JPH0452249Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a supporting device for a bridge or the like, and particularly relates to a device in which the supporting device is coated for rust and dust prevention.

[Conventional technology]

A support device equipped with this type of mechanism is disclosed in, for example, Japanese Patent Laid-Open No. 101906/1983.

In this device, the entire upper shoe and lower shoe constituting the support device are made airtight from the outside by a cover, and the cover is made of a foamed elastic material. The cover is thick and its inner surface is brought into contact with the outer surface of the upper shoe and the lower shoe.

Therefore, compared to a thin cover that only surrounds the moving parts, the weather resistance and strength are improved, and on the other hand, the volume increase can be set by adjusting the mixing ratio of the resin liquid and the foaming agent during construction. Become.

However, the amount of deformation per unit force (larger tensile force) of foam is smaller than that of the same material without foaming, so in the case of the above-mentioned material, the elasticity of the cover due to expansion, contraction and deflection of the bridge girder, etc. The ability to follow deformation is poor, and as a result, small cracks that are invisible to the naked eye or separation from the bridge girder occur in a short period of time, resulting in corrosion of the upper and lower shoes inside the bridge. Corrosion of the upper and lower shoes causes an extremely dangerous situation in the bearing system. And in the above,
Since the condition inside the cover cannot be checked at all from the outside, it is impossible to know the corrosion state of the upper and lower shoes and their fixings, which could lead to the above-mentioned dangerous situation.

In addition, as for this kind of thing, there are other
Described in No. 147312.

This support device is a flexible transparent structure that covers the support from the side of the upper plate of the upper shoe to the side of the bottom plate on which the lower shoe slides, and has a vertical or diagonal joint in at least one place. a sheet, and a band that fastens the sheet around the top plate and the bottom plate, respectively;
The seat is equipped with a fastener that can be opened and closed and is attached to the joint portion of the sheet, and has waterproof and dustproof functions.

However, if this bearing device is used under adverse conditions, there is a possibility that rainwater may enter between the band and the sheet or from the fastener into the space between the bearing and the sheet. If this rainwater enters the space, it will remain and cause corrosion of the upper and lower shoes.

[The problem that the idea aims to solve]

Therefore, in this invention, the elastic deformation of the cover due to the expansion, contraction and deflection of the bridge girder etc. can be easily followed.
To provide a cover mechanism for a supporting device such as a bridge that can completely avoid rainwater from entering between the cover and the upper and lower shoes, and allows the corrosion state of the upper and lower shoes inside the cover to be visually observed from the outside. Take it as a challenge.

[Means to solve problems]

This idea consists of an upper shoe that is fixed to the side of a bridge girder, etc.
It has a lower shoe fixed to the side of the abutment or pier, etc., and an elastic cover provided between the abutment or the pier and the bridge girder, etc. to surround the upper and lower shoes, and the elasticity of the cover is The elastic body constituting the cover is made of a low-modulus device in a device for supporting a bridge, etc., which absorbs the expansion, contraction, and deflection of the bridge girder due to the relative movement of the upper and lower shoes against force. The elastic body is made of a polymeric material, at least a part of which has transparency of more than semi-transparency, and is further provided in such a manner that the inner surface of the elastic body is in contact with the upper and lower shoes in the installed state over almost the entire area. ing.

[Effect]

This idea works as follows.

In the cover device for supporting devices such as bridges of this invention, the elastic body constituting the cover is made of a low modulus polymer material, so the elastic deformation of the cover due to the expansion, contraction and deflection of the bridge girder etc. is very easily followed. The contact between the inner surface of the elastic body and the installed upper and lower shoes is maintained even when the bridge girder or the like expands, contracts, or bends. Therefore, since there is no space between the cover and the upper and lower shoes, rainwater will not enter between the cover and the upper and lower shoes.

Furthermore, since at least a portion of the cover configured as described above is transparent or more translucent, it is possible to know the condition of the upper and lower shoes and their fixing devices located inside the cover from the outside.

〔Example〕

Next, the present invention will be explained in more detail based on the embodiment of the present invention shown in FIG.

Reference numeral 1 denotes a lower shoe, which is fixed by fixing bolts 2 to a shoe seat 3 formed at the top of an abutment or a bridge pier. Lower shoe 1
A convex portion is formed at the center of the upper surface, and a horizontal smooth surface 4 is formed on the upper surface.

Reference numeral 5 denotes an upper shoe fixed to the lower surface of the bridge girder 6 by fixing bolts 7, and the lower central part of the upper shoe 5 includes:
A surface 8 is formed that slidably (or rotatably) abuts against the aforementioned smooth surface 4, and thus a support device 10 is formed by the lower shoe 1 and the upper shoe 5.
The upper shoe 5 and the lower shoe 1 are both made of steel or cast iron.

Reference numeral 11 denotes an elastic polymer-coated sealing material that covers the exposed outer peripheries of the upper shoe 5 and the lower shoe 1 constituting the support device so as to be in contact with each other, and is made of, for example, polybutadiene-based synthetic resin. This material is produced by subjecting liquid monomers to a polymerization reaction at room temperature. This production can be carried out by providing a suitable mold around the support device 10, injecting the monomer into it and subjecting it to a polymerization reaction at room temperature.

In addition, from the viewpoint of followability to the movement of adjacent metal and durability, the lower the modulus of the elastomer, the more preferable it is. At the time of construction, in order to improve adhesion to concrete structures and steel materials, measures such as application of a clean primer may be applied.

In this way, in the present invention, the supporting device 10
Since the entire support device 10 is covered with an elastic sealing material, the possibility of rust occurring in the support device 10 can be completely eliminated. Since the sealing material has elasticity, there is an advantage that the sliding (or rotating) function of the upper shoe 5 is not hindered.

Note that the elastic sealing material is transparent (or semi-transparent).
This allows the condition of the sliding surfaces of the upper shoe 5 and the lower shoe 1 to be inspected from the outside, which is very preferable.However, when a material with excellent weather resistance, water resistance, etc. is desired, it is expected that the material contains oily substances. In that case, it is necessary to use a material that can be obtained, and since it lacks transparency, in that case, if a transparent plastic plate is set in advance in a form that can be easily removed from the mold for pouring, and the material is fixed, the transparent plastic plate can be used. The board can be used as an inspection window.

Between the smooth surface 4 of the lower shoe 1 and the smooth surface 8 of the upper shoe 5,
Due to slippage, both surfaces are susceptible to wear damage. Therefore, it goes without saying that it is desirable to apply a lubricating oil such as grease here.
Therefore, it is extremely preferable to embed in the elastic sealing material 11 a lubricating pipe that can supply lubricating oil onto the smooth surface 4 from the outside, since lubricating can be performed even after coating.

Further, preferable results can also be obtained by using an elastomer material containing an oily substance having lubricating oil.

[Effect of idea]

Since this invention has the above-mentioned configuration, it has the following effects.

From the contents described in the function column, the elastic deformation of the cover that follows the expansion, contraction and deflection of the bridge girder etc. is well followed, and the intrusion of rainwater between the cover and the upper and lower shoes can be completely avoided. We were able to provide a cover device for a support device such as a bridge that allows the corrosion state of the upper and lower shoes inside the cover to be visually observed from the outside.

[Brief explanation of the drawing]

The figure is a side sectional view of an embodiment of a support device for a bridge or the like according to the present invention. 1... Lower shoe, 3... Shoe seat, 4... Smooth surface, 5...
Upper shoe, 6... Bridge girder, 8... Smooth surface, 10... Support device, 11... Elastic sealing material.

Claims (1)

[Scope of claim for utility model registration] An upper shoe fixed to the side of a bridge girder, etc., a lower shoe fixed to the side of an abutment or pier, etc., and a bridge abutment or bridge pier, etc., and a bridge girder, etc. to surround the upper and lower shoes. and a cover of an elastic body provided between the bridge and the bridge, and the relative movement of the upper shoe and the lower shoe against the elastic force of the cover absorbs the expansion, contraction and deflection of the bridge girder, etc. In a device for a support device such as a bridge, the elastic body constituting the cover is made of a low modulus polymeric material, and at least a part of the cover is made to have a transparency of more than translucency, and further, the elastic body A cover mechanism for a support device such as a bridge, characterized in that the inner surface is provided in such a manner that almost all areas of the upper and lower shoes are in contact with the installed upper and lower shoes.