JP4035357B2 - Seismic isolation duct and seismic isolation duct mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation duct and its mounting structure.
[0002]
[Prior art]
A seismic isolation duct having a flexible duct body may be interposed between the first and second duct-attached pipes so that the piping path is not destroyed in the event of an earthquake or the like.
[0003]
For example, in Japanese Patent Laid-Open No. 11-132365, an L-shaped flexible pipe in which a flexible pipe having a predetermined length is connected in a substantially right angle direction through a joint portion is provided, and one end of the L-shaped flexible pipe is grounded. A seismic isolation pipe with the other end connected to the pipe in the building and connected to the pipe in the building while the joint is suspended from the building with a hanging bracket. A suspension fitting with a damper is disclosed in which a piston is mounted and a spring that acts on both sides of the piston to be tightly attached is mounted on both ends of the cylinder so that the piston is displaceable in the cylinder. According to this configuration, when the shaking due to the earthquake stops, the shaking of the suspended piping equipment immediately converges and stops, and there is no need for a large piping space under the building. Can absorb the displacement evenly for a long time It is described that the displacement absorbing ability can be stably maintained over the entire range.
[0004]
Japanese Patent Laid-Open No. 2000-35165 discloses a pipe fixed to one end of the first connecting pipe and the seismic isolation structure, the other end of the first connecting pipe and one end of the second connecting pipe, and Both the other end of the connection pipe of 2 and the pipe fixed to the land side are connected via a joint having flexibility and elasticity, and the first connection pipe and the second connection pipe have a damping function. A seismic isolation structure that is supported by a suspension device having a spring with a spring is disclosed. According to such a configuration, the system can be used for a structure having a large seismic isolation structure, It describes that the same joint can be used even when installed in a building with stable movement, easy installation in a narrow space, and different seismic isolation amounts.
[0005]
In Japanese Patent Laid-Open No. 2000-234485, an L-shaped flexible pipe in which a flexible pipe having a predetermined length is connected in a substantially right angle direction through a joint portion is provided, and one end of the L-shaped flexible pipe is buried in the ground. It is a seismic isolation pipe with the other end connected to the pipe in the building and the joint part suspended from the building side with a hanging bracket. The joint is fixed to the lower surface of the building. A fixed plate, a support member that is locked to the fixed plate and extends radially outwardly, and a suspension fitting that is supported by the support member are disclosed in which the joint portion is suspended and supported. According to the above, there is no need for a large piping space under the building, and when the shaking due to the earthquake stops, the shaking of the piping equipment also converges and stops, and furthermore, each flexible pipe absorbs the displacement evenly for a long time. It is possible to maintain the displacement absorption capacity stably over It has been described.
[0006]
Japanese Patent Application Laid-Open No. 2001-41353 discloses a suspension in which a support is protruded and fixed to a flange to which both ends of a flexible pipe joint are connected, and is supported by a suspension rod whose both ends are supported by a pair of supports. A piping joint structure in which an axial intermediate portion of a flexible pipe joint is supported by means is disclosed. According to such a configuration, an excessive external force is applied to the flexible pipe joint during an earthquake or the like without taking up space. It is described that it can be avoided.
[0007]
[Problems to be solved by the invention]
By the way, the seismic isolation duct has a bellows-like flexible duct body that is formed in a cylindrical shape and is capable of displacement in the axial direction and / or the axial direction, and is integrated with the end of the duct body. And a pair of duct attachment portions, one duct attachment portion being attached to the ground side and the other duct attachment portion being attached to the building side. Such a seismic isolation duct has a problem that fluttering occurs due to the wind pressure due to the flow of gas because the duct body has flexibility.
[0008]
This invention is made | formed in view of this point, The place made into the objective is to provide the seismic isolation duct by which the flapping of a duct main body is suppressed, and its attachment structure.
[0009]
[Means for Solving the Problems]
In the present invention, tension is applied to the flexible duct main body in the axial direction by the spring means.
[0010]
Specifically, the seismic isolation duct of the present invention is
A flexible duct body formed in a cylindrical shape and configured to be capable of displacement in the axial direction and / or axial direction of the other end relative to one end;
Each of a pair of duct mounting portions integrally provided at the end of the duct body,
One end is fixed to the outer surface of the duct body and the other end is fixed to the duct mounting portion, and the other end of the duct body with respect to the one end is maintained to be able to be displaced in the axial direction and / or the axial direction. Spring means for applying tension in the axial direction and expanding and contracting following the displacement of the duct body;
It is characterized by having.
[0011]
According to the above configuration, since the axial tension is applied to the duct body by the spring means and the degree of freedom of the duct body is reduced, flapping of the duct body due to the wind pressure of the gas flow can be suppressed. . In addition, the spring means imparts tension in the axial direction while maintaining displacement in the axial direction and / or the axial direction of the other end with respect to one end of the duct body, and expands and contracts following the displacement of the duct body. The inherent performance of the flexible duct body is not lost by the spring means.
[0012]
In addition, when the seismic isolation duct is installed with the axial direction as the vertical direction so that the duct mounting portion provided with the spring means is on the upper side, the drooping of the duct body due to its own weight is prevented, whereby one end and the other end of the duct body are prevented. Therefore, it is possible to suppress the occurrence of uneven deformation characteristics and to prevent fluttering of the duct body.
[0013]
Here, examples of the spring means include a coil spring and a telescopic member including the coil spring.
[0014]
In the seismic isolation duct of the present invention, the spring means may be provided on any duct mounting part side.
[0015]
According to said structure, since a duct main body will receive tension | tensile_strength from the any duct attachment part side of an axial direction, it does not produce a bias | inclination of a deformation characteristic in the one end and other end of a duct main body, and a seismic isolation duct As well as a balanced one.
[0016]
As for the seismic isolation duct of this invention, it is desirable that the said spring means is provided in three or more places along the circumferential direction.
[0017]
For example, when two spring means are provided so as to face each other, the degree of freedom in the direction perpendicular to the axis of the duct body in the direction orthogonal to the direction connecting the spring means is not largely lost. However, according to the above configuration, since the spring means is provided at three or more locations along the circumferential direction, the degree of freedom in any direction in the axial direction of the duct body is lowered by the action of any spring means. This is because it is possible to effectively prevent fluttering of the duct body.
[0018]
The seismic isolation duct mounting structure of the present invention has an isolation duct interposed between the first and second ducted pipes,
The seismic isolation duct includes a flexible duct body formed in a cylindrical shape and capable of displacement in the axial direction and / or the axial direction of the other end with respect to one end, and an end of the duct body. A pair of duct mounting portions provided integrally, and spring means having one end fixed to the outer surface of the duct main body and the other end fixed to the duct mounting section, the spring means being attached to the duct main body Attaching the pair of ducts so as to apply tension in the axial direction while allowing displacement in the axial direction and / or axial direction of the other end with respect to the one end and to expand and contract following the displacement of the duct body One of the parts is attached to the first duct-attached pipe and the other duct attachment part is attached to the second duct-attached pipe.
[0019]
According to said structure, the effectiveness of the seismic isolation duct of this invention can be acquired, and the flapping of the duct main body by the wind pressure of gas distribution | circulation can be suppressed.
[0020]
In the seismic isolation duct mounting structure of the present invention, the first and second ducted mounting pipes are respectively arranged above and below,
The seismic isolation duct is such that one duct mounting portion provided with the spring means is mounted on the first duct mounted tube and the other duct mounting portion is mounted on the second duct mounted tube. May be.
[0021]
According to such a configuration, it is possible to prevent the duct body from sagging due to its own weight, thereby suppressing the occurrence of bias in deformation characteristics at one end and the other end of the duct body, and suppressing the flapping of the duct body. Can be planned.
[0022]
【The invention's effect】
As described above, according to the seismic isolation duct and the seismic isolation duct mounting structure of the present invention, the degree of freedom of the duct main body is reduced, so that fluttering of the duct main body due to the wind pressure of gas circulation can be suppressed. it can.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0024]
FIG. 1 shows a seismic isolation duct 100 according to an embodiment of the present invention.
[0025]
The seismic isolation duct 100 includes a flexible duct main body 110, a pair of duct mounting portions 120 integrally provided at the end of the duct main body 110, one end on the outer surface of the duct main body 110, and the other end. And coil springs (spring means) 130 respectively fixed to the duct mounting portion 120.
[0026]
The duct main body 110 includes a flexible cylindrical body 111 and a pair of main body side flanges 112 provided at end portions of the cylindrical body 111, respectively.
[0027]
As shown in FIG. 2, the cylindrical body 111 is formed by stacking two glass cloths 111a each having an aluminum foil thereon into a cylindrical shape, and the longitudinal direction between the two glass cloths 111a. A plurality of (8 in FIG. 1) ring-shaped piano wires 111b having substantially the same diameter as the cylindrical body 111 are arranged at equal intervals, and two glass cloths 111a are stitched together so as to sandwich the piano wires 111b. The piano wire 111b is held as a core material. Thereby, the cylindrical body 111 is formed in a bellows shape in which the portion in which the piano wire 111b is embedded becomes the peak and the middle between the adjacent piano wires 111b becomes the valley bottom. Due to the configuration of the cylindrical body 111 as described above, the duct main body 110 has flexibility and is configured to be capable of displacement in the axial direction and / or the axial direction of the other end with respect to one end. Yes.
[0028]
The spring locking pieces 113 are sewn to three or more (three in the present embodiment) along the circumferential direction on the plurality of peaks (third in FIG. 1) from both ends of the bellows-shaped cylindrical body 111, respectively. ing. As shown in FIG. 3, the spring locking piece 113 is formed in a shape such as a combination of a rectangular portion 113a and a trapezoidal portion 113b whose long side is the bottom, and a trapezoidal portion provided with eyelets 113c. A rectangular portion 113a is sewn to the duct body 110 so that 113b protrudes laterally.
[0029]
The main body side flange 112 has an outer member having an L-shaped cross section composed of a cylindrical portion 112a and a flange-like portion 112b extending continuously outward from one end thereof, and a cylindrical shape fitted to the cylindrical portion 112a of the outer member. And an inner member. The cylindrical part 112a and the inner member of the outer member are formed with riveting holes at regular intervals along the circumferential direction, and the flanged part 112b is equally spaced along the circumferential direction. Bolt insertion holes are formed on the top. The main body side flange 112 is configured such that the cylindrical portion 112a of the outer member is fitted on the end of the cylindrical body 111 with the flange portion 112b being the outer side, and the inner member is fitted on the cylindrical body 111. Thus, the end of the cylindrical body 111 is sandwiched and both members are fastened with rivets r so as to be integrally attached to the cylindrical body 111.
[0030]
Each duct mounting portion 120 includes a cylindrical hopper pipe 121 having an outer truncated cone, a small-diameter flange 122 provided at an end portion on the small-diameter side, and a large-diameter side flange provided on an end portion on the large-diameter side. 123.
[0031]
In the hopper tube 121, holes for riveting are formed at equal intervals along the circumferential direction at the respective ends of the small diameter side and the large diameter side.
[0032]
The small-diameter side flange 122 is a member having an L-shaped cross section that includes a cylindrical portion 122a and a flange-like portion 122b that extends continuously outward from one end thereof. In the cylindrical portion 122a, riveting holes are formed at equal intervals along the circumferential direction corresponding to the riveting holes at the end on the small diameter side of the hopper tube 121. Bolt insertion holes are formed in the portion 122b at equal intervals along the circumferential direction. The small-diameter side flange 122 is externally fitted to the small-diameter side end of the hopper tube 121 with the hook-shaped portion 122b as the outside, and is integrally attached to the hopper tube 121 by a rivet r. The minimum inner diameter (corresponding to the valley bottom) of the duct main body 110 is formed to be substantially the same as the inner diameter of the small-diameter flange 122, thereby preventing an increase in wind pressure and a decrease in the air volume in the duct main body 110. Has been.
[0033]
The large-diameter flange 123 is a member having an L-shaped cross section composed of a cylindrical portion 123a and a flange-shaped portion 123b extending outwardly from one end thereof and having an outer diameter equal to the outer diameter of the main body-side flange 112. . In the cylindrical portion 123a, riveting holes are formed at equal intervals along the circumferential direction corresponding to the riveting holes at the end on the large diameter side of the hopper tube 121. Bolt insertion holes are formed in the shaped part 123b at equal intervals along the circumferential direction corresponding to the bolt layer through holes of the flanged part 112b of the main body side flange 112. The large-diameter flange 123 is externally fitted to the large-diameter end of the hopper tube 121 with the hook-shaped portion 123b as the outside, and is integrally attached to the hopper tube 121 by a rivet r.
[0034]
The duct body 110 and each duct mounting portion 120 are formed by a flange-shaped portion 112b of the body-side flange 112 and a flange-shaped portion 123b of the large-diameter side flange 123 abutting each other via the gasket 140, and the two flange-shaped portions 112b, 123b. It is integrated by tightening the nut n through the bolt b through the bolt insertion hole. In addition, at three or more (three in this embodiment) bolting positions corresponding to the spring locking pieces 113, bolt insertion holes 124a and spring locking holes 124b are formed in a rectangular metal plate as shown in FIG. And a spring locking bracket 124 that is passed through the bolt b and fastened together. One end of the coil spring 130 is locked to the eyelet 113 c of the spring locking piece 113, and the other end of the coil spring 130 is locked to the spring locking hole 124 b of the spring locking bracket 124. The coil spring 130 applies tension to the duct body 110 in the axial direction, and maintains the displacement of the other end with respect to one end of the duct body 110 in the axial direction and / or the axial direction. Further, the duct body 110 expands and contracts following the displacement in the axial direction and / or the axial direction of the other end with respect to one end of the duct body 110.
[0035]
According to the seismic isolation duct 100 configured as described above, axial tension is applied to the duct main body 110 by the coil spring 130 and the degree of freedom of the duct main body 110 is reduced. Therefore, the duct main body 110 due to the wind pressure of the gas flow is reduced. Fluttering can be suppressed. In addition, the coil spring 130 applies tension in the axial direction while maintaining displacement in the axial direction and / or the axial direction of the other end with respect to one end of the duct body 110, and follows the displacement of the duct body 110. Since it expands and contracts, the original performance of the duct body 110 having flexibility is not lost by the coil spring 130.
[0036]
Further, when the seismic isolation duct 100 is attached with the axial direction as the vertical direction so that the duct attaching portion 120 provided with the coil spring 130 is on the upper side, the duct body 110 is prevented from drooping due to its own weight, thereby It is possible to suppress the occurrence of uneven deformation characteristics between the one end and the other end, and it is possible to effectively prevent fluttering of the duct body 110.
[0037]
Further, the coil spring 130 is provided on any duct mounting part 120 side, and the duct main body 110 receives axial tension from any duct mounting part 120 side. The seismic isolation duct 100 is balanced without causing a bias in deformation characteristics at the other end.
[0038]
In addition, since three or more coil springs 130 are provided along the circumferential direction on any duct mounting part 120 side, any degree of freedom in the direction perpendicular to the axis of the duct main body 110 is any coil spring 130. Therefore, the flapping suppression of the duct body 110 can be effectively achieved.
[0039]
FIG. 5 shows a seismic isolation duct mounting structure according to an embodiment of the present invention.
[0040]
In this seismic isolation duct mounting structure, the seismic isolation duct 100 according to the embodiment of the present invention is interposed between the building side pipe (first ducted pipe) 200 and the ground side pipe (second ducted pipe) 300. It is set.
[0041]
Each of the building-side pipe 200 and the ground-side pipe 300 has riveting holes formed at equal intervals along the circumferential direction at the ends, and attached flanges 210 and 310 are provided at the ends. Yes. The attached side flanges 210 and 310 are L-shaped in cross section consisting of cylindrical portions 210a and 310a and flanges 210b and 310b extending continuously outward from one end thereof, and the outer diameter is outside the small diameter side flange 122. It is a member equal to the diameter. In the cylindrical portions 210a and 310a, riveting holes are formed at equal intervals along the circumferential direction corresponding to the riveting holes at the ends of the building side pipe 200 and the ground side pipe 300. In addition, bolt insertion holes are formed in the flange portions 210b and 310b at equal intervals along the circumferential direction corresponding to the bolt layer passage holes of the flange portion 122b of the small diameter side flange 122. The attached flanges 210 and 310 are externally fitted to the respective ends of the building-side pipe 200 and the ground-side pipe 300 with the hook-like parts 210b and 310b as front ends, and are attached integrally by rivets r.
[0042]
In the seismic isolation duct 100 and the building-side pipe 200, the flange-shaped portion 122b of the small-diameter side flange 122 and the flange-shaped portion 210b of the attached-side flange 210 are abutted via the gasket 400, and the two flange-shaped portions 122b, 210b It is integrated by tightening the nut n through the bolt b through the bolt insertion hole. Similarly, the seismic isolation duct 100 and the ground-side pipe 300 are configured such that the flange-shaped portion 122b of the small-diameter side flange 122 and the flange-shaped portion 310b of the attached-side flange 310 are abutted with each other via the gasket 400. , 310b are integrated by tightening nuts n through bolts b through bolt insertion holes.
[0043]
In such a seismic isolation duct mounting structure, as shown by the phantom line in FIG. 5, even if the building-side pipe 200 is displaced in the axial direction and / or the axial direction, the flexible duct body 110 is displaced. In addition, the coil spring 130 expands and contracts following the displacement in the axial direction and / or the axial direction of the other end with respect to one end of the duct main body 110.
[0044]
According to the seismic isolation duct mounting structure having the above-described configuration, the effect of the seismic isolation duct 100 according to the above-described embodiment of the present invention can be obtained, and flapping of the duct main body 110 due to the wind pressure of gas circulation can be suppressed. .
[0045]
Further, although the seismic isolation duct 100 is attached so that the axial direction is in the vertical direction, the coil spring 130 prevents the duct body 110 from sagging due to its own weight, thereby deforming the duct body 110 at one end and the other end. It is possible to suppress the occurrence of characteristic bias and to suppress flapping of the duct body 110.
[0046]
In the above embodiment, the duct mounting portion 120 is configured by the hopper pipe 121, the small diameter side flange 122, and the large diameter side flange 123, but is not particularly limited thereto, as shown in FIG. The duct mounting portion is constituted by the main body side flange 112 of the duct main body 110, and the main body side which is the duct mounting portion via the gasket 400 on the mounted side flanges 210 and 310 respectively provided in the building side piping 200 and the ground side piping 300. You may make it comprise a duct attachment structure by attaching the flange 112. FIG.
[0047]
Moreover, in the said embodiment, although the duct main body 110 was made into the cylindrical thing, it is not specifically limited to this, The cylindrical thing of polygonal cross sections, such as a square cross section, may be sufficient.
[Brief description of the drawings]
FIG. 1 is a side view of a seismic isolation duct according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of a duct body.
FIG. 3 is a plan view of a spring locking piece.
FIG. 4 is a plan view of a spring locking bracket.
FIG. 5 is a side view of the seismic isolation duct mounting structure according to the embodiment of the present invention.
FIG. 6 is a side view of a seismic isolation duct mounting structure according to another embodiment of the present invention.
[Explanation of symbols]
100 seismic isolation duct 110 duct main body 111 cylindrical body 111a glass cloth 111b piano wire 112 main body side flange 112a, 122a, 123a, 210a, 310a cylindrical part 112b, 122b, 123b, 210b, 310b hook-like part 113 spring locking piece 113a Rectangular portion 113b Trapezoidal portion 113c Eyelet 120 Duct mounting portion 121 Hopper pipe 122 Small diameter flange 123 Large diameter flange 124 Spring locking bracket 124a Bolt insertion hole 124b Spring locking hole 130 Coil spring (spring means)
140,400 Gasket 200 Building-side piping (first duct-attached pipe)
210, 310 Mounted flange 300 Ground side piping (second duct mounted tube)
b Bolt n Nut r Rivet

Claims (5)

A flexible duct body formed in a cylindrical shape and configured to be capable of displacement in the axial direction and / or axial direction of the other end relative to one end;
Each of a pair of duct mounting portions integrally provided at the end of the duct body,
One end is fixed to the outer surface of the duct body and the other end is fixed to the duct mounting portion, and the other end of the duct body with respect to the one end is maintained to be able to be displaced in the axial direction and / or the axial direction. Spring means for applying tension in the axial direction and expanding and contracting following the displacement of the duct body;
A seismic isolation duct characterized by comprising: In the seismic isolation duct according to claim 1,
A seismic isolation duct characterized in that the spring means is provided on any duct mounting part side. In the seismic isolation duct according to claim 1 or 2,
The seismic isolation duct, wherein the spring means is provided at three or more locations along the circumferential direction. A seismic isolation duct mounting structure in which a seismic isolation duct is interposed between the first and second ducted mounting pipes,
The seismic isolation duct includes a flexible duct body formed in a cylindrical shape and capable of displacement in the axial direction and / or the axial direction of the other end with respect to one end, and an end of the duct body. A pair of duct mounting portions provided integrally, and spring means having one end fixed to the outer surface of the duct main body and the other end fixed to the duct mounting section, the spring means being attached to the duct main body Attaching the pair of ducts so as to apply tension in the axial direction while allowing displacement in the axial direction and / or axial direction of the other end with respect to the one end and to expand and contract following the displacement of the duct body One of the parts is attached to the first duct-attached pipe and the other duct-attached part is attached to the second duct-attached pipe. In the seismic isolation duct mounting structure according to claim 4,
The first and second ducted pipes are arranged above and below,
The seismic isolation duct is characterized in that one duct attachment portion provided with the spring means is attached to the first duct-attached tube and the other duct attachment portion is attached to the second duct-attached tube. Seismic isolation duct mounting structure.

Images