JPH04105647U - Seismic isolation support device for structures - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent structures from being damaged by impact forces such as earthquakes. [Structure] A seismic isolation device 5 made of an elastic body such as a spring is disposed between the structure 1 and the support 2, and when the seismic isolation device 5 is compressed, the seismic isolation device 5 is installed between the structure 1 and the support 2. A restraining device 13 is disposed to restrain the elastic force of the seismic isolation device 5 and release the restrained elastic force of the seismic isolation device 5 by applying an impact force greater than required.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a seismic isolation support device for a structure.

0002

[Conventional technology]

For example, as shown in Figure 5, offshore work platforms such as oil drilling bases that perform work on the ocean Structure a is equipped with various types of machinery such as cranes, boring equipment, and pile drivers. In order to work safely using them, it is necessary to ensure that the structure a It needs to be fixed.

0003 Therefore, the structure a has its own floating structure with respect to the support b that penetrates into the seabed and is fixed. The required amount is sunk from the sea surface c using cylinders, winches, etc. against the force. It is used to restrain the body by supporting the body in a stable manner.

0004

[Problem that the idea aims to solve]

However, if structure a is supported in a restrained state as described above, for example, When an earthquake occurs, the vibrations of the seabed are transmitted to the structures on the sea surface via supports b fixed to the seabed. It will be transmitted directly to creation a.

[0005] On the other hand, the speed at which vibrations from the seabed are transmitted to seawater is slow, so structures on the sea There is a large difference between the vibrations of structures a and support b and the vibrations of the seawater, which causes It is said that a large load will be applied to structure a and support b, damaging structure a and support b. I had a problem.

[0006] In addition, in an attempt to solve this problem, a seismic isolation device was installed between support body b and structure a. However, if a seismic isolation device is installed, heavy objects such as machinery can be Installation may cause problems such as structure a tilting or shaking due to waves, and the structure It becomes impossible to reliably support object a.

[0007] In addition, when supporting a structure on the ground with a support, the structure and support It has been considered to interpose a seismic isolation device using an elastic body such as a spring between the Under normal conditions, when a heavy object is mounted on a structure, the elastic force of the seismic isolation device In actual use, the structure may tilt or shake vertically or horizontally. It has various problems.

[0008] This invention was devised in view of the above-mentioned circumstances. For the purpose of providing a seismic isolation support device for structures that can prevent objects from being damaged. There is.

[0009]

[Means to solve the problem]

The present invention supports a structure on a support via a seismic isolation device made of an elastic body, and The seismic isolation device is restrained in a compressed state between the structure and the support, and the necessary A structure comprising a restraint device that releases the restraint by an impact force of This is related to the seismic isolation support device.

0010

[Effect]

For example, when a required impact force is applied to the structure and support due to an earthquake, the The restraining force of the restraint device that restrains the elastic force of the seismic device is released, and the seismic isolation device The structural force is used to support the structure, and the impact force of the earthquake causes the structure to be supported. And the support can be prevented from being damaged.

[0011]

【Example】

Embodiments of the present invention will be described below based on the drawings.

0012 1 to 3 show an embodiment of the present invention.

[0013] 1 in Figure 1 is a structure such as an offshore workbench, and a predetermined position of the structure 1 is a seabed. A space 3 into which the top of the support 2 fixed to the support body 2 can be inserted is provided. section has been inserted.

[0014] The structure 1 is provided with a protrusion 4 that protrudes vertically downward into the space 3.

[0015] A seismic isolation device 5 made of an elastic body such as a spring is arranged between the support body 2 and the protrusion 4. A winch 7 and a winch 7 disposed at a predetermined position in the space 3 of the structure 1 and a protrusion 4 The attached pulley 6 has one end fixed to the support 2, and the other end is connected to the wheel via the pulley 6. A restraining drive device 9 is constituted by the rope 8 wound around the punch 7.

[0016] Furthermore, between the protrusion 4 and the support body 2, there is a vertically downward direction from a predetermined position of the protrusion 4. A member 10 protruding a required length and extending a required length from the support body 2 toward the member 10. A member 11 is provided between each member 10 and 11. Normally, the seismic isolation member 11 is The elastic force of the device 5 is restrained, and an impact force larger than necessary is applied to the support 2 or the structure 1. A restraint 13 having, for example, a notch 12 so as to break when applied to the bolt 18 It is attached by tightening etc. This restraint 13 can be installed by welding, etc. You can go there.

[0017] Normally, a structure 1 such as a marine workbench has a support 2 and a protrusion 4 as shown in FIG. The elastic force of the seismic isolation device 5 disposed between is supported while being restrained by the restraint device 13. has been done.

[0018] That is, the winch 7 of the restraining drive device 9 is driven to wind in the rope 8. this Since the support body 2 is fixed, the structure 1 can resist the elastic force and buoyancy force of the seismic isolation device 5. and is pulled down in the direction of the arrow in FIG.

[0019] After lowering the structure 1 by a required amount, the structure 1 is broken by applying a required impact force in advance. The restraint device 13 configured to wear.

[0020] After installing the restraint 13, the winch 7 is rewinded appropriately and the rope 8 is set free. do.

[0021] In this way, the elastic force of the seismic isolation device 5 is restrained by the restraint device 13, and normally During this time, the structure 1 remains reliably supported.

[0022] In the above state, an earthquake or the like occurs and an impact force greater than necessary is applied to the support 2 or the structure. When the restraint 13 breaks from the notch 12 when acting on the object 1, the bullet of the seismic isolation device 5 The restraining force that restrained the force is released, and the seismic isolation device 5 is attached to the support 2 or the structure 4. It expands and contracts in response to the impact force transmitted from the structure, and supports the structure 1 with its elastic force. Ru.

[0023] Therefore, the impact force transmitted to the structure 1 is relaxed and the structure 1 and the support 2 are damaged. can be prevented.

[0024] FIG. 4 shows another embodiment of the present invention, which differs from the embodiment described above except for the structure of the restraint device 14. It has exactly the same configuration as shown in .

[0025] The restraint device 14 has a distal end rotatably attached to the member 10 via a pin 15. The arm 16 engages with an engaging portion 17a formed on the tip of the arm 16 on the member 11. The engagement portion 17b is provided so that the engagement portion 17b can be engaged with the member 11, and the engagement portion 17b is provided between the member 11 and the arm 16. A compression spring 19 that always presses the arm 16 in the direction of disengaging the engaging portions 17a and 17b. It is composed of.

[0026] Under normal conditions, the engaging portion 17a of the arm 16 engages with the engaging portion 17b. The structure 1 is supported by restraining the elastic force of the seismic isolation device 5.

[0027] The arm 16 may be affected by an impact force greater than necessary, especially vibration in the vertical direction, due to an earthquake or the like. When the engagement between the engaging portions 17a and 17b becomes weaker, the elastic force of the compression spring 19 The arm 16 rotates in the direction of the arrow, and the restraining force restraining the elastic force of the seismic isolation device 5 is released. be done.

[0028] As a result, the structure 1 is elastically supported by the seismic isolation device 5, similar to the above-described embodiment. will be done.

[0029] Furthermore, although the restraint device 13 shown in FIGS. 1 to 3 cannot be reused, the restraint device 13 shown in FIG. The restraint 14 is reusable.

[0030] Note that the seismic isolation support device for structures of the present invention is not limited to the above-mentioned embodiments. In the examples, the structure is an offshore work platform, but Applicable to all structures, including those on the ground, and capable of absorbing impact forces from earthquakes However, it is possible to respond to all kinds of impact forces, and other aspects that deviate from the gist of the invention Of course, various changes can be made within the scope.

[0031]

[Effect of the idea]

As explained above, according to the seismic isolation support device for structures of the present invention, under normal conditions The structure is restrained to the support by a tool, and the impact force exceeding the specified value is applied to the support or the structure. When the earthquake occurs, the restraints by the restraints are released and the structure is supported by the seismic isolation device. This allows stable work to be carried out on fixed structures during normal times. It also prevents structures and supports from being damaged when impact forces occur due to earthquakes, etc. It can produce excellent effects.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view showing the restraint shown in FIG. 1 in a broken state.

FIG. 3 is a front view showing a detailed example of the restraint.

FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 5 is a front view showing a state in which the structure is supported by a support body.

[Explanation of symbols]

1 Structure 2 Support 5 Seismic isolation device 13,14 Restraints

Claims (1)

[Scope of utility model registration request] Claim 1: A structure is supported on a support via a seismic isolation device made of an elastic body, and the seismic isolation device is restrained in a compressed state between the structure and the support, and a A seismic isolation support device for a structure, comprising a restraint device that releases the restraint by an impact force.