A strand threading device

Abstract

The utility model relates to steel strand technical field, and disclose a kind of steel strand threading device, including threading top hat and threading bottom cap, the lower end inside surface of threading top hat is provided with internal thread, the upper end outside wall of threading top hat is provided with the external thread matched with the internal thread, threading top hat and threading bottom cap are threadedly connected, the lower bottom surface of threading bottom cap is provided with several threading holes, anchor plate is provided in threading bottom cap, several fixing holes are provided in the anchor plate, clamping piece is provided in the fixing hole, steel strand passes through the threading hole and fixing hole in sequence, and is fixed with the clamping piece. The utility model mainly solves the problems, such as low efficiency, great labor intensity, unstable quality, and big quality hidden danger, complex construction, high cost and poor flexibility of mechanical whole bundle threading welding.

Description

Technical Field

[0001] This utility model relates to the field of steel strand technology, specifically a steel strand threader. Background Technology

[0002] In the construction of unbonded prestressed steel strands, the steel strands need to be threaded into the prestressed ducts. Currently, the threading process is mostly carried out manually one strand at a time or mechanically threaded in bundles. Manual threading requires workers to push the steel strands one by one into the duct using their hands or simple tools like crowbars, relying on manual labor to overcome the friction between the duct wall and the steel strands. This process is inefficient and labor-intensive. Mechanically threaded bundles require arranging multiple steel strands neatly on the ground according to design requirements, fixing them into a single bundle by welding, and then firmly connecting the traction wire to one end of the bundle using welding. Then, traction machinery is used to pull the bundle until all the strands are threaded into the duct. If the welding process is improper or the welding parameters are not set reasonably, problems such as weak welds or incomplete welds can easily occur. During traction, the traction wire may detach from the steel strands, affecting the threading progress and even causing safety accidents. At the same time, the high temperature generated during welding may damage the mechanical properties of the steel strands, reducing their load-bearing capacity. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a steel strand threading device, which mainly solves the problems of low efficiency, high labor intensity, and unstable quality of manual strand threading, as well as the high risk of quality issues, complex construction, high cost, and poor flexibility of mechanical whole-strand threading and welding.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a steel strand threading device, comprising a threading top cap and a threading bottom cap, wherein the lower inner side of the threading top cap is provided with an internal thread, and the upper outer side wall of the threading bottom cap is provided with an external thread that mates with the internal thread; the threading top cap and the threading bottom cap are threadedly connected; the lower bottom surface of the threading bottom cap is provided with several threading holes; an anchoring plate is provided inside the threading bottom cap; several fixing holes are provided on the anchoring plate; a clamping member is provided inside the fixing holes; the steel strand passes through the threading holes and the fixing holes in sequence and is fixed to the clamping member.

[0005] The aforementioned structural design, employing a mechanical combination of a top cap, bottom cap, anchoring plates, and clamping components to secure the steel strands, completely eliminates the risk of detachment due to weak welding, significantly improving the safety and reliability of the traction process. Simultaneously, it completely prevents damage to the mechanical properties of the steel strands caused by high welding temperatures, ensuring the final load-bearing capacity of the prestressed structure. This device allows operators to quickly and easily thread multiple steel strands through the threading holes on the ground and secure them using clamping components, forming a robust, integrated bundle. Compared to manual threading of individual strands, this method is significantly more efficient; compared to mechanically threading entire bundles, it eliminates the tedious and technically demanding welding work, reducing the skill requirements and labor intensity for workers.

[0006] Preferably, a cold shrink sleeve is provided on the outside of the top cap and the bottom cap of the threading device, and the cold shrink sleeve includes a support bar and a sleeve sleeved on the outside of the support bar.

[0007] With the above structural design, the cold shrink tubing tightly wraps around the outside of the connector, which can further secure the top and bottom caps of the threading device into a whole, preventing the threaded connection from loosening due to vibration or impact during the threading process. The cold shrink tubing wraps around each component of the threader and the front end of the steel strand, using its shrinkage characteristics to enhance sealing and stability. The tubing provides a smooth and continuous transition surface, which can effectively reduce the frictional resistance with the prestressed pipe hole wall during the threading process, making the threading process smoother.

[0008] Preferably, the clamping member has multiple pressing portions, and the inner wall of the clamping member is provided with multiple rings of anti-slip teeth.

[0009] With the above structural design, the multiple anti-slip teeth on the inner wall of the clamping member can clamp the surface of the steel strand, greatly increasing the friction and providing a clamping force far exceeding that of a smooth inner wall, effectively preventing the steel strand from being pulled out or sliding when subjected to huge traction force.

[0010] Preferably, the upper end of the top cap is provided with a traction connection hole.

[0011] With the above structural design, the traction connection hole provides a convenient and robust connection position for standard traction tools, enabling the strand threader to connect quickly and safely to external traction machinery. A non-welded mechanical traction threading method is used, with the traction rope connected to the threading cap, driving the threader to complete the threading of the steel strands.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By using a mechanical combination of top and bottom caps, anchor plates, and clamps to secure the steel strands, the risk of detachment due to weak welding is completely eliminated, greatly improving the safety and reliability of the traction process. Simultaneously, it completely eliminates damage to the mechanical properties of the steel strands caused by high welding temperatures, ensuring the final load-bearing capacity of the prestressed structure. Compared to manual pushing of each strand individually, this method significantly reduces manpower consumption, substantially improves strand threading efficiency, effectively shortens the construction cycle, reduces worker fatigue, and avoids safety accidents caused by physical exhaustion. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0015] Figure 2 This is an exploded view of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the threaded top cap of this utility model;

[0017] Figure 4 This is a top view of the cap with a beaded bottom according to this utility model;

[0018] Figure 5 This is a top view of the anchoring plate of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the clamping component of this utility model;

[0020] Figure 7 This is a schematic diagram of the internal structure of the clamping component of this utility model;

[0021] Figure 8 This is a schematic diagram of the structure of the cold shrink tubing of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-8 This utility model provides a steel strand threading device. The steel strand threading device mainly includes a threading top cap 1, a threading bottom cap 2, an anchoring plate 3, and a clamping component 4. The threading top cap 1, threading bottom cap 2, anchoring plate 3, and clamping component 4 are made of metal, but can also be replaced with alloy materials or engineering plastics that meet the requirements for strength and wear resistance.

[0024] As attached Figure 1and attached Figure 2 As shown, the device includes a top cap 1 and a bottom cap 2. The bottom inner side of the top cap 1 is provided with an internal thread 101, and the top outer side of the bottom cap 2 is provided with an external thread 201 that mates with the internal thread 101. The top cap 1 and the bottom cap 2 are threaded together. The threaded connection structure of the top cap 1 and the bottom cap 2 ensures the stability of each component during the threading process, keeps the steel strand 6 in a straight state in the channel, accurately controls the threading direction and force, avoids twisting and bending, and ensures the stress performance and structural safety of the steel strand 6. The bottom surface of the bottom cap 2 has several threading holes 202. An anchor plate 3 is provided inside the bottom cap 2. Several fixing holes 301 are provided on the anchor plate 3. Clamping members 4 are provided in the fixing holes 301. The steel strand 6 passes through the threading holes 202 and the fixing holes 301 in sequence and is fixed with the clamping members 4. The top cap 1 and the bottom cap 2 of the threading are fitted with a cold shrink sleeve 5. The cold shrink sleeve 5 includes a support bar 502 and a sleeve 501 fitted on the outside of the support bar 502.

[0025] As attached Figure 3 As shown, the top cap 1 is a conical structure with an internal thread 101 machined on the inner side of its lower end and a traction connection hole 102 opened at the center of its upper end for connecting external traction equipment.

[0026] As attached Figure 4 As shown, the bottom cap 2 is also a cylindrical structure, with an external thread 201 on its upper outer wall that matches the internal thread 101 of the top cap 1, allowing the two to be securely screwed together. The bottom surface of the bottom cap 2 has multiple threading holes 202 matching the number of steel strands for the steel strands 6 to pass through.

[0027] As attached Figure 5 As shown, a disc-shaped anchor plate 3 is placed inside the cavity of the threading cap 2. The anchor plate 3 has fixing holes 301, the number and position of which correspond to the threading holes 202.

[0028] As attached Figure 6 and attached Figure 7 As shown, a conical clamping member 4 is placed within each fixing hole 301. The inner wall of the clamping member 4 is machined with multiple rings of densely packed anti-slip teeth 401 to greatly increase the friction with the surface of the steel strand 6. A U-shaped groove is formed on the lower outer wall of the clamping member 4, and a rubber ring is installed within the U-shaped groove to connect the three clamping parts of the clamping member 4. The clamping member 4 forms multiple radial compression parts for clamping the steel strand 6.

[0029] As attached Figure 8As shown, a cold-shrink sleeve 5 is fitted over the outer sides of the threading top cap 1 and the threading bottom cap 2. The cold-shrink sleeve 5 includes a support bar 502 and a sleeve 501 fitted over the support bar 502. The cold-shrink sleeve 5 is fitted over the threading top cap 1, the threading bottom cap 2, and the front end of the steel strand to be threaded. The removable support bar 502 is then pulled out, causing the sleeve 501 to tightly shrink and wrap around all components. The sleeve 501 can be made of silicone rubber, EPDM rubber, or other rubber materials or heat-shrink materials with good elasticity and shrinkage properties.

[0030] Working principle:

[0031] (1) Preparation: Arrange the steel strands 6 to be threaded neatly, strip some of the outer steel wires of the steel strands 6, leaving only the central main steel wire. Determine the number of threading holes 202 reserved at the bottom of the threading cap 2 and the number of fixing holes 301 reserved in the anchor plate 3 according to the number of steel strands 6. Prepare the corresponding threading cap 2 and anchor plate 3 in advance. Check the condition of each component, including the threading top cap 1, threading bottom cap 2, anchor plate 3, clamping part 4, and cold shrink sleeve 5, to ensure that they are intact. Pass the traction rope through the traction connection hole 102 at the top of the threading top cap 1 for later use.

[0032] (2) Assemble the components: Place the anchor plate 3 inside the bottom cap 2, pass the steel strand 6 through the pre-drilled hole at the bottom of the bottom cap 2 and the pre-drilled hole of the anchor plate 3 in sequence, and then put the 3 clamping pieces 4 along the steel strand 6 so that the anti-slip teeth on the inner side of the clamping pieces 4 fit tightly with the steel strand 6.

[0033] (3) Connection and fixing: Connect the top cap 1 and the bottom cap 2 of the cable through the internal thread to wrap the anchor plate 3 and the clamping member 4, so that the anchor plate 3 and the clamping member 4 clamp the steel strand.

[0034] (4) Apply cold shrink tubing: Apply cold shrink tubing 5 to the top cap 1, bottom cap 2 and the front end of the steel strand 6 to be threaded, and pull out the internal removable plastic support strip 502 so that the tubing 501 tightly shrinks and wraps around each component.

[0035] (5) Traction and threading: Connect the traction rope to the external traction equipment (such as a winch), start the traction equipment, and the traction rope pulls the threader through the traction connection hole 102 on the threading cap 1, driving the steel strand 6 to move along the prestressed pipe until all the steel strands are threaded into the pipe to complete the threading work.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel strand threader, characterized in that: The device includes a top cap (1) and a bottom cap (2). The bottom inner side of the top cap (1) is provided with an internal thread (101), and the top outer side wall of the bottom cap (2) is provided with an external thread (201) that matches the internal thread (101). The top cap (1) and the bottom cap (2) are threaded together. The bottom surface of the bottom cap (2) is provided with several wire holes (202). An anchor plate (3) is provided inside the bottom cap (2). Several fixing holes (301) are provided on the anchor plate (3). A clamping member (4) is provided inside the fixing hole (301). The steel strand (6) passes through the wire hole (202) and the fixing hole (301) in sequence and is fixed with the clamping member (4).

2. The steel strand threader according to claim 1, characterized in that: The top cap (1) and bottom cap (2) of the threading are fitted with a cold shrink sleeve (5), which includes a support bar (502) and a sleeve (501) fitted on the outside of the support bar (502).

3. The steel strand threader according to claim 1, characterized in that: The clamping member (4) has multiple pressing parts, and the inner wall of the clamping member (4) is provided with multiple anti-slip teeth (401).

4. A steel strand threader according to claim 1, characterized in that: The upper end of the top cap (1) is provided with a traction connection hole (102).

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