A mobile auxiliary steel bar threading tool and steel bar threading method for prefabricated floor slabs

Abstract

The present invention discloses a mobile auxiliary steel bar threading tool and a steel bar threading method for prefabricated floor slabs, including a telescopic sleeve, a steel bar guiding mechanism, a first traction wire rope, a support pipe and a tensioning clamp. The steel bar guiding mechanism is rotatably connected to the pipe wall of the telescopic sleeve; the first traction wire rope is arranged inside the telescopic sleeve and fixedly connected to the steel bar guiding mechanism; the support pipe and the telescopic sleeve form a T-shaped pipe rack, and a second traction wire rope is arranged inside the support pipe for pulling the first traction wire rope upward; the tensioning clamp is fixed at one end of the support pipe away from the telescopic sleeve, and the tensioning clamp is fixedly connected to the other end of the second traction wire rope. The telescopic sleeve of the present invention can be adjusted according to the floor slab span distance. After the steel bars are laid, the tensioning clamp can make the first traction wire rope pull the steel bar guiding mechanism, and the steel bar guiding mechanism rotates along the telescopic sleeve to reduce its height, thus completing the placement of the steel bars.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated construction in building engineering, and more specifically, to a mobile auxiliary steel bar threading tool and a steel bar threading method for prefabricated floor slabs. Background Art

[0002] With the development of information technology and the promotion of prefabrication in construction, the applications of prefabricated formwork-free, prefabricated composite floor slabs, and steel structure steel bar truss floor slabs are becoming more and more widespread. In the prefabricated floor slabs, the bottom is a precast bottom slab + some truss steel bars. In the construction processes of traditional prefabricated formwork-free, prefabricated composite floor slabs, and steel structure steel bar truss floor slabs, steel bars above φ12 are usually not used for on-site steel bar laying, and the steel bar threading method generally uses a steel bar hook to assist in threading. Due to the cold bending property of steel bars, when the cantilever end is too long, the steel bar will bend downward. When operating workers are threading steel bars, they need to cycle back and forth within the entire span of the slab surface, and need to repeatedly adjust the position of the steel bar to be lifted along the laying direction of the steel bar truss (since protective cushion blocks are provided at the bottom of the steel bar, when the steel bar is too long during the insertion of the steel bar by the worker, one end of it will bend downward. The construction worker needs to adjust at different positions of the steel bar mesh along the steel bar laying direction, hook up the steel bar with a steel bar hook, and bind the steel bars into a mesh form), which consumes a large amount of labor and the steel bar threading efficiency is extremely low.

[0003] Therefore, how to provide a mobile auxiliary steel bar threading tool and a steel bar threading method for prefabricated floor slabs, reduce the labor intensity of construction workers, improve the working efficiency of steel bar threading, and shorten the construction period are problems that need to be urgently solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a mobile auxiliary steel bar threading tool and a steel bar threading method for prefabricated floor slabs, aiming to solve the above technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A mobile auxiliary steel bar threading tool for prefabricated floor slabs, comprising:

[0007] A telescopic sleeve, the telescopic sleeve includes an outer sleeve and an inner lining rod; a through-long chute is opened on the axial pipe wall of the outer sleeve; the number of the inner lining rods is two, and the two inner lining rods are respectively slidably connected to both ends of the outer sleeve, one end of the two inner lining rods extends out of the outer sleeve, and the other end is a sliding end and is arranged in the inner cavity of the outer sleeve;

[0008] A steel bar guiding mechanism, which is arranged on the pipe wall of the outer sleeve and the outer wall of the end of the inner lining rod extending out of the outer sleeve for steel bar transfer;

[0009] The first traction wire rope is arranged in the inner cavity of the outer sleeve pipe, and both ends of the first traction wire rope extend along the outer wall of the inner lining rod. The first traction wire rope is fixedly connected with the steel bar guiding mechanism. By pulling the first traction wire rope, the steel bar guiding mechanism can place the laid steel bars.

[0010] The support pipe, one end of the support pipe is fixed on the outer wall of the telescopic sleeve pipe and forms a T-shaped pipe support with it. A second traction wire rope is axially arranged in the support pipe. One end of the second traction wire rope penetrates through the telescopic sleeve pipe and is fixedly connected with the first traction wire rope, and is used to pull the first traction wire rope upward.

[0011] The tensioning clamp is fixed at one end of the support pipe away from the telescopic sleeve pipe, and the tensioning clamp is fixedly connected with the other end of the second traction wire rope.

[0012] The beneficial effects of the above technical solution are that the telescopic sleeve pipe can be adjusted according to the floor slab span distance. The steel bars are transmitted through the steel bar guiding mechanism from one end of the telescopic sleeve pipe. After the steel bars are laid, the tensioning clamp drives the second traction wire rope to drive the first traction wire rope to contract. The first traction wire rope pulls the steel bar guiding mechanism, and the steel bar guiding mechanism rotates along the telescopic sleeve pipe to reduce its height, completing the placement of the steel bars. The mobile auxiliary steel bar threading tool of the present invention greatly saves the labor intensity of workers during use, improves the efficiency of steel bar installation, and shortens the construction period.

[0013] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool for precast floor slabs, the steel bar guiding mechanism includes an L-shaped mounting plate, a universal wheel and a guide wheel; a plurality of the L-shaped mounting plates are respectively fixed on the pipe wall of the outer sleeve pipe and the end of the inner lining rod extending out of the outer sleeve pipe; the universal wheel is rotatably connected to the outer wall surface of the horizontal plate of the L-shaped mounting plate for driving the L-shaped mounting plate to move; the guide wheel is rotatably connected to the outer wall surface of the vertical plate of the L-shaped mounting plate for transmitting the steel bars; wherein, the first traction wire rope is fixedly connected with a plurality of the L-shaped mounting plates through a through-long chute in the inner cavity of the outer sleeve pipe, and both ends of the first traction wire rope extend along the outer wall of the inner lining rod and are fixedly connected with the L-shaped mounting plate arranged at the end of the inner lining rod. The universal wheel drives the steel bar threading tool to move, and the steel bars are transmitted through the guide wheel, which can ensure that the elevation and position of the steel bars are on the same horizontal plane; after the steel bars are laid, the first traction wire rope is controlled by the tensioning clamp to pull the L-shaped mounting plate upward to make it rotate, thereby reducing the height of the guide wheel and completing the placement work of the steel bars.

[0014] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool for prefabricated floor slabs, a torsion spring is fixed between the inner wall surface of the vertical plate of the L-shaped mounting plate and the pipe wall of the outer sleeve. After the steel bar is placed, when the tensioning clamp is loosened, the torsion spring can automatically reset the L-shaped mounting plate. By pushing the support rod, the steel bar threading tool can be moved to the next position to be threaded, and the next steel bar threading cycle operation can be carried out.

[0015] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and method for prefabricated floor slabs, the torque of the torsion spring is 5-20 N·mm. The torsion spring can automatically reset the L-shaped mounting plate after the steel bar is rotated and placed, avoiding the cumbersome manual reset, reducing the use of labor and lowering the labor intensity.

[0016] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool for prefabricated floor slabs, a first fixing column is vertically fixed on the inner wall at the pipe orifice of the outer sleeve, and a second fixing column is vertically fixed on the outer wall of the sliding end of the inner lining rod. The first fixing column and the second fixing column are arranged in a staggered manner; the first traction wire rope penetrates into the inner cavity of the outer sleeve and extends along the outer wall of the inner lining rod. The first traction wire rope is wound around the first fixing column and the second fixing column in an S shape, so that the first traction wire rope is always in a taut state during the sliding process of the inner lining rod in the outer sleeve. When the length of the telescopic sleeve needs to be adjusted, it is adjusted by sliding the inner lining rod a certain distance in the outer sleeve. During the sliding process of the inner lining rod, the first fixing column remains stationary, which can prevent the inner lining rod from slipping; the second fixing column moves with the inner lining rod, and then drives the first traction wire rope to elongate with the movement of the inner lining rod. During the sliding process of the inner lining rod, the first traction wire rope is always in a taut state, which can effectively pull the L-shaped mounting plate and ensure the effective operation of the tensioning clamp.

[0017] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and method for prefabricated floor slabs, multiple L-shaped mounting plates can all slide along the pipe wall of the outer sleeve through the through-long sliding groove to adjust the distance between adjacent two L-shaped mounting plates. By adjusting the distance between the L-shaped mounting plates, it can meet various steel bar truss spacings after deepening, improve the steel bar threading efficiency, and shorten the construction time.

[0018] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and method for prefabricated floor slabs, the first traction wire rope and the second traction wire rope are thin steel wire ropes or brake wires with a diameter of 5-10 mm. When placing the steel bar on the guide wheel of the L-shaped mounting plate, using a hard wire as the traction wire can effectively pull the L-shaped mounting plate to rotate, thereby reducing the height of the guide wheel and completing the placement work of the steel bar.

[0019] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and steel bar threading method for prefabricated floor slabs, the telescopic sleeve and the support pipe are made of steel pipes, aluminum alloy pipes or 304 stainless steel pipes, which can bear the weight of the steel bars and are convenient and labor-saving to move.

[0020] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and steel bar threading method for prefabricated floor slabs, the outer diameter of the telescopic sleeve is 5 - 8 cm. According to the requirements of the steel bar protection layer at the construction site and combined with the cold bending characteristics of the steel bars themselves, a telescopic sleeve with a suitable outer diameter is selected.

[0021] Preferably, in the above-mentioned mobile auxiliary steel bar threading tool and steel bar threading method for prefabricated floor slabs, the groove width of the guide wheel is 10 - 22 mm, which can adapt to steel bars of different specifications, solves the limitation that only steel bars with a diameter of less than φ12 are used for the laying of floor slab steel bars, and at the same time, one-time steel bar insertion operations can be carried out, avoiding the repetitive work of workers.

[0022] The present invention also provides a mobile auxiliary steel bar threading method for prefabricated floor slabs. The mobile auxiliary steel bar threading tool in the above technical solution is used for steel bar threading, including the following steps:

[0023] S1. Adjust the position of the universal wheels on the telescopic sleeve so that the distance between two adjacent universal wheels adapts to the spacing of the truss steel bars, and ensure that the positions of the universal wheels meet the various truss steel bar spacings after deepening.

[0024] S2. Adjust the telescopic sleeve, and adjust the length of the inner lining rod protruding outside according to the floor slab span, so that the length of the entire telescopic sleeve meets the requirements of the floor slab span.

[0025] S3. One person holds the support pipe and moves it in the direction perpendicular to the truss steel bars; another person threads the steel bars from the end of the floor slab, passes the steel bars through the guide wheels and transfers them to the designated positions for binding and fixing.

[0026] S4. The operator operates the tensioning clamp, so that the second traction wire rope drives the first traction wire rope to have an upward movement trend. The first traction wire rope can pull multiple L-shaped mounting plates to rotate along the outer wall of the telescopic sleeve, thereby lowering the guide wheels to complete the placement of the steel bars.

[0027] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a mobile auxiliary rebar threading tool for prefabricated floor slabs, which can adjust the length of the telescopic sleeve according to the plate spacing of the prefabricated floor slabs, and at the same time can adjust the spacing of the universal wheel on the telescopic sleeve according to the spacing of the steel bar trusses, so as to meet the use requirements of any plate spacing and any steel bar spacing; one person inserts the steel bars from the guide wheel, and the other person holds the support pipe by hand, and uses the tensioning clamp to place the laid steel bars, which greatly saves the labor intensity of the workers, can perform a one-time steel bar insertion, avoids the workers' cyclic operation, improves the work efficiency, and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 A schematic diagram of the structure of the mobile auxiliary reinforcing bar penetration tool provided by the present invention;

[0030] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG.

[0031] Figure 3 A schematic diagram of guide wheel traction provided by the present invention;

[0032] Figure 4 A perspective view of the interior of the telescopic sleeve provided by the present invention;

[0033] in:

[0034] 1- Telescopic sleeve;

[0035] 11-outer sleeve; 12-lining rod;

[0036] 2-support tube; 3-universal wheel; 4-guide wheel; 5-tensioning clamp;

[0037] 6- traction line;

[0038] 61-first traction rope; 62-second traction rope;

[0039] 7-torsion spring; 8-L-shaped mounting plate; 9-second fixing column; 10-first fixing column. DETAILED DESCRIPTION

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1:

[0042] Referring to the attached Figure 1 drawings, an embodiment of the present invention discloses a mobile auxiliary steel bar threading tool for prefabricated floor slabs, including:

[0043] A telescopic sleeve 1, which includes an outer sleeve 11 and an inner lining rod 12; a through-long chute is provided on the axial pipe wall of the outer sleeve 11; the number of inner lining rods 12 is two, and the two inner lining rods 12 are respectively slidably connected to both ends of the outer sleeve 11. One end of the two inner lining rods 12 extends out of the outer sleeve 11, and the other end is a sliding end and is arranged in the inner cavity of the outer sleeve 11;

[0044] A steel bar guiding mechanism, which is rotatably connected to the pipe wall of the outer sleeve 11 and the end of the inner lining rod 12 extending out of the outer sleeve 11;

[0045] A first traction wire rope 61, which is threaded through the inner cavity of the outer sleeve 11 and both ends thereof extend along the outer wall of the inner lining rod 12. The first traction wire rope 61 is fixedly connected to the steel bar guiding mechanism and is used to control the placement of the steel bar by the steel bar guiding mechanism;

[0046] A support pipe 6, one end of the support pipe 6 is fixed on the outer wall of the telescopic sleeve 1 and forms a T-shaped pipe rack with it. A second traction wire rope 62 is axially threaded through the support pipe 6. One end of the second traction wire rope 62 penetrates the telescopic sleeve 1 and is fixedly connected to the first traction wire rope 61 for pulling up the first traction wire rope 61;

[0047] A tensioning clamp 5 is fixed at the end of the support pipe 6 away from the telescopic sleeve 1, and the tensioning clamp 5 is fixedly connected to the other end of the second traction wire rope 62.

[0048] In this embodiment, the length of the outer sleeve 11 is 4m, the total length of the inner lining rod 12 extending out of the outer sleeve 11 is 2m, and the total extended length of the telescopic sleeve can reach 8m, which can meet the requirement of threading steel bars for a slab span of 12m.

[0049] Referring to the attached Figure 2 and 3The steel bar guiding mechanism includes an L-shaped mounting plate 8, a universal wheel 3 and a guide wheel 4; a plurality of L-shaped mounting plates 8 are respectively fixed on the pipe wall of the outer sleeve 11 and the end of the lining rod 12 extending out of the outer sleeve 11; the universal wheel 3 is rotatably connected to the outer wall surface of the horizontal plate of the L-shaped mounting plate 8 for driving the movement of the L-shaped mounting plate 8; the guide wheel 4 is rotatably connected to the outer wall surface of the vertical plate of the L-shaped mounting plate 8 for transmitting steel bars; wherein, the first traction rope 61 is fixedly connected to the plurality of L-shaped mounting plates 8 through a through-length slide groove in the inner cavity of the outer sleeve 11, and the two ends of the first traction rope 61 extend along the outer wall of the lining rod 12 and are fixedly connected to the L-shaped mounting plate 8 arranged at the end of the lining rod 12.

[0050] In order to further optimize the above technical solution, the multiple L-shaped mounting plates 8 can slide along the tube wall of the outer sleeve 11 through the through-length sliding groove to adjust the distance between two adjacent L-shaped mounting plates 8.

[0051] The working principle of the steel bar guiding mechanism is: by adjusting the spacing of the L-shaped mounting plates on the outer sleeve, the spacing of the floor steel bar trusses can be achieved; the steel bars are transferred through the guide wheels, and the steel bars are laid after the transfer is completed. After the steel bars are laid, the second traction rope is pulled by the tensioning clamp, and the second traction rope pulls the first traction rope upward, and the first traction rope pulls multiple L-shaped mounting plates to make them rotate, thereby lowering the height of the guide wheel. After the height of the guide wheel is lowered, the laid steel bars can be automatically placed in place, and the next group of steel bar threading operations can be carried out.

[0052] In order to further optimize the above technical solution and ensure that the L-shaped mounting plate can automatically reset after the reinforcement is placed, a torsion spring 7 is fixed between the inner wall surface of the vertical plate of the L-shaped mounting plate 8 and the pipe wall of the outer sleeve 11.

[0053] In order to further optimize the above technical solution, the torque of the torsion spring 7 is 5 to 20 N·mm.

[0054] See attached Figure 4 A first fixing column 10 is vertically fixed on the inner wall at the pipe mouth of the outer sleeve 11, and a second fixing column 9 is vertically fixed on the outer wall of the sliding end of the lining rod 12, and the first fixing column 10 and the second fixing column 9 are staggered; both ends of the first traction rope 61 are wrapped around the first fixing column 10 and the second fixing column 9 in an S shape along the outer wall of the lining rod 12, so as to keep the first traction rope 61 in a taut state at all times during the sliding process of the lining rod 12 in the outer sleeve 11.

[0055] In order to further optimize the above technical solution, the telescopic sleeve 1 and the support tube 6 are steel tubes, aluminum alloy tubes or 304 stainless steel tubes, which can bear the gravitational potential energy of the steel bars and ensure their durability during use.

[0056] In order to further optimize the above technical solution, the outer diameter of the telescopic sleeve 1 is 5 to 8 cm.

[0057] To further optimize the above technical solution, the groove width of the guide wheel 4 is 10 - 22 mm.

[0058] Example 2:

[0059] The embodiment of the present invention discloses a method for auxiliary movement of steel bar threading for prefabricated floor slabs. The steel bar threading is carried out by using the auxiliary movement steel bar threading tool for prefabricated floor slabs in Example 1, including the following steps:

[0060] S1. Adjust the position of the universal wheels on the telescopic sleeve so that the distance between two adjacent universal wheels adapts to the spacing of the truss steel bars, and ensure that the position of the universal wheels meets the various truss steel bar spacings after deepening;

[0061] S2. Adjust the telescopic sleeve, and adjust the length of the outer leakage of the inner lining rod according to the floor slab span, so that the length of the entire telescopic sleeve meets the requirements of the floor slab span;

[0062] S3. One person holds the support pipe by hand and moves in the direction perpendicular to the truss steel bars; another person threads the steel bars from the end of the floor slab, and transfers the steel bars to the designated position through the guide wheel and binds and fixes them;

[0063] S4. The operator operates the tensioning clamp, so that the second traction wire rope drives the first traction wire rope to have an upward movement trend. The first traction wire rope can drag a plurality of L-shaped mounting plates to rotate along the outer wall of the telescopic sleeve, and then lower the guide wheel to complete the placement of the steel bars.

[0064] Through tests, for the steel bar truss floor slab with a span of 8 m and a steel bar spacing of 200 mm, the steel bar threading operation is carried out. Comparing the steel bar threading operation using this embodiment with the traditional steel bar hook threading operation method:

[0065] Through the comparative analysis and demonstration of the actual on-site installation situation, when the traditional construction process is adopted for the prefabricated steel bar truss floor slab, the work efficiency will be lost by about 15.7% for the installation of single-layer one-way steel bar threading; the work efficiency will be lost by about 27.1% for the installation of double-layer one-way steel bar threading;

[0066] When the mobile auxiliary steel bar threading tool provided by the present invention is used for operation, the work efficiency will be lost by about 5.1% for the installation of single-layer one-way steel bar threading; the work efficiency will be lost by about 10.5% for the installation of double-layer one-way steel bar threading.

[0067] Under the same conditions, compared with the traditional steel bar threading method, using the mobile auxiliary steel bar threading tool can at least double the work efficiency, which greatly improves the construction efficiency, shortens the construction period, and correspondingly reduces the labor cost.

[0068] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0069] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mobile auxiliary steel bar threading tool for prefabricated floor slabs, characterized in that, it includes: A telescopic sleeve (1), the telescopic sleeve (1) includes an outer sleeve (11) and a lining rod (12); a through-long chute is provided on the axial pipe wall of the outer sleeve (11); the number of the lining rods (12) is two, and the two lining rods (12) are respectively slidably connected to both ends of the outer sleeve (11), one end of the two lining rods (12) extends out of the outer sleeve (11), and the other end is a sliding end and is arranged in the inner cavity of the outer sleeve (11); A steel bar guiding mechanism, the steel bar guiding mechanism is arranged on the pipe wall of the outer sleeve (11) and the outer wall of the end of the lining rod (12) extending out of the outer sleeve (11) for steel bar transfer; the steel bar guiding mechanism includes an L-shaped mounting plate (8), a universal wheel (3) and a guiding wheel (4); a plurality of the L-shaped mounting plates (8) are respectively fixed on the pipe wall of the outer sleeve (11) and the outer wall of the end of the lining rod (12) extending out of the outer sleeve (11); the universal wheel (3) is rotatably connected to the outer wall surface of the horizontal plate of the L-shaped mounting plate (8) for driving the L-shaped mounting plate (8) to move; the guiding wheel (4) is rotatably connected to the outer wall surface of the vertical plate of the L-shaped mounting plate (8) for steel bar transfer; A first traction wire rope (61), the first traction wire rope (61) is arranged in the inner cavity of the outer sleeve (11) and its two ends extend along the outer wall of the lining rod (12), and the first traction wire rope (61) is fixedly connected to the steel bar guiding mechanism for controlling the placement of the steel bar by the steel bar guiding mechanism; Wherein, the first traction wire rope (61) is fixedly connected to a plurality of the L-shaped mounting plates (8) through the through-long chute in the inner cavity of the outer sleeve (11), and the two ends of the first traction wire rope (61) extend along the outer wall of the lining rod (12) and are fixedly connected to the L-shaped mounting plate (8) arranged at the end of the lining rod (12); A support pipe (6), one end of the support pipe (6) is fixed on the outer wall of the telescopic sleeve (1) and forms a T-shaped pipe rack with it, a second traction wire rope (62) is axially penetrated in the support pipe (6), and one end of the second traction wire rope (62) penetrates the telescopic sleeve (1) and is fixedly connected to the first traction wire rope (61) for pulling up the first traction wire rope (61); A tensioning clamp (5), the tensioning clamp (5) is fixed at the end of the support pipe (6) far from the telescopic sleeve (1), and the tensioning clamp (5) is fixedly connected to the other end of the second traction wire rope (62); On the inner walls at the orifices of the outer sleeves (11), first fixing columns (10) are vertically fixed. On the outer wall of the sliding end of the inner lining rods (12), second fixing columns (9) are vertically fixed. The first fixing columns (10) and the second fixing columns (9) are arranged in a staggered manner; both ends of the first traction cord (61) are wound around the first fixing columns (10) and the second fixing columns (9) in an S shape along the outer wall of the inner lining rods (12), so that the first traction cord (61) is always in a taut state during the sliding process of the inner lining rods (12) in the outer sleeves (11).

2. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 1, characterized in that, a plurality of the L-shaped mounting plates (8) can all slide along the tube wall of the outer sleeve (11) through the through long chute to adjust the distance between two adjacent L-shaped mounting plates (8).

3. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 1, characterized in that, the groove width of the guide wheel (4) is 10 - 22 mm.

4. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 1, characterized in that, a torsion spring (7) is fixed between the inner wall surface of the vertical plate of the L-shaped mounting plate (8) and the tube wall of the outer sleeve (11).

5. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 4, characterized in that, the torque of the torsion spring (7) is 5 - 20 N·mm.

6. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 1, characterized in that, the telescopic sleeve (1) and the support tube (6) are steel tubes, aluminum alloy tubes or 304 stainless steel tubes.

7. A mobile auxiliary steel bar threading tool for prefabricated floor slabs according to claim 1, characterized in that, the outer diameter of the telescopic sleeve (1) is 5 - 8 cm.

8. A mobile auxiliary steel bar threading method for prefabricated floor slabs, using the mobile auxiliary steel bar threading tool for prefabricated floor slabs according to any one of claims 1 to 7 for steel bar threading, comprising the following steps: S1. Adjust the steel bar guiding mechanism to adapt to the spacing of the truss steel bars; S2. Adjust the telescopic sleeve to make its length adapt to the floor slab span spacing; S3. Transfer the steel bars to the designated positions through the steel bar guiding mechanism and bind and fix them; S4. Operate the tensioning fixture to place the steel bars.

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