JP4762606B2 - Seismic isolation duct - Google Patents

Description

  The present invention relates to a seismic isolation duct capable of preventing a pipe path from being damaged due to a vibration such as an earthquake in a base isolation building.

  When a metal duct fixed on the ground side and a metal duct fixed on the seismic isolation building side are connected to form a piping path, the metal ducts are connected without allowing relative displacement. Then, when a relative displacement occurs between the ground and the base-isolated building due to an earthquake or the like, the connecting portion of the metal duct may be damaged. For this reason, the seismic isolation duct which has a stretching property and bending property is interposed between the metal duct on the ground side and the metal duct on the seismic isolation building side. However, this type of seismic isolation duct has a drawback in that it easily deforms due to its own weight, such as its central portion being bent downward when arranged in the horizontal direction. For this reason, there is a risk that the gas flow inside the seismic isolation duct may be obstructed, or excessive force will act on both ends of the seismic isolation duct, damaging the seismic isolation duct or the metal duct connected to it. It was.

  In view of such a situation, the present applicant has already proposed a seismic isolation duct in which bending due to its own weight is limited (Patent Document 1). The seismic isolation duct of Patent Document 1 supports the duct body in a suspended state from the ceiling using spring means. As described above, by using the spring means for suspending the duct body, it is possible to always keep the suspending height of the seismic isolation duct the same. Patent Document 1 also proposes a seismic isolation duct in which a suspension rod for suspending the duct body is disposed above the duct body, and the suspension bar and the duct body are connected by spring means. Thereby, even if it is a case where a ceiling part does not exist above a duct main body, a duct main body can be supported in a suspended state.

Japanese Patent Laying-Open No. 2003-302094 (Claims, Effects of the Invention, FIGS. 1 and 8)

  However, since the seismic isolation duct described in Patent Document 1 uses spring means for suspending the seismic isolation duct, a hanging metal fitting for connecting the spring means is additionally required. Reduction was not always easy. Further, the seismic isolation duct described in Patent Document 1 has a possibility that the duct body is locally pulled by the spring means and broken because the spring means supports the duct body with a point. In order to solve this problem, measures have been taken such as connecting the lower end of the spring means to a rigid rod attached across the width of the upper surface of the duct body, and distributing the force applied to the duct body. Since the weight of the rod increases, there is a drawback that it is difficult to reduce the weight of the seismic isolation duct.

  The present invention has been made in order to solve the above-described problems, and provides a seismic isolation duct that is simple in structure and easy to reduce manufacturing costs while being able to limit bending due to its own weight.

The above-mentioned problem is provided with a duct body having elasticity and flexibility and a suspension bar for hanging the duct body, and suspension rod support portions for supporting the suspension bar are provided at both ends of the duct body. In the seismic isolation duct, the suspension part for suspending the duct body from the suspension rod is provided in at least one place of the middle part of the duct body (all parts excluding both ends of the duct body), a protrusion that said hanging element is provided on an outer peripheral portion of the duct body, seismic isolation, wherein a through-hole H ₁ for loosely inserted the hanging bar in projecting piece is provided It is solved by providing a duct.

  The material of the suspending part of the seismic isolation duct is not particularly limited, and for example, it may be a base fabric made of glass fiber deposited with aluminum or the like (so-called aluminum glass cloth). A sheet (for example, tarpaulin) coated with a resin (including rubber) is preferable. As a result, it is possible not only to make the suspension part light and durable, but also to make it flexible and excellent in elasticity, so that even if vibration occurs, the duct body of the seismic isolation duct It is easy to always keep the same suspension height.

  The duct body of the seismic isolation duct is not particularly limited as long as it has stretchability and bendability, but has a flexible cylindrical portion and a plurality of shape retaining materials for maintaining the cross-sectional shape of the cylindrical portion. Preferably, the plurality of shape-retaining materials are arranged at predetermined intervals along the central axis of the cylindrical portion. Thereby, a duct main body can be formed in a bellows shape, and it can be made more excellent in elasticity and flexibility. The form of the shape retaining material used for the duct body is not particularly limited, but a steel wire or the like formed in a frame shape is usually used. When a frame-shaped material is used as the shape retaining material, various shapes such as a square frame and a round frame can be employed.

  The material of the cylindrical part of the duct body is not particularly limited. For example, an aluminum glass cloth or the like may be used. However, a sheet (for example, tarpaulin or the like) in which a base fabric is coated with a resin (including rubber). ). Thereby, it is possible not only to make the cylindrical portion of the duct main body light and strong, but also to make it flexible and excellent in elasticity.

  It is preferable that the lower end portion of the hanging portion of the seismic isolation duct is fixed to a portion of the duct main body to which the shape-retaining material is attached (a portion that becomes a bellows crest). Thereby, it becomes possible to suppress the deformation | transformation of the duct main body which may arise by being pulled by the suspension part. Moreover, it is also preferable that the lower end part of the hanging part is fixed along the width direction of the duct body. Thereby, the force applied to the duct main body from the hanging portion can be dispersed to further prevent the duct main body from being deformed or torn.

The support structure of the suspension rod support portion of the seismic isolation duct is not particularly limited as long as it can support the suspension rod. Usually, the suspension rod support portion has a through hole H ₂ for loosely inserting the suspension rod. Is provided. At this time, the through-hole H ₂ is preferably formed to be longer in a direction parallel to the width direction of the duct body (horizontal direction). As a result, the suspension rod can be supported in a slidable state in a direction parallel to the width direction of the duct body, and the horizontal direction of each duct connected to both ends of the seismic isolation duct can be relatively small. A larger displacement can be secured.

  The suspension rod support portion of the seismic isolation duct may be provided directly on the duct body, but usually a connecting frame for connecting the duct body to another duct (usually a metal duct) is provided at both ends of the duct body. The suspension rod support part is provided on an outer peripheral part of the connection frame.

  As described above, according to the present invention, it is possible to provide a seismic isolation duct that has a simple structure and can be easily reduced in manufacturing cost while being able to limit the bending due to its own weight. In addition, it is possible to prevent the duct body from being broken by dispersing the force applied to the duct body from the hanging portion. Further, the duct body can be further improved in stretchability and flexibility. Furthermore, it is possible to make the seismic isolation duct lightweight and easy to install and maintain.

  A preferred embodiment of the seismic isolation duct of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a perspective view showing a seismic isolation duct 100 of the present invention. FIG. 2 is a side view showing the seismic isolation duct 100 of the present invention. 3 is a cross-sectional view showing a state where the seismic isolation duct 100 of the present invention is cut along YY in FIG. FIG. 4 is a cross-sectional view of a sheet forming the cylindrical portion 111 of the seismic isolation duct 100 of the present invention. 5 is a cross-sectional view showing a state where the seismic isolation duct 100 of the present invention is cut along XX in FIG. FIG. 6 is a plan view showing the duct body 110 when in a bent state. FIG. 7 is an enlarged perspective view of a portion A in FIG. 1 of the seismic isolation duct 100 of the present invention. As shown in FIGS. 1 and 2, the seismic isolation duct 100 according to this embodiment includes a duct main body 110, a suspension rod 120, a suspension rod support portion 130, a suspension portion 140, and a retaining means 150. A frame 160 is provided.

[Duct body]
The duct body 110 is for connecting the pipes of two metal ducts (not shown) to each other. A gas flows inside the duct body 110. The seismic isolation duct 100 is normally constructed so that the duct body 110 is horizontal. In this embodiment, the duct main body 110 includes a flexible cylindrical portion 111 and a shape-retaining material 112 for maintaining the cross-sectional shape of the cylindrical portion 111, as shown in FIG.

  As shown in FIG. 4, the tubular portion 111 is formed by weaving a wire 113 in two directions to form a base fabric, and a sheet (tarporin) obtained by covering the front and back surfaces of the base fabric with a resin 114. It is formed in a cylindrical shape. At this time, it is preferable that each of the wire rods 113 is woven in a direction inclined with respect to the central axis of the cylindrical portion 111. Thereby, the cylindrical part 111 can be easily expanded and contracted in the central axis direction and the radial direction. The material of the wire 113 is not particularly limited, but a light and strong resin such as nylon is used. The material of the resin 114 is not particularly limited, but in this embodiment, vinyl chloride is employed.

  The mesh opening (the mesh opening of the base fabric) when weaving the wire rod 113 is not particularly limited, but if it is too small, the frictional force received by the wire rod 113 increases and the cylindrical portion 111 is in the central axis direction or radial direction. Therefore, it is usually set to 0.1 mm or more. The mesh opening of the base fabric is preferably 0.5 mm or more, and more preferably 1 mm or more. On the other hand, if the opening of the base fabric is too large, the strength of the tubular portion 111 may be significantly reduced. In this embodiment, the mesh opening of the base fabric is set to 2 to 3 mm.

  As shown in FIG. 3, the shape retaining material 112 uses a steel wire formed in a square frame shape. The shape-retaining material 112 may be attached to the outer peripheral portion of the tubular portion 111, but in the seismic isolation duct 100 of this embodiment, it is attached to the inner peripheral portion of the tubular portion 111. As shown in FIG. 5, the tubular portion 111 is folded back and overlapped with the shape retaining material 112 as a boundary, and is sewn at the overlapping portion (sewn portion 115). Thereby, position shift and drop-off of the shape retaining material 112 can be prevented. The sewn portion 115 may be provided along the entire circumference of the shape retaining material 112. However, in the seismic isolation duct 100 of the present embodiment, as shown in FIG. Only wears it. Thereby, the sewing cost can be reduced. At the upper side sewn portion 115, the suspending portion 140 is also sewn at the same time, thereby reducing the sewing cost.

  Since the duct main body 110 of this embodiment uses tarpaulin as the material of the cylindrical portion 111, as shown in FIG. Therefore, the displacement amount of the duct body 110 is obtained by adding the displacement amount due to the fan deformation and the displacement amount due to the shear deformation. For this reason, compared with the case where an aluminum glass cloth etc. are used for the raw material of the cylindrical part 111, it becomes possible to ensure the same displacement amount with a short dimension, and can reduce construction space and manufacturing cost. Moreover, while being excellent in durability, it is lightweight and has excellent airtightness.

[Hanging bar]
The suspension rod 120 is for suspending the duct body 110. In the present embodiment, a hollow pipe is used as the suspension rod 120 to reduce its weight. As shown in FIGS. 1 and 2, both end portions of the suspension rod 120 are loosely inserted into through holes H < _b > ₂ provided in the suspension rod support portion 130. At both ends of the hanging bar 120, retaining means 150 for preventing the falling out from the through-hole H ₂ provided in the rod support portion 130 hanging rod 120 is suspended is provided. The retaining means 150 will be described later.

[Hanging rod support]
The suspension rod support portion 130 serves to support the suspension rod 120 horizontally, and is fixed to the upper surface of the outer peripheral portion of the connection frame 160 described later, as shown in FIGS. 1 and 2. The suspension rod support portion 130 is formed of a highly rigid material such as metal so that the support height of the suspension rod 120 can be kept constant. The hanging rod support portion 130 is provided with a through hole H ₂ in the front-end portion of the hanging rod 120 is loosely inserted. Horizontal width of the through hole H ₂ is formed longer than the vertical dimension. For this reason, when the duct main body 110 is bent in the horizontal direction, the suspension rod 120 and the suspension rod support portion 130 interfere with each other, so that it is difficult for the duct main body 110 to be bent. The width in the vertical direction of the through hole H ₂ is set to be slightly larger than the diameter of the suspension rod 120.

[Hanging part]
The suspension part 140 is for suspending the duct body 110 from the suspension bar 120. In the present embodiment, the hanging part 140 is made of the same material (tarporin) as that used for the tubular part 111 of the duct body 110. For this reason, the hanging part 140 is lightweight while being excellent in durability and excellent in elasticity. Therefore, even when the duct body 110 is bent in the horizontal direction, the suspension height of the duct body 110 can be kept constant.

In the present embodiment, as shown in FIG. 1, the lower end portion of the hanging portion 140 is formed to have a width substantially the same as the width of the duct main body 110 and is fixed along the width direction of the duct main body 110. . The width of the upper end part of the hanging part 140 is formed narrow, and the weight reduction of the seismic isolation duct 100 is aimed at. A through hole H <b> ₁ is provided in the front-rear direction at the upper part of the suspension part 140, and the suspension bar 120 is loosely inserted. In this embodiment, the through-holes H ₁ and prevents breakage of the hanging portion 140 together are fitted into the eyelet fitting, to facilitate smooth sliding.

[Retaining means]
Retaining means 150 has a intended to prevent the rods 120 suspended from the through-hole H ₂ provided in the hanging rod support portion 130 from falling out. In this embodiment, as shown in FIG. 7, the retaining means 150 includes a bolt 151 and a nut 152 that is screwed into the bolt 151. The bolt 151 is inserted into a through hole (not shown) provided in the vertical direction at the end of the suspension rod 120 and is fixed to the suspension rod 120 by a nut 152. The length of the bolt 151 is suspended maximum diameter (horizontal length) of the rod supporting portion through hole H ₂ provided in 130 is longer than the suspension rod 120 is the direction of the bolt 151 to rotate changed even, so that the never fall off from the through hole of H ₂ rod support portion 130 hanging the end of the hanging bar 120.

[Connection frame]
The connection frame 160 is for connecting the seismic isolation duct 100 to a metal duct (not shown), and is provided at both ends of the duct body 110. In this embodiment, a flange as shown in FIG. 1 is provided on the outer peripheral portion of the connecting frame 160, and the flange is provided with a plurality of through holes for inserting bolts. For this reason, the seismic isolation duct 100 and the metal duct can be connected by attaching the flange of the connection frame 160 to the flange provided on the metal duct and tightening it with a bolt or the like. A gasket is usually disposed between the flange of the seismic isolation duct 100 and the flange of the metal duct in order to improve the airtightness and watertightness of the piping path.

It is the perspective view which showed the seismic isolation duct of this invention. It is the side view which showed the seismic isolation duct of this invention. It is sectional drawing which showed the state which cut | disconnected the seismic isolation duct of this invention by YY in FIG. It is sectional drawing of the sheet | seat which forms the cylindrical part of the seismic isolation duct of this invention. It is sectional drawing which showed the state which cut | disconnected the seismic isolation duct of this invention by XX in FIG. It is the top view which showed the duct main body when it exists in a bending state. It is the perspective view which expanded the A section in FIG. 1 of the seismic isolation duct of this invention.

Explanation of symbols

100 seismic isolation duct 110 duct body 111 cylindrical portion 112 Hokatachizai 113 wire rod 114 resin 115 stitched portion 120 hanging bar 130 hanging rod support portion 140 suspended portion 150 retaining means 151 volts 152 nuts 160 connecting frame H ₁ through hole (Hanging part)
H ₂ through hole (suspending rod support)

Claims (1)

A cylindrical part made of a sheet in which a base fabric formed by weaving a wire is covered with a resin, and a plurality of rectangular frame-shaped retention shapes that are attached to the inner peripheral part of the cylindrical part and maintain the cross-sectional shape of the cylindrical part A bellows-shaped duct body composed of materials ,
A pair of connecting frames attached to both ends of the duct body to connect the duct body to another duct;
A suspension rod disposed above the duct body and for suspending the duct body ;
Respectively provided on the outer peripheral portion upper face of the connecting frame to support the hanging bar, and hanging rod supporting portion end of the through hole H ₂ hanging rods formed therein is loosely inserted,
It consists of a projecting piece with the same material as the cylindrical part formed in a triangular shape, and its lower edge is sewn along the width direction of the duct body at the part where the shape-retaining material is attached in the middle part of the cylindrical part a hanging element which intermediate portion of the through hole H hanging ₁ bar formed therein is loosely inserted,
And consisting of
A seismic isolation duct characterized in that the cylindrical portion is overlapped and sewn at a portion where the hanging portion is sewn with respect to the cylindrical portion, thereby preventing displacement of the shape retaining material .

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