JP5285956B2 - Attenuator mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for connecting a damping device for reducing vertical vibration generated when passing a vehicle, mainly in a reinforced concrete viaduct, to an upper beam.

Conventionally, in a viaduct 2 having a rigid frame structure having cantilevers 1 at both ends, as shown in FIG. 7, vibration is caused by an impact force generated at the end of the viaduct due to a sudden transfer of a vehicle load such as a passing train. Occur. Therefore, as a measure for reducing the vibration, for example, a method is known in which a damping device 21 is supported on a viaduct pier and an upper beam 4 by a reinforcing method in which a damping device 21 is attached in a brace shape via attachments 22 and 23. (See Patent Document 1).
JP 2003-64620 A

  However, in the conventional mounting structure of the damping device 21, as shown in FIG. 8, it is necessary to drill a bolt hole 24 or a bolt through hole in the upper beam 4 made of reinforced concrete. Such a construction method is not adopted because the original strength of the beam is reduced by damaging or cutting the reinforcing bars. Therefore, a construction method that can attach the attenuation device without damaging existing beams is desired. The damping device mounting structure according to the present invention has been proposed in order to solve such a problem.

  The gist for solving the above-mentioned problems of the mounting structure of the damping device according to the present invention is to construct between the bridge pier in the reinforced concrete viaduct having cantilever beams at both ends and the upper beam in the bridge axis direction. The mounting structure with the mounting bracket for fixing the damping device is such that the mounting member on the upper beam side has a U-shaped cross section and a clamping member is configured to sandwich both side surfaces of the upper beam, and the opposing arrangement Adhesive material is used for the clamping surface of the clamping member, and there is a connection support member that connects the clamping members that are arranged opposite to each other, and there is a long bolt for fastening installed on the clamping member, and the connection support member This means that the length can be adjusted in order to set the clamping surfaces of both clamping members in parallel.

  Furthermore, the connection part of the both ends of a connection support member and the connection part of both clamping part members include being pin-coupled.

According to the mounting structure of the damping device according to the present invention, the mounting member is fixed by sandwiching the upper beam or the like, so that vibration can be attenuated without damaging the existing beam. In addition, the length of the connection support member can be adjusted so that the clamping member can be attached in parallel to the side surface of the beam. Thereby, even when the both side surfaces of the beam are not parallel, the clamping member can be installed in parallel, and can correspond to the non-parallel mounting surface.
By connecting the connection support member with the pinching member with a pin structure, bending stress does not act and only the axial force is applied, and there is no risk of deformation when the both pinching members arranged opposite to the side surface of the beam are tightened.

  As shown in FIG. 1, a damping device mounting structure A according to the present invention is constructed between a bridge pier 3 and an upper beam 4 in a bridge axial direction in a reinforced concrete viaduct 2 having cantilever beams 1 at both ends. 5 and the brace material 5a are fixed to the upper beam side mounting bracket 6 and the pier side mounting bracket 3a.

  As shown in FIG. 2, the mounting bracket 6 has clamping members 6 a and 6 b that have a U-shaped cross section so as to sandwich the side surfaces of the upper beam 4 from both sides, and sandwich both side surfaces of the upper beam 4 together. is there. In this clamping member 6b on one side, a flat pressing plate 6c that directly contacts the side surface of the upper beam 4, a pin 7 standing on the pressing plate 6c, and a pin 7 protruding from the pin 7 and sandwiching the clamping surface There are provided a bolt 8 which is a distance adjusting means for adjusting the distance between the fixing member 6 and a fixing nut 6d which is screwed with the bolt 8 and moves the clamping member 6b in the horizontal direction.

  When the bolt 8 is rotated, the pin 7 is pushed, and the clamping member 6b moves in the horizontal direction together with the fixing nut 6d fixed to the outer surface of the clamping member 6b by welding or the like. Thus, the pressing plate 6c is pushed into the side surface of the upper beam 4, so that the clamping member 6a and the pressing plate 6c are strongly sandwiched, and the mounting bracket 6 is fixed to the upper beam 4 by the frictional force thereof. can do.

  Further, an adhesive 9 is used for the clamping surfaces 6e and 6e of the opposingly arranged clamping members 6a and 6b. The adhesive 9 is, for example, an epoxy adhesive. Thereby, the clamping members 6a and 6b are firmly fixed to the side surface of the upper beam 4. In this way, the upper beam 4 is sandwiched from the side surface, so that bolt holes are not drilled in the existing beam, and the beam strength is not lowered.

  In the second embodiment according to the present invention, as shown in FIG. 3A, when both side surfaces of the upper beam 4 are not necessarily parallel, the clamping members 6a and 6b are firmly attached even in such a state. It is a structure that makes it possible. In this mounting structure, there is a connection support member 10 for connecting the sandwiching members 6a and 6b arranged opposite to each other, and a fastening long bolt 11 installed on the sandwiching members 6a and 6b.

  When the side surfaces 4a and 4b are not parallel when the clamping members 6a and 6b are brought into contact with the side surfaces 4a and 4b of the upper beam 4, the clamping surfaces 6e and 6e of the clamping members 6a and 6b are parallel to each other. Further, the length of the connection support member 10 is adjusted. For this adjustment, as shown in FIGS. 3A and 3B, the connection support member 10 includes a main body portion 10a and a short bracket portion 10b, each of which is pinned to the connection end portion 6f on the holding member side. Are combined.

  As shown in FIG. 3C, the connecting portion between the main body portion 10a and the bracket portion 10b has an adjustment gap α and is connected by a bolt 12 and a nut 12a. The length is adjusted in minutes. As described above, the connection support member 10 is adjustable in length in order to set the holding surfaces of both the holding members 6a and 6b in parallel.

  3A and 3B, the connecting portions at both ends of the connecting support member 10 and the connecting required end portions 6f of the holding member members 6a and 6b are pinned by pins 13. Are combined. Thereby, even if a compressive force acts on this connection member 10, a bending moment does not act. Then, the long bolts 11 (four in the figure) are fastened with nuts 11a and fastened from both sides, so that both the clamping members 6a and 6b clamp the upper beam 4 in parallel.

  As a structure that allows the length of the connecting support member 10 in the clamping members 6a and 6b to be adjusted so that the bending moment is not generated, the third to fifth embodiments are shown in FIGS. There is something. That is, as shown in FIG. 4, both end portions of the connection support member 10 are formed in a semicircular arc shape, and the V-shaped receiving material 15 in contact therewith is fixed to the inside of the sandwiching members 6a and 6b. Then, the bolts 14 are passed through as shown in the figure, and used for preventing falling off. The length adjustment of the connection support member 10 is the same as in the second embodiment.

  As a fourth embodiment, as shown in FIG. 5, the connection support members 10c, 10d having male screw portions at both ends are replaced by turnbuckles 16 having female screw portions, so that the overall length of the connection support member 10 is reduced. Can be adjusted.

  Further, as a fifth embodiment, as shown in FIG. 6, a connection support member 10 having a hemispherical receiving seat 17 fixed to the holding members 6a and 6b and having spherical portions accommodated at both ends thereof. , And the cover 18 may be fixed with bolts 19 to form a pin structure. Thereby, the connection support member 10 can freely move in all directions.

  In these embodiments, the fastening force of the bolts 7 and the long bolts 11 that fasten the clamping members 6a and 6b is a fastening force that is greater than the component force in the orthogonal direction among the component forces acting on the mounting surface by the damping device 5. In addition, the fastening force is such that a compressive force acts against the component force in the parallel direction by the fixing force.

It is a whole schematic front view which shows schematic structure of the attachment structure of the damping device which concerns on this invention. It is sectional drawing along the AA in FIG. They are a partially enlarged front view (A), a bottom view (B), and a partially enlarged bottom view (C) of the mounting structure according to the second embodiment. It is a partially expanded front view of the mounting structure according to the third embodiment. It is a partially expanded front view of the mounting structure according to the fourth embodiment. It is a partially enlarged front view of the mounting structure according to the fifth embodiment. It is a schematic whole view of the attachment structure concerning a prior art example. It is an expanded sectional view of the attachment structure concerning the conventional example.

Explanation of symbols

1 cantilever,
2 Viaduct,
3 Pier, 3a Mounting bracket,
4 Upper beam,
4a side surface, 4b side surface,
5 Attenuator,
6 Mounting bracket,
6a clamping member, 6b clamping member,
6c pressing plate, 6d fixing nut,
6e clamping surface, 6f connecting end,
7 pins,
8 volts,
9 Adhesive,
10 connection support member, 10a body part,
10b bracket part, 10c connection support member,
10d connecting support member,
11 long bolt, 11a nut,
12 bolts, 12a nuts,
13 pins,
14 volts,
15 V-shaped receiving material,
16 Turnbuckle,
17 Sacrament,
18 Cover,
19 volts.

Claims (2)

The mounting structure with the mounting bracket to fix the damping device installed between the bridge pier and the upper beam in the bridge axis direction in the reinforced concrete viaduct with cantilever beams at both ends,
The mounting member on the upper beam side is U-shaped in cross section, and a clamping member is configured to clamp both side surfaces of the upper beam, and an adhesive is used for the clamping surface in the opposingly arranged clamping member And
While there is a connection support member that connects the opposingly arranged sandwiching members, there is a long bolt for fastening installed on the sandwiching member,
The connection support member is adjustable in length in order to set the clamping surfaces of both clamping members in parallel.
A structure for mounting an attenuation device characterized by the above. The connecting portions at both ends of the connecting support member and the connecting portions of both sandwiching member members are pin-coupled;
The mounting structure for an attenuation device according to claim 1.

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