A seismic isolation device suitable for high-elevated rack storage tank structure under super large earthquake

Abstract

The present application relates to the isolation device of the major lifeline engineering, specifically relates to a kind of isolation device of high lifting frame storage tank structure suitable for super large earthquake, including top concrete slab, bottom concrete slab, horizontal isolation rubber bearing system and sliding support system, the sliding support system is connected by elastic member between, sliding support system includes upper cap plate, cylinder, horizontal pin and bottom connecting steel plate, upper cap plate is left with gap with top concrete slab, cylinder can slide relative to bottom connecting steel plate, the upper cap plate is connected with cylinder by pre-press spring, vertical pin key rod is arranged in the upper cap plate, the horizontal pin is across the lateral wall of upper cap plate and cylinder, the isolation device of the present application, when the earthquake within the fortification intensity occurs, horizontal isolation rubber bearing system bears vertical load, when super large earthquake occurs, the new horizontal isolation system of sliding support system and elastic member composition bears subsequent larger seismic action, protects the safety of upper storage tank.

Description

TECHNICAL FIELD

[0001] The application relates to a seismic isolation device for a major lifeline engineering, and belongs to the technical field of lifeline engineering. BACKGROUND

[0002] The laminated rubber seismic isolation technology mainly reduces the seismic action of the seismic isolation structure by prolonging the structural period and increasing the damping. With the popularization and application of the seismic isolation technology, the laminated rubber seismic isolation, as a relatively mature seismic isolation technology, is widely used in the fields of buildings, bridges and equipment engineering. However, the laminated rubber seismic isolation has limited carrying capacity under the condition of large horizontal shear deformation, and in some lifeline engineering fields, such as LNG large-scale storage tanks, high-elevation storage tanks, nuclear power stations and the like, the projects have a common feature that the vertical load is large and the safety reserve demand is high. When the seismic isolation technology is used for the projects, on one hand, a seismic isolation device with high vertical carrying capacity under the condition of large horizontal deformation is needed, and on the other hand, the seismic isolation structure cannot collapse catastrophically when the earthquake exceeding the fortification intensity occurs, especially for the high-elevation storage tank structure, when the combustible liquid is stored in the storage tank, once the collapse occurs, the fire may be caused, and the consequences will be incalculable.

[0003] In view of the above problems, a special seismic isolation device is needed, that is, the device still has a certain carrying capacity under the condition of large horizontal deformation, and even when the super large earthquake occurs, the entire high-elevation seismic isolation structure still has a certain seismic isolation function and does not collapse. SUMMARY

[0004] The application aims to provide a seismic isolation device which not only has a horizontal seismic isolation function, but also has a certain carrying capacity when the super large earthquake occurs, so as to prevent the high-elevation storage tank seismic isolation structure from collapsing.

[0005] The application achieves the above-mentioned purpose by the following technical scheme.

[0006] The application discloses a seismic isolation device for high-elevated storage tank structure under super large earthquake, which comprises a top concrete slab, a horizontal seismic isolation rubber bearing system, a plurality of sliding bearing systems and a bottom concrete slab, the horizontal seismic isolation rubber bearing system is arranged between the top concrete slab and the bottom concrete slab, the sliding bearing systems are arranged around the horizontal seismic isolation rubber bearing system, the sliding bearing systems are connected through elastic members, the sliding bearing system comprises an upper cap plate with downward opening, a cylinder, a horizontal pin and a bottom connecting steel plate, the upper cap plate is spaced apart from the top concrete slab, the bottom of the bottom connecting steel plate is fixedly connected with the bottom concrete slab, the cylinder can slide relative to the bottom connecting steel plate, the top of the cylinder is provided with a groove, the upper cap plate covers the top of the cylinder, the upper cap plate and the cylinder are connected through pre-pressing springs in series, vertical pin keys are arranged in the upper cap plate, first perforations are arranged on the side wall of the upper cap plate, second perforations are arranged on the side wall of the cylinder, the horizontal pin passes through the first perforations and the second perforations, and grooves through which the vertical pin keys pass are arranged on the horizontal pin; in a non-working state, the free end of the vertical pin key is aligned with the upper part of the groove of the vertical pin key.

[0007] Preferably, the top of the upper cap plate is provided with a convex key.

[0008] Further, the cylinder comprises an upper concave plate, an intermediate cylinder and a lower cylinder which are sequentially connected through bolts from top to bottom, the upper concave plate is connected with the upper cap plate through pre-pressing springs in series, the lower cylinder slides relative to the bottom connecting steel plate, and the side surface of the intermediate cylinder is connected with the elastic member.

[0009] Further, the bottom of the lower cylinder is provided with a recess, the recess is provided with a horizontal polytetrafluoroethylene plate, and a stainless steel mirror plate is arranged on the bottom connecting steel plate.

[0010] Preferably, the outer circumferential wall of the upper concave plate is provided with an annular polytetrafluoroethylene plate.

[0011] Preferably, the elastic member comprises a horizontal spring and a spring mounting base, the spring mounting base is arranged on the bottom concrete slab between two sliding bearing systems, and the horizontal spring is arranged between the spring mounting base and the sliding bearing system.

[0012] Preferably, the horizontal seismic isolation rubber bearing system comprises an upper connecting plate, a seismic isolation rubber bearing and a lower connecting plate, and the seismic isolation rubber bearing is any one of a natural seismic isolation rubber bearing, a high-damping seismic isolation rubber bearing or a lead core seismic isolation rubber bearing.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] The present invention relates to a seismic isolation device suitable for elevated storage tank structures under mega-earthquakes. When an earthquake occurs within the design intensity, the horizontal seismic isolation rubber bearing system in the middle bears the vertical load transmitted from the upper part, while undergoing horizontal shear deformation to dissipate seismic energy and ensure the safety of the upper storage tank structure. When a mega-earthquake occurs beyond the design intensity, the horizontal seismic isolation system in the middle transfers the vertical and horizontal loads to a new horizontal seismic isolation system composed of a sliding bearing system and elastic elements, which continues to bear the subsequent larger seismic forces and protect the safety of the upper storage tank. The seismic isolation bearing mechanism has a simple and clear structure and requires no maintenance throughout the entire process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the vibration isolation device of the present invention.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the rubber system for horizontal seismic isolation bearings.

[0017] Figure 3 for Figure 1 A schematic diagram of the sliding support system in the diagram.

[0018] Figure 4 for Figure 3 A sectional view.

[0019] Figure 5 for Figure 3 A schematic diagram of the upper and middle cap plate.

[0020] Figure 6 for Figure 3 A structural schematic diagram of the upper and middle cap plate from another perspective.

[0021] Figure 7 for Figure 1 A schematic diagram of the structure of the horizontal pin. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Example 1.

[0024] like Figures 1-7As shown, the embodiment provides a seismic isolation device suitable for high-elevated storage tank structure under super large earthquake, which comprises a top concrete slab 1, a horizontal seismic isolation rubber bearing system 2, a plurality of sliding bearing systems 3 and a bottom concrete slab 6, the horizontal seismic isolation rubber bearing system 2 is arranged between the top concrete slab 1 and the bottom concrete slab 6, the sliding bearing systems 3 are arranged around the horizontal seismic isolation rubber bearing system 2, the sliding bearing systems 3 are connected through elastic elements, the sliding bearing system 3 comprises an upper cap plate 31 with downward opening, a cylinder, a horizontal pin 35 and a bottom connecting steel plate 310, the upper cap plate 31 has a gap with the top concrete slab 1, the bottom of the bottom connecting steel plate 310 is fixedly connected with the bottom concrete slab 6, the cylinder can slide relative to the bottom connecting steel plate 310, the top of the cylinder is provided with a groove, the upper cap plate 31 is covered on the top of the cylinder, the upper cap plate 31 and the cylinder are connected through pre-pressing springs 33 in series, a vertical pin key rod 314 is arranged in the upper cap plate 31, a first perforation 312 is arranged on the side wall of the upper cap plate 31, a second perforation is arranged on the side wall of the cylinder, the horizontal pin 35 passes through the first perforation 312 and the second perforation, a slot hole 351 through which the vertical pin key rod 314 passes is arranged on the horizontal pin 35, in the non-working state of the sliding bearing system 3, the free end of the vertical pin key rod 314 is aligned with the upper part of the slot hole 351 of the vertical pin key rod 314.

[0025] The seismic isolation device suitable for high-elevated storage tank structure under super large earthquake of the application, when the earthquake within the fortification intensity occurs, the horizontal seismic isolation rubber bearing system 2 in the middle bears the vertical load from the upper part, and simultaneously, the horizontal direction occurs shear deformation, the earthquake energy is consumed, and the safety of the upper storage tank structure is ensured, when the earthquake exceeding the design intensity occurs, the horizontal deformation of the horizontal seismic isolation rubber bearing system 2 in the middle is super large, the top concrete slab 1 will descend, contact the upper cap plate 31 of the sliding bearing system 3 and exert pressure on the upper cap plate 31, the upper cap plate 31 is vertically compressed, the vertical pin key rod 314 will be inserted into the slot hole 351 of the horizontal pin 35, the horizontal pin 35 will retreat into the upper cap plate 31, at this time, the upper cap plate 31 will be separated from the cylinder under the jacking action of the pre-pressing spring 33, further contact the top concrete slab 1 and bear force, at this time, the horizontal seismic isolation rubber bearing system 2 in the middle is pressed or horizontally sheared to quit work, the new horizontal sliding isolation system composed of the sliding bearing system 3 and the elastic element continues to bear the subsequent larger earthquake action, and the safety of the upper storage tank is protected, the seismic isolation bearing mechanism is simple and clear in structure, and is maintained throughout the process.

[0026] The top of the upper cap plate 31 is provided with a key 311, the setting of the key 311 will increase the friction force between the top concrete slab 1 and the sliding bearing system 3.

[0027] The cylinder body includes upper concave plate 32, middle cylinder body 36 and lower cylinder body 37 connected by bolts from top to bottom, upper concave plate 32 is connected with upper cover cap plate 31 through pre-press spring 33, lower cylinder body 37 slides relative to bottom connecting steel plate 310, the side of middle cylinder body 36 is connected with elastic member.

[0028] The bottom of lower cylinder body 37 is provided with recess, the recess is provided with horizontal polytetrafluoroethylene plate 38, stainless steel mirror plate 39 is arranged on bottom connecting steel plate 310, and the two can slide relative to each other.

[0029] The outer peripheral wall of upper concave plate 32 is provided with annular polytetrafluoroethylene plate 34, which is beneficial to the separation of upper cover cap plate 31 and upper concave plate 32.

[0030] The elastic member includes horizontal spring 4 and spring mounting base 5, spring mounting base 5 is arranged on bottom concrete plate 6 between two sliding support systems 3, horizontal spring 4 is arranged between spring mounting base 5 and sliding support system 3, which can effectively limit the sliding of lower cylinder body 37 relative to bottom connecting steel plate 310.

[0031] The horizontal isolation rubber bearing system 2 comprises an upper connecting plate 21, an isolation rubber bearing 22 and a lower connecting plate 23, wherein the isolation rubber bearing 22 is any one of a natural isolation rubber bearing, a high-damping isolation rubber bearing or a lead-core isolation rubber bearing. During installation, the upper connecting plate 21 is first bolted to the top of the isolation rubber bearing 22, and the lower connecting plate 23 is bolted to the bottom of the isolation rubber bearing 22, to form the horizontal isolation rubber bearing system 2. Then, the upper connecting plate 21 in the horizontal isolation rubber bearing system 2 is connected to the top concrete slab 1, and the lower connecting plate 23 in the horizontal isolation rubber bearing system 2 is connected to the bottom concrete slab 6. Before the overall sliding system is installed, the sliding bearing system 3 is first assembled. The stainless steel mirror plate 39 is first welded around the periphery and connected to the bottom connecting steel plate 310, and then the bottom connecting steel plate 310 is bolted to the bottom concrete slab 6. The top surface of the horizontal polytetrafluoroethylene plate 38 is embedded in the recess at the bottom of the lower cylinder 37 of the sliding bearing system 3, and the bottom surface of the horizontal polytetrafluoroethylene plate 38 is in close contact with the stainless steel mirror plate 39. The lower cylinder 37 is vertically connected to the middle cylinder 36 by bolts. The top of the middle cylinder 36 and the upper concave plate 32 are bolted together. The upper cap 31 is vertically connected to the upper concave plate 32 by the pre-compressed spring 33, and at the same time, the annular polytetrafluoroethylene plate 34 is bonded around the upper concave plate 32. By applying a certain pressure to the top surface of the upper cap 31, the pre-compressed spring 33 is compressed. When the first perforation on the side of the upper cap 31 is aligned with the second perforation on the side of the upper concave plate 32, the horizontal pin 35 is inserted, and the horizontal pin 35 is aligned with the top of the cutout of the vertical pin key rod 314 in the upper cap 31. At this time, the sliding bearing system 3 is installed. The other three sliding bearing systems 3 around the horizontal isolation rubber bearing system 2 are assembled in the above order, and the spring fixing base 5 is installed at the middle position between the adjacent two sliding bearing systems 3. The horizontal spring 4 is installed between the side of the middle cylinder 36 of the sliding bearing system 3 and the spring fixing base 5, to form a new horizontal sliding isolation system.

[0032] When a design intensity earthquake occurs, the horizontal isolation rubber bearing system 2 in the middle part bears the vertical load and at the same time, horizontal shear deformation occurs, thereby reducing the seismic action of the upper structure. At this time, the new horizontal sliding isolation system composed of the sliding bearing system 3, the horizontal spring 4 and the spring fixing base 5 does not bear the vertical load because there is a gap vertically between the sliding bearing system 3 and the top concrete slab 1, and the relative position between the horizontal sliding isolation system and the bottom concrete slab 6 remains unchanged in the horizontal direction, and the horizontal sliding isolation system does not bear the horizontal load.

[0033] When the earthquake intensity exceeds the design intensity, the central horizontal isolation system 2 will have a large horizontal deformation, the top concrete slab 1 will drop and contact the upper cap plate 31 of the sliding support system 3 and exert pressure on it. On the one hand, the upper cap plate 31 is provided with a key 311, which will increase the friction between the top concrete slab 1 and the sliding support system 3. On the other hand, the upper cap plate 31 will be vertically compressed, and the vertical pin key rod 314 in the upper cap plate 31 will be inserted into the slot hole 351 of the horizontal pin 35, the horizontal pin 35 will retreat into the upper cap plate 31, the upper cap plate 31 will be separated from the upper concave plate 32 under the jacking action of the pre-compressed spring 33, and will be jacked further to contact the top concrete under force. At this time, the central horizontal isolation rubber bearing system 2 is compressed or horizontally sheared and exits the work, and the horizontal shock absorption function in the super large earthquake will be borne by the new horizontal sliding isolation system composed of the sliding support system 3, the horizontal spring 4 and the spring fixed base 5, further protecting the safety of the upper structure.

[0034] It should be understood by those of ordinary skill in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest the scope of the disclosure (including claims) is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in details. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A seismic isolation device for a high elevated tank structure against a mega earthquake, characterized in that, The application relates to a structure with a top concrete slab, a horizontal isolation rubber bearing system, a plurality of sliding bearing systems and a bottom concrete slab, wherein the horizontal isolation rubber bearing system is arranged between the top concrete slab and the bottom concrete slab, the sliding bearing systems are arranged around the horizontal isolation rubber bearing system, the sliding bearing systems are connected by elastic members, the sliding bearing system comprises an upper cap plate with an opening downward, a cylinder, a horizontal pin and a bottom connecting steel plate, the upper cap plate is spaced apart from the top concrete slab, the bottom of the bottom connecting steel plate is fixedly connected with the bottom concrete slab, the cylinder can slide relative to the bottom connecting steel plate, the top of the cylinder is provided with a groove, the upper cap plate covers the top of the cylinder, the upper cap plate and the cylinder are connected by pre-pressing springs in series, a vertical pin key rod is arranged in the upper cap plate, a first perforation is arranged on the sidewall of the upper cap plate, a second perforation is arranged on the sidewall of the cylinder, the horizontal pin penetrates through the first perforation and the second perforation, a slot hole through which the vertical pin key rod passes is arranged on the horizontal pin, and the free end of the vertical pin key rod is aligned with the upper part of the slot hole of the horizontal pin in a non-working state.

2. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 1, wherein The top of the upper cap plate is provided with a convex key.

3. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 1, wherein The cylinder comprises an upper concave plate, an intermediate cylinder and a lower cylinder which are sequentially connected by bolts from top to bottom, the upper concave plate is connected with the upper cap plate by pre-pressing springs in series, the lower cylinder slides relative to the bottom connecting steel plate, and the sidewall of the intermediate cylinder is connected with the elastic member.

4. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 3, wherein The bottom of the lower cylinder is provided with a recess, the recess is provided with a horizontal polytetrafluoroethylene plate, and a stainless steel mirror plate is arranged on the bottom connecting steel plate.

5. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 3, wherein An annular polytetrafluoroethylene plate is arranged on the outer circumferential wall of the upper concave plate.

6. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 1, wherein The elastic member comprises a horizontal spring and a spring mounting base, the spring mounting base is arranged on the bottom concrete slab between two sliding bearing systems, and the horizontal spring is arranged between the spring mounting base and the sliding bearing system.

7. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to any one of claims 1 to 6, characterized in that, The isolation rubber bearing is a natural isolation rubber bearing or a high-damping isolation rubber bearing.

8. The seismic isolation device for high elevated rack storage tank structure against mega earthquake according to claim 7, wherein The high-damping isolation rubber bearing is a lead-core isolation rubber bearing.

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