A longitudinal fall arrest device for a simply supported bridge under earthquake action

Abstract

The present invention discloses a longitudinal anti-fall device for a simply supported bridge under earthquake action, which relates to the technical field of bridge anti-falling, and solves the problems of insufficient buffering and energy consumption capacity of the existing longitudinal anti-falling beam device for simply supported bridges, as well as complex anchoring structure and high cost. A longitudinal anti-fall device for a simply supported bridge under earthquake action comprises an abutment, the upper end surface of the abutment is installed with an abutment cap, the upper end surfaces of every two abutments are installed with a bridge plate, and the front and rear of the opposite sides of the outer surfaces of every two abutments are provided with a first base, and the opposite sides of the outer surfaces of every two first bases are provided with a plurality of solar panels. The present invention has higher seismic resistance and better safety and stability by providing a first buffer mechanism and a second buffer mechanism, and is provided with a movable limiting mechanism, so that the horizontal plate, the vertical plate and the first buffer mechanism can be replaced conveniently after damage, thereby improving maintenance efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bridge fall prevention, in particular to a longitudinal fall prevention device for a simply supported bridge under earthquake action. Background Art

[0002] A simply supported bridge is a beam bridge with a beam supported at both ends on a movable support and a hinged support as the main load-bearing structure. A simply supported beam is a statically determinate structure, and each adjacent span is subjected to force independently. The structural force is relatively simple and is not affected by the displacement of the support. It is suitable for various geological conditions, has a simple structure, and is easy to make into standardized and assembled components. It is convenient to manufacture and install. It is the most widely used beam bridge. In high-intensity earthquake zones, simply supported bridges are at risk of beam falling when an earthquake occurs.

[0003] Beam fall is the most serious type of bridge damage caused by earthquakes. According to domestic and foreign bridge damage surveys, beam fall disasters caused by excessive earthquake displacement of bridge superstructures are relatively common. As the last line of defense in the beam fall prevention system, the anti-beam fall device must ensure that the bridge structure does not fall under the action of an unexpected earthquake.

[0004] However, the existing longitudinal anti-falling beam devices for simply supported bridges have insufficient buffering and energy dissipation capabilities, and the anchoring structure is complex and the cost is high; therefore, it does not meet the existing needs. In this regard, we propose a longitudinal anti-falling device for simply supported bridges under earthquake action. Summary of the invention

[0005] The purpose of the present invention is to provide a longitudinal anti-fall device for a simply supported bridge under earthquake action, so as to solve the problems of insufficient buffering and energy dissipation capacity, complex anchoring structure and high cost of the existing longitudinal anti-fall device for simply supported bridges proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a longitudinal stop device for a simply supported bridge under earthquake action, comprising an abutment, an abutment cap is installed on the upper end surface of the abutment, a bridge plate is installed on the upper end surfaces of every two abutments, a first base is arranged in front and rear of the opposite side of the outer surface of every two abutments, a plurality of solar panels are installed on the opposite side of the outer surfaces of every two first bases, a second base is arranged at the four end corners of the lower end surface of the bridge plate, and a mounting groove is arranged on the outer surface of the first base and the lower end surface of the second base. The inner side of the mounting groove is movably provided with a vertical plate and a horizontal plate through a movable limiting mechanism, the vertical plate is provided with a vertical groove at the front and rear of one side of the outer surface of the vertical plate, a sliding seat is slidably provided on the inner side of the vertical groove, the upper end surface and the lower end surface of the sliding seat are connected to the inner wall of the vertical groove through a second buffer mechanism, a fixed seat is fixedly installed at the front and rear of the lower end surface of the horizontal plate, an insertion rod is fixedly installed on the opposite side of the outer surface of every two sliding seats and every two fixed seats, a chain is sleeved on the outer surface of the insertion rod, and every two chains are fixedly connected by a first buffer mechanism.

[0007] Preferably, a plurality of anchor bars are installed on the outer surface of the first base, all of which are pre-buried in the interior of the abutment along the transverse direction of the abutment, and a plurality of anchor bars are installed on the upper end surface of the second base, all of which are pre-buried in the interior of the bridge slab along the vertical direction of the bridge slab.

[0008] Preferably, the second buffer mechanism consists of a top plate, a damping spring and a bottom plate, damping springs are installed on the front and rear of the bottom surface of the top plate, and the bottom end of the damping spring is installed on the bottom plate, the bottom plate is fixedly connected to the inner wall of the vertical groove, the top plate is fixedly connected to the outer surface of the sliding seat, T-shaped blocks are installed on the front and rear end surfaces of the sliding seat, the front and rear end surfaces of the inner wall of the vertical groove are both provided with T-shaped slots, and the T-shaped blocks are stuck in the inner side of the T-shaped slots.

[0009] Preferably, the movable limiting mechanism includes a short shaft, both ends of the short shaft are fixedly connected with threaded rods, the outer surface of the threaded rod is sleeved with a threaded plate, and clamping blocks are installed on the opposite sides of the outer surfaces of the two threaded plates, and the upper end surface and lower end surface of the vertical plate and both sides of the outer surface of the horizontal plate are provided with clamping grooves, and the clamping blocks can be clamped into the inner side of the clamping grooves.

[0010] Preferably, the short shaft and the threaded rod are arranged on one side of the mounting groove through a transverse groove, the transverse groove and the mounting groove are connected through a through groove, the threaded plate can slide on the inner side of the through groove, and the thread directions of the two threaded rods are opposite.

[0011] Preferably, a motor is installed on one side of the transverse groove through a motor cavity, the output end of the motor is fixedly connected to one end of one of the threaded rods through a short shaft, the other end of the other threaded rod is rotatably connected to the inner wall of the transverse groove through a bearing, a battery and a power conversion module are installed inside the vertical plate through a cavity, the solar panel is electrically connected to the battery and the power conversion module, and the battery is electrically connected to the motor.

[0012] Preferably, the first buffer mechanism comprises a sliding rod and an outer sleeve, fixing rods are fixedly installed on both sides of the inner side of the outer sleeve, the outer surfaces of the fixing rods are sleeved with a first spring, and the outer surfaces of the two fixing rods are sleeved with movable plates.

[0013] Preferably, grooves are provided on both sides of the outer surface of the movable plate, a second spring is fixedly installed on the inner wall of the groove, a connecting rod is provided at the other end of the second spring, a roller is sleeved on the other end of the connecting rod, and a plurality of buffer grooves are opened on the inner wall of the outer sleeve.

[0014] Preferably, the sliding rod passes through the outer sleeve, the sliding rod is fixedly connected to the outer surface of the movable plate, the roller can be stuck in the inner side of the buffer groove, the second spring is fixedly connected to a limiting plate at one end close to the connecting rod, the limiting plate is stuck in the inner side of the groove, and the limiting plate is fixedly connected to the connecting rod, and the surface of the roller is movably connected to the connecting rod through a rotating shaft.

[0015] Preferably, the chain is a circular chain formed by connecting several high-strength steel rings in sequence, the high-strength steel rings are connected to the insertion rod, and the front and rear outer surfaces of the insertion rod are fixedly connected to limit rings, and the outer surface of the limit rings is covered with a silicone pad.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention is provided with a first buffer mechanism and a second buffer mechanism. When an earthquake occurs, the longitudinal displacement of the bridge plate and the abutment reaches the maximum value. The chain is first straightened, and then the sliding rod is extended and retracted inside the outer sleeve, driving the movable plate to slide on the surface of the fixed rod, and the first spring is deformed. The movable plate moves to drive the roller to move inside the buffer groove. The roller moves to drive the connecting rod to move. The connecting rod moves to drive the limit plate to slide. The movement of the limit plate causes the second spring to deform, thereby achieving buffering energy consumption and preventing the bridge plate from being damaged and falling. The use is more stable. At the same time, the sliding seat moves up and down inside the vertical groove, and the damping spring is deformed, thereby further buffering the impact tension. The present invention is provided with a first buffer mechanism and a second buffer mechanism, so that the seismic resistance is higher and the safety and stability performance is better.

[0018] 2. The present invention is provided with anchor bars and pre-buried anchor bars so that the first base and the second base can be stably connected to the abutment and the bridge plate respectively. By providing a movable limiting mechanism, the vertical plate and the horizontal plate can be disassembled and assembled, so that they can be replaced conveniently after they are damaged. The solar panel absorbs light energy, and the power generated by the solar panel is obtained through the power conversion module to charge the battery and provide power for the motor. The motor can drive the threaded rod to rotate, and the two threaded plates simultaneously move in opposite directions away from each other, driving the block to move. The block leaves the inner side of the slot, releasing the limit on the vertical plate and the horizontal plate, so that the vertical plate and the horizontal plate can be removed from the inner side of the mounting slot and replaced. The present invention is provided with a movable limiting mechanism, so that the horizontal plate, the vertical plate and the first buffer mechanism can be replaced conveniently after they are damaged, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the base of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the vertical plate and the horizontal plate of the present invention;

[0022] Figure 4 It is a partial structural schematic diagram of the plug rod of the present invention;

[0023] Figure 5 It is a main cross-sectional view of the vertical plate and the horizontal plate of the present invention;

[0024] Figure 6 It is a partial structural schematic diagram of the first buffer mechanism of the present invention;

[0025] Figure 7 It is a schematic diagram of the local structure of the movable plate of the present invention.

[0026] In the figure: 1, bridge plate; 2, abutment; 3, abutment cap; 4, first base; 5, solar panel; 6, vertical plate; 7, sliding seat; 8, first buffer mechanism; 801, sliding rod; 802, outer sleeve; 803, buffer groove; 804, fixed rod; 805, first spring; 806, movable plate; 807, roller; 808, groove; 809, second spring; 810, connecting rod; 9, chain; 10, horizontal plate; 11, fixed seat; 12, plug rod; 13, limiting ring; 14, movable limiting mechanism; 1401, threaded rod; 1402, threaded plate; 1403, short shaft; 1404, horizontal groove; 1405, through groove; 1406, clamping groove; 1407, clamping block; 15, second buffer mechanism; 16, vertical groove; 17, mounting groove; 18, anchor bar; 19, second base. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] The motor (model 68KTYZ) mentioned in the present invention can be purchased from the market or obtained through private customization.

[0029] See also Figures 1 to 7 , an embodiment of the present invention: a longitudinal stop device for a simply supported bridge under earthquake action, comprising an abutment 2, an abutment cap 3 is installed on the upper end surface of the abutment 2, a bridge plate 1 is installed on the upper end surfaces of every two abutments 3, a first base 4 is arranged in front and rear of the opposite side of the outer surface of every two abutments 2, a plurality of solar panels 5 are installed on the opposite side of the outer surface of every two first bases 4, a second base 19 is arranged at the four end corners of the lower end surface of the bridge plate 1, the outer surface of the first base 4 and the lower end surface of the second base 19 are both provided with a mounting groove 17, the inner side of the mounting groove 17 The vertical plate 6 and the horizontal plate 10 are movably arranged through the movable limiting mechanism 14 respectively, the vertical plate 6 is provided with a vertical groove 16 at the front and rear of one side of the outer surface, and a sliding seat 7 is slidably arranged on the inner side of the vertical groove 16, and the upper end surface and the lower end surface of the sliding seat 7 are connected to the inner wall of the vertical groove 16 through the second buffer mechanism 15, and a fixed seat 11 is fixedly installed at the front and rear of the lower end surface of the horizontal plate 10, and an insertion rod 12 is fixedly installed on the opposite side of the outer surface of every two sliding seats 7 and every two fixed seats 11, and the outer surface of the insertion rod 12 is sleeved with a chain 9, and every two chains 9 are fixedly connected by the first buffer mechanism 8.

[0030] A plurality of anchor bars 18 are installed on the outer surface of the first base 4, and all of the anchor bars 18 are pre-buried in the interior of the abutment 2 along the transverse direction of the abutment 2. A plurality of anchor bars 18 are installed on the upper end surface of the second base 19, and all of the anchor bars 18 are vertically buried in the interior of the bridge slab 1 along the bridge slab 1. The pre-buried anchor bars 18 enable the first base 4 and the second base 19 to be stably connected to the abutment 2 and the bridge slab 1, respectively.

[0031] The second buffer mechanism 15 is composed of a top plate, a damping spring and a bottom plate. Damping springs are installed on the front and back of the bottom surface of the top plate, and the bottom plate is installed on the bottom end of the damping spring. The bottom plate is fixedly connected to the inner wall of the vertical groove 16, and the top plate is fixedly connected to the outer surface of the sliding seat 7. T-shaped blocks are installed on the front and rear ends of the sliding seat 7. The front and rear ends of the inner wall of the vertical groove 16 are both provided with T-shaped grooves, and the T-shaped blocks are inserted into the inner side of the T-shaped grooves. The top plate and the bottom plate can provide installation support for the damping spring, so that the damping spring can play a shock-absorbing effect and improve the stability of the sliding seat 7 moving up and down.

[0032] The movable limiting mechanism 14 includes a short shaft 1403, and the two ends of the short shaft 1403 are fixedly connected with a threaded rod 1401. The outer surface of the threaded rod 1401 is sleeved with a threaded plate 1402. The two threaded plates 1402 are installed with a clamping block 1407 on the opposite side of the outer surface. The upper end surface and the lower end surface of the vertical plate 6 and the two sides of the outer surface of the horizontal plate 10 are provided with a clamping groove 1406, and the clamping block 1407 can be clamped into the inner side of the clamping groove 1406. The short shaft 1403 and The threaded rod 1401 is arranged on one side of the mounting groove 17 through a transverse groove 1404. The transverse groove 1404 is connected to the mounting groove 17 through a through groove 1405. The threaded plate 1402 can slide on the inner side of the through groove 1405. The thread directions of the two threaded rods 1401 are opposite. The two threaded plates 1402 can move towards or away from each other at the same time, driving the block 1407 to move, so that the block 1407 extends into or out of the inner side of the slot 1406.

[0033] A motor is installed on one side of the horizontal groove 1404 through the motor cavity, and the output end of the motor is fixedly connected to one end of one of the threaded rods 1401 through a short shaft, and the other end of the other threaded rod 1401 is rotatably connected to the inner wall of the horizontal groove 1404 through a bearing, and a battery and a power conversion module are installed inside the vertical plate 6 through a cavity, the solar panel 5 is electrically connected to the battery and the power conversion module, and the battery is electrically connected to the motor. The motor can drive the threaded rod 1401 to rotate when it works, and the solar panel 5 absorbs light energy, obtains the electricity produced by the solar panel through the power conversion module to charge the battery, and provides power for the motor.

[0034] The first buffer mechanism 8 includes a slide bar 801 and an outer sleeve 802 . Fixed rods 804 are fixedly installed on both sides of the outer sleeve 802 . The outer surfaces of the fixed rods 804 are sleeved with first springs 805 . The outer surfaces of the two fixed rods 804 are sleeved with movable plates 806 .

[0035] Grooves 808 are provided on both sides of the outer surface of the movable plate 806, and a second spring 809 is fixedly installed on the inner wall of the groove 808. A connecting rod 810 is provided at the other end of the second spring 809, and a roller 807 is sleeved on the other end of the connecting rod 810. A plurality of buffer grooves 803 are provided on the inner wall of the outer sleeve 802.

[0036] The slide bar 801 passes through the outer sleeve 802, and the slide bar 801 is fixedly connected to the outer surface of the movable plate 806. The roller 807 can be inserted into the inner side of the buffer groove 803. The second spring 809 is fixedly connected to a limiting plate at one end close to the connecting rod 810. The limiting plate is inserted into the inner side of the groove 808, and the limiting plate is fixedly connected to the connecting rod 810. The surface of the roller 807 is movably connected to the connecting rod 810 through a rotating shaft, so that the roller 807 can move in the buffer groove 803, thereby improving the rotation stability of the roller 807 and making the second spring 809 movable in the groove 808 to prevent it from falling off from the inner side of the groove 808.

[0037] The chain 9 is a circular chain formed by several high-strength steel rings connected in sequence. The high-strength steel rings are connected to the insertion rod 12. The front and rear outer surfaces of the insertion rod 12 are fixedly connected with limiting rings 13. The outer surface of the limiting ring 13 is covered with a silicone pad to ensure the strength of the chain 9. The limiting ring 13 can limit the chain 9 to prevent it from shaking. By providing a silicone pad, when the first buffer mechanism 8 is subjected to impact tension, the silicone pad is squeezed and deformed, thereby further buffering the impact tension.

[0038] When the longitudinal anti-fall device of the simply supported bridge under the action of earthquake is in use, anchor bars 18 are provided and pre-buried, so that the first base 4 and the second base 19 can be stably connected to the abutment 2 and the bridge plate 1 respectively. The first buffer mechanism 8 and the second buffer mechanism 15 are provided. When an earthquake occurs, the longitudinal displacement of the bridge plate 1 and the abutment 2 reaches the maximum value, the chain 9 is first straightened, and then the sliding rod 801 is retracted on the inner side of the outer sleeve 802, driving the movable plate 806 to slide on the surface of the fixed rod 804, and the first spring 805 is deformed. The movable plate 806 moves to drive the roller 807 to move inside the buffer groove 803, and the movement of the roller 807 drives the connecting rod 810 to move. The movement of the connecting rod 810 drives the limit plate to slide, and the movement of the limit plate causes the second spring 809 to deform, thereby achieving buffering energy consumption and preventing the bridge plate 1 from being damaged and falling, and the use is more stable. At the same time, the sliding seat 7 moves up and down on the inner side of the vertical groove 16, and the damping spring is deformed. The vertical plate 6 and the horizontal plate 10 can be disassembled and assembled by being provided with an active limiting mechanism 14, so as to facilitate replacement thereof after damage occurs. The solar panel 5 absorbs light energy, and obtains the electricity produced by the solar panel 5 through the power conversion module to charge the battery and provide power for the motor. The motor can drive the threaded rod 1401 to rotate, and the two threaded plates 1402 simultaneously move in opposite directions away from each other, driving the clamping block 1407 to move, and the clamping block 1407 leaves the inner side of the clamping groove 1406, releasing the limit on the vertical plate 6 and the horizontal plate 10, and the vertical plate 6 and the horizontal plate 10 can be removed from the inner side of the mounting groove 17 for replacement. The present invention has higher anti-seismic performance and better safety and stability performance by being provided with a first buffer mechanism 8 and a second buffer mechanism 15. By being provided with an active limiting mechanism 14, it is convenient to replace the horizontal plate 10, the vertical plate 6 and the first buffer mechanism 8 after damage, thereby improving maintenance efficiency.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A longitudinal fall arrest device for a simply supported bridge under earthquake action, comprising a bridge abutment (2), characterized in that: The upper end surface of the abutment (2) is provided with a cap (3), and the upper end surfaces of every two of the caps (3) are provided with a bridge plate (1). First bases (4) are provided at the front and rear of the opposite sides of the outer surfaces of every two abutments (2), and a plurality of solar panels (5) are provided at the opposite sides of the outer surfaces of every two of the first bases (4). Second bases (19) are provided at the four end corners of the lower end surface of the bridge plate (1), and the outer surface of the first base (4) and the lower end surface of the second base (19) are provided with mounting grooves (17), and the inner sides of the mounting grooves (17) are respectively provided with vertical plates (6) and vertical plates (7) through movable limiting mechanisms (14). A horizontal plate (10), a vertical groove (16) is arranged at the front and rear of one side of the outer surface of the vertical plate (6), a sliding seat (7) is slidably arranged on the inner side of the vertical groove (16), the upper end surface and the lower end surface of the sliding seat (7) are connected to the inner wall of the vertical groove (16) through a second buffer mechanism (15), a fixed seat (11) is fixedly installed at the front and rear of the lower end surface of the horizontal plate (10), and an insertion rod (12) is fixedly installed on the opposite side of the outer surface of every two of the sliding seats (7) and every two of the fixed seats (11), and the outer surface of the insertion rod (12) is sleeved with a chain (9), and every two of the chains (9) are fixedly connected through a first buffer mechanism (8).

2. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 1, characterized in that: The outer surface of the first base (4) is installed with a plurality of anchor bars (18), and all of the anchor bars (18) are pre-buried in the interior of the abutment (2) along the transverse direction of the abutment (2); the upper end surface of the second base (19) is installed with a plurality of anchor bars (18), and all of the anchor bars (18) are pre-buried in the interior of the bridge slab (1) along the vertical direction of the bridge slab (1).

3. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 1, characterized in that: The second buffer mechanism (15) is composed of a top plate, a damping spring and a bottom plate. Damping springs are installed at the front and rear of the bottom surface of the top plate, and the bottom end of the damping spring is installed with the bottom plate. The bottom plate is fixedly connected to the inner wall of the vertical groove (16). The top plate is fixedly connected to the outer surface of the sliding seat (7). T-shaped blocks are installed on the front and rear surfaces of the sliding seat (7). The front and rear surfaces of the inner wall of the vertical groove (16) are both provided with T-shaped grooves, and the T-shaped blocks are inserted into the inner side of the T-shaped grooves.

4. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 1, characterized in that: The movable limiting mechanism (14) comprises a short shaft (1403), the two ends of the short shaft (1403) are fixedly connected with a threaded rod (1401), the outer surface of the threaded rod (1401) is sleeved with a threaded plate (1402), and a clamping block (1407) is installed on the opposite side of the outer surface of the two threaded plates (1402), and the upper end surface and the lower end surface of the vertical plate (6) and the two sides of the outer surface of the horizontal plate (10) are provided with a clamping groove (1406), and the clamping block (1407) can be clamped into the inner side of the clamping groove (1406).

5. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 4, characterized in that: The short shaft (1403) and the threaded rod (1401) are arranged on one side of the mounting groove (17) via a transverse groove (1404); the transverse groove (1404) and the mounting groove (17) are connected via a through groove (1405); the threaded plate (1402) can slide inside the through groove (1405); and the thread directions of the two threaded rods (1401) are opposite.

6. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 5, characterized in that: A motor is installed on one side of the transverse groove (1404) through a motor cavity; the output end of the motor is fixedly connected to one end of one of the threaded rods (1401) through a short shaft; the other end of the other threaded rod (1401) is rotatably connected to the inner wall of the transverse groove (1404) through a bearing; a battery and a power conversion module are installed inside the vertical plate (6) through a cavity; the solar panel (5) is electrically connected to the battery and the power conversion module; and the battery is electrically connected to the motor.

7. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 1, characterized in that: The first buffer mechanism (8) comprises a sliding rod (801) and an outer sleeve (802), fixed rods (804) are fixedly installed on both sides of the inner side of the outer sleeve (802), the outer surface of the fixed rod (804) is sleeved with a first spring (805), and the outer surfaces of the two fixed rods (804) are sleeved with movable plates (806).

8. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 7, characterized in that: Grooves (808) are provided on both sides of the outer surface of the movable plate (806), a second spring (809) is fixedly installed on the inner wall of the groove (808), a connecting rod (810) is provided at the other end of the second spring (809), a roller (807) is sleeved on the other end of the connecting rod (810), and a plurality of buffer grooves (803) are provided on the inner wall of the outer sleeve (802).

9. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 8, characterized in that: The sliding rod (801) passes through the outer sleeve (802), and the sliding rod (801) is fixedly connected to the outer surface of the movable plate (806). The roller (807) can be inserted into the inner side of the buffer groove (803). One end of the second spring (809) close to the connecting rod (810) is fixedly connected to a limiting plate, and the limiting plate is inserted into the inner side of the groove (808). The limiting plate is fixedly connected to the connecting rod (810), and the surface of the roller (807) is movably connected to the connecting rod (810) via a rotating shaft.

10. The longitudinal fall arrest device for a simply supported bridge under earthquake action according to claim 1, characterized in that: The chain (9) is a circular chain formed by connecting a plurality of high-strength steel rings in sequence, the high-strength steel rings are connected to the insertion rod (12), the front and rear outer surfaces of the insertion rod (12) are fixedly connected to limit rings (13), and the outer surface of the limit ring (13) is covered with a silicone pad.

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