JPH11117227A - Fitting method of slide-type bridge girder supporting body and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting method of slide-type bridge girder supporting body and the device thereof capable of easily adjusting the supporting body at site to the expansion and contraction of the bridge girder, and also capable of effectively preventing the falling-off of the superstructure of the vertical vibration. SOLUTION: The upper shoe 4 of a rubberlike elastic supporting body 3 fitted with a shear-deformation regulating means is fixed to a superstructure 1a, and also the lower shoe 5 is slidably put on a sliding member 2a placed on a base plate 2 of a recessed shape in section that is fixed on a lower supporting structure 1b. At the time when the superstructure 1a is contracted, the rubberlike elastic supporting body 3 is slid along the sliding member 2a on the base plate 2, and after the superstructure has been contracted, a collar Q for regulating movement is fixedly interposed in the vacant space S between the lower shoe 5 and the base plate 2, and thereafter, the lower shoe 5 and the lower supporting structure 1b are fixed by connecting means 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mounting a slide-type bridge girder support, and more particularly, to the deformation and movement of a rubber-like elastic support due to shrinkage of a concrete bridge girder or a steel bridge girder. A slide type bridge girder support that can easily correct and securely connect the upper and lower structures of the rubber-like elastic support and the lower support and lower supports such as abutments and piers. The present invention relates to a mounting method and a device therefor.

[0002]

2. Description of the Related Art Conventionally, a rubber-like elastic bearing is installed between an upper structure such as a concrete bridge girder or a steel bridge girder and a lower support structure such as an abutment or a pier, and vibration energy from the upper structure is provided. In addition, there is known a bearing method for absorbing and alleviating rolling, rolling, and expansion and contraction of an upper structure.

[0003] A concrete bridge girder shrinks due to shrinkage due to drying and creep until concrete is completely hardened after the concrete is cast, so that the bridge girder shrinks until the bridge girder becomes a complete system. By embedding anchor bars in concrete bridge girders, they are responsible for horizontal and vertical forces. However, there is a problem that the rubber-like elastic bearing body is in a state of shear deformation when the contraction of the concrete is stopped.

Further, in the case of a superstructure such as a concrete bridge girder or a steel bridge girder, the reaction force dispersing bearing and the seismic isolation bearing are provided with a shearing key in order to surely transmit the horizontal force. The bearing is designed to stand upright at the standard temperature (20 ° C). However, the length of the girder changes depending on the seasonal temperature of the installation of the bearing. An anchor bolt is used for this purpose, but a hole for removing the box is provided for the anchor bolt at this time. The play at the time of mounting the shearing key is dealt with by the allowance for removing the box. After the shear key is in place, the anchor bolt is driven. However, the girders expand or contract due to the temperature difference during construction, and the anchor bolt receives horizontal force. If the concrete on which the anchor bolt is cast receives a horizontal force before it hardens, a long hole may be opened in the cast concrete.

Therefore, the rubber-like elastic bearing is preliminarily sheared in the direction opposite to the contraction direction of the concrete, and a pre-shearing bearing (pre-shearing) in which the rubber-like elastic bearing comes to an upright state when the contraction of the concrete stops. Support). In addition, a mechanism that allows the lower or upper shoe of the rubber-like elastic support to slide is provided, and is subjected to shearing deformation until contraction is completed. For example, a post-shear bearing (post-strain adjusting bearing) for erecting a rubber-like elastic bearing body by using the above method is used.

[0006]

However, since the pre-shearing bearing is preliminarily sheared and deformed into a bearing at a factory, the pre-shearing bearing is affected by the timing of the actual installation of the bridge girder, the process delay, the weather, etc., and the bridge girder is designed as designed. There is a problem that shrinkage does not occur. Also, when shearing the bearing body, the device becomes large,
There was a problem that the design of the stopper at the time of shearing became large.

Further, in the case of the above-described bearing device, expansion and contraction of the girder such as drying shrinkage of the girder can be absorbed by sliding, but with respect to vertical vibration, the upper structure and the lower support structure are not provided. Is not fastened, so that there is a problem that the upper structure falls off when subjected to a certain level of vertical vibration. An object of the present invention is to make it possible to easily adjust the bearing at the site with respect to the elongation and contraction of the bridge girder, and to securely fix the upper structure and the lower support structure against vertical vibration. It is an object of the present invention to provide a method of mounting a slide type bridge girder support body and an apparatus therefor, which can effectively prevent the upper structure from falling off.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of mounting a slide type bridge girder support by fixing an upper shoe of a rubber-like elastic support to an upper structure.
The lower shoe is slidably mounted on a base plate fixed on a lower support structure having a concave cross section, and when the upper structure is contracted, the rubber-like elastic bearing body is slid along the base plate, and After contraction, the gist is to fix the space between the lower shoe and the lower support structure with a collar for movement restriction interposed therebetween, and to fix the lower shoe and the lower support structure by fastening means. It is.

In another method of mounting a sliding bridge girder support of the present invention, an upper shoe of a rubber-like elastic support is fixed to an upper structure, and a lower shoe is fixed to a lower support structure having a concave cross section. The lower shoe is slidably mounted on the base plate, and fixed to the gap between the front and rear portions of the lower shoe in the bridge axis direction and the lower support structure with a collar for movement restriction interposed therebetween. The rubber-like elastic bearing body deformed by shearing when the structure contracts is removed by sliding the lower shoe of the rubber-like elastic bearing body along the base plate by removing the collar interposed in the gap. To the upright position, and fix the intermediate space between the lower shoe and the lower support structure generated after the rubber-like elastic support body with a collar for movement restriction interposed between the lower shoe and the lower support structure. With the fastening means It is an Abstract that.

Further, according to the method of mounting a sliding bridge girder support of the present invention, a lower shoe of a rubber-like elastic support is slidably mounted on a base plate fixed on a lower support structure having a concave cross section. The upper structure is placed on the upper shoe of the rubber-like elastic support and positioned and fixed via fastening means, and a gap between the front and rear portions of the lower shoe in the bridge axis direction and the lower support structure. The main point is that the lower shoe and the lower support structure are fixed to each other by fastening means with the movement restricting collars interposed therebetween.

Further, according to the present invention, there is provided an apparatus for mounting a slide type bridge girder support, in which an upper shoe mounted on an upper surface of a rubber elastic support and an upper structure are connected and fixed, and a lower shoe of the rubber elastic support is connected. A movement-controlling collar that is removably interposed in a gap between the front and rear portions in the bridge axis direction and the lower support structure, and a guide is provided along one of the base plate and the lower shoe along the bridge axis direction. A bolt is formed on the other side, and a bolt that fits into the elongated hole for the guide and slides along the elongated hole is erected, and a fastening fitting is provided on the bolt to provide a base plate and a lower shoe. Are configured to be tightened and fixed.

According to the present invention, the upper structure can be easily slid in the direction of the bridge girder (longitudinal direction of the bridge girder), and the upper structure and the lower support structure can be connected to the elongated holes with bolts and fasteners. By securely fastening with metal fittings, it is possible to prevent falling off or the like even in the case of vertical vibration due to an earthquake.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 (a) and 1 (b) show a process diagram of a method of mounting a sliding bridge girder support according to a first embodiment of the present invention, and a mounting device for implementing this mounting method is a concrete bridge girder or the like. Between the upper structure 1a and the sliding member 2a on the base plate 2 having a concave cross section fixed to the lower support structure 1b such as a pier via bolts 6, an upper shoe 4 is provided on the upper surface and a lower surface is provided. A rubber-like elastic bearing body 3 provided with a lower shoe 5 is provided.

As shown in FIG. 1 (a), the method of mounting the sliding bridge girder support is such that the upper shoe 4 of the rubber-like elastic support 3 is fixed to the upper structure 1a and the lower shoe 5 is concave in cross section. Is slidably mounted on the sliding member 2a on the base plate 2 fixed on the lower support structure 1b.
When the upper structure 1a is contracted, the rubber-like elastic bearing 3 is slid along the sliding member 2a on the base plate 2 as shown in FIG. A gap Q between the base plate 2 and the base plate 2 is fixed with a collar Q for movement restriction. Thereafter, the lower shoe 5 and the lower support structure 1b are fixed by a fastening means 20 described later.

The structure of the fastening means 20 is shown in FIGS.
As shown in FIG. 4, a plurality of long holes 8 a and 8 b for guiding are formed along the bridge axis direction in front and back, right and left of the base plate 2, and the long holes 8 a and 8 b for guiding are formed in the lower shoe 5.
A hole 10 is formed which is screwed into the bolt 9a, 9b which fits into the hole 8b and slides along the elongated holes 8a, 8b.

The elongated holes 8a and 8b for the guide are
And a screw hole 10 into which the bolts 9a and 9b are screwed and inserted may be provided in the base plate 2. The hole 10
And a bolt 9 inserted into the guide slots 8a, 8b.
A fastening fitting 11 such as a bracket provided with a screw hole 11a is provided at the tip of each of a and 9b so that the base plate 2 and the lower shoe 5 are fastened and fixed.

A gap S formed between the base plate 2 and the lower shoe 5 when the upper structure 1a slides.
Is inserted with a collar Q for movement restriction. 5 and 6 are cross-sectional views showing the contraction of the upper structure 1a, such as a concrete bridge girder, and the provisional mounting state during expansion. FIG. 5 and FIG. 6 show the results when the upper structure 1a of FIG. The displacement of the bridge girder is absorbed by the fastening portion between the long holes 8a, 8b provided in the base plate 2 and the bolts 9a, 9b provided in the lower shoe 5 via the fastening fitting 11, and the other members are attached to the bridge girder or abutment. Is performed at the standard position XX.

Further, a collar Q for movement restriction is inserted into a gap S formed between the base plate 2 and the lower shoe 5. Next, when the upper structure 1a shown in FIG. 6 is inflated, provisional positioning is performed with the collar Q for stopping the slide, and when the upper structure 1a such as a bridge girder becomes the standard position XX, FIG. As shown, the bolt mounting position is moved to the central portion (standard design position) of the guide slots 8a and 8b, and tightened and fixed.

As described above, by configuring the upper structure 1a so as to be slidable in the direction of the bridge girder, the upper structure 1a slides in response to a roll such as an earthquake or expansion and contraction of the upper structure 1a. The upper structure 1a and the lower support structure 1b are connected to the slots 8a and 8b.
By securely tightening the bolt b with the bolts 9a and 9b and the fastener 11, it is possible to prevent falling off or the like even in the case of vertical vibration caused by seismic motion below a certain level.

FIGS. 8, 9 and 10 show a second embodiment of the fastening means 20 of the mounting device. In this embodiment, the lower shoe 5 is formed with elongated holes 8a and 8b for guiding, and 9a, 9b inserted through the long holes 8a, 8b
And the base plate 2 and the lower shoe 5 are fastened and fixed. 9 and FIG.
The provisional mounting state of the upper structure 1a such as a concrete bridge girder at the time of contraction and expansion shown in FIG. 0 is the same as that of the first embodiment, and therefore the same reference numerals are given and the description is omitted.

Next, a second embodiment of the method of mounting the slide type bridge girder support will be described with reference to FIGS. 11 (a) to 11 (d). First, the upper shoe 4 of the rubber-like elastic support 3 is fixed to the upper structure 1a, and the lower shoe 5 can slide on the base plate 2 fixed on the lower supporting structure 1b having a concave cross section to the sliding member 2a. (FIG. 11A)
reference).

As shown in FIG. 11 (b), a gap S between the front and rear portions of the lower shoe 5 in the bridge axis direction and the base plate 2 fixed on the lower support structure 1b is used to restrict movement. The collars Q are interposed and fixed. And FIG.
As shown in FIG. 1 (c), the deformation of the rubber-like elastic support body 3 that has been sheared when the upper structure 1a contracts is removed by removing the collar Q interposed in the gap S. By sliding the lower shoe 5 along the sliding member 2a on the base plate by the pressing means K such as a jack, the rubber-like elastic support 3 is corrected to the upright state.

Thereafter, as shown in FIG. 11D, a gap S between the lower shoe 5 generated after the rubber-like elastic support 3 is modified and the base plate 2 fixed on the lower support structure 1b. The lower shoe 5 and the base plate 2 fixed on the lower support structure 1b are fixed by fastening means 20 such as bolts and nuts.

FIGS. 12 (a) to 12 (c) show a third embodiment of a method of mounting a post-slide type bridge girder support.
As shown in FIG. 12, first, as shown in FIG. 12 (a), the lower shoe 5 of the rubber-like elastic support 3 is
b on the base plate 2 fixed on
a is slidably mounted on a. Then, FIG.
As shown in (1), the upper structure 1a is placed on the upper shoe 4 of the rubber-like elastic support 3 and positioned, and is fixed via fastening means 20a such as bolts and nuts.

Thereafter, as shown in FIG. 12 (c), the movement is restricted to the gap S between the front and rear portions of the lower shoe 5 in the bridge axis direction and the base plate 2 fixed on the lower support structure 1b. And fix them with the collars Q for each
The base plate 2 fixed on the lower support structure 1b is fixed by fastening means 20b such as bolts and nuts.

By mounting the slide type bridge girder support body in the above-described manner, the upper structure 1a can slide in the bridge girder direction (longitudinal direction of the bridge girder), and rolls due to an earthquake or the like and expands / contracts the upper structure 1a. The upper structure 1a can slide to absorb the movement amount, and the upper structure 1a and the lower support structure 1b can be securely fastened by the elongated holes, the bolts, and the fasteners to prevent the earthquake. Also, falling off can be prevented beforehand due to vertical vibrations.

[0027]

According to the present invention, as described above, it is possible to easily adjust the bearing on site for the elongation or contraction of the bridge girder, and to prevent the upper structure from being violated by vertical vibration. By securely fastening the upper structure and the lower support structure, it is possible to effectively prevent the upper structure from falling off.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are process diagrams of a method of mounting a sliding bridge girder support according to a first embodiment of the present invention.

FIG. 2 is a partial plan view of a mounting device for a sliding bridge girder support of the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a partially exploded perspective view of a mounting device for a sliding bridge girder support.

FIG. 5 is a cross-sectional view showing a provisional attachment state when the upper structure is contracted.

FIG. 6 is a cross-sectional view showing a provisionally attached state when the upper structure is expanded.

FIG. 7 is a partial plan view showing a second embodiment of the mounting device for a sliding bridge girder support.

8 is a sectional view taken along the line BB in FIG. 7;

FIG. 9 is a cross-sectional view showing a provisional mounting state when the upper structure of the second embodiment of the mounting device for a sliding bridge girder support body is contracted.

FIG. 10 is a sectional view showing a provisionally attached state of the upper structure of FIG. 9 when inflated.

FIGS. 11A to 11D are process diagrams of a method of attaching a sliding bridge girder support according to a second embodiment of the present invention.

FIGS. 12 (a) to 12 (c) are process diagrams of a method of attaching a sliding bridge girder support according to a second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1a Upper structure 1b Lower support structure 2 Base plate 3 Rubber-like elastic bearing member 4 Upper shoe 5 Lower shoe 6 Bolt 8a, 8b Slot 9a, 9b Bolt 10 Hole 11 Fastener 11a Screw hole 20 Fastening means Q slide Stopping collar S Gap

Claims (4)

[Claims] An upper structure in which an upper shoe of a rubber-like elastic support is fixed to an upper structure, and a lower shoe is slidably mounted on a base plate fixed to a lower support structure having a concave cross section. When the object contracts, slide the rubber-like elastic support along the base plate, and after the upper structure contracts,
A method of mounting a sliding bridge girder support for fixing a lower shoe and a lower support structure by fastening means while fixing a movement controlling collar in a gap between the lower shoe and the lower support structure. 2. An upper shoe of a rubber-like elastic bearing is fixed to an upper structure, and a lower shoe is slidably mounted on a base plate fixed to a lower support structure having a concave cross section. The deformation of the rubber-like elastic bearing body, which is fixed by interposing the movement-controlling collars in the gaps between the front and rear portions of the shoe in the bridge axis direction and the lower support structure, and which is sheared when the upper structure contracts. By removing the collar interposed in the gap and sliding the lower shoe of the rubber-like elastic support along the base plate, the rubber-like elastic support is corrected to an upright state, and after the rubber-like elastic support is corrected. Attachment method of a sliding bridge girder support for fixing the lower shoe and lower support structure with fastening means by fixing a movement controlling collar in the resulting gap between the lower shoe and the lower support structure with fastening means . 3. A rubber-like elastic support lower shoe is slidably mounted on a base plate fixed on a lower support structure having a concave cross section, and an upper structure is mounted on the rubber-like elastic support upper shoe. The lower shoe is fixed by way of fastening means, and a collar for movement control is interposed in a gap between the front and rear portions of the lower shoe in the bridge axis direction and the lower support structure. A method of mounting a sliding bridge girder support for fixing a lower shoe and a lower support structure by fastening means. 4. A mounting device for a sliding bridge girder support, wherein a rubber-like elastic support is slidably mounted between an upper structure and a base plate fixed on a lower support structure having a concave cross section. The upper shoe attached to the upper surface of the rubber-like elastic support and the upper structure are connected and fixed, and the gap between the front and rear portions of the lower shoe of the rubber-like elastic support in the bridge axis direction and the lower support structure. A collar for movement restriction detachably interposed in the portion is provided, and a long hole for guide is formed along one of the base plate and the lower shoe along the bridge axis direction, and a long hole for guide is provided on the other side. A slidable bridge girder support body comprising a bolt that fits in a hole and slides along the elongated hole, is provided with a fastener, and the base plate and the lower shoe are fastened and fixed. Mounting device.