JPH05184039A - Cable supporting structure - Google Patents

Abstract

PURPOSE:To improve the vibration resisting property of a cable by a method wherein bending load or tension load, applied on the cable, is absorbed by a displacement generated between a vibration proofing floor and a fixed floor upon earthquake. CONSTITUTION:A cable, connected to a computer or a board 2 installed on an free-access floor 3 supported from a fixed floor 4 through a vibration proofing device 1, is wired through the free-access floor 3, a cable fixing point 6 and a cable supporting device 7. According to this method, the cable between the computer or the board 2 and the cable fixing point 6 effects the same behavior as the free-access floor 3 upon earthquake and the cable between the fixed floor 4 and the other devices after the fixed floor 4 effects the same behavior as the fixed floor 4 whereby a relative motion between the free-access floor 3 and the fixed floor 4 can be absorbed by one set of cable supporting device 7. Accordingly, the vibration resisting property of the cable can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suitable cable support structure for absorbing a load generated when a cable vibrates and improving the seismic resistance of the cable.

[0002]

2. Description of the Related Art As a means for reducing the load applied to a structure during an earthquake, there is support using a seismic isolation device composed of laminated rubber, springs, dampers and the like. With this seismic isolation support, it is possible to absorb the load generated during an earthquake by greatly deforming the seismic isolation device, and reduce the seismic load applied to the structure supported by the seismic isolation device.

When a computer or a board is installed on the floor supported by the seismic isolation support device, one end of a cable connecting the computer or the board and a device installed at another part cut off from the floor The other end is supported by a seismically isolated floor, and the other end is supported by a device on a fixed floor where seismic isolation support devices are not installed. The seismically isolated floor has the characteristic of absorbing the load at the time of the earthquake due to the large deformation of the seismic isolation device itself as described above, so that the relative motion to the fixed floor is excited at the time of the earthquake. As a result, as shown in the conventional cable supporting method of FIG. 1, the computer or the panel 2 and the free access floor 3 are alternately displaced with respect to the fixed floor 4 due to the alternating deformation of the seismic isolation device 1. , The cable 5 connected to a device that is pulled out from the bottom of the computer or the panel 2 and installed on another fixed floor is the cable 5
Bending or pulling force is generated depending on the laying condition of
Sliding with the fixed floor 4 occurs. In order to avoid the bending or pulling force generated in the cable 5, it is conceivable that the cable 5 has a predetermined slack on the fixed floor 4 and this slack absorbs the displacement generated during an earthquake. Alternatively, the cable 5 also moves in an alternating manner following the alternating movement of the board 2 and the free access floor 3, and the fixed floor 4
The sliding material causes the coating material of the cable 5 to be worn during repeated earthquakes, resulting in an accident such as disconnection, short circuit or ground fault.

On the other hand, in order to avoid the sliding that occurs between the cable 5 and the fixed floor 4, the cable 5 extending between the cable 5 pull-out point of the computer or the panel 2 and the device installed on another fixed floor. It is conceivable to extend and support the cable so that it passes through the air. In this method, the relative displacement of the computer or the panel 2 and the free access floor 3 with respect to the fixed floor 4 acts on the cable 5 as a bending or pulling force. This will cause an accident that the cable 5 breaks.

As described above, according to the prior art, the viewpoint of the soundness of the cable during the earthquake against the relative displacement during the earthquake or the alternating movement caused by the seismic isolation device installed for the purpose of enhancing the soundness of the computer or the panel during the earthquake. No special measures have been taken by

An invention relating to a cable support structure that absorbs expansion and contraction of a power cable and prevents damage to the cable is disclosed in JP-A-57-122619 and JP-A-57-1262.
There is publication 22.

The former invention is characterized in that the expansion and contraction of the power cable is absorbed by the change of the loop diameter accompanied by the diameter reduction and expansion of the cone of the link arm. No mention is made of the wear of the cable jacket caused by sliding on the floor.

The latter invention is characterized in that the cable receiving member and the connecting rod do not exceed the minimum allowable radius of the cable when the cable contracts. However, when the cable contracts and the loop diameter decreases, No action has been taken to return to the installed state, and if a further load is applied with the loop diameter being reduced, this load will be borne by the proof stress that resists the pulling force of the cable itself. ..

[0009]

The computer or board is
It is transmitted by the functional cable of its own, and both are sound and the required functions are satisfied.

In recent years, in power plants and other industrial facilities, the importance of computers and panels for measuring and controlling plant conditions has become even more important. In particular, in order to ensure soundness during an earthquake, inertial force during an earthquake There is a tendency to install computers or panels on the floor supported by seismic isolation devices that can significantly reduce the load generated by the earthquake. While this seismic isolated support floor can reduce the seismic inertial force, it excites a large relative motion with the fixed floor, so the load during an earthquake caused by the relative motion generated in the cable between both floors was considered. Need to be designed.

An object of the present invention is to provide a support structure excellent in seismic resistance for a computer installed on a seismic isolated floor or a cable of a board which can significantly reduce the load due to inertial force during an earthquake. is there.

[0012]

In order to achieve the above object, from the viewpoint of avoiding sliding with a fixed floor, a supporting system in which a cable is installed imaginarily is adopted. Also, as a structure that absorbs relative displacement during an earthquake, a method of absorbing the load by reducing the diameter of the elastic material on the loop, a cable with slack is embedded in the granular resistance material, and the load is absorbed by moving the resistance material. Method, a method of absorbing the load by stretching the elastic material that connects the two points of the cable, a method of wiring the cable so as to sew between the plurality of elastic rods and absorbing the load by bending deformation of the elastic rods, or the surroundings. Any means of absorbing the load by compressing the gas contained in the air cylinder in which the cable is routed is used, and the aerial support method is used in combination.

[0013]

According to the conventional technique, the cable connected to the computer or the panel supported on the seismic isolated floor is directly laid on the fixed floor, and the cable is moved by the relative motion generated between the seismic isolated floor and the fixed floor during an earthquake. The result is that an excessive load is applied to.

The present invention solves the problem that the sliding of the cable and the fixed floor wears and damages the cable by supporting the cable in an imaginary manner. Further, in order to absorb the bending or tensile load applied to the cable due to the relative displacement, the cable is supported by the elastic material in combination with the aerial support. The support method using this elastic material includes a structure in which a cable is laid around a loop-shaped elastic material that can be reduced in diameter, a structure in which two points of a cable with slack are connected by an elastic material, and a plurality of elastic materials are used. There is a structure where cables are routed so as to meet between the rods, whichever structure is used, the elastic material absorbs bending or tensile loads applied to the cables and can follow repeated earthquake loads. In addition, when the earthquake event ends, it returns to the initial setting position, so that a stable load absorption effect can be obtained even if multiple earthquakes are encountered.

Further, due to the structure in which the cable connected and supported by the elastic material is installed in the container filled with the granular resistance material, the granular resistance material is moved into the container by the cable displaced by the load at the time of the earthquake, and the further load is applied. The absorption effect can be achieved.

The load absorbing effect similar to that of the elastic material, the ability to follow a repeated load, and the return to the initial state can be achieved by using an air cylinder filled with gas, and the circumference of the air cylinder is formed into a loop shape. The purpose can be achieved by a structure in which the cable is routed and the diameter of the cable loop compresses the cylinder.

In the present invention, the amount of relative displacement between the base-isolated floor and the fixed floor at the time of an expected earthquake is calculated by seismic response analysis, so that an elastic material sufficient to absorb this relative displacement is obtained. It is possible to adjust the rigidity or the amount of gas enclosed, and it is possible to provide a rational cable support structure.

[0018]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 2 is a diagram showing an installation example of a cable according to the present invention. A computer or panel 2 installed on a free access floor 3 supported by a seismic isolation device 1 from a fixed floor 4.
The cable 5 to be connected to is connected to the free access floor 3 and the fixed floor 4 via cable fixing points 6 installed on each of them and a cable supporting device 7 installed between the cable fixing points 6. By arranging the cable 5 in this way, the cable between the computer or the panel 2 and the cable fixing point 6 installed on the free access floor 3 behaves in the same manner as the free access floor 3 at the time of the earthquake, and the fixed floor 4 and later. The cable between the other devices of the above will behave the same as the fixed floor 4,
The relative movement between the free access floor 3 and the fixed floor 4 can be absorbed by one cable support device 7.

FIG. 3 is a view showing an embodiment of a cable supporting structure using a loop-shaped elastic material according to the present invention. The elastic material 8 formed in a loop shape is polymerized at both ends, and the cable 5 is installed around the concave cross-sectional shape.
When a tensile force is applied to the elastic material 8, the diameter of the elastic material 8 is reduced while sliding at both ends, so that the tensile force can be absorbed by the friction due to the sliding of the elastic material and the deformation due to the diameter reduction.
In addition, the loop-shaped elastic member 8 has a structure in which abrasion due to sliding between the cable 5 and the fixed floor 4 at the time of an earthquake can be avoided by suspending the loop-shaped elastic member 8 on a rod 10 installed between the opposite side surfaces of the cable supporting device 7. is there. Furthermore, when the earthquake event ends, the elastic member 8 having a reduced diameter restores automatically to the initial set position.

FIG. 4 is a diagram showing an embodiment of a cable supporting structure using the container containing the resistance material according to the present invention. The cable supporting device 7 having the function of a container is provided with the cable 5 which is connected between the two points with the elastic material 8 and has a slack between the two points, and the gap is filled with the granular resistance material 11. When a tensile force acts on the cable 5, the elastic material 8 expands and the shape of the slack of the cable 5 changes, so that the granular resistance material 1
Since 1 moves in the cable supporting device 7, the tensile force can be absorbed by the expansion of the elastic material 8 and the friction between the granular resistance materials 11, and the abrasion due to the sliding of the granular resistance material 11 and the cable 5 can be ignored. It is small, and after the earthquake, the initial set position is automatically returned by the restoring force of the elastic material 8.

FIG. 5 is a diagram showing an embodiment of a cable support structure using a linear elastic material according to the present invention. Two points of the slackened cable 5 are supported by a cable support 19 and an elastic member 8 connecting the cable support 19, and the cable support 19 is fixed to a fixed floor with bolts 16. At this time, one of the cable supporting members 19 is provided with a slide hole 15 so that the cable supporting member 19 can freely slide in the axial direction of the cable 5 with respect to the tensile force transmitted through the cable 5. Can be absorbed by stretching the elastic material 8. In this embodiment, since the cable 5 is imaginarily supported, sliding on the fixed floor does not occur, and after the earthquake, the elastic member 8 automatically returns to the initial set position due to the restoring force.

FIG. 6 is a diagram showing an embodiment of a cable support structure using an elastic rod according to the present invention. The hooks 13 are attached to the plurality of elastic rods 12 fixed to the fixed floor, and the hooks 1
3 supports the cable 5. At this time, since the cable 5 is installed so as to sew the plurality of elastic rods 12, the cable 5
When a tensile force is applied to the elastic rod 12, a bending force is applied to the elastic rod 12 as the cable 5 tries to be linear, and the tensile force of the cable 5 can be absorbed by the bending deformation of the elastic rod 12. In this embodiment, since the cable 5 is supported imaginarily, no sliding with the fixed floor occurs, and after the earthquake, the elastic rod 12 automatically returns to the initial set position by the restoring force.

FIG. 7 is a diagram showing an embodiment of a cable support structure using an air cylinder according to the present invention. Fixed bed 4
The gas 18 is enclosed in a cylinder 17 fixed by a bolt 16 to the cylinder 17, a pulley 20 is attached to the cylinder 17, and the cable 5 is installed around the pulley 20. Since the tensile force acting on the cable 5 compresses the gas 18 in the cylinder 17 via the pulley 20, the tensile force can be absorbed by this compression effect. Also in this embodiment, since the cable 5 is imaginarily supported, sliding with the fixed floor 4 does not occur, and after the earthquake, the compressed gas 18 expands to automatically return to the initial set position.

FIG. 8 is a diagram showing an embodiment of a cable support structure using a spring according to the present invention. One of the cable supporting members 19 that has the slack and supports the cable 5 is the bolt 1
6 is fixed to the fixed floor, and the other one of the cable supports 19 is provided with a slide hole 15 so as to be freely slidable in the axial direction of the cable 5. The other end of the spring 14 whose one end is fixed to the fixed floor is joined to the side of the slidable cable support 19, and the pulling force acting on the cable 5 is transmitted to the spring 14 by the sliding of the cable support 19. 14
It can be absorbed by deformation. Also in this embodiment, since the cable 5 is imaginarily supported, sliding with the fixed floor does not occur, and after the earthquake, it is possible to automatically return to the initial set position by the restoring force of the spring 14.

[0026]

By using the cable support structure according to the present invention, the bending or tensile load applied to the cable by the displacement generated by the relative motion between the base isolation floor and the fixed floor during an earthquake is effectively absorbed, and It is possible to avoid the abrasion of the cable caused by the sliding of the fixed floor, and it is possible to realize suitable seismic resistance of the cable.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a cable installation example according to a conventional technique.

FIG. 2 is an explanatory view of an installation example of a cable according to the present invention.

FIG. 3 is a perspective view of an example of a cable support structure using a loop-shaped elastic material.

FIG. 4 is a perspective view of an example of a cable support structure using a container containing a resistance material.

FIG. 5 is a perspective view of an example of a cable support structure using a linear elastic material.

FIG. 6 is a perspective view of an example of a cable support structure using elastic rods.

FIG. 7 is a side view of an example of a cable support structure using an air cylinder.

FIG. 8 is a perspective view of an example of a cable support structure using springs.

[Explanation of symbols]

1 ... Seismic isolation device, 2 ... Computer or board, 3 ... Alley access floor, 4 ... Fixed floor, 6 ... Cable fixing point, 7 ... Cable support device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Gyotoku, 3-2-1, Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Engineering Co., Ltd. No. 1 within Hitachi Engineering Co., Ltd.

Claims (5)

[Claims] 1. A computer or panel installed on a floor supported by a seismic isolation device, which is composed of laminated rubber, springs, dampers, etc., and has the function of absorbing energy during vibration by its own deformation. And a cable that connects a device installed at another portion that is cut off from the floor supported by the seismic isolation device, the cable is supported by an elastic material having a sliding surface, and occurs in the cable during vibration A cable support structure that absorbs a load by friction of a sliding surface and deformation of an elastic material. 2. The cable support structure according to claim 1, wherein two points of the cable are connected by an elastic material, and the elastic cable is supported in a granular resistance material which can easily follow deformation. 3. The cable support structure according to claim 1, wherein the two points of the cable are supported by a material having elastic behavior against a load in the tensile direction. 4. The cable support structure according to claim 1, wherein the cable is sewn between a plurality of rods and a tensile load generated in the cable is absorbed by bending deformation of the rods. 5. The cable support structure according to claim 1, wherein the cable is arranged around an apparatus provided with an air cylinder, and a tensile load generated in the cable is absorbed by compression of gas in the cylinder.