Anti-seismic concrete prefabricated stair

Abstract

The invention relates to the technical field of prefabricated stairs, and discloses an anti-seismic concrete prefabricated stair which comprises stair flight plates, low-end stair beams, high-end stair beams, buffer springs, vertical adjusting devices and transverse adjusting devices. The device has the following advantages and effects that when the controller judges that an earthquake occurs, the vertical adjusting device is controlled to adjust the upper sliding seat to descend, the pre-positioning supporting plate is separated from the vertical sliding hole after being stressed, and the pin roller of the lower sliding seat extends out of the vertical sliding hole to be in contact with the lower connecting steel plate; the transverse adjusting device drives the adjusting seat to move into the vertical sliding hole from the transverse sliding hole, the vertical adjusting device adjusts the upper sliding seat to ascend until the vertical adjusting device is separated from the upper end face of the upper sliding seat, and at the moment, the compressed buffer spring elastically supports the stair flight plate. When the stair flight plates are subjected to vertical earthquake action in the earthquake process, vertical moving space is provided through the buffer springs, damage to the stair flight plates is reduced, the anti-seismic performance is improved, an escape way in the earthquake is guaranteed as much as possible, and casualties are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated stairs, in particular to an earthquake-resistant concrete prefabricated staircase. Background Art

[0002] Stairs are components used for vertical transportation between floors in buildings. In multi-storey and high-rise buildings with elevators as the main means of vertical transportation, stairs should also be installed for escape in the event of fire, earthquake and other disasters. In earthquakes at home and abroad, stairs in buildings have suffered serious damage, such as stair collapse, node damage, stair slab damage, ladder beam and ladder column damage, etc., resulting in the closure of the escape route in the building.

[0003] There are precedents in the prior art for studying prefabricated stairs to improve seismic performance. Prefabricated concrete refers to processing and manufacturing in a prefabricated component factory, transporting qualified prefabricated components to the construction site, hoisting them with installation machinery, and then connecting the prefabricated components to the building through construction. It has the advantages of being less restricted by climate factors and less dust and noise at the construction site. In the prior art, the seismic function of prefabricated stairs is mainly to set a sliding support at the lower end of the prefabricated stairs, such as ATa and ATb in the national building standard design atlas "11G101-2". A sliding support is set between the lower end of the staircase plate and the low-end ladder beam, and the staircase plate is detached from the main structure of the building. When an earthquake occurs, the staircase plate and the main building can produce a slight displacement. It only needs to maintain the supporting enclosure structure of the stairwell from collapsing, which can reduce the damage to the stairs, and thus meet the evacuation of personnel during an earthquake as much as possible.

[0004] However, the sliding support of the above-mentioned prefabricated staircase has the following shortcomings in practical applications: Due to the structure of the sliding support, the lower end of the staircase can move horizontally within a certain range, and the staircase will be subject to rare lateral and longitudinal earthquakes, which can play a certain role in earthquake resistance. When an actual earthquake occurs, it may also be accompanied by vertical earthquakes. At this time, the sliding support cannot play a good role in earthquake resistance against vertical earthquakes. Therefore, the earthquake resistance performance of the prefabricated staircase still needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a seismic-resistant concrete prefabricated staircase with good seismic resistance.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an earthquake-resistant concrete prefabricated staircase, comprising a stair section plate, a low-end ladder beam, and a high-end ladder beam, wherein the low-end ladder beam is provided with a lower connecting steel plate, an upper connecting steel plate is provided at the lower end of the stair section plate, a viscoelastic layer is provided between the upper connecting steel plate and the lower connecting steel plate, a vertical sliding hole is provided at the lower end of the stair section plate, an upper sliding seat and a lower sliding seat are inserted into the vertical sliding hole, a buffer spring is connected between the upper sliding seat and the lower sliding seat, and the lower sliding seat is rotatably connected to a roller A pre-positioning support plate is provided at the lower end of the vertical sliding hole, and the pre-positioning support plate supports the roller. A transverse sliding hole is formed inside the lower end of the stair section plate, and one end of the transverse sliding hole is connected to the upper end side wall of the vertical sliding hole. An adjustment seat is slidably connected in the transverse sliding hole. The seismic prefabricated concrete staircase also includes a vertical adjustment device and a transverse adjustment device. The vertical adjustment device is used to drive the upper sliding seat to rise and fall, and the transverse adjustment device is used to drive the adjustment seat to enter the vertical sliding hole after the upper sliding seat descends.

[0007] By adopting the above technical solution, when an earthquake occurs, the upper connecting steel plate at the lower end of the stair section plate and the lower connecting steel plate between the low-end ladder beams can move horizontally to reduce the damage to the stair section plate.

[0008] Before an earthquake occurs, the pre-positioning support plate supports the lower sliding seat, the upper sliding seat and the buffer spring. At this time, the buffer spring is only affected by the gravity of the upper sliding seat, and the deformation is small. At this time, the buffer spring is in the standby stage, which is conducive to the long-term storage and standby of the buffer spring and avoids the performance degradation of the buffer spring.

[0009] When an earthquake occurs, the vertical adjusting device first causes the upper sliding seat to descend, driving the buffer spring, the lower sliding seat, and the roller to descend. The roller acts on the pre-positioning support plate and makes it disengage from the vertical sliding hole. The roller contacts the lower connecting steel plate, and the buffer spring undergoes a large deformation and is in a compressed state. The transverse adjusting device drives the adjusting seat to slide from the transverse sliding hole to the upper end of the vertical sliding hole. The vertical adjusting device then drives the upper sliding seat to rise so that it contacts the lower end of the adjusting seat, and the vertical adjusting device separates from the upper sliding seat. At this time, the upper end of the adjusting seat is against the inner wall of the upper end of the vertical sliding hole, and the lower end is against the upper end of the upper sliding seat. The large elastic force formed by the buffer spring acts on the lower connecting steel plate of the low-end ladder beam through the roller on the lower sliding seat. If the ladder section plate and the low-end ladder beam have vertical displacement, the buffer spring provides the displacement distance through deformation, thereby reducing the damage of the ladder section plate caused by the vertical earthquake, thereby realizing the function of improving the earthquake resistance performance.

[0010] The present invention is further configured as follows: the vertical adjustment device includes a scissors-type jack, an adjustment motor, and an adjustment arm; the scissors-type jack includes a screw and a load-bearing platform; the adjustment motor is used to drive the screw to rotate; one end of the adjustment arm is fixed to the load-bearing platform, and the other end extends into the vertical sliding hole and presses on the upper end surface of the upper sliding seat.

[0011] By adopting the above technical solution, the adjusting motor drives the screw to rotate, thereby driving the load-bearing platform of the scissor jack to rise and fall, thereby driving the adjusting arm to rise and fall, thereby realizing the function of adjusting the upper sliding seat to rise and fall. At the same time, the adjusting arm separates from the upper sliding seat after rising to a certain distance, thereby realizing the function of separating the above vertical adjustment device from the upper sliding seat.

[0012] The present invention is further configured as follows: the lateral adjustment device includes a vertical connecting rod, a push rod, a push plate, and a connecting spring, the vertical connecting rod is fixed on the load-bearing platform, the upper end of the push rod is hinged to the vertical connecting rod, one end of the connecting spring is fixed on the push rod, and the other end is fixed on the push plate, and the push plate is slidably connected to the lateral sliding hole.

[0013] By adopting the above technical solution, when the load-bearing platform descends, it drives the vertical connecting rod to descend, the vertical connecting rod drives the push rod to swing, and the push rod drives the connecting spring and the push plate to move, pushing the adjustment seat from the horizontal sliding hole to the vertical sliding hole.

[0014] The present invention is further configured as follows: the number of the vertical sliding holes is two and they are distributed at both ends of the lower end of the stair step plate; the number of the adjusting arms in the vertical adjusting device is two and they respectively correspond to the upper sliding seats in the two vertical sliding holes.

[0015] In the structural design of the vertical adjustment device, by setting the number of adjustment arms to two, the function of one scissor jack driving the movement of two adjustment arms can be achieved.

[0016] The present invention is further configured as follows: the number of the transverse sliding holes and the number of the adjustment seats are both two and correspond to the two vertical sliding holes respectively; the number of the push rods, push plates and connecting springs in the transverse adjustment device are both two and correspond to the two transverse sliding holes and the two adjustment seats respectively.

[0017] The present invention is further configured as follows: a receiving cavity is formed inside the lower end of the ladder section plate, and the scissor jack, the adjusting motor, and the vertical connecting rod are all located in the receiving cavity.

[0018] By adopting the above technical solution, the accommodating cavity provides space for installing and accommodating the scissor jack, the adjusting motor, and the vertical connecting rod, so that they are not exposed to the outside and affect the appearance of the prefabricated stairs.

[0019] The present invention is further configured as follows: the inner wall of the accommodating cavity, the inner wall of the transverse sliding hole, and the inner wall of the vertical sliding hole are all fixed steel plates, the stair section plate includes concrete and steel bars, and the fixed steel plates are welded and fixed to the steel bars.

[0020] By adopting the above technical solution, the fixed steel plate is fixed by welding to the steel bars inside the precast concrete staircase.

[0021] The present invention is further configured as follows: it also includes a controller, a first displacement sensor, and a second displacement sensor, the first displacement sensor is installed on the high-end ladder beam, the second displacement sensor is installed on the low-end ladder beam, and the first displacement sensor, the second displacement sensor, and the adjustment motor are all communicatively connected to the controller.

[0022] By adopting the above technical solution, when an earthquake occurs, the first displacement sensor and the second displacement sensor detect the displacement signal and transmit it to the controller. The controller analyzes the displacement signal and determines when an earthquake occurs, and then controls the operation of the regulating motor.

[0023] The present invention is further configured to include a battery pack, wherein the battery pack is used to supply power to the regulating motor, the controller, the first displacement sensor, and the second displacement sensor.

[0024] By adopting the above technical solution, before an earthquake occurs, the first displacement sensor, the second displacement sensor, and the controller are powered by the mains, and the power of the battery pack will not be consumed. When an earthquake occurs, since the mains line may be out of power, the mains power supply may be out of power at any time. Therefore, the present invention configures a battery pack for power supply. Considering that the regulating motor needs to work for a short time after an earthquake, when the battery pack is configured according to the actual situation, the battery capacity will not be very large, and its volume is not large, so it can be placed inside the accommodating cavity.

[0025] The present invention is further configured as follows: the pre-positioning support plate is adhesively fixed to the inner wall of the vertical sliding hole.

[0026] By adopting the above technical solution, the pre-positioning support plate is bonded and fixed to the inner wall of the lower end of the vertical sliding hole. Before the earthquake occurs, the force between the pre-positioning support plate and the vertical sliding hole can enable the pre-positioning support plate to support the roller, the lower sliding seat, the buffer spring, and the upper sliding seat. When the vertical adjustment device adjusts the upper sliding seat to descend, the pre-positioning support plate is separated from the inner wall of the vertical sliding hole after being subjected to the downward force.

[0027] The beneficial effects of the present invention are as follows: the first displacement sensor and the second displacement sensor detect displacement signals and transmit them to the controller. When the controller determines that an earthquake occurs, the controller controls the adjusting motor to rotate forward, drives the screw to rotate forward, drives the adjusting arm and the upper sliding seat to descend through the scissor jack, compresses the buffer spring, and the pre-positioning support plate is disengaged from the vertical sliding hole after being subjected to force. The roller of the lower sliding seat extends out of the vertical sliding hole and contacts the lower connecting steel plate. The lateral adjustment device drives the adjusting seat to move from the lateral sliding hole to the vertical sliding hole. The controller controls the adjusting motor to rotate reversely, drives the screw to rotate reversely, drives the adjusting arm and the upper sliding seat to rise through the scissor jack until the adjusting arm is separated from the upper end surface of the upper sliding seat. At this time, the elastic force of the compressed buffer spring acts on the ladder section plate upward through the upper sliding seat and the adjusting seat, and acts on the lower connecting steel plate of the low-end ladder beam downward through the lower sliding seat and the roller. When the ladder section plate is subjected to vertical earthquake action during an earthquake, a vertical activity space is provided through the buffer spring, thereby reducing damage to the ladder section plate, improving earthquake resistance, and protecting the escape passage in an earthquake as much as possible, thereby reducing casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the positional relationship between the low-end ladder beam and the lower connecting steel plate of the present invention.

[0031] Figure 3 It is a schematic diagram of the positional relationship between the stair section plate, the upper connecting steel plate, and the pre-positioning support plate of the present invention.

[0032] Figure 4 The cross-sectional structure of the lower end of the ladder section plate of the present invention is shown in FIG. Figure 1 , used to show the structural schematic diagram of the vertical adjustment device and the horizontal adjustment device.

[0033] Figure 5 It is a schematic diagram of the connection relationship between the adjustment arm and the lateral adjustment device of the present invention.

[0034] Figure 6 The cross-sectional structure of the lower end of the ladder section plate of the present invention is shown in FIG. Figure 2 , used to show the schematic diagram of the positional relationship between the vertical sliding hole, the upper sliding seat, and the adjusting arm.

[0035] Figure 7The cross-sectional structure of the lower end of the ladder section plate of the present invention is shown in FIG. Figure 3 , used to show the schematic diagram of the positional relationship between the accommodating cavity, the horizontal sliding hole, the vertical sliding hole, and the two through grooves.

[0036] In the figure, 1, ladder plate; 11, vertical sliding hole; 111, upper sliding seat; 112, lower sliding seat; 113, buffer spring; 114, roller; 115, pre-positioning support plate; 12, horizontal sliding hole; 121, adjustment seat; 122, limit groove; 13, accommodating cavity; 14, through groove; 15, upper connecting steel plate; 2, low-end ladder beam; 21, lower connecting steel plate; 3, high-end ladder beam; 4, vertical adjustment device; 41, scissor jack; 411, screw; 412, load-bearing platform; 42, adjustment motor; 43, adjustment arm; 5, horizontal adjustment device; 51, vertical connecting rod; 52, push rod; 53, connecting spring; 54, push plate; 541, limit block; 6, guide column; 7, battery pack. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0038] An earthquake-resistant precast concrete staircase, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a low-end ladder beam 2, a ladder section plate 1, and a high-end ladder beam 3. The low-end ladder beam 2 is provided with a lower connecting steel plate 21, and the lower end of the ladder section plate 1 is provided with an upper connecting steel plate 15. A viscoelastic layer is provided between the upper connecting steel plate 15 and the lower connecting steel plate 21.

[0039] like Figure 4 As shown, two vertical sliding holes 11 are provided at the lower end of the ladder section plate 1. The two vertical sliding holes 11 are distributed at both ends of the lower end of the ladder section plate 1, and the upper connecting steel plate 15 is located between the two vertical sliding holes 11. An upper sliding seat 111 and a lower sliding seat 112 are slidably inserted in each vertical sliding hole 11. The cross sections of the vertical sliding hole 11, the upper sliding seat 111, and the lower sliding seat 112 are all rectangular. A buffer spring 113 is provided between the upper sliding seat 111 and the lower sliding seat 112. The upper end of the buffer spring 113 is fixed to the lower end surface of the upper sliding seat 111, and the lower end of the buffer spring 113 is fixed to the upper end of the lower sliding seat 112. A roller 114 is rotatably connected to the lower end of the lower sliding seat 112. A pre-positioning support plate 115 is bonded and fixed to the inner wall of the lower end of the vertical sliding hole 11, and the pre-positioning support plate 115 supports the roller 114.

[0040] like Figure 4 , Figure 5 , Figure 6 As shown, two transverse sliding holes 12 are formed inside the stair section plate 1, and the two transverse sliding holes 12 correspond to the two vertical sliding holes 11. One end of the transverse sliding hole 12 is connected to the upper end side wall of the vertical sliding hole 11. An adjustment seat 121 is slidably connected inside the transverse sliding hole 12, and the cross-sections of the transverse sliding hole 12 and the adjustment seat 121 are both rectangular.

[0041] The seismic prefabricated concrete staircase includes a vertical adjustment device 4, which is used to drive the upper sliding seat 111 to rise and fall. The vertical adjustment device 4 includes a scissor jack 41, an adjustment motor 42, and two adjustment arms 43. The lower end of the staircase plate 1 is internally formed with an accommodating cavity 13. The scissor jack 41 and the adjustment motor 42 are both fixed in the accommodating cavity 13, which includes a screw rod 411 and a load-bearing platform 412. The output shaft of the adjustment motor 42 is connected to the screw rod 411, and can drive the screw rod 411 to rotate forward and reverse.

[0042] like Figure 5 , Figure 6 , Figure 7 As shown, there are two adjusting arms 43, which correspond to the upper sliding seats 111 in the two vertical sliding holes 11. The adjusting arm 43 includes an arm body and two forks fixed to the arm body. The arm body is fixed to the load-bearing platform 412. Two through grooves 14 are formed in the step plate 1. The two forks correspond to the two through grooves 14 respectively. The through grooves 14 connect the receiving groove with the vertical sliding hole 11. The arm body is located in the receiving groove. The forks extend into the vertical sliding hole 11 after passing through the through grooves 14, and the forks are attached to the upper end surface of the upper sliding seat 111. The transverse sliding hole 12 is located between the two forks.

[0043] like Figure 5 As shown, four guide posts 6 are also fixed on the accommodating cavity 13. Since there are two adjusting arms 43, there are four forks, and the four forks correspond to four guide posts 6. The forks are provided with guide holes, and the guide posts 6 pass through the guide holes to guide and limit the lifting process of the forks.

[0044] The working principle of the vertical adjustment device 4 is as follows: the adjustment motor 42 drives the screw 411 to rotate, thereby driving the load-bearing platform 412 of the scissor jack 41 to rise and fall, thereby driving the adjustment arm 43 to rise and fall, thereby realizing the function of adjusting the rise and fall of the upper sliding seat 111. At the same time, the adjustment arm 43 separates from the upper sliding seat 111 after rising to a certain distance, thereby realizing the function of separating the vertical adjustment device 4 from the upper sliding seat 111.

[0045] like Figure 5 , Figure 6 , Figure 7As shown, the seismic prefabricated concrete staircase includes a transverse adjustment device 5, which is used to drive the adjustment seat 121 into the vertical sliding hole 11 after the upper sliding seat 111 descends. The transverse adjustment device 5 includes a vertical connecting rod 51, two push rods 52, two push plates 54, and two connecting springs 53. The vertical connecting rod 51 is fixed on the load-bearing platform 412, and the vertical connecting rod 51 is also located in the accommodating cavity 13. The upper end of the push rod 52 is hinged to the vertical connecting rod 51, one end of the buffer spring 113 is fixed to the push rod 52, and the other end is fixed to the push plate 54. The two push plates 54 correspond to the two transverse sliding holes 12 respectively, and the push plates 54 are slidably connected in the transverse sliding holes 12. The inner wall of the transverse sliding hole 12 is formed with a limit groove 122, and the side wall of the push plate 54 is fixed with a limit block 541, which is embedded in the limit groove 122 to prevent the push plate 54 from escaping from the transverse sliding hole 12 and entering the vertical sliding hole 11. The push plate 54 slides in the transverse sliding hole 12 to push the adjustment seat 121 to move.

[0046] Working principle of the lateral adjustment device 5: when the load-bearing platform 412 descends, it drives the vertical connecting rod 51 to descend, the vertical connecting rod 51 drives the push rod 52 to swing, and the push rod 52 drives the connecting spring 53 and the push plate 54 to move, pushing the adjustment seat 121 from the lateral sliding hole 12 to the vertical sliding hole 11.

[0047] The seismic prefabricated concrete staircase includes a controller, a first displacement sensor, a second displacement sensor, and a battery pack 7. The first displacement sensor is installed on the high-end ladder beam 3, and the second displacement sensor is installed on the low-end ladder beam 2. The battery pack 7 and the controller are both located in the accommodating cavity 13. The first displacement sensor, the second displacement sensor, and the regulating motor 42 are all connected to the controller for communication. The battery pack 7 is used to power the regulating motor 42, the controller, the first displacement sensor, and the second displacement sensor.

[0048] The inner wall of the accommodating cavity 13, the inner wall of the horizontal sliding hole 12, and the inner wall of the vertical sliding hole 11 are all fixed steel plates. The staircase plate 1 includes concrete and steel bars, and the fixed steel plates are welded and fixed to the steel bars.

[0049] Working principle: Before an earthquake occurs, the pre-positioning support plate 115 supports the lower sliding seat 112, the upper sliding seat 111, and the buffer spring 113. At this time, the buffer spring 113 is only affected by the gravity of the upper sliding seat 111, and the deformation is small. At this time, the buffer spring 113 is in a standby stage, which is conducive to the long-term storage and standby of the buffer spring 113 and avoids the performance degradation of the buffer spring 113.

[0050] When an earthquake occurs, the vertical adjustment device 4 first causes the upper sliding seat 111 to descend, driving the buffer spring 113, the lower sliding seat 112, and the roller 114 to descend. The roller 114 acts on the pre-positioning support plate 115 and causes it to disengage from the vertical sliding hole 11. The roller 114 contacts the lower connecting steel plate 21, and the buffer spring 113 undergoes a large deformation and is in a compressed state. The lateral adjustment device 5 drives the adjustment seat 121 to slide from the lateral sliding hole 12 to the upper end of the vertical sliding hole 11, and the vertical adjustment device then drives the upper sliding seat 111 to rise and contact the adjustment seat 1 After the lower end of 21 is reached, the vertical adjustment device is separated from the upper sliding seat 111. At this time, the upper end of the adjustment seat 121 abuts against the inner wall of the upper end of the vertical sliding hole 11, and the lower end abuts against the upper end of the upper sliding seat 111. The large elastic force formed by the buffer spring 113 acts on the lower connecting steel plate 21 of the low-end ladder beam 2 through the roller 114 on the lower sliding seat 112. If the stair section plate 1 and the low-end ladder beam 2 have vertical displacement, the buffer spring 113 provides the displacement distance through deformation, thereby reducing the damage of the stair section plate 1 caused by the vertical earthquake, thereby realizing the function of improving the seismic resistance.

Claims

1. A seismic-resistant concrete prefabricated staircase, comprising a staircase plate (1), a low-end staircase beam (2), and a high-end staircase beam (3), characterized in that: The lower end ladder beam (2) is provided with a lower connecting steel plate (21), the lower end of the ladder section plate (1) is provided with an upper connecting steel plate (15), a viscoelastic layer is provided between the upper connecting steel plate (15) and the lower connecting steel plate (21), a vertical sliding hole (11) is provided at the lower end of the ladder section plate (1), an upper sliding seat (111) and a lower sliding seat (112) are inserted into the vertical sliding hole (11), a buffer spring (113) is connected between the upper sliding seat (111) and the lower sliding seat (112), the lower sliding seat (112) is rotatably connected with a roller (114), a pre-positioning support plate (115) is provided at the lower end of the sliding hole, and the pre-positioning support plate (115) is provided at the lower end of the sliding hole. The supporting plate (115) supports the roller (114); a transverse sliding hole (12) is formed inside the lower end of the stair section plate (1); one end of the transverse sliding hole (12) is connected to the upper end side wall of the vertical sliding hole (11); an adjustment seat (121) is slidably connected inside the transverse sliding hole (12); the seismic prefabricated concrete staircase further comprises a vertical adjustment device (4) and a transverse adjustment device (5); the vertical adjustment device (4) is used to drive the upper sliding seat (111) to rise and fall; the transverse adjustment device (5) is used to drive the adjustment seat (121) to enter the vertical sliding hole (11) after the upper sliding seat (111) descends.

2. The seismic-resistant prefabricated concrete staircase according to claim 1, characterized in that: The vertical adjustment device (4) comprises a scissor-type jack (41), an adjustment motor (42), and an adjustment arm (43); the scissor-type jack (41) comprises a screw rod (411) and a load-bearing platform (412); the adjustment motor (42) is used to drive the screw rod (411) to rotate; one end of the adjustment arm (43) is fixed to the load-bearing platform (412), and the other end extends into the vertical sliding hole (11) and presses on the upper end surface of the upper sliding seat (111).

3. The seismic-resistant prefabricated concrete staircase according to claim 2, characterized in that: The lateral adjustment device (5) comprises a vertical connecting rod (51), a push rod (52), a push plate (54), and a connecting spring (53); the vertical connecting rod (51) is fixed on the load-bearing platform (412); the upper end of the push rod (52) is hinged to the vertical connecting rod (51); one end of the connecting spring (53) is fixed to the push rod (52) and the other end is fixed to the push plate (54); the push plate (54) is slidably connected to the lateral sliding hole (12).

4. The seismic-resistant prefabricated concrete staircase according to claim 3, characterized in that: There are two vertical sliding holes (11) distributed at two ends of the lower end of the stair step plate (1), and there are two adjusting arms (43) in the vertical adjusting device (4) corresponding to the upper sliding seats (111) in the two vertical sliding holes (11), respectively.

5. The seismic-resistant prefabricated concrete staircase according to claim 4, characterized in that: The number of the transverse sliding holes (12) and the number of the adjustment seats (121) are both two and correspond to the two vertical sliding holes (11) respectively; the number of the push rods (52), the push plates (54) and the connecting springs (53) in the transverse adjustment device are both two and correspond to the two transverse sliding holes (12) and the two adjustment seats (121) respectively.

6. The seismic-resistant prefabricated concrete staircase according to claim 3, characterized in that: An accommodating cavity (13) is formed inside the lower end of the stair section plate (1), and the scissor jack (41), the regulating motor (42), and the vertical connecting rod (51) are all located in the accommodating cavity (13).

7. The seismic-resistant prefabricated concrete staircase according to claim 6, characterized in that: The inner wall of the accommodating cavity (13), the inner wall of the transverse sliding hole (12), and the inner wall of the vertical sliding hole (11) are all fixed steel plates. The stair section plate (1) includes concrete and steel bars. The fixed steel plates are fixed to the steel bars by welding.

8. The seismic-resistant prefabricated concrete staircase according to claim 1, characterized in that: It also includes a controller, a first displacement sensor, and a second displacement sensor, wherein the first displacement sensor is installed on the high-end ladder beam (3), and the second displacement sensor is installed on the low-end ladder beam (2), and the first displacement sensor, the second displacement sensor, and the regulating motor (42) are all connected to the controller for communication.

9. The seismic-resistant prefabricated concrete staircase according to claim 8, characterized in that: It also includes a battery pack (7), the battery pack (7) being used to supply power to the regulating motor (42), the controller, the first displacement sensor, and the second displacement sensor.

10. The seismic-resistant prefabricated concrete staircase according to claim 1, characterized in that: The pre-positioning support plate (115) is adhesively fixed to the inner wall of the vertical sliding hole (11).

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