JPH1121817A - Bridge support structure - Google Patents

Abstract

(57) [Summary] [Problem] To provide a bridge support structure that prevents a step on a road on a bridge girder from becoming impossible due to a bridge girder coming off from a bearing in a disaster such as an earthquake. I do. SOLUTION: The support structure of the bridge 1 of the present invention includes a pier 2 for supporting a bridge girder 5, a support 3 fixed on the pier 2,
The bridge girder 5 is bridged on the bearing 3, and the step prevention member 4 is provided on the pier 2 outside the bearing 3 along the axial direction of the bridge girder 5. The step preventing member 4 includes a plate-like elastic portion 9 and fixing means 15 for fixing the step-preventing member 4 on the pier 2 and a height adjusting portion including one or a plurality of adjusting plates 7. 8 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure installed on a pier to support a bridge girder in a bridge. The present invention relates to a bridge support structure for preventing a bridge girder from falling on a bridge pier and causing a step on a road on the bridge girder such that vehicles and the like cannot pass.

[0002]

2. Description of the Related Art Conventionally, a bearing 102 as shown in FIGS. 7 to 9 has been used for installing a bridge girder of a bridge on a pier. FIG. 7 is a schematic side view of a conventional bridge 100, in which a support 102 is installed on a pier 101, and a bridge girder 103 is bridged on the support.

Since the bridge girder 103 contains metal such as iron in its constituent members, it has the property of expanding when the temperature rises and conversely contracting when the temperature falls. Therefore, if the bridge girder 103 is directly fixed on the pier 101, there is a possibility that the bridge girder or the pier 101 may be damaged by expansion and contraction of the bridge girder 103. Therefore, bearing 1 between bridge girder 103 and pier 101
By passing through 02, the expansion and contraction of the bridge girder 103 due to the temperature change is absorbed by the elastic deformation of the support 102 so that the bridge girder 103 and the pier 101 are not damaged.

FIG. 8 is a perspective view showing a part of an example of the bearing 102 in a partially broken view.
A rubber support plate 104 is fixed on the base plate 06, and an upper shoe 105 is fixed on the rubber support plate. As the rubber bearing plate 104, a rubber plate and a metal plate alternately stacked are used.

A sole plate 10 is placed on the upper shoe 105.
7, the sole plate is composed of the upper shoe 105 and the bridge girder 10
3 is fixed by a set bolt 108. In addition, as another example of the bearing, there is one in which the sole plate 107 is attached to the bridge girder 103 by welding.

In FIG. 7, when the bridge girder 103 expands and contracts with a change in temperature, a shear force acts on the sole plate 107 of the bearing 102 as shown in FIG. Then, since the lower shoe 106 is fixed on the pier 101,
A shear strain occurs in the rubber support plate 104, and the rubber support plate elastically deforms in the direction of the shear force. This rubber bearing plate 10
The elastic deformation of the bridge 4 absorbs the expansion and contraction of the bridge girder 103, thereby preventing the bridge girder and the pier 101 from being damaged. The rubber bearing plate 104 also plays a role of absorbing vibrations and the like generated when the vehicle passes on the bridge girder 103.

However, even when a conventional bearing is used, in the event of a disaster such as an earthquake, particularly in the case of a strong earthquake such as a strong earthquake with strong shaking or a strong earthquake, as shown in FIG.
The bridge girder 103 may fall on the pier 101 due to being detached from the top or breaking the bearing 102. Then, a large step G is formed on the road on the bridge girder, and there is a concern that traffic by vehicles or the like becomes impossible. It is generally said that when the step G is 5 cm to 10 cm or more, it becomes difficult for the vehicle to pass.

Therefore, it has been proposed to install a step preventing member 4 on the pier 2 as shown in FIGS. As shown in FIG. 6, the step preventing member 4 is a structure that supports the bridge girder 5 at an appropriate height when the bridge girder 5 comes off from above the bearing 3 due to an earthquake or the like. This step preventing material 4
By installing the step prevention member 4 on an existing bridge that is not provided with a bridge, it is possible to prevent a large step G from being generated on a road on the bridge girder 5 at the time of a disaster such as an earthquake. It is easily conceivable to use a pedestal made of a concrete structure or a structure similar to the above-mentioned bearing as a concrete step prevention material.

[0009]

However, in order to install a pedestal made of the concrete structure or a structure similar to the bearing on an existing bridge as a step preventing material, first go to the site and connect the bridge girder 5 in FIG. The necessary height of the step preventing member 4 is determined by measuring the distance between the piers 2, and then the step preventing member 4 having the required height is created at the factory. Therefore,
There was a problem that the creation period was long.

It is also conceivable to prepare a step preventing material in advance every several millimeters pitch and use a material having an appropriate height as appropriate. Will be higher. Further, it is necessary to carry the step preventing members 4 having various heights to the site, which is complicated.
An object of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a bridge support structure that is inexpensive to make and easy to install.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to provide a pier for supporting a bridge girder, a bearing fixed on the pier, the bridge girder bridged on the support, and In a bridge support structure comprising a step preventing member for preventing the step preventing member from falling off on a bearing and falling on the bridge pier, the step preventing member is provided with a plate-shaped elastic portion and fixing means for being fixed on the pier. And a height adjustment unit including one or a plurality of adjustment plates is provided.

According to the bridge support structure having the above-described structure, the height of the step preventing member can be easily adjusted by appropriately selecting the number of adjustment plates. Then, on the spot where the distance between the bridge girder and the pier is measured, it is possible to install the step prevention material on the existing bridge. Also, there is no need to create various types of step prevention materials.

Further, according to the bridge support structure having the above structure, since the step preventing member has the plate-shaped elastic portion, it is possible to absorb the vibration generated in the bridge girder when the vehicle passes by, and to reduce the elasticity. When the bridge girder is elastically deformed when a shear force is applied to it, it can absorb the expansion and contraction of the bridge girder due to temperature changes. Can serve as a bearing.

Further, in the bridge support structure, the height adjusting portion is fixed to the plate-like elastic portion by a high nut and a bolt having an adjustment margin, and the bridge supporting structure is solved. can do. According to the bridge support structure having the above configuration, when adjusting the height of the step preventing member, the high nut has a margin for adjustment, so that the types of bolts to be prepared can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bridge support structure according to the present invention will be described below in detail with reference to FIGS. 1 to 3 and FIG. 1 is a perspective view of a bridge support structure, FIG. 2 is a schematic side view in FIG. 1, FIG. 3 is an enlarged side view of a step preventing material in an embodiment of the present invention, and FIG. 6 is a bridge girder 5 in FIG. 3 is a schematic drawing showing a case where the device is deviated from above.

As shown in FIG. 3, the step preventing member 4 in the embodiment of the present invention comprises a rubber portion having a plate-like shape having a drain groove 12, a fixing means 15 comprising an L-shaped angle 13 and an anchor bolt 14. A height adjusting portion 8 including one or a plurality of adjusting plates 7; and bolts 10 and nuts 11 serving as fastening members.

The step preventing member 4 is installed on the pier 2 according to the following procedure. First, the distance between the bridge girder 5 and the pier 2 in FIG. 2 is measured. And the step preventing member 4
The number of the adjusting plates 7 constituting the height adjusting unit 8 in FIG. 3 is determined so that the height becomes the same as the measured distance.

Next, as shown in FIG. 3, the determined number of the adjusting plates 7 are placed on the plate-like rubber portion 9 having the drain groove 12 and having the lower surface with the nut 11 embedded therein. . Further, the rubber portion 9 having the surface having the drain groove 12 as the upper surface is placed thereon. Then, the rubber portion 9 and the height adjusting portion 8 are fastened by the bolt 10 and the nut 11.

Next, the integrated height adjusting portion 8 and rubber portion 9 are fixed to the support 3 along the axial direction of the bridge pier 2 and the bridge girder 5 as shown in FIG. Stick to the outside. At this time, the drain gutter 12 in FIG.
The integrated height adjusting portion 8 and rubber portion 9 are installed on the pier 2 so as to be parallel to the axial direction of the pier 2. Thus, the assembling of the step preventing member 4 is completed.

According to the bridge support structure of the present embodiment described above, the height of the step preventing member 4 can be easily adjusted by appropriately selecting the number of the adjusting plates 7. If the adjustment plate 7 is brought to the site, it is possible to install the step preventing material on the spot where the distance between the bridge girder 5 and the pier 2 of the existing bridge is measured. Also, there is no need to create various types of step prevention materials.

Further, even if the bridge girder 5 comes off the bearing 3 due to an earthquake or the like, as shown in FIG. 6, since the step prevention member 4 supports the bridge girder 5, there is no large step on the road on the bridge girder 5. . Also, even if the gap between the bridge girders 5 widens,
Since there is no step, by passing an iron plate 6 or the like on the bridge girder 5 as shown in FIG. 6, vehicles and the like can be passed.

The step preventing member 4 is made of a plate-like rubber portion 9.
Therefore, the vibration generated in the bridge girder 5 when the vehicle passes can be absorbed. When a shear force acts on the rubber portion 9, the rubber portion 9 is elastically deformed. Therefore, the expansion and contraction of the bridge girder 5 due to the temperature change can be absorbed.
As shown in (2), when the bridge girder 5 is detached from the bearing 3 and bridges only the step preventing member 4 due to an earthquake or the like, the step preventing member can temporarily serve as the bearing 3.

Further, since the rubber portion 9 has the drainage groove 12, it is possible to drain rainwater that has accumulated between the bearing 3 and the step prevention member 4 on the pier 2 and that has flowed down from between the bridge girders 5, Deterioration due to corrosion or the like of each component can be suppressed.

Next, a step preventing member according to another embodiment of the present invention will be described with reference to FIGS. FIG. 4 is an enlarged side view showing a step preventing member according to another embodiment of the present invention, and FIG. 5 is an enlarged sectional view of a high nut in FIG.

Like the step preventing member 4 according to the first embodiment of the present invention shown in FIG. 3, the step preventing member 4 according to the embodiment shown in FIG. 15 and a height adjusting portion 8 including one or a plurality of adjusting plates 7, but a bolt 10 and a high nut 16 are used as fastening members.

As shown in FIG.
Has a steel part 18 with an inner surface threaded, and has a height adjustment margin 19 (the entire length of the steel part 18). The high nut 16 is simultaneously vulcanized when the rubber portion 9 is molded.

Further, a hole 20 is provided on the bottom surface of the rubber portion 9,
As shown in FIGS. 4 and 5, if the entire length of the high nut 16 is set to be substantially equal to the length from the upper surface of the rubber portion 9 to the upper surface of the hole 20, the elasticity of the step preventing member is further improved. be able to. If no hole is provided and the length of the high nut 16 is set to be substantially equal to the length from the upper surface of the rubber portion 9 to the bottom surface of the rubber portion 9, the height adjustment margin 1
9 can be large.

According to the step preventing member 4 in another embodiment of the present invention described above, when the rubber portion 9 and the height adjusting portion 8 in FIG. As shown in FIG. 5, since the high nut 18 has the adjustment margin 19, the types of the bolts 10 to be prepared can be reduced. Therefore, it is possible to avoid the trouble of transporting various types of bolts to the site.

It is needless to say that the bridge support structure of the present invention is not limited to the above-described embodiment, and various embodiments are possible. For example, the rubber portion 9 may be configured by stacking a metal plate and a rubber plate. For example, resin or iron may be used as the material of the adjustment plate 7.

[0030]

As described above, according to the bridge support structure of the present invention, the step preventing member has the plate-shaped elastic portion and the fixing means for being fixed on the pier, and A height adjusting unit including one or a plurality of adjusting plates is provided. Therefore, the height of the step preventing material can be easily adjusted by appropriately selecting the number of adjustment plates.If multiple adjustment plates are brought to the site, the distance between the bridge girder and the pier can be measured. Therefore, it is possible to install a step prevention material on an existing bridge. Also, there is no need to create various types of step prevention materials.

Further, even if the bridge girder 5 comes off the bearing 3 due to an earthquake or the like, since the step prevention member 4 supports the bridge girder 5, there is no large step on the road on the bridge girder. Further, even if the gap between the bridge girders is widened, there is no step, so that a vehicle such as a vehicle can be passed by bridging an iron plate or the like on the bridge girders.

Further, since the step preventing member has the plate-shaped elastic portion, it is possible to absorb the vibration generated in the bridge girder when the vehicle passes. Further, when a shear force acts on the elastic portion, the elastic portion is elastically deformed. Therefore, since the expansion and contraction of the bridge girder due to the temperature change can also be absorbed, when the bridge girder is detached from the bearing due to an earthquake or the like and spans only the step prevention material, the step prevention material can temporarily serve as the support. .

[0033] A height adjusting portion comprising one or a plurality of adjusting plates is fixed to the plate-like elastic portion by high nuts and bolts. Therefore, when adjusting the height of the step preventing member, the high nut has an adjustment margin, so that the types of bolts to be prepared can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bridge support structure.

FIG. 2 is a schematic side view of FIG.

FIG. 3 is an enlarged side view of a step preventing member according to the embodiment of the present invention.

FIG. 4 is an enlarged side view of a step preventing member according to another embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a high nut portion in FIG.

FIG. 6 is a schematic side view showing a case where the bridge girder in FIG. 2 has moved.

FIG. 7 is a schematic side view of a conventional bridge support structure.

8 is a perspective view in which a part of an example of the bearing in FIG. 7 is partially cut away.

9 is a schematic side view showing a case where the bridge girder in FIG. 7 has moved.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge 2 Bridge pier 3 Bearing 4 Step prevention material 5 Bridge girder 6 Iron plate 7 Adjustment plate 8 Height adjustment part 9 Rubber part (elastic part) 10 Bolt 11 Nut 12 Drainage groove 13 L type angle 14 Anchor bolt 15 Fixing means 16 High nut 17 Washer 18 Steel part 19 Adjustment margin 20 holes

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Hisaga 2-2-2-8 Mishino-cho, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside Nishikawa Rubber Industries Co., Ltd. (72) Inventor Tatsuro Toyoda 2-2-2 Mishino-cho, Nishi-ku, Hiroshima City, Hiroshima No. 8 Inside Nishikawa Rubber Industry Co., Ltd.

Claims (2)

[Claims] A pier (2) for supporting a bridge girder (5), a bearing (3) fixed on the pier, the bridge girder (5) bridged on the bearing, and In a support structure for a bridge (1) comprising a support (3) and a step preventing member (4) for preventing the member from falling off from above and falling onto the bridge pier (2), the step preventing member (4) may have a plate shape. Elastic part (9) and the pier
(2) A bridge having fixing means (15) for being fixed thereon and a height adjusting portion (8) comprising one or more adjusting plates (7). Support structure. 2. The height adjusting portion (8) is fixed to the plate-like elastic portion (9) by a high nut (16) having an adjustment margin and a bolt (10). The bridge support structure according to claim 1.