JPS5914486Y2 - Fixed shoes with bridge collapse prevention function - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of fixed shoes that restrain the expansion and contraction of superstructures such as bridge girders and only allow displacements such as tilting. This relates to fixed shoes that also have a bridge collapse prevention function.

Conventionally, in these structures, the upper structure is supported by being placed on the lower structure such as a bridge pier, allowing displacement such as tilting, and the load acting on the upper structure, so-called the activity of vehicles passing over the superstructure. Fixed shoes, which distribute and transmit the load to the lower structure, and bridge collapse prevention devices, which engage the upper and lower structures to prevent the upper structure from falling from the lower structure due to excessive force caused by earthquakes, etc., are installed separately. ing.

However, in this method, it is necessary to take up space for installing fixed shoes and bridge collapse prevention devices, and the upper and lower structures must be made large regardless of their strength.In addition, the installation work is complicated, resulting in poor workability and economy. There were still points that needed improvement.

The present invention has been devised in view of these circumstances, and provides a fixed shoe with a simple structure and a bridge collapse prevention function.

In other words, a box-shaped body located between an upper structure such as a bridge girder and a lower structure such as a bridge pier, and fixed to either the ironwork or the substructure, has a rectangular cross-sectional shape and an opening at one end. A rod-shaped body having a rectangular cross-sectional shape and having one end fixed to an upper or lower structure corresponding to the box-shaped body is inserted into the box-shaped body, and the box-shaped body A bearing member made of a rubber elastic body is disposed between the bottom surface of the box-shaped body and the end face of the rod-shaped body, and one side is disposed between the inner surface of the box-shaped body in the bridge axis direction and the rod-shaped body. A guide member having a convex curved surface on one surface and a flat surface on the other surface is disposed with the axis of the convex curved surface oriented in a direction perpendicular to the bridge axis and with the convex curved surface in contact with the side surface of the box-shaped body. Between the inner surface of the box-shaped body in the direction perpendicular to the bridge axis and the rod-shaped body, the guide member is arranged such that the axis of the convex curved part is directed toward the bridge axis or the vertical direction, and the convex curved part is brought into contact with the inner surface of the box-shaped body. These are fixed shoes that are placed in contact with each other and have a bridge collapse prevention function.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a box-shaped body fixed to a superstructure G such as a bridge girder with anchor bolts 2, etc., and the box-shaped body 1 has an opening 3 at one end.
The cross section has a rectangular shape.

Reference numeral 4 denotes a bottom surface corresponding to the opening 3 of the rod-shaped body, 5 and 5 are inner surfaces facing each other in the direction of the bridge axis, and 6 and 6 are inner surfaces facing each other in the direction perpendicular to the bridge axis.

Reference numeral 7 denotes a rod-shaped body having a rectangular cross section, and the rod-shaped body 7 has one end protruding from a lower structure B such as a bridge pier, and is fitted into the box-shaped body 1 through its opening 3, and the other end is inserted into the lower part. It is buried and fixed in structure B.

Reference numeral 8 denotes a bearing pressure member made of a rubber elastic body, and the bearing pressure member 8 is attached to the end surface of the rod-shaped body 7 protruding from the lower structure B so as to come into contact with the bottom surface 4 of the box-shaped body by means such as gluing, screwing, or baking. It is arranged by.

Reference numeral 9.10 denotes a guide member disposed on the side surface of the rod-shaped body 7 protruding from the lower structure B, and the guide members 9 and 10 have convex curved portions 11 and 12 on one surface and flat portions 13 and 14 on the other surface. It is equipped with

The guide member 9 is arranged so that the axis of the convex curved surface portion 11 is directed perpendicular to the bridge axis on the side surface of the rod-shaped body 7 in the bridge axis direction, and the convex curved surface portion 11 is brought into contact with the inner surfaces 5, 5 of the box-shaped body. Then, by means of fitting or the like on the flat part 13, the guide member 10 is attached to the side surface of the rod-shaped body 7 in the direction perpendicular to the bridge axis, and the axis of the convex curved part 12 is directed toward the bridge axis direction, and the convex curved part 12 is bent into a box. The planar portions 14 of the shaped bodies are arranged by means of fitting or the like so as to abut against the inner surfaces 6, 6 of the shaped body.

Here, the box-like body 1 is fixed to the upper structure G by
After placing the upper structure G on the rod-shaped body 7, the upper structure G is manufactured and fixed by burying the anchor bolt 2 placed on the box-shaped body 1, or the upper structure G is fixed in advance at a factory or on-site. It is manufactured by burying only the anchor bolts 2 nearby, and the upper structure G is placed on the box-shaped body 1 arranged together with the rod-shaped body 7 in the lower structure B, and the box-shaped body 1 is arranged in the upper structure G. Alternatively, when the box-like body 1 is manufactured in advance at a factory or near the site, the anchor bolts 2 arranged in the box-like body 1 are buried and integrated with the superstructure G. Various methods may be adopted, such as a method of mounting and fixing the upper structure G so that the box-like body 1 is fitted into the rod-like body 7 of the lower structure B.

By configuring the fixed shoe in this way, vertical and horizontal loads acting on the upper structure G are reliably transmitted to the lower structure B via the bearing member 8 and guide members 9 and 10, and the load of the upper structure G is Displacement such as inclination in the bridge axis or a direction perpendicular to the bridge axis is allowed by deformation of the bearing pressure member 8 and sliding contact of the guide members 9 and 10 disposed in the bridge axis or in a direction perpendicular to the bridge axis.

At this time, the guide member 10.10 arranged on the side surface of the rod-shaped body 7 in the direction perpendicular to the bridge axis is in sliding contact with the inner surface 6.6 of the box-shaped body, and the relative position of the box-shaped body 1 and the rod-shaped body 7 is controlled. It is used to hold and smoothly guide the above-mentioned movements.

In addition, since the box-like body 1 is configured to be placed surrounding one end of the rod-like body 7 that protrudes from the lower structure B such as a pier, excessive displacement of the upper structure G is regulated by its retention. This can prevent accidents such as falling of the superstructure G, so-called bridge collapse.

In addition, when the fixed shoe is used for a structure such as a bridge,
A movable shoe is placed on a specific lower structure B that serves as the origin of expansion and contraction of the upper structure G, and movable shoes are placed on a plurality of other lower structures B that allow displacement such as expansion and contraction and tilting of the upper structure G. .

The fixed shoe constructed as described above is suitable for use in a bridge in which the upper structure G is tilted in a direction perpendicular to the bridge axis and the bridge axis.

In addition, in a bridge in which the upper structure G is tilted only in the bridge axis direction, the guide member 10 is placed between the inner surface of the box-shaped body 1 in the direction perpendicular to the bridge axis and the rod-shaped body 7 on its convex curved surface. A fixed shoe is used in which the axis of the part 12 is directed vertically and the convex curved part is placed in contact with the inner side surface of the box-shaped body.

Furthermore, in order to prevent problems caused by rainwater, dust, etc. entering the box-like body 1, the box-like body 1 is fixed to the upper structure G and the rod-like body 7 is fixed to the lower structure B. However, the box-like body 1 The same effect can be obtained by fixing the rod-shaped body 7 to the lower structure B and the upper structure G.

In addition, in such an embodiment, in order to prevent rainwater and dust from entering the opening 3 of the box-shaped body 1, the opening 3 of the box-shaped body 1 is always covered and the rod-shaped body It is desirable to provide a plate-like or bellows-like lid that can follow the movement of the box-like body 1, or to fill the inside of the box-like body 1 with a rust-preventing viscous material.

Further, the rod-shaped body 7 can be fixed to the upper structure G by placing the rod-shaped body 7 in the box-shaped body 1, and then fabricating and fixing the upper structure G to bury the rod-shaped body 7, or by fixing the rod-shaped body 7 to the upper structure G in advance. When manufacturing G in a factory or near the site, the rod-shaped body 7 is buried and integrated with the upper structure G, and the upper structure G is inserted so that the rod-shaped body 7 is inserted into the box-shaped body 1 of the lower structure B. A method such as a method of mounting and fixing is adopted.

The present invention has the above-mentioned configuration, and has a simple structure that has the function of preventing bridge collapse in addition to the function of a conventional fixed shoe, which reduces the installation space, reduces the size of the upper and lower structures, and improves installation workability. This has great practical effects because maintenance can be simplified and the method of fixing to the upper and lower structures is not limited.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side view showing a fixed shoe having a bridge collapse prevention function according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1: Box-shaped body, 3: Opening, 4: Bottom surface, 5, 6: Inner surface,
7: Rod-shaped body, 8: Bearing pressure member, 9.10: Guide member, 1
1.12: Convex curved surface portion, 13.14: Plane portion.

Claims (1)

[Scope of utility model registration request] A box-shaped body that is located between an upper structure such as a bridge girder and a lower structure such as a bridge pier, and is fixed to either the ironwork or the substructure has a rectangular cross-sectional shape and an opening at one end. A rod-shaped body having a rectangular cross section and having one end fixed to an upper or lower structure corresponding to the box-shaped body is inserted into the box-shaped body, and the bottom surface of the box-shaped body A bearing member made of a rubber elastic body is disposed between the end face of the rod-shaped body, and a convex portion on one surface is disposed between the inner surface of the box-shaped body in the bridge axis direction and the rod-shaped body. A guide member having a curved surface portion and a flat surface portion on the other surface is arranged with the axis of the convex curved surface portion oriented in a direction perpendicular to the bridge axis and with the convex curved surface portion in contact with the side surface of the box-shaped body,
Between the inner surface of the box-shaped body in the direction perpendicular to the bridge axis and the rod-shaped body, the guide member is arranged to direct the axis of the convex curved surface toward the bridge axis or the vertical direction, and to direct the convex curved surface toward the inner surface of the box-shaped body. A fixed shoe having a bridge collapse prevention function characterized by being placed in contact with each other.