JP2001330186A - Joint for base-isolated piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb the horizontal relative displacement of piping on the base- isolated building side and a non-base-isolated foundation part or piping at the non-base-isolated foundation part, to have no restrictions on distance from a fire limit through-wall and further to simplify constitution. SOLUTION: This joint for base-isolated piping is provided with flange parts 11, 12 provided at upper and lower end parts and respectively connectable to upper and lower piping vertically provided at a base-isolated building and a non-base-isolated foundation part, and a displacement absorbing pipe 10 made of metal, integrally provided between the upper and lower flange parts 11, 12, and expansive and flexible by bellows parts, 14, 15 to absorb the horizontal relative displacement of the upper piping and lower piping. An inner pipe 13 having a smooth inner side face and capable of absorbing the horizontal relative displacement of the upper piping and lower piping together with the displacement absorbing pipe 10 is provided inside the displacement absorbing pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation pipe used for connecting vertically provided piping from a seismically isolated building to a non-seismic base part for drainage, water supply, hot water supply, etc. For joints.

[0002]

2. Description of the Related Art Since a base-isolated building and a non-seismic base are simultaneously displaced in the vertical direction when an earthquake occurs, there is no relative displacement in the vertical direction, and it is considered that a firm load support is possible in the vertical direction. ing. On the other hand, in the horizontal direction, a relative displacement occurs between the base-isolated building and the non-base-isolated foundation.
Therefore, for example, if the drainage pipes provided vertically from the base-isolated building are directly connected to the pipes of the non-base-isolated foundation part of the drainage office such as a sewage tank, the base-isolated building side and the base-isolated base will be connected when an earthquake occurs. There is a risk that the pipe will be damaged by the horizontal relative displacement with the base part side, and to prevent such damage, it is necessary to insert a seismic isolation pipe joint in the middle.

Conventionally, as an example of this type of joint for a seismic isolation pipe, there is an expansion joint part which is arranged in a horizontal line at right angles to a vertical pipe on a seismic isolation building side and a pipe on a non-seismic base part side. One side is connected to each other, the other side of both expansion joints is connected by a curved tube, and each expansion joint is a bellows-like tubular body having elasticity and flexibility made of metal such as stainless steel inside, There has been known a configuration including an outer metal mesh such as stainless steel and a mesh-like cylindrical body (blade) having elasticity and flexibility.

As another example of a joint for seismic isolation pipes, connecting portions provided at both ends of a rubber cylinder are connected to a vertical pipe on a seismic isolation building side and a vertical pipe on a non-seismic base part side. A known configuration is known.

[0005]

However, among the above-mentioned conventional examples, the former configuration requires a large number of components, a complicated support structure, and is expensive. In addition, since a large installation area is required, the installation location is restricted. On the other hand, in the latter configuration, since the configuration is a single vertical type, a large installation area is not required in terms of the configuration, but it is weak to heat.
m or more,
It is necessary to lengthen the ceiling and the floor, and it is difficult to configure a compact piping system, and there are restrictions on locations. In order to solve these problems, it is also possible to form a vertical single seismic isolation pipe joint using the bellows-like tubular body used in the conventional example and a mesh-like tubular body enclosing the outside thereof. Although it is conceivable, in such a configuration, since the elongation is small, it is necessary to loosen and attach the flexible hose and compensate for the insufficient elongation by the slack. In this case, it is difficult to make up for the amount corresponding to the elongation due to the large horizontal displacement with the slack, and it is impossible to absorb the large displacement, so that it cannot be used.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. A pipe vertically descending from a base-isolated building is connected to a non-base-isolated base part or a pipe of the non-base-isolated part. Can be connected to the seismic isolation building-side piping and the non-seismic base part or the non-seismic base part piping generated in the event of an earthquake in the horizontal direction. And the distance from the penetration wall of the fire protection compartment is not restricted, and the configuration can be simplified. Therefore, it can be freely mounted even in a narrow space, and the location is restricted. It is an object of the present invention to provide a seismic isolation pipe joint that can be prevented from being subjected to the vibration and can reduce the cost.

[0007]

In order to solve the above problems, a seismic isolation pipe joint according to the present invention is provided at upper and lower ends,
Connections that can be connected to the pipes provided in the vertical direction of the base-isolated building and the non-seismic base section, or the pipes provided in the non-base-isolated base section, respectively, and between the upper and lower connection sections A metal that is provided and has elasticity and flexibility due to a bellows-like portion, and can absorb horizontal relative displacement between the pipe on the seismic isolation building side and the non-seismic base part or the pipe of this non-seismic base part. It is provided with a displacement absorption tube made of.

According to another aspect of the present invention, there is provided a joint for seismic isolation piping according to the present invention, wherein the inner surface is smooth inside the metal displacement absorption pipe and the displacement absorption pipe is provided on the seismic isolation building side. It is provided with an inner pipe capable of absorbing a horizontal relative displacement between the pipe and the non-seismic base part or the pipe of the non-seismic base part.

In each of the above structures, it is preferable that the metal displacement absorbing tube has a bellows-like portion on the upper and lower connecting portions and a straight tubular portion in the middle portion. In this case, the bellows-like portion of the displacement absorbing tube is provided. Is preferably set so that the height of the hill gradually decreases from the middle portion side of the displacement absorption tube to the connection portion side.

According to the present invention configured as described above,
Connecting a displacement absorption pipe with elasticity and flexibility by means of a bellows-like part to pipes provided vertically in a seismically isolated building and a non-seismic base part, or pipes provided in this non-seismic base part When the earthquake occurs, the horizontal relative displacement between the pipe on the seismically isolated building side and the non-seismic base part or the pipe of this non-seismic base part can be absorbed by the displacement absorption pipe. And since the displacement absorption pipe is made of metal, it is possible to avoid restrictions on the arrangement distance from the building wall, and furthermore, the upper and lower connecting portions of the displacement absorption pipe are not connected to the piping on the seismic isolation building side. Since it is only connected to the seismic isolation base part or the pipe of the non-seismic base part, the configuration can be simplified.

Further, the inner surface of the metal displacement absorbing tube is smooth, and the displacement absorbing tube and the piping on the seismically isolated building side and the non-seismic base portion or the piping of the non-seismic base portion together with the displacement absorbing tube are horizontal. By having an inner tube that can absorb relative displacement,
In the case where the pipe is for drainage, it is possible to prevent solids and the like from being caught and clogged even when solids and dirt mixed with the solids flow.

In addition, the metal displacement absorbing tube can be stably displaced by providing bellows-like portions on the upper and lower connecting portions that are mainly displaced, and by providing a straight tubular portion on an intermediate portion that is hardly displaced. it can.

Further, by setting the height of the peak to gradually decrease as the bellows-like portion moves from the middle portion side to the connection portion side, the rigidity is increased at the connection portion side where the stress increases upon displacement. This makes it possible to reduce the displacement burden, and to move the displacement to other peaks on the intermediate portion side.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described. 1 to 3 show a joint for a seismic isolation pipe according to a first embodiment of the present invention. FIG. 1 is a partially cutaway front view, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. FIG.

In this embodiment, an example in which the present invention is applied to a drainage pipe is shown. 1 to 3, reference numeral 1 denotes an upper drainage pipe, reference numeral 2 denotes a lower drainage pipe, and reference numeral 3 denotes a seismic isolation pipe joint of the present embodiment. For example, the upper drainage pipe 1 is connected in a vertical direction in a sealed state on each floor of a base-isolated building (not shown) of a base-isolated building, and is a horizontal branch pipe (Drain from a sanitary device such as a toilet on each floor). (Not shown) are connected in a sealed state. The uppermost end of the drainage pipe 1 is open to the atmosphere, and a flange portion 4 as a connection portion is integrally provided around the lower end portion. A bolt insertion hole 5 is formed at a plurality of outer peripheral portions of the flange portion 4. . The lower drainage pipe 2 is located below the upper drainage pipe 1, is disposed vertically, and is connected to a drainage office 6 that is a non-seismic base part. A flange portion 7 as a connection portion is integrally provided around an upper end portion of the drainage pipe 2, and a bolt insertion hole 8 is formed at a plurality of outer peripheral portions of the flange portion 7.

The joint 3 for a seismic isolation pipe according to the present embodiment comprises a flange portion 11 which is a connection portion at upper and lower ends of a displacement absorption tube 10.
12 are provided integrally, and an inner tube 13 is provided inside the displacement absorbing tube 10. The displacement absorption tube 10 has bellows 14 and 15 on the upper and lower flanges 11 and 12.
A straight tubular portion 16 having an inner surface and an outer surface
have.

More specifically, the bellows-like portion 1
Reference numerals 4 and 15 are made of a corrosion-resistant metal such as stainless steel or Inconel. One end of each of the short tubes 17 and 18 made of the same corrosion-resistant metal as described above is inserted inside one end of each of the bellows 14 and 15. Both are connected in a sealed state by welding or the like. Each end of a straight tubular portion 16 made of the same corrosion-resistant metal as described above is inserted inside the other end of each of the bellows-like portions 14, 15, and both are connected in a sealed state by welding or the like. The short pipe 17 is formed at the center of the flange 11,
The short tube 17 is loosely inserted into the hole 20 having a diameter slightly larger than the outer diameter of the short tube 17, and the flange portion 21 integrally provided at the upper end of the short tube 17 is engaged with the upper surface of the flange portion 11. Accordingly, both are fixed by welding or the like. The short pipe 18 is formed at the center of the flange portion 12, is inserted through a hole 22 having a slightly larger diameter than the outer diameter of the short pipe 18 in a loose state, and is provided integrally with a lower end of the short pipe 18. The portion 23 is engaged with the lower surface of the flange portion 12, and both are fixed by welding or the like as necessary. Bolt insertion holes 24 and 25 are formed in the outer peripheral portions of the flange portions 11 and 12 so as to correspond to the bolt insertion holes 5 and 8 in the flange portions 4 and 7 of the drainage pipes 1 and 2. Therefore, the displacement absorption tube 10 has elasticity and flexibility due to the upper and lower bellows-like portions 14 and 15.

The inner tube 13 is made of a material having elasticity and flexibility such as synthetic rubber or plastic, is a straight tube having a smooth inner surface, and has an outer diameter slightly smaller than the inner diameter of the short tubes 17 and 18. And flange portions 2 on both upper and lower ends.
6, 27 are provided integrally. The inner tube 13 is inserted into the inside of the displacement absorption tube 10, and each flange portion 26, 27 is connected to the flange portion 2 of the short tubes 17, 18 in the displacement absorption tube 10.
1 and 23 are engaged with the outer surfaces thereof, and both are fixed by adhesive or the like as necessary.

In the above configuration, the point of use will be described below. The joint 3 for the seismic isolation pipe of the present embodiment is inserted between the upper drain pipe 1 and the lower drain pipe 2.
Then, in a state where the flange portions 21 and 26 are interposed between the flange portion 4 and the flange portion 11, the two flange portions 4 and 1 are provided.
1 is connected in a sealed state by bolts 28 and nuts 29 using the bolt insertion holes 5 and 24 and the flange 26 as a sealing material. On the other hand, in a state where the flange portions 23 and 27 are interposed between the flange portion 7 and the flange portion 12, the two flange portions 7 and 12 use the bolt insertion holes 8 and 25, and the flange portion 27 is used as a sealing material and the bolt 30 is used. , And the nut 31 is connected in a sealed state. Thereby, drainage pipe 1,
The seismic isolation pipe joint 3 and the drainage pipe 2 can be connected so that drainage from various sanitary appliances can be discharged to the drainage chamber 6. At this time, the inner pipe 13 having the smooth inner surface and eliminating the fluid resistance as described above is attached to the joint 3 for the seismic isolation pipe.
Therefore, even if solid matter such as paper is contained in the drainage, there is no danger that these solid matter will stagnate or be caught, and the drainage line 6 will be smoothly placed without blocking the pipeline. Can be discharged.

When the internal pressure acts on the seismic isolation pipe joint 3, an internal pressure thrust is generated in the effective sectional area of the bellows-like portions 14, 15, and the load is considered to act on the fixed points at both ends. However, as described above, when an earthquake occurs, the base-isolated building and the non-base-isolated base are simultaneously displaced in the vertical direction, so that no vertical relative displacement occurs, and the base-isolated building and the non-base-isolated base are not connected. Because it is possible to fix the vertical load,
There is no need to restrain the internal pressure thrust on the seismic isolation pipe joint 3 itself.

When an earthquake occurs, even if the non-seismic base part, that is, the lower drainage pipe 2 side is displaced in any horizontal biaxial direction with respect to the seismic isolation building, that is, the upper drainage pipe 1, Since the joint 3 for seismic isolation piping connecting between them has elasticity and flexibility by the bellows-like parts 14 and 15, as shown in FIG. 3, the bellows-like parts 14 and 15 extend in the axial direction and have an angle. By displacing, it becomes possible to absorb as a range perpendicular to the axis. Therefore, it is possible to prevent the drainage pipes 1 and 2 from being damaged.

Next, a second embodiment of the present invention will be described. FIG. 4 is a partially cutaway front view showing a joint for a seismic isolation pipe according to a second embodiment of the present invention.

In the present embodiment, as shown in FIG. 4, the lower end (downstream side) of the inner tube 13 is free from the flange 27, that is, without being fixed to the displacement absorbing tube 10. In order to cope with the horizontal relative displacement by moving along the axial direction, a ring-shaped sealing material 32 is interposed between the flange portion 22 and the flange portion 11 instead of the flange portion 27. Things,
Other configurations are the same as in the first embodiment.

Since the lower end of the inner pipe 13 is located downstream of the drainage without being fixed, there is no danger that solid matter will stagnate or get caught. Can be simplified.

Next, a third embodiment of the present invention will be described. FIG. 5 is a partially broken front view showing a joint for a seismic isolation pipe according to a third embodiment of the present invention.

In the present embodiment, as shown in FIG. 5, the upper and lower bellows-like portions 14 and 15 of the displacement absorbing tube 10 are connected to the flange portion 1 from the middle of the displacement absorbing tube 10 as connecting portions.
The height of the hills is set to gradually decrease toward the sides 1 and 12 (see FIGS. 1 and 3), and other configurations are the same as those of the first or second embodiment. (The inner tube 13 is omitted in the figure).

When the joint 3 for seismic isolation pipes absorbs the horizontal relative displacement, the bellows 14, 15 are displaced from the peaks on the intermediate side to the peaks on the flanges 11, 12, and the flanges 11, 12 are displaced. Since the moment acts most on the peak near the side, this portion may be repeatedly damaged by fatigue. Therefore, as described above, as the bellows-like portions 14 and 15 reach the flange portions 11 and 12 side, the displacement load is reduced by gradually lowering the rigidity so as to have rigidity, and the displacement is moved to the central mountain. The fatigue life is improved repeatedly, and the horizontal displacement can be absorbed by the compact length.

It should be noted that the inner tube 13 may be unnecessary depending on the application. Further, the displacement absorption tube 10 can be formed in a bellows shape over the entire length. In addition, the flange 12 at the lower end of the seismic isolation pipe joint 3 can be connected to the drainage chamber 6 or the like directly around the hole in a sealed state. In addition, the present invention can be variously changed in design without departing from the basic technical idea.

[0029]

As described above, according to the present invention, pipes and non-seismic foundations provided vertically in a seismic isolation building,
Alternatively, a bellows-like part is connected to the piping of the non-seismic base part by a bellows-like part to connect a displacement absorption pipe having elasticity and flexibility, and when an earthquake occurs, the piping on the seismic isolated building side and the non-seismic base part, or The horizontal relative displacement of the non-seismic base portion with the pipe can be absorbed by the displacement absorbing pipe. And
Since the displacement absorption pipe is made of metal, the distance from the wall of the building is not restricted, and the upper and lower connecting parts of the displacement absorption pipe are connected to the building-isolated building piping and non-seismic. Since it is only connected to the base part or the pipe of the non-seismic base part, the configuration can be simplified. Therefore, it can be freely mounted even in a narrow space, and can be free from locational restrictions, and cost can be reduced.

Further, the inside of the metal displacement absorbing pipe has a smooth inner surface and, together with the displacement absorbing pipe, the pipe on the seismically isolated building side and the non-seismic base part, or the horizontal pipe of the non-seismic base part. By having an inner tube that can absorb relative displacement,
In the case where the pipe is for drainage, it is possible to prevent solids and the like from being caught and clogged even when solids and dirt mixed with the solids flow. Therefore, it is possible to smoothly discharge filth and the like mixed with solids.

The metal displacement absorbing tube can be stably displaced by providing bellows-like portions on the upper and lower connecting portions that are mainly displaced, and by providing a straight tubular portion on an intermediate portion that is hardly displaced. it can. Therefore, the cost can be further reduced and the durability can be improved.

Also, by setting the height of the hill to gradually decrease as the bellows-like portion moves from the middle portion side to the connection portion side, the rigidity is increased at the connection portion side where the stress increases upon displacement. This makes it possible to reduce the displacement burden, and to move the displacement to other peaks on the intermediate portion side. Therefore,
The durability can be further improved.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a joint for a seismic isolation pipe according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 showing the seismic isolation pipe joint.

FIG. 3 is an explanatory view of a displacement operation in the seismic isolation pipe joint.

FIG. 4 is a partially cutaway front view showing a seismic isolation pipe joint according to a second embodiment of the present invention.

FIG. 5 is a partially broken front view showing a main part of a joint for a seismic isolation pipe according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper drainage pipe 2 Lower drainage pipe 3 Seismic isolation pipe joint 4 Flange part 7 Flange part 10 Displacement absorption pipe 11 Flange part 12 Flange part 13 Inner pipe 14 Bellows part 15 Bellows part 16 Straight pipe part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiro Iwabuchi 2-5-13 Sanno, Ota-ku, Tokyo Inside Tokyo Spiral Pipe Works Co., Ltd. (72) Inventor Takeshi Hasebe 2-5-113 Sanno, Ota-ku, Tokyo No. In the Tokyo Spiral Pipe Works, Ltd. (72) Inventor Shigeyuki Matsumoto 2-5-13, Sanno, Ota-ku, Tokyo F-term in Bencan 3H104 JA07 JA08 JB02 JC09 JD01 LB01 LB38 LF16 LG02 LG30 MA08

Claims (4)

[Claims] 1. A connection provided at upper and lower ends and connected to a pipe provided in a vertical direction in a base-isolated building and a non-base-isolated base part or a pipe provided in the base-isolated base part. Part and the upper and lower connecting parts are integrally provided, and have elasticity and flexibility by a bellows-like part, and the piping and the non-seismic base part of the seismic isolation building side or the non-seismic base A seismic isolation pipe joint comprising a metal displacement absorption pipe capable of absorbing horizontal relative displacement with a part of the pipe. 2. The displacement absorbing pipe made of metal has a smooth inner surface, and the displacement absorbing pipe and the pipe on the side of the base-isolated building and the non-seismic base or the pipe of the non-base-isolated base together with the displacement absorbing pipe. The joint for a seismic isolation pipe according to claim 1, further comprising an inner pipe capable of absorbing displacement. 3. The displacement absorbing tube made of metal has a bellows-like portion on upper and lower connecting portions, and a straight tubular portion on an intermediate portion.
Or the joint for seismic isolation piping described in 2. 4. The displacement absorption pipe according to claim 1, wherein the height of the peak is gradually reduced as the bellows-shaped part of the displacement absorption pipe extends from the middle part side to the connection part side of the displacement absorption pipe. Fittings for seismic isolation piping described in.