Traction device and method for steel strand bundle

Abstract

The invention discloses a traction device and method for a steel strand bundle, and belongs to the technical field of prestressed steel strand penetrating, the traction device comprises a sleeve and a traction wire, the traction wire penetrates through the sleeve, one end of the traction wire is provided with a traction end, the traction device is characterized in that the other end of the traction wire is provided with an extrusion block, and the extrusion block is provided with an extrusion hole. The extrusion block is located in the steel strand bundle, the steel strand bundle is sleeved with a restraint ring, the restraint ring is located at the extrusion block, and the outer diameter of the part, wrapping the extrusion block, of the steel strand bundle is larger than the inner diameter of the restraint ring; the sleeve is arranged at the top end of the steel strand bundle in a sleeving mode and located at the extrusion block, and the inner diameter of the sleeve is smaller than the inner diameter of the restraint ring and larger than the sum of the outer diameter of the pull wire and the two times of the outer diameter of a steel strand in the steel strand bundle. According to the traction device and method for the steel strand bundle, on the basis of simply and efficiently pulling the steel strand bundle, the clamping degree of the steel strand bundle is improved, and the steel strand bundle is prevented from falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of prestressed steel strand threading, and in particular to a traction device and method for a steel strand bundle. Background Art

[0002] In modern post-tensioned prestressed engineering structures, the prestressing tendons usually adopt multiple steel strands arranged in a bundle. The steel strands may be bonded steel strands, unbonded steel strands or slow-bonded steel strands. During the construction stage, the steel strands need to be installed at the designed positions, such as in the reserved ducts, inside the steel bar skeletons or outside the concrete. Generally, two methods, namely single-strand pushing and bundle traction, can be selected according to factors such as site conditions, steel strand types, duct types, etc. to achieve this. When the bundle traction threading method must be used, a traction device needs to be set or installed at the traction end of the bundled steel strands and connected to the traction equipment to realize the bundle traction operation. The traction device should be able to connect each steel strand into an integral whole to jointly bear the force and ensure that the steel strands will not fall off during the traction process.

[0003] In the prior art, the steel strand traction devices mainly adopt two methods: head butt connection and anchor connection. For the head butt connection, the peripheral wires at the traction end of each steel strand are cut off and only the middle wire is retained. After passing through the perforated annular end plate, each wire is headed by a wire heading machine to form an anchor, and then the annular end plate is connected to the traction equipment through a special nut connector to realize the traction of the bundled steel strands. This method has reliable force transmission, but it requires preparing heading equipment on site, the process is relatively complex, the operation time is long, and the accuracy requirement for heading is high. For the anchor connection, a multi-hole anchor is installed at the traction end of the steel strand, and a traction hook is installed on the anchor or the bearing plate. After connecting the traction hook to the traction equipment, the traction of the bundled steel strands can be realized. This method has reliable anchoring, but the positions of the anchor holes are scattered, resulting in a large size of the traction head, and it can only be used under very few conditions where the space allows.

[0004] The prior art with the Chinese patent document publication number CN207919904U discloses an integral traction fixture, including a traction head, a clamping sleeve, a traction wire and a limiting plate; the traction wire is located at the center of the steel strand, surrounded by the steel strand, and extends to the traction head. The traction head is located at one end of the traction wire and forms a detachable fixed connection with the traction wire; the clamping sleeve is located on the periphery of the steel strand, and the traction wire and the steel strand penetrate through the clamping sleeve and are in close fit with the clamping sleeve; the limiting plate is located on one side of the clamping sleeve and cooperates with the traction wire and the steel strand. This integral traction fixture can solve the problems encountered in the two connection methods of head butt connection and anchor connection, and can simply and efficiently perform steel strand threading and reduce the limitation of the threading space. However, it is found in actual applications that in some cases, the steel strand bundle will fall off during the traction process by this integral traction fixture. The main reason is that the clamping degree of the clamping sleeve on the steel strand is insufficient. Once the steel strand bundle falls off, it will not only lead to the failure of the traction work, but also seriously affect the efficiency of the traction work.

[0005] Based on this, there is an urgent need for an integral traction device that can simply and efficiently thread steel strands and avoid the shedding of steel strands, so as to improve the overall efficiency of the traction work. Summary of the Invention

[0006] Based on the above, in view of the technical problem of how to simply and efficiently thread steel strands and avoid the shedding of steel strand bundles, the present invention provides a traction device and method for steel strand bundles. On the basis of ensuring simple and efficient threading of steel strands, through the cooperation of an extrusion block and a restraint ring, a primary clamping force is generated on the steel strand bundle; at the same time, through the cooperation of the extrusion block and a sleeve, a secondary clamping force is generated on the steel strand bundle. The double clamping structure formed by the cooperation of the restraint ring and the sleeve with the extrusion block improves the clamping degree of the steel strand bundle by applying two clamping forces to the steel strand bundle, ensures the stable connection between the traction device and the steel strand bundle, and avoids the shedding of the steel strand bundle during the traction process.

[0007] The present invention adopts the following technical solutions to solve the above technical problems:

[0008] In a first aspect of the present application, a traction device for a steel strand bundle is provided, including a sleeve and a traction wire. The traction wire passes through the sleeve, and a traction end is provided at one end of the traction wire. It is characterized in that an extrusion block is provided at the other end of the traction wire. The extrusion block is located within the steel strand bundle. A restraint ring is sleeved on the steel strand bundle and the restraint ring is located at the position of the extrusion block. The outer diameter of the steel strand bundle wrapping the extrusion block is greater than the inner diameter of the restraint ring; the sleeve is sleeved on the top of the steel strand bundle and the sleeve is located at the position of the extrusion block. The inner diameter of the sleeve is less than the inner diameter of the restraint ring and greater than the sum of the outer diameter of the traction wire and twice the outer diameter of the steel strands in the steel strand bundle.

[0009] Preferably, the restraint ring is a hose clamp, and the hose clamp includes a hoop band. A nut is provided at one end of the hoop band, and a worm is provided in the nut. The other end of the hoop band passes through the through hole in the nut and forms a worm connection with the worm.

[0010] Preferably, the extrusion block includes a cylindrical section and a conical section. The conical section is provided at one end of the cylindrical section, and the conical section is adjacent to the sleeve.

[0011] Preferably, a reinforcing ring is provided at the end of the sleeve adjacent to the extrusion block.

[0012] Preferably, the sleeve includes a cylindrical section and a conical section. The conical section is provided at one end of the cylindrical section, and the conical section is adjacent to the traction end.

[0013] Preferably, the extrusion block is threadedly connected to the traction wire, and the traction end is threadedly connected to the traction wire.

[0014] Preferably, the material of the traction device is a steel product.

[0015] Preferably, the number of steel strands in the steel strand bundle is greater than or equal to 5.

[0016] The second aspect of the present application provides a method for pulling a steel strand, including the following steps:

[0017] S1: After the traction line passes through the sleeve, a traction end is installed at one end of the traction line, and an extrusion block is installed at the other end;

[0018] S2: The extrusion block passes through the restraint ring and is inserted into the steel strand bundle, and the restraint ring is sleeved on the steel strand bundle;

[0019] S3: The restraint ring is pushed to the extrusion block, the outer diameter of the steel strand bundle wrapping the extrusion block is greater than the inner diameter of the restraint ring, and the extrusion block and the restraint ring form a primary clamping of the steel strand bundle;

[0020] S4: The sleeve is sleeved on the top of the steel strand bundle and pushed to the extrusion block, the inner diameter of the sleeve is smaller than the inner diameter of the restraint ring, and the extrusion block and the sleeve form a secondary clamping of the steel strand bundle;

[0021] S5: The traction end is connected to the traction hook of the traction device;

[0022] S6: Start the traction device and pull the steel strand bundle to move in the traction direction;

[0023] S7: After moving to the designated position, remove the traction device and the traction work is completed.

[0024] Preferably, the traction line is a steel strand, the extrusion block is an extrusion anchor, the traction end is an extrusion anchor, and the restraint ring is a steel wire or an iron wire.

[0025] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0026] 1. The double clamping structure in the traction device of the steel strand bundle of the present invention provides a higher clamping degree for the steel strand bundle by applying two clamping forces to the steel strand bundle, avoiding the shedding of the steel strand bundle.

[0027] The double clamping structure in the traction device of the steel strand bundle of the present invention specifically refers to the clamping structure formed by the cooperation of the restraint ring and the extrusion block and the clamping structure formed by the cooperation of the sleeve and the extrusion block.

[0028] Since the extrusion block is located within the steel strand bundle, a restraint ring is sleeved on the steel strand bundle, and the outer diameter of the steel strand bundle at the position where it wraps the extrusion block is greater than the inner diameter of the restraint ring. When the restraint ring is pushed to the position of the extrusion block, the extrusion block and the restraint ring will exert a clamping force on the steel strand bundle once. At the same time, a sleeve is also sleeved on the top end of the steel strand bundle. When the sleeve is pushed to the position of the extrusion block, since the inner diameter of the sleeve is smaller than the inner diameter of the restraint ring, the extrusion block and the sleeve will exert a second clamping force with a higher clamping degree on the steel strand bundle. Compared with the clamping sleeve in the prior art, the traction device for the steel strand bundle of the present invention, based on a simple and efficient threading of the steel strand, utilizes a double clamping structure formed by the cooperation of the restraint ring and the sleeve with the extrusion block to exert a clamping force on the steel strand bundle twice, providing a higher clamping degree for the steel strand bundle, enabling the traction device to be more firmly connected to the steel strand bundle, and thus avoiding the detachment of the steel strand bundle during the traction process.

[0029] 2. In the traction device for the steel strand bundle of the present invention, the restraint ring is a hose clamp. By adjusting the size of the inner diameter of the hose clamp, the clamping degree on the steel strand bundle can be further improved. Additionally, as the thrust of the sleeve increases, the depth of the extrusion block entering the sleeve increases, the area generating the clamping force increases, and the clamping force exerted by the extrusion block and the sleeve on the steel strand bundle also becomes greater. Moreover, the conical section of the extrusion block is beneficial for increasing the depth of the extrusion block entering the sleeve, further increasing the clamping degree on the steel strand bundle, thereby further enhancing the stability of the connection between the traction device and the steel strand bundle and avoiding the detachment of the steel strand bundle during the traction process. Furthermore, the conical section of the extrusion block is also beneficial for quickly pushing the restraint ring and the sleeve to the position of the extrusion block, improving the efficiency of the traction work.

[0030] 3. In the overall traction device for the steel strand bundle of the present invention, the steel strand bundle is constrained within the sleeve, as Figure 6As shown, the steel strand is in tangential contact with the inner wall of the sleeve. Compared with the steel strands that are dispersed when connected by the existing anchor, the steel strands in the overall traction device of the steel strand bundle of the present invention are closely distributed, effectively reducing the size of the overall traction device, especially the cross-sectional size, thus effectively reducing the limitation of the space for threading the bundle. The reinforcing ring can effectively prevent the rupture of the sleeve end when the clamping pressure is too high, thus ensuring the stability of the connection between the traction device and the steel strand bundle; the gradual shape of the conical section of the sleeve is conducive to the threading of the overall traction device in the duct, avoiding the overall traction device being stuck by a large step in the duct. Moreover, the conical section at the front end of the threading is less resistant at the bend of the duct because it can naturally conform to the bending direction of the duct, reducing excessive friction and collision with the inner wall of the duct, thereby improving the success rate of threading; the extrusion block is threadedly connected to the traction wire, enabling the selection of an extrusion block with a suitable size according to the thickness and quantity of the steel strands, expanding the application range of the traction device; the traction end is threadedly connected to the traction wire, facilitating the connection and disassembly with the traction equipment. Especially compared with the anchor connection, the diameter of the traction device of the present invention can be smaller than the inner diameter of the reserved threading duct, and the length of the rigid connection of the overall traction device is short, and it is hardly affected by the duct curvature.

[0031] 4. The traction method of the steel strand bundle of the present invention uses the restraint ring to cooperate with the sleeve and the extrusion block to clamp the steel strand bundle twice, enhancing the stability of the connection with the steel strand bundle and avoiding the shedding of the steel strand bundle during traction. At the same time, the traction method of the present invention is simple to operate, has low requirements for the arrangement of the steel strand bundle, and does not require the ends of the steel strand bundle to be strictly aligned. The traction work efficiency is high. The traction method has a wide application range, does not limit the use position of the steel strands, and can be used inside and outside the duct and inside and outside the steel bar framework; it does not limit the types of steel strands, and bonded steel strands, unbonded steel strands or slow-bonded steel strands can all be used; it does not limit the upper limit of the number of steel strands to be tractioned.

[0032] 5. The traction method of the steel strand bundle of the present invention, in the case of relatively simple threading conditions, only requires the preparation of a sleeve suitable for the threading duct, and other main materials can be obtained from the post-tensioned prestressed engineering site, further improving the work efficiency and adaptability of the steel strand bundle traction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a three-dimensional structural schematic diagram of the traction device of the steel strand bundle in Embodiment 1 of the present invention;

[0034] Figure 2 is a partial plane schematic diagram before traction of the traction device of the steel strand bundle in Embodiment 1 of the present invention Figure 1 ;

[0035] Figure 3 is a partial plane schematic diagram before traction of the traction device of the steel strand bundle in Embodiment 1 of the present invention Figure 2 ;

[0036] Figure 4 Schematic plan view during traction of the traction device for the steel strand bundle in Embodiment 1 of the present invention;

[0037] Figure 5 Cross-sectional view at the restraint ring of the traction device for the steel strand bundle in Embodiment 1 of the present invention in the traction state;

[0038] Figure 6 Cross-sectional view at the strengthening ring of the traction device for the steel strand bundle in Embodiment 1 of the present invention in the traction state;

[0039] Figure 7 Partial schematic plan view before traction of the traction device for the steel strand bundle in Embodiment 2 of the present invention;

[0040] Figure 8 Schematic three-dimensional structure view of the throat hoop in the traction device for the steel strand bundle in Embodiment 2 of the present invention;

[0041] Figure 9 Flow chart of the traction method for the steel strand bundle of the present invention.

[0042] Explanation of reference numerals:

[0043] 1. Traction wire; 2. Sleeve; 21. Cone section; 22. Cylinder section; 23. Strengthening ring; 3. Extrusion block; 31. Cylindrical section; 32. Conical section; 4. Traction end; 5. Restraint ring; 6. Steel strand; 7. Traction equipment; 8. Traction hook; 9. Throat hoop; 91. Hoop band; 92. Worm; 93. Nut. Detailed implementation manners

[0044] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 thus should not be construed as a limitation to the present invention.

[0046] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] It should be noted that when an element is referred to as "fixed" or "set" on another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0048] Embodiment 1

[0049] Refer to Figures 1 - 6 , Embodiment 1 of the present application provides a traction device for a steel strand bundle, including a traction wire 1, a sleeve 2, a pressing block 3, a traction end 4, and a restraint ring 5.

[0050] The sleeve 2 includes a cylindrical section 22 and a conical section 21. The sleeve 2 is axially hollow, and a traction wire 1 is passed through the hollow part. The traction wire 1 can move axially along the sleeve 2. A traction end 4 is fixedly arranged at one end of the traction wire 1, and the traction end 4 is threadedly connected to the traction wire 1. The conical section 21 of the sleeve 2 is arranged at one end of the cylindrical section 22, and the conical section 21 is adjacent to the traction end 4. A pressing block 3 is fixedly arranged at the other end of the traction wire 1. The pressing block 3 includes a cylindrical section 31, and the traction wire 1 is threadedly connected to the pressing block 3. A restraint ring 5 is arranged between the sleeve 2 and the pressing block 3. A reinforcing ring 23 is arranged at the end of the cylindrical section 22 adjacent to the pressing block 3, and the reinforcing ring 23 is used to strengthen the structural strength of the end of the cylindrical section 22.

[0051] Before traction, as Figure 2As shown, align and arrange the tops of 6 steel strands 6 to form a steel strand bundle. First, pass one end of the towing line 1 with the extrusion block 3 through the restraint ring 5, and then insert it into the center of the steel strand bundle, so that the extrusion block 3 is surrounded by 6 steel strands 6 and the centers of the 6 steel strands 6 form a regular hexagon as much as possible. Then, put the restraint ring 5 on the steel strand bundle from the top of the steel strand bundle and move it near the extrusion block 3. Next, insert the top of the steel strand bundle into the sleeve 2, and move the extrusion block 3, the restraint ring 5 and the sleeve 2 to relatively appropriate positions. In order to insert the top of the steel strand bundle into the sleeve 2, the inner diameter of the sleeve 2 needs to be greater than the sum of the outer diameter of the towing line 1 and twice the outer diameter of the steel strand 6. It should be noted that it is also possible that the inner diameter of the sleeve 2 is slightly smaller than the sum of the outer diameter of the towing line 1 and twice the outer diameter of the steel strand 6. For example, when there are 5 steel strands 6 in the steel strand bundle, the inner diameter of the sleeve 2 is greater than the outer diameter of the part of the steel strand bundle that only wraps the towing line 1 but smaller than the sum of the outer diameter of the towing line 1 and twice the outer diameter of the steel strand 6 in the steel strand bundle.

[0052] Then use a suitable tool, such as a hammer, to push the restraint ring 5 to the extrusion block 3. The outer diameter of the part of the steel strand bundle that wraps the extrusion block 3 is greater than the inner diameter of the restraint ring 5. The extrusion block 3 and the restraint ring 5 will generate a clamping force on the steel strand bundle, as Figure 3 and Figure 5 shown. Then use a suitable tool to push the sleeve 2 to the extrusion block 3. The inner diameter of the sleeve 2 is smaller than the inner diameter of the restraint ring 5. The extrusion block 3 and the sleeve 2 will generate a second clamping force with a higher clamping degree on the steel strand bundle, as Figure 4 and Figure 6 shown. At the same time, as the depth of the extrusion block 3 entering the sleeve 2 increases, the area generating the clamping force increases, and the clamping force generated by the extrusion block 3 and the sleeve 2 on the steel strand bundle also becomes larger and larger.

[0053] After the steel strand bundle forms a firm connection with the towing device, connect the towing end 4 of the towing line 1 to the towing hook 8 of the towing equipment 7, start the towing equipment 7, and the steel strand bundle moves in the towing direction with the towing device.

[0054] After towing to the designated position, the towing equipment 7 stops working, and disconnect the connection between the towing end 4 and the towing hook 8. Use a suitable tool, such as a hammer, to first strike the edge of the sleeve 2 to make the sleeve 2 move away from the extrusion block 3 and fall off, so that the steel strand bundle can quickly exit the sleeve 2. Strike the edge of the restraint ring 5 in the same way to make the steel strand bundle quickly exit the restraint ring 5. After canceling the restraint of the sleeve 2 and the restraint ring 5 on the steel strand bundle, the clamping force of the steel strand bundle on the extrusion block 3 in a wrapping manner will be synchronously canceled, which is convenient for easily pulling out the extrusion block 3 and withdrawing the towing line 1, completing the disassembly of the towing tool, and the towing work is completed.

[0055] The double clamping structure of the traction device applies two clamping forces to the steel strand bundle, providing a higher clamping degree for the steel strand bundle, enabling the traction device to be more firmly connected to the steel strand bundle, and thus avoiding the shedding of the steel strand bundle during the traction process. At the same time, compared with the existing butt - head connection and anchor connection in the prior art, the double clamping structure of the traction device does not require special equipment, and the installation and disassembly processes are simple, and the threading and traction of the steel strand bundle can be carried out simply and efficiently.

[0056] Embodiment 2

[0057] This embodiment is generally the same as Embodiment 1, except that the extrusion block 3 further includes a conical section 32. The conical section 32 is arranged at one end of the cylindrical section 31, and the conical section 32 is adjacent to the sleeve 2, as Figure 7 shown. The restraint ring 5 is a hose clamp 9. The hose clamp 9 includes a strap 91, a worm 92 and a nut 93. A nut 93 is arranged at one end of the strap 91, the worm 92 is arranged in the nut 93, and the other end of the strap 91 passes through the through - hole in the nut 93 and forms a worm connection with the worm 92, as Figure 8 shown.

[0058] The conical section 32 of the extrusion block 3 is beneficial to increasing the depth of the extrusion block 3 entering the sleeve 2, increasing the area generating the clamping force, and further increasing the clamping degree of the steel strand bundle between the extrusion block 3 and the sleeve 2, thereby further enhancing the stability of the connection between the steel strand bundle and the traction device. At the same time, by adjusting the inner diameter of the hose clamp 9, the clamping degree of the steel strand bundle can be further improved. The conical section 32 is also beneficial to quickly pushing the restraint ring 5 and the sleeve 2 to the extrusion block, improving the efficiency of the traction operation.

[0059] The traction operation is generally the same as that in Embodiment 1, except that before pushing the sleeve 2 to the extrusion block 3, first install the hose clamp 9 to cooperate with the extrusion block 3 to clamp the steel strand bundle. The specific installation method is to screw the worm 92, separate the head and tail of the strap 91, wind the strap 91 around the steel strand bundle at the extrusion block 3 and then connect the head and tail of the strap 91, and then screw the worm 92 to tighten the steel strand bundle. When disassembling, remove the hose clamp 10 in the reverse order of the installation steps. Compared with the disassembly method of hitting the edge of the restraint ring 5, the disassembly of the hose clamp 9 is more convenient, further improving the traction efficiency.

[0060] Embodiment 3

[0061] This embodiment is generally the same as Embodiment 1, except that when the on - site situation of the post - tensioned prestressed project is simple, steel wires can be used as the restraint ring 5.

[0062] The traction operation is generally the same as that in Embodiment 1, except that the steel wires are directly used to cooperate with the extrusion block 3 to clamp the steel strand bundle. When disassembling, after the sleeve 2 is disassembled, the steel wires can be directly cut off.

[0063] Example 4

[0064] This example is generally the same as Example 3, except that the steel strand 6 is intercepted on-site as the traction line 1, and the extrusion anchor is used as the extrusion block 3 and the traction end 4. It is particularly suitable for the situation where corresponding tool elements are lacking at the post-tensioned prestressed project site.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A traction device for a strand bundle, comprising a sleeve (2) and a traction wire (1), the traction wire (1) passing through the sleeve (2), one end of the traction wire (1) being provided with a traction end (4), characterized in that, The other end of the traction wire (1) is provided with an extrusion block (3). The extrusion block (3) is located within the steel strand bundle. A restraint ring (5) is sleeved on the steel strand bundle and the restraint ring (5) is located at the position of the extrusion block (3). The outer diameter of the steel strand bundle wrapping the extrusion block (3) is greater than the inner diameter of the restraint ring (5). The sleeve (2) is sleeved on the top end of the steel strand bundle and the sleeve (2) is located at the position of the extrusion block (3). The inner diameter of the sleeve (2) is less than the inner diameter of the restraint ring (5) and greater than the sum of the outer diameter of the traction wire (1) and twice the outer diameter of the steel strands (6) in the steel strand bundle.

2. The traction device for the steel strand bundle according to claim 1, characterized in that, The restraint ring (5) is a hose clamp (9). The hose clamp (9) includes a hoop band (91). One end of the hoop band (91) is provided with a nut (93). A worm (92) is arranged in the nut (93). The other end of the hoop band (91) passes through the through hole in the nut (93) and forms a worm connection with the worm (92).

3. The traction device for the steel strand bundle according to claim 1, characterized in that, The extrusion block (3) includes a cylindrical section (31) and a conical section (32). The conical section (32) is arranged at one end of the cylindrical section (31). The conical section (32) is adjacent to the sleeve (2).

4. The traction device for the steel strand bundle according to claim 1, characterized in that, One end of the sleeve (2) adjacent to the extrusion block (3) is provided with a reinforcing ring (23).

5. The traction device for the steel strand bundle according to claim 1, characterized in that, The sleeve (2) includes a cylindrical section (22) and a conical section (21). The conical section (21) is arranged at one end of the cylindrical section (22). The conical section (21) is adjacent to the traction end (4).

6. The traction device for the steel strand bundle according to claim 1, characterized in that, The extrusion block (3) is threadedly connected to the traction wire (1), and the traction end (4) is threadedly connected to the traction wire (1).

7. The traction device for the steel strand bundle according to claim 1, characterized in that, The material of the traction device is a steel product.

8. The traction device for the steel strand bundle according to claim 1, characterized in that, The number of steel strands (6) in the steel strand bundle is greater than or equal to 5.

9. A method for towing a steel strand bundle, characterized in that, Including the following steps: S1: After the traction wire (1) passes through the sleeve (2), a traction end (4) is installed at one end of the traction wire (1), and an extrusion block (3) is installed at the other end. S2: After the extrusion block (3) passes through the restraint ring (5), it is inserted into the steel strand bundle, and the restraint ring (5) is sleeved on the steel strand bundle. S3: The restraint ring (5) is pushed to the position of the extrusion block (3). The outer diameter of the steel strand bundle wrapping the extrusion block (3) is greater than the inner diameter of the restraint ring (5). The extrusion block (3) and the restraint ring (5) form a primary clamping of the steel strand bundle. S4: The sleeve (2) is sleeved on the top end of the steel strand bundle and pushed to the position of the extrusion block (3). The inner diameter of the sleeve (2) is less than the inner diameter of the restraint ring (5). The extrusion block (3) and the sleeve (2) form a secondary clamping of the steel strand bundle. S5: The traction end (4) is connected to the traction hook (8) of the traction device (7). S6: The traction device (7) is started to traction the steel strand bundle to move in the traction direction. S7: After moving to the designated position, the traction device is removed, and the traction work is completed.

10. The traction method of the steel strand bundle according to claim 9, characterized in that, The traction wire (1) is a steel strand (6), the extrusion block (3) is an extrusion anchor, the traction end (4) is an extrusion anchor, and the restraint ring (5) is a steel wire or an iron wire.

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