JP2010013802A - Soundproof structure and soundproof construction of steel girder bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproof structure and a soundproof construction of a steel girder bridge, which enable drainage in rainfall, which do not cause a deterioration in an acoustical insulation board and rust development, which can avoid an influence of an increase in weight, which can cope with noises at a wide range of frequencies, and which can exert an effect on insulation against a noise source below the steel girder bridge. <P>SOLUTION: This soundproof structure 1, which can be arranged between steel girders juxtaposed in parallel so as to constitute the steel girder bridge, has a basic structure in which sound absorbing layers (upper and lower sound absorbing layers 31 and 32) composed of a sound absorbing material such as a porous plate and a fibrous mat are interposed on and under a sound insulating board 2 composed of a metal plate etc. In the characteristic structure, the sound insulating board 2 is provided with drainage channels 21 and 22 which are opened upward from one end to the other one, so that rainwater received by the top surface of the soundproof structure 1 can be discharged to the outside; and a sound-absorbing air space 4 is provided in parallel with the drainage channels 21 and 22 between the sound insulating board 2 and the lower sound absorbing layer 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a soundproof structure used for a steel girder bridge and an improvement of a steel girder bridge soundproof structure.

  Conventionally, a steel girder bridge is constructed by arranging steel girders in parallel. These steel girder bridges, especially railway bridges, are noisy during vehicle travel compared to ordinary concrete bridges, so noise insulation plates are installed on the side and bottom to prevent noise diffusion. . For example, Patent Document 1 discloses a structure in which a sound insulation sheet having a bending rigidity such as rubber or soft plastic is attached to the lower surface of a steel girder as a soundproof structure for a lower region of a steel girder used for a railway bridge. It is disclosed.

  In this soundproof structure, it has been proposed to effectively insulate a specific frequency range by selecting a bending rigidity value of the sound insulation sheet. However, in the case of such a steel girder bridge soundproofing facility, the upper surface is usually open to the open-air, so when raining, rainwater that has fallen on the sound insulation plate below stays in the metal frame and support frame. Therefore, it was necessary to attach a separate drainage structure. In addition, in the soundproof structure of only the sound insulation plate as in Patent Document 1, it is difficult to cope with a wide range of noise, or when there is a noise source of other transportation below the steel girder bridge, There were problems such as reflecting and diffusing the noise around.

JP 2003-342912 A: Claims, FIGS. 2, 3, 4, 5, etc.

  The present invention was made in order to solve the above problems, and relates to a soundproof structure disposed between steel girders provided to a steel girder bridge, which can be drained during rainfall, The effect of weight increase can be avoided without causing deterioration and rusting of the soundproof board. Further, the present invention provides a soundproof structure and a steel rope girder bridge soundproof structure that can cope with noises of a wide range of frequencies and can be expected to be effective for soundproofing a noise source below the steel girder bridge.

The above problem is a soundproof structure that is formed by laminating sound absorbing layers on the top and bottom of a sound insulation plate, and can be arranged between steel girders that constitute a steel girder bridge in parallel, This can be solved by providing a drainage groove that opens upward from one end to the other, and allowing rainwater received on the top surface of the soundproof structure to be drained to the outside.
Further, by providing a sound absorbing air layer in parallel with the drainage groove between the sound insulating plate and the lower sound absorbing layer, an effect can be expected for sound insulation of a noise source below the steel girder bridge.

  Further, according to the present invention, the drainage groove is provided at one side edge portion of the sound insulation plate having a rectangular planar outer shape, and a bent portion is provided at the upper end portion of the outer wall plate of the drainage groove, and a plurality of the soundproof structures are provided. When arranged side by side, the end portion of the other side edge portion of the sound insulation plate of the adjacent soundproof structure can be covered with the bent portion, or the bent portion is provided at the end portion of the other side edge portion. When a plurality of the soundproof structures are provided and arranged in a row, the upper end portion of the outer wall plate of the drainage groove of the adjacent soundproof structures can be embodied by the bent portion.

  Furthermore, the present invention provides the drainage groove on both opposing side edges of the metal sound insulation plate, and also provides a bent portion at the upper end of the outer wall plate of the one drainage groove. When a plurality are arranged in a row, it is preferably embodied in a form in which the outer wall plate upper end portion of the other drainage groove provided in the adjacent soundproof structure can be covered with the bent portion.

  In the present invention, at least the upper sound absorbing layer of the sound absorbing layer is constituted by a sound absorbing material covered with a water repellent film, and a perforated plate is provided on the upper surface of the upper sound absorbing layer and the lower surface of the lower sound absorbing layer. It is preferable to attach the sound absorbing layer, the sound insulating plate, the drainage groove, the air layer, and the perforated plate to form a soundproof structure in which the soundproof plate unit is formed.

Moreover, said problem is solved by the steel girder bridge sound-insulation structure of the following this invention. That is, the steel girder bridge soundproofing structure is characterized in that the soundproofing structures of the above-mentioned respective forms are arranged between opposing steel girders constituting the steel girder bridge.
Further, the steel girder bridge soundproof structure is characterized in that a support material is fixed to the steel girder and the soundproof structure is bridged between the support materials.
In particular, the steel girder is an I-shaped steel girder, and a support member having an L-shaped cross section is fixed to the I-shaped steel girder in the direction of the girder, and the soundproof structure is bridged between the support materials. Preferably, the steel girder bridge soundproof structure is used.

  The soundproof structure of the present invention can prevent the diffusion of noise such as vehicles passing through a steel girder bridge, and has a drainage groove that can drain rainwater even if it is placed on an open-air, so that it can be drained when it rains. It is possible to avoid the influence of the weight increase of the sound absorbing material due to water immersion without causing deterioration of the sound absorbing material and rusting of the metal member. Furthermore, since it also has a sound absorbing space inside, it can handle a wide range of noises. Since there is a sound-absorbing layer on the lower side, it is also effective for soundproofing the noise source below the steel girder bridge. In addition, it is possible to provide a steel girder bridge soundproof structure easily by unitization, and it has excellent effects. Therefore, the present invention has extremely high practical value as a soundproof structure and a steel girder bridge soundproof structure that have solved the conventional problems.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 5 in the order of the soundproof structure and the steel girder bridge soundproof structure.
(Soundproof structure)
A soundproof structure 1 according to the present invention is a soundproof structure 1 that can be disposed between steel girders that constitute a steel girder bridge in parallel with each other. The basic structure is a structure in which sound absorbing layers (upper sound absorbing layer 31 and lower sound absorbing layer 32) made of a sound absorbing material such as a plywood or fiber mat are laminated.

(First Embodiment)
As shown in FIG. 1, the characteristic structure is that the sound insulating plate 2 is provided with drain grooves 21 and 22 having a substantially U-shaped cross section that opens upward from one end to the other end. The rainwater received on the upper surface of the slab can be drained to the outside, and the sound absorbing air layer 4 is provided in parallel with the drain grooves 21 and 22 between the sound insulating plate 2 and the lower sound absorbing layer 32. The drain grooves 21 and 22 are not limited to a substantially U-shaped cross section, and a shape such as a substantially U-shaped cross section can be adopted as long as there is a certain depth constituting the sound-absorbing air layer 4.

  The structure shown in FIG. 1, FIG. 2 and FIG. 3 (A) has a metal sound insulating plate 2, such as a sound insulating plate 2 made of a galvanized steel plate having a thickness of 1.6 mm. Is provided with a drainage groove 21 having a substantially U-shaped cross section that is open upward and is composed of an inner wall plate 21a, a bottom plate 21b, and an outer wall plate 21c. Drain grooves 22 (inner wall plate 22a, bottom plate 22b, outer wall plate 22c) are provided.

  Thus, since the flat plate portion 23 of the sound insulating plate sandwiched between the drainage grooves 21 and 22 is positioned higher than the drainage grooves 21 and 22, rainwater received on the upper surface of the soundproof structure 1 is guided to the drainage grooves 21 and 22. The water is collected and can be drained to the outside. At the same time, deterioration of the sound absorbing material constituting the upper sound absorbing layer 31 based on water immersion and rusting of other metal members can be prevented, and the influence of an increase in weight of the sound absorbing material can be avoided.

Further, the flat plate portion 23 of the sound insulating plate sandwiched between the drain grooves 21 and 22 is laminated in close contact with the upper sound absorbing layer 31, and the lower sound absorbing layer 32 disposed at both ends in contact with the back surface of the bottom plates 21b and 22b. A space 4 having an interval corresponding to the depth of the drain grooves 21 and 22 is arranged between the two, and this space is combined with the presence of the lower sound absorbing layer 32, and in particular, the sound absorbing performance with respect to a low frequency. There is an action to improve.
When the sound absorbing space is not effective for the frequency of noise from below, the sound absorbing space can be filled with a sound absorbing material to form a sound absorbing layer.

  In the embodiment of FIG. 3 (A), gaps t1 and t2 are provided between the end surface of the upper sound absorbing plate 31 and the outer wall plates 21c and 22c of the drain grooves 21 and 22. It is better to leave some water in the water collection, but if it is too large, there is a risk that the soundproofing performance may be lowered.

  Furthermore, in this first embodiment, a bent portion 21d that is bent laterally outward is provided at the upper end portion of the outer wall plate 21c of one drainage groove 21, and a plurality of these soundproof structures 1 are arranged in a row and made of steel. When the girder bridge soundproof structure is configured, it is possible to cover the upper end portion of the outer wall plate 22c of the other drainage groove 22 provided in another soundproof structure disposed adjacent to the soundproof structure with the bent portion 21d. Is appropriate. At this time, if the upper surface of the upper sound absorbing plate 31 is at a position lower than the upper end of the outer wall plate 22c and a gap is provided between the upper sound absorbing plate and the bent portion 21d, rainwater collects in the drain grooves 21 and 22. It is easy to be watered and is preferable.

  Thus, when a plurality of soundproof structures 1, 1 are arranged in a row, the rainwater received on the upper surface of the soundproof structure 1 can be collected in the drain grooves 21, 22 without leaking from the gap between the two soundproof structures. Is obtained. For this purpose, it is also preferable to form the bent portion 21d in a substantially inverted U shape so as to sandwich the upper end portion of the outer wall plate 22c of the other drainage groove 22.

(Second Embodiment)
In the second embodiment illustrated in FIG. 3B, the drainage groove 21 is provided on one side edge portion along the longitudinal direction of the sound insulating plate 2 having a rectangular planar outer shape, and the outer wall plate of the drainage groove 21. A bent portion 21d that is bent laterally outward is provided at the upper end portion of 21c. This structure is similar to that shown in FIG.
When a plurality of these soundproof structures are arranged in a row, the other side edge of the sound insulating plate 2 of the adjacent soundproof structure (the drainage groove is not provided unlike the previous FIG. 3A). The bent wall plate 24 bent upward is formed so that the bent portion 21d can cover the distal end portion thereof.

In this case, thus, in this embodiment, the drainage groove 21 is provided only on one side of the sound insulating plate 2, but the rainwater received on the upper surface of the sound insulating structure 1, 1 is the soundproof structure 1, 1. The water can finally be collected in the drain groove 21 without leaking from the gap.
Even in this case, the spacer 25 is mounted between the sound insulating plate 2 and the lower sound absorbing layer 32 on the other side edge of the sound insulating plate 2 where no drainage groove is provided, and the sound absorbing space 4 is the first embodiment. Are formed at the same interval.
Further, it is preferable to provide the flat plate 23 with an inclination toward the drain groove 21 because water can be easily collected.

(Third embodiment)
In 3rd Embodiment illustrated in FIG.3 (C), while providing the drainage groove 21 in one side edge part along the longitudinal direction of the sound-insulating board 2 whose plane external shape becomes a rectangle, the other side edge part (front-end) 3 (A), a drainage groove is not provided), a bent portion 24d in the lateral direction is provided at the tip of the bent wall plate 24 bent upward, and a plurality of the soundproof structures 1, 1 are provided. When arranged in a row, the upper end portion of the outer wall plate 21c of the drainage groove 21 in the adjacent soundproof structure can be covered with the bent portion 24d.
That is, in the second embodiment, instead of omitting the bent portion 21d in FIG. 3B, a bent portion 24d is provided on the opposite side as shown in FIG. It is arranged to be obtained. Accordingly, the other structure is the same as that of the second embodiment, and thus the description thereof is omitted.

In each of the embodiments described above, the sound absorbing layer 31 is preferably made of a sound absorbing material made of polyester fiber covered with a water repellent fluororesin film so as to have a thickness of about 25 mm, because preferable sound absorbing performance and water resistance performance can be obtained. is there. The same structure can be adopted for the lower sound absorbing layer 32, but it may be composed of only a sound absorbing material made of polyester fiber having a thickness of about 25 mm. In addition, as these water-repellent films and sound-absorbing materials, other known ones can be used.
In addition, perforated plates 51 and 52 are attached to the upper surface of the upper sound absorbing layer 31 and the lower surface of the lower sound absorbing layer 32 to help protect the sound absorbing layers 31 and 32. From the viewpoint of handling of the sound absorbing structure, it is preferable to integrate the plate 2, the drainage groove 21 (22), the air layer 4, and the perforated plates 51 and 52 to form a soundproof plate unit. In this case, as the perforated plates 51 and 52, a plate material provided with a large number of ventilation holes on the top and bottom, such as a stainless steel wire mesh having the appropriate thickness, the expanded metal, the punching metal, and the grating can be used.

(Steel girder bridge soundproof structure)
The steel girder bridge soundproof structure of the present invention will be described with reference to FIGS.
The above-described soundproof structure 1, 1 of the present invention is placed between a pair of steel girders 6, 6 that support a sleeper 7 and constitute a railway bridge. A bearing member 66 having an L-shaped cross section is fixed to the shape steel girders 6 and 6 in the girder direction, and the soundproof structures 1 and 1 are bridged between the bearing members 66.

  When the steel girder 6 is an I-shaped steel girder and vertical stiffeners 63 are installed at regular intervals to reinforce the rigidity of the steel girder, first, the target I-shaped steel girder ( 6 and 6), a mounting bracket 65 having a T-shaped cross section is arranged on a liner-shaped vertical stiffener 63 installed on the flange 62 of the I-shaped steel beam and the web 61 on the opposing surface of the I-shaped steel girder. A support member 66 having an L-shaped longitudinal section is attached and fixed to the metal fitting 65 in the girder direction (lateral direction).

  Thus, the pair of support members 66 facing and fixed are arranged with the horizontal support portions 66a projecting inward and facing each other, so that the necessary number of soundproof structures 1 are juxtaposed and both end portions thereof are supported by the support materials 66. The steel girder bridge soundproofing structure of the present invention is obtained by spanning to the horizontal support portion 66a and fixing with the fixing bolt 17.

  The bearing material is not limited to the L-shaped longitudinal section, and may be any shape having a horizontal bearing portion 66a such as an H shape or a T shape. Further, instead of a pair of opposed support members, a single support member may be spanned between steel girders. The soundproof structure 1 may be attached to the lower surface of the horizontal support portion 66a of the support material 66 and fixed with a fixing bolt.

    Further, in the case of an I-shaped steel girder that does not include the vertical stiffener 63, the support material 66 may be directly attached and fixed to the web 61 of the I-shaped steel girder. Further, even when the steel girder is not an I-shaped steel, the support member 66 having an L-shaped longitudinal section is directly attached to the opposite side surface, or indirectly through a vertical member attached to the side surface at regular intervals. The soundproofing structure 1 can be fixed by attaching to the steel, and the steel girder bridge soundproofing structure of the present invention can be obtained.

  According to the steel girder bridge soundproof structure of the present invention, the advantages of the above soundproof structure of the present invention can be exhibited as a steel girder bridge. In other words, it can absorb the noise of vehicles passing through steel girder bridges and has a drainage groove inside it that can drain the rainwater received on the top surface. Material deterioration, rusting of metal members, and increase in weight of sound absorbing material can also be avoided. In addition, since it has a sound absorbing space inside, it can handle a wide range of noises, and it also provides an effective advantage for soundproofing such as running noise on the road below the steel girder bridge.

The principal part expanded sectional view for demonstrating the soundproof structure of this invention. The principal part top view (A) and side view (B) of embodiment. Sectional drawing (A) (B) (C) which shows the modification of embodiment. The side view (A) and aa top view (B) which show the arrangement | positioning state to the steel girder bridge of the soundproof structure of this invention. The enlarged side view of an attachment part same as the above.

Explanation of symbols

1: soundproof structure 2: sound insulation plate, 21, 22: drainage groove, 21a, 22a: inner wall plate, 21b, 22b: bottom plate, 21c, 22c: outer wall plate, 21d: bent portion, 23: flat plate portion 31: Upper sound absorbing layer, 32: Lower sound absorbing layer 4: Sound absorbing air layer

Claims (8)

      It is a soundproof structure that is formed by laminating sound absorbing layers on the top and bottom of a sound insulation board, and can be arranged between steel girders that constitute a steel girder bridge in parallel, and the sound insulation board has one end to the other end. A soundproof structure characterized in that a drainage groove opened upward is provided.       The soundproof structure according to claim 1, wherein a sound absorbing air layer is provided in parallel with the drainage groove between the sound insulating plate and the lower sound absorbing layer.       When the drainage groove is provided on one side edge portion of the sound insulation plate having a rectangular planar outer shape, a bent portion is provided at the upper end portion of the outer wall plate of the drainage groove, and a plurality of the soundproof structures are arranged in a row. The tip of the other side edge of the sound insulation plate of the adjacent soundproof structure can be covered with the bent portion, or a bent portion is provided at the tip of the other side edge to provide a plurality of the soundproof structures. The soundproof structure according to claim 1, wherein when arranged in a row, the upper end portion of the outer wall plate of the drainage groove of the adjacent soundproof structure can be covered with the bent portion.       When the drainage grooves are provided on both opposing side edge portions of the metal sound insulation plate, and a bent portion is provided at the upper end of the outer wall plate of one of the drainage grooves, and a plurality of the soundproof structures are arranged in a row. The soundproof structure according to claim 1 or 2, wherein the upper end portion of the outer wall plate of the other drainage groove provided in the adjacent soundproof structure can be covered with the bent portion.       Among the sound absorbing layers, at least the upper sound absorbing layer is constituted by a sound absorbing material coated with a water repellent film, and a perforated plate is attached to the upper surface of the upper sound absorbing layer and the lower surface of the lower sound absorbing layer, The soundproof structure according to any one of claims 1 to 4, wherein a soundproof plate unit is formed by integrating a sound insulating plate, a drainage groove, an air layer, and a perforated plate.       A steel girder bridge soundproofing structure characterized in that the soundproofing structure according to any one of claims 1 to 5 is bridged and arranged between opposing steel girders constituting a steel girder bridge.       The steel girder bridge soundproof structure according to claim 6, wherein a support material is fixed to the steel girder, and the soundproof structure is bridged between the support materials. The steel girder is an I-shaped steel girder, a support member having an L-shaped cross section is fixed to the I-shaped steel girder in the direction of the girder, and the soundproof structure is bridged between the support members. The steel girder bridge soundproof structure according to claim 7.

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