JP4343797B2 - Bearing mounting method - Google Patents

Description

The present invention relates to a bearing mounting method .

  On support members (under construction) such as piers and abutments, it is widely practiced to support bridge girders via supports. Generally, a support is fixed to a support member or a bridge girder by an anchor (see, for example, Patent Document 1).

  By the way, a support may be newly installed in addition to the existing support for reasons such as seismic reinforcement. However, when a support is additionally installed, an anchor for fixing the support may interfere with, for example, a bar arrangement already provided in the bridge girder, and the support may not be attached at a desired position.

In addition, in a new bridge, it may be preferable to slightly adjust (move) the position of the anchor even when the support is attached to the support member.
Japanese Patent Laid-Open No. 11-13020

SUMMARY OF THE INVENTION In view of the above, it is an object to obtain a bearing mounting method for mounting the bearing on the bridge girder or support member as adjustable position of the anchor.

The invention according to claim 1 is a support mounting method for attaching a support installed on a support member and supporting a bridge girder to the support member or the bridge girder, and the support is the support member or the bridge girder. A mounting plate disposed in contact with the base plate, an eccentric hole piece formed at a position where a through-hole through which an anchor for mounting a support to the support member or the bridge girder passes is eccentric from the center, and formed in the mounting plate, A housing hole that rotatably accommodates the eccentric hole piece, and the eccentric hole piece is rotated in the housing hole so that the anchor does not interfere with a reinforcing bar in the support member or the bridge girder. Then, after adjusting the position of the through hole, the anchor is passed through the through hole and the support is joined to the support member or the bridge girder .

In this support mounting method , as a support, an eccentric hole formed at a position eccentric from a center through which a mounting plate arranged in contact with the support member or the bridge girder and an anchor for attaching the support to the support member or the bridge girder is passed. A piece provided with a piece and an accommodation hole that is formed in the mounting plate and rotatably accommodates the eccentric hole piece is used. The mounting plate is placed in contact with the support member or bridge girder. An accommodation hole is formed in the mounting plate, and the eccentric hole piece is rotatably accommodated. In the eccentric hole piece, the through hole through which the anchor passes is formed at a position eccentric from the center, and the position of the through hole can be adjusted by rotating the eccentric hole piece. For this reason, the position of the anchor penetrated through the through hole can also be adjusted.

Then, when mounting by bonding a bearing on the support member or bridge girder (for example, when installing a bearing for the new bridge, in addition to bearing already provided, if you add a new supported), the present invention In the bearing mounting method, after adjusting the position of the through hole by rotating the eccentric hole piece in the receiving hole so that the anchor does not interfere with the reinforcing bar in the support member or bridge girder, the anchor is changed to the through hole. The support is joined to the support member or the bridge girder by penetrating.

  Since the present invention is configured as described above, the position of the anchor can be adjusted.

  FIG. 1 shows a state in which a support 18 is attached between a substructure 14 such as an abutment or an abutment and a bridge girder 16 by the support mounting structure 10 of the first embodiment of the present invention. The bearing 18 may be a so-called fixed bearing or a movable bearing.

  In the following, a case where a support 18 is further added to the existing support 12 will be described first as shown in FIG.

  The support 18 includes a support main body 20 at an intermediate portion in the vertical direction, an upper rod 22 fixed to the upper portion, and a lower rod 24 fixed to the lower portion. In the case of a fixed bearing, the bearing body 20 integrally connects an upper collar 22 and a lower collar 24 so that they are not inadvertently displaced in the horizontal direction. On the other hand, in the case of a movable bearing, it is configured to include at least an elastically deformable material such as rubber, and the upper collar 22 and the lower collar 24 can be relatively moved by deformation of the bearing body 20. .

  Each of the upper rod 22 and the lower rod 24 has a flange portion 26 that projects to the side of the support body 20. As shown in detail in FIGS. 2 and 3, the flange portion 26 is formed with one or a plurality of accommodation holes 28 in which either one of the eccentric hole piece 30 and the center hole piece 32 is rotatably accommodated. . FIG. 2 shows an example in which eight accommodation holes 28 are formed in the upper collar 22.

  As shown in FIG. 4B, the center hole piece 32 is formed in a cylindrical shape having an inner diameter that can be accommodated in the accommodation hole 28 and the same height as the upper collar 22 and the lower collar 24. An anchor through hole 34 through which the anchor passes is formed at the center.

  On the other hand, as shown in FIG. 4A, the eccentric hole piece 30 is formed in a columnar shape having the same diameter and height as the center hole piece, but the anchor through hole 34 is displaced from the center. The center hole piece 32 is different from the center hole piece 32 in that it is formed at a position, that is, an eccentric position.

  Accordingly, the position of the anchor through hole 34 does not move even if the center hole piece 32 is rotated in the accommodation hole 28. However, when the eccentric hole piece 30 is rotated, the position of the anchor through hole 34 is set to a predetermined circumference. Move along.

  In this embodiment, as can be seen from FIG. 2, the center hole piece 32 is accommodated only in one accommodation hole 28 out of the eight accommodation holes 28, and the eccentric hole piece 30 is accommodated in the other accommodation hole 28. is doing.

  In order to further install the support 18 by the support mounting structure 10 of this embodiment having such a configuration, the support 18 is fixed on the substructure 14 and the bridge girder 16 is fixed (joined) on the support 18. To do. The support 18 and the bridge girder 16 are fixed by passing the anchor 36 through the anchor through hole 34 and attaching the washer 38 to the anchor 36, and then fastening a fastening member such as a nut 40.

  Here, in general, internal members such as reinforcing bars 42 are often provided inside the bridge girder 16. Therefore, for example, if the through hole is directly formed in the upper collar 22 as in the prior art, the position of the anchor cannot be adjusted. Therefore, as shown by the two-dot chain line in FIG. The muscle 42 may interfere with it. In order to avoid this interference, for example, if the anchors 36 are installed simply by expanding the through holes of the upper collar 22, it is impossible to apply a shearing force to all the anchors 36 evenly.

  On the other hand, in the support mounting method of this embodiment, since the accommodation hole 28 is formed in the upper collar 22 and the eccentric hole piece 30 is accommodated in a part of the accommodation hole 28, the eccentric hole piece 30 is accommodated in the accommodation hole. By rotating within 28, the position of the anchor through hole 34 can be moved. Therefore, if the position of the anchor through hole 34 is appropriately adjusted so that the anchor 36 does not interfere with the reinforcing bar 42 and the like, the support 18 and the bridge girder 16 can be joined while avoiding these interferences. Since all the anchors 36 can be arranged in the vertical direction, a shearing force can be applied evenly.

  As described above, in this embodiment, the position of the anchor through hole 34 can be adjusted by rotating the eccentric hole piece 30 in the accommodation hole 28 formed in the upper collar 22 (or the lower collar 24). The position of the anchor 36 can be adjusted to a desired position. Therefore, in the above, the case where the support 18 and the bridge girder 16 are joined is taken up, and the example in which the eccentric hole piece 30 is rotated in the accommodation hole 28 of the upper rod 22 is given. In this case, the same bearing mounting method can be applied.

  That is, in the substructure 14, it may be preferable to change the position of the anchor and attach the support 18 to the substructure 14, for example, for convenience of design. In such a case, the position of the anchor 36 may be adjusted by rotating the eccentric hole piece 30 in the accommodation hole 28 of the lower rod 24 to move the position of the anchor through hole 34.

In the above, in the upper collar 22 or the lower collar 24, the example in which the eccentric hole piece 30 and the center hole piece 32 are respectively accommodated in the plurality of accommodation holes 28 is described, but the eccentric hole pieces are accommodated in all the accommodation holes 28. Alternatively, the eccentric hole piece 30 may be accommodated only in one accommodation hole 28, and the center hole piece 32 may be accommodated in all other accommodation holes 28. In short, if the eccentric hole piece 30 is accommodated in at least one accommodation hole 28, the position of the anchor 36 that penetrates the anchor through hole 34 of the eccentric hole piece 30 can be adjusted.

  In addition, the eccentric hole piece 30 has a cylindrical shape and the accommodation hole 28 has a shape corresponding to this, but the shape is not limited thereto. For example, the eccentric hole piece may be formed in a prismatic shape having a regular polygonal bottom surface, and the accommodation hole 28 may be a regular polygonal cylinder that can accommodate the eccentric hole piece correspondingly. In this shape, when the bottom surface is a regular n-gon, the eccentric hole piece can be rotated at an angle of (360 degrees / n). In contrast, a cylindrical shape as shown in FIGS. 4A and 4B is preferable because the eccentric hole piece can be rotated with a simple shape and the rotation angle is not limited.

  Moreover, when the position of the accommodation hole 28 for accommodating the center hole piece 32 is determined in advance, the center hole piece 32 may have a shape different from that of the eccentric hole piece 30. However, considering the case where the position of the accommodation hole 28 for accommodating the center hole piece 32 is not determined in advance, the outer shape of the center hole piece 32 and the eccentric hole piece 30 is the same (inevitably as the accommodation hole 28 as well). All of them have the same shape), and the center hole piece 32 and the eccentric hole piece 30 can be determined at the construction site without distinguishing between the center hole piece 32 and the eccentric hole piece 30, and the construction is preferable.

  In the present invention, examples of the anchor for joining the support 12 to the bridge girder 16 and the substructure 14 include an anchor bolt and an anchor bar. In general, an anchor bar is used to join the support 12 to the bridge girder 16 and an anchor bolt is often used to join the substructure 14, but is not limited thereto.

It is a partially broken front view which shows the support attached to the bridge girder by the support mounting structure of 1st Embodiment of this invention. It is explanatory drawing shown in the state which looked at the upper collar to which the support mounting structure of 1st Embodiment of this invention was applied from the downward direction. It is an expanded sectional view which shows the support mounting structure of 1st Embodiment of this invention, (A) is the vicinity of eccentric hole piece, (B) is the vicinity of center hole piece. (A) is an eccentric hole piece, (B) is a perspective view which shows a center hole piece, respectively.

Explanation of symbols

10 Bearing mounting structure 12 Bearing 14 Substructure (supporting member)
16 Bridge girder 18 Bearing 20 Bearing body 22 Upper arm (Mounting plate)
24 Lower arm (Mounting plate)
26 Flange portion 28 Housing hole 30 Eccentric hole piece 32 Center hole piece 34 Anchor through hole 36 Anchor 38 Washer 40 Nut 42 Reinforcement

Claims (1)

A support installation method for attaching a support installed on a support member and supporting a bridge girder to a support member or a bridge girder,
The bearing is
A mounting plate arranged in contact with the support member or the bridge girder;
An eccentric hole piece formed at a position where a through hole through which an anchor for attaching a support to the support member or the bridge girder is eccentric from the center;
An accommodation hole that is formed in the mounting plate and rotatably accommodates the eccentric hole piece;
With
After adjusting the position of the through hole by rotating the eccentric hole piece in the receiving hole so that the anchor does not interfere with the reinforcing bar in the support member or the bridge girder, the anchor is changed to the through hole. A support mounting method, wherein the support is joined to a support member or a bridge girder through the support.

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