JP4323908B2 - Cable pull-in structure for base-isolated buildings - Google Patents

Description

  The present invention relates to a cable lead-in structure for a base-isolated building. More particularly, the present invention relates to a cable pull-in structure for a base-isolated building for drawing a cable from the outside to the base-isolated building while eliminating disconnection.

  FIG. 8 shows a conventional cable (communication and power) lead-in structure. The lead-in structure 100 is configured to directly connect the cable 101 to the building outer wall 103 with a locking metal fitting 102 so that the cable 101 is stretched between a telephone pole (not shown) and a building.

  However, such a conventional cable lead-in structure has a problem that a large tension may be applied to the cable 101 when the building is displaced due to an earthquake or the like, particularly in a base-isolated building, resulting in disconnection. Therefore, as shown in FIG. 9, a method is employed in which a hollow pole 201 is erected on the ground and the cable 101 is drawn into the building 202 from the inside through the ground.

  In this case, as shown in the figure, it is possible to avoid the disconnection caused by the displacement of the base-isolated building by taking the extra length portion 203 in the cable 101 on the building side. However, with this configuration, there is a problem that it is necessary to construct a work for standing the pole and a burying work for burying the cable in the ground, and the man-hours and costs are greatly increased. In particular, the burial work for burying cables in the ground has a problem that the construction may be difficult depending on the situation of the surface installation and the maintenance is not easy.

  The present invention has been made in view of the problems of the prior art, and provides a cable pull-in structure for a seismic isolation building that is easy to construct and maintain and can prevent disconnection when an earthquake occurs. It is aimed.

The second form of the cable pull-in structure of the seismic isolation building of the present invention is a cable pull-in structure of the seismic isolation building,
An anchor member detachably attached to the building outer wall for securing the cable to the building, and a latch mechanism for detachably attaching the anchor member to the building outer wall,
A shaft portion of the anchor member having a head portion connected to the cable is fitted into a latch hole of the latch mechanism, and the latch mechanism is configured so that, when an earthquake occurs, the anchor member has a shaft portion corresponding to an earthquake detection signal from a sensor. Works to unpin,
In addition, a retractable holding mechanism that holds the cable routed from the locking position into the building,
The holding mechanism has a stretchable part to which a head part of the anchor member is attached, a support part that supports the stretchable part, and a base part that is connected to the support part and fixed to a building,
The support portion is arranged so that the expansion / contraction direction of the expansion / contraction portion is normally parallel to the building wall surface, and when the anchor member is detached from the building outer wall at the time of an earthquake, the base portion is perpendicular to the building outer wall. It is characterized by being attached so as to be displaceable.

  In the second embodiment of the cable pull-in structure for the seismic isolation building of the present invention, the extendable holding mechanism is, for example, a pantograph mechanism.

  Therefore, the cable lead-in structure of the present invention is provided in a seismic isolation building.

  According to the present invention, since the length of the cable can be adjusted within a predetermined range even when the base-isolated building is displaced, an excellent effect of preventing disconnection can be obtained.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
FIG. 1 is a sectional view showing a cable pulling structure for a base-isolated building according to Embodiment 1 of the present invention.

As shown in the figure, this pull-in structure K is a pull-in structure for pulling the communication or power cable 1 from the outside into the seismic isolation building, and the cable 1 is not shown in its entirety with a predetermined tension. The anchor member 3 for locking to the outer wall 2 of the base-isolated building and the length of the routing portion 1a of the cable 1 routed from the locking position by the anchor member 3 to the inside of the building outer wall 2 are variable. A cable holding mechanism 4 that holds the cable 1 so that it can be pulled out and pulled out is provided as a main component.

  In addition, in the same figure, the member to which the code | symbol 5 was attached | subjected is a connection member generally used when an electric power company connects electric wires mutually.

  FIG. 2 shows an attachment structure for attaching the anchor member 3 to the building outer wall 2. The attachment structure L is attached to the building outer wall 2 in such a manner that the anchor member 3 is detached from the building outer wall 2 when an earthquake occurs so that the cable 1 is not broken due to the displacement of the base-isolated building.

  Specifically, the mounting structure L fixes the seismic device 11 that outputs an earthquake detection signal when an earthquake having a predetermined seismic intensity or more is detected, and the anchor member 3 is normally fixed to the building outer wall 2 while an earthquake occurs. A latch mechanism 12 that operates to release the anchor member 3 in response to an earthquake detection signal from the seismic sensor 11 is provided.

  The anchor member 3 includes an annular head portion 3a to which the cable 1 is connected, a shaft portion 3b that is fitted in the latch hole 12a of the latch mechanism 12, and an engagement member that is formed at the tip of the shaft portion 3b and engages with the latch mechanism 12. A shaft end portion 3d having a joint hole 3c.

  FIG. 3 shows details of the cable holding mechanism 4. The cable holding mechanism 4 has a spiral spring 4a and an accommodating cover 4b that accommodates the spiral spring 4a. The cable holding mechanism 4 holds the cable 1 on the wire 4c connected to the tip of the spiral spring 4a, and pulls out the routing portion 1a in the event of an earthquake. It is comprised so that pick-up can be performed.

  Further, even when the anchor member 3 is detached from the building outer wall 2 by this configuration, the tension due to the weight of the cable 1 is not directly transmitted to the building side.

  FIG. 4 shows the operation of the retracting structure K when an earthquake occurs. FIG. 2A shows a state immediately after the latch mechanism 12 is activated and the anchor member 3 is detached from the building outer wall 2 when an earthquake occurs. FIG. 2B shows a state in which the routing portion 1 a is pulled out with the aid of the cable holding mechanism 4 due to the tension of the cable 1.

  As described above, the pull-in structure K of the first embodiment is achieved by the latch mechanism 12 having the seismic device 11 so that the anchor member 3 for securing the cable 1 to the building outer wall 2 can be detached from the building outer wall 2 when an earthquake occurs. A cable holding mechanism 4 for unwinding and winding the wire 4c, which is attached to the outer wall 2 of the building and holds the routing portion 1a of the cable 1 in a freely drawable and retractable manner according to the tension acting on the cable 1. Is provided.

  As a result, when the seismic isolation building is displaced and the tension of the cable 1 increases when an earthquake occurs, the anchor member 3 is detached from the building outer wall 2 and the routing portion 1a of the cable 1 is wound around the wire 4c of the cable holding mechanism 4. The cable length is adjusted by being subsidized and pulled out by the drawing operation, thereby preventing the cable 1 from being disconnected.

  Further, when the cable 1 is to be secured to the building outer wall 2 again, the cable 1 can be easily restored simply by fitting the shaft portion 3 b of the anchor member 3 into the latch hole 12 a of the latch mechanism 12.

  Therefore, as compared with the case where the cable 1 is buried in the ground, the cable 1 can be pulled in to prevent disconnection due to an earthquake with much simpler construction, and the maintenance should be made much easier. Is possible.

Embodiment 2
Hereinafter, the lead-in structure according to the second embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 5, the lead-in structure K1 of the second embodiment is obtained by modifying the lead-in structure K of the first embodiment. Here, instead of the cable holding mechanism 4, the cable length is adjusted within a predetermined range. Thus, a pantograph mechanism (stretchable holding mechanism) 21 that expands and contracts in a pantograph manner is provided. The remaining structure of the pull-in structure K1 is the same as that of the first embodiment.

  As shown in FIG. 6, the pantograph mechanism 21 includes an extendable portion 21 a, a support portion 21 b that supports the expandable portion 21 a, and a base portion 21 c that is connected to the support portion 21 b and is fixed to the building. .

  The head portion 3a of the anchor member 3 is attached to the distal end of the stretchable portion 21a. The support portion 21b is configured so that the expansion / contraction direction of the expansion / contraction portion 21a is parallel to the building wall surface at normal times (see FIG. 6A), while the anchor member 3 is detached from the building outer wall 2 when an earthquake occurs. It is attached so that it can be displaced by 90 degrees with respect to the base portion 21c so as to be perpendicular to the wall surface (see FIG. 6B).

  FIG. 7 shows the operation of the pull-in structure K1 when an earthquake occurs. As shown in the figure, when the latch mechanism 12 is actuated, the anchor member 3 is detached from the building outer wall 2, and accordingly, the support portion 21b is attached to the base portion 21c so that the extension / contraction direction of the extension / contraction portion 21a is perpendicular to the building wall surface. It rotates 90 degrees with respect to it, and the expansion-contraction part 21a expands and contracts in the range which does not affect the connection location of the cable 1 inside a building.

  Therefore, the length of the cable 1 can be adjusted within a predetermined range even when the base-isolated building is displaced at the time of the occurrence of the earthquake, so that disconnection can be prevented.

  The present invention can be applied to cable pull-in of seismic isolation buildings.

It is a partial cross section figure which shows the cable drawing-in structure of the seismic isolation building which concerns on Embodiment 1 of this invention.

It is a figure which shows typically the attachment structure of the anchor member as a securing member in the structure.

It is a figure which shows the structure of a cable holding mechanism typically.

It is a figure which shows typically operation | movement of the cable drawing-in structure of Embodiment 1. FIG.

It is a partial cross section figure which shows the cable drawing-in structure of the seismic isolation building which concerns on Embodiment 2 of this invention.

It is a figure which shows the principal part detail of the structure.

It is a figure which shows typically operation | movement of the cable drawing-in structure of Embodiment 2. FIG.

It is a partial cross section figure showing an example of the conventional cable lead-in structure.

It is a fragmentary sectional view which shows another example of the conventional cable drawing-in structure.

Explanation of symbols

K, K1 Cable lead-in structure 1 Cable 2 Building 3 Anchor member 4 Cable holding mechanism 12 Latch mechanism 21 Pantograph mechanism

Claims (3)

A cable lead-in structure for a base-isolated building,
An anchor member detachably attached to the building outer wall for securing the cable to the building, and a latch mechanism for detachably attaching the anchor member to the building outer wall,
A shaft portion of the anchor member having a head portion connected to the cable is fitted into a latch hole of the latch mechanism, and the latch mechanism is configured so that, when an earthquake occurs, the anchor member has a shaft portion corresponding to an earthquake detection signal from a sensor. Works to unpin,
In addition, a retractable holding mechanism that holds the cable routed from the locking position into the building,
The holding mechanism has a stretchable part to which a head part of the anchor member is attached, a support part that supports the stretchable part, and a base part that is connected to the support part and fixed to a building,
The support portion is arranged so that the expansion / contraction direction of the expansion / contraction portion is normally parallel to the building wall surface, and when the anchor member is detached from the building outer wall at the time of an earthquake, the base portion is perpendicular to the building outer wall. A cable lead-in structure for a seismically isolated building, characterized in that it is mounted so that it can be displaced. The telescopic holding mechanism, pull building isolation cable of claim 1, wherein the formed by a pantograph mechanism structure. A base-isolated building comprising the cable lead-in structure according to claim 1 or 2 .

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