JP2000356295A - Base isolated piping system and bellows expansion pipe joint with leg part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolated piping system displaceably supported with simple structure and a smaller occupied area than a conventional one, and to provide a bellows expansion joint used for this system. SOLUTION: A base isolated piping system S presenting an L-shaped pipeline connects a piping 20 on the ground side and a piping 30 on the base isolated building side. Hinge type or gimbal type bellows expansion pipe joints 1, 2 are respectively provided at both ends of the L-shaped pipeline, and a bellows expansion pipe joints 3 with a leg part is provided near an L-shaped bent part of the L-shaped pipeline. The bellows expansion pipe joint 3 with the leg part has a structure part 4 of the hinge type or gimbal type bellows expansion pipe joint, and the leg part 5 for abutting on a support face 7. The leg part 5 is provided at its support face side end part with a contact means 6 for displacement with rolling friction or sliding friction on the support face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a seismic isolation pipe used for connection between a pipe laid on the ground and a pipe in a seismic isolation building (a building constructed on the ground via a seismic isolation device). The present invention relates to a technical field, and particularly to a piping structure using a bellows type expansion joint.

[0002]

2. Description of the Related Art A seismic isolation building is a building in which a seismic isolation device (laminated rubber type, mechanical type, or the like) is interposed between the ground and the building so that the shaking of the ground due to an earthquake is hardly transmitted to the building side. For example, it is a state where a building is built on a rubber foundation on the ground, so that even if the ground shakes due to an earthquake, the shaking is absorbed by the rubber foundation, making it difficult for the building to transmit the shaking Has become. The ground referred to here includes the reinforcement layer applied to the surface of the land as the foundation of the building,
It means the whole base that belongs to the earth's vibration system.

In a seismic isolation building, the above-mentioned seismic isolation device makes the building itself less susceptible to ground vibrations. For this reason, pipes such as water pipes and city gas pipes that enter the building from outside. With regard to the above, there is a problem in that a relative displacement occurs between a piping system on the ground side and a piping system on the seismic isolation building side (particularly, a connection portion of piping at a boundary between the ground and the building). This problem is the same even when equipment such as a tank or a refrigerator installed on the ground is connected to piping on the seismic isolation building side. Hereinafter, the relative displacement generated between the ground and the base-isolated building is also simply referred to as “relative displacement”.

[0004] In order to cope with the above problem, it is necessary to provide a structure for absorbing relative displacement at a connecting portion of piping at a boundary between the ground and the seismic isolation building. As a piping structure for absorbing the relative displacement, seismic isolation (or earthquake-resistant) piping is known.

A conventional seismic isolation pipe is disclosed in Japanese Unexamined Patent Publication No. 9-30.
There is a "seismic pipe" described in JP-B-3616 and similar ones. This seismic isolation pipe is made into an L-shape by connecting a metal flexible tube across a 90 ° elbow, and is used as a connection portion between the ground side pipe and the seismic isolation building side pipe. This seismic isolation pipe has two 90 ° elbows.
Although the relative displacement is absorbed by two metal flexible tubes, a longer flexible tube is required to absorb a larger displacement. Therefore, a flexible tube having a different length is required depending on the amount of displacement. In addition, since the behavior when absorbing relative displacement due to an earthquake cannot be specified, a large space for behavior is required around the surroundings. Does not completely return to the neutral position, and remains deformed as a bent state or an expanded state.

Instead of a metal flexible tube, a plurality of ball joints or a plurality of hinge-type / gimbal-type bellows-type telescopic joints are used to form an L-shaped pipe. There are also seismic isolation pipes that share the degree and absorb all three-dimensional relative displacement in the L-shaped part. Some of such seismic isolation pipes can return to the original neutral position when the relative displacement between the ground and the building is lost.

[0007]

However, each of the above seismic isolation pipes basically attempts to absorb relative displacements in a plurality of directions by making the pipes L-shaped. For this purpose, the L-shaped bent portion of the seismic isolation pipe must be supported so as to be displaceable with respect to the ground or the seismic isolation building. Conventionally, as a structure for this, a square stage base (substrate) is provided on the ground, a gantry with a roller is placed on the stage base, and the gantry can be displaced.
A structure that fixes the elbow, a structure that allows the 90 ° elbow to be displaced by suspending it from the seismic isolation building side with a spring, etc., one point at the elbow part, and two points near the midpoint of each of the two arms that sandwich the elbow A structure that supports a total of three points with a gantry is used.

However, the structure which is movable by using the above-mentioned pedestal with a roller is a large-scale device for receiving the entire bent portion of the L-shaped pipe, which occupies a large space and is expensive. In addition, the structure in which the elbow portion is suspended and movable as described above has a problem that not only complicating the behavior of the pipe, Since a useless load is applied to the actuator, it cannot be applied to a large displacement. Further, such a support structure as described above cannot cope with the displacement in the vertical direction, and it is not preferable in terms of the durability and the degree of freedom of the equipment that the pipe is displaced while rubbing on the three-point gantry.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic isolation piping system occupying a smaller area and having a simple structure and being displaceably supported, and a bellows type expansion joint for use in the system. To provide.

[0010]

SUMMARY OF THE INVENTION The present invention has the following features. (1) L connecting the ground side piping and the seismic isolation building side piping
A bellows type expansion joint of the following (A) is provided at both ends of the L-shaped pipe, and near the bent portion of the L-shaped pipe, A bellows type telescopic joint with a leg is provided, and the bellows type telescopic joint with a leg has the structure of the bellows type telescopic joint described in (A) below and is provided on either the ground side or the base-isolated building side. And a leg for contacting the support surface of the following (B) belonging to the vibration system of
A seismic isolation piping system comprising: a contact means for contacting the end of the support surface of (B) with a partial or sliding friction of the support surface of (B).

(A) The bellows type expansion joint has a structure in which both ends are connected to each other via a hinge, and the connection via the hinge suppresses expansion and contraction due to internal pressure thrust and is at least one plane. Bellows type expansion joint that can bend at the same time. (B) The supporting surface of the partner with which the bellows type expansion joint with legs comes into contact with rolling friction or sliding friction.

(2) The seismic isolation piping system according to (1), wherein the bellows type expansion joint of (A) is a hinge type bellows type expansion joint or a gimbal type bellows type expansion joint.

(3) The bellows type expansion joint of (A), wherein the L-shaped pipes are arranged in order from the ground side to the seismic isolation building side.
The pipe includes at least a straight pipe, a bent portion, the bellows-type telescopic joint with a leg, the straight pipe, and the bellows-type telescopic joint of (A) in the conduit, and the support surface of (B). Is a surface belonging to a ground-side vibration system.

(4) The bellows-type expansion joint of (A), wherein the L-shaped pipes are arranged in this order from the base-isolated building side to the ground side.
The pipe includes at least a straight pipe, a bent portion, the bellows-type telescopic joint with a leg, the straight pipe, and the bellows-type telescopic joint of (A) in the conduit, and the support surface of (B). Is the surface belonging to the vibration system on the side of the seismic isolation building.

(5) (A) used in the above and
(3) or (4), wherein the bellows-type telescopic joint is a hinged bellows-type telescopic joint, and the bellows-type telescopic joint with legs has a structure of a hinge-type bellows-type telescopic joint. Seismic isolation piping system.

(6) The bellows type telescopic joint of (A) used above is a hinge type bellows type telescopic joint, and the bellows type telescopic joint with legs is a gimbal type bellows type telescopic joint. (3) or (4), wherein the bellows type expansion joint of (A) used above is a gimbal type bellows type expansion joint.
The seismic isolation piping system described.

(7) The above and (A) used in
(3) or (4), wherein the bellows type expansion joint is a gimbal type bellows type expansion joint, and the bellows type expansion joint with leg has a gimbal type bellows type expansion joint. Seismic isolation piping system.

(8) The support surface of (B) is a surface belonging to the ground-side vibration system, and a base plate is further provided on the ground, and the upper surface of the base plate is placed on the support surface of (B). The seismic isolation piping system according to the above (1), wherein the contact means of the bellows type expansion joint with a leg is displaced while being in contact therewith.

(9) The support surface of (B) is a surface belonging to the vibration system on the side of the base-isolated building, and the base plate is provided so as to be suspended from the base-isolated building. The seismic isolation piping system according to the above (1), wherein the contacting means of the bellows type expansion joint with leg is displaced while being in contact with the supporting surface of the above (B).

(10) It has the structure of the bellows type expansion joint of the above (A) and has a leg for contacting the support surface of the above (B), and the leg is formed of the above (B) A bellows type expandable pipe joint with legs, characterized in that it has a contact means for contacting the support surface side end with a frictional or sliding friction of the support surface (B).

(11) The bellows type telescopic joint with leg according to the above (10), wherein the bellows type telescopic joint of (A) is a hinge type bellows type telescopic joint or a gimbal type bellows type telescopic joint. .

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION A seismic isolation piping system S of the present invention
As shown in an example in FIG.
This is a piping structure that connects the piping 30 on the seismic isolation building side.
As shown in the figure, the system S is a piping structure having an L-shape as a whole, and the bellows type expansion joints 1 and 2 of (A) are provided at both ends of the L-shaped pipe. (Hereinafter, the bellows type expansion joint of the above (A) is referred to as “the joint of the (A).” The joint of the (A) will be described later in detail.) These (A) pipe fittings 1, 2
Thereby, the system S is connected to the pipe 20 on the ground side and the pipe 30 on the seismic isolation building side. The example in the figure is
It is an example of arranging an L-shaped pipe in a horizontal plane,
The pipe joints 1 and 2 shown in FIG. 1A can bend at least in a horizontal plane, that is, the arrow m in FIG.
It is used so as to be able to bend in the direction of 1, m2, but the usage is not limited to this. Arrows m1 and m2 and arrow m3 described below show only one bending operation of each pipe joint, but the actual movement is a relative bending operation performed by one end with respect to the other end.

In the vicinity of the bent portion in the L-shaped pipe, the bellows-type telescopic joint 3 with a leg is so arranged as to be able to absorb at least the bending in the horizontal plane (ie, at least to bend in the direction of arrow m3). (To be able to do so). This bellows type expansion joint with leg is a pipe joint according to the present invention, and as shown in an example in FIG. (B) Support surface 7
And a leg 5 for supporting itself and the system. Hereinafter, this bellows type expansion joint with a leg is simply referred to as a “tube joint with a leg”, and the support surface of (B) is simply referred to as a “(B) surface”. The (B) plane will be described later. A contact means for moving the leg (5) of the pipe joint with a leg on the surface (B) while contacting the end on the side of the surface (B) with a partial friction or a sliding friction. 6. Thereby, the pipe joint 3 with a leg is configured to be able to smoothly displace on the (B) plane while supporting the entire L-shaped pipe.

With the above configuration, the relative displacement can be effectively absorbed. In particular, a pipe joint with a leg is an important part that becomes a unique structure of the present invention, and its leg is
While supporting the system movably in the center, it fits within the area occupied by the bellows-type expansion joint of the joint with legs. Therefore, despite the simple structure and the compact supporting structure that does not occupy space, the bent part of the L-shaped pipe is supported so as to be displaceable with respect to the ground or the base-isolated building, and the entire system effectively reduces relative displacement. It is possible to absorb it.

Also, three bellows type expansion joints 1 to 3
By using the configuration, the magnitude of the displacement can be determined by the length of the interval between the pipe joints 1 to 3, for example, compared with the conventional system using a metal flexible tube, the displacement load is extremely small Has become. This is because when the system absorbs the displacement, a force is generated to return to the state before the displacement in the direction opposite to the displacement, but unlike the case of the metal flexible tube, the fitting of (A) is formed by the outer circumference of the bellows. This is because there is no braided blade that becomes a resistance when displaced, and the straight pipe section connecting the pipe joints corresponds to the "puddle" of the principle of leverage, and performs angular displacement with a small force.

The pipe joint (A) has a structure in which the pipe joints are connected to each other through a hinge portion.
Unlike a mere bellows type expansion joint, it is possible to perform a bending operation on one or more planes while suppressing expansion and contraction of the bellows due to internal pressure thrust. Typical examples of the pipe joint of (A) include a pipe joint called a hinge type bellows type expansion joint and a gimbal type bellows type expansion joint. In particular, JIS B0151 has the number 420
A hinged bellows type expansion joint specified as 8 and a gimbal type bellows type expansion joint specified as 4207 are preferable as standard products. The hinge type bellows type expansion joint can bend in one plane, and the gimbal type bellows type expansion joint can bend in any plane. In addition, the pipe joint of (A) is not only the standard product as described above, but also the one in which the dimensions and materials of each part are out of the standard, and in which each part of the hinge part and the gimbal is improved. May be basically used as long as it has a structure basically equivalent to the pipe joint of (A).

The L-shaped pipes may be arranged not only in a horizontal plane but also in various planes such as a vertical plane according to the current state of the piping of the seismic isolation building. When arranging the L-shaped pipe in a horizontal plane as in the above example,
The pipe joint of (A) and the pipe joint with legs are connected so as to bend at least in a horizontal plane. this is,
In the case where the structure of the pipe joint of (A) is particularly a hinge type, the bending operation is limited to one plane. Therefore, when the L-shaped pipe is arranged in the horizontal plane, the bending operation in the horizontal plane is restricted. This means that the installation direction is selected and used so that it can be performed. Hereinafter, the system will be described according to an embodiment in which the L-shaped pipe is arranged in a horizontal plane.

The legged pipe joint is a unique pipe joint member according to the present invention for use in supporting the system or general piping, and as shown in FIGS. 1B and 2, (A) And a leg 5 which constitutes the structure of the pipe joint. Contact means 6 is provided at the tip of the leg 5. The structure of the portion 4 is as described above for the pipe joint (A).

The legs need only have a length and strength capable of supporting the system with respect to the surface (B), and the outer shape, structure, material, number and the like may be freely selected. The (B) plane is not always below the legged pipe joint. Therefore, the required number of legs may be provided so as to extend from the portion 4 in the required direction. For example, a mode in which the system is supported in a suspended state with respect to the upper (B) plane, or a mode in which each of two opposing vertical planes facing each other and sandwiching the pipe joint with legs may be used. .

As shown in FIG. 1B and FIG. 2, the outer shape of the leg portion has a simple shape that linearly extends from the portion 4 constituting the pipe joint structure of FIG. Although it is preferable, it may be freely designed according to the circumstances of the installation site. The leg structure is preferably simply a structure using a solid or hollow columnar material, or a structure combining flat steel and shaped steel, etc., but is not limited thereto. It is also possible to adopt a structure in which the entire length of the leg is adjustable or a structure including a suspension. Examples of the material of the leg portion include a steel material used for a general structure, stainless steel, and a high-strength resin material. In the example shown in FIG. 1B and FIG. 2, the flat steel is combined by welding so as to have a T-shaped cross section, so that the structure is inexpensive, light, and strong.

The contact means may be any as long as it can contact the surface (B) with rolling friction or sliding friction. For rolling friction, for example,
A structure in which rolling members such as wheels, rollers, and spheres are attached to the leg body. Further, as a special mode, even in a structure in which a rolling member such as a roller conveyor is laid on the (B) surface side, the rolling member is regarded as a contact means belonging to the leg.

For sliding friction, there is a structure in which the tip of the leg has a smooth contact surface having a curved surface such as a hemisphere, and a sliding member having such a structure is used as a sliding member. The structure attached to the main body is mentioned. The combination of the material of the sliding member and the material of the base plate described later may be appropriately selected in consideration of the ease of sliding.

The number of legs and the number of rolling members and sliding members of one leg are not limited. However, since one leg behaves freely to absorb a relative displacement, one leg has one rolling member. Is preferred.

(A) The connection between the portion forming the structure of the pipe joint and the leg, and the connection between the body of the leg and the contact means may be a detachable connection structure such as bolting or screwing.
An integrated connection structure such as welding may be used. In terms of compactness during transportation, a connection method using bolts, which can be assembled on site, is preferable. In terms of reducing the number of parts and making the structure simpler, an integrated connection structure such as welding is preferable.

As shown in FIG. 1B, the leg portion 5 is fixed to one of the two end portions 4a and 4b of the portion 4 (the end portion 4a in FIG. 1), and the other end of the portion 4 is The portion (the end 4b in the figure) can freely bend with respect to the leg 5.
When this joint with a leg is used in the system, particularly when the structure of the joint of FIG.
As shown in (b), the end 4a to which the leg 5 is fixed
However, it is recommended that the connection be made on the side of the bend.
With this connection, even if the system receives a relative displacement perpendicular to the (B) plane from the base-isolated building side or the ground side, it is possible that the legs standing on the (B) plane will not hinder the behavior. In addition, the end 4b side can freely be axially displaced also in a direction perpendicular to the (B) plane, and can preferably absorb the relative displacement.

The pipe joint with legs is provided in the vicinity of the bent portion. (A) The arrangement pattern in which the pipe joint with legs is provided on the seismic isolation building side with respect to the bent portion (the example in FIG. 1); B) There is an arrangement pattern in which a pipe joint with a leg is provided on the ground side with respect to the bent portion. In terms of absorbing the relative displacements other than the axial direction by a pair of the pipe joint with the leg and the pipe joint of (A) with the straight pipe interposed therebetween, the pipe joint with the leg stands ( The surface B) should belong to the vibration system on the opposite side to the vibration system (the base-isolated building side or the ground side) to which the pipe joint of the other party (A) is connected. For example,
In the above arrangement pattern (a), as shown in FIG. 1, since the pipe joint 2 of the other party (A) is connected to the seismic isolation building side, the (B) surface on which the pipe joint 3 with legs stands is , A surface belonging to the vibration system on the ground side. Conversely, in the arrangement pattern (b), the (B) plane is a plane belonging to the vibration system of the base-isolated building.

(B) The plane belongs to the vibration system on the ground side.
Specifically, this means that the (B) surface is a surface of the ground itself, a ground surface layer member (a base plate or the like described below) dedicated to a system that vibrates integrally with the ground, an upper surface of a mount, or the like. on the other hand,
(B) means that the plane belongs to the vibration system on the seismic isolation building side.
The surface of the member that protrudes from the base-isolated building, the wall surface of the base-isolated building, the member suspended from the base-isolated building (base plate, etc.)
And the like. (B) The surface may be any of a flat surface, a curved surface, a concave surface, and a convex surface.
Further, from the viewpoint of workability and occupation area, the surface (B) belongs to the vibration system on the ground side, that is, the arrangement pattern (A) is more preferable.

In the case of the above arrangement pattern (a), FIG.
As shown in (b), it is preferable that a base plate 7a is provided as a plate member dedicated to the system on the ground and the upper surface thereof is the (B) surface 7 so that the contact means can move smoothly. The base plate may have any shape as long as it has a flat surface, does not deform or break even when receiving a load from the contact means, and covers an area where the contact means moves. The base plate may be one in which the surface layer of the ground is hardened, but a mode in which a steel plate, a high-strength resin plate, or the like is fixed on the ground is preferable.

In the case of the above arrangement pattern (a),
The basic configuration of the system is, as shown in FIG. 1, in order from the pipe 20 on the ground side to the pipe 30 on the seismic isolation building side.
(A) The pipe joint 1, the straight pipe P1, the bent part P2, the pipe joint with leg 3, the straight pipe P3, and the pipe joint 2 of (A) are connected. For the pipe joint of (A), any of the hinge type and the gimbal type may be used in any combination. The (B) plane is a plane belonging to the ground-side vibration system as described above. For connection of the piping elements (1) to (3), a pipe flange, screwing, a welded joint or the like is used as appropriate. Other piping elements may be inserted between these piping elements as needed.

On the other hand, in the case of the above arrangement pattern (b), the basic configuration is opposite to that of FIG. Are connected. The (B) plane is a plane belonging to the vibration system on the seismic isolation building side as described above. less than,
The basic configuration of the system will be described by taking the case of the above arrangement pattern (a) as an example.

The pipe joint (A) includes the hinge type and the gimbal type as described above. In the basic configuration of the system, a hinge type or a gimbal type may be freely selected for the structure of the pipe joint (A) included in the system according to the desired behavior. Among the combinations, the combinations described in (5) to (7) above are typical and preferable examples of the configuration of a horizontally arranged system.

The combination described in (5) above is
And (A) are all hinged. In this configuration, the system can absorb only the relative displacement in one plane, and is a preferable system for a seismic isolation pipe of a seismic isolation building in which only a relative displacement occurs in a horizontal plane, for example.

In the combination described in (6) above, the structure of the pipe joint of (A) is a hinge type, and the structure of the pipe joint of (A) is a gimbal type. FIG. 1A shows the combination. In this configuration, in addition to the behavior of the above (4),
The gimbal type pipe joint structure also bends in the vertical direction (perpendicular to the paper surface) and absorbs the relative displacement in the vertical direction as a pair, so the entire system absorbs the three-dimensional relative displacement. Can be done.

The combination described in (7) above is
(A) is a combination in which the structure of the pipe joint of (A) is a gimbal type (in FIG. 1, the pipe joint 1 of (A) is replaced with a gimbal type). In this configuration, for example, in the example of FIG. 1, when the height of the ground-side pipe 20 is different from the height of the straight pipe P3 of the system,
(A) The pipe joint 1 is bent in the vertical plane, and the angle caused by the difference in height between the two can be absorbed. That is,
Because the straight pipe P1 is inclined due to the difference in height between the two, the flange f1 of the bent portion P2 is displaced in the rotational direction with respect to the flange 4a of the pipe joint with the leg. By using the flange, the deviation in the rotation direction can be easily corrected, and the two bolt holes can be matched.

The seismic isolation piping system of the present invention can calculate the behavior of each part, and can calculate how much space for behavior is required in the surroundings at the design stage. FIG.
Strictly speaking, the behavior of the pipe joint with legs in the example of (a) draws an arc-shaped trajectory centered on the pipe joint 1, but the axis of the pipe joint 1 with respect to the length of the straight pipe P1. Since the bending angle is small, it may be regarded as close to a linear motion along the y direction shown in FIG. Therefore, the shape of the base plate 7a may be a narrow band which is long in the y-direction and short in the x-direction, and this indicates that the support structure is compact.

The bent portion has only to have an L-shaped bent channel. For example, it may be a standard product such as an elbow or a bend or a specially manufactured one. L in the present invention
The character shape includes not only a bent internal angle of 90 degrees, but also an obtuse internal angle such as a so-called 45-degree bend, and an acute internal angle of the opposite. A preferable internal angle of the bend in practical use is about 60 to 120 degrees, and 90 degrees is the most preferable internal angle of the bend in that the displacement can be easily absorbed in an arbitrary displacement direction.

The size and application of the piping to be used in the seismic isolation piping system of the present invention are not limited, and the piping for passing various fluids such as gas, air, water, and refrigerant, and the passage of electric wires and the like are provided. Piping. In practical use, the inner diameter of a pipe to be mainly used is about 50 mm to 300 mm. The relative displacement generated by the seismic isolation device of a normal seismic isolation building is ± 3 from the original position in one direction in the plane direction.
In many cases, the displacement from the original position to one side in the vertical direction is about 10 mm to 50 mm. What is necessary is just to adjust the length of a straight pipe so that these may be absorbed.

[0048]

EXAMPLE In this example, the seismic isolation piping system shown in FIG. 1 was actually manufactured, piping was performed on a model that partially reproduced the seismic isolation building, and behavior was observed by giving a pseudo relative displacement. The specifications of each part are as follows.

Pipe joint 1: hinge type bellows type expansion / contraction pipe joint, JIS B0151, No. 4208, nominal diameter 15
0A. Straight pipe P1: steel pipe, nominal diameter 150A, length 2378m
m. Bent part P2: 90-degree elbow, nominal diameter 150A. Structure of the pipe joint part of the pipe joint 3 with legs: (Gimbal type bellows type telescopic joint, JIS B0151, No. 4
207, nominal diameter 150A). The height from the base plate surface to the central axis of the pipe joint is 416 mm. Contact means: wheels with an outer diameter of 65 mm. Straight pipe P3: steel pipe, nominal diameter 150A, length 2000m
m. Fitting 2: Gimbal type bellows type expansion joint, JIS
B 0151, number 4207, nominal diameter 150A.

The relative displacement in the y direction that can be absorbed (≒ stroke in the y direction of the pipe joint 3 with legs) is 500 mm. Absorbable relative displacement in the x direction of 500 mm. Absorbable vertical relative displacement of 100 mm or more. Base plate: Material SS400, thickness 6 mm, y direction 185
7 mm x 673 mm in x direction.

With respect to the seismic isolation piping system having the above specifications, a test was conducted in which the ground side was stationary and the building side was displaced, and a test in which the building side was stationary and the ground side was displaced.
In each case, the displacement was absorbed by the seismic isolation piping system. The behavior of each part was as calculated, and the legged fitting moved smoothly without departing from the elongated base plate. When the applied displacement was reduced to 0, the seismic isolation piping system returned to its original shape.

[0052]

As described above, the seismic isolation piping system of the present invention achieves movable support for the vibration system on the ground side or the seismic isolation building side using the unique pipe joint with legs according to the present invention. I have. With this configuration, the structure for movably supporting the bent portion is simpler and more compact than before. The trajectory drawn by the contact means of the pipe joint with the leg has the same stroke amount in the axial direction (y direction in FIG. 1) as that of the conventionally known seismic isolation pipe, but in the direction perpendicular to the axial direction (in FIG. 1). (x direction), the width is extremely narrow. That is, a long stroke is performed while staying within the extremely narrow band-like region, and the area occupied by the pipe joint with the legs for movement is small.

Further, the seismic isolation piping system of the present invention can cope with various relative displacement amounts by changing the length of the straight pipe portion, so that it is possible to cope with many specifications with a small number of types.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a seismic isolation piping system of the present invention. FIG. 1A is an overall view when viewed from above.
In the figure, the paper surface is a horizontal plane, and among the relative displacements in the three-dimensional direction, the relative displacement in the horizontal plane is indicated by arrows x and y as the displacement on the building side. In order to indicate the center of rotation, the center of the pipeline, etc., the center line is added by a dashed line. In order to clearly show the system, the base plate 7
a, the pipe 20 on the ground side and the pipe 30 on the seismic isolation building side are drawn by two-dot chain lines. FIG. 1B is a side view of only a portion of the pipe joint with legs.

FIG. 2 is a perspective view showing an example of a pipe joint with legs according to the present invention. FIG. 1 shows a state where the pipe is connected to another pipe by a pipe flange.

[Explanation of symbols]

 S Seismic isolation piping system 1 Pipe joint of (A) 2 Pipe joint of (A) 3 Pipe joint with leg 4 Portion of pipe joint structure of (A) 5 Leg 6 Contact means 7 (B) surface 7a base Plate 20 Ground-side piping 30 Seismic isolation building-side piping

Claims (11)

[Claims] 1. An L-shaped conduit for connecting a pipe on the ground side and a pipe on the seismic isolation building side, and at both ends of the L-shaped pipe,
Each is provided with a bellows type expansion joint of the following (A),
A bellows-type telescopic joint with a leg is provided in the vicinity of the bent portion of the L-shaped conduit, and the bellows-type telescopic joint with a leg has a structure of a bellows-type telescopic joint of the following (A). And a leg for contacting a supporting surface of the following (B) belonging to a vibration system on either the ground side or the base-isolated building side, and the leg is provided on the supporting surface side of the (B). A seismic isolation piping system characterized by having a contact means for contacting the end surface with the frictional or sliding friction of the support surface of (B). (A) The bellows-type telescopic joint has a structure in which both ends are connected to each other via a hinge, and expansion and contraction due to internal pressure thrust is suppressed by the connection via the hinge;
Bellows type expansion joint that enables bending operation on a flat surface. (B) The supporting surface of the partner with which the bellows type expansion joint with legs comes into contact with rolling friction or sliding friction. 2. The bellows type expansion joint according to (A),
The seismic isolation piping system according to claim 1, which is a hinge type bellows type expansion joint or a gimbal type bellows expansion joint. 3. The bellows type telescopic joint, the straight pipe, the bent portion, and the bellows type telescopic joint with the leg of the above (A), wherein the L-shaped pipe is arranged in order from the ground side to the seismic isolation building side.
2. The support according to claim 1, wherein at least the straight pipe and the bellows type expansion joint of (A) are included in the pipe, and the support surface of (B) is a surface belonging to a ground-side vibration system. 3. Seismic isolation piping system. 4. The bellows-type telescopic joint of (A), the straight pipe, the bent portion, and the bellows-type telescopic joint with a leg in order of the L-shaped pipe from the base-isolated building side to the ground side.
The straight pipe and the bellows type expansion joint of (A) are included at least in the pipeline, and the support surface of (B) is a surface belonging to a vibration system on the seismic isolation building side. The seismic isolation piping system described. 5. The bellows type telescopic joint of (A) used in the above and (A) is a hinge type bellows type telescopic joint, and the bellows type telescopic joint with a leg part is a hinge type bellows type telescopic joint. Claim 3
Or the seismic isolation piping system described in 4. 6. The bellows type telescopic joint of (A) used above is a hinge type bellows type telescopic joint, and the bellows type telescopic joint with legs has a gimbal type bellows type telescopic joint. The seismic isolation piping system according to claim 3 or 4, wherein the bellows type expansion joint of (A) used above is a gimbal type bellows expansion joint. 7. The bellows type telescopic joint of (A) used in the above and (a) is a gimbal type bellows type telescopic joint, and the bellows type telescopic joint with a leg is a gimbal type bellows type telescopic joint. The seismic isolation piping system according to claim 3 or 4, wherein the seismic isolation piping system has: 8. The support surface of (B) is a surface belonging to a vibration system on the ground side, and a base plate is further provided on the ground, and an upper surface of the base plate is used as the support surface of (B). 2. The seismic isolation piping system according to claim 1, wherein the contact means of the bellows type expansion joint with leg is displaced while being in contact therewith. 9. The support surface of (B) is a surface belonging to the vibration system on the side of the base-isolated building, and further provided with a base plate suspended from the base-isolated building. 2. The seismic isolation piping system according to claim 1, wherein the support surface of (B) is configured to be displaced while the contact means of the bellows type expansion joint with leg is in contact with the support surface. 3. 10. A bellows type expansion joint according to the following (A), and a leg for contacting a supporting surface according to the following (B), wherein the leg supports the (B). A bellows type expandable pipe joint with legs, characterized in that it has a contact means for contacting the supporting end of the surface (B) with partial friction or sliding friction at the end on the surface side. (A) The bellows-type telescopic joint has a structure in which both ends are connected to each other via a hinge, and expansion and contraction due to internal pressure thrust is suppressed by the connection via the hinge;
Bellows type expansion joint that enables bending operation on a flat surface. (B) The supporting surface of the partner with which the bellows type expansion joint with legs comes into contact with rolling friction or sliding friction. 11. The bellows type telescopic joint with leg according to claim 10, wherein the bellows type telescopic joint of (A) is a hinge type bellows type telescopic joint or a gimbal type bellows type telescopic joint.