JPS6351205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a protective cover for a support used in bridges, elevated structures, etc.

Generally, the bearings used for bridges, elevated structures, etc. are made of a sealing material 1 made of rubber elastic material, as shown in Figure 1.
The upper shoe 2 is fixed to an upper structure G such as a bridge girder, and the lower shoe 3 is fixed to a lower structure B such as a pier.

That is, an annular recess 4 is formed on the upper surface of the lower shoe 3, and the sealing material 1 is fitted into the annular recess 4, thereby sealingly surrounding the movable part 5 disposed between the upper and lower shoes 2 and 3.

However, in this method, the end of the sealing material 1 is brought into contact with the lower surface of the upper shoe 2, so when the upper shoe 2 moves together with the upper structure G as the upper structure G expands, contracts, and bends. Then, the lower surface thereof comes into sliding contact with the sealing material 1.

Therefore, if the frictional force between the sealing material 1 and the upper shoe 2 is large, the sealing material 1 will slip out of the annular recess 4 of the lower shoe due to the movement of the upper shoe 2, and in this state, the upper shoe 2 will be removed. When it moves, the sealing material 1 undergoes deformation such as twisting, which causes the problem that the sealing material 1 is damaged and its function as a sealing material 1 is impaired.

The present invention has been made to solve these problems.

That is, an inner formwork is arranged surrounding the support placed between the upper and lower structures, an outer formwork is then provided around the inner formwork at a predetermined interval, and a foaming agent is mixed between the inner and outer forms. To provide a method for forming a protective cover for a bearing, characterized by injecting a predetermined amount of a resin raw material solution and foaming it between an inner and outer mold frame to form an elastic foam that adheres to an upper and lower structure. It is.

In the present invention, the term "support" refers to something that supports the upper structure and has the function of relieving the expansion, contraction, and deflection of the upper structure using a movable part disposed between the upper and lower shoes.

The movable part may be a generally used bearing plate, a rubber elastic body, a combination of a rubber elastic body and a sliding material, a rolling element such as a roller or rocker, or a combination of these, or even just the upper and lower shoes of the support. It includes the pivots that provide these functions.

In addition, the inner formwork that surrounds the bearing is used for the purpose of preventing the resin raw material liquid or foam from entering the bearing part when the resin raw material liquid is foamed to form a foam. It is something.

In addition, the inner formwork has the rigidity as a formwork, and since the inner formwork itself remains between the upper and lower structures together with a protective cover, so-called foam, the material for the inner formwork is not limited to the expansion and contraction and deflection of the upper structure after forming the foam. Although it may be a material that breaks due to the movement of the upper structure, it is preferable to use a thin rubber plate, cloth or paper reinforced with synthetic resin, which has elasticity that can follow the movement of the upper structure, and which easily adheres to the foam. It is something.

Furthermore, the outer formwork refers to a formwork in which the resin material liquid is foamed to form a foamed body so as to surround the support in a predetermined shape.

Therefore, when the outer form is to be used repeatedly, it is necessary to use a metal plate such as a stainless steel plate or silicone rubber that has excellent releasability from the foam to facilitate its removal after forming the foam. Considering workability, it is preferable to construct the plate by dividing it into several parts using a material such as a common steel plate or the like with a fluorine resin coating film or a silicone resin coating film, and providing at least one injection hole. In addition, when the foam is left between the upper and lower structures, it is preferable to use the same material as the inner formwork, which has elasticity that can follow the movement of the upper and lower structures.

In addition, when installing the inner and outer formworks, in order to prevent the raw material liquid or foam from leaking from the inner and outer formworks when the resin raw material liquid foams to form a foam, the ends of the inner and outer formworks should be It is necessary to bring the parts into close contact with the upper and lower structures, and the method of contact is to bond the contact parts of the inner formwork with adhesive, or to attach the contact parts of the outer formwork with adhesive or adhesive tape. A form of sealing is adopted.

Furthermore, the resin raw material liquid refers to a material that is foamed by mixing a foaming agent into the resin liquid to form a foam, and materials that generally exhibit such characteristics include urethane resin, polyethylene resin, and chlorinated resin. Examples include vinyl resin, urea resin, etc., but in particular in the present invention, after forming the foam, the foam has elasticity that can follow the movement of the upper structure,
In addition to being excellent in weather resistance, it is easy to handle and install on site, and has excellent adhesion.Furthermore, the volume increase can be set by adjusting the mixing ratio of resin liquid and foaming agent, and the foam formation time is short. A urethane resin foam with a short length is suitable.

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

Reference numeral 10 denotes an upper shoe constituting the support S, and the upper shoe 10 is fixed to a superstructure G such as a bridge girder with an anchor bolt 11.

Reference numeral 12 denotes a lower shoe constituting the support S, and the lower shoe 12 is fixed to a lower structure B such as a bridge pier with an anchor bolt 13.

Reference numeral 14 denotes a movable part disposed between the upper and lower shoes 10 and 12 constituting the support S. In this embodiment, the movable part 14 has one surface formed into a convex curved surface 15 and the other surface formed into a flat surface 1.
6 is shown in an embodiment using a bearing plate formed as shown in FIG.

The movable part 14 has a convex curved surface 15 in sliding contact with a concave curved surface 17 formed on the upper surface of the lower shoe 12, and a flat surface 16 in sliding contact with the lower surface of the upper shoe 10. By sliding with the lower surface of the shoe 10, the deflection is released by sliding between the convex curved surface 15 and the concave curved surface 17 of the lower shoe.

18 is an inner formwork arranged so as to surround the bearing S;
Reference numeral 9 denotes an outer frame having at least one injection hole 20 arranged so as to surround the inner frame 18.

The ends of the inner and outer forms 18 and 19 are in contact with the upper and lower structures G and B, and the inner and outer forms 18 and 19 are arranged with a predetermined interval so as to seal the support S. It is something that

21 is an inner and outer formwork 1 so as to surround and seal the bearing S.
The protective cover 21, which is in close contact with the upper and lower structures G and B formed by the upper and lower structures 8 and 19, is made of an elastic foam.

Here, the method for forming the protective cover 21 will be described in detail.

That is, the protective cover 21 covers the upper and lower structures G and B.
An inner formwork 18 is placed around the support S placed between them, with its ends glued to the upper and lower structures G and B, so as to surround the support S, and then the outer formwork 19 is attached to the inner formwork. 18 surrounding the inner formwork 18, and the inner formwork 1
The ends thereof are placed in close contact with the upper and lower structures G and B so as to form a predetermined distance from the upper and lower structures G and B.

Next, a predetermined amount of the resin raw material liquid mixed with a foaming agent between the inner and outer molds 18 and 19, which is determined based on the volume defined by the inner and outer molds 18 and 19 and the volume increase rate of the foam, is poured into the outer mold. The foam is injected through the injection hole 20 of the frame, and is foamed, so-called mold foaming, so as to surround the support S between the inner and outer forms 18 and 19 and to tightly contact the upper and lower structures G and B. It is composed of

Further, when the outer form frame 19 has elasticity, it is left alone together with the foam, and in the case of repeated use, it is removed after the foam has hardened.

In the present invention, an annular thin rubber plate is used as the inner form 18, the outer form 19 is made of a stainless steel plate, and urethane resin (manufactured by Nisshinbo Co., Ltd., trade name: Kyu-Bron) is used as the resin raw material liquid. The volume between the inner and outer forms (inner form diameter: 50 cm, outer form diameter: 82 cm, height: 15 cm)
50, raw material liquid 6 was stirred and injected for about 30 seconds, and foaming was completed in about 5 minutes. After this was left to cure for about 24 hours, the outer formwork 19 was removed and a protective cover 21 made of elastic foam and having a wall thickness of 16 cm was formed to cover the support S.

In this way, the protective cover 21 that seals the bearing S
By forming this, sealing performance can be significantly improved compared to conventional sealing methods, and maintenance management can be made easier.

Further, since the protective cover 21 can follow the expansion/contraction and deflection of the upper structure G through its elastic deformation, the movement can be smoothly released by sliding the movable part 14 and the upper and lower shoes 10, 12. It is something.

In this embodiment, the protective cover 21 is applied to the bearing S, but the protective cover 21 can also be applied to a shock absorbing device attached to the bearing S, a so-called shock absorbing device that absorbs sudden loads such as those caused by an earthquake. It is something.

The present invention has the above-mentioned structure, and by surrounding and sealing the bearing disposed between the upper and lower structures with a protective cover made of foam, it is possible to prevent the deterioration of sealing performance due to slippage and damage of the sealing material, which is observed in conventional bearings. This has many benefits, such as ease of maintenance and management, and excellent workability since the protective cover can be easily formed on site.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view showing a conventional method for forming a sealing material on a bearing, and FIG. 2 is a partially longitudinal side view showing a method for forming a protective cover of the present invention on a bearing. S: Support, G: Upper structure, B: Lower structure, 1
0: Upper shoe, 12: Lower shoe, 14: Movable part, 21: Protective cover.

Claims (1)

[Claims] 1. Formation of a protective cover that protects the movable parts of a support, which consists of an upper shoe fixed to an upper structure such as a bridge girder, a lower shoe fixed to a lower structure such as a bridge pier, and a movable part arranged between the upper and lower shoes. In the method, an inner formwork is provided surrounding a support placed between the upper and lower structures, and an outer formwork is provided around the inner formwork at a predetermined interval, and a resin mixed with a foaming agent is provided between the inner and outer formworks. A method for forming a protective cover for a bearing, comprising injecting a predetermined amount of a raw material liquid and foaming it between an inner and outer mold frame to form an elastic foam that adheres to an upper and lower structure.