JPH0841827A - Support device for structure - Google Patents

Abstract

PURPOSE:To reduce the friction of the slide face of a sliding support used for a bridge or a building and stably keep the tow frictional condition for a long period and realize a maintenance free lubrication with a relatively low cost device. CONSTITUTION:A lubricant 9 is charged full in a lubricant case 8 or a lubricant bag 11 having a shape surrounding a sliding support 1 arranged between a structure A to be supported and a supporting base body B. Or a containing space of lubricant formed as an upper shoe case or true like of the sliding support 1 is filled with a lubicant 9 to make a structure in which the slide face 4 of sliding support 1 is immersed in the lubricant 9. The slide face 4 is always immersed in the lubricant and the lubricant 9 is automatically supplied to the slide face 4 when the sliding members 2, 3 are displaced relatively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure supporting device used for supporting a bridge girder or supporting a building, a floor, a heavy machine or the like.

[0002]

2. Description of the Related Art In bridges, in order to reduce deformation of bridge piers caused by thermal expansion and contraction of bridge girders and to reduce seismic response, there is a construction method in which laminated rubber bearings or sliding bearings are sandwiched between the bridge girders and piers. Has been adopted. In buildings, floors, heavy machinery, etc., the seismic isolation construction method is used in which supported objects are supported by laminated rubber bearings or sliding bearings for the purpose of reducing seismic response.

Among such supporting devices, the sliding bearing has a function of supporting the weight of the supported body, and also has a function of preventing seismic force from being transmitted to the supported body by sliding, and absorbs expansion and contraction deformation due to temperature. There is a function that does not generate temperature stress. Therefore, in the sliding bearing, the frictional characteristics of the sliding surface of the sliding member attached to the supporting base and the supported body are important, and this frictional characteristic is greatly influenced by the material forming the sliding surface, the roughness of the sliding surface, and the like. However, the factor that has a particularly large influence is the presence or absence of lubricating oil on the sliding surface.

Regarding the lubrication on the sliding surface, conventionally, (1) a method of using a material having a small friction coefficient for the sliding member and using it without lubrication (2) a method of previously applying lubricating oil to the sliding surface (3) An automatic lubrication system is installed and a method of circulating lubricating oil on the sliding surface is adopted.

[0005]

However, each of the conventional sliding bearings described above has the following problems.

(1) When the sliding bearing is used without lubrication, generally low friction such as rolling friction cannot be expected, and the original function of impeding force transmission is impaired. Further, there is a drawback that it is difficult to design the structure because the friction coefficient largely varies depending on the surface pressure, the speed and the history of repetition.

(2) When lubricating oil is applied to the sliding surface, stable low friction is obtained in the initial stage, but the frictional force gradually increases as the number of repeated displacements increases, and at the same time, the stability increases. It has the drawback of being lost.

(3) When automatically lubricating the sliding surface with oil, an extremely low coefficient of friction is stably maintained, but additional equipment for constantly circulating oil is required, and in the event of an earthquake. In order to function reliably against such rare events, it is necessary to keep the system in operation and stand by at all times, and it is necessary to maintain and manage the system in detail, resulting in high initial costs and running costs.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to make a sliding surface of a sliding bearing have a low friction with a relatively simple and low-cost device. An object of the present invention is to provide a structure support device capable of maintaining this low friction stably for a long period of time and allowing maintenance-free lubrication.

[0010]

SUMMARY OF THE INVENTION In a structure supporting device according to the present invention, a case or bag having a shape surrounding a sliding bearing arranged between a supporting base and a supported body is filled with a lubricant or slips. The sliding surface of the sliding bearing is soaked in the lubricant by filling the lubricant containing space formed in the upper member or the lower member of the bearing with the lubricant.

The lubricant is a liquid lubricant such as machine oil,
Use a semi-solid lubricant such as grease or water.

[0012]

In the above structure, the sliding surface of the sliding member is always immersed in the lubricant, and when the sliding member is relatively displaced according to the movement of the supporting base or the supported body, the lubricating agent is automatically applied to the sliding surface. It is supplied and low friction is maintained stably for a long period of time.

FIGS. 3 and 4 show the conventional oil-free case, the conventional sliding surface simply coated with oil, the sliding surface of the present invention dipped in oil, and the sliding surface of the present invention dipped in water. It is a graph which showed the experimental result of the change of the friction coefficient in the case of doing. In the case of unlubricated oil shown in Fig. 3, although the friction coefficient gradually decreases with the repeated displacement history, the friction coefficient is high and the transmission of force due to seismic force or elastic deformation cannot be obstructed, and stable friction is maintained. Unable to get the coefficient. When oil is simply applied to the sliding surface in FIG. 3, the friction is low and stable at the initial stage, but when repeatedly displaced, the friction coefficient gradually increases and the stability is lost.

On the other hand, when the sliding surface of FIG. 4 in the present invention is immersed in oil, a low coefficient of friction is obtained although the coefficient of friction is slightly higher than in the case of 1, and even when subjected to repeated displacement, The low friction and stable characteristics are always maintained. Further, when the sliding surface of FIG. 4 in the present invention is immersed in water, the friction coefficient is slightly higher than that of the oil, but this is not a size that poses a practical problem, and is similar to that of the oil. Low friction is maintained stably.

That is, in and of the present invention, the friction can be made lower than that, and the low friction can be stably maintained for a long period of time as compared with, and the relatively simple and low cost device The sliding bearing function can be fully exerted and maintenance-free lubrication is possible. Further, since the difference from that of the present invention is extremely small, it can be seen that even if the characteristics such as the viscosity of the lubricant change considerably with age, the friction characteristics are hardly affected. Therefore, this also enables maintenance-free operation and, together with the automatic supply of the lubricant to the sliding surface, it can be maintenance-free for a long period of time.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. 1 and 2 are various embodiments of the sliding bearing according to the present invention. The sliding bearing 1 is installed between a supported structure A such as a bridge girder or a building and a supporting base B such as a bridge pier or a supporting base, and is mainly an upper sliding plate (upper shoe) provided on the supported structure A side. 2 and supporting base B
Lower sliding plate (lower shoe) installed on the side
3 and has a structure that relatively slides on a boundary surface (sliding surface) 4 between the plates 2 and 3.

In order to secure the close contact of the sliding surface 4, a rubber pot bearing 5 is directly connected to the back surface of either the upper sliding plate 2 or the lower sliding plate 3. When the pot bearing 5 is provided on the supported structure A side, the upper shoe case 6 is fixed to the lower surface of the supported structure A, and the pot bearing 5 and the upper sliding plate 2 are housed in the upper shoe case 6. To do. When the pot bearing 5 is provided on the support base B side, the lower shoe case 7 is fixed to the upper surface of the support base B, and the pot bearing 5 and the lower sliding plate 3 are housed in the lower shoe case 7 (see FIG. See a)).

In the sliding bearing 1 having the above structure,
In the example of FIG. 1A, a box-shaped lubricant case 8 having an open top is installed and fixed on the upper surface of the support base B, and the sliding bearing 1 is arranged in the center of the lubricant case 8. The lower sliding plate 3 is fixed to the bottom plate 8a of the lubricant case 8. The peripheral wall 8b of the lubricant case 8 is projected to the position of the pot bearing 5, and the lubricant 9 is filled to the height where the sliding surface 4 is immersed therein. Further, a dustproof cover 10 for dust protection is attached to the upper shoe case 6 such that the lower surface thereof slides on the upper end of the peripheral wall 8b. The sliding surface 4 is constantly immersed in the lubricant 9, and when the plates 2 and 3 are relatively displaced by an earthquake or the like, the lubricant 9 is automatically supplied to the sliding surface 4.

In the example shown in FIG. 1B, a lubricant enclosing bag 11 and a lower plate 12 are used instead of the lubricant case 8 and the dustproof cover 10. The lubricant enclosing bag 11 is made of a stretchable material (e.g. rubber) having airtightness and formed into a tire shape, is installed so as to surround the entire sliding bearing 1, and is filled with the lubricant 9. The upper and lower peripheral edges of the lubricant enclosing bag 11 are watertightly fixed to the lower surface of the supported structure A and the upper surface of the lower plate 12 by appropriate means.

The example of FIG. 1 (c) is a modification of FIG. 1 (a), in which the lower sliding plate 3 is omitted and the bottom plate 8a of the lubricant case 8 is used as the lower sliding plate 3. Further, the dustproof cover 10 shown in FIG. 1A is formed of a highly elastic material (for example, rubber) into a bellows-shaped dustproof cylindrical member 13.

In the example of FIG. 2A, the upper shoe case 6
A lubricant accommodating space 20 is formed therein, and the lubricant 9 is accommodated in the lubricant accommodating space 20. The upper sliding plate 2 is engaged and fixed to the lower portion of the upper shoe case 6, and a plurality of communication holes 21 are provided in the center for communicating the lubricant storage space 20 and the sliding surface 4, and the sliding surface 4 is always lubricated by the lubricant 9. Make it soaked. In addition, around the sliding surface 4, the sealing material 2
2 is provided to prevent the lubricant 9 from leaking. The sealing material 22 is made of a flexible material and is fixed to either the upper sliding plate 2 or the lower sliding plate 3 so that the relative displacement of these plates 2 and 3 can be absorbed.

The example of FIG. 2 (b) is an upside down example of FIG. 2 (a). A lubricant storage space 20 is formed in the lower shoe case 7, and a communicating hole is formed in the lower sliding plate 3. 21 is bored. In this case, the lubricant 9
In order to keep the sliding surface 4 always in contact with the sliding surface 4, an air bag 23 filled with compressed air is arranged in the lower part of the lubricant containing space 20, and the lubricant 9 is pressed upward by air pressure.

When oil and water are used as lubricants in the structure shown in FIGS. 1 and 2 and relative displacement is applied to the sliding bearing, FIG.
As shown in Fig. 3, in any structure, low friction could be maintained even after a large number of repeated displacements.

[0024]

As described above, according to the present invention, since the sliding surface of the sliding bearing is always immersed in the lubricant, the following effects are obtained.

(1) The sliding surface of the sliding member can have a low friction as compared with the case of no lubrication, and the low friction state can be stably maintained for a long time as compared with the case where oil is applied in advance. Therefore, the effect of reducing the acceleration response during an earthquake, which is much higher than that of the prior art, can be maintained, and the sliding bearing function can be sufficiently exerted for a long period of time.

(2) Since friction characteristics are stable for a long period of time regardless of surface pressure, velocity, and repeated displacement history, maintenance-free lubrication is possible, system reliability is improved, and the design of the supported object is improved. It will be easy.

(3) Since the device is inexpensive and maintenance-free, the cost can be significantly reduced as compared with the conventional case of circulating oil.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing various embodiments of a structure supporting device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the structure support device according to the present invention.

FIG. 3 is a graph showing a friction coefficient in the case of a conventional oil-free case and in the case of simply applying oil to a sliding surface.

FIG. 4 is a graph showing the coefficient of friction when the sliding surface of the present invention is immersed in oil and when the sliding surface is immersed in water.

[Explanation of symbols]

 A ... Supported structure B ... Supporting base 1 ... Sliding bearing 2 ... Upper sliding plate 3 ... Lower sliding plate 4 ... Sliding surface 5 ... Pot bearing 6 ... Upper shoe case 7 ... Lower shoe case 8 ... Lubricant case 9 ... Lubrication Agent 10 ... Dust cover 11 ... Lubricant enclosing bag 12 ... Lower plate 13 ... Bellows-like dust-proof cylindrical member 20 ... Lubricant storage space 21 ... Communication hole 22 ... Sealing material 23 ... Air bag

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Takenaka 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kazuhide Yoshikawa 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A structure support device having a structure in which a sliding surface of a sliding bearing arranged between a supporting base and a supported body is immersed in a lubricant.