Rigid pile composite foundation seismic mitigation and isolation system for LNG (Liquefied Natural Gas) storage tank

Abstract

The utility model discloses a rigid pile composite foundation seismic mitigation and isolation system for an LNG (Liquefied Natural Gas) storage tank, which belongs to the technical field of foundation seismic mitigation and isolation and comprises an upper-layer raft plate, a lower-layer raft plate, a seismic mitigation and isolation damping device, a gravel cushion layer, an LNG storage tank body and a plurality of groups of rigid piles, the lower end of the LNG storage tank body is fixedly connected with an upper-layer raft plate through a mounting bracket, and a shock absorption and isolation damping device is mounted between the bottom of the upper-layer raft plate and the top of the lower-layer raft plate; the gravel cushion layer is laid between the bottom of the lower raft and the top of the rigid pile. By means of the mode, through layer-by-layer shock insulation and shock absorption, the pile top acting force of the rigid piles is reduced when reaching an upper building, meanwhile, the number of the piles resisting horizontal acting force is reduced, the pile foundation engineering cost is reduced, the purpose of disaster reduction is achieved, and the structure is suitable for areas with high seismic intensity.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation vibration reduction and isolation, and in particular to a rigid pile composite foundation vibration reduction and isolation system for an LNG storage tank. Background Art

[0002] In order to ensure the safe storage of flammable and explosive dangerous goods LNG (natural gas), its foundation and structural design is particularly important under earthquake conditions.

[0003] Currently, most LNG storage tanks are designed with the pile tops directly embedded in the raft to resist earthquake forces and transfer upper loads. However, in areas with high earthquake intensity, this foundation solution requires a large amount of steel bars to be configured on the tank body and foundation piles, which has the disadvantages of large concentrated internal forces on the pile tops, difficult construction, and high costs.

[0004] Based on this, the utility model designs a rigid pile composite foundation seismic isolation system for LNG storage tanks to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a rigid pile composite foundation seismic isolation system for LNG storage tanks.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A rigid pile composite foundation seismic isolation system for an LNG storage tank comprises an upper raft, a lower raft, a seismic isolation damping device, a gravel cushion layer, an LNG storage tank body and a plurality of groups of rigid piles; the lower end of the LNG storage tank body is fixedly connected with the upper raft through a mounting bracket, and the seismic isolation damping device is installed between the bottom of the upper raft and the top of the lower raft; the gravel cushion layer is laid between the bottom of the lower raft and the top of the rigid piles;

[0008] The seismic isolation and damping device comprises a bottom plate;

[0009] The upper end of the bottom plate is fixedly connected to a plurality of groups of spliced ​​support components for supporting the hemispherical seat;

[0010] The hemispherical seat is fixedly installed at the bottom of the connecting plate, an adjusting component for adjusting the height is installed at the upper end of the connecting plate, and the top of the adjusting component is connected to the top plate.

[0011] Furthermore, the rigid piles are selected from CFG piles, PHC pipe piles, reinforced concrete cast-in-place piles or steel piles.

[0012] Furthermore, the sand and gravel cushion layer is a sand layer or a stone layer.

[0013] Furthermore, the steel piles are selected from steel pipe piles, I-shaped steel piles or H-shaped steel piles.

[0014] Furthermore, the splicing support assembly includes a limiting slide groove, a limiting slider, a fixing piece, an arc groove, a quarter-circle support seat, an insert block and a first socket; four groups of limiting slide grooves are provided on the bottom plate, the limiting slide grooves are slidably connected with the limiting sliders, the inner sides of the limiting sliders are fixedly connected with the quarter-circle support seats, the upper ends of the limiting sliders are connected with insert blocks, the insert blocks are embedded in the first sockets provided on the bottom plate, and the insert blocks are fixedly connected to the bottom plate through the fixing piece; the upper end of the quarter-circle support seat is provided with an arc groove which fits in contact with the bottom of the hemispherical seat.

[0015] Furthermore, limit sliding grooves are provided at both the front and rear ends and the left and right ends of the bottom plate.

[0016] Furthermore, the limiting slider is fixedly connected to the bottom of the quarter-circle support seat.

[0017] Furthermore, the middle part of the insert block is inserted into the second insert hole provided on the limit sliding block.

[0018] Furthermore, the adjustment assembly includes a polygonal connecting piece, an inner cylinder, a transverse axis, an outer cylinder, a worm, a threaded rod, a threaded sleeve and a worm wheel; the top of the connecting plate is fixedly connected to the inner cylinder, the upper outer wall of the inner cylinder is slidingly connected to the inner wall of the outer cylinder, the outer cylinder is fixedly installed on the bottom of the top plate, the bottom of the top plate is fixedly connected to multiple groups of threaded rods, the lower ends of the threaded rods are respectively threadedly connected to the threaded sleeves, the bottom of the threaded sleeves is rotatably installed on the top of the connecting plate and located inside the inner cylinder, the threaded sleeves are fixedly connected to worm wheels, the worm wheels are meshed with the worm, the worm is fixedly installed on the transverse axis, the transverse axis is laterally rotatably installed on the inner cylinder, and one end of the transverse axis is fixedly connected to the polygonal connecting piece, and the polygonal connecting piece is located outside the inner cylinder.

[0019] Furthermore, the four arc grooves are combined into a hemispherical shape having the same shape as the bottom of the hemispherical seat.

[0020] Beneficial Effects

[0021] The main body of the utility model is an upper raft, a lower raft, rigid piles, a seismic isolation and damping device, and a sand and gravel mattress layer. Through layer-by-layer seismic isolation and shock absorption, the pile top force of the rigid pile is reduced when it reaches the upper building. At the same time, the number of piles resisting horizontal forces is reduced, reducing the cost of pile foundation engineering, achieving the purpose of disaster reduction, and being suitable for areas with high earthquake intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a structural diagram of a rigid pile composite foundation seismic isolation system for LNG storage tanks according to the utility model;

[0024] Figure 2 The utility model is a three-dimensional Figure 1 ;

[0025] Figure 3 It is a front view of the seismic isolation and damping device of the utility model;

[0026] Figure 4 It is a left side view of the seismic isolation and damping device of the utility model;

[0027] Figure 5 The utility model is a three-dimensional Figure 2 ;

[0028] Figure 6 For along Figure 4 AA direction cross-sectional view;

[0029] Figure 7 It is a schematic diagram of the installation structure of the bottom plate and the spliced ​​support assembly of the utility model.

[0030] The numbers in the figure represent:

[0031] 1. Upper raft; 2. Lower raft; 3. Rigid piles; 4. Seismic isolation and damping device; 41. Bottom plate; 42. Spliced ​​support assembly; 421. Limit slide; 422. Limit slider; 423. Fixing piece; 424. Arc groove; 425. Quarter-circle support seat; 426. Insert block; 427. First plug hole; 428. Second plug hole; 43. Connecting plate; 44. Adjusting assembly; 441. Polygonal connector; 442. Inner tube; 443. Horizontal axis; 444. Outer tube; 445. Worm; 446. Threaded rod; 447. Threaded sleeve; 448. Worm wheel; 45. Top plate; 46. Hemispherical seat; 5. Sand and gravel cushion layer; 6. LNG storage tank body. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The utility model is further described below in conjunction with embodiments.

[0034] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0035] Example 1

[0036] Please refer to the instruction manual Figure 1-7 A rigid pile composite foundation seismic isolation system for an LNG storage tank comprises an upper raft 1, a lower raft 2, a seismic isolation damping device 4, a gravel cushion layer 5, an LNG storage tank body 6 and a plurality of groups of rigid piles 3; the lower end of the LNG storage tank body 6 is fixedly connected with the upper raft 1 through a mounting bracket, and the seismic isolation damping device 4 is installed between the bottom of the upper raft 1 and the top of the lower raft 2; the gravel cushion layer 5 is laid between the bottom of the lower raft 2 and the top of the rigid pile 3;

[0037] The rigid pile 3 can be selected from CFG piles, PHC pipe piles, reinforced concrete piles or steel piles;

[0038] The gravel cushion layer 5 is a sand layer or a stone layer with a certain thickness;

[0039] CFG piles can also be replaced with plain concrete piles;

[0040] PHC piles are hollow piles formed by pouring ordinary Portland cement into a pile mold;

[0041] Reinforced concrete cast-in-place piles are piles made by drilling holes, lowering steel cages, and then pouring concrete;

[0042] Steel piles can be selected from steel pipe piles, I-shaped steel piles or H-shaped steel piles.

[0043] The main body of the utility model is an upper raft 1, a lower raft 2, a rigid pile 3, a seismic isolation and damping device 4, and a sand and gravel cushion layer 5. Through layer-by-layer seismic isolation and shock absorption, the pile top force of the rigid pile 3 is reduced when it reaches the upper building. At the same time, the number of piles resisting horizontal forces is reduced, the cost of pile foundation engineering is reduced, and the purpose of disaster reduction is achieved. The utility model is suitable for areas with high earthquake intensity.

[0044] Example 2

[0045] Please refer to the instruction manual Figure 1-7 The seismic isolation and damping device 4 comprises a bottom plate 41; the bottom plate 41 is fixedly mounted on the top of the lower raft 2;

[0046] The upper end of the bottom plate 41 is fixedly connected with a plurality of groups of spliced ​​support components 42 for supporting the hemispherical seat 46;

[0047] The spliced ​​support assembly 42 includes a limiting slide groove 421, a limiting slider 422, a fixing piece 423, an arc groove 424, a quarter-circle support seat 425, an insert block 426 and a first plug hole 427; four groups of limiting slide grooves 421 are provided on the bottom plate 41, and the limiting slide grooves 421 are slidably connected to the limiting slider 422, and the inner side of the limiting slider 422 is fixedly connected to the quarter-circle support seat 425, and the upper end of the limiting slider 422 is connected to the insert block 426, and the insert block 426 is embedded in the first plug hole 427 provided on the bottom plate 41, and the insert block 426 is fixedly connected to the bottom plate 41 through the fixing piece 423; the upper end of the quarter-circle support seat 425 is provided with an arc groove 424 that fits and contacts with the bottom of the hemispherical seat 46;

[0048] The bottom plate 41 is provided with limited sliding grooves 421 at both the front and rear ends and the left and right ends;

[0049] The limiting slider 422 is fixedly connected to the bottom of the quarter-circle support seat 425;

[0050] The four arc grooves 424 are fitted and contacted with each other to form a complete structure; the four arc grooves 424 are combined into a hemispherical shape with the same shape as the bottom of the hemispherical seat 46;

[0051] The middle part of the insert block 426 is inserted into the second insert hole 428 provided on the limit slider 422;

[0052] During installation, push the quarter-circle support seat 425 inward, the quarter-circle support seat 425 drives the limit slider 422 to slide along the limit slide groove 421, and the limit slider 422 drives the plug block 426 to move. When the plug block 426 corresponds to the first plug hole 427 up and down, put the plug block 426 into the first plug hole 427, and at the same time, the middle part of the plug block 426 is completely embedded in the second plug hole 428, and then fix the plug block 426 and the bottom plate 41 through the fixing piece 423 to achieve fixation; then put the hemispherical seat 46 into the arc groove 424;

[0053] The hemispherical seat 46 is fixedly mounted on the bottom of the connecting plate 43. An adjusting assembly 44 for adjusting the height is mounted on the upper end of the connecting plate 43. The top of the adjusting assembly 44 is connected to the top plate 45.

[0054] The adjusting assembly 44 comprises a polygonal connecting piece 441, an inner cylinder 442, a transverse axis 443, an outer cylinder 444, a worm 445, a threaded rod 446, a threaded sleeve 447 and a worm wheel 448; the top of the connecting plate 43 is fixedly connected with the inner cylinder 442, the upper end outer wall of the inner cylinder 442 is fitted and slidably connected with the inner wall of the outer cylinder 444, the outer cylinder 444 is fixedly installed on the bottom of the top plate 45, the bottom of the top plate 45 is fixedly connected with a plurality of groups of threaded rods 446, the lower ends of the threaded rods 446 are respectively The threaded sleeve 447 is threadedly connected, the bottom of the threaded sleeve 447 is rotatably mounted on the top of the connecting plate 43 and is located inside the inner cylinder 442, the threaded sleeve 447 is fixedly connected with a worm wheel 448, the worm wheel 448 is meshedly connected with the worm 445, the worm 445 is fixedly mounted on the horizontal shaft 443, the horizontal shaft 443 is rotatably mounted on the inner cylinder 442, and one end of the horizontal shaft 443 is fixedly connected to the polygonal connecting piece 441, and the polygonal connecting piece 441 is located outside the inner cylinder 442;

[0055] The polygonal connector 441 is rotated by an external tool to drive the horizontal axis 443 to rotate, the horizontal axis 443 drives the worm 445 to rotate, the worm 445 drives the worm wheel 448 to rotate, the worm wheel 448 drives the threaded sleeve 447 to rotate, the threaded sleeve 447 drives the threaded rod 446 to move upward or downward, and the threaded rod 446 drives the top plate 45 to move upward or downward to achieve the purpose of adjustment.

[0056] Example 3

[0057] The rigid pile composite foundation seismic isolation system for LNG storage tanks is installed by following the steps below:

[0058] 1. If the rigid pile 3 adopts CFG pile, the pile is cast into pile by long spiral drilling, and materials such as crushed stone, stone chips, sand, fly ash and cement are used. The steel cage is inserted in the middle by hoisting. The steel cage may not be inserted according to the design requirements; if the rigid pile 3 adopts PHC pipe pile or steel pile, the pile is formed by hammering or static pressure;

[0059] 2. A sand and gravel cushion layer 5 is laid on the top of the rigid pile 3 to ensure the interaction between the rigid pile 3, the soil between the piles and the lower raft 2 to exert the vertical bearing capacity of the soil between the piles;

[0060] The gravel cushion layer 5 plays a role in seismic isolation. It uses the characteristics of high friction coefficient between gravel and sand and inability to transmit tension to consume the energy generated by the earthquake through shear friction deformation between sand / stone, thereby reducing the effect of the earthquake on the structure and foundation. When an earthquake occurs, the upper structure undergoes a certain degree of rigid body translation with it, and the gravel cushion layer 5 and the foundation soil form a natural seismic isolation layer. The seismic energy can be absorbed through the deformation of the sand / stone and the foundation soil, thereby reducing the transmission of seismic energy to the upper structure and achieving the effect of seismic isolation.

[0061] 3. placing a lower raft slab 2 on the upper part of the gravel cushion layer 5, and arranging steel bars inside the lower raft slab 2;

[0062] 4. Installing a seismic isolation damping device 4 on the upper part of the lower raft 2;

[0063] Fifth, the upper raft 1 is installed on the seismic isolation damping device 4, and the upper raft 1 is fixedly installed on the bottom of the LNG storage tank body 6, and finally a rigid pile composite foundation seismic isolation system for the LNG storage tank is formed.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rigid pile composite foundation seismic isolation system for LNG storage tanks, characterized in that: The invention comprises an upper raft plate (1), a lower raft plate (2), a seismic isolation damping device (4), a gravel cushion layer (5), an LNG storage tank body (6) and a plurality of groups of rigid piles (3); the lower end of the LNG storage tank body (6) is fixedly connected to the upper raft plate (1) via a mounting bracket, and the seismic isolation damping device (4) is installed between the bottom of the upper raft plate (1) and the top of the lower raft plate (2); the gravel cushion layer (5) is laid between the bottom of the lower raft plate (2) and the top of the rigid pile (3); The seismic isolation and damping device (4) comprises a bottom plate (41); The upper end of the bottom plate (41) is fixedly connected with a plurality of groups of spliced ​​support components (42) for supporting the hemispherical seat (46); The hemispherical seat (46) is fixedly mounted on the bottom of the connecting plate (43), and an adjusting assembly (44) for adjusting the height is mounted on the upper end of the connecting plate (43), and the top of the adjusting assembly (44) is connected to the top plate (45).

2. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 1 is characterized in that: The rigid pile (3) is selected from CFG piles, PHC pipe piles, reinforced concrete cast-in-place piles or steel piles.

3. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 2 is characterized in that: The sand and gravel cushion layer (5) is a sand layer or a stone layer.

4. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 3 is characterized in that: The steel piles are selected from steel pipe piles, I-shaped steel piles or H-shaped steel piles.

5. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 4 is characterized in that: The spliced ​​support assembly (42) comprises a limiting slide groove (421), a limiting slider (422), a fixing member (423), an arc groove (424), a quarter-circular support seat (425), an insert block (426) and a first plug hole (427); four groups of limiting slide grooves (421) are provided on the bottom plate (41), the limiting sliders (422) are slidably connected in the limiting slide grooves (421), and the inner side of the limiting slider (422) is fixed A quarter-circular support seat (425) is fixedly connected, and an insert block (426) is connected to the upper end of the limit slider (422). The insert block (426) is embedded in a first insert hole (427) opened on the bottom plate (41), and the insert block (426) is fixedly connected to the bottom plate (41) through a fixing member (423); an arc groove (424) is opened at the upper end of the quarter-circular support seat (425) to fit and contact with the bottom of the hemispherical seat (46).

6. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 5 is characterized in that: The bottom plate (41) is provided with limit sliding grooves (421) at both the front and rear ends and the left and right ends.

7. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 6 is characterized in that: The limiting sliding block (422) is fixedly connected to the bottom of the quarter-circle supporting seat (425).

8. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 7 is characterized in that: The middle portion of the insert block (426) is inserted into a second insert hole (428) provided on the limiting slider (422).

9. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 8, characterized in that: The adjusting assembly (44) comprises a polygonal connecting piece (441), an inner cylinder (442), a transverse axis (443), an outer cylinder (444), a worm (445), a threaded rod (446), a threaded sleeve (447) and a worm wheel (448); the top of the connecting plate (43) is fixedly connected with the inner cylinder (442); the upper outer wall of the inner cylinder (442) is slidably connected to the inner wall of the outer cylinder (444); the outer cylinder (444) is fixedly mounted on the bottom of the top plate (45); the bottom of the top plate (45) is fixedly connected with a plurality of groups of threaded rods (446); the lower ends of the threaded rods (446) are fixedly connected to the inner wall of the outer cylinder (444); They are respectively threadedly connected with the threaded sleeve (447), the bottom of the threaded sleeve (447) is rotatably mounted on the top of the connecting plate (43) and is located inside the inner cylinder (442), the threaded sleeve (447) is fixedly connected with a worm wheel (448), the worm wheel (448) is meshingly connected with the worm (445), the worm (445) is fixedly mounted on the transverse shaft (443), the transverse shaft (443) is transversely rotatably mounted on the inner cylinder (442), and one end of the transverse shaft (443) is fixedly connected with a polygonal connecting piece (441), and the polygonal connecting piece (441) is located outside the inner cylinder (442).

10. The rigid pile composite foundation seismic isolation system for LNG storage tanks according to claim 9, characterized in that: The four arc grooves (424) are combined into a hemispherical shape having the same shape as the bottom of the hemispherical seat (46).

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