Precise positioning device for embedded bolts of assembly type prefabricated staircase

Abstract

The invention relates to the technical field of building construction, and discloses an assembly type prefabricated stair embedded bolt accurate positioning device which comprises a positioner and a positioning bolt, the positioner is installed on the lower surface of a prefabricated stair plate in an embedded mode, the positioning bolt is embedded in the upper surface of a stair beam, and the positioner comprises an installation shell. Two positioning blocks are slidably mounted in the mounting shell, a transmission assembly is arranged between the two positioning blocks, and the transmission assembly drives the positioning blocks to extend out of the mounting shell. According to the positioning device, in the hoisting installation process of the prefabricated stair board, the positioning block in the positioner automatically stretches out and abuts against the positioning bolt, accurate positioning is achieved through the positioner and the positioning bolt, the position of the positioning block in the positioner can be adjusted, the angle and the position of the prefabricated stair board can be adjusted, and therefore accurate positioning is achieved; and the angle and position of the prefabricated stair plate can be corrected and finely adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a precise positioning device for embedded bolts of assembled prefabricated stairs. Background Art

[0002] The design of the assembled prefabricated staircase has the advantages of easy manufacturing and quick installation, which greatly improves the construction progress. During the assembly process, the prefabricated staircase needs to be accurately positioned. In the prior art, the patent document with the announcement number CN114439114A discloses a pre-embedded latch device for assembled staircases and a construction method thereof. The device includes a pre-embedded nut, a latch and a blocking nut. The pre-embedded nut is pre-fixed on the lower surface of the surface layer template for casting the staircase beam, and then after casting the staircase beam and hoisting the prefabricated staircase onto the staircase beam, the latch is passed through the plug-in cavity at the end of the prefabricated staircase and screwed with the pre-embedded nut. Finally, the blocking nut is screwed with the end of the latch to block the plug-in cavity opening of the prefabricated staircase. This invention uses the aforementioned technical solution to achieve connection between the prefabricated stairs and the stair beams with a two-stage embedded pin device, so as to ensure accurate positioning of the prefabricated stairs and the stair beams while also ensuring sufficient anchoring capacity between the two, thereby overcoming the current problem of difficulty in aligning and positioning the bulky end cavity of the prefabricated stairs with the embedded pins in a narrow lifting space.

[0003] In the actual assembly process, the assembly position often does not meet the requirements. Usually, the prefabricated stairs are manually pushed to the exact position when they are suspended. For example, due to unstable force applied and obstruction of positioning bolts, the prefabricated stairs will still deviate after landing. It is difficult to correct them manually, which affects the efficiency of installation. Based on this, the assembly positioning of existing prefabricated stairs has the defect of being inconvenient to correct and fine-tune, which needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to solve the defect in the prior art that the assembly positioning of the stairs is inconvenient to correct and fine-tune, and to propose a precise positioning device for embedded bolts of assembled prefabricated stairs.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a precise positioning device for embedded bolts of assembled prefabricated stairs, comprising a positioner and a positioning bolt, wherein the positioner is embedded and installed on the lower surface of the prefabricated stair slab, and the positioning bolt is embedded in the upper surface of the stair beam.

[0006] Specifically, the positioner includes a mounting shell, two positioning blocks are slidably mounted inside the mounting shell, a transmission assembly is arranged between the two positioning blocks, and the positioning blocks are driven by the transmission assembly to extend outward from the mounting shell.

[0007] An installation cavity is reserved on the lower surface of the prefabricated stair slab, and an installation shell is fixedly installed in the installation cavity. The end faces of the installation shell and the inner wall of the installation cavity form two positioning cavities. After the prefabricated stair slab is hoisted and placed on the ladder beam, the positioning bolts are inserted into the positioning cavities, and the positioning blocks are pressed against the positioning bolts. The adjustable position function of the positioning block in the positioner is utilized to achieve the effect of adjustable angle and position of the prefabricated stair slab.

[0008] Preferably, the transmission assembly includes a center block and a connecting rod, two connecting rods are rotatably installed on both sides of the center block, the ends of the connecting rods away from the center block are rotatably connected to the positioning block, a vertical adjusting screw is installed on the inner thread of the center block, a pad is rotatably installed on the bottom end of the adjusting screw, and the rotating adjusting screw can drive the prefabricated stair slab to move in the longitudinal direction to achieve fine-tuning positioning.

[0009] Preferably, the surface of the prefabricated stair slab is provided with a reserved opening which passes downward through the installation shell, and the upper surfaces of the two positioning blocks are provided with extension parts, which extend into the reserved opening, and the surfaces of the extension parts are provided with open grooves, wherein the first wedge plate and the second wedge plate are inserted into the open grooves on the extension parts, and by pressing down the first wedge plate, the prefabricated stair slab can be driven to move in the lateral direction to achieve fine-tuning of the positioning.

[0010] Preferably, the end faces of the two positioning blocks that are away from each other are arc-shaped faces, and the arc-shaped face contours of the two positioning blocks are on the same circular contour line. Two positioning bolts are installed on the upper surface of the ladder beam, and the spacing between the two positioning bolts is smaller than the diameter of the same circular contour line. When the positioning blocks at four places are pressed against the end caps, the angle deviation of the prefabricated stair slab can be adjusted to prevent the prefabricated stair slab from shaking.

[0011] Preferably, the upper edges of the arc-shaped surfaces of the two positioning blocks are both provided with chamfered surfaces, wherein an end cap is fixedly installed on the top end of the positioning bolt, and a conical surface is provided on the lower side of the end cap. When the positioning block extends outward from the mounting shell, the chamfered surface contacts the conical surface, and a gap is left between the positioning block and the positioning bolt. The adjusting connecting rod is tightened, and the chamfered surface provides a downward pressure force for the positioning block to prevent the prefabricated stair slab from tilting and shaking.

[0012] Preferably, the locators are installed on the lower surfaces of both ends of the prefabricated stair treads, and the upper end of the prefabricated stair treads is assembled with two positioning bolts on the upper stair beam through the locators, and the lower end of the prefabricated stair treads is assembled with two positioning bolts on the lower stair beam through the locators, so as to realize the positioning and fixation of both ends of the prefabricated stair treads.

[0013] The present invention has the following beneficial effects:

[0014] 1. The positioning device proposed in the present invention has a positioning block in the positioner that automatically extends out and presses against the positioning bolt during the process of hoisting and installing the prefabricated stair slab, and precise positioning is achieved by using the positioner and the positioning bolt. The position of the positioning block in the positioner is adjustable, so that the angle and position of the prefabricated stair slab can be adjusted, thereby achieving precise positioning, as well as the effect of correcting and fine-tuning the angle and position of the prefabricated stair slab.

[0015] 2. The positioning device proposed in the present invention has positioners on the lower surfaces of both ends of the prefabricated stair slab, and inserts the first wedge plate and the second wedge plate into the open grooves at different positions respectively. By pressing down the first wedge plate, the prefabricated stair slab can be driven to move in the longitudinal or transverse direction to achieve fine-tuning positioning, which solves the problem of large errors in the hoisting and installation of prefabricated stair slabs and difficulty in correction due to deviations in the installation of positioning bolts during the construction process.

[0016] 3. The positioning device proposed in the present invention has arc-shaped end faces of the positioning blocks on both sides, and the arc-shaped contours of the two positioning blocks are on the same circular contour line. The angle of the prefabricated stair slab is corrected by pressing down the first wedge-shaped plate. At this time, the positioning block at the lower end of the prefabricated stair slab is pressed against the positioning bolts on the lower ladder beam, and the positioning block at the upper end of the prefabricated stair slab is pressed against the positioning bolts on the upper ladder beam. The positioning blocks on both sides can rotate in the area between the two positioning bolts, and prevent the prefabricated stair slab from shaking in the longitudinal direction (referring to the direction of F7 / F8) and the transverse direction (referring to the direction of F9 / F10). This method of adjusting the angle deviation of the prefabricated stair slab facilitates the subsequent adjustment of the longitudinal and transverse position deviations of the prefabricated stair slab, and realizes multi-point anti-sway constraints at the same time.

[0017] 4. The positioning device proposed in the present invention arranges a transmission component in the positioner, and uses the transmission component to drive the positioning blocks on both sides to extend. That is, in the process of the suspended prefabricated stair slab falling onto the ladder beam, if the positioning block does not move, there will be a large gap between the positioning block and the end cap during this process. The existence of this gap can easily cause the landing position of the prefabricated stair slab to shift (especially the prefabricated stair slab in the suspended posture to rotate and shift). However, the positioning blocks on both sides of this process extend out with the falling of the prefabricated stair slab and contact with the end caps on both sides, which can restrain the deviation of the landing position of the prefabricated stair slab, greatly improve the accuracy of positioning, reduce the workload of fine-tuning and correction, and improve assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the positioning device proposed by the present invention (I);

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the positioning device proposed by the present invention (II);

[0020] Figure 3 for Figure 1A schematic diagram of a partially cutaway enlarged structure;

[0021] Figure 4 This is a schematic diagram of the exploded three-dimensional structure of the positioner proposed by the present invention;

[0022] Figure 5 This is a schematic diagram of the front cross-section structure of the positioner proposed by the present invention (I);

[0023] Figure 6 This is a schematic diagram of the front cross-section structure of the positioner proposed by the present invention (II);

[0024] Figure 7 A schematic diagram of the top view of the positioning device proposed by the present invention;

[0025] Figure 8 A partial top view structural schematic diagram of the positioning device proposed by the present invention (I);

[0026] Fig. 9 This is a partial top view structural schematic diagram of the positioning device proposed in the present invention (II).

[0027] In the figure: 1 positioning bolt, 2 prefabricated stair slab, 3 ladder beam, 4 installation shell, 5 positioning block, 6 positioning cavity, 7 center block, 8 connecting rod, 9 adjusting screw, 10 pad, 11 reserved opening, 12 extension part, 13 opening groove, 14 arc surface, 15 same circular contour line, 16 chamfered surface, 17 end cap, 18 conical surface, 19 first wedge plate, 20 second wedge plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Reference Figure 1-9 The invention discloses a precise positioning device for embedded bolts of assembled prefabricated stairs, comprising a positioner and a positioning bolt 1, wherein the positioner is embedded and installed on the lower surface of the prefabricated stair slab 2, and the positioning bolt 1 is embedded in the upper surface of the ladder beam 3.

[0031] Specifically, the lower surfaces of both ends of the prefabricated stair tread 2 are equipped with positioners, and the upper end of the prefabricated stair tread 2 is assembled with two positioning bolts 1 on the upper ladder beam 3 through the positioner, and the lower end of the prefabricated stair tread 2 is assembled with two positioning bolts 1 on the lower ladder beam 3 through the positioner. Figure 1 , Figure 2 .

[0032] See Figure 3 , Figure 4 The positioner proposed in the present invention includes a mounting shell 4, two positioning blocks 5 are slidably mounted inside the mounting shell 4, a transmission assembly is arranged between the two positioning blocks 5, and the positioning blocks 5 are driven by the transmission assembly to extend outward from the mounting shell 4.

[0033] Specifically, the transmission assembly includes a center block 7 and a connecting rod 8. The two connecting rods 8 are rotatably mounted on both sides of the center block 7. The ends of the connecting rods 8 away from the center block 7 are rotatably connected to the positioning block 5. A vertical adjusting screw 9 is internally threadedly mounted on the center block 7. A pad 10 is rotatably mounted on the bottom end of the adjusting screw 9. Figure 5 As shown, the extension distance of the positioning block 5 is determined by the extension length of the bottom end of the adjusting screw 9 and can be adjusted manually.

[0034] An installation cavity is reserved on the lower surface of the prefabricated stair tread 2, and the installation shell 4 is fixedly installed in the installation cavity. The end faces of the installation shell 4 and the inner wall of the installation cavity form two positioning cavities 6. The surface of the prefabricated stair tread 2 is provided with a reserved opening 11 that penetrates the installation shell 4 downward. After the prefabricated stair tread 2 is hoisted and placed on the ladder beam 3, the positioning bolt 1 is inserted into the positioning cavity 6, and the positioning block 5 is pressed against the positioning bolt 1. The positioning cavity 6 plays a role in roughly positioning the prefabricated stair tread 2.

[0035] In this embodiment, see Figure 8 , Fig. 9 The end faces of the two positioning blocks 5 that are away from each other are arc-shaped surfaces 14, and the contours of the arc-shaped surfaces 14 of the two positioning blocks 5 are on the same circular contour line 15. Two positioning bolts 1 are installed on the upper surface of the ladder beam 3, and the distance (L) between the two positioning bolts 1 is smaller than the diameter (2R) of the same circular contour line 15.

[0036] The upper edges of the arcuate surfaces 14 of the two positioning blocks 5 are both provided with chamfered surfaces 16, see Figure 4 .

[0037] An end cap 17 is fixedly installed on the top of the positioning bolt 1, and a conical surface 18 is arranged on the lower side of the end cap 17. When the positioning block 5 extends outward from the mounting shell 4, the chamfered surface 16 contacts the conical surface 18, and a gap is left between the positioning block 5 and the positioning bolt 1. The adjusting screw 9 is tightened, and the chamfered surface 16 provides a downward pressure force for the positioning block 5 to prevent the prefabricated stair slab 2 from tilting and shaking.

[0038] like Figure 5 As shown, the adjusting screw 9 is rotated. Under the action of the force F1 of the adjusting screw 9, the positioning blocks 5 on both sides are pushed to move in the direction F2 through the transmission of the connecting rod 8. The positioning blocks 5 are blocked by the positioning bolts 1. At this time, refer to Figure 7 The prefabricated stair tread 2 moves along the direction F7, or moves along the direction F8, that is, rotating the adjusting screw 9 can drive the prefabricated stair tread 2 to move in the longitudinal direction to achieve fine-tuning positioning. This part is temporarily designated as fine-tuning method one.

[0039] In this embodiment, the upper surfaces of the two positioning blocks 5 are both provided with extension portions 12 , the extension portions 12 extend into the reserved opening 11 , and the surfaces of the extension portions 12 are provided with opening grooves 13 .

[0040] like Figure 6 As shown, the opening groove 13 on the extension portion 12 is provided with a first wedge plate 19 and a second wedge plate 20. The first wedge plate 19 is struck with a hammer to apply a downward force F3 to the first wedge plate 19. After the transmission of the transmission assembly, the right positioning block 5 applies a thrust F5 to the positioning bolt 1. At this time, the prefabricated stair slab 2 moves along the direction F6, that is, by pressing down the first wedge plate 19, the prefabricated stair slab 2 can be driven to move in the transverse direction to achieve fine-tuning positioning. The transverse direction refers to Figure 7 The direction indicated by F9 or F10 in the figure is tentatively designated as the second fine-tuning method.

[0041] The assembly of prefabricated stair slab 2 is divided into two cases:

[0042] In the first case, the suspension of the prefabricated stair slab 2 is aligned with the predetermined installation position, and the embedded position of the positioning bolt 1 is accurate, and no fine-tuning operation is required. Figure 2 , drop the prefabricated stair slab 2;

[0043] By setting a transmission component in the positioner, the transmission component is used to drive the positioning blocks 5 on both sides to extend, that is, in the process of the suspended prefabricated stair slab 2 falling onto the ladder beam 3, the pad 10 preferentially contacts the upper surface of the ladder beam 3. As the distance between the prefabricated stair slab 2 and the ladder beam 3 decreases, the pressure of the adjusting screw 9 on the pad 10 increases, the resistance increases, and the relative position of the center block 7 is relatively fixed. Through the transmission of the connecting rod 8, the positioning blocks 5 on both sides are pushed out. If the positioning blocks 5 do not move, the gap between the positioning blocks 5 and the end caps 17 will be larger during this process. The existence of this gap can easily cause the prefabricated stair slab 2 to shift in the placement position (especially the prefabricated stair slab 2 in the suspended posture to rotate and shift). However, in this process, the positioning blocks 5 on both sides extend out with the falling of the prefabricated stair slab 2 and contact with the end caps 17 on both sides, which can restrain the deviation of the placement position of the prefabricated stair slab 2, greatly improve the accuracy of positioning, reduce the workload of fine-tuning and correction, and improve assembly efficiency.

[0044] In the second case, the hanging posture of the prefabricated stair slab 2 is not aligned with the predetermined installation position, or there is a deviation in the embedded position of the positioning bolt 1, and manual fine-tuning operation is required;

[0045] Fine-tuning operation steps: adjust the hoisting height of the prefabricated stair slab 2, insert each positioning bolt 1 into the corresponding positioning cavity 6, and control the distance between the prefabricated stair slab 2 and the ladder beam 3 to be less than 1CM;

[0046] 1. Adjust the angle of the prefabricated stair slab 2. Figure 7 Insert the first wedge plate 19 and the second wedge plate 20 at D in the middle, and operate according to the above-mentioned fine-tuning method 2, the prefabricated stair slab 2 is Figure 8 The center direction F11 is offset. Figure 7 Insert the first wedge plate 19 and the second wedge plate 20 at B in the figure, and operate according to the above-mentioned fine-tuning method 2. Fig. 9 The center direction is offset to F12, which is not exhaustive here;

[0047] 2. Adjust the offset position of the prefabricated stair slab 2. Figure 7 Insert the first wedge plate 19 and the second wedge plate 20 at A and C in the figure, and operate according to the above-mentioned fine-tuning method 2, the prefabricated stair slab 2 is adjusted according to Figure 7 Move to F9 in the middle direction. Figure 7 Insert the first wedge plate 19 and the second wedge plate 20 at B and D in the figure, and operate according to the above-mentioned fine-tuning method 2, the prefabricated stair slab 2 is adjusted according to Fig. 9 Shift in the middle direction to F10;

[0048] Rotation Figure 7 The adjusting screw 9 between A and B in the precast stair slab is adjusted according to the above-mentioned fine-tuning method 1. Figure 7 F8 in the middle direction, if you rotate Figure 7 The adjusting screw 9 between C and D in the figure is operated according to the above-mentioned fine-tuning method 1, and the prefabricated stair slab 2 is adjusted according to Fig. 9 Shift in the middle direction to F7;

[0049] It should be noted that when performing step 1 and step 2, when the first wedge plate 19 and the second wedge plate 20 inserted at A, B, C, and D conflict with each other (here, when Figure 6 As shown, it is necessary to insert the first wedge plate 19 and the second wedge plate 20 in the opening groove 13 on the right side, and the first wedge plate 19 on the left side can be knocked upward, that is, the first wedge plate 19 moves in the opposite direction of F3, and the prefabricated stair slab 2 is installed to move in the opposite direction of F6, and there is no need to insert the first wedge plate 19 and the second wedge plate 20 in the opening groove 13 on the right side.

[0050] Since the end faces of the positioning blocks 5 on both sides are arcuate surfaces 14, the contours of the arcuate surfaces 14 of the two positioning blocks 5 are on the same circular contour line 15, and the angle of the prefabricated stair slab 2 is corrected by pressing down the first wedge plate 19. At this time, the positioning block 5 at the lower end of the prefabricated stair slab 2 is pressed against the positioning bolt 1 on the lower ladder beam 3, and the positioning block 5 at the upper end of the prefabricated stair slab 2 is pressed against the positioning bolt 1 on the upper ladder beam 3. The positioning blocks 5 on both sides can rotate in the area between the two positioning bolts 1, and prevent the prefabricated stair slab 2 from rotating in the longitudinal direction (referring to F7 / F 8) and lateral directions (referring to the directions of F9 / F10) (what needs strength is that the prefabricated stair slab 2 is suspended by a suspension rope on the upper side, and there are four positioning blocks 5 that press against the end caps 17. After the above-mentioned fine-tuning operation steps, the prefabricated stair slab 2 is in a static suspension posture). This method of adjusting the angular deviation of the prefabricated stair slab 2 provides convenience for the subsequent adjustment of the longitudinal and lateral position deviations of the prefabricated stair slab 2, and at the same time realizes multi-point anti-sway constraints, which is more accurate, quick and labor-saving than manually pushing the prefabricated stair slab 2 to move.

[0051] Finally, the prefabricated stair slab 2 falls onto the ladder beam 3, and the reserved opening 11 is sealed by pouring concrete.

[0052] Positioners are provided on the lower surfaces of both ends of the prefabricated stair slab 2, and a first wedge plate 19 and a second wedge plate 20 are respectively inserted into the open grooves 13 at different positions. By pressing down the first wedge plate 19, the prefabricated stair slab 2 can be driven to move in the longitudinal or transverse direction to achieve fine-tuning positioning, thereby solving the problem of large errors in the hoisting and installation of the prefabricated stair slab 2 and difficulty in correction due to deviations in the installation of the positioning bolts 1 during the construction process.

[0053] The positioning device proposed in the present invention has a positioning block 5 in the positioner that automatically extends out and presses against the positioning bolt 1 during the process of hoisting and installing the prefabricated stair tread 2, and precise positioning is achieved by using the positioner and the positioning bolt 1. The position of the positioning block 5 in the positioner is adjustable, so that the angle and position of the prefabricated stair tread 2 are adjustable, thereby achieving precise positioning, as well as the effect of correcting and fine-tuning the angle and position of the prefabricated stair tread 2.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for accurately positioning embedded bolts of assembled prefabricated stairs, comprising a positioner and a positioning bolt (1), characterized in that: The positioner is embedded and installed on the lower surface of the prefabricated stair slab (2), and the positioning bolt (1) is pre-buried in the upper surface of the stair beam (3); The positioner comprises a mounting shell (4), two positioning blocks (5) are slidably mounted inside the mounting shell (4), a transmission assembly is arranged between the two positioning blocks (5), and the positioning blocks (5) are driven by the transmission assembly to extend outward from the mounting shell (4); The lower surface of the prefabricated stair slab (2) is provided with an installation cavity, and the installation shell (4) is fixedly installed in the installation cavity. The end surfaces of the installation shell (4) and the inner wall of the installation cavity form two positioning cavities (6). After the prefabricated stair slab (2) is hoisted and placed on the ladder beam (3), the positioning bolt (1) is inserted into the positioning cavity (6), and the positioning block (5) is pressed against the positioning bolt (1).

2. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 1 is characterized in that: The transmission assembly comprises a central block (7) and a connecting rod (8). The two connecting rods (8) are rotatably mounted on both sides of the central block (7). The ends of the connecting rods (8) away from the central block (7) are rotatably connected to the positioning block (5).

3. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 2 is characterized in that: The central block (7) is internally threaded with a vertical adjusting screw (9), and a pad (10) is rotatably mounted on the bottom end of the adjusting screw (9). The rotating adjusting screw (9) can drive the prefabricated staircase slab (2) to move in the longitudinal direction to achieve fine-tuning positioning.

4. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 3 is characterized in that: The surface of the prefabricated stair slab (2) is provided with a reserved opening (11) penetrating downwardly through the mounting shell (4), and the upper surfaces of the two positioning blocks (5) are both provided with extension parts (12), the extension parts (12) extend into the reserved opening (11), and the surfaces of the extension parts (12) are provided with opening grooves (13).

5. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 4 is characterized in that: The end surfaces of the two positioning blocks (5) that are away from each other are arcuate surfaces (14), the contours of the arcuate surfaces (14) of the two positioning blocks (5) are on the same circular contour line (15), and two positioning bolts (1) are installed on the upper surface of the ladder beam (3), and the distance between the two positioning bolts (1) is smaller than the diameter of the same circular contour line (15).

6. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 5 is characterized in that: The upper edges of the arc-shaped surfaces (14) of the two positioning blocks (5) are both provided with chamfered surfaces (16).

7. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 6 is characterized in that: An end cap (17) is fixedly mounted on the top end of the positioning bolt (1), and a conical surface (18) is arranged on the lower side of the end cap (17). When the positioning block (5) extends outward from the mounting housing (4), the chamfered surface (16) contacts the conical surface (18), and a gap is left between the positioning block (5) and the positioning bolt (1).

8. The device for accurately positioning embedded bolts of prefabricated stairs according to claim 7 is characterized in that: A first wedge plate (19) and a second wedge plate (20) are inserted into the opening groove (13) on the extension portion (12). By pressing down the first wedge plate (19), the prefabricated staircase plate (2) can be driven to move in a lateral direction to achieve fine-tuning of the positioning.

9. The device for accurately positioning embedded bolts of prefabricated stairs according to any one of claims 1 to 8, characterized in that: The lower surfaces of both ends of the prefabricated stair tread (2) are both equipped with the positioners, the upper end of the prefabricated stair tread (2) is assembled with two positioning bolts (1) on the upper ladder beam (3) through the positioners, and the lower end of the prefabricated stair tread (2) is assembled with two positioning bolts (1) on the lower ladder beam (3) through the positioners.

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