JP2948192B1 - Detachable bearing - Google Patents

Abstract

An object of the present invention is to provide a bearing which has a detachable internal structure and is easy to repair and maintain. A bearing that fixes a base spot (4) removably without providing concave portions on the upper surface of a lower anchor plate (3) and the lower surface of an upper anchor plate (2). Since the concave portion of each anchor plate is eliminated, jack-up is required only several millimeters, and the internal structure of the base spot 4 can be easily replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bridge, a highway,
The present invention relates to a bearing widely used for applications of structures such as buildings and piping supports.

[0002]

2. Description of the Related Art Conventionally, bridges and the like have used a bearing in which an elastic body and a piston are disposed between an upper anchor plate fixed to an upper structure and a lower anchor plate fixed to a lower structure. . Such a bridge support includes a fixed support fixed to a bridge girder as shown in FIG.
There is a movable bearing that follows the expansion and contraction of a bridge girder.

[0003] The fixed bearing 1 shown in FIG. 8 is attached to a bridge or a pier by upper and lower anchor bolts 13 and 14. The fixed bearing 1 has an upper anchor plate 2 and a lower anchor plate 3. A concave portion is provided on the upper surface of the lower anchor plate 3, and a base spot 4 is fitted into the concave portion. An elastic body 6 that absorbs bending and distortion while supporting a load acting on an upper structure such as a structure is accommodated inside the base spot 4, and a sealing member (seal ring) 7 is provided thereon to prevent the elastic body 6 from protruding. , And the piston 8 is further inserted thereon. A top plate 5 is fitted into a concave portion having a desired diameter and length provided on the lower surface of the upper anchor plate 2, and a piston 8 is fitted into a concave portion provided on the lower surface of the top plate 5. Note that the top plate 5 is not always necessary, and the upper anchor plate 2 can substitute the top plate 5.

On the other hand, a concave portion is also provided on the lower surface of the upper anchor plate 2 of the movable bearing 9 shown in FIG. 9, and a top plate 5 is provided in this concave portion, and a lubricating member 10 is joined to the lower surface. ing. A groove 5 ′ having a desired length and depth is provided on the lower surface of the top plate 5, and a center key 12 provided on a piston 8 having a lower structure and having an overhang corresponding to the groove 5 ′ is mounted. Controls the movement due to the horizontal load in a specific direction. On the other hand,
A concave portion is also provided on the upper surface of the lower anchor plate 3, and the bay spot 4 is fitted in this concave portion. An elastic body 6 that absorbs bending and distortion while supporting a load acting on an upper structure such as a building is accommodated in the interior of the base spot 4, and a seal ring 7 is fitted thereon to prevent the elastic body 6 from protruding. Further, the piston 8 is mounted thereon. The center key 12 is provided on the upper surface of the piston 8, and the piston 8 excluding the projecting portion of the center key 12 is provided.
The sliding member 11 is joined to the upper surface of. And
When the sliding member 11 on the upper surface of the piston 8 and the lubricating member 10 on the lower surface of the top plate 5 are in contact with each other and receive a horizontal load, they slide along the center key 12.

[0005] When replacing the elastic body 6 provided in the base spot 4 of the fixed bearing 1 and the movable bearing 9 due to aging or replacing or maintaining the base spot itself, the upper anchor plate 2 and the lower anchor are required. In the design in which the base plate 4 is taken out from the space between the plate 3 and the top plate 5, it is necessary to take out both the base spot and the top plate.
For example, in FIG. 8, at least the depth R1 of the recess of the lower anchor plate 3 and the depth R2 of the recess of the top plate 5 or the depth R of the recess of the upper anchor plate 2
You have to jack up the height of the sum with 3.

The depth of the concave portions of the upper and lower anchor plates 2 and 3 is generally adjusted in accordance with the magnitude of the horizontal load applied to the bearing. Therefore, for example, the larger the structure such as a bridge or a road, the more naturally the bearing receives. The horizontal load also increases, and the depth of the concave portion needs to be further increased. Therefore,
In the case of increasing the size of the above-mentioned structure, the height of the jack-up must be appropriately increased in accordance with the size of the structure when replacing or maintaining the fixed or movable bearing. The horizontal load on a bearing used on a highway or the like reaches several hundred tons, and for example, as shown in the example of FIG. 8, a total of 34 to 3 of R1 and R2 or R3 is used.
A depth of each recess of 7 mm is required. Therefore, the jack-up needs to be at least 34 to 37 mm or more.

However, if the jack-up exceeds 10 mm, the traffic of automobiles and the like is extremely hindered.
There are problems such as the need to restrict traffic, and the time and cost required for jacking up and jacking down are enormous.

[0008]

Therefore, there has been a demand for a technique for minimizing jacking up of a bridge girder and the like as much as possible without limiting traffic and minimizing the time and cost required for jacking up and jacking down. Further, in recent years, from the viewpoint of earthquake resistance, a high-strength bearing device in which the concave portion is further deepened has been required.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, the present invention
A bearing having a vespot between an upper anchor plate fixed to an upper structure and a lower anchor plate fixed to a lower structure, wherein the vespot is disposed inside the elastic body and the elastic body. And a bearing having a base which is detachably fixed to an upper surface of the lower anchor plate by a detachable fixing member.

In a preferred embodiment, the bearing is a fixed bearing, and an upper peripheral edge of the piston is detachably fitted in a concave portion on a lower surface of the upper anchor plate.

In a further preferred embodiment, the bearing is a fixed bearing, and the lower surface of the upper anchor plate has substantially no recess for fitting the piston, and the piston is fixed to the upper anchor plate. Is fixed detachably so that the upper surface of the piston and the lower surface of the upper anchor plate are in contact with each other by a detachable fixing member arranged on the lower surface of the piston.

In a preferred embodiment, the bearing is a movable bearing, and the top plate is detachably fixed to a concave portion on a lower surface of the upper anchor plate, and the lower surface of the top plate is a piston. Abuts the top surface of the

In a more preferred embodiment, the bearing is a movable type bearing, and the lower surface of the upper anchor plate has substantially no recess for fitting the top plate, and the top plate is A detachable fixing member disposed on the lower surface of the upper anchor plate is detachably fixed to the lower surface of the upper anchor plate such that the lower surface of the top plate is in contact with the upper surface of the piston.

[0014] In a preferred embodiment, a lubricating member is provided on a lower surface of the top plate and / or an upper surface of the piston.

In a more preferred embodiment, a surface (an upper anchor plate and / or a lower anchor plate) to which the detachable fixing member is fixed has a concave portion in which the fixing member can be disposed.

In a further preferred embodiment, a flange is provided on an outer portion of the fixing member, and a removal screw is provided on the flange.

[0017] In a preferred embodiment, the bearing is a one-way movable bearing. With these inventions,
The above problem is solved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The bearing of the present invention comprises a base spot (internal structure) in which an elastic body and a piston are arranged between an upper anchor plate and a lower anchor plate such that one side of the piston is exposed. It is a bearing that does not require a large jack-up as in the prior art and can be taken out very easily with a jack-up of only a few millimeters.

The bearings to which the present invention can be applied include fixed bearings and movable bearings, and the movable bearings include omnidirectional movable bearings and one-way movable bearings. Bearings are included.

In the bearing of the present invention, that is, the fixed bearing and the movable bearing, the baespot is attached and detached by a detachable fixing member without providing a concave portion for fitting or fixing the baspot on the upper surface of the lower anchor plate. It is freely fixed and held on the upper surface of the lower anchor plate.
The shape of the base pot is not particularly limited, and is circular, oval,
Any shape such as a square and a rectangle may be used, but a circular shape is preferable in terms of strength, manufacturing aspect, and the like. Removable fixing members for fixing the base spot on the lower anchor plate include a bolt member, a ring-shaped member, a semicircular member,
An elliptical member, an arc-shaped member, a rod-shaped member, and the like can be given. These members are appropriately selected and used according to the shape of the base spot.

The fixed holding of the base spot can be performed only by the fixing bolt. However, it is more preferable to use a fixing member other than the bolt in combination from the viewpoint of strength against a horizontal load. Ring members, semicircular members, elliptical members, arc members, rod members, etc. other than bolts may be fixed to the upper surface of the lower anchor plate outside the baespot with bolts. Preferably, a concave portion (groove) is provided on the upper surface of the lower anchor plate outside the base spot, a fixing member is inserted (fitted) into the concave portion (groove), and the fixing member is fixed to the upper surface of the lower anchor plate with fixing bolts. I do. By using this arrangement method, the strength of the fixing member can be increased. The size (material, height, width, etc.) of the fixing member and / or the size of the recess (groove) into which the fixing member is inserted may be determined in consideration of the horizontal load.

As shown in FIGS. 8 and 9, there are other methods of fixing the base plate and the top plate, such as using a bolt as shown in FIG. However, in the method using bolts, the structure of the base spot becomes large, and when the horizontal load is large, the number and diameter of bolts are required to withstand the load, which may be uneconomical. As in the present invention, by providing a groove in each anchor plate and fitting the fixing member, the structure can withstand a horizontal load, which is more economical. The height and width of the fixing member and the depth of the groove
Determined according to the horizontal load.

The removal of the base spot is performed by removing a fixing bolt. When the fixing member is fixed by providing a concave portion (groove), a flange portion is provided outside the fixing member, and the flange portion is provided. The fixing member can be easily taken out from the concave portion (groove) by tightening the disassembly bolt attached to the fixing member. The above example is illustrated, for example, by the structure of the lower anchor plate of FIGS.

The upper surface of the lower anchor plate is not substantially a concave portion for fitting or fixing the base spot. However, if necessary, the concave portion and / or the position for determining the arrangement position of the base spot may be provided. A concave portion (guide or groove) having a depth necessary for facilitating taking in and out of the base spot may be provided.

When the bearing of the present invention is a fixed bearing, as long as it has the structure of the lower anchor plate described above, the piston may be removably fitted in the recess on the lower surface of the upper anchor plate as in the prior art. . Moreover, it may have a top plate.

However, the lower surface of the upper anchor plate is not provided with a concave portion into which the piston is removably fitted, and the lower surface of the upper anchor plate is brought into contact with the lower surface of the upper anchor plate. More desirably, it is fixed detachably by the detachable fixing member provided. By not providing recesses (grooves) in the upper anchor plate, jacking up the depth of the recesses (grooves) becomes unnecessary, and only a few millimeters of jack up can be used to replace or repair the base spot. is there. Examples of these are shown in FIGS. 1, 3, 4, and 5.

The detachable fixing member provided on the lower surface of the upper anchor plate may be appropriately selected according to the shape of the piston. In addition to the same fixing member as in the above-described lower anchor plate, for example, FIG. A stopper ring having a shape as shown in FIGS. 1, 3 and 4 may be used. As in the case of the lower anchor plate, these fixing members can be fixed by providing recesses (grooves) on the lower surface of the upper anchor plate outside the surface that comes into contact with the piston.

The fixing member may be removed by removing the fixing bolt so that the fixing member falls naturally.
When the concave portion (groove) is provided, the fixing member can be taken out by providing a flange outside the fixing member and tightening up the disassembly bolt attached to the flange similarly to the above. Further, a screw for attaching the disassembly bolt is provided on the circumference of the fixing bolt without providing the flange portion, and the fixing member can be easily taken out from the concave portion (groove).

Although not substantially a concave portion for fitting or fixing the piston on the lower surface of the upper anchor plate, the arrangement position of the piston is determined if necessary.
And / or a guide comprising a groove recess having a shallow depth necessary to facilitate in / out of the base spot may be provided.

In the case where the bearing of the present invention is a movable bearing, a structure in which a top plate is mounted in a concave portion on the lower surface of the upper anchor plate may be used as long as the structure has the lower anchor plate of the present invention.

However, when a concave portion for mounting the top plate is not provided on the lower surface of the upper anchor plate, and the top plate is detachably fixed by a detachable fixing member, the jack-up is prevented by the concave portion. It is more preferable because it is completed.

The detachable fixing member provided on the lower surface of the upper anchor plate may be appropriately selected according to the shape of the top plate, and the same fixing member and the disposing method as in the case of the lower anchor plate are used. Applied. In addition, a concave portion, for example, a groove is provided on the lower surface of the upper anchor plate, and a fixing member is fixed in the groove, and a flange portion is provided outside the fixing member, a disassembly bolt is attached to the flange portion, and the disassembly bolt is tightened. Raising and removing the fixing member is performed in the same manner. FIG. 6 shows an example of the moving bearing.

Further, on the lower surface of the upper anchor plate,
A guide may be provided which consists essentially of a groove recess having a shallow depth necessary to facilitate positioning and / or attachment and detachment of the top plate.

When the moving bearing is an omnidirectional moving bearing, both the top plate and the piston need only be flat.
When the moving bearing is a one-way moving bearing, a projection (center key) is provided on the piston, and a recess (groove) is provided on the top plate so that the center key is mounted in the recess of the top plate. I just need. In this case, a sliding member may be attached to the center key, or PTFE may be formed on the piston from the surface of the concave portion of the top plate that contacts the center key (sliding member) to the surface that contacts the top plate and the piston. A sliding member configured may be attached. This example is shown in FIG.

As the material of each member used in the bearing of the present invention, an ASTM (American Society for Testing and Materials) standard weather-resistant steel material, for example, ASTM-A standard (ASTM-A57)
2, A578) or JIS SMA standard products such as SM490, SMA490AW, SMA490B
W, SMA490CW, SMA490AP, SMA49
Steel materials such as 0BP and SMA490CP are preferably used, but are not limited thereto, and may be determined in consideration of the size of the structure, the place where the structure is used, and the like. In addition, examples of the elastic body used for the base spot include chloroprene rubber and natural rubber.

A lubricating member made of synthetic resin such as PTFE or a mirror-finished stainless steel plate is bonded or bonded to the lower surface of the top plate and the upper surface of the piston.
The lubricating member also includes a case in which the surfaces of the lower surface of the top plate and the upper surface of the piston are mirror-finished to reduce friction in addition to being bonded or joined.

The material of the sealing member is not particularly limited.
Those having excellent slidability, such as brass, PTFE, and PE, may be used.

[0038]

The bearing according to the present invention is a bearing having a base spot (internal structure) in which an elastic body and a piston are arranged between an upper anchor plate and a lower anchor plate such that one surface of the piston is exposed. However, since this base spot is detachably fixed by a detachable fixing member without providing a concave portion on the upper surface of the lower anchor plate, removing the fixing member facilitates taking out the base spot, At the time of taking out, the jack-up is required to be about half of the conventional case, so that there is also an economic effect that the cost of maintenance and the like is reduced.

Further, the bearing of the present invention has no recess on the lower surface of the upper anchor plate (top plate) as well as the recess on the upper surface of the lower anchor plate. By simply jacking up and removing the fixing member, the base spot (internal structure) can be taken out.

Furthermore, the required seismic strength can be sufficiently satisfied only by adjusting the size such as the thickness of the fixing member.

[0041]

Hereinafter, the present invention will be described with reference to examples.
These examples are only one aspect of the present invention, and it goes without saying that the present invention is not limited to these examples.

(Embodiment 1) FIG. 1 is a partially cutaway view of a fixed bearing according to the present invention. Upper and lower anchor bolts 13 and 14
Is attached to a structure such as a bridge or a pier.
When the structure is concrete, it is embedded and attached to the concrete. The number, diameter, and length of the anchor bolts are determined in consideration of the magnitude of the lateral load (horizontal load). The joining of the anchor bolts 13 and 14 with the upper anchor plate 2 and the lower anchor plate 3 is performed by providing holes on the plate side, fitting the bolts, and welding and fixing. The upper anchor plate 2 and the lower anchor plate 3 are designed to be square or rectangular.
On the other hand, the baespot 4, the piston 8, the elastic body (chloroprene rubber) 6, and the seal member 7 are designed in a circular shape.

As a fixing member for the base spot 4,
For example, an upper stopper ring 1 which is a circular ring body
5 and a lower stopper ring 16 are used. The upper stopper ring 15 and the lower stopper ring 16
Each is fixed with an appropriate fixing bolt 19. The upper stopper ring 15 and / or the lower stopper ring 16 are each divided into two semicircular rings, and if used in pairs therewith, attachment / detachment becomes easier. A flange portion 17 is provided on an outer diameter portion of the lower stopper ring 16 by, for example, welding, and a disassembly bolt 18 is provided on the flange portion 17. The flange 17 may be integrated with the lower stopper ring 16.

The fixed bearing 1 according to the first embodiment has a ring-shaped groove into which an upper stopper ring 15 and a lower stopper ring 16 are respectively fitted on the lower surface of the upper anchor plate 2 and the upper surface of the lower anchor plate 3, respectively. A stopper ring is attached to the groove to receive the lateral load of the bearing.

It is preferable that the lower surface of the upper anchor plate 2 and the upper surface of the lower anchor plate 3 are flush with each other except for the groove. If the height of the outer peripheral edge (outer portion of the groove) of the lower surface of the upper anchor plate 2 and the upper surface of the lower anchor plate 3 is lower than the inner peripheral edge (inner portion of the groove), the strength tends to be insufficient, and conversely, If the peripheral portion is high, it becomes difficult to attach and detach.

FIG. 2 is a plan view of the lower stopper structure of the bearing of the present invention. The lower stopper ring 16 is fixed by a fixing bolt 19, and a disassembly bolt 18 is provided on the flange 17 of the lower stopper ring 16 so that the lower stopper ring 16 can be easily removed from the groove of the stopper ring.

When removing the internal structure of the bearing for maintenance or repair of the bearing of the present invention, the fixing bolt 19 is required.
Remove. When the fixing bolt 19 is removed, the upper stopper ring 15 can drop naturally. The lower stopper ring 16 is pulled out of the groove by tightening the disassembly bolt 18.
After that, the internal structure (Baspot 4) can be taken out by slightly jacking up the upper structure. According to the configuration of the present invention, since the concave portions for mounting the vapor spots are not provided on the upper and lower anchor plates unlike the conventional structure, it is not necessary to consider the depth of the concave portions. Jacking up to take out can be done in just a few millimeters. In addition, the excellent technical effect that can easily take out the base spot 4 can be achieved without cutting off traffic, and the excellent effect that costs can be reduced both in terms of time and economy. Occurs.

(Embodiment 2) FIG. 3 shows a fixed bearing according to another embodiment of the present invention. The second embodiment provides an economical design in which the diameter of the piston 8 is reduced in FIG. 1 to reduce material costs and reduce shaving. In the second embodiment, the upper stopper ring 15 has a flange 15 ′ having an inner diameter slightly larger than the outer diameter of the outer peripheral upper edge of the piston 8, and the inner peripheral wall of the flange 15 ′ It is designed to abut the part. The distance between the lower end surface of the upper stopper ring 15 and the upper end surface of the base spot 4 is slightly wider than the depth of the groove of the upper anchor plate 2 so that the upper stopper ring 15 comes off when the fixing bolt 19 is removed. Make up. The attachment and detachment of the lower stopper ring 16 can be performed in the same manner as in the first embodiment.

(Embodiment 3) FIG. 4 shows a fixed bearing according to still another embodiment, in which a flange portion 15 "of the upper stopper ring 15 is provided at the outer edge of the upper stopper ring 15, and the upper stopper ring 15 is This is an example in which a fixing bolt 19 is used to fix the upper anchor plate 2 by a portion 15 ″.

(Embodiment 4) FIG. 5 shows another embodiment of a fixed bearing. This fixed bearing has a top plate 5 as in the conventional construction. The top plate 5 has an outer diameter corresponding to the inner diameter of the upper stopper ring 15 and has a recess having a desired depth and diameter for mounting the piston 8.
By the same operation as in the first embodiment (FIG. 1), the upper and lower fixing bolts 1 are used.
9 and remove the upper and lower stopper rings 15 and 16
By removing, the internal structure can be taken out with a little jack-up.

(Embodiment 5) FIG. 6 is a partially cutaway view of a one-way moving type support according to the present invention. The piston 8 is provided with a center key 12 having a predetermined overhang. The top plate 5 is provided with an appropriate groove so that the center key 12 can be mounted in the groove. A sliding member 21 made of PTFE or the like is attached to the center key 12 as shown in FIG. Further, the top plate 5 and the piston 8 are separated from the surface of the groove inner wall of the top plate 5 which comes into contact with the sliding member 21.
Top pre over the surface (entire surface other than the grooves) which bets are in contact
A lubricating member 10 such as stainless steel is attached to the lower surface of the port 5 , and a PT 8
A sliding member 11 made of FE is provided by coating or the like. This allows the upper structure to move smoothly relative to the lower structure when receiving a horizontal load.

In the one-way movable bearing of FIG. 6, the upper anchor plate 2 and the lower anchor plate 3 are designed to be square or rectangular. On the other hand, the baespot 4, the piston 8, the elastic body (chloroprene rubber) 6, and the seal member 7 are designed in a circular shape. The lower surface of the upper anchor plate 2 is provided with a groove in which a rectangular parallelepiped (bar-shaped) stopper plate 20 having a desired length is fitted.
Fixed at. The upper surface of the lower anchor plate 3 is provided with a groove into which the lower stopper ring 16 is fitted.
Fixed at 9. The lower surface of the upper anchor plate 2 and the upper surface of the lower anchor plate 3 are formed on the same plane except for a groove in which the stopper plate 20 and the lower stopper ring 16 are mounted. If the lower stopper ring 16 is divided into two and a pair of semicircular rings is used, attachment and detachment becomes easier. A flange portion 17 is provided on an outer diameter portion of the lower stopper ring 16, and a disassembly bolt 18 is provided on the flange portion 17.

The bearing receives a horizontal load and moves along with the center key 12 to reduce the horizontal load.

The plan view of the lower stopper is the same as FIG. The lower stopper ring 16 is fixed by a fixing bolt 19, and the disassembly bolt 18 is attached to the lower stopper ring 1.
6 is provided on the flange portion 17.

When removing the inside of the support for maintenance or repair of the support of the present invention, the fixing bolt 19 is removed. The upper stopper ring 15 can drop naturally. The lower stopper ring 16 is pulled out of the groove by tightening the disassembly bolt 18. Then, the internal structure (basspot) can be taken out by slightly jacking up the upper structure.

[0056]

According to the present invention, the base spot is detachably fixed to the upper surface of the lower anchor plate by the detachable fixing member, so that the concave portion conventionally provided in the lower anchor plate becomes unnecessary. It is not necessary to jack up at least the depth of the concave portion of the lower anchor plate.

In addition, the bearing of the present invention has no recess on the lower surface of the upper anchor plate (top plate) as well as the recess on the upper surface of the lower anchor plate. By simply jacking up and removing the fixing member, the base spot (internal structure) can be taken out, and repair and replacement of the base spot are extremely easy. Further, even in a design requiring a large seismic strength, the desired width can be easily achieved by controlling the vertical width of the stopper ring as necessary. Since the jack-up is only required to be several millimeters, for example, it is possible to significantly reduce repair and maintenance costs without interrupting or restricting traffic on a bridge, a highway, or the like.

[Brief description of the drawings]

FIG. 1 is a half cutaway view of a first embodiment of a fixed bearing according to the present invention.

FIG. 2 is a plan view of a lower stopper structure of the fixed bearing of FIG. 1;

FIG. 3 is a partial cutaway view showing a second embodiment of the fixed bearing of the present invention.

FIG. 4 is a half cutaway view of a third embodiment of the fixed bearing of the present invention.

FIG. 5 is a partial cutaway view showing a fourth embodiment of the fixed bearing of the present invention.

FIG. 6 is a partially cutaway view showing an embodiment of the moving bearing of the present invention.

FIG. 7 is a sectional view showing the structure of the center key of FIG. 6;

FIG. 8 is a view showing the structure of a conventional fixed bearing.

FIG. 9 is a view showing the structure of a conventional one-way movable bearing.

FIG. 10 is a sectional view showing another example of the structure of the fixed bearing.

[Description of Signs] 1 Fixed bearing 2 Upper anchor plate 3 Lower anchor plate 4 Base pot 5 Top plate 5 'groove 6 Elastic body 7 Seal ring 8 Piston 9 Moving bearing 10 Lubrication member 11 Sliding member 12 Center key 13 Upper anchor bolt Reference Signs List 14 lower anchor bolt 15 upper stopper ring 15 'flange of upper stopper ring 15 "flange of upper stopper ring 16 lower stopper ring 17 flange 18 disassembly bolt 19 fixing bolt 20 stopper plate 21 sliding member

Claims (8)

(57) [Claims] 1. A upper anchor plate that is fixed to the upper structure, the lower anchor plates fixed to the lower structure
And the upper anchor plate and the lower anchor plate
Between the elastic body and the fixed member arranged on the elastic body
And a baespot with
The baespot is fixed on the upper surface of the lower anchor plate.
There is a recess for fitting a fixing member
Is, and wearing the base pot, the wear detachably fixing member which is fitted to the recess, the upper surface of the lower anchor plate
A bearing that is fixed detachably . 2. The bearing according to claim 1, wherein the bearing is a fixed bearing, and an upper peripheral edge of the piston is removably fitted in a recess on a lower surface of the upper anchor plate. 3. The bearing is a fixed bearing, the lower surface of the upper anchor plate has substantially no recess for fitting the piston, and the piston is disposed on the lower surface of the upper anchor plate. The detachable fixing member is detachably fixed so that the upper surface of the piston abuts the lower surface of the upper anchor plate.
The bearing according to claim 1. 4. The bearing according to claim 1, wherein said bearing is a movable bearing, and further comprises a top plate detachably fixed to a concave portion on a lower surface of said upper anchor plate, wherein a lower surface of said top plate abuts on an upper surface of said piston. Bearing according to item 1. 5. The bearing is a movable bearing, wherein the lower surface of the upper anchor plate has substantially no recess for fitting a top plate, and the top plate is disposed on the lower surface of the upper anchor plate. The bearing according to claim 1, wherein a detachable fixing member provided is detachably fixed to a lower surface of the upper anchor plate such that a lower surface of the top plate is in contact with an upper surface of the piston. 6. The bearing according to claim 4, wherein a lubricating member is provided on a lower surface of the top plate and / or an upper surface of the piston. 7. flange portion is provided on the outside portion of the fixing member, the the collar portion removably screw is provided, bearing according to any one of claims claims 1 to 6. Wherein said bearing is a one-way mobile bearing,
Bearing according to the preceding claims 4 to 7 have Zureka.