A construction device for precast stair on-site installation and method thereof

Abstract

This invention relates to a construction device for on-site installation of prefabricated stairs in the field of building engineering. It includes a scissor lift, with an inclined plate mounted above the scissor lift via an inclined assembly. The inclined assembly controls the degree of inclination of the prefabricated stairs. Two sets of left clamping plates are located on the left side of the inclined plate, and two sets of right clamping plates are located on the right side. Two clamping mechanisms are installed within the inclined plate. When the prefabricated stairs are placed on the inclined plate, the clamping mechanisms drive the left and right clamping plates closer together to clamp the prefabricated stairs. A buffer assembly is located on one side of the left clamping plate. During the inclination of the inclined plate, the buffer assembly reduces the impact load on the left clamping plate from the prefabricated stairs sliding down. This invention solves the problems of high installation cost and difficult installation operation of traditional prefabricated stairs.

Description

Technical Field

[0001] This invention relates to the field of building engineering, specifically to a construction device and method for on-site installation of prefabricated stairs. Background Technology

[0002] Precast stairs are manufactured in a factory and then transported to the construction site for installation. Compared to traditional cast-in-place stairs, they do not require formwork or water curing, solving the problems of cumbersome processes and low construction efficiency associated with cast-in-place stairs, and greatly shortening the construction period. Therefore, they are being adopted by more and more projects. Generally speaking, the existing method for installing precast stairs is hoisting, which involves using a heavy tower crane to lift the precast stairs to the reserved installation position, so that the pre-reserved bolts on the floor slab are inserted into the pre-reserved bolt holes at both ends of the precast stairs. However, when installing precast stairs in some two-story bungalows, the installation cost of using large hoisting equipment is high, and the installation operation is difficult.

[0003] Based on this, the present invention designs a construction device and method for on-site installation of prefabricated stairs to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a construction device and method for on-site installation of prefabricated stairs, in order to solve the problems mentioned in the background art, such as the high cost and difficulty of installation when using large hoisting equipment to install prefabricated stairs in some two-story bungalows.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a construction device for on-site installation of prefabricated stairs, comprising a scissor lift, characterized in that: an inclined plate is provided above the scissor lift via an inclined assembly, the inclined assembly being used to control the degree of inclination of the prefabricated stairs; two sets of left clamping plates are provided on the left side of the inclined plate, and two sets of right clamping plates are provided on the right side of the inclined plate; two sets of clamping mechanisms are provided inside the inclined plate, the clamping mechanisms being able to drive the left clamping plates and the right clamping plates to move closer together and clamp the prefabricated stairs when the prefabricated stairs are placed on the inclined plate; a buffer assembly is provided on one side of the left clamping plate, the buffer assembly being able to reduce the impact load on the left clamping plate when the inclined plate is tilted.

[0006] Preferably, the clamping mechanism includes two telescopic rods that can slide laterally within the inclined plate. The left telescopic rod is rotatably connected to the left clamping plate, and the right telescopic rod is rotatably connected to the right clamping plate. A first rack rod is laterally elastically slidably connected to the telescopic rod. A first spring is provided between the first rack rod and the telescopic rod. A first meshing part is provided on the first rack rod. A pressing component capable of driving the first rack rod to slide laterally is provided on one side of the first rack rod. A second spring is provided between the end of the first rack rod and the interior of the inclined plate. The clamping mechanism also includes a retraction component provided on one side of the right clamping plate, which can drive the right clamping plate to retract as the prefabricated staircase approaches and adheres to the wall.

[0007] Preferably, the pressing assembly includes a second rack rod capable of sliding longitudinally within the inclined plate and a wheel axle formed inside the inclined plate. The second rack rod is provided with a second meshing portion. A pinion and a gear are rotatably connected to the wheel axle. The pinion and the gear are fixedly connected. The pinion can mesh with the second rack portion of the second rack rod, and the gear can mesh with the first rack portion of the first rack rod.

[0008] Preferably, the retraction assembly includes a support frame fixedly connected to the telescopic rod, a stop rod is laterally elastically slidably connected to the support frame, a third spring is provided between the support frame and the stop rod, and an inclined groove is provided on the stop rod. The inclined groove can cooperate with a boss fixedly connected in the right clamping plate during the lateral sliding of the stop rod, thereby driving the right clamping plate to rotate along the axis of the telescopic rod and thus retracting the right clamping plate.

[0009] Preferably, the tilting assembly includes two symmetrically distributed support columns fixedly connected to the scissor lift, the support columns being hinged to the middle of the tilting plate. The tilting assembly also includes a motor mounted on the scissor lift, the output end of the motor being fixedly connected to a screw rod passing through the top of the scissor lift, a stud being threaded onto the screw rod, and a support plate being hinged to the stud. The support plate is capable of sliding at the bottom of the tilting plate.

[0010] Preferably, the buffer assembly includes a slide rod disposed on one side of the left clamping plate and capable of sliding laterally within the inclined plate, a buffer plate fixedly connected to the slide rod, and a fourth spring disposed between the buffer plate and the left clamping plate; the buffer assembly includes a slide plate disposed inside the inclined plate and capable of sliding laterally within the inclined plate, the slide plate being fixedly connected to the support plate, and two baffles fixedly connected to the slide plate capable of sliding laterally within the inclined plate.

[0011] Preferably, both the telescopic rod and the first rack are provided with anti-rotation pins to prevent the telescopic rod and the first rack from rotating when the prefabricated staircase tilts.

[0012] Preferably, the scissor lift is equipped with casters at the bottom.

[0013] Preferably, the present invention provides an installation method for on-site installation of prefabricated stairs, characterized in that:

[0014] Step 1: The worker hoists the prefabricated staircase onto the inclined plate that is in a horizontal position. The bottom of the prefabricated staircase abuts against the second rack and is pressed down. The left clamping plate and the right clamping plate move closer to each other to clamp the prefabricated staircase.

[0015] Step 2: Start the scissor lift and raise the prefabricated staircase to the preset position;

[0016] Step 3: Start the motor, the stud rises, the tilting plate tilts, and the prefabricated staircase placed on the tilting plate tilts accordingly, so that the tilt angle of the prefabricated staircase matches the installation angle.

[0017] Step 4: Move the scissor lift so that the prefabricated staircase is close to and flush against the wall, and align the pre-drilled bolt holes on the prefabricated staircase with the pre-drilled bolts on the ground and intermediate platform; then start the scissor lift to lower the prefabricated staircase to the installation position, completing the installation of the prefabricated staircase between the ground floor and the intermediate platform.

[0018] Step 5: Move the scissor lift to complete the retraction of the device.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention only requires workers to operate a scissor lift to raise and lower the prefabricated stairs, operate a motor to tilt the prefabricated stairs, and then move the scissor lift to complete the installation of the prefabricated stairs. The operation is simple and greatly reduces the installation cost.

[0021] 2. When the prefabricated staircase is placed on the inclined plate, the present invention uses a clamping mechanism to drive the left and right clamping plates to move closer together and clamp the prefabricated staircase. This prevents the prefabricated staircase from swaying relative to the inclined plate during the movement of the scissor lift, and also ensures that the prefabricated staircase does not slip excessively during the tilting of the inclined plate, thus ensuring safety during installation. On the other hand, the clamping mechanism can adapt to prefabricated staircases of different widths, improving the practicality of the device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the installation location of the present invention;

[0024] Figure 2 This is a schematic diagram showing the installation location of the prefabricated staircase according to the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the overall structure of the present invention. Figure 3 ;

[0028] Figure 6 This is a partial cross-sectional view of the present invention. Figure 1 ;

[0029] Figure 7 For the present invention Figure 6 A magnified view of part A and a schematic diagram of the structure after some parts are hidden;

[0030] Figure 8 For the present invention Figure 6 A schematic diagram of the enlarged structure of part B;

[0031] Figure 9 This is a cross-sectional view of a portion of the components of the present invention. Figure 1 ;

[0032] Figure 10 This is a cross-sectional view of a portion of the components of the present invention. Figure 2 ;

[0033] Figure 11 This is a partial cross-sectional view of the present invention. Figure 2 ;

[0034] Figure 12 This is a partial cross-sectional view of the present invention. Figure 3 ;

[0035] Figure 13 This is a diagram illustrating the steps of the method of the present invention.

[0036] The attached diagram lists the components represented by each number as follows: 1-Scissor lift, 2-Wheel, 3-Tilt assembly, 3-1-Support column, 3-2-Staller stud, 3-3-Screw, 3-4-Support plate, 3-5-Motor, 3-6-Tilt plate, 4-Clamping mechanism, 4-1-Telescopic rod, 4-2-First rack, 4-2-1-First meshing part, 4-3-First spring, 4-4-Pressing assembly, 4-4-1-Second rack, 4-4-2-Second meshing part, 4-4-3-Axle, 4-4-4-Pinary gear, 4-4-5-Large gear, 4- 5-Second spring, 4-6-Retraction assembly, 4-6-1-Support frame, 4-6-2-Abutting rod, 4-6-3-Third spring, 4-6-4-Inclined groove, 4-7-Anti-rotation pin, 5-Buffer assembly, 5-1-Slide rod, 5-2-Buffer plate, 5-3-Fourth spring, 5-4-Sliding plate, 5-5-Baffle, 6-Left clamping plate, 7-Right clamping plate, 7-1-Boss, 8-Wall, 9-Intermediate platform, 10-Reserved bolt, 11-Precast staircase, 11-1-Reserved screw hole, 12-Ground, C-Clamping position of left clamping plate, D-Staircase step position. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] See Figure 1 and Figure 2 Workers need to install the prefabricated staircase 11 between the ground 12 and the intermediate platform 9, so that the reserved bolts on the ground and the intermediate platform pass through the reserved screw holes 11-1 on the prefabricated staircase 11. The wall 8 is located on both sides of the intermediate platform 9, and the installation position of the prefabricated staircase 11 should be close to the wall 8.

[0039] Please see Figure 1-13This invention provides a technical solution: a construction device for on-site installation of prefabricated stairs, including a scissor lift 1. An inclined plate 3-6 is mounted above the scissor lift 1 via an inclined assembly 3, which controls the inclination degree of the prefabricated stairs 11. Two sets of left clamping plates 6 are mounted on the left side of the inclined plate 3-6, and two sets of right clamping plates 7 are mounted on the right side of the inclined plate 3-6. Two sets of clamping mechanisms 4 are installed inside the inclined plate 3-6. When the prefabricated stairs 11 are placed on the inclined plate 3-6, the clamping mechanisms 4 can drive the left clamping plates 6 and right clamping plates 7 to move closer together and clamp the prefabricated stairs 11. A buffer assembly 5 is provided on one side of the left clamping plate 6. During the inclination of the inclined plate 3-6, the buffer assembly 5 can reduce the impact load on the left clamping plate 6 caused by the prefabricated stairs 11 sliding down.

[0040] During installation: (e.g.) Figures 1 to 5 (As shown) First, the prefabricated staircase 11 is suspended on the horizontally positioned inclined plate 3-6. The prefabricated staircase 11 is clamped together by the clamping mechanism 4, which drives the left clamping plate 6 and the right clamping plate 7 to move closer together. Then, the scissor lift 1 is driven to lift the prefabricated staircase 11 to the preset position. Subsequently, the tilting component 3 is driven to tilt the inclined plate 3-6, further driving the prefabricated staircase 11 placed on the inclined plate 3-6 to tilt until the tilt angle of the prefabricated staircase 11 matches the installation angle. Then, the scissor lift 1 is moved to bring the prefabricated staircase 11 close to and against the wall (in conjunction with...). Figure 1 and Figure 2 As shown, the prefabricated staircase 11 should be installed flush against the right wall 8. During this process, the clamping mechanism 4 will first abut against the wall 8, causing the right clamping plate 7 to retract without interfering with the prefabricated staircase 11 being flush against the wall 8, and aligning the reserved screw holes 11-1 on the prefabricated staircase 11 with the reserved bolts 10 on the ground 12 and the intermediate platform 9; finally, the scissor lift 1 will be activated to lower the prefabricated staircase 11 to the installation position (in conjunction with...). Figure 2 As shown, the prefabricated staircase 11 is in the installation position, and the installation of the prefabricated staircase 11 between the first floor 12 and the intermediate platform 9 can be completed (the installation of the prefabricated staircase between the intermediate platform 9 and the second floor is similar to the above steps and will not be described in detail).

[0041] This invention only requires workers to hoist the prefabricated staircase 11 onto the inclined plates 3-6. This device can use the self-weight of the prefabricated staircase 11 to complete the clamping action, improving the safety during the installation process. Then, the scissor lift 1 is operated to raise and lower the prefabricated staircase 11, and the inclined component 3 is operated to complete the tilting action of the prefabricated staircase 11. Finally, the installation of the prefabricated staircase 11 can be completed by moving the scissor lift 1. The operation is simple and greatly reduces the installation cost.

[0042] As a further embodiment of the present invention: the clamping mechanism 4 includes two telescopic rods 4-1 that can slide laterally within the inclined plates 3-6. The left telescopic rod 4-1 is movably connected to the left clamping plate 6, and the right telescopic rod 4-1 is movably connected to the right clamping plate 7 (the left clamping plate 6 and the right clamping plate 7 can rotate along the axis of the telescopic rods 4-1 and can slide together with the telescopic rods 4-1); the telescopic rods 4-1 are laterally elastically slidably connected to a first rack rod 4-2, and the first rack rod 4-2 is connected to the telescopic rods 4-1. A first spring 4-3 is provided between 4-1, a first meshing part 4-2-1 is provided on the first rack 4-2, a pressing component 4-4 is provided on one side of the first rack 4-2 that can drive the first rack 4-2 to slide laterally, and a second spring 4-5 is provided between the end of the first rack 4-2 and the interior of the inclined plate; the clamping mechanism 4 also includes a retraction component 4-6 provided on one side of the right clamping plate 7 that can drive the right clamping plate 7 to retract as the prefabricated staircase 11 approaches and presses against the wall.

[0043] In use: Under the drive of external force, the pressing component 4-4 drives the first rack rod 4-2 to slide laterally (at this time, the second spring 4-5 is compressed), which in turn drives the telescopic rod 4-1 to move laterally, thereby driving the left clamping plate 6 and the right clamping plate 7 to move closer to each other and clamp the prefabricated staircase 11 (the first spring 4-3 is in a stretched state, and the amount of stretching is related to the width of the prefabricated staircase). As the prefabricated staircase 11 moves closer to and presses against the wall, the retraction component 4-6 can drive the right clamping plate 7 to retract. After the installation is completed, the second spring 4-5 resets after the pressing component 4-4 is no longer subject to external force, which in turn drives the clamping mechanism 4 to reset.

[0044] When the prefabricated staircase 11 is placed on the inclined plate 3-6, the present invention uses a clamping mechanism 4 to drive the left clamping plate 6 and the right clamping plate 7 to move closer together and clamp the prefabricated staircase 11. This prevents the prefabricated staircase 11 from swaying relative to the inclined plate 3-6 during the movement of the scissor lift 1, and also ensures that the prefabricated staircase 11 does not slip excessively during the tilting of the inclined plate 3-6, thus ensuring safety during installation. On the other hand, the clamping mechanism 4 can adapt to prefabricated staircases 11 of different widths, improving the practicality of the device.

[0045] As a further embodiment of the present invention: the pressing component 4-4 includes a second rack 4-4-1 that can slide longitudinally within the inclined plate 3-6 and a wheel axle 4-4-3 formed inside the inclined plate 3-6. The second rack 4-4-1 is provided with a second meshing portion 4-4-2. A pinion 4-4-4 and a gear 4-4-5 are rotatably connected to the wheel axle 4-4-3. The pinion 4-4-4 and the gear 4-4-5 are fixedly connected. The pinion 4-4-4 can mesh with the second meshing portion 4-4-2 of the second rack 4-4-1, and the gear 4-4-5 can mesh with the first meshing portion 4-2-1 of the first rack 4-2.

[0046] The present invention, by setting the pressing component 4-4, can use the self-weight of the prefabricated staircase 11 to drive the left clamping plate 6 and the right clamping plate 7 to move closer to each other to clamp the prefabricated staircase 11. The structure is simple and the connection is reliable.

[0047] As a further embodiment of the present invention: the retraction assembly 4-6 includes a support frame 4-6-1 fixedly connected to the telescopic rod 4-1, a stop rod 4-6-2 is laterally elastically slidably connected to the support frame 4-6-1, a third spring 4-6-3 is provided between the support frame 4-6-1 and the stop rod 4-6-2, and a groove 4-6-4 is provided on the stop rod 4-6-2. The groove 4-6-4 can cooperate with the boss 7-1 fixedly connected in the right clamping plate 7 during the lateral sliding of the stop rod 4-6-2, thereby driving the right clamping plate 7 to rotate along the axis of the telescopic rod 4-1 and thus removing the right clamping plate 7.

[0048] During the process of moving the scissor lift 1 to bring the prefabricated staircase 11 close to and press it against the wall, the right clamping plate 7 is in a clamping state, which will interfere with the prefabricated staircase 11 pressing against the wall, causing the prefabricated staircase 11 to be unable to reach the installation position. In use: the abutment rod 4-6-2 will first abut against the wall 8. With the cooperation of the inclined groove 4-6-4 and the boss 7-1, the right clamping plate 7 will be driven to rotate along the axis of the telescopic rod 4-1. Since the first spring 4-3 is in a stretched state in the clamping state, when the right clamping plate 7 rotates to no longer clamp the prefabricated staircase 11, the first spring will reset, driving the right clamping plate 7 and the retraction assembly 4-6 to move towards the middle of the inclined plate 3-6, thereby achieving the purpose of not interfering with the prefabricated staircase 11 pressing against the wall.

[0049] As a further embodiment of the present invention: the tilting component 3 includes two symmetrically distributed support columns 3-1 fixedly connected to the scissor lift 1. The support columns 3-1 are hinged to the middle of the tilting plate 3-6. The tilting component 3 also includes a motor 3-5 disposed on the scissor lift 1. The output end of the motor 3-5 passes through the top of the scissor lift 1 and is fixedly connected to a screw 3-3. A stud 3-2 is threadedly connected to the screw 3-3. A support plate 3-4 is hinged to the stud 3-2. The support plate 3-4 can slide at the bottom of the tilting plate 3-6.

[0050] In use: When the tilting plate 3-6 needs to be tilted, start the motor 3-5 to drive the screw 3-3 to rotate. Since the screw 3-3 is threadedly connected to the stud 3-2, the stud 3-2 will rise, which in turn drives the support plate 3-4 to rise. Since the support plate 3-4 is hinged to the stud 3-2 and the support plate 3-4 can slide at the bottom of the tilting plate 3-6, and with the joint action of the support column 3-1, the rise of the support plate 3-4 can tilt the tilting plate 3-6.

[0051] By setting the tilting component 3, the present invention can reliably and stably match the tilt angle of the prefabricated staircase 11 with the installation angle, which facilitates subsequent installation.

[0052] As a further embodiment of the present invention: the buffer assembly 5 includes a slide rod 5-1 disposed on one side of the left clamping plate 6 and capable of sliding laterally within the inclined plate 3-6, a buffer plate 5-2 fixedly connected to the slide rod 5-1, and a fourth spring 5-3 disposed between the buffer plate 5-2 and the left clamping plate 6; the buffer assembly 5 also includes a slide plate 5-4 disposed inside the inclined plate 3-6 and capable of sliding laterally within the inclined plate 3-6, the slide plate 5-4 fixedly connected to the support plate 3-4, and two baffles 5-5 fixedly connected to the slide plate 5-4 capable of sliding laterally within the inclined plate 3-6.

[0053] When the precast staircase 11 is clamped by the left clamping plate 6 and the right clamping plate 7, the subsequent inclined plate 3-6 will tilt. Since it is difficult to ensure a tight fit between the clamping position C of the left clamping plate and a certain step position D of the staircase, the precast staircase 11 will slide a certain distance and then be blocked by the upper part of the left clamping plate. At this time, it will generate a rigid impact on the left clamping plate 6, which can easily lead to damage and scrapping of the left clamping plate 6. In use: when the left clamping plate 6 is in the clamping state, the baffle 5-5 can block the buffer plate 5-2 to prevent the buffer plate 5-2 from rotating. When the inclined plate 3-6 tilts, on the one hand, the precast staircase 11 slides down and impacts the left clamping plate 6, but under the action of the fourth spring 5-3, the left clamping plate 6 can buffer the impact generated by the sliding of the precast staircase 11; on the other hand, as the inclined plate 3-6 tilts, the baffle 5-5 will be displaced, causing the distance between the buffer plate 5-2 and the left clamping plate 6 to gradually decrease, so as to achieve the effect that the displacement of the precast staircase 11 should not be too large.

[0054] By setting up a buffer component 5, the present invention enables the left clamping plate 6 to buffer the impact generated by the sliding of the precast staircase 11 during the tilting process of the inclined plate 3-6, thereby preventing the sliding displacement of the precast staircase 11 from being too large and extending the service life of the left clamping plate 6.

[0055] As a further aspect of the present invention: both the telescopic rod 4-1 and the first rack rod 4-2 are provided with anti-rotation pins 4-7 to prevent the telescopic rod 4-1 and the first rack rod 4-2 from rotating when the prefabricated staircase 11 tilts, thereby improving safety.

[0056] As a further aspect of the present invention: the bottom of the scissor lift 1 is provided with casters 2 to facilitate the movement of the scissor lift.

[0057] As a further aspect of the present invention: the present invention provides an installation method for on-site installation of prefabricated stairs.

[0058] Step 1: The worker hoists the prefabricated staircase 11 onto the inclined plate 3-6 which is in a horizontal position. The bottom of the prefabricated staircase 3-6 abuts against the second rack rod 4-4-1 and is pressed down. The left clamping plate 6 and the right clamping plate 7 move closer to each other to clamp the prefabricated staircase.

[0059] Step 2: Start the scissor lift 1 to lift the prefabricated staircase 11 to the preset position;

[0060] Step 3: Start motor 3-5, stud 3-2 rises, tilt plate 3-6 tilts, and the prefabricated staircase 11 placed on tilt plate 3-6 tilts accordingly, so that the tilt angle of the prefabricated staircase 11 matches the installation angle.

[0061] Step 4: Move the scissor lift 1 so that the prefabricated staircase 11 is close to and flush against the wall 8, and align the pre-drilled bolt holes 11-1 on the prefabricated staircase 11 with the pre-drilled bolts 10 on the ground 12 and the intermediate platform 9; then start the scissor lift 1 to lower the prefabricated staircase 11 to the installation position, completing the installation of the prefabricated staircase 11 between the first floor 12 and the intermediate platform 9 (the installation of the prefabricated staircase between the intermediate platform 9 and the second floor is similar to the previous steps and will not be repeated); Step 5: Move the scissor lift 1 to complete the removal of the device.

Claims

1. A construction device for on-site installation of prefabricated stairs, comprising a scissor lift (1), characterized in that: An inclined plate (3-6) is provided above the scissor lift (1) via an inclined assembly (3). The inclined assembly (3) is used to control the degree of inclination of the prefabricated staircase (11). Two sets of left clamping plates (6) are provided on the left side of the inclined plate (3-6), and two sets of right clamping plates (7) are provided on the right side of the inclined plate (3-6). Two sets of clamping mechanisms (4) are provided inside the inclined plate (3-6). When the prefabricated staircase (11) is placed on the inclined plate (3-6), the clamping mechanisms (4) can drive the left clamping plates (6) and the right clamping plates (7) to move closer to each other and clamp the prefabricated staircase (11). A buffer assembly (5) is provided on one side of the left clamping plate (6). The buffer assembly (5) can reduce the impact load on the left clamping plate (6) when the inclined plate (3-6) slides down during the inclination process. The clamping mechanism (4) includes two telescopic rods (4-1) that can slide laterally within the inclined plate (3-6). The left telescopic rod (4-1) is movably connected to the left clamping plate (6), and the right telescopic rod (4-1) is movably connected to the right clamping plate (7). The telescopic rod (4-1) is laterally elastically slidably connected to a first rack rod (4-2). A first spring (4-3) is provided between the first rack rod (4-2) and the telescopic rod (4-1). A first meshing part (4-2-1) is provided on the first rack rod (4-2). A pressing component (4-4) capable of driving the first rack rod (4-2) to slide laterally is provided on one side of the first rack rod (4-2). A second spring (4-5) is provided between the end of the first rack rod (4-2) and the interior of the inclined plate (3-6). The clamping mechanism (4) also includes a retraction component (4-6) provided on one side of the right clamping plate (7) and capable of driving the right clamping plate (7) to retract as the prefabricated staircase (11) approaches and adheres to the wall. The pressing assembly (4-4) includes a second rack (4-4-1) that can slide longitudinally within the inclined plate (3-6) and a wheel axle (4-4-3) formed inside the inclined plate (3-6). The second rack (4-4-1) is provided with a second meshing portion (4-4-2). A pinion (4-4-4) and a gear (4-4-5) are rotatably connected to the wheel axle (4-4-3). The pinion (4-4-4) and the gear (4-4-5) are fixedly connected. The pinion (4-4-4) can mesh with the second meshing portion (4-4-2) of the second rack (4-4-1), and the gear (4-4-5) can mesh with the first meshing portion (4-2-1) of the first rack (4-2). The retraction assembly (4-6) includes a support frame (4-6-1) fixedly connected to the telescopic rod (4-1). A stop rod (4-6-2) is laterally elastically slidably connected to the support frame (4-6-1). A third spring (4-6-3) is provided between the support frame (4-6-1) and the stop rod (4-6-2). A groove (4-6-4) is provided on the stop rod (4-6-2). The groove (4-6-4) can cooperate with the boss (7-1) fixedly connected in the right clamping plate (7) during the lateral sliding of the stop rod (4-6-2), driving the right clamping plate (7) to rotate along the axis of the telescopic rod (4-1) so as to remove the right clamping plate (7).

2. The construction device for on-site installation of prefabricated stairs according to claim 1, characterized in that: The tilting assembly (3) includes two symmetrically distributed support columns (3-1) fixedly connected to the scissor lift (1). The support columns (3-1) are hinged to the middle of the tilting plate (3-6). The tilting assembly (3) also includes a motor (3-5) mounted on the scissor lift (1). The output end of the motor (3-5) passes through the top of the scissor lift (1) and is fixedly connected to a screw (3-3). A stud (3-2) is threaded onto the screw (3-3). A support plate (3-4) is hinged onto the stud (3-2). The support plate (3-4) can slide at the bottom of the tilting plate (3-6).

3. The construction device for on-site installation of prefabricated stairs according to claim 2, characterized in that: The buffer assembly (5) includes a slide rod (5-1) disposed on one side of the left clamping plate (6) and capable of sliding laterally within the inclined plate (3-6). A buffer plate (5-2) is fixedly connected to the slide rod (5-1). A fourth spring (5-3) is disposed between the buffer plate (5-2) and the left clamping plate (6). The buffer assembly (5) also includes a sliding plate (5-4) disposed inside the inclined plate (3-6) and capable of sliding laterally within the inclined plate (3-6). The sliding plate (5-4) is fixedly connected to the support plate (3-4). Two baffles (5-5) capable of sliding laterally within the inclined plate (3-6) are fixedly connected to the sliding plate (5-4).

4. A construction device for on-site installation of prefabricated stairs according to claim 1, characterized in that: Both the telescopic rod (4-1) and the first rack rod (4-2) are equipped with anti-rotation pins (4-7) to prevent the telescopic rod (4-1) and the first rack rod (4-2) from rotating when the prefabricated staircase (11) is tilted.

5. A construction device for on-site installation of prefabricated stairs according to claim 1, characterized in that: The scissor lift (1) is equipped with casters (2) at the bottom.

6. A method for on-site installation of prefabricated stairs, applicable to the construction device for on-site installation of prefabricated stairs as described in claim 3, characterized in that: Step 1: The worker hoists the precast staircase (11) onto the inclined plate (3-6) which is in a horizontal position. The bottom of the precast staircase (11) abuts against the second rack rod (4-4-1) and is pressed down. The left clamping plate (6) and the right clamping plate (7) move closer to each other to clamp the precast staircase (11). Step 2: Start the scissor lift (1) to lift the prefabricated staircase (11) to the preset position; Step 3: Start the motor (3-5), the stud (3-2) rises, the inclined plate (3-6) tilts, and the prefabricated staircase (11) placed on the inclined plate (3-6) tilts accordingly, so that the tilt angle of the prefabricated staircase (11) matches the installation angle. Step 4: Move the scissor lift (1) so that the prefabricated staircase (11) is close to and flush against the wall, and align the reserved screw holes (11-1) on the prefabricated staircase (11) with the reserved bolts (10) on the ground (12) and the intermediate platform (9); then start the scissor lift (1) to lower the prefabricated staircase (11) to the installation position, and complete the installation of the prefabricated staircase (11) between the ground floor (12) and the intermediate platform (9); Step 5: Move the scissor lift (1) to complete the removal of the device.

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