A seismic isolation joint system with short overlap length

Abstract

The present invention discloses a seismic isolation joint system with a short overlap length, which is arranged in the seismic isolation joint between the seismic isolation building structure and the non-seismic isolation soil body, and includes a cover plate structure, an overlap support structure and an anti-fall structure, wherein the cover plate structure covers the seismic isolation joint, the connecting end of the cover plate structure is connected to the seismic isolation building structure, the free end overlaps the non-seismic isolation soil body, and the free end of the cover plate structure slides freely. The present invention utilizes the cooperation of the cover plate structure and the anti-fall structure to reduce the overall space occupied by the seismic isolation joint system, and ensures that the seismic isolation joint still has enough sliding space when an earthquake occurs, does not affect the seismic isolation effect of the seismic isolation joint, and also does not cause the cover plate to fall, be squeezed and crushed, or be lifted too high within the normal sliding range.

Description

Technical Field

[0001] The invention relates to the technical field of seismic isolation joints, and in particular to a seismic isolation joint system with a short overlap length. Background Art

[0002] The base-isolated building needs to set up retaining walls outside the outer columns of the isolation layer to form a horizontal deformation space for the support, namely the isolation joint. The isolation joint belongs to the range of the outdoor floor, and a cover plate needs to be set up to cover the isolation joint. Due to the needs of the building plan, the top elevation of the isolation joint cover plate needs to be flush with the outdoor floor to form a flat ground. When the isolation joint cover plate is set up, one end is connected to the isolation building as the connecting end, and the other end needs to be able to slide freely as a free end to compensate for the displacement on both sides of the isolation joint when an earthquake occurs.

[0003] Traditional seismic isolation joint covers are usually made of prefabricated concrete slabs or steel plates. When setting, the free end of the seismic isolation joint cover is usually tightly attached to the sliding surface to cover the seismic isolation joint. In general, in order to ensure that there is no gap between the cover and the ground when the seismic isolation superstructure reaches the maximum deformation, and does not fall into the seismic isolation joint, at least a lap length of d+50mm and a sliding space of d are required. Then, starting from the building wall, a total of about 3d width of outdoor space is required, which has a great impact on the construction plan of the building. Secondly, because the sliding surface is tightly attached to the free end of the cover, the seismic isolation structure of the seismic isolation joint may cause the cover to slip and warp when it is deformed under the action of temperature, affecting normal use. Finally, most seismic isolation joint covers are flat or rigidly connected. When an earthquake occurs, the cover will almost be broken due to extrusion and can no longer cover the seismic isolation joint, or the cover will be squeezed and warped too high, which will affect the passage of people and pose a great danger when an earthquake occurs.

[0004] Existing seismic isolation joint covers such as CN115182634A and CN116556436A have avoided the problem of seismic isolation joint covers being squeezed and crushed by changing the design, but still cannot solve the problem that the entire seismic isolation joint occupies a large space and has a poor self-reset function. The present invention provides a seismic isolation joint system with a short overlap length to solve the above problems. Summary of the invention

[0005] The present invention provides a seismic isolation joint system with a short overlap length, which reduces the overlap length and solves the problem of large overall space occupied by the seismic isolation joint by utilizing an anti-fall structure.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A seismic isolation joint system with a short overlap length is arranged in a seismic isolation joint between a seismic isolation building structure and a non-seismic isolation soil body, and comprises a cover plate structure, an overlap support structure and an anti-fall structure, wherein the cover plate structure covers the seismic isolation joint, the connecting end of the cover plate structure is connected to the seismic isolation building structure, the free end is overlapped on the non-seismic isolation soil body, and the free end of the cover plate structure is free to slide; The overlap support structure is arranged on the non-seismic isolation soil body, and the anti-falling structure is arranged in the seismic isolation joint; In the extruded state and the free state, the cover plate structure is located on the overlapped support structure, and in the separated state, the free end of the cover plate structure is located on the anti-fall structure; In the free state and the separated state, the anti-falling structure is in the free state, and its length is not less than d. After the anti-falling structure is completely squeezed, its length is less than Ld; L is the width of the isolation joint, d is the maximum displacement of the isolation structure under a rare earthquake, L>d.

[0007] Furthermore, the anti-falling structure includes an anti-falling plate, an anti-falling frame and a reset mechanism. The anti-falling frame is arranged in the seismic isolation joint and includes a mounting seat and a movable frame. The mounting seat is fixedly arranged on the non-seismic isolation soil body, and the movable frame is movably arranged on the mounting seat; in the separated state and the free state, the movable frame is in the free state, and in the squeezed state, the movable frame is squeezed and approaches the non-seismic isolation soil body; The anti-falling plate is fixedly arranged on the mounting seat and mounted on the movable frame. In the separated state, the free end of the cover plate structure is overlapped on the anti-falling plate; the reset mechanism is arranged between the mounting seat and the movable frame to drive the movable frame to reset.

[0008] Further, the anti-fall plate includes a mounting member and a deformable member, the mounting member is fixedly mounted on the mounting seat, the deformable member is movably connected to the mounting member, the deformable member includes continuously arranged deformable units, a plurality of the deformable units are arranged in parallel, and adjacent deformable units are movably connected; In the separated state and the free state, the deformable member is in a horizontal state and supports the free end of the cover plate structure. In the squeezed state, the deformable member is deformed and hangs freely.

[0009] Furthermore, the cover plate structure includes a cover plate and a lap plate, the connecting end of the cover plate is connected to the seismic isolation building structure, and the connecting end of the lap plate is movably arranged with the free end of the cover plate; in a free state, the free end of the lap plate is lapped on the lap support structure, and the surfaces of the cover plate and the lap plate are flush.

[0010] Furthermore, the connecting end of the cover plate is connected to the seismic isolation building structure through a guide member, the guide member includes a connecting bolt and a guide plate, the cover plate is provided with a connecting hole, the connecting bolt and the guide plate are located in the connecting hole, the cover plate is connected to the seismic isolation building structure through the connecting bolt, and the guide plate is fixedly arranged on the seismic isolation building structure; in the extrusion state, the guide plate guides the movement direction of the cover plate.

[0011] Furthermore, a limiting plate is provided between the lap plate and the cover plate, and the limiting plate is provided at the connecting end of the lap plate to limit the free drooping angle of the lap plate.

[0012] Furthermore, the overlap support structure includes a bracket and an overlap panel, the overlap panel is arranged on the non-seismic isolation soil through the bracket, the overlap panel is in a continuous stepped shape, including a bottom overlap surface, a sliding surface and a top overlap surface, the sliding surface is inclined and connects the bottom overlap surface and the top overlap surface; In a free state, the cover plate is located on the bottom lap surface, the lap plate is located on the top lap surface, and the cover plate and the lap plate are in a horizontal state; In the separated state, the lap plate hangs freely, and the angle between the plate surface and the sliding surface is an acute angle.

[0013] Furthermore, the movable frame is tilted, and the angle between it and the inner wall of the seismic isolation joint is 30°-60°.

[0014] Furthermore, a pulley is provided at the outer end of the movable frame, and the pulley is arranged horizontally.

[0015] Preferably, the reset mechanism is a spring, and a plurality of groups of the springs are arranged at intervals up and down.

[0016] The beneficial effects of the present invention are as follows: By using the combination of the cover plate structure and the anti-fall structure, the overall space occupied by the seismic isolation joint system is reduced by d, and it is ensured that the seismic isolation joint still has sufficient sliding space when an earthquake occurs, without affecting the seismic isolation effect of the seismic isolation joint, and at the same time, it will not cause the cover plate to fall, be crushed or warp too high within the normal sliding range; When the seismic isolation joint is separated and widened, the anti-falling structure is used to support the cover plate structure, the anti-falling structure arranged in the seismic isolation joint is used to achieve support, and the seismic isolation joint is used to compensate for the overlap length, thereby reducing the overlap length on the non-seismic isolation soil, thereby reducing the overall space occupation of the seismic isolation joint system; The anti-fall structure realizes the functions of support and overlap in a free state. It deforms and shortens after being squeezed, which does not affect the seismic isolation effect of the seismic isolation joint. The anti-fall structure has an automatic reset function, which enables the entire seismic isolation joint system to automatically reset after an earthquake, which not only has little impact on traffic but also has low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the seismic isolation joint of the present invention in a separated state; Figure 3 It is a structural schematic diagram of the seismic isolation joint of the present invention in a squeezed state; Figure 4 It is a structural schematic diagram of the cover plate structure of the present invention; Figure 5 It is a structural schematic diagram of the overlapping support structure of the present invention; Figure 6 It is a schematic side view of the overlapping support structure of the present invention; Figure 7 It is a structural schematic diagram of the anti-falling structure of the present invention; Figure 8 It is a structural schematic diagram of the anti-falling plate of the present invention; Fig. 9 It is a structural schematic diagram of the anti-fall frame of the present invention; Fig.10 It is a structural schematic diagram of the mounting member of the present invention; Fig.11 It is a schematic structural diagram of the deformation member of the present invention.

[0018] : 1. Cover plate structure; 11. Cover plate; 12. Overlap plate; 13. Guide member; 131. Connecting bolt; 132. Guide plate; 14. Limiting plate; 2. Overlap support structure; 21. Bracket; 22. Overlap panel; 221. Bottom overlap surface; 222. Sliding surface; 223. Top overlap surface; 3. Anti-fall structure; 31. Anti-fall plate; 311. Mounting member; 312. Deformation member; 32. Anti-fall frame; 321. Mounting seat; 322. Movable frame; 33. Reset mechanism. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figure 1 , 2 As shown in 3, a seismic isolation joint system with a short lap length is arranged in the seismic isolation joint between the seismic isolation building structure and the non-seismic isolation soil body. The seismic isolation joint system includes a cover plate structure 1, a lap support structure 2 and an anti-fall structure 3. The cover plate structure 1 covers the seismic isolation joint, the connecting end of the cover plate structure 1 is connected to the seismic isolation building structure, and the free end is lapped on the non-seismic isolation soil body. The free end of the cover plate structure 1 slides freely.

[0022] The lap support structure 2 is arranged on the non-seismic isolation soil, and the anti-fall structure 3 is arranged in the seismic isolation joint; in the free state, the free end of the cover structure 1 is located on the lap support structure 2, in the extruded state, the free end of the cover structure 1 slides on the lap support structure 2, and in the separated state, the free end of the cover structure 1 is located on the anti-fall structure 3.

[0023] Preferably, the length of the anti-falling structure 3 itself is d. In the free state and the separated state, the anti-falling structure 3 is in the free state. At this time, the length of the anti-falling structure 3 is its own length, that is, d. When a rare earthquake occurs and the seismic isolation joint undergoes the maximum deformation d in the separated state, the anti-falling structure 3 can still support and overlap the cover structure 1 and will not cause the cover structure 1 to fall. In this case, normal traffic can still be passed above the cover structure 1; after the anti-falling structure 3 is completely squeezed, its length is less than Ld. At this time, the anti-falling structure 3 will not be squeezed and destroyed by the deformed soil. After the earthquake, the anti-falling structure 3 can automatically reset and continue to be used normally. The length variation range of the anti-falling structure 3 is Ld~d.

[0024] Furthermore, the length of the cover plate 11 is d+50mm, L≤d+50; preferably, L<d+50, so that in the free state, the free end of the cover plate structure 1 is located on the lap support structure 2. When an earthquake occurs, the maximum displacement of the earthquake joint is d. When the earthquake joint is separated, the cover plate 11 is supported and overlapped by the anti-falling plate 31 with a length of d below it, which can prevent the cover plate 11 from falling; when the earthquake joint is squeezed, the cover plate 11 moves toward the lap support structure 2, and because the sliding surface 222 of the slope surface is tilted upward, the cover plate 11 is prevented from being squeezed and damaged.

[0025] like Figure 1 , 2 As shown in Figures 3 and 4, the specific working principle of the present invention is as follows: the connection end of the cover plate structure 1 is movably connected to one side of the seismic isolation building structure of the seismic isolation joint, and the other end is a free end. The free end can slide freely on the lap support structure 2 located on the non-seismic isolation soil side of the seismic isolation joint. The anti-fall structure 3 arranged in the seismic isolation joint can overlap and support the cover plate structure 1 when an earthquake occurs, thereby achieving compensation for the lap length and reducing the overall space occupancy of the seismic isolation system; in the free state, the free end of the cover plate structure 1 overlaps the lap support structure 2, ensuring the flatness and continuity of the surface of the seismic isolation joint. When an earthquake occurs, when the earthquake causes the seismic isolation joint to separate, the cover plate structure 1 moves together with the seismic isolation building structure, and the cover plate structure 1 The free end moves from the lap support structure 2 to the anti-fall structure 3, and the cover structure 1 is supported by the anti-fall structure 3 to prevent the cover structure 1 from falling into the seismic isolation joint, and by controlling the length of the anti-fall structure 3, the cover structure 1 can still be supported in the event of a rare earthquake; when the seismic isolation joint is squeezed due to an earthquake, the free end of the cover structure 1 moves toward the lap support structure 2 and is lifted up through the sliding surface 222 of the lap support structure 2, and the cover structure 1 will not be squeezed and broken, and the anti-fall structure 3 arranged in the seismic isolation joint will be squeezed and deformed due to its structural design and length control, but will not be damaged, and will automatically reset after the earthquake to continue to support the cover structure 1.

[0026] like Figure 7 , 8 As shown in Figures 9 and 10, further, the anti-fall structure 3 includes an anti-fall plate 31, an anti-fall frame 32 and a reset mechanism 33. The anti-fall frame 32 is arranged in the seismic isolation joint, and includes a mounting seat 321 and a movable frame 322. The mounting seat 321 is fixedly arranged on the non-seismic isolation soil body, and the movable frame 322 is movably arranged on the mounting seat 321. The movable frame 322 is vertically arranged, and its inner end is movably connected to the mounting seat 321. The movable frame 322 can rotate around the axis on the mounting seat 321 to achieve folding and unfolding; in the separated state and the free state, the movable frame 322 is in the free state, at which time the movable frame 322 is unfolded, and in the squeezed state, the movable frame 322 is squeezed and approaches the non-seismic isolation soil body, at which time the movable frame 322 is folded.

[0027] The specific working principle of the anti-fall structure 3 is as follows: in the free state and the separated state, the anti-fall frame 32 is in the expanded state driven by the reset mechanism 33, and at this time, the anti-fall plate 31 located above the anti-fall frame 32 is supported by the anti-fall frame 32 and is also in a horizontal state. At this time, the anti-fall plate 31 can support the cover structure 1 above it; in the extrusion state, the anti-fall frame 32 is squeezed by the seismic isolation building structure and moves toward the side of the non-seismic isolation soil to fold, thereby reducing the length to reduce the space occupancy, and at this time, after there is no support below the anti-fall plate 31, it freely droops under the action of its own gravity and will not be squeezed and crushed; after the earthquake, when the seismic isolation joint is reset, the anti-fall frame 32 is automatically deployed under the action of the reset mechanism 33, and the anti-fall frame 32 will support and push up the anti-fall plate 31 above it during the deployment process, so that the anti-fall plate 31 is also deployed synchronously.

[0028] like Figure 7 As shown, further, the anti-fall frame 32 is arranged at intervals below the anti-fall plate 31, and the anti-fall plate 31 above it is supported by the movable frame 322 of the anti-fall frame 32. The movable frame 322 has a supporting function on the anti-fall plate 31. When the movable frame 322 is folded inward, the deformation units of the anti-fall plate 31 lack support and droop one by one. When the movable frame 322 is unfolded outward, the movable frame 322 pushes open the deformation units one by one from the inside out and supports them, so that the anti-fall plate 31 is in a horizontal state.

[0029] The anti-fall plate 31 is fixed on the mounting seat 321 and mounted on the movable frame 322; in the separated state, the anti-fall plate 31 is in a horizontal state and is flush with the bottom overlapping surface 221, and the free end of the cover structure 1 is overlapped on the anti-fall plate 31; the reset mechanism 33 is arranged between the mounting seat 321 and the movable frame 322, driving the movable frame 322 to reset and keep the movable frame 322 stable.

[0030] like Figure 2 , 3 , 8, 10, and 11, further, the anti-fall plate 31 has a horizontal state and a free hanging state. When the anti-fall frame 32 is in the unfolded state, the anti-fall plate 31 is in a horizontal state through the support of the anti-fall frame 32. As the anti-fall frame 32 is gradually folded, the anti-fall plate 31 is deformed from the horizontal state to the free hanging state from the outer end; the anti-fall plate 31 includes a mounting member 311 and a deformation member 312, the mounting member 311 is fixedly mounted on the mounting seat 321, the deformation member 312 is movably connected to the mounting member 311, and the deformation member 312 includes continuously arranged deformation units, a plurality of the deformation units are arranged in parallel, the innermost deformation unit is movably connected to the mounting member 311, and adjacent deformation units are movably connected.

[0031] In the separated state and the free state, the deformable member 312 is in a horizontal state and supports the free end of the cover plate structure 1 . In the squeezed state, the deformable member 312 is deformed and hangs freely.

[0032] like Figure 8 , 10 As shown in FIG. 11 , further, a connecting shaft is provided on the outer side of the mounting member 311 , a connecting groove is provided on the inner side of the deformation unit, and a connecting shaft is provided on the outer side of the deformation unit. The connecting shaft is arranged in the connecting groove and can rotate in the connecting groove.

[0033] like Figure 4 As shown, further, the cover plate structure 1 includes a cover plate 11 and a lap plate 12, the connection end of the cover plate 11 is connected to the seismic isolation building structure, and when squeezed, the cover plate 11 will be lifted up with the connection end as a fulcrum, and the connection end of the lap plate 12 is movably arranged with the free end of the cover plate 11; in the free state, the free end of the lap plate 12 is overlapped on the lap support structure 2, and the surfaces of the cover plate 11 and the lap plate 12 are flush.

[0034] like Figure 4 As shown, further, the connecting end of the cover plate 11 is connected to the seismic isolation building structure through a guide member 13, and the guide member 13 includes a connecting bolt 131 and a guide piece 132. A connecting hole is provided on the cover plate 11, and the connecting hole is an elongated hole facing inside and outside. The connecting bolt 131 and the guide piece 132 are arranged in parallel inside and outside in the connecting hole, and the connecting bolt 131 and the guide piece 132 are in contact with the hole walls on both sides of the connecting hole. There is a gap between the connecting bolt 131 and the guide piece 132 and the hole walls at both ends of the connecting hole. The cover plate 11 is connected to the seismic isolation building structure through the connecting bolt 131, and the guide piece 132 is fixedly arranged on the seismic isolation building structure; in the extruded state, the guide piece 132 guides the movement direction of the cover plate 11.

[0035] In the separated state and the free state, the cover plate 11 is in a horizontal state. At this time, the connecting bolt 131 and the guide piece 132 are arranged side by side inside and outside in the connecting hole. The cover plate 11 is restricted on the seismic isolation building structure by the connecting bolt 131. In the extrusion state, when the free end of the cover plate 11 moves along the sliding surface 222, the free end will warp. At this time, the connecting end of the cover plate 11 will also warp. Therefore, the connecting hole is set as a long hole. When the cover plate 11 is warped, there will be no interference between the connecting hole and the connecting bolt 131. When the cover plate 11 is warped, the hole wall of the connecting hole contacts with the guide piece 132, and the cover plate moves along the guide piece 132. Through the cooperation between the guide piece 132 and the connecting hole, the cover plate 11 is restricted from warping in the inward and outward directions without deviation.

[0036] Furthermore, the lap plate 12 is movably connected to the free end of the cover plate 11, and a limit plate 14 is provided between the lap plate 12 and the cover plate 11. The limit plate 14 is provided at the connection end of the lap plate 12, that is, at the connection position between the lap plate 12 and the cover plate 11. After the lap plate 12 is separated from the top lap surface 223, the free drooping angle of the lap plate 12 is limited by the limit plate 14.

[0037] Furthermore, the guide piece 132 and the limiting piece 14 are both triangular structures.

[0038] like Figure 5 , 6 As shown, further, the lap support structure 2 includes a bracket 21 and a lap panel 22, and the lap panel 22 is set on the non-seismic isolation soil through the bracket 21. The lap panel 22 is a continuous stepped structure, including a bottom lap surface 221, a sliding surface 222 and a top lap surface 223. The sliding surface 222 is inclined, and the upper and lower ends of the sliding surface 222 are connected to the bottom lap surface 221 and the top lap surface 223.

[0039] In a free state, the cover plate 11 is located on the bottom lap surface 221, the lap plate 12 is located on the top lap surface 223, and the cover plate 11 and the lap plate 12 are in a horizontal state; In the separated state, the lap plate 12 hangs freely, and the angle between the plate surface and the lower side of the sliding surface 222 is an acute angle. When the lap plate 12 moves toward the sliding surface 222, the lap plate 12 moves upward along the sliding surface 222.

[0040] like Figure 7 As shown, further, the movable frame 322 is tilted, and the angle between it and the inner wall of the seismic isolation joint is 45°.

[0041] like Fig. 9 As shown, further, a pulley is provided at the outer end of the movable frame 322, and the pulley is horizontally arranged at the outermost end of the movable frame 322. When the seismic isolation building structure squeezes the movable frame 322, the pulley on the outer side is first contacted, and the pulley plays a role in reducing friction, so that the movable frame 322 can be smoothly folded when squeezed.

[0042] Furthermore, a limiting bar is provided on the mounting seat 321, and the limiting bar is provided to limit the movable frame 322 to be in a 45° state when unfolded.

[0043] Preferably, the reset mechanism 33 is a spring, and a plurality of springs are arranged at intervals up and down.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

Claims

1. A seismic isolation joint system with a short overlap length, arranged in a seismic isolation joint between a seismic isolation building structure and a non-seismic isolation soil body, characterized by: The invention comprises a cover plate structure (1), an overlap support structure (2) and an anti-fall structure (3), wherein the cover plate structure (1) covers the seismic isolation joint, the connection end of the cover plate structure (1) is connected to the seismic isolation building structure, the free end is overlapped on the non-seismic isolation soil body, and the free end of the cover plate structure (1) slides freely; the overlap support structure (2) is arranged on the non-seismic isolation soil body, and the anti-fall structure (3) is arranged in the seismic isolation joint; In the extruded state and the free state, the cover plate structure (1) is located on the overlapping support structure (2); in the separated state, the free end of the cover plate structure (1) is located on the anti-fall structure (3); In the free state and the separated state, the anti-falling structure (3) is in the free state, and its length is not less than d; after the anti-falling structure (3) is completely squeezed, its length is less than Ld.

2. The seismic isolation joint system with short overlap length according to claim 1, characterized in that: The anti-falling structure (3) comprises an anti-falling plate (31), an anti-falling frame (32) and a reset mechanism (33); the anti-falling frame (32) is arranged in the seismic isolation joint and comprises a mounting seat (321) and a movable frame (322); the mounting seat (321) is fixedly arranged on the non-seismic isolation soil body, and the movable frame (322) is movably arranged on the mounting seat (321); in the separated state and the free state, the movable frame (322) is in the free state; in the squeezed state, the movable frame (322) is squeezed and approaches the non-seismic isolation soil body; The anti-falling plate (31) is fixedly arranged on the mounting seat (321) and mounted on the movable frame (322); in a separated state, the free end of the cover plate structure (1) overlaps the anti-falling plate (31); the reset mechanism (33) is arranged between the mounting seat (321) and the movable frame (322) to drive the movable frame (322) to reset.

3. The short overlap length seismic isolation joint system according to claim 2, characterized in that: The anti-fall plate (31) comprises a mounting member (311) and a deformable member (312), wherein the mounting member (311) is fixedly mounted on a mounting seat (321), and the deformable member (312) is movably connected to the mounting member (311), and the deformable member (312) comprises continuously arranged deformable units, wherein a plurality of the deformable units are arranged in parallel, and adjacent deformable units are movably connected to each other; In the separated state and the free state, the deformable member (312) is in a horizontal state and supports the free end of the cover plate structure (1); in the squeezed state, the deformable member (312) is deformed and freely droops.

4. The short overlap length seismic isolation joint system according to claim 1, characterized in that: The cover plate structure (1) comprises a cover plate (11) and a lap plate (12); the connection end of the cover plate (11) is connected to the seismic isolation building structure, and the connection end of the lap plate (12) is movably arranged with the free end of the cover plate (11); in a free state, the free end of the lap plate (12) is lapped on the lap support structure (2), and the surfaces of the cover plate (11) and the lap plate (12) are flush.

5. The seismic isolation joint system with short overlap length according to claim 4 is characterized in that: The connecting end of the cover plate (11) is connected to the seismic isolation building structure via a guide member (13); the guide member (13) comprises a connecting bolt (131) and a guide plate (132); a connecting hole is provided on the cover plate (11); the connecting bolt (131) and the guide plate (132) are located in the connecting hole; the cover plate (11) is connected to the seismic isolation building structure via the connecting bolt (131); the guide plate (132) is fixedly arranged on the seismic isolation building structure; in an extruded state, the guide plate (132) guides the movement direction of the cover plate (11).

6. The seismic isolation joint system with short overlap length according to claim 4, characterized in that: A limiting plate (14) is provided between the lap plate (12) and the cover plate (11); the limiting plate (14) is provided at the connection end of the lap plate (12) to limit the free drooping angle of the lap plate (12).

7. The short overlap length seismic isolation joint system according to claim 4, characterized in that: The overlapping support structure (2) comprises a bracket (21) and an overlapping panel (22); the overlapping panel (22) is arranged on a non-seismic isolation soil body through the bracket (21); the overlapping panel (22) is in a continuous stepped shape, comprising a bottom overlapping surface (221), a sliding surface (222) and a top overlapping surface (223); the sliding surface (222) is arranged obliquely and connects the bottom overlapping surface (221) and the top overlapping surface (223); In a free state, the cover plate (11) is located on the bottom overlap surface (221), the overlap plate (12) is located on the top overlap surface (223), and the cover plate (11) and the overlap plate (12) are in a horizontal state; In the separated state, the lap plate (12) hangs freely, and the angle between the plate surface and the sliding surface (222) is an acute angle.

8. The short overlap length seismic isolation joint system according to claim 2, characterized in that: The movable frame (322) is tilted, and the included angle between it and the inner wall of the seismic isolation joint is 30°-60°.

9. The short overlap length seismic isolation joint system according to claim 2, characterized in that: The outer end of the movable frame (322) is provided with a pulley, and the pulley is arranged horizontally.

10. The short overlap length seismic isolation joint system according to claim 2, characterized in that: The reset mechanism (33) is a spring, and the spring is arranged at intervals up and down.

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