A precast concrete slab staircase structural performance test device

Abstract

The present invention belongs to the technical field of building prefabricated component testing, and provides a prefabricated concrete slab staircase structure performance testing device, comprising a base, on which two groups of guide frames are fixedly installed, a second support plate is arranged at one end of the base, and a second telescopic member for driving the second support plate to move in a vertical direction is fixedly installed on the base, and a first support plate is slidably installed at one end of the base away from the second support plate, so as to solve the technical problem that the test results in the prior art cannot specifically reflect the changes of the stairs. When in use, the present invention detects the condition of the bottom surface of the stairs through a first pressure sensor and a laser ranging sensor, and then can detect the deflection deformation of the stairs, and the deflection deformation data of the bottom surface of the stairs can be detected through the first pressure sensor and the laser ranging sensor. The present invention can be widely used in the scene of deflection deformation detection.

Description

Technical Field

[0001] The invention belongs to the technical field of building prefabricated component testing, and in particular relates to a prefabricated concrete slab staircase structure performance testing device. Background Art

[0002] After the precast concrete slab staircase is completed, it needs to be tested for structural performance to verify the bearing capacity, deflection and crack resistance of the slab staircase.

[0003] The traditional device for testing plate-type stairs is an integral one and needs to be made according to the style of the stairs. Different styles of stairs require test devices of different sizes, and the test device cannot monitor the bearing capacity and deflection deformation. In response to the above technical problems, the applicant has retrieved some prior arts, such as the Chinese patent with patent announcement number CN212228338U. When in use, the deflection detector emits light from one end of the stairs to detect the deflection deformation of the stairs. When the stairs deflect, the angle of the light emitted by the deflection detector changes. However, since the deflection detector is located at one end of the stairs, although the change in the light angle can detect the deflection change of the stairs, it is difficult to detect the specific deflection changes at each position of the stairs. The test results cannot specifically reflect the changes in the stairs, reducing the effect of the test. Summary of the invention

[0004] The purpose of the present invention is to provide a precast concrete slab staircase structural performance testing device, aiming to solve the technical problem in the prior art that the test results cannot specifically reflect the changes in the stairs.

[0005] The present invention is implemented as follows: a precast concrete slab staircase structure performance test device comprises a base, two sets of guide frames are fixedly mounted on the base, a second support plate is arranged at one end of the base and a second telescopic member for driving the second support plate to move in a vertical direction is fixedly mounted on the base, a first support plate is slidably mounted at one end of the base away from the second support plate, and a first telescopic member for driving the first support plate to move in a horizontal direction is fixedly mounted on the base;

[0006] The first support plate and the second support plate are both provided with two groups of parallel vertical sections, and the two groups of vertical sections are connected by a horizontal section. A movable plate is provided on the base, and the first support plate and the second support plate are jointly provided with an adjustment component for adjusting the position and angle of the movable plate. A plurality of groups of laser ranging sensors distributed at intervals are fixedly installed on the middle of the surface of the movable plate away from the base. A plurality of top plates located on both sides of the laser ranging sensors are provided on the movable plate, and rollers are rotatably installed on the top plates. A first pressure sensor located in the projection area of ​​the top plates onto the movable plates is fixedly installed on the movable plate, and pressure is generated on the first pressure sensor after the roller contacts the bottom surface of the stairs. A load component for applying pressure to the stairs is provided on the base.

[0007] Further technical solution: A telescopic rod is fixedly installed on the top plate, the telescopic rod is fixedly connected to the movable plate, a first elastic member is fixedly installed on the surface of the top plate close to the movable plate, and one end of the first elastic member away from the top plate is fixedly connected to the first pressure sensor.

[0008] Further technical solution: A groove is provided on the vertical section where the first support plate contacts the base, a rotating plate is rotatably installed in the groove, two groups of parallel and spaced support rods are fixedly installed on the rotating plate, one end of the support rod away from the first support plate is connected to the second support plate, and the movable plate is slidably installed on the support rod.

[0009] Further technical solution: The adjustment component includes three groups of slide grooves, which are opened in parallel on the vertical section of the second support plate close to the base. The slide grooves are distributed along the vertical direction and two groups of support rods pass through the slide grooves on both sides. The ends of the two groups of support rods away from the rotating plate are jointly fixed with a connecting plate.

[0010] Further technical solution: a lifting frame is slidably installed in the two groups of sliding grooves on both sides, a connecting sleeve is rotatably installed on the lifting frame, the support rod passes through the connecting sleeve and is slidably connected with the connecting sleeve, and a third telescopic part is provided on the second support plate to drive the two groups of lifting frames to move synchronously.

[0011] Further technical solution: A connecting groove connecting two adjacent groups of slide grooves is provided on the second support plate, a lifting plate is slidably installed in the connecting groove, both ends of the lifting plate are fixedly connected to the lifting frames on both sides, and the lifting plate is fixedly connected to the output end of the third telescopic member.

[0012] Further technical solution: The adjustment assembly also includes a screw rod, which is rotatably installed on the rotating plate and parallel to the support rod. The screw rod is rotatably connected to the movable plate and passes through the middle slide groove. The end of the screw rod away from the rotating plate is rotatably connected to the connecting plate, and a rotating power part that drives the screw rod to rotate is fixedly installed on the rotating plate.

[0013] Further technical solution: The load assembly includes a mounting frame, which is provided with multiple groups and is slidably installed on the base, the mounting frame is slidably connected to the guide frame, the horizontal section of the mounting frame is fixedly installed with a fourth telescopic member, the output end of the fourth telescopic member is fixedly installed with a pressure plate, and the pressure plate is provided with a second pressure sensor for detecting load pressure.

[0014] Further technical solution: scrapers are fixedly installed on the sides of the top plate that are away from each other, and slide rods are slidably installed on the sides of the scrapers. The slide rods move in a direction perpendicular to the movable plate. A crushing plate is fixedly installed on the end of the slide rod away from the movable plate. Multiple groups of spaced crushing cones are fixedly installed on the surface of the crushing plate away from the slide rod. When the roller rotates, the slide rod is driven to move back and forth.

[0015] Further technical solution: a U-shaped lower pressure frame is fixedly installed on one end of the sliding rod close to the movable plate, the lower pressure frame penetrates the scraper and is in sliding contact with the scraper, a second elastic member is fixedly installed on the lower pressure frame, and the end of the second elastic member away from the lower pressure frame is fixedly connected to the mounting portion of the sliding rod, and multiple groups of lower pressure plates are fixedly installed on the rotating shaft of the roller, and when the lower pressure plate rotates, it contacts the lower pressure frame and pushes the lower pressure frame to move downward.

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

[0017] 1. After the stairs are placed, a downward pressure is applied to the stairs from the top through the load assembly. After adjusting the moving trajectory of the movable plate, the movable plate is moved from one end of the stairs to the other end. During this process, the condition of the bottom surface of the stairs is detected by the first pressure sensor and the laser ranging sensor, and the deflection deformation of the stairs can be detected. The deflection deformation data of the bottom surface of the stairs can be detected by the first pressure sensor and the laser ranging sensor. The two sets of data can be compared and judged to improve the accuracy of stair deflection detection. At the same time, the detection data of the first pressure sensor and the laser ranging sensor can fully record and reflect the deflection deformation of the entire bottom surface of the stairs, so that the position and degree of the stair deflection deformation can be understood in detail by the staff, thereby improving the practicality of stair deflection deformation detection.

[0018] 2. When adjusting the moving trajectory of the moving plate, if the readings of the first pressure sensors on the upper and lower sides change, and the laser ranging sensor detects that the distance to the stair ground changes, and both change and then return to the initial values, it means that there is a problem with the flatness of the bottom surface of the stairs. At this time, the data of the bottom surface of the stairs can be recorded through the changes in the readings of the first pressure sensor and the laser ranging sensor, which is convenient for comparing the state of the stairs with the initial data after increasing the load pressure, thereby improving the accuracy of stair deflection detection.

[0019] 3. When the roller rotates, the crushing plate approaches the bottom of the stairs so that the crushing cone can impact and crush the impurities such as concrete remaining on the bottom of the stairs. Under the action of vibration, the connection strength between the impurities and the bottom of the stairs is reduced. After that, the scraper passes through this area to scrape the impurities off the bottom of the stairs, thereby ensuring that the area where the roller moves and the area detected by the laser ranging sensor remain flat, avoiding the change in the first pressure sensor reading and the reduction in the detection reading of the laser ranging sensor due to the bumping of the roller caused by the protrusion of impurities, thereby further improving the accuracy of stair performance detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the base in the present invention.

[0022] Figure 3 It is a schematic structural diagram of the first supporting plate in the present invention.

[0023] Figure 4 It is a schematic structural diagram of the second supporting plate in the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the movable plate in the present invention.

[0025] Figure 6 It is a structural schematic diagram of the top plate in the present invention.

[0026] In the accompanying drawings: 1. base; 2. guide frame; 3. first support plate; 4. first telescopic member; 5. second telescopic member; 6. second support plate; 7. groove; 8. rotating plate; 9. support rod; 10. rotating power member; 11. screw rod; 12. moving plate; 13. laser ranging sensor; 14. telescopic rod; 15. top plate; 16. first elastic member; 17. first pressure sensor; 18. roller; 19. slide bar; 20. second elastic member; 21. crushing plate; 22. scraper; 23. lower pressure frame; 24. lower pressure plate; 25. slide groove; 26. connecting groove; 27. third telescopic member; 28. lifting plate; 29. ​​connecting plate; 30. lifting frame; 31. connecting sleeve; 32. mounting frame; 33. fourth telescopic member; 34. second pressure sensor; 35. pressure plate; 36. adjustment component; 37. load component. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0029] like Figure 1-Figure 5 As shown, a precast concrete slab staircase structure performance test device provided by the present invention comprises a base 1, two sets of guide frames 2 are fixedly installed on the base 1, a second support plate 6 is arranged at one end of the base 1, and a second telescopic member 5 for driving the second support plate 6 to move in a vertical direction is fixedly installed on the base 1, a first support plate 3 is slidably installed at one end of the base 1 away from the second support plate 6, and a first telescopic member 4 for driving the first support plate 3 to move in a horizontal direction is fixedly installed on the base 1;

[0030] The first support plate 3 and the second support plate 6 are both provided with two sets of parallel vertical sections, and the two sets of vertical sections are connected by a horizontal section. A movable plate 12 is provided on the base 1, and an adjustment component 36 for adjusting the position and angle of the movable plate 12 is provided on the first support plate 3 and the second support plate 6. A plurality of sets of laser distance measuring sensors 13 distributed at intervals are fixedly installed on the middle of the surface of the movable plate 12 away from the base 1. A plurality of top plates 15 located on both sides of the laser distance measuring sensors 13 are provided on the movable plate 12, and rollers 18 are rotatably installed on the top plates 15. The movable plate A first pressure sensor 17 located in the projection area of ​​the top plate 15 onto the moving plate 12 is fixedly installed on 12, and the roller 18 generates pressure on the first pressure sensor 17 after contacting the bottom surface of the stairs. A telescopic rod 14 is fixedly installed on the top plate 15, and the telescopic rod 14 is fixedly connected to the moving plate 12. A first elastic member 16 is fixedly installed on the surface of the top plate 15 close to the moving plate 12, and one end of the first elastic member 16 away from the top plate 15 is fixedly connected to the first pressure sensor 17. A load component 37 for applying pressure to the stairs is provided on the base 1.

[0031] In actual application of this embodiment, the position of the first support plate 3 is adjusted by the first telescopic member 4 according to the length of the stairs, the height of the second support plate 6 is adjusted by the second telescopic member 5, and the stairs are placed on the first support plate 3 and the second support plate 6 by external lifting equipment. The first support plate 3 and the second support plate 6 support the stairs through the horizontal section, and the vertical sections of the first support plate 3 and the second support plate 6 are in contact with the end surface of the stairs, so as to achieve stable placement of the stairs;

[0032] The movable plate 12 is moved to one end of the stairs by the adjusting component 36, and then the inclination angle of the movable plate 12 is adjusted by the adjusting component 36. During the process of changing the angle of the movable plate 12, the roller 18 on the lower side will first contact with the lower surface of the stairs and generate pressure on the corresponding first pressure sensor 17 through the first elastic member 16. At this time, the movable plate 12 continues to rotate until the roller 18 on the upper side contacts with the bottom surface of the stairs and generates pressure on the corresponding first pressure sensor 17 through the first elastic member 16. When the readings detected by the first pressure sensors 17 on the upper and lower sides are the same, the movable plate 12 is parallel to the bottom surface of the stairs. At this time, the laser ranging sensor 13 is turned on to move the movable plate 12 along the bottom surface of the stairs, and the roller 18 will move along the bottom surface of the stairs. If the readings of the first pressure sensors 17 on the upper and lower sides remain unchanged and the distance to the bottom surface of the stairs detected by the laser ranging sensor 13 remains unchanged, it means that the movable plate 12 is parallel to the bottom surface of the stairs, and the data of the bottom surface of the stairs can be recorded by the first pressure sensor 17 and the laser ranging sensor 13.

[0033] Afterwards, downward pressure is applied to the stairs from above through the load component 37, so that the movable plate 12 moves from one end of the stairs to the other end again. In this process, by continuing to detect the condition of the bottom surface of the stairs through the first pressure sensor 17 and the laser ranging sensor 13, the deflection deformation of the stairs can be detected, and the deflection deformation data of the bottom surface of the stairs can be detected by the first pressure sensor 17 and the laser ranging sensor 13. The two sets of data can be compared and judged to improve the accuracy of the stair deflection detection. At the same time, the detection data of the first pressure sensor 17 and the laser ranging sensor 13 can fully record and reflect the deflection deformation of the entire bottom surface of the stairs, so that the position and degree of the stair deflection deformation can be understood in detail by the staff, thereby improving the practicability of the stair deflection deformation detection.

[0034] In an example of the present embodiment, the first telescopic member 4 and the second telescopic member 5 are respectively the first electric telescopic rod and the second electric telescopic rod, and of course they can also be other components that can actively change the length, such as a hydraulic cylinder. The first electric telescopic rod and the second electric telescopic rod respectively drive the first support plate 3 and the second support plate 6 to move. The first elastic member 16 is a first spring, and of course it can also be other elastic components such as an elastic ball. The first spring applies a thrust to the top plate 15 so that the roller 18 contacts the bottom surface of the stairs.

[0035] like Figure 1-Figure 4 As shown, a precast concrete slab staircase structure performance test device provided by the present invention is provided, a groove 7 is provided on the vertical section where the first support plate 3 contacts the base 1, a rotating plate 8 is rotatably installed in the groove 7, two groups of parallel and spaced support rods 9 are fixedly installed on the rotating plate 8, one end of the support rod 9 away from the first support plate 3 is connected to the second support plate 6, and a movable plate 12 is slidably installed on the support rod 9.

[0036] Specifically, the adjustment component 36 includes a slide groove 25, which is provided with three groups and is opened in parallel on the vertical section of the second support plate 6 close to the base 1. The slide grooves 25 are distributed along the vertical direction and two groups of support rods 9 pass through the slide grooves 25 on both sides. The ends of the two groups of support rods 9 away from the rotating plate 8 are jointly fixed with a connecting plate 29.

[0037] Specifically, a lifting frame 30 is slidably installed in the two groups of slide grooves 25 on both sides, a connecting sleeve 31 is rotatably installed on the lifting frame 30, the support rod 9 passes through the connecting sleeve 31 and is slidably connected to the connecting sleeve 31, and a third telescopic member 27 is provided on the second support plate 6 to drive the two groups of lifting frames 30 to move synchronously.

[0038] Specifically, a connecting groove 26 connecting two adjacent groups of slide grooves 25 is formed on the second support plate 6, and a lifting plate 28 is slidably installed in the connecting groove 26. Both ends of the lifting plate 28 are fixedly connected to the lifting frames 30 on both sides, and the lifting plate 28 is fixedly connected to the output end of the third telescopic member 27.

[0039] Specifically, the adjustment assembly 36 also includes a screw rod 11, which is rotatably installed on the rotating plate 8 and parallel to the support rod 9. The screw rod 11 is rotatably connected to the movable plate 12 and the screw rod 11 passes through the middle slide groove 25. The end of the screw rod 11 away from the rotating plate 8 is rotatably connected to the connecting plate 29. A rotating power part 10 is fixedly installed on the rotating plate 8 to drive the screw rod 11 to rotate.

[0040] In actual application of this embodiment, after the stairs are placed on the first support plate 3 and the second support plate 6, the third telescopic member 27 drives the two sets of lifting frames 30 to move upward through the lifting plate 28, and the lifting frame 30 drives the support rod 9 to move upward through the connecting sleeve 31, so that the rotating plate 8 will rotate to change the inclination angle of the support rod 9, and at this time the inclination angle of the moving plate 12 will change accordingly. During the change of the angle of the support rod 9, the lower roller 18 will first contact the lower surface of the stairs and compress the corresponding first elastic member 16. At this time, the support rod 9 continues to rotate until the upper roller 18 contacts the bottom surface of the stairs and compresses the corresponding first elastic member 16. At this time, the first pressure sensor 17 will detect a reading. When the readings detected by the first pressure sensors 17 on the upper and lower sides are the same, the moving plate 12 is parallel to the bottom surface of the stairs.

[0041] At this time, the rotating power part 10 drives the screw rod 11 to rotate, and at the same time turns on the laser ranging sensor 13, so that the movable plate 12 moves along the support rod 9, and the roller 18 moves along the bottom surface of the stairs. If the readings of the first pressure sensors 17 on the upper and lower sides remain unchanged and the laser ranging sensor 13 detects that the distance to the bottom surface of the stairs remains unchanged, it means that the support rod 9 is parallel to the bottom surface of the stairs. If the readings of the first pressure sensors 17 on the upper and lower sides change, and the laser ranging sensor 13 detects that the distance to the ground of the stairs changes, and the two return to the initial values ​​after the changes, it means that there is a problem with the flatness of the bottom surface of the stairs. At this time, the data of the bottom surface of the stairs can be recorded through the changes in the readings of the first pressure sensor 17 and the laser ranging sensor 13, which is convenient for comparing the state of the stairs with the initial data after the load pressure is increased, thereby improving the accuracy of the stair deflection detection.

[0042] After applying pressure to the stairs, the movable plate 12 is moved along the bottom surface of the stairs again, and the data of the bottom surface of the stairs are recorded by the first pressure sensor 17 and the laser ranging sensor 13. By comparing with the initial data, detailed and accurate stair deflection deformation data can be obtained.

[0043] In one embodiment of the present invention, the rotating power part 10 is a motor, and of course it can also be other parts that can output rotational power, such as a hydraulic motor. The motor drives the screw rod 11 to rotate, thereby moving the movable plate 12. The third telescopic part 27 is a third electric telescopic rod, and of course it can also be other parts that can actively change the length, such as a hydraulic cylinder. The third electric telescopic rod drives the support rod 9 to rotate, thereby adjusting the angle of the movable plate 12.

[0044] like Figure 1 , Figure 2 As shown, a precast concrete slab staircase structure performance test device provided by the present invention, the load assembly 37 includes a mounting frame 32, the mounting frame 32 is provided with multiple groups and is slidably installed on the base 1, the mounting frame 32 is slidably connected to the guide frame 2, the horizontal section of the mounting frame 32 is fixedly installed with a fourth telescopic member 33, the output end of the fourth telescopic member 33 is fixedly installed with a pressure plate 35, and the pressure plate 35 is provided with a second pressure sensor 34 for detecting load pressure.

[0045] In actual application of this embodiment, the position of the mounting frame 32 is adjusted according to the need to apply pressure to the stairs, and then the fourth telescopic member 33 drives the pressure plate 35 to move downward to contact the stairs and apply pressure to the stairs, and the second pressure sensor 34 detects the magnitude of the pressure applied to the stairs.

[0046] In an example of the present invention, the fourth telescopic member 33 is a fourth electric telescopic rod, and of course, it can also be other components that can actively change the length, such as a hydraulic cylinder, and the pressure plate 35 is driven to move by the fourth electric telescopic rod.

[0047] like Figure 1-Figure 6 As shown, a precast concrete slab staircase structure performance test device provided by the present invention is provided, wherein a scraper 22 is fixedly installed on the side of the top plate 15 away from each other, a slide bar 19 is slidably installed on the side of the scraper 22, the slide bar 19 moves in a direction perpendicular to the movable plate 12, a crushing plate 21 is fixedly installed on the end of the slide bar 19 away from the movable plate 12, a plurality of groups of spaced-apart crushing cones are fixedly installed on the surface of the crushing plate 21 away from the slide bar 19, and the roller 18 drives the slide bar 19 to move back and forth when it rotates.

[0048] Specifically, a U-shaped lower pressure frame 23 is fixedly installed on one end of the slide bar 19 close to the movable plate 12. The lower pressure frame 23 penetrates the scraper 22 and is in sliding contact with the scraper 22. A second elastic member 20 is fixedly installed on the lower pressure frame 23. The end of the second elastic member 20 away from the lower pressure frame 23 is fixedly connected to the mounting portion of the slide bar 19. A plurality of lower pressure plates 24 are fixedly installed on the rotating shaft of the roller 18. When the lower pressure plate 24 rotates, it contacts the lower pressure frame 23 and pushes the lower pressure frame 23 to move downward.

[0049] When the present embodiment is actually used, when the movable plate 12 is parallel to the bottom surface of the stairs, the roller 18 contacts the bottom surface of the stairs with pressure, and the scraper 22 contacts the bottom surface of the stairs without pressure. When the movable plate 12 moves along the support rod 9, the roller 18 rotates under the action of friction, and the lower pressing plate 24 is driven to rotate when the roller 18 rotates. After the lower pressing plate 24 contacts the lower pressing frame 23, it pushes the lower pressing frame 23 to move downward and stretches the second elastic member 20. As the lower pressing plate 24 rotates, it will separate from the lower pressing frame 23. At this time, under the action of the second elastic member 20, the lower pressing frame 23 moves upward, thereby breaking the lower pressing frame 23. The crushing plate 21 approaches the bottom surface of the stairs so that the crushing cone can impact and crush impurities such as concrete remaining on the bottom surface of the stairs, and reduce the connection strength between the impurities and the bottom surface of the stairs under the action of vibration. Then the scraper 22 passes through this area to scrape the impurities off the bottom surface of the stairs, thereby ensuring that the area where the roller 18 moves and the area detected by the laser ranging sensor 13 remain flat, avoiding the change in the reading of the first pressure sensor 17 and the reduction in the detection reading of the laser ranging sensor 13 caused by the jumping of the roller 18 due to the protrusion of impurities, thereby further improving the accuracy of the stair performance detection.

[0050] In an example of the present invention, the second elastic member 20 is a second spring, and of course, it can also be other elastic members such as an elastic ball, and the second spring applies a resetting thrust to the crushing plate 21 .

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A precast concrete slab staircase structural performance test device, comprising a base (1), on which two sets of guide frames (2) are fixedly mounted, characterized in that: A second support plate (6) is provided at one end of the base (1), and a second telescopic member (5) is fixedly mounted on the base (1) for driving the second support plate (6) to move in a vertical direction; a first support plate (3) is slidably mounted on one end of the base (1) away from the second support plate (6), and a first telescopic member (4) is fixedly mounted on the base (1) for driving the first support plate (3) to move in a horizontal direction; The first support plate (3) and the second support plate (6) are each provided with two groups of parallel vertical sections, and the two groups of vertical sections are connected by a horizontal section. A movable plate (12) is provided on the base (1), and an adjustment component (36) for adjusting the position and angle of the movable plate (12) is provided on the first support plate (3) and the second support plate (6). A plurality of groups of laser distance measuring sensors (13) are fixedly installed at a middle portion of a surface of the movable plate (12) away from the base (1). A plurality of top plates (15) are provided on the movable plate (12) and are located on both sides of the laser distance measuring sensors (13). A roller (18) is rotatably installed on the top plate (15). A first pressure sensor (17) is fixedly installed on the movable plate (12) and is located in a projection area of ​​the top plate (15) onto the movable plate (12). When the roller (18) contacts the bottom surface of the stairs, it generates pressure on the first pressure sensor (17). A load component (37) for applying pressure to the stairs is provided on the base (1); A scraper (22) is fixedly mounted on the side of the top plate (15) away from each other, a slide bar (19) is slidably mounted on the side of the scraper (22), the slide bar (19) moves in a direction perpendicular to the movable plate (12), a crushing plate (21) is fixedly mounted on one end of the slide bar (19) away from the movable plate (12), a plurality of groups of crushing cones distributed at intervals are fixedly mounted on the surface of the crushing plate (21) away from the slide bar (19), and the roller (18) drives the slide bar (19) to reciprocate when it rotates; A U-shaped lower pressure frame (23) is fixedly mounted on one end of the slide bar (19) close to the movable plate (12); the lower pressure frame (23) penetrates the scraper plate (22) and is in sliding contact with the scraper plate (22); a second elastic member (20) is fixedly mounted on the lower pressure frame (23); an end of the second elastic member (20) away from the lower pressure frame (23) is fixedly connected to the mounting portion of the slide bar (19); a plurality of lower pressure plates (24) are fixedly mounted on the rotating shaft of the roller (18); when the lower pressure plates (24) rotate, they contact the lower pressure frame (23) and push the lower pressure frame (23) to move downward.

2. A precast concrete slab staircase structural performance testing device according to claim 1, characterized in that: A telescopic rod (14) is fixedly mounted on the top plate (15), the telescopic rod (14) is fixedly connected to the movable plate (12), a first elastic member (16) is fixedly mounted on a surface of the top plate (15) close to the movable plate (12), and an end of the first elastic member (16) away from the top plate (15) is fixedly connected to a first pressure sensor (17).

3. A precast concrete slab staircase structural performance testing device according to claim 1, characterized in that: A groove (7) is provided on the vertical section where the first support plate (3) contacts the base (1), a rotating plate (8) is rotatably mounted in the groove (7), two groups of parallel and spaced support rods (9) are fixedly mounted on the rotating plate (8), one end of the support rod (9) away from the first support plate (3) is connected to the second support plate (6), and the movable plate (12) is slidably mounted on the support rod (9).

4. A precast concrete slab staircase structural performance testing device according to claim 3, characterized in that: The adjustment assembly (36) comprises a slide groove (25), wherein three groups of the slide grooves (25) are provided and are opened in parallel on a vertical section of the second support plate (6) close to the base (1), the slide grooves (25) are distributed along the vertical direction and two groups of support rods (9) pass through the slide grooves (25) on both sides, and the ends of the two groups of support rods (9) away from the rotating plate (8) are fixedly mounted with a connecting plate (29).

5. A precast concrete slab staircase structural performance testing device according to claim 4, characterized in that: A lifting frame (30) is slidably mounted in the two groups of sliding grooves (25) on both sides, a connecting sleeve (31) is rotatably mounted on the lifting frame (30), the support rod (9) passes through the connecting sleeve (31) and is slidably connected to the connecting sleeve (31), and a third telescopic member (27) is provided on the second support plate (6) for driving the two groups of lifting frames (30) to move synchronously.

6. A precast concrete slab staircase structural performance testing device according to claim 5, characterized in that: The second support plate (6) is provided with a connecting groove (26) connecting two adjacent groups of slide grooves (25), a lifting plate (28) is slidably mounted in the connecting groove (26), two ends of the lifting plate (28) are fixedly connected to lifting frames (30) on both sides, and the lifting plate (28) is fixedly connected to the output end of the third telescopic member (27).

7. A precast concrete slab staircase structural performance testing device according to claim 6, characterized in that: The adjustment assembly (36) further comprises a screw rod (11), the screw rod (11) being rotatably mounted on the rotating plate (8) and being parallel to the support rod (9), the screw rod (11) being rotatably connected to the movable plate (12) and the screw rod (11) passing through the middle slide groove (25), one end of the screw rod (11) away from the rotating plate (8) being rotatably connected to the connecting plate (29), and a rotating power member (10) for driving the screw rod (11) to rotate is fixedly mounted on the rotating plate (8).

8. The precast concrete slab staircase structural performance testing device according to claim 1 is characterized in that: The load assembly (37) comprises a mounting frame (32), the mounting frame (32) being provided with a plurality of groups and being slidably mounted on the base (1), the mounting frame (32) being slidably connected to the guide frame (2), a fourth telescopic member (33) being fixedly mounted on a horizontal section of the mounting frame (32), a pressure plate (35) being fixedly mounted on an output end of the fourth telescopic member (33), and a second pressure sensor (34) for detecting load pressure being provided on the pressure plate (35).

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