JP7606275B2 - Sliding bearing - Google Patents

Description

The present invention relates to sliding bearings.

Conventionally, sliding bearings with sliding members are known that are placed between the girder and pier of a bridge. The girder slides on the sliding member, absorbing the relative displacement (misalignment) between the girder and pier caused by temperature changes, etc. The sliding member gradually wears out over many years of use, so it is necessary to determine whether the sliding member can still be used.

Patent Document 1 discloses a technology for estimating the thickness of a sliding member 51 in a sliding bearing 50 arranged between a bridge girder 101 and a pier 100. Specifically, proximity sensors 16-19 are attached to the sliding bearing 50, and detection objects 56-59 are attached on the bridge girder 101. The thickness of the sliding member 51 is estimated based on the distance to the detection objects 56-59 detected by the proximity sensors 16-19. In this way, based on the estimated thickness of the sliding member 51, it can be determined whether or not the sliding bearing 50 is usable while it is in its existing state, i.e. without removing the sliding bearing 50 from between the bridge girder 101 and the pier 100.

JP 2017-8616 A

However, since the detection objects 56-59 are attached to the bridge girder 101, if a railroad track or road is installed on the bridge girder 101, the detection objects 56-59 must be attached to the railroad track or road. To install the detection objects 56-59 on the railroad track, the work must be done at night after the railway service has stopped. Also, to install the detection objects 56-59 on the road, the road must be at least partially closed to traffic. Therefore, it is not easy to estimate the thickness of the sliding member 51.

The present invention was made to solve the above-mentioned problems, and aims to provide a sliding bearing that makes it easy to determine whether it is usable or not while in its existing state.

In order to achieve this purpose, the sliding bearing of the present invention is arranged between a bridge girder and a pier or an abutment of a bridge, and comprises a main body and a sliding member provided on the side of the main body where it abuts with the bridge girder or the pier or the abutment, and a remaining amount confirmation portion is formed on the outer surface of the side of the sliding member in a portion corresponding to the thickness of the sliding member , for confirming the thickness of the sliding member.

According to the sliding bearing of claim 1, a remaining amount checking portion for checking the thickness of the sliding member is formed on the outer surface of the side surface of the sliding member of the sliding bearing, in a portion corresponding to the thickness of the sliding member. This has the effect of making it easy to determine whether the sliding bearing is usable in its existing state by checking the remaining amount checking portion from the outside of the side surface of the sliding member. The remaining amount checking portion is not limited to being formed across the top and bottom of the outer surface of the side surface of the sliding member, but may be formed on a part of the outer surface of the side surface of the sliding member. For example, it may be formed from the lower end to the middle of the upper part of the outer surface of the side surface of the sliding member, from the upper end to the middle of the lower part of the outer surface of the side surface of the sliding member, or from the middle of the lower part to the middle of the upper part of the outer surface of the side surface of the sliding member.

According to the sliding bearing of claim 2, the remaining amount confirmation part is configured with a gap formed on the side of the sliding member by forming the outer surface of the side surface of the sliding member more inward than the outer surface of the side surface of the main body, thereby achieving the following effect in addition to the effect achieved by claim 1. When a gap gauge or the like is placed so as to be inserted into the gap, if the gap gauge or the like can be inserted, it can be determined that the sliding bearing is usable, but if the gap gauge or the like cannot be inserted into the gap, it can be determined that the time to replace the sliding bearing has arrived.

According to the sliding support described in claim 3, the gap is formed in a substantially rectangular shape when viewed from the side in cross section, so that the upper and lower ends of the gap are formed substantially flat. This provides the effect of claim 2, as well as the effect that the gap has a substantially uniform height in the depth direction, and the height of the substantially rectangular gap can be set as the wear limit of the sliding member.

According to the sliding bearing described in claim 4, the remaining amount confirmation portion is formed by making the color of the outer surface of the side surface of the sliding member different from the color of the outer surface of the side surface of the main body, thereby, in addition to the effects achieved by claims 1 to 3, it has the effect that if the difference in color between the outer surface of the side surface of the sliding member and the outer surface of the side surface of the main body is visible, it can be determined that the sliding bearing is usable, and conversely, if the difference in color is not visible, it can be determined that the time to replace the sliding bearing has arrived.

According to the sliding bearing described in claim 5, the remaining amount confirmation portion is formed by marking the boundary between the outer surface of the side surface of the sliding member and the outer surface of the side surface of the main body portion as a line, thereby providing the effects of claims 1 to 4, in addition to the effects that can be obtained, if the line is visible, it can be determined that the sliding bearing is usable, and conversely, if the line is not visible, it can be determined that the time to replace the sliding bearing has arrived.

According to the sliding bearing described in claim 6, the remaining amount confirmation portion is formed around the entire outer surface of the side surface of the sliding member, so that by checking the remaining amount confirmation portion from any position on the outer surface of the side surface of the sliding member, it is possible to determine whether the sliding bearing is usable or not, which has the effect of improving the workability of such work in addition to the effect achieved by any of claims 1 to 5.

1A is a side view of a portion of a bridge where a sliding bearing is provided, and FIG. 1B is an enlarged view of portion Ib of FIG. 1A is a top view of the sliding bearing, and FIG. 1B is a cross-sectional view taken along line IIb-IIb in FIG. 1A is a cross-sectional view of a sliding support in a modified example in which the side of the sliding member from the lower end to partway to the upper part is formed inwardly relative to the main body, (b) is a cross-sectional view of a sliding support in another modified example in which the side of the sliding member and part of the side of the main body are formed inwardly, and (c) is a cross-sectional view of a sliding support in yet another modified example in which the upper part of the side of the sliding member is formed inwardly. 1A is a side view of a modified example in which paint is applied to the side of a sliding member, and FIG. 1B is a side view of another modified example in which painting is applied to the lower end of the side of the sliding member. 13 is a cross-sectional view of a sliding bearing in a modified example in which a sliding member is provided at the lower part of the sliding bearing. FIG.

Below, preferred embodiments of the present invention will be described with reference to the attached drawings. Fig. 1(a) is a side view of a portion of bridge B where sliding bearing 1 is provided, and Fig. 1(b) is an enlarged view of portion Ib of Fig. 1(a). Bridge B is a structure that is erected over a river, a valley, etc., and connects transportation routes such as railways and roads. Bridge B is constructed by supporting bridge girders 10 that form the transportation route with piers 11 erected from the river, valley, etc.

The sliding bearing 1 is provided between the bridge girder 10 and the pier 11, and is a member that absorbs the relative displacement (misalignment) of the bridge girder 10 and the pier 11 due to temperature changes, etc. Specifically, the sliding bearing 1 is disposed between the lower surface of the upper shoe 2 disposed on the lower surface of the bridge girder 10, and the upper surface of the lower shoe 3 disposed on the upper surface of the pier 11. The shapes of the lower surface of the upper shoe 2 and the upper surface of the lower shoe 3 are formed to match the shapes of the upper and lower surfaces of the sliding bearing 1 described below; specifically, the lower surface of the upper shoe 2 is formed flat, and the upper surface of the lower shoe 3 is formed in a concave hemisphere.

As shown in FIG. 1(b), the sliding bearing 1 is composed of a main body 1a and a sliding member 1b formed on the upper part of the main body 1a. The sliding member 1b is a member that absorbs the relative displacement between the sliding member 1b and the upper shoe 2, i.e., the relative displacement between the bridge girder 10 and the pier 11, by sliding the lower surface of the upper shoe 2 that is in contact with its upper surface.

The side of the sliding member 1b is formed inside the side of the main body 1a. As a result, when the sliding support 1 is placed between the upper shoe 2 and the lower shoe 3, a gap S is formed between the lower surface of the upper shoe 2, the side of the sliding member 1b, and the upper end surface 1a1 of the main body 1a.

The structure and shape of the sliding bearing 1 will now be described with reference to Figure 2. Figure 2(a) is a top view of the sliding bearing 1, and Figure 2(b) is a cross-sectional view taken along the line IIb-IIb in Figure 2(a). As shown in Figure 2, the upper part of the sliding bearing 1 is formed in a roughly cylindrical shape, and the lower part is formed in a hemispherical shape that is continuous with the upper part. The upper surface of the sliding bearing 1 is formed in a flat shape.

A sliding member 1b is formed on the upper part of the sliding bearing 1, i.e., the part where it abuts against the upper shoe 2 in FIG. 1. Specifically, multiple holes are formed on the upper surface of the sliding bearing 1, and solid lubricant 1b1 is filled into each hole. The height H of the solid lubricant 1b1 is, for example, 1 mm. That is, in the sliding bearing 1, the height H of the solid lubricant 1b1 is the thickness of the sliding member 1b.

The side of the sliding member 1b is formed inside the side of the main body 1a over its entire circumference (i.e., the outer periphery). Furthermore, the shape of the side of the sliding member 1b is formed to be approximately vertical. The upper end surface 1a1 is formed to connect the lower end of the side of the sliding member 1b and the upper end of the side of the main body 1a approximately horizontally. The horizontal width W of the upper end surface 1a1 is also, for example, 1 mm.

By forming the side surface and upper end surface 1a1 of the sliding member 1b of the sliding bearing 1 in this way, as shown in FIG. 1(b), when the sliding bearing 1 is placed between the upper shoe 2 and the lower shoe 3, a gap S with a substantially rectangular side cross-sectional view is formed around the entire circumference of the side surface of the sliding member 1b and from top to bottom. If a gap gauge with the same thickness as the lower limit thickness (e.g., 0.01 mm) of the sliding member 1b that is usable can be inserted into the gap S, it can be determined that the sliding member 1b is usable because the thickness has not reached the lower limit. On the other hand, if a gap gauge cannot be inserted across the gap S, it can be determined that the thickness of the sliding member 1b has reached the lower limit, and it is time to replace the sliding bearing 1. This makes it possible to easily and accurately determine whether the sliding bearing 1 is usable or not while it is in its existing state, i.e., without removing the sliding bearing 1 from between the bridge girder 10 and the pier 11.

In addition, since the gap S is formed around the entire circumference of the side surface of the sliding member 1b, it is possible to determine whether the sliding bearing 1 is usable or not by inserting a gap gauge from any position on the side surface of the sliding member 1b. This improves the workability of such work. Furthermore, since the gap S is formed in a substantially rectangular shape when viewed in cross section from the side, the upper and lower ends of the gap S are formed in a substantially flat shape. As a result, the gap S has a substantially uniform height in the depth direction, and the height of the substantially rectangular gap S can be set as the wear limit of the sliding member 1b.

In addition, by visually checking for the presence of the gap S, it is easy to determine whether the sliding bearing 1 is usable or not in its current state. Specifically, by shining light from a flashlight or the like onto the upper portion of the side of the sliding bearing 1, if the gap S is visible, it can be determined that the sliding bearing 1 is usable, whereas if the gap S is not visible, it can be determined that it is time to replace the sliding bearing 1.

The present invention has been described above based on the embodiments, but the present invention is in no way limited to the above-mentioned embodiments, and it can be easily imagined that various improvements and modifications are possible within the scope of the invention without departing from its spirit.

In the above embodiment, the gap S is formed from the top to the bottom of the side surface of the sliding member 1b. However, the gap S is not necessarily limited to being formed from the top to the bottom of the side surface of the sliding member 1b. For example, as in the sliding support 21 in FIG. 3(a), the side surface of the sliding member 1b may be formed from the bottom to the middle of the top on the inside of the main body 1a, and a gap S1 may be formed from the bottom to the middle of the top of the side surface of the sliding member 1b. Also, a gap S1 may be formed from the middle of the bottom to the middle of the top of the side surface of the sliding member 1b.

Also, as in the sliding bearing 31 of FIG. 3(b), the side of the sliding member 1b and part of the side of the main body 1a may be formed on the inside. In this case, it is preferable to form the height between the lower end of the sliding member 1b and the upper end surface 1a1 of the main body 1a slightly thinner than the thickness of the gap gauge inserted into the gap S. By forming it in this way, when the sliding member 1b, i.e., the solid lubricant 1b1, is completely worn out, it becomes impossible to insert the gap S, and it is determined that the time to replace the sliding bearing 31 has arrived, so the sliding bearing 31 can be used efficiently.

Furthermore, like the sliding bearing 41 in FIG. 3(c), only the upper part of the side of the sliding member 1b may be formed on the inside. By forming it in this way, even if it becomes impossible to insert a gap gauge into the gap S and it is determined that it is time to replace the sliding bearing 41, the solid lubricant 1b1 has not worn out completely. Therefore, even if it takes time from the time of making such a determination to the time of replacing the sliding bearing 41, as long as the solid lubricant 1b1 remains, the sliding member 1b and the upper shoe 2 can slide.

In addition, instead of forming a gap S, the boundary between the sliding member 1b and the main body 1a may be clearly indicated on the side of the sliding bearing 1. For example, as in sliding bearing 51 in FIG. 4(a), paint C may be applied to the side of sliding member 1b to make the color of the side of sliding member 1b different from the color of the side of the main body 1a, or as in sliding bearing 61 in FIG. 4(b), a line L may be drawn at the bottom end of the side of sliding member 1b to indicate the boundary between the side of sliding member 1b and the side of the main body 1a as a line.

By visually checking the paint C of the sliding bearing 51 and the line L of the sliding bearing 61, it is easy to determine whether the sliding member 1b is usable or not in its existing state. In this case, by making the paint C of the sliding bearing 51 and the line L of the sliding bearing 61 the opposite color (complementary color) of the color of the main body 1a or a fluorescent color, the paint C and the line L can be more clearly seen. In addition, the gap S, paint C, and line L may be provided in an appropriate combination for one sliding bearing.

In the above embodiment, the sliding member 1b is formed on the upper part of the sliding bearing 1. However, this is not necessarily limited to this. For example, as in the sliding bearing 71 of FIG. 5, the sliding member 1e can also be formed on the lower surface of the sliding bearing 71 by filling the lower surface of the sliding bearing 71 with solid lubricant 1e1. In this case, too, the side of the lower sliding member 1e can be formed inside the main body 1a. As a result, when the sliding bearing 71 is placed between the upper shoe 2 and the lower shoe 3, a gap is formed between the upper surface of the lower shoe 3 and the lower surface of the sliding member 1e, and by inserting a gap gauge into this gap, it can be determined whether the sliding member 1e (solid lubricant 1e1) can be used.

Furthermore, unlike the sliding support 71, the present invention is not limited to a structure in which both the sliding member 1b and the lower sliding member 1e are provided, and it is also possible to provide only the sliding member 1e.

In the above embodiment, the gap S is formed around the entire periphery of the side surface of the sliding member 1b. However, this is not necessarily limited to this, and the gap S may be formed only in a portion of the side surface of the sliding member 1b.

In the above embodiment, the side surface of the sliding member 1b is formed substantially vertically, and the upper end surface 1a1 is formed substantially horizontally. However, this is not necessarily limited to this, and the side surface of the sliding member 1b may be formed in an inclined or curved shape. In addition, the upper end surface 1a1 and the side surface of the sliding member 1b may be formed in a continuous curved shape or in a stepped shape, etc.

In the above embodiment, a gap gauge is inserted into the gap S to determine whether the sliding bearing 1 can be used. However, the means for determining whether the sliding bearing 1 can be used is not necessarily limited to a gap gauge, and may be a plate-shaped member other than a gap gauge or a rod-shaped member.

In the above embodiment, the sliding bearing 1 is disposed between the bridge girder 10 and the pier 11 of bridge B. However, the location of the sliding bearing 1 in bridge B is not limited to between the bridge girder 10 and the pier 11, and it may be disposed, for example, between the bridge girder 10 and the abutment. Furthermore, the location of the sliding bearing 1 is not limited to bridge B, and it may be disposed, for example, between structures other than bridge B, or it may be applied to a seismic isolation device for a building, etc.

1, 21, 31, 41, 51, 61, 71 Sliding support 1a Main body 1b Sliding member S, S1 Gap (remaining amount confirmation part)
C Paint (remaining amount check section)
L line (remaining amount check section)
B Bridge 10 Bridge girder 11 Bridge pier

Claims (6)

A sliding bearing is disposed between a girder and a pier or an abutment of a bridge, and includes a main body and a sliding member provided on the side of the main body that abuts against the girder or the pier or the abutment,
A sliding support characterized in that a remaining amount confirmation portion for confirming the thickness of the sliding member is formed on the outer surface of the side of the sliding member , in a portion corresponding to the thickness of the sliding member . The sliding support according to claim 1, characterized in that the remaining amount confirmation portion is configured by forming the outer surface of the side surface of the sliding member more inward than the outer surface of the side surface of the main body portion, thereby having a gap formed on the side of the sliding member. The sliding bearing according to claim 2, characterized in that the gap is formed in a substantially rectangular shape when viewed from the side in cross section. 4. The sliding bearing according to claim 1, wherein the remaining amount check portion is formed by making the color of the outer surface of the side surface of the sliding member different from the color of the outer surface of the main body portion. The sliding bearing according to any one of claims 1 to 4, characterized in that the remaining amount confirmation portion is formed by marking the boundary between the outer surface of the side surface of the sliding member and the outer surface of the side surface of the main body portion as a line. 6. The sliding bearing according to claim 1, wherein the remaining amount check portion is formed on the entire circumference of an outer surface of a side surface of the sliding member.

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