Steel strand penetrating device in corrugated pipe

Abstract

The utility model relates to the technical field of steel strand pulling, in particular to a steel strand pulling device in a corrugated pipe, which is characterized in that a clamp is arranged in a conical barrel structure, a core body is arranged in a cone structure, and the distance between the outer wall of the cone and the inner wall of the conical barrel is less than or equal to 2mm; meanwhile, a plurality of steel strand clamping assemblies are arranged between the inner wall of the conical barrel and the outer wall of the cone, the steel strand pulling device is formed by combining a traction head and a traction ring, after a steel strand needing to penetrate through a corrugated pipe is clamped through the steel strand clamping assemblies, the steel strand pulling device penetrates through the corrugated pipe, and the steel strand pulling device can penetrate through the corrugated pipe through the steel strand pulling device by utilizing the cylindrical structure of the core body. The clamp in the shape of the conical barrel is pulled out of the corrugated pipe, the whole strand pulling effect of the steel strand is achieved, and by means of the structure of the conical barrel and the cone, the top end of the conical barrel continuously slides towards the bottom end of the cone in the process that a traction machine or a winch pulls a traction head, so that the steel strand pulling effect is achieved. The steel strand clamping assembly can clamp the steel strand more firmly, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel strand bundle threading, in particular to a bundle threading device required for threading steel strands as a whole bundle through a corrugated pipe during the construction of prestressed structural steel strands, in particular to a steel strand bundle threading device in a corrugated pipe. Background Art

[0002] With the rapid development of prestressing technology in beam and / or slab structures, its construction technology has been nearly perfected. As a result, during the construction process of such projects, it is usually necessary to pass several strands of prestressed steel strands through a corrugated pipe. Prestressed steel strands are spirally wound with a center wire and several side wires. Therefore, when constructing multiple strands of prestressed steel strands through a corrugated pipe in the prior art, the method usually adopted is to bundle the prestressed steel strands through the corrugated pipe one by one. Because the prestressed steel strands are entangled with each other, they occupy the limited cross-sectional space of the corrugated pipe, resulting in the last few prestressed steel strands being unable to pass through, affecting the transmission of prestress. For example, the construction method of passing prestressed steel strands through a corrugated pipe disclosed in the background art of the prestressed steel strand threading device for bundling prestressed steel strands through a corrugated pipe with Patent No. 201020588579.5.

[0003] Therefore, the construction of concentrated bundled corrugated pipes of prestressed steel strands has been rapidly developed and studied. For example, the prestressed steel strand bundled corrugated pipe device with the above-mentioned patent number 201020588579.5 is intended to solve the defect of a single prestressed steel strand repeatedly passing through the corrugated pipe in the prior art. A tractor is combined with a bundler, and a plurality of through holes are provided on the bundler. The through hole diameter is larger than the steel core diameter of the prestressed steel strand to pass through the corrugated pipe, and the radial dimensions of the tractor and the bundler are both smaller than the inner diameter of the corrugated pipe. During construction, a part of the outer steel wire of the prestressed steel strand is removed to expose the central steel wire, and pass through the corresponding through hole. The part passing through the through hole is flattened and anchored, and then the bundler is screwed into the tractor and tightened. After the tractor and the bundler are integrated, the winch is used to pass through the corrugated pipe to achieve the concentrated bundle function.

[0004] Another example is the construction method for threading a prestressed structural steel strand with patent number 201010583097.5, which discloses processing the traction end of each steel strand so that one of the steel wires is exposed by a certain length compared to the other steel wires. All the steel strands in the bundle are bundled together, and the exposed steel wire of each steel strand is fixed to a steel strand anchor. The front end of the threading anchor is connected to the traction wire rope of the traction device, and the rear end is connected to the exposed steel wire of the steel strand. The traction wire rope drives the steel strand bundle to move within the corrugated tube through the threading anchor. The threading anchor includes a body, which is formed by connecting an anchor plate and a hollow anchor head. The anchor plate is provided with several threading holes, and the front end of the anchor head is provided with a traction wire rope hole. A rod insertion hole is correspondingly provided between the anchor plate and the anchor head, and a rod is provided in the insertion hole. This avoids the thermal stress of the steel strand bundle caused by end welding, thereby improving the construction efficiency of the entire bundle threading.

[0005] It can be seen that the prior art discloses the use of a bundling device to bundle the prestressed steel strands that need to pass through the corrugated pipe, and then connects the bundling device to a tractor to form a bundle-through device as a whole. Then, through the action of a tractor or a winch, the bundle-through device is pulled as a whole to achieve the bundled prestressed steel strands passing through the corrugated pipe as a whole, thereby avoiding the corresponding defects caused by the passing of a single steel strand. However, the bundle-through device in the prior art is to separate the bundling device from the traction device. During the construction process, the bundling device needs to be connected to the traction device, such as by screwing in and tightening or inserting a rod. This causes the entire bundle of prestressed steel strands to easily fall off when passing through the corrugated pipe, affecting construction efficiency.

[0006] In view of this, the researchers combined their long-term construction practice experience to improve the existing bundle threading device structure for steel strands passing through corrugated pipes, providing a new structure for prestressed steel strands passing through corrugated pipes and bundling them. Utility Model Content

[0007] In order to solve the above technical problems existing in the prior art, the present invention provides a steel strand bundle threading device in a corrugated pipe.

[0008] This is achieved specifically through the following technical solutions:

[0009] The steel strand threading device in the corrugated pipe includes a traction core and a clamp, the traction core includes a traction head and a core body, the core body is a cone, the top diameter of the cone is less than the bottom diameter of the cone, and the top of the cone is integrally connected with the traction head; the clamp is a conical cylinder, the cone can be sleeved on the cone, and the inner wall of the cone can be spaced ≤2mm from the outer wall of the cone; the traction head can pass through the top of the cone; a number of steel strand clamping components are provided between the inner wall of the cone and the outer wall of the cone; the top of the traction head is provided with a traction ring.

[0010] The clamp is set to a conical cylinder structure, the core is set to a conical structure, the distance between the outer wall of the cone and the inner wall of the cone is set to ≤2mm, and at the same time, a number of steel strand clamping assemblies are set between the inner wall of the cone and the outer wall of the cone. The traction head and the traction ring are combined to form a steel strand bundle threading device. After the steel strand that needs to pass through the corrugated pipe is clamped by the steel strand clamping assembly, the conical cylinder clamp is pulled out of the corrugated pipe by utilizing the conical structure of the core, so as to achieve the effect of threading the entire bundle of steel strands. In addition, by utilizing the structure of the cone and the cone, when the traction machine or winch pulls the traction head, the top end of the cone continuously forms a sliding tendency toward the bottom end of the cone, thereby enhancing the fit tightness, making the steel strand clamping assembly clamp the steel strand more firmly, and improving construction efficiency.

[0011] In order to improve the connection strength between the traction ring and the traction head, preferably, the traction ring and the traction head are formed integrally.

[0012] In order to simplify the installation of the steel strand clamping and ensure the stability of the installation, preferably, the steel strand clamping assembly includes a wire groove a provided on the outer wall of the cone and a wire groove b provided on the inner wall of the conical cylinder, and the wire groove a and the wire groove b can match each other.

[0013] More preferably, the curvature radius of the wire groove a is ≥ the curvature radius of the middle wire, and the chord length of the wire groove a is < the diameter of the middle wire; the curvature radius of the wire groove b is ≥ the curvature radius of the middle wire, and the chord length of the wire groove b is < the diameter of the middle wire.

[0014] In order to firmly clamp the steel wire inserted into the steel strand clamping assembly, preferably, a plurality of core teeth are provided in the wire groove a; and / or a plurality of matching teeth are provided in the wire groove b.

[0015] More preferably, the mating teeth and the core inner teeth can be in an annular or spiral structure on the inner wall of the conical cylinder and the outer wall of the cone.

[0016] In order to ensure that the entire bundle of steel strands can better fill the internal space of the corrugated pipe after passing through the corrugated pipe and avoid large gaps in the corrugated pipe, it is preferred that the steel strands are installed in the steel strand clamping assembly to form bundled steel strands, and the number of steel strand clamping assemblies arranged between the inner wall of the conical cylinder and the outer wall of the cone can meet the requirement that the absolute value of the difference between the outer diameter of the cross section of the bundled steel strands and the outer diameter of the bottom surface of the conical cylinder is less than 0.2 mm, and the outer diameter of the cross section of the bundled steel strands is ≥ the outer diameter of the bottom surface of the conical cylinder.

[0017] More preferably, the outer diameter of the cross section of the bundled steel strands is equal to the outer diameter of the bottom surface of the conical cylinder.

[0018] Preferably, the axial length of the wire groove a is ≤ the length from the top to the bottom along the outer wall of the cone, and the wire groove a is extended from the bottom end to the top end along the outer wall of the cone.

[0019] In order to ensure that the wire groove b on the conical cylinder always interacts with the wire groove a on the cone to clamp the steel strand and improve the clamping stability, it is preferred that the axial length of the wire groove b is equal to the length from the top to the bottom along the inner wall of the conical cylinder.

[0020] Preferably, the axial length of the wire groove a is ≥10 cm; and / or the axial length of the wire groove b is ≥10 cm.

[0021] Preferably, the axial length of the conical cylinder is ≤ the axial length of the cone.

[0022] Preferably, the wire groove b and the wire groove a are matched with each other to form a circular hole.

[0023] Compared with the prior art, the technical effects created by the present invention are embodied in:

[0024] The invention has a simple structure and can realize the threading of the entire bundle of prestressed structural steel strands through the corrugated pipe, avoiding the defects of difficulty in threading the last few steel strands due to the threading of single steel strands one by one, high construction intensity and low efficiency. At the same time, it can avoid the defect of large gaps formed in the corrugated pipe due to the entanglement and extrusion of the steel strands, resulting in uneven transmission of the tension force, which helps to improve the prestress affected by the defects of the prestressed structural steel strands passing through the corrugated pipe and improve construction efficiency.

[0025] The invention utilizes a clamp with a conical cylinder structure to cooperate with a core with a conical structure, so that the core and the traction head are formed as one piece. A traction ring is provided on the traction head. When the traction head is pulled through the corrugated pipe by the traction ring, the clamp with the conical cylinder structure forms a sliding tendency toward the bottom of the conical core under the action of the friction force of the inner wall of the corrugated pipe and the friction force of the outer wall of the core, thereby promoting the clamp to firmly and more firmly clamp the steel strand. At the same time, under the action of the conical core structure, the clamp with the conical cylinder structure can be prevented from falling off the core, thereby improving stability and clamping strength, and helping to improve construction efficiency.

[0026] The invention has a simple structure and is easy to use, helps to improve the efficiency of steel strand bundle threading construction, and is easy to promote and implement industrially. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Create an overall structural diagram for this invention.

[0028] Figure 2 for Figure 1 Schematic diagram of the view structure shown by the arrow.

[0029] Figure 3 for Figure 2 Another structural diagram of an embodiment.

[0030] Figure 4 for Figure 1 Schematic diagram of the assembly structure.

[0031] Figure 5 Schematic diagram of the fixture cross-section structure.

[0032] Figure 6 Schematic diagram of the traction core structure.

[0033] Figure 7 This is a schematic diagram of the completed structure of a single steel strand.

[0034] Figure 8 The schematic diagram of another embodiment of the structure is shown in FIG. 1 , which is a schematic diagram of the structure of another embodiment of the processing of a single steel strand.

[0035] Figure 9 Coloring diagram of the structure of the traction core used in the production design drawing.

[0036] Figure 10 Schematic diagram of the colored structure of a single steel strand used for bundle threading.

[0037] 1- traction ring 2- traction head 3- clamp 4- core 5- steel strand clamping assembly 6- matching teeth 7- core inner teeth 8- wire groove a 9- side wire 10- middle wire 11- wire groove b.

[0038] 3.1 Inner wall of the fixture 4.1 Outer wall of the core 9.1 - Outer edge wire 9.2 - Inner edge wire. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further defined below in conjunction with the accompanying drawings and specific implementation methods, but the scope of protection required is not limited to the description.

[0040] like Figure 1 and Figure 2 and Figure 3 and Figure 4 and Figure 5 and Figure 6 As shown, in some embodiments, the steel strand threading device in the corrugated pipe includes a traction core and a clamp 3, the traction core includes a traction head 2 and a core body 4, the core body 4 is a cone, the top diameter of the cone is less than the bottom diameter of the cone, and the top of the cone is integrally connected with the traction head 2; the clamp 3 is a conical cylinder, the cone can be sleeved on the cone, and the inner wall of the cone can be spaced ≤2mm from the outer wall of the cone, for example: 0mm (such as Figure 2As shown, the inner wall 3.1 of the fixture and the outer wall 4.1 of the core are in a fitted state, with a spacing of 0 mm); for another example: Figure 3 As shown, the inner wall 3.1 of the clamp and the inner wall 4.1 of the core are in a separated state, 0mm<spacing<2mm, such as: 0.2mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 2mm, etc., the traction head 2 can pass through the top of the cone; a plurality of steel wire clamping assemblies 5 are provided between the inner wall of the cone and the outer wall of the cone; a traction ring 1 is provided at the top of the traction head 2.

[0041] The invention creates a steel strand bundle passing device in a corrugated pipe to pass the steel strand through the corrugated pipe as a whole. Figure 6 The structure shown is as follows: the side wire 9 is stripped off so that the middle wire 10 is exposed, and the stripped side wire 9 is cut off so that the middle wire 10 is exposed to a certain length compared to the side wire 9; the middle wire 10 is installed in each steel strand clamping assembly, and the traction head 2 is inserted from the bottom of the conical clamp 3 and passed out from the top of the clamp 3 (as shown in FIG. Figure 4 As shown), the conical clamp 3 is set on the core 4, clamping the middle wire 10 to complete the connection between the steel strand and the bundling device; or as Figure 7 As shown, the side wires 9 are layered and peeled off to form inner side wires 9.2 and outer side wires 9.1. At the same time, the inner side wires 9.2 are peeled off from the middle wires 10, so that the middle wires 10 are exposed to a certain length compared to the inner side wires 9.2. The middle wires 10 are respectively installed in each steel strand clamping assembly, and the traction head 2 is inserted from the bottom of the conical clamp 3 and is passed out from the top of the clamp 3 (as shown in FIG. Figure 4 As shown), the clamp 3 of the cone is placed on the core 4, the middle wire 10 is clamped, and the connection between the steel strand and the bundling device is completed; then the traction head 2 is placed at the inlet end of the corrugated pipe, the traction ring 1 is placed in the corrugated pipe, and the traction ring 1 is connected by a winch, so that the bundle-threading device passes through the corrugated pipe to complete the bundle-threading of the entire steel strand.

[0042] The core 4 of the present invention is a cone according to the following Figure 5 The cut section is trapezoidal, and the fixture 3 is a conical cylinder according to Figure 4 and Figure 6 The cross-section shown is trapezoidal.

[0043] like Figure 2 、 Figure 3 、 Figure 4 and Figure 5 、 Figure 6As shown, in some embodiments, the steel strand clamping assembly includes a wire groove a8 provided on the outer wall of the cone and a wire groove b11 provided on the inner wall of the cone, and the wire groove a8 and the wire groove b11 can match each other. The curvature radius of the wire groove a8 is greater than or equal to the curvature radius of the middle wire 10, and the chord length of the wire groove a8 is less than the diameter of the middle wire 10; the curvature radius of the wire groove b11 is greater than or equal to the curvature radius of the middle wire 10, and the chord length of the wire groove b11 is less than the diameter of the middle wire 10; when in use, as shown in FIG. Figure 7 or as Figure 8 As shown, the middle wire 10 is placed in the wire groove a8, and the traction head 2 is passed through the bottom of the clamp 3 and out of the top of the clamp 3, so that the clamp 3 of the conical cylinder is sleeved on the core body 4 of the cone, so that the middle wire 10 is clamped under the action of the wire groove b11 and the wire groove a8, and the connection between the steel strand and the bundling device is completed; the cone cylinder and the cone can form an interactive clamping force when passing through the subsequent corrugated tube and pulling, thereby enhancing the clamping of the steel strand. At the same time, it can prevent the cone cylinder from falling off the cone, thereby improving construction efficiency.

[0044] like Figure 4 、 Figure 5 and Figure 6 As shown, in some embodiments, a plurality of core teeth 7 are provided in the wire groove a8; and / or a plurality of matching teeth 6 are provided in the wire groove b11. The matching teeth 6 and the core teeth 7 can be in a circular or spiral structure on the inner wall of the cone and the outer wall of the cone. It can ensure that after the middle wire 10 is installed in the wire groove a8, the middle wire 10 is squeezed tightly under the action of the wire groove b11, thereby improving the strength and stability of the connection between the steel strand and the bundle threading device. The present invention creates the core teeth 7 and the matching teeth 6 as anti-slip grooves, the main purpose of which is to clamp and fix the middle wire 10 to prevent it from slipping.

[0045] like Figure 1-6 As shown, in certain embodiments, after the steel strands are installed in the steel strand clamping assembly, they are bundled steel strands, and the number of the steel strand clamping assemblies arranged between the inner wall of the conical cylinder and the outer wall of the cone can satisfy that the absolute value of the difference between the outer diameter of the cross section of the bundled steel strands and the outer diameter of the bottom surface of the conical cylinder is less than 0.2 mm, and the outer diameter of the cross section of the bundled steel strands is ≥ the outer diameter of the bottom surface of the conical cylinder. In this way, after the steel strands are bundled and pass through the corrugated pipe, it is possible to avoid the appearance of many gaps in the corrugated pipe, avoid excessive deformation of the corrugated pipe in the later stage and affect the prestress transfer effect, and at the same time reduce the difficulty of the bundle threading construction and improve the construction efficiency. In a more excellent embodiment, the outer diameter of the cross section of the bundled steel strands is equal to the outer diameter of the bottom surface of the conical cylinder.

[0046] like Figure 1-6As shown, in some embodiments, the axial length of the wire groove a8 is ≤ the length from the top to the bottom along the outer wall of the cone, and the wire groove a8 extends from the bottom end of the outer wall of the cone to the top end. The axial length of the wire groove b11 is equal to the length from the top to the bottom along the inner wall of the conical cylinder. This ensures that the wire groove b11 can always interact with the wire groove a8 to clamp the middle wire 10.

[0047] In some embodiments, the axial length of the wire groove a8 is ≥4 cm, for example, 4 cm, 6 cm, 8 cm, 10 cm, 15 cm, 20 cm, etc.; and / or the axial length of the wire groove b11 is ≥4 cm, for example, 4 cm, 6 cm, 8 cm, 10 cm, 15 cm, 20 cm, etc.

[0048] In some embodiments, the axial length of the conical cylinder is less than or equal to the axial length of the cone, so that the conical cylinder and the cone can always interact with each other, thereby improving the clamping effect of the centering wire 10 and enhancing stability.

[0049] In some embodiments, the wire groove b11 and the wire groove a8 mate with each other to form a circular hole. This allows the conical cylinder to slide toward the bottom end on the cone, thereby reducing the gap between the wire groove b11 and the wire groove a8 and improving the clamping of the centering wire 10, thereby enhancing the clamping effect.

[0050] Other matters not covered by the present invention may be accomplished by conventional means, referring to existing technologies or common knowledge known to those skilled in the art. In certain embodiments of the present invention, the core 4 is 6 cm tall from top to bottom, and the clamp 3 is 4 cm tall from top to bottom. When a winch or other traction device acts on the traction head 2, causing the core 4 and clamp 3 to pass through the corrugated tube together, the central axis of the core 4 can be substantially aligned with the central axis of the clamp 3. The ends of the core 4 can each protrude 1 cm from the clamp 3.

[0051] In certain embodiments, the outer diameter of the bottom end of the clamp 3 is smaller than the inner diameter of the corrugated pipe. In certain embodiments, the absolute difference between the outer diameter of the bottom end of the clamp 3 and the inner diameter of the corrugated pipe is 1-20 mm, for example, 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm. This facilitates the assembly of the clamp 3 and the core 4 into a bundle threading device, which can be threaded through the corrugated pipe as a whole. This invention is suitable for the construction of long cast-in-place prestressed beams or slabs in prefabrication yards or longitudinally long sites.

[0052] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A device for threading steel strands in a corrugated pipe, characterized in that: The invention comprises a traction core and a clamp (3), wherein the traction core comprises a traction head (2) and a core body (4), wherein the core body (4) is in the form of a cone, wherein the top diameter of the cone is smaller than the bottom diameter of the cone, and the top of the cone is integrally connected to the traction head (2); the clamp (3) is in the form of a conical cylinder, wherein the conical cylinder can be sleeved on the cone, and the inner wall of the conical cylinder can have a spacing of ≤2 mm from the outer wall of the cone; the traction head (2) can pass through the top of the conical cylinder; a plurality of steel strand clamping assemblies are arranged between the inner wall of the conical cylinder and the outer wall of the cone; a traction ring (1) is arranged at the top of the traction head (2); the steel strand comprises a side wire (9) and a middle wire (10), wherein the side wire (9) is wound around the middle wire (10) and wraps the middle wire (10).

2. The steel strand bundle threading device in a corrugated tube according to claim 1, characterized in that: The steel strand clamping assembly comprises a wire groove a (8) arranged on the outer wall of the cone and a wire groove b (11) arranged on the inner wall of the conical cylinder, and the wire groove a (8) and the wire groove b (11) can match each other; the curvature radius of the wire groove a (8) is ≥ the curvature radius of the middle wire (10), and the chord length of the wire groove a (8) is < the diameter of the middle wire (10); the curvature radius of the wire groove b (11) is ≥ the curvature radius of the middle wire (10), and the chord length of the wire groove b (11) is < the diameter of the middle wire (10).

3. The steel strand bundle threading device in a corrugated tube as claimed in claim 2, characterized in that: The wire groove a (8) is provided with a plurality of core internal teeth (7); and / or the wire groove b (11) is provided with a plurality of matching teeth (6).

4. The steel strand bundle threading device in a corrugated pipe as claimed in claim 3, characterized in that: The matching teeth (6) and the core inner teeth (7) can be in a circular ring or spiral structure on the inner wall of the conical cylinder and the outer wall of the cone.

5. The steel strand bundle threading device in a corrugated pipe as claimed in claim 1, characterized in that: After the steel strands are installed in the steel strand clamping assembly, they are bundled steel strands, and the number of the steel strand clamping assemblies arranged between the inner wall of the conical cylinder and the outer wall of the cone can satisfy that the absolute value of the difference between the outer diameter of the cross section of the bundled steel strands and the outer diameter of the bottom surface of the conical cylinder is less than 0.2mm, and the outer diameter of the cross section of the bundled steel strands is ≥ the outer diameter of the bottom surface of the conical cylinder.

6. The steel strand bundle threading device in a corrugated tube as claimed in claim 5, characterized in that: The outer diameter of the cross section of the bundled steel strands is equal to the outer diameter of the bottom surface of the conical cylinder.

7. The steel strand bundle threading device in a corrugated tube as claimed in claim 2, characterized in that: The axial length of the wire groove a (8) is ≤ the length from the top to the bottom along the outer wall of the cone, and the wire groove a (8) is extended from the bottom end to the top end of the outer wall of the cone; and / or the axial length of the wire groove a (8) is ≥10 cm; and / or the axial length of the wire groove b (11) is ≥10 cm.

8. The steel strand bundle threading device in a corrugated tube as claimed in claim 2, characterized in that: The axial length of the wire groove b (11) is equal to the length from the top to the bottom along the inner wall of the conical cylinder.

9. The steel strand bundle threading device in a corrugated pipe as claimed in claim 2, characterized in that: The wire groove b (11) and the wire groove a (8) are matched with each other to form a circular hole.

10. The steel strand bundle threading device in a corrugated pipe according to claim 1, characterized in that: The axial length of the conical cylinder is ≤ the axial length of the cone.

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