JP2021095708A - Aseismic base isolation pull box - Google Patents

Abstract

To provide an aseismic base isolation pull box allowing protection of a distribution cable by preventing cable exposure and load on the distribution cable caused by vibration upon an earthquake and like to be absorbed.SOLUTION: An aseismic base isolation pull box 1 is configured to oppositely arrange a lower box 2 secured on the ground G through a base isolation layer 5 and having a first hole part through which a distribution cable 19 is inserted, and an upper box 3 secured on a base part 11 of a building 10, arranged opposite to the lower box 2 and having a second hole part through which the distribution cable 19 is inserted. A first pipe body 18 is connected to the first hole part, and a second pipe body 22 is connected to the second hole part, and the distribution cable 19 is inserted in the first pipe body 18, the second pipe body 22, and the aseismic base isolation pull box 1. The distribution cable 19 with a coiled extra part is accommodated in an inner space formed by the lower box 2 and the upper box 3, and the lower box 2 and the upper box 3 relatively vibrate in a horizontal direction to positionally deviate at the time of an earthquake.SELECTED DRAWING: Figure 3

Description

The present invention relates to a seismic isolation pull box for drawing various wiring cables such as communication lines such as optical cables and electrical wiring into a building from the ground or the like.

Conventionally, in a seismic isolated building, when a wiring cable such as a communication line or an electric wiring is pulled into the building from the ground or a utility pole, the edge of the cable rack is cut between the ground side and the building side, and the wiring cable is provided at the upper part of the plate provided between them. Is exposed and rolled up in a rugged shape to connect. Therefore, even if a load is applied to the wiring cable due to rolling in the event of an earthquake or the like, the wiring cable can be absorbed by a hollow extra length so that the wiring cable can be displaced or followed.
For example, in the general wiring equipment shown in FIGS. 7A and 7B, a wiring cable 102 such as an electric wire or a communication line penetrating the side wall 101 of the foundation 100 constructed on the ground is attached to a plate at the bottom of the foundation 100. The upper extra length portion 102a is left to loosen, and the other end side of the wiring cable 102 is supported by a hanging metal fitting 104 or a rack provided on the building base 103 (see Non-Patent Document 1).

CERA-DESIGN Architectural Structural Design "Seismic Isolation Design Note" "2010.04 Edition Appendix 4 Episode" Appendix-4. Seismic Isolation Member Special Specification Example "Appendix pp. 4-3" 4. Retracting electricity, telephone, etc. ”[Searched on November 20, 1991], Internet (http://cera.world.coocan.jp/)

However, in the wiring equipment described in Non-Patent Document 1, the extra length 102a around which the wiring cable 102 is wound is exposed on the bottom plate of the foundation 100, which is liable to deteriorate or be damaged and is a safety problem. was there. Further, when the wiring cable 102 vibrates due to an earthquake or the like, the wiring cable 102 may be caught by a foreign substance and may be cut or damaged without being displaced following the vibration.

The present invention has been made in view of such a problem, so that the wiring cable can be prevented from being exposed to the outside and protected, and the load applied to the wiring cable due to vibration can be absorbed even in the event of an earthquake or the like. The purpose is to provide a seismic isolation pull box.

The seismic isolation pull box according to the present invention is fixed to the ground side and has a first hole for inserting a wiring cable, and is fixed to the building side and is arranged facing the first box. A second box having a second hole through which the wiring cable is inserted is provided, and the wiring cable is stored with an extra length in the internal space formed by the first box and the second box. The box and the second box are characterized in that they are relatively vibrable.
According to the present invention, since the wiring cable is stored in the internal space of the first box and the second box with an extra length around which the wiring cable is wound, the wiring cable is protected from the outside and safety is enhanced. Even if the first box and the second box are relatively laterally displaced due to vibration due to an earthquake or the like, the extra length can be extended to follow the displacement, so that the disconnection or damage of the wiring cable can be suppressed.

Further, it is preferable that a hanging support portion for suspending and supporting the wiring cable is provided in the second box so as to face the second hole portion.
Since the wiring cable is suspended and supported in the second box so as to face the second hole, the wiring cable is bent even if the first box and the second box move side by side due to an earthquake or the like. Therefore, it is possible to prevent the cable from being cut or damaged by being sandwiched between the first box and the second box.

Further, a sealing member may be provided at the end of the opening that the first box and the second box come into contact with.
By sealing the ends of the first box and the second box with a sealing member, foreign matter does not enter or be tampered with from the outside.

Further, it is preferable that the first tube body through which the wiring cable is inserted is connected to the first hole portion, and the second tube body through which the wiring cable is inserted is connected to the second hole portion.
Not only the inside of the seismic isolation pull box but also the external wiring cable can be protected by the first pipe body and the second pipe body, which enhances safety.

According to the seismic isolation pull box according to the present invention, the wiring cable can be stored and protected in the internal space formed by the first box and the second box, and the safety is high. Further, even if a load such as the first box and the second box containing the wiring cable vibrating and laterally shifting and the wiring cable is pulled due to an earthquake or the like is applied, the wiring cable is displaced and can be absorbed by the extra length portion.

It is a perspective view of the seismic isolation pull box by embodiment of this invention. It is a perspective view of the seismic isolation pull box in a state where the upper box and the lower box are shifted. It is explanatory drawing of the state which installed the seismic isolation pull box between the ground and a building. (A) and (b) are explanatory views of the state where the upper box and the lower box of the seismic isolation pull box are displaced in the horizontal direction. (A), (b), and (c) are explanatory views of a state in which the upper box and the lower box of the first comparative example are displaced. (A) and (b) are explanatory views of the state where the upper box and the lower box of the second comparative example are displaced. (A) is a cross-sectional view of a wiring facility according to a conventional example, and (b) is a diagram showing an extra length portion of a wiring cable.

Hereinafter, the seismic isolation pull box according to the embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 4 show a seismic isolation pull box 1 according to an embodiment. The seismic isolation pull box 1 shown in FIG. 1 includes, for example, a lower box 2 and an upper box 3 arranged vertically. In the lower box 2, for example, a lower surface 6 made of a steel plate and four side surfaces 7a, 7b, 7c, and 7d are fixed to a rectangular parallelepiped metal frame, and the upper surface has an opening 8. The lower surface 6 of the lower box 2 is fixed to the foundation 4 on the ground G via the seismic isolation layer 5. The seismic isolation layer 5 has a structure in which a plurality of elastic bodies such as rubber are laminated, and reduces the transmission of the vibration of the ground G to the lower box 2 in the event of an earthquake or the like.

The upper box 3 is connected to the base 11 of the building 10, for example, the upper surface 12 made of a steel plate and the four side surfaces 13a, 13b, 13c, 13d are fixed to a rectangular parallelepiped metal frame, and the lower surface is an opening 14 It is said that. Moreover, the upper surface 12 is fixed to the base 11 of the building 10. The building 10 is a seismic isolated building connected to the ground G via a seismic isolated layer (not shown).
The seismic isolation pull box 1 normally has one of the side surfaces 7a, 7b, 7c, 7d forming the opening 8 of the lower box 2 and the side surfaces 13a, 13b, 13c, 13d forming the opening 14 of the upper box 3. For example, a gasket 15 is provided as a sealing member on the entire circumference of the ends of the side surfaces 7a, 7b, 7c, and 7d of the lower box 2.

As a result, under normal conditions, the gasket 15 of the lower box 2 and the lower ends of the side surfaces 13a to 13d of the upper box 3 are brought into contact with each other, and the opening 8 of the lower box 2 and the opening 14 of the upper box 3 are liquidtightly sealed. Has been done. Moreover, in the event of an earthquake or the like, the lower box 2 vibrates in conjunction with the ground G and the seismic isolation layer 5, and the upper box 3 vibrates in conjunction with the building 10, so that it can slide relatively horizontally. Has been done. During vibration, the lower box 2 and the upper box 3 are not affected by each other's movements.

In FIG. 2, one or more, for example, six first hole portions 17 are formed on one side surface 7a of the lower box 2, and for example, a metal first tube body 18 is formed in each first hole portion 17. One end of each is connected. The first hole portions 17 provided on the one side surface 7a are formed in a row in the longitudinal direction of the side surface 7a, for example, but the arrangement of the first hole portions 17 can be arbitrarily formed.
A wiring cable 19 such as a communication line such as an optical fiber, an electric wire, or a telephone line is inserted in the first tube body 18. The other end of the first tubular body 18 is connected to, for example, another tubular body or closure provided in a manhole (not shown). In the present embodiment, for example, one wiring cable 19 is inserted in each first pipe body 18, but a plurality of wiring cables 19 may be bundled or inserted separately.

Further, in FIG. 1, the other side surface 13c of the upper box 3 on the side facing one side surface 7a of the lower box 2 is formed with the same number of second hole portions 21 as the first hole portion 17, respectively. For example, one end of a metal second tube 22 is connected to the second hole 21. The second hole portions 21 provided on the other side surface 13c are formed in a row in the longitudinal direction of the side surface 13c, for example, but the arrangement of the second hole portions 21 can be arbitrarily formed.
A wiring cable 19 is inserted in the second pipe body 22. The other end of the second pipe 22 is connected to, for example, a communication device in a server room in the building 10. The wiring cables 19 provided on the outside of the seismic isolation pull box 1 are all covered and protected by the first pipe body 18 and the second pipe body 22.

As shown in FIG. 3, the wiring cable 19 inserted into the first pipe body 18 of the lower box 2 and the second pipe body 22 of the upper box 3 is located in the internal space of the closed lower box 2 and the upper box 3. It is stored in a rolled state. The portion of the wiring cable 19 around which the tongue is wound is referred to as an extra length portion 19a, and is preferably held in the lower box 2.
In the event of an earthquake or the like, as shown in FIGS. 4A and 4B, the ground G, the seismic isolation layer 5, and the building 10 vibrate in the horizontal direction, causing the lower box 2 and the upper box 3 to shift in position. Is assumed. Even in that case, the wiring cable 19 in the internal space of the seismic isolation pull box 1 is set to a length such that the extra length portion 19a can be displaced and maintained in a bent state. Therefore, in the event of an earthquake, the extra length portion 19a of the wiring cable 19 can be shortened or lengthened to absorb vibration.

Moreover, inside the upper box 3, a plurality of suspension support portions 24 are hung from the upper surface 12 at positions facing each second pipe body 22. Each suspension support portion 24 has, for example, a hook-shaped or ring-shaped support portion for supporting the wiring cable 19. Moreover, each suspension support portion 24 is provided at a position facing each second hole portion 21 on the side surface 13c, and each wiring cable 19 is arranged substantially linearly from the suspension support portion 24 to the second pipe body 22. Therefore, it is possible to prevent them from being entangled with each other or being bitten between the lower box 2 and the upper box 3.
In the seismic isolation pull box 1 according to the present embodiment, the relative displacement amount (displacement amount) in the horizontal direction between the seismic isolation layer 5 and the building 10 at the time of an earthquake is set to, for example, a maximum of 700 mm, and the lower box 2 and the upper box 3 are vertically and horizontally The length of the above was set to, for example, about twice, about 1500 mm.

The seismic isolation pull box 1 according to the present embodiment has the above-described configuration, and its operation will be described next.
In a normal state without an earthquake, as shown in FIGS. 1 and 3, the seismic isolation pull box 1 is arranged so that the lower box 2 and the upper box 3 are vertically stacked without being displaced, and a gasket. It is arranged liquid-tightly via 15. The wiring cable 19 is covered and protected by the first pipe body 18, the second pipe body 22, and the seismic isolation pull box 1 between the seismic isolation layer 5 of the ground G and the base 11 of the building 10. In this state, currents, communication signals, and the like can be transmitted and received between the communication equipment and the like in the server room in the building 10 and the outside via the wiring cable 19.

Next, when an earthquake or the like occurs, the vibration of the building 10 is delayed with respect to the vibration of the ground G, so that the relative movement of the seismic isolation layer 5 of the ground G and the relative movement of the base 11 of the building 10 occur. .. Since the lower box 2 is linked to the vibration of the seismic isolation layer 5 of the ground G and the upper box 3 is linked to the vibration of the building 10, the horizontal direction between the lower box 2 and the upper box 3 of the seismic isolation pull box 1 Misalignment occurs.
For example, as shown in FIG. 4A, when the upper box 3 moves relative to the lower box 2 in the direction away from the first pipe body 18, the wiring cable 19 is pulled in the internal space of the seismic isolation pull box 1. .. Even in this case, the wiring cable 19 in the internal space of the seismic isolation pull box 1 is maintained in a state in which the extra length portion 19a is not completely eliminated and the deflection is small and the wiring cable 19 is displaced. Moreover, since the wiring cable 19 is supported by the suspension support portion 24 at a position facing the second pipe body 22, it is possible to prevent the wiring cable 19 from hanging and being sandwiched between the lower box 2 and the upper box 3.

Further, as shown in FIG. 4B, when the upper box 3 moves relative to the lower box 2 in the direction approaching the first pipe body 18, the extra length of the wiring cable 19 in the internal space of the seismic isolation pull box 1 The portion 19a is further bent. Moreover, since the wiring cable 19 is supported by the suspension support portion 24 at the opposite position near the second pipe body 22, the wiring cable 19 is displaced in the lower box 2.
Then, when the vibrations of the ground G and the building 10 converge, the restoring force of the building 10 returns the lower box 2 and the upper box 3 to the original overlapping positions as shown in FIG. Therefore, the extra length portion 19a of the wiring cable 19 is held in a wound state in the internal space of the seismic isolation pull box 1.

Next, a comparative example related to the seismic isolation pull box 1 according to the present embodiment will be described with reference to FIGS. 5 and 6.
First, in the seismic isolation pull box 1 according to the present embodiment, a case where the suspension support portion 24 is not provided in the upper box 3 will be described with reference to FIG. When the suspension support portion 24 is not provided, as shown in FIG. 5A, the wiring cable 19 is held by winding the extra length portion 19a in the lower box 2 and the upper box 3 which do not shift in position in the absence of an earthquake. Will be done.

Then, as shown in FIG. 5B, when an earthquake occurs and the lower box 2 and the upper box 3 move relatively in the direction in which they are separated from each other and are displaced by about 700 mm, a part of the wiring cable 19 is pulled. It is extended and hangs down in a substantially U shape between the side surface 7c of the lower box 2 and the side surface 13c of the upper box 3, and one side is supported by the second tubular body 22. After that, as shown in FIG. 5C, when the lower box 2 and the upper box 3 are relatively close to each other, a part of the wiring cable 19 bent in a U shape is sandwiched between the side surface 7c and the side surface 13c. It may be damaged or cut. It is preferable to install the suspension support portion 24 in order to avoid such a defect.

Next, a case where the size of the lower box 2 and the upper box 3 is assumed to be displaced at the time of an earthquake is, for example, about 700 mm will be described with reference to FIG.
In this case, in the absence of an earthquake, as shown in FIG. 6A, the wiring cable 19 is held by winding the extra length portion 19a in the lower box 2 and the upper box 3 which do not shift in position. In the vicinity of the second pipe body 22, the wiring cable 19 is supported by a suspension support portion 24 hanging from the upper surface 12 of the upper box 3 and inserted into the second pipe body 22.
Next, as shown in FIG. 6B, when an earthquake occurs and the lower box 2 and the upper box 3 move relatively in the direction in which they are separated from each other and are displaced, the side surface 7c of the lower box 2 and the upper box 3 are displaced. The wiring cable 19 may be sandwiched between the side surface 13a of 3 and may be cut or damaged.
Therefore, in order to avoid such a problem, it is preferable that the sizes of the lower box 2 and the upper box 3 in the vertical and horizontal directions are formed to be larger than the displacement amount of 700 mm at the time of an earthquake.

As described above, according to the seismic isolation pull box 1 according to the present embodiment, the lower box 2 and the upper box 3 that separate the wiring cable 19 vertically between the seismic isolation layer 5 of the ground G and the base 11 of the building 10 are used. An enclosure and an extra length portion 19a were provided to allow a margin to be wound around the tongue. Therefore, the seismic isolation pull box 1 can cover and protect the wiring cable 19, and even if the lower box 2 and the upper box 3 are displaced in the horizontal direction due to an earthquake or the like, they can be protected from being damaged or cut. Moreover, when the earthquake converges, the lower box 2 and the upper box 3 return to their original overlapping positions, and the wiring cable 19 can be returned to the state in which the extra length portion 19a is wound.
Further, since the wiring cable 19 is supported by the hanging support portion 24 hanging near the second pipe body 22 of the upper box 3, the wiring cable 19 is supported even if the lower box 2 and the upper box 3 move relative to each other due to an earthquake or the like. Can be prevented from bending and being pinched.

Further, since the vertical and horizontal sizes of the lower box 2 and the upper box 3 are formed to be larger than the maximum displacement amount of 700 mm assumed at the time of an earthquake, even if the lower box 2 and the upper box 3 move relative to each other in the opposite direction at the time of an earthquake, the lower box 3 is formed. The 2 and the upper box 3 do not shift to the extent that they do not overlap each other, and the wiring cable 19 can be suppressed from being cut or damaged.
Moreover, a gasket 15 can be provided at one end of each of the openings 8 and 14 of the lower box 2 and the upper box 3 to seal the lower box 2 and the upper box 3 in a liquid-tight manner. Further, the first pipe body 18 and the second pipe body 22 were connected to the first hole portion 17 and the second hole portion 21 of the seismic isolation pull box 1, respectively, and the wiring cable 19 was inserted therein. Therefore, the wiring cable 19 is not exposed to the outside, and foreign matter such as insects can be protected from invading or being tampered with, and safety can be enhanced. Further, even if rainwater invades between the foundation 4 of the ground G and the base 11 of the building 10 in the event of a torrential rain or a typhoon, it is possible to prevent the wiring cable 19 from coming into contact with the rainwater.

The present invention is not limited to the seismic isolation pull box 1 according to the above-described embodiment, and appropriate modifications and replacements can be made without departing from the gist of the present invention. included. Hereinafter, modifications of the present invention and the like will be described, but the same reference numerals will be used for the same or similar parts and members as those in the above-described embodiment, and the description thereof will be omitted.

For example, in the seismic isolation pull box 1 according to the above-described embodiment, the first hole portion 17 for connecting the first pipe body 18 is provided on one side surface 7a of the lower box 2, and the side surface 13c on the opposite side of the upper box 3 is provided. A second hole 21 for connecting the second pipe body 22 was provided, and the wiring cable 19 was inserted therethrough. However, the arrangement of the first hole 17 of the lower box 2 connecting the first tube 18 and the second hole 21 of the upper box 3 connecting the second tube 22 is arbitrary side surfaces 7a to 7d and side surfaces 13a to 13a. Any of 13d can be selected. For example, the first pipe body 18 and the second pipe body 22 may be connected to the side surfaces 7a to 7d and the side surfaces 13a to 13d so as to be orthogonal to each other, or may be connected to the side surfaces 7a to 7d and the side surfaces 13a to 13d on the same side. You may.
Further, the lower box 2 and the upper box 3 of the seismic isolation pull box 1 are not limited to a rectangular parallelepiped box shape, and an appropriate shape such as a cylindrical shape or a polygonal tubular shape can be adopted.

In the above-described embodiment, the first pipe body 18 and the second pipe body 22 are provided outside the seismic isolation pull box 1, and the wiring cable 19 is also covered outside the seismic isolation pull box 1. It is not necessary to cover the wiring cable 19 provided outside the seismic pull box 1 with the first pipe body 18 and the second pipe body 22 such as a metal pipe.
Further, a plurality of seismic isolation pull boxes 1 may be arranged on the seismic isolation layer 5 on the foundation 4, and a plurality of wiring cables 19 may be connected between the manhole and the building 10.
In the present invention, the lower box 2 is included in the first box and the upper box 3 is included in the second box.

1 Seismic isolation pull box 2 Lower box 3 Upper box 4 Foundation 7a, 7b, 7c, 7d, 13a, 13b, 13c, 13d Sides 8, 14 Opening 10 Building 11 Base 12 Top surface 15 Gasket 17 First hole 18 First pipe Body 19 Wiring cable 21 Second hole 22 Second pipe 24 Suspended support G Ground

Claims (4)

A first box that is fixed to the ground side and has a first hole for inserting a wiring cable,
A second box fixed to the building side and arranged to face the first box and having a second hole through which the wiring cable is inserted, and a second box.
The wiring cable is housed in the internal space formed by the first box and the second box with an extra length portion, and the first box and the second box are relatively vibrable. A seismic isolation pull box featuring that. The seismic isolation pull box according to claim 1, wherein a suspension support portion for suspending and supporting the wiring cable is provided in the second box so as to face the second hole portion. The seismic isolation pull box according to claim 1 or 2, wherein a sealing member is provided at an end of an opening to which the first box and the second box abut. Any of claims 1 to 3 in which the first pipe body through which the wiring cable is inserted is connected to the first hole portion, and the second pipe body through which the wiring cable is inserted is connected to the second hole portion. The seismic isolation pull box described in item 1.

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