placed on a top surface of an expansion device 7; bolts 5a inserted to installing holes 2a of a main body portion 2 are protruded from a bottom surface of the main body portion 2 and screwed to nut portions formed in middle beams 8 of the highway bridge expansion device 7 and a surface cover 1 is fastened and fixed to a top surface of the expansion device 7 thereby reducing the noise caused by contacts or the like between tires of passing cars and many noise suppressing grooves 3 arranged at nonuniform pitches unparalleled to a width direction of girders 11 formed on the surface of the main body portion 2 and also improving the quality of the generated noise by scattering a dominant frequency of the noise. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface cover of a road bridge expansion / contraction device, and more specifically, can be attached to an existing road bridge expansion / contraction device, and can reduce noise generated when a vehicle passes over the road bridge expansion / contraction device. The present invention relates to a surface cover of a road bridge expansion / contraction device.

  A gap between the bridges of the road bridge is provided with a gap portion to absorb the expansion and contraction of the beam due to temperature changes, and an extension device is installed to cover the gap portion. The surface of this expansion / contraction device is formed of metal or rubber, and a groove (gap) parallel to the width direction of the beam is provided in order to cope with the expansion and contraction of the beam. However, when a vehicle traveling on a road bridge passes over the telescopic device, there is a problem that noise is generated due to contact between the groove and the tire. In particular, when the surface of the expansion / contraction device is made of metal, a sound wave that becomes a noise source easily resonates inside the groove, and a large noise is generated.

In order to solve such a problem, a proposal has been made that the surface of the expansion / contraction device is made of rubber, and a concave groove formed with a pattern for reducing noise is provided on the rubber surface (Patent Document 1). reference). When newly installing an expansion / contraction device on a girder, this proposed expansion / contraction device can be used, but a large-scale replacement work is required for the existing expansion / contraction device. For this reason, the existing extension device has a problem that noise reduction measures are not sufficiently taken.
JP 2004-353176 A

  An object of the present invention is to provide a surface cover of a road bridge expansion / contraction device that can be attached to an existing road bridge expansion / contraction device and can reduce noise generated when a vehicle passes over the road bridge expansion / contraction device. It is in.

  In order to achieve the above object, the surface cover of the road bridge expansion and contraction device of the present invention is a surface cover attached to the upper surface of the road bridge expansion and contraction device installed at the seam of the bridge of the road bridge, and the main body formed of rubber A fixing means for the road bridge expansion and contraction device is provided, and a plurality of silencing grooves that are not parallel to the width direction of the girder are formed on the surface of the main body.

  According to the surface cover of the road bridge expansion / contraction device of the present invention, since the fixing means for the road bridge expansion / contraction device is provided in the main body portion formed of rubber, the surface thereof can be replaced without replacing the existing road bridge expansion / contraction device. Can be installed on. In addition, since a plurality of silencing grooves that are not parallel to the width direction of the girder are formed on the rubber surface of the main body, it reduces noise such as air pumping noise that occurs due to contact with the tires of the passing vehicle and the generated noise. It is possible to improve the sound quality by distributing the dominant frequency of the noise and reduce the noise.

  Hereinafter, the surface cover of the road bridge expansion and contraction device of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 and 2, the surface cover 1 (hereinafter referred to as the surface cover 1) of the road bridge expansion and contraction device of the present invention has a plurality of vertically penetrating body portions 2 formed of vulcanized rubber in a plate shape. Mounting hole 2a. A bolt 5a for fixing the front cover 1 to the upper surface of a road bridge expansion / contraction device described later is inserted through the mounting hole 2a. The thickness of the main body 2 is, for example, about 30 mm to 100 mm, and is set to a thickness suitable for the installation location. Examples of rubber types that form the main body 2 include chloroprene rubber (CR), natural rubber, butadiene rubber, and ethylene-propylene-diene monomer copolymer rubber.

  On the surface of the main body 2, a large number of linear sound deadening grooves 3 that obliquely cross are provided. These silencing grooves 3 are not arranged at equal intervals, but are arranged at unequal pitches in a direction perpendicular to the longitudinal direction of the grooves. Moreover, all the silencing grooves 3 have a constant groove depth d1.

  The road bridge telescopic device 7 (hereinafter referred to as the telescopic device 7) for attaching the surface cover 1 extends in the width direction (vertical direction in FIG. 3) of the road bridge girder 11 as illustrated in FIGS. A plurality of middle beam 8 made of metal arranged side by side with a gap in the longitudinal direction of the girder 11 (left and right direction in FIG. 3), and the plurality of middle beams 8 are placed and supported. A plurality of metal support beams 9 are provided. Box portions 10 and 10 having anchors 10a at the lower portions are formed at opposite ends of the respective girders 11 and 11, and each support beam 9 is supported by rubber supports 12 and 12 at the upper and lower ends of both ends. The structure is inserted into the box portions 10 and 10.

  Each middle beam 8 is fixed on a bracket 13 inserted through each support beam 9 with a rubber support 12 interposed, and is disposed on the support beam 9. Further, a waterproof rubber 14 is provided between the surface gaps of the middle beams 8 and 8. Sliding materials are provided on the contact surfaces of the respective rubber supports 12, the middle beam 8, and the support beam 9, so that the middle beam 8 and the support beam 9 can slide.

  The road bridge expansion / contraction device 7 is installed between the girders 11 and 11, and then the box portions 10 and 10 at both ends are fixed with post-cast concrete so as to block the gap portion. A paving material 16 is laid on the surface continuous with the road bridge expansion and contraction device 7.

  In order to attach the surface cover 1 to the upper surface of the expansion / contraction device 7, a screw groove is formed downward from the upper surface of the middle beam 8 of the expansion / contraction device 7 as shown in FIGS. The bolt 5a inserted through the mounting hole 2a of the front cover 1 placed on the upper surface of the expansion device 7 is screwed and fixed to the nut portion 5b.

  An angle or the like having a thread groove may be welded to the middle beam 8 of the telescopic device 7 to provide a nut portion 5b, and a bolt 5a may be screwed into the nut portion 5b. When fastening and fixing, a washer or the like is appropriately interposed. The front cover 1 is attached so as to connect a plurality thereof in accordance with the width direction length of the beam 11. In addition, you may manufacture so that the length of one surface cover 1 may be made into the width direction length of the girder 11 to attach.

  When the front cover 1 is attached, a step is generated on the vehicle running surface. Therefore, in order to eliminate this step, a new pavement material is provided on the post-cast concrete 15 and the pavement material 16 at both ends of the front cover 1. Lay 16a flat. In recent years, since the construction for increasing the thickness of the pavement material 16 has increased, if the surface cover 1 is attached at the time of this construction, the attachment work can be efficiently performed with a minimum of time and cost.

  Thus, in this invention, the surface cover 1 can be installed on the upper surface of the existing expansion-contraction apparatus 7 using the volt | bolt 5a and the nut part 5b, without removing the existing expansion-contraction apparatus 7 and replacing | exchanging.

  Since the silencing groove 3 formed on the surface of the main body 2 of the front cover 1 is not parallel to the width direction of the girder 11, the left and right tires 18 can be moved even if the automobile passes over the silencing groove 3. At the same time, no cavity resonance noise is generated, and noise such as an air pumping sound generated by contact between the silencing groove 3 and the tire 18 is attenuated by reflection cancellation by the silencing groove 3 to reduce the sound pressure level. can do.

  In this embodiment, since the plurality of muffler grooves 3 are arranged at unequal pitches in a direction orthogonal to the longitudinal direction of the grooves, the generated noise frequency is more widely dispersed without concentrating on a specific frequency. It is possible.

  Moreover, since the surface (vehicle traveling surface) of the middle beam 8 is covered with vulcanized rubber by installing this surface cover, it is possible to prevent the traveling vehicle from slipping and to suppress wear deterioration of the expansion device 7 body. it can.

  The silencing grooves 3 are not limited to the above-described embodiment, and can have various specifications (shape, groove width, groove depth, etc.), arrangement, and number of arrangements that have a silencing effect for reducing noise.

  For example, like the surface cover 1 of another embodiment shown in FIGS. 7 and 8, the sound deadening grooves 3a and 3b can be formed in a zigzag shape. The shape of the silencing grooves 3a and 3b in the planar direction may be non-parallel to the width direction of the beam 11 so as to have a silencing effect, and can be various shapes such as a curved shape. Moreover, the shape which makes the some silencer groove | channel 3a, 3b continue, cross | intersects, or branches in the middle may be sufficient.

  In this embodiment, the two silencing grooves 3a and 3b having different groove depths are formed with the groove depths of the silencing grooves 3a and 3b being d2 and d3, respectively. Since the noise attenuation effect and the frequency of attenuation are different depending on the difference in the groove depths d2 and d3, and the sound deadening characteristics are changed. Frequency noise can be reduced. It is preferable to set the groove depths d2 and d3 according to the noise to be reduced. If the groove depths d2 and d3 are non-constant, drainage performance may be reduced. it can.

  A plurality of nuts 5 b are embedded in the main body portion 2 of the front cover 1, and communication holes communicating with the nuts 5 b are formed on the lower surface of the main body portion 2. When this surface cover 1 is attached to the existing expansion / contraction device 7, the surface cover 1 is placed on the expansion / contraction device 7, and a through hole or a through hole provided in the middle beam 8 of the expansion / contraction device 7 is provided through the top and bottom. The surface cover 1 is fastened and fixed by welding an angle or the like to the middle beam 8 and inserting a bolt 5a through the through hole and the communication hole of the main body 2 and screwing it into the nut 5b.

  9 and 10 illustrate another embodiment. The front cover 1 has a linear silencing groove 3 a that obliquely crosses the main body 2 and a bent silencing groove 3 b that intersects the silencing groove 3 a, and expansion and contraction parallel to the width direction of the beam 11. A groove 4 is provided. A natural vulcanized rubber layer 6 is laminated on the lower surface of the main body 2. The main body 2 is provided with a plurality of mounting holes 2a penetrating vertically, and is provided with bolts 5a that pass through the mounting holes 2a and nuts 5b into which the bolts 5a are screwed.

  These two types of silencing grooves 3a and 3b are formed so that the respective groove depths are changed in the longitudinal direction of the grooves, and the silencing characteristics are changed in one of the individual silencing grooves 3a and 3b. Yes. As shown in FIG. 10, the groove depth is changed so that the groove depth is uniformly changed from d4 to d5 from one end to the other end in the longitudinal direction of the silencing groove 3a. Alternatively, the rate of change may be changed along the way. Further, such a change in the groove depth may be applied to all of the silencing grooves 3a and 3b, or may be applied to a part thereof.

  Further, since the surface cover 1 is provided with the expansion / contraction groove 4 parallel to the width direction of the girder 11, the surface cover 1 can easily cope with the expansion / contraction change of the expansion / contraction device 7, and the stress generated in the main body 2 is reduced. Can be made.

  The surface cover 1 includes a natural vulcanized rubber layer 6 on the lower surface of the main body 2 in addition to bolts (bolts) 5a and nuts (nuts) 5b as fixing means for the existing expansion / contraction device 7. . By providing the natural vulcanized rubber layer 6 in this way, the surface cover 1 can be fixed in accordance with various surface shapes of the expansion device 7.

  The surface cover 1 of the present invention can be attached not only to a metal expansion / contraction device 7 but also to a rubber expansion / contraction device 7. The surface cover 1 can be attached to a rubber expansion / contraction device 7. Thus, it is preferable to fix the natural vulcanized rubber layer 6 together with the bolt 5a and the nut 5b.

It is a top view which illustrates the surface cover of the road bridge expansion-contraction apparatus of this invention. It is a see-through | perspective side view of FIG. It is a top view which illustrates the existing road bridge expansion-contraction apparatus. FIG. 4 is a perspective side view of FIG. 3. It is a top view which shows the usage example of the surface cover of the road bridge expansion-contraction apparatus of FIG. FIG. 6 is a perspective side view of FIG. 5. It is a top view which illustrates the surface cover of another road bridge expansion-contraction apparatus of this invention. FIG. 8 is a perspective side view of FIG. 7. It is a top view which illustrates the surface cover of another road bridge expansion-contraction apparatus of this invention. FIG. 10 is a perspective side view of FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface cover of road bridge expansion-contraction apparatus 2 Main-body part 2a Mounting hole 3, 3a, 3b Mute groove 4 Expansion / contraction groove 5a Bolt (bolt part) 5b Nut (nut part)
6 Natural vulcanized rubber layer 7 Road bridge expansion and contraction device 8 Middle beam 9 Support beam 10 Box part 10a Anchor 11 Girder 12 Rubber bearing 13 Bracket 14 Water stop rubber 15 Post-cast concrete 16, 16a Pavement material 17 Spacing part 18 Tire

Claims (7)

  A surface cover to be attached to an upper surface of a road bridge expansion / contraction device installed at a joint of a road bridge girder, provided with a fixing means for the road bridge expansion / contraction device in a main body portion formed of rubber, and the surface of the main body portion A surface cover for a road bridge expansion / contraction device that has a plurality of silencing grooves that are not parallel to the width direction of the girder.   The surface cover of the road bridge expansion and contraction device according to claim 1, wherein the plurality of silencing grooves are arranged at an uneven pitch.   The surface cover of the road bridge expansion and contraction device according to claim 1 or 2, wherein the plurality of silencing grooves are at least two kinds of silencing grooves having different groove depths.   The surface cover of the road bridge expansion and contraction device according to any one of claims 1 to 3, wherein the groove depth is changed in the longitudinal direction of all or some of the plurality of silencing grooves.   The surface cover of the road bridge expansion and contraction device according to any one of claims 1 to 4, wherein the fixing means includes a bolt portion and a nut portion into which the bolt portion is screwed.   The surface cover of the road bridge expansion and contraction device according to any one of claims 1 to 5, wherein the fixing means is constituted by a natural vulcanized rubber layer provided on the lower surface of the main body.   The surface cover of the road bridge expansion / contraction apparatus according to any one of claims 1 to 6, wherein a surface of the road bridge expansion / contraction apparatus is made of metal.

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