JP6535954B2 - Bridge girder support structure - Google Patents

Description

  The present invention relates to a bridge girder supporting structure applied to bridges such as railway bridges and road bridges.

A conventional bridge generally incorporates a bridge girder support structure in which a support body for supporting the bridge girder is supported by a bridge pier serving as a base by anchor bolts.
The bridge girder support structure 1 shown in FIG. 4 has an anchor bolt 3 in which a base end 3A is embedded in a bridge 2 and an upper end 3B is provided so as to protrude from the bridge 2.
The anchor bolt 3 is disposed so as to be perpendicular to the bridge 2 and installed vertically through the through hole 5 of the bearing 4 installed on the bridge 2.

The bearing 4 comprises a base plate 6 located in the lower part, a bearing rubber main body 7 disposed on the base plate 6, and a top plate 8 laminated on the bearing rubber main body 7; A bridge girder 10 is fixed on the plate 8.
The bridge girder 10 has an upper flange 11 located at the upper part, a lower flange 12 located at the lower part, and a girder main body 13 connecting the two flanges 11 and 12, and the lower flange 12 is set It is connected and fixed to the upper plate 8 of the bearing 4 via a bolt 14.
The base plate and the anchor bolt have the same structure even in steel bearings such as pin bearings, pivot bearings, bearing plate bearings, etc., in addition to the above-described bearing structure, and are the subject of the present invention.

On the other hand, the through hole 5 through which the upper end portion 3B of the anchor bolt 3 is inserted is formed to penetrate the base plate 6 of the support 4 vertically.
Further, a nut 16 is screwed into the upper end 3B of the anchor bolt 3 penetrating the base plate 6 of the support 4 via a washer 15. By fastening the nut 16, the support 4 is mounted on the bridge leg 2. It is supposed to be fixed.

As a technique relevant to the said bridge girder support structure, the bearing apparatus shown, for example in patent document 1 is known.
The bearing device described in this patent document 1 has a cylindrical coupler main body with an outer diameter substantially the same as the inner diameter of the mounting hole formed in the bearing device mounting plate, and the coupler main body is used for building or bridge The anchor bolt fixed to the lower structure of the structure such as is screwed.

JP, 2010-216086, A

In the structure shown in Patent Document 1 and FIG. 4 described above, the anchor bolt 3 is embedded in the bridge 2 and the upper end of the anchor bolt 3 protruding from the bridge 2 is screwed with the nut 16 (Patent Document 1) In 1), the anchor bolt is screwed to the coupler body.
For this reason, when the base body 4 integral with the bridge girder 10 is lifted by the upper lifting force at the time of the occurrence of an earthquake, the upper lifting force of the base body 4 also acts on the anchor bolt 3, thereby the anchor bolt In some cases, the concrete pier 2 in which 3 is embedded may be destroyed.
And when such damage of concrete generate | occur | produced, there existed a problem that restoration of the bridge pier 2 after an earthquake became difficult. The same problem occurs when the bridge 2 is provided with ribs or studs to generate resistance in the horizontal direction.

  The present invention has been made in view of the above-described circumstances, and even when strong lift is generated in a support unit integrated with a bridge girder at the time of an earthquake, the lift is an anchor bolt. The present invention provides a bridge girder supporting structure capable of preventing the bridge pier from being destroyed by preventing the bridge pier from being transmitted to the bridge pier.

In order to solve the above-mentioned subject, this invention proposes the following means.
According to the present invention, in a bridge in which a bridge girder is supported on a bridge via a support, an anchor member having a base end embedded in the bridge and an upper end provided to project upward from the bridge. A hole provided in the bearing installed on the bridge and through which the upper end portion of the anchor member is inserted, and a hole between the bearing and the anchor member, the anchor being interposed therebetween And a sliding jig for reducing the frictional force along the axial direction of the member.

And, according to the present invention, the upper end portion of the anchor member projecting upward from the bridge pier is not screwed by the nut, but is inserted into the hole of the bearing supporting the bridge girder, and the anchor member within the hole of the bearing The periphery is held by a sliding jig which reduces the frictional force along the axial direction of the.
Thus, in the present invention, even when strong lift is generated in the support unit integrated with the bridge girder at the time of earthquake occurrence, the sliding jig in the hole of the support unit is an axis relative to the anchor member. Relative movement in the vertical direction along the direction, so that the upper lift of the bearing is prevented from being transmitted to the bridge via the anchor member, which may lead to the concrete of the bridge being destroyed Is prevented.
That is, in the present invention, among the forces acting on the anchor member from the support at the time of earthquake, the force along the axial direction of the anchor member is released by the sliding jig, thereby causing significant damage to the bridge pier through the anchor member. Can be prevented in advance.
Further, the sliding jig allows relative movement along the axial direction of the anchor member while suppressing relative movement in the horizontal direction orthogonal to the axial direction of the anchor member, that is, relative movement along the horizontal direction of the anchor member By providing resistance to movement, horizontal displacement of the support by the anchor member can be suppressed.

  Further, in the present invention, between the outer peripheral surface of the upper end portion of the anchor member and the sliding jig, the frictional force between the anchor member and the sliding jig is reduced to permit the relative movement of these. Low friction material is further interposed.

  Further, in the present invention, the low friction material is a solid lubricant in which fine graphite powder is dispersed along the contact surface.

  Further, according to the present invention, a low friction material, for example, a fine friction material, which reduces the frictional force between the anchor member and the sliding jig, between the outer peripheral surface of the upper end portion of the anchor member and the sliding jig. Since the solid lubricant in which the graphite powder is dispersed along the contact surface is further interposed, the low friction material makes the sliding jig in the hole of the support relative to the axial direction of the anchor member. The movement can be smoothed to prevent the lift of the bearing from being transmitted to the bridge pier via the anchor member.

  Further, in the present invention, the upper end portion of the anchor member protruding from the bridge pier has a length exceeding an amount of vertical displacement due to earthquake.

  And according to the present invention, since the upper end portion of the anchor member protruding from the bridge pier has a length exceeding the amount of vertical displacement due to the earthquake, the support does not come upward at the time of the occurrence of the earthquake. Even if the sliding jig in the hole of the body relatively moves along the axial direction of the anchor member, the bearing does not come off the bridge pier, and in this point also minimize the damage caused by the earthquake. Is possible.

  Further, in the present invention, a filling member for clamping the sliding jig from the periphery is provided between the inner surface of the hole of the support and the sliding jig.

  Further, according to the present invention, a filling member is further provided between the inner surface of the hole of the support and the slide jig for clamping the slide jig from the periphery (horizontal direction orthogonal to the axial direction of the anchor member). Therefore, it is possible to further resist the relative movement of the anchor member along the horizontal direction by the sliding jig, and the horizontal displacement of the support body by the anchor member can be effectively suppressed.

  Further, in the present invention, the support includes a base plate located at a lower portion, and a support rubber member installed on the base plate and to which the flange of the bridge girder is fixed via an upper plate on the upper surface thereof. The hole into which the upper end portion of the anchor member is inserted is formed to vertically penetrate the base plate of the support.

  And, according to the present invention, the hole through which the upper end portion of the anchor member is inserted is formed to penetrate the base plate of the support up and down. Therefore, the anchor supported by the bridge pier at the lower position of the support The members can be connected.

  Further, in the present invention, the sliding jig has a small diameter portion whose lower portion is formed in a small diameter, and a large diameter portion whose upper portion is formed in a large diameter, and the small diameter portion and the large diameter portion A step is formed between the steps, and the step of the sliding jig is engaged with an engaged portion formed in the hole of the support.

  And according to the present invention, the step portion located between the small diameter portion and the large diameter portion in the sliding jig is engaged with the engaged portion formed in the hole of the support body. By the engagement, the sliding jig can be stably held in the hole of the support.

In the present invention, even when strong lift is generated in the support unit integrated with the bridge girder when an earthquake occurs, the sliding jig in the hole of the support unit is axially aligned with the anchor member. Relative movement in the vertical direction is easily achieved, as a result of which the upper lift of the bearing is prevented from being transmitted to the bridge pier via the anchor member, and the concrete of the bridge pier is prevented from being broken Be done.
That is, in the present invention, among the forces acting on the anchor member from the support at the time of earthquake, the force along the axial direction of the anchor member is released by the sliding jig, thereby causing significant damage to the bridge pier through the anchor member. Can be prevented in advance.

It is a front sectional view of a bridge girder support structure concerning an embodiment of the present invention. It is a front sectional view which shows the principal part of FIG. It is a front sectional view which shows the modification of embodiment shown by FIG.1 and FIG.2. It is a front sectional view showing the conventional bridge girder support structure.

Embodiments of a bridge girder support structure 100 according to the present invention will be described with reference to FIGS. 1 to 3.
1 and 2, reference numeral 20 denotes a bridge, which has a configuration in which a bridge girder (not shown) is supported on a bridge 21 via a support 22.
An anchor bolt 24 as an anchor member is disposed on the bridge leg 21 so that the proximal end portion 24A is embedded. The anchor bolt 24 is disposed so as to be perpendicular to the bridge 21 and has an upper end 24B provided to project from the bridge 21. The upper end 24B is formed on the bridge 21. It is installed so as to pass through the through holes 25 of the installed support 22 up and down.

The support 22 includes a base plate 26 located at a lower portion, a support rubber main body 27 installed on the base plate 26, and an upper plate (not shown) laminated on the support rubber main body 27. A bridge girder (not shown) is fixed on the upper plate via a set bolt. The through hole 25 into which the upper end portion 24B of the anchor bolt 24 is inserted is formed to penetrate the base plate 26 of the support 22 up and down.
In addition, since the structure of these bridge girder and a set bolt is the same as that of FIG. 4, the duplicate description is abbreviate | omitted.

A sliding jig 30 is disposed between the through hole 25 of the support 22 and the anchor bolt 24 to reduce the frictional force.
The sliding jig 30 is provided in a ring shape so as to surround the upper end portion 24 B at the upper end portion 24 B of the anchor bolt 24 projecting from the bridge leg 21. Reduce the friction along the
Thereby, in the present embodiment, even if strong lift is generated in the support 22 integrated with the bridge girder at the time of an earthquake, the sliding jig 30 in the through hole 25 of the support 22 is: The anchor bolt 24 is moved relative to the anchor bolt 24 in the vertical direction along the axial direction (a), so that the lift of the bearing 22 is prevented from being transmitted to the bridge leg 21 via the anchor bolt 24. .
The slide jig 30 allows relative movement of the anchor bolt 24 along the axial direction (i), while the relative movement of the anchor bolt 24 in the horizontal direction (ii) orthogonal to the axial direction (i) By restraining, ie, resisting relative movement of the anchor bolt 24 in the horizontal direction (b), horizontal displacement of the support 22 by the anchor bolt 24 is suppressed.
The upper end 24B of the anchor bolt 24 which projects from the bridge pier 21 and into which the slide jig 30 is inserted is set to a size (indicated by symbol A), for example, about 10 cm, at which the support 22 does not move upward when an earthquake occurs. It is preferable to do.

Further, as shown in FIG. 2, the sliding jig 30 has a small diameter portion 31 whose lower portion is formed in a small diameter and a large diameter portion 32 whose upper portion is formed in a large diameter, and these small diameters A step 33 is formed between the portion 31 and the large diameter portion 32.
The stepped portion 33 of the sliding jig 30 is engaged with the engaged portion 34 formed in the through hole 25 of the support 22, and the through hole of the support 22 is engaged by the engagement. The sliding jig 30 can be held in a stable state in the space 25.

Further, as shown in FIG. 2, between the outer peripheral surface of the upper end portion 24 B of the anchor bolt 24 and the sliding jig 30, the frictional force between the anchor bolt 24 and the sliding jig 30 is reduced. A low friction material 40 is further interposed to allow these relative movements.
The low friction material 40 uses a solid lubricant or the like in which fine graphite powder is dispersed along the contact surface, and the low friction material 40 causes the sliding jig 30 in the through hole 25 of the support 22 to , To facilitate relative movement of the anchor bolt 24 in the axial direction (i).

In the slide jig 30, the outer surface of the large diameter portion 32 and the inner surface of the through hole 25 of the support 22 may be in direct contact, but as shown in FIG. 3, a filling member 41 may be provided.
The filling member 41 clamps the sliding jig 30 from the periphery and is deformed by the relative displacement between the support 22 and the sliding jig 30, and the horizontal position of the anchor bolt 24 by the sliding jig 30. Provides additional resistance to relative movement along direction (b).

As described above in detail, in the bridge girder support structure 100 shown in the present embodiment, the upper end portion 24B of the anchor bolt 24 protruding upward from the bridge leg 21 is not screwed by the nut and penetrates the bearing 22 supporting the bridge girder. In the hole 25, the periphery is held by a sliding jig 30 that reduces the frictional force along the axial direction (i) of the anchor bolt 24.
Thereby, in the bridge girder support structure 100 of the present embodiment, even if strong lift is generated in the support 22 integrated with the bridge girder at the time of an earthquake, the sliding of the support 22 in the through hole 25 The jig 30 moves relative to the anchor bolt 24 in the vertical direction along the axial direction (i), so that the upper lifting force of the bearing 22 is not transmitted to the bridge leg 21 via the anchor bolt 24. It is prevented that the bridge pier 21 is destroyed.
That is, in the bridge girder supporting structure 100 of the present embodiment, the force along the axial direction (i) of the anchor bolt 24 is released by the sliding jig 30 among the forces acting on the anchor bolt 24 from the support at the time of earthquake. Thus, it is possible to prevent, in advance, the occurrence of large damage to the bridge pier 21 through the anchor bolt 24.
The slide jig 30 allows relative movement of the anchor bolt 24 along the axial direction (i), while the relative movement of the anchor bolt 24 in the horizontal direction (ii) orthogonal to the axial direction (i) By restraining, i.e., resisting relative movement of the anchor bolt 24 in the horizontal direction (b), horizontal displacement of the support 22 by the anchor bolt 24 can be suppressed. In the present embodiment, no bolt is provided to allow upward displacement of the base plate 26 with respect to the anchor bolt 24. However, in the upper part of the anchor bolt 24, it is located at a sufficient distance from the upper surface of the base plate 26. A threaded portion may be provided and a nut (not shown) may be screwed in to stop the upward displacement of the base plate 26 at a predetermined position.

  Further, according to the bridge girder supporting structure 100 shown in the present embodiment, the space between the outer peripheral surface of the upper end portion 24B of the anchor bolt 24 and the sliding jig 30 Since the low friction material 40 for reducing the friction force, for example, a solid lubricant in which fine graphite powder is dispersed along the contact surface is further interposed, the low friction material 40 makes the through hole of the bearing 22 possible. The sliding jig 30 in 25 facilitates the relative movement of the anchor bolt 24 along the axial direction (i), and the upper lifting force of the bearing 22 is transmitted to the bridge leg 21 via the anchor bolt 24. Can be prevented in advance.

  Further, according to the bridge girder supporting structure 100 shown in the present embodiment, the upper end 24B of the anchor bolt 24 protruding from the bridge leg 21 is set to a dimension A which prevents the support 22 from coming upward at the time of an earthquake. Even if the slide jig 30 in the through hole 25 of the support 22 relatively moves along the axial direction (a) of the anchor bolt 24, the support 22 does not come off the bridge leg 21; Also in this respect, it is possible to minimize the damage caused by the earthquake.

  Further, according to the bridge girder supporting structure 100 shown in the present embodiment, the relative displacement between the inner surface of the through hole 25 of the support 22 and the sliding jig 30 causes the sliding jig 30 to be deformed. Is further provided along the horizontal direction (b) of the anchor bolt 24 by the slide jig 30 because the filling member 41 is further provided to fasten from the periphery (the horizontal direction (ii) orthogonal to the axial direction (a) of the anchor bolt 24). Further resistance to relative movement can be provided, and horizontal displacement of the bearing 22 by the anchor bolt 24 can be effectively suppressed.

  Further, according to the bridge girder supporting structure 100 shown in the present embodiment, the through hole 25 through which the upper end portion 24B of the anchor bolt 24 is inserted is formed to penetrate the base plate 26 of the support 22 vertically. At a lower position of the bearing 22, an anchor bolt 24 supported on the bridge pier 21 can be connected.

  Further, according to the bridge girder supporting structure 100 shown in the present embodiment, the stepped portion 33 is formed between the small diameter portion 31 and the large diameter portion 32 in the sliding jig 30 and the steps of the sliding jig 30 Since the portion 33 is engaged with the engaged portion 34 formed in the through hole 25 of the support 22, the sliding jig 30 is inserted in the through hole 25 of the support 22 by the engagement. It can be held stable.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included.

  The present invention relates to a bridge girder supporting structure applied to bridges such as railway bridges and road bridges.

Reference Signs List 20 bridge 21 bridge 22 support body 24 anchor bolt 24A base end 24B upper end 25 through hole 30 slide jig 31 small diameter portion 32 large diameter portion 33 stepped portion 34 engaged portion 40 low friction material 41 filling member 100 bridge girder support Construction

Claims (7)

In a bridge in which a bridge girder is supported via a bearing on a bridge pier,
An anchor member having a proximal end embedded in the pier and an upper end provided to project upward from the pier;
A hole provided in the support installed on the bridge and through which the upper end of the anchor member is inserted;
A bridge girder supporting structure comprising: a sliding jig disposed between a hole of the bearing and the anchor member to reduce a friction force along the axial direction of the anchor member between them. .   Between the outer peripheral surface of the upper end portion of the anchor member and the sliding jig, a low-friction material further reducing the frictional force between the anchor member and the sliding jig to allow relative movement between them is further provided. The bridge girder support structure according to claim 1, wherein the bridge girder is interposed.   The bridge girder supporting structure according to claim 2, wherein the low friction material is a solid lubricant in which fine graphite powder is dispersed along the contact surface.   The bridge girder according to any one of claims 1 to 3, wherein the upper end portion of the anchor member protruding from the bridge pier has a length exceeding an amount of vertical displacement due to earthquake. Support structure.   A filling member is provided between the inner surface of the hole of the support and the sliding jig, which is deformed by the relative displacement of these and clamps the sliding jig from the periphery. Bridge girder support structure according to any one of the above. The bearing has a base plate located at a lower portion, and a bearing rubber member disposed on the base plate and having a flange on the upper surface fixed to the flange via a top plate.
The bridge girder support structure according to any one of claims 1 to 5, wherein the hole through which the upper end portion of the anchor member is inserted is formed to penetrate the base plate of the support vertically. The sliding jig has a small diameter portion whose lower portion is formed in a small diameter and a large diameter portion whose upper portion is formed in a large diameter, and a step portion is formed between the small diameter portion and the large diameter portion Is formed,
The bridge girder support structure according to any one of claims 1 to 6, wherein the step portion of the sliding jig is engaged with an engaged portion formed in the hole of the support body. .

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