JP2016084602A - Air levitation type seismic isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air levitation type seismic isolation device capable of improving durability of an expansion pipe.SOLUTION: An air levitation type seismic isolation device comprises: a foundation consisting of an upper foundation plate and a lower foundation plate; a groove, which is formed on a bottom face of the upper foundation plate and partitions the space between the upper foundation plate and the lower foundation plate into multiple air pressure rooms; an expansion pipe buried in the groove, which expands by being supplied with air to block a surrounding section in a horizontal direction of the air pressure room; a protector, which is formed on an outer surface of the expansion pipe and made from harder material than the expansion pipe, contacts to a top face of the lower foundation plate and extends in a longer direction of the expansion pipe; and an air injection valve, which is formed on the upper foundation plate and allows air to be injected into the air pressure room when air injection holes formed on side faces of an inner cylinder and an outer cylinder match and stops air to be injected when the upper foundation plate floats up and the air injection holes on the outer cylinder and the inner cylinder are misaligned.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an air levitation type seismic isolation device, and more particularly, an air levitation capable of further improving the sealing degree of a plurality of air pressure chambers formed between an upper foundation and a lower foundation using an expansion pipe. It relates to a seismic isolation device.

  The Applicant has proposed using an expansion tube that is inflated with air to form an air pressure chamber between the upper base plate and the lower base plate. The expansion tube can form a plurality of air pressure chambers between the upper base plate and the lower base plate and seals the periphery. Since the expansion tube is inserted into the groove of the upper base plate provided in advance, it can be attached not only to the outer peripheral portion of the upper base plate but also to the inside. According to this, even if the weight of the building installed on the upper foundation is uneven, the building can be levitated horizontally during an earthquake. (See Patent Document 1)

  FIG. 14 shows an expansion tube of Patent Document 1. The expansion tube 1 is embedded in the groove 2 of the upper base plate 3. In the event of an earthquake, air is sent into the air pressure chamber 5 to levitate the upper base plate 3 and the building. At the same time, air is also sent to the expansion tube 1. The expansion pipe 1 is sealed so that the air in the air pressure chamber 5 does not leak outside. When the lower base plate 4 moves due to the earthquake, the expansion pipe 1 is shaped to slide on the surface of the lower base plate 4, and the shaking of the lower base plate 4 can be prevented from propagating to the upper base plate 3. In FIG. 14, the portion A surrounded by the dotted line of the expansion pipe 1 is preferably made of a hard material because it is damaged or deteriorated due to friction with the lower base plate 4, while the expansion pipe 1 is surrounded by the air pressure chamber 5. There is a need for soft materials that need to be inflated to seal.

US Pat. No. 8,215,062

  An object of the present invention is to provide an air levitation type seismic isolation device capable of improving the durability of an expansion pipe.

  An air levitation type seismic isolation device according to the present invention is formed on a base composed of an upper base plate and a lower base plate, and a bottom surface of the upper base plate, and includes a plurality of air pressure chambers between the upper base plate and the lower base plate. A groove that is embedded in the groove, is expanded by being supplied with air, and closes the periphery of the air pressure chamber in the horizontal direction, and is formed on the outer side of the expansion tube and is harder than the expansion tube. A protector extending in the longitudinal direction of the expansion pipe, and an air injection hole provided on the side surface of the inner cylinder and the outer cylinder, which are in contact with the upper surface of the lower base plate Then, air is injected into the air pressure chamber, and an air injection valve is provided to stop the air injection when the upper base plate floats and the air injection hole of the outer cylinder and the inner cylinder shifts. Be

  The upper surface of the lower base plate is provided with a concrete mirror finish.

  The air injection valve is characterized in that a presser spring for urging the inner cylinder in the direction of the lower base plate is provided on the inner upper side.

  According to the air levitation type seismic isolation device of the present invention, the protector which is harder than the expansion pipe extending in the longitudinal direction is provided outside the expansion pipe, so that it is pressed against the upper surface of the lower base plate by the internal pressure of the expansion pipe in the event of an earthquake. Even if it slides on the base plate, it can be durable without being damaged by friction or heat. In addition, since the air injection valve is provided with air injection holes on the side surfaces of the inner cylinder and the outer cylinder, the inner cylinder can be prevented from being damaged by pressing the lower base plate when injecting air. For example, when an air injection valve such as Patent Document 1 injects air, it is injected so that the upper part of the inner cylinder is pushed downward, so that the rod-shaped bottom of the inner cylinder covers the surface of the lower base plate. The surface of the lower base plate is easily damaged.

  Since the upper surface of the lower base plate is mirror-finished with concrete, there is no unevenness on the surface, the protector can easily slide, and air leakage in the air pressure chamber can be prevented well.

  Since the presser spring for urging the inner cylinder in the direction of the lower base plate is provided on the inner upper part of the air injection valve, the inner cylinder can be stably held.

It is a top view of the air levitation type seismic isolation device by this invention. It is AA sectional drawing of FIG. It is a perspective view of an expansion pipe (Example 1). The expansion tube has a square cross section and is provided with a protector at the bottom. It is sectional drawing which embedded the expansion pipe of FIG. 3 in the groove | channel of the upper base plate. FIG. 5 is a cross-sectional view showing a state in which air is injected into the air pressure chamber from the state shown in FIG. 4 to float the upper base plate, and air is injected into the expansion pipe to seal the periphery of the air pressure chamber. It is a perspective view of an expansion pipe (Example 2). The expansion tube has a circular cross section, and a protector is provided at the bottom around the outside. It is sectional drawing which embedded the expansion pipe of FIG. 6 in the groove | channel of the upper base plate. FIG. 8 is a cross-sectional view showing a state in which air is sent from the state shown in FIG. 7 to the air pressure chamber to float the upper base plate, and air is injected into the expansion pipe to seal the periphery of the air pressure chamber. It is a perspective view of an expansion pipe (Example 3). The expansion tube has a square cross section and is provided with a protector at the bottom. FIG. 10 is a cross-sectional view in which the expansion pipe of FIG. 9 is embedded in a groove of the upper base plate. FIG. 10 is a cross-sectional view showing a state in which air is sent to the air pressure chamber from the state shown in FIG. It is a perspective view of the joint for expansion tubes. (A) is an L-shaped joint, (B) is a straight joint, and (c) is a T-shaped joint. It is sectional drawing of an air injection valve. It is explanatory drawing which shows the conventional expansion tube.

  Hereinafter, an air levitation type seismic isolation device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view of an air levitation type seismic isolation device 100 according to the present invention. The foundation plate is composed of an upper foundation plate 3 and a lower foundation plate 4, and a building (not shown) is constructed on the upper foundation plate 3. One or a plurality of air pressure chambers 5 are provided between the upper base plate 3 and the lower base plate 4. By injecting air into the air pressure chamber 5, the upper base plate 3 and the building above it are levitated. Let As a result, even if the ground and the lower foundation plate 4 vibrate in the event of an earthquake, the space between the upper foundation plate 3 and the lower foundation plate 4 is blocked by the air layer of the air pressure chamber 5, so that the vibration is not transmitted to the building. Can be.

  As shown in FIG. 1, four air pressure chambers 5 are partitioned by an expansion pipe 1 in this embodiment. During the earthquake, air is injected into the air pressure chamber 5 surrounded by the expansion pipe 1 by the air injection valve 6. Since the air injection valve 6 continues to inject air until the upper base plate 3 is levitated to a predetermined height, for example, even if the right part of the building is heavy in FIG. Can be the same. Note that air is pressed into the expansion pipe 1 from the air pressure inlet 7.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. This is an example in which the groove 2 is provided in the upper base plate 3. The groove 2 is rectangular in this embodiment, and can be formed by using a mold when pouring concrete. The upper base plate 3 may be divided into several blocks, manufactured at a factory, and simply assembled on site. The air injection valve 6 is fixedly attached to a hole passing through the upper base plate 3 at the center of each air pressure chamber 5. The surface of the lower base plate 4 is polished with a polishing machine to give a mirror finish 21.

  FIG. 3 is a perspective view showing the expansion tube 1 (Example 1). The expansion tube 1 has a substantially square cross section, and a protector 10 is provided at the bottom of the expansion tube 1. The protector 10 is formed integrally with the expansion tube 1. The protector 10 extends in the longitudinal direction of the expansion tube 1. The expansion tube 1 expands by press-fitting air with a soft vinyl chloride tube containing a plasticizer. The protector 10 is made of hard vinyl chloride, and is joined to the outside of the expansion tube 1. The protector 10 is provided with a plurality of slits 20 extending in the longitudinal direction so as to withstand expansion.

  FIG. 4 is a cross-sectional view in which the expansion tube 1 of FIG. 3 is embedded in the groove 2 of the upper base plate 3. In the state of FIG. 4, no air is injected into the expansion tube 1, and no air is injected into the air pressure chamber 5.

  In FIG. 5, air is injected from the state shown in FIG. 4 into the air pressure chamber 5, the upper base plate 3 floats, air is also injected into the expansion pipe 1 and expands, and the periphery of the air pressure chamber 5 is sealed. It is sectional drawing which shows the state. The upper base plate 3 is levitated at the height shown in the lower left of FIG. While the pressure in the air pressure chamber 5 is about 0.1 atm, the pressure inside the expansion tube 1 is 2 to 6 atm, so the bottom of the protector 10 is the upper surface of the lower base plate 4 with the internal pressure of the expansion tube 1. It is pressed down. The upper surface of the lower base plate 4 is easy to slide because there is no unevenness due to mirror finish. Therefore, even when the lower base plate 4 moves left and right during an earthquake, the protector 10 slides on the upper surface of the lower base plate 4. In the protector 10, when the expansion tube 1 expands, the interval between the slits 20 increases. Air is injected into the air pressure chamber 5 from the air inlet 8.

  FIG. 6 is a perspective view showing the expansion tube 1 (Example 2). The expansion tube 1 has a circular cross section and is provided with a protector 10 on the outside. The protector 10 is formed so as to cover the outside of the expansion tube 1. The protector 10 extends in the longitudinal direction of the expansion tube 1. The expansion tube 1 is expanded by press-fitting air with a soft vinyl chloride tube. The protector 10 is a hard vinyl chloride pipe and is provided with a plurality of slits 20 extending in the longitudinal direction in order to cope with the expansion of the expansion pipe 1.

  FIG. 7 is a cross-sectional view in which the expansion tube 1 of FIG. 6 is embedded in the groove 2 of the upper base plate 3. In the state of FIG. 7, no air is injected into the expansion pipe 1, and no air is injected into the air pressure chamber 5.

  FIG. 8 shows that air is injected into the air pressure chamber 5 from the state shown in FIG. 7 to float the upper base plate 3, and air is press-fitted into the expansion pipe 1 to expand, and the periphery of the air pressure chamber 5 is sealed. It is sectional drawing which shows the state. It is assumed that the upper base plate 3 is levitated to the height shown in the lower left of FIG. In this state, the protector 10 is pressed against the upper surface of the lower base plate 4 by the internal pressure of the expansion tube 1. The upper surface of the lower base plate 4 is easy to slide because there is no unevenness due to mirror finish. Therefore, even when the lower base plate 4 moves left and right during an earthquake, the protector 10 slides on the upper surface of the lower base plate 4. In the protector 10, when the expansion tube 1 expands, the interval between the slits 20 increases.

  FIG. 9 is a perspective view of the expansion tube 1 (Example 3). The expansion tube 1 has a square cross section and is provided with a protector 10 at the bottom. The protector 10 has no slit, is provided so as to cover the bottom of the expansion tube 1, and extends in the longitudinal direction of the expansion tube 1. The expansion tube 1 is a soft vinyl chloride tube, and the protector 10 is a hard vinyl chloride tube.

  FIG. 10 is a cross-sectional view in which the expansion tube 1 of FIG. 9 is embedded in the groove 2 of the upper base plate 3. In the state of FIG. 10, no air is injected into the expansion pipe 1, and no air is injected into the air pressure chamber 5.

  In FIG. 11, air is injected from the state shown in FIG. 10 into the air pressure chamber 5 to float the upper base plate 3, and air is pressed into the expansion pipe 1 to expand and the periphery of the air pressure chamber 5 is sealed. It is sectional drawing which shows the state. In this state, the protector 10 is pressed against the upper surface of the lower base plate 4 by the internal pressure of the expansion tube 1. The upper surface of the lower base plate 4 is easy to slide because there is no unevenness due to mirror finish. Therefore, even when the lower base plate 4 moves left and right during an earthquake, the protector 10 slides on the upper surface of the lower base plate 4.

  FIG. 12 is a perspective view of the joint 11 for an expansion pipe. (A) is an L-shaped joint 11, (B) is a straight joint 11, and (c) is a T-shaped joint 11. An L-shaped joint 11 shown in FIG. 12A can be used at the corner of the air pressure chamber 5 shown in FIG. When it is desired to extend and lengthen the expansion pipe 1, a straight joint 11 shown in FIG. 12 (B) can be used. Although the expansion tube 1 is a closed loop, a T-shaped joint 11 shown in FIG. 12C can be used at the end of the expansion tube 1. The joint 11 is made of a soft vinyl chloride pipe similar to the expansion pipe 1, and the protector 10 is made of a hard vinyl chloride pipe. Thereby, the air leak of the air pressure chamber 5 can be prevented even near the joint. The joint and the expansion pipe 1 may be integrally formed.

  FIG. 13 is a cross-sectional view of the air injection valve 6. In the air injection valve 6, in a state where the air injection holes 12 provided on the side surfaces of the inner cylinder 14 and the outer cylinder 15 coincide with each other, air is injected into the air pressure chamber 5, the upper base plate 3 floats, and the outer cylinder 15 When the air injection hole 12 of the inner cylinder 14 shifts, the air injection is stopped. This state is shown in the drawer circle at the upper right of FIG. The outer cylinder 15 is fixedly attached to the vertical hole of the upper base plate 3 so as to communicate with the air pressure chamber 5. Since the air injection holes 12 are provided in the side surfaces of the inner cylinder 14 and the outer cylinder 15, the inner cylinder 14 does not depress and damage the upper surface of the lower base plate 4 when injecting air.

  When the pressure in the air pressure chamber 5 decreases due to air leakage or the like, when the upper base plate 3 and the outer cylinder 15 are lowered, the air injection holes 12 of the inner cylinder 14 and the outer cylinder 15 coincide with each other and air injection is resumed. . Even when the lower base plate 4 is pushed up by an earthquake and rises, the inner cylinder 14 rises, the air injection holes 12 of the inner cylinder 14 and the outer cylinder 15 coincide, and air injection is resumed. A presser spring 19 is provided on the inner upper portion of the air injection valve 6, that is, on the inner side of the cap 17, and urges the inner cylinder 14 toward the lower base plate 4. Thereby, the inner cylinder 14 can be hold | maintained stably. An O-ring 18 is provided between the inner cylinder 14 and the outer cylinder 15 to prevent air leakage. The air injected into the inner cylinder 14 is blown out from the blowing hole 13 to the air pressure chamber 5. The air injection hole 12 of the air injection valve 6 is provided on the side surfaces of the inner cylinder 14 and the outer cylinder 15. Therefore, the injected air does not press the top of the inner cylinder 14, and the bottom of the inner cylinder 14 does not damage the lower base plate 4.

  The present invention is suitable for an air levitation type seismic isolation device that seals the periphery of an air pressure chamber with an expansion pipe.

DESCRIPTION OF SYMBOLS 1 Expansion pipe 2 Groove 3 Upper base plate 4 Lower base plate 5 Air pressure chamber 6 Air injection valve 7 Pneumatic inlet 8 Air inlet 10 Protector 11 Joint 12 Air injection hole 13 Outlet 14 Inner cylinder 15 Outer cylinder 17 Cap 18 O-ring 19 Presser spring 20 Slit 21 Mirror finish 100 Air levitation type seismic isolation device

Claims (3)

A foundation consisting of an upper foundation plate and a lower foundation plate;
A groove formed on the bottom surface of the upper base plate and dividing the upper base plate and the lower base plate into a plurality of air pressure chambers;
An expansion tube that is embedded in the groove and expands when supplied with air, and closes a horizontal periphery of the air pressure chamber;
A protector that is formed outside the expansion tube, is made of a material harder than the expansion tube, contacts the upper surface of the lower base plate, and extends in the longitudinal direction of the expansion tube;
In the state where the air injection holes provided on the side surfaces of the inner cylinder and the outer cylinder coincide with each other, air is injected into the air pressure chamber, the upper base plate floats, and the outer cylinder and the inner cylinder An air injection valve that stops the injection of air when the air injection hole of
An air levitation type seismic isolation device.
2. The air levitation type seismic isolation device according to claim 1, wherein the upper surface of the lower base plate is mirror-finished with concrete.
2. The air levitation type seismic isolation device according to claim 1, wherein the air injection valve is provided with a presser spring that urges the inner cylinder in the direction of the lower base plate at an inner upper portion.

Images