Threading device for retard-bonded prestressed steel strand
By designing a threading device for slow-bonding prestressed steel strands and utilizing a combination of a drag-reducing shell and a traction rope, the problem of slow-setting adhesive leakage caused by friction and collision of the sheath is solved, thereby improving the installation efficiency and quality of the steel strands and avoiding jamming.
Patent Information
- Application Number
- CN202422844588.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-21
AI Technical Summary
During the installation of slow-bonding prestressed steel strands, the outer sheaths and ends are easily damaged by friction and collision with the steel bars of the structural beams, causing leakage of the slow-setting adhesive and affecting the tensioning quality of the steel strands.
A threading device for slow-bonding prestressed steel strands is designed, comprising a drag-reducing shell, a clamp and a traction rope. The combination of the drag-reducing shell protective cover and the traction rope can prevent friction and collision between the shell and the steel bars, and the clamp is used to fix the traction rope and the steel strand to prevent them from falling off.
It effectively avoids leakage of retarding adhesive caused by friction and collision of sheath, reduces quality risks, improves the efficiency of steel strand threading, solves jamming problems, and reduces time and labor.
Smart Images
Figure CN223386990U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to a threading device for slow-bonding prestressed steel strands. Background Art
[0002] With the rapid development of urban construction, some buildings use a large number of large-span reinforced concrete prestressed structural beams in order to meet the applicable space requirements.
[0003] In current reinforced concrete beam construction, the most commonly used method is post-tensioned, slow-bond prestressed steel strand. This solves a series of problems associated with pre-reserved casing and post-tensioning grouting. However, during installation, the outer sheath and ends of the slow-bond prestressed steel strand are susceptible to friction and collision with the steel bars of the structural beam, causing damage and leakage of the slow-setting adhesive. This can lead to excessive leakage of the slow-bond prestressed steel strand, posing a quality risk that the strand cannot be tensioned.
[0004] Therefore, the question is how to solve the problem of retarding adhesive leakage caused by friction and collision between the outer sheath and end of a single retarding bond prestressed steel strand and the steel bars of the beam during installation. This can significantly reduce the risk of excessive retarding adhesive leakage within the retarding bond prestressed steel strand, which can lead to the strand being unable to be tensioned.
[0005] Therefore, there is an urgent need for a threading solution for slow-bonding prestressed steel strands that can reduce the collision and friction of slow-bonding prestressed steel strands when they pass through the steel bars and improve the threading and installation efficiency of the steel strands. Utility Model Content
[0006] The purpose of the present utility model is to provide a threading device for slow-bonding prestressed steel strands to solve at least one technical problem existing in the prior art.
[0007] The utility model protects a threading device for a slow-bonding prestressed steel strand, comprising a drag-reducing housing, a clamp and a traction rope; wherein,
[0008] The drag reduction shell includes a conical head and a cylindrical tail, and both ends are transparent; a circular hole is provided at the top of the conical head for the traction rope to pass through, one end of the cylindrical tail is connected to the conical bottom surface of the head, and the other end is used to pass the slow-bonding prestressed steel strand;
[0009] The traction rope is wound around the outer side of the threading end of the slow-bonding prestressed steel strand and is used to pull the slow-bonding prestressed steel strand;
[0010] The clamp is arranged on the outer periphery of the wound traction rope and the slow-bonding prestressed steel strand, and is placed together in the tail of the cylindrical body; the clamp is used to clamp the traction rope and the slow-bonding prestressed steel strand to prevent them from falling off during the traction process.
[0011] Furthermore, an optional structure includes that the drag reduction shell is formed by welding galvanized steel plates with a thickness greater than 1.6 mm.
[0012] Furthermore, an optional structure includes that the diameter of the circular hole is 1.5 times the diameter of the traction rope.
[0013] Furthermore, an optional structure includes that the bottom diameter of the conical head is consistent with the diameter of the tail of the cylinder.
[0014] Furthermore, an optional structure includes that the conical head, the cylindrical tail and the joints thereof are all welded by electric welding.
[0015] Furthermore, an optional structure includes that the traction rope is a steel wire rope.
[0016] Furthermore, an optional structure includes that at least two clamps are provided.
[0017] Furthermore, an optional structure includes that the clamp is a metal clamp.
[0018] Furthermore, an optional structure includes that the metal clamp is fixed by matching slots and buckles provided at both ends of the metal clamp.
[0019] As described above, the threading device of the slow-bonding prestressed steel strand of the present invention provides protection for the threading end of the slow-bonding prestressed steel strand by arranging a protective sleeve with a conical threading head at the threading end of the slow-bonding prestressed steel strand, which can effectively avoid the problem of leakage of the slow-setting adhesive caused by friction damage and collision between the outer sheath and the end of a single slow-bonding prestressed steel strand and the steel bars of the beam during threading and installation. It greatly reduces the quality risk of excessive leakage of the slow-setting adhesive in the slow-bonding prestressed steel strand, which causes the steel strand to be unable to be tensioned. It also solves the problem of damage to the steel strand jacket and leakage, as well as time and labor-consuming problems caused by the slow-bonding prestressed steel strand in large-span reinforced concrete prestressed beams in construction projects being blocked by the tied steel bars of the structural beam during threading, resulting in jamming. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] By referring to the following description in conjunction with the drawings and the contents of the claims, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand.
[0021] In the attached figure:
[0022] Figure 1 This is a structural schematic diagram of a threading device for a slow-bonding prestressed steel strand according to an embodiment of the present utility model;
[0023] Figure 2 It is a schematic cross-sectional structural diagram of the internal assembly of the threading device for slow-bonding prestressed steel strands according to an embodiment of the present utility model.
[0024] The reference numerals therein include: drag reduction shell 1, slow-bonding prestressed steel strand 2, clamp 3, traction rope 4, bolts and nuts 5. DETAILED DESCRIPTION
[0025] In the following description, for illustrative purposes, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.
[0026] It should be understood that terms such as "horizontal", "vertical", "up", "down", "top", "middle", "length", "inside", and "bottom" indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.
[0027] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0028] Example 1
[0029] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0030] Figure 1 、 Figure 2 The overall structure and cross-section of the threading device for slow-bonding prestressed steel strands are illustrated respectively. Specifically, Figure 1 The utility model is a schematic diagram of the overall structure of the threading device of the slow-bonding prestressed steel strand according to the embodiment of the present invention. Figure 2 It is a schematic cross-sectional structural diagram of the internal assembly of the threading device for slow-bonding prestressed steel strands according to an embodiment of the present utility model.
[0031] like Figure 1 、 Figure 2 As shown in the figure, the utility model protects a threading device for slow-bonding prestressed steel strands, which mainly includes a drag reduction shell 1, a clamp 3 and a traction rope 4; wherein,
[0032] The drag-reducing housing 1 comprises a conical head and a cylindrical tail, both ends of which are transparent. In other words, the drag-reducing housing 1 is a hollow structure, with a conical front end for traction and threading, and a cylindrical rear end to accommodate the slow-bonding prestressed steel strand 2 to be threaded. A circular hole is provided at the apex of the conical head for the passage of the traction rope 4. One end of the cylindrical tail is connected to the conical bottom surface of the head, and the other end is used to pass the slow-bonding prestressed steel strand 2.
[0033] The traction rope 4 is wrapped around the outside of the threading end of the slow-bonding prestressed steel strand 2 and is used to pull the slow-bonding prestressed steel strand. A clamp 3 is placed around the outer periphery of the wrapped traction rope 4 and slow-bonding prestressed steel strand 2 to secure the traction rope and slow-bonding prestressed steel strand. The clamp 3 secures the traction rope 4 and slow-bonding prestressed steel strand 2 together and then places them together within the cylindrical tail. The clamp 3 secures the traction rope 4 and slow-bonding prestressed steel strand 2 to prevent them from falling off during traction.
[0034] In a specific embodiment of the present invention, the drag-reducing housing 1 is made of galvanized steel sheet greater than 1.6 mm thick. The diameter of the circular hole at the top of the cone is generally set to approximately 1.5 times the diameter of the traction rope to facilitate the passage of the traction rope 4. The bottom diameter of the conical head is consistent with the diameter of the cylindrical tail. The conical head and the cylindrical tail, as well as their joints, are all welded using electric welding, ensuring a secure weld.
[0035] Of course, drag-reducing shells of other materials and thicknesses may also be used.
[0036] exist Figure 1 In the embodiment shown, the diameter of the circular hole at the top of the cone is 10 cm, the length of the conical head is 120 cm, and the length of the cylindrical tail is 160 cm.
[0037] The slow-bonding prestressed steel strand 2 can be an ordinary prestressed steel strand, and the specific specifications and models can be determined according to actual project needs.
[0038] The traction rope 4 can be a steel wire rope, and the clamp can be a metal clamp. To effectively secure the traction rope 4 and the slow-bonding prestressed steel strand 2, at least two clamps 3 are provided outside the wound traction rope 4 and slow-bonding prestressed steel strand 2, with more clamps evenly distributed around the wound traction rope 4 and slow-bonding prestressed steel strand 2. The clamps can be tightened with appropriate bolts and nuts 5 to prevent them from falling off during traction of the slow-bonding prestressed steel strand 2.
[0039] It should be noted that the fastening forms of the clamp may include, bolt connection: for example, the two ends of the clamp are designed to be plates with bolt holes, and the two ends of the clamp are fixed by bolts to fasten the slow-bonding prestressed steel strand wrapped by the traction rope. Clamp connection: for example, adjustable clamps or buckles are used, which can fix equipment of different sizes and provide a fast and stable connection. Specifically, as an example, the two ends of the clamp can be designed to be in the form of matching slots and buckles. Locking clamp: for example, a locking clamp is designed to fix the two ends of the clamp, and the traction rope and the slow-bonding prestressed steel strand are fixed by the clamping force.
[0040] In a specific embodiment, the threading device for the slow-bonding prestressed steel strand is used in the following steps:
[0041] Step 1: If Figure 1 As shown, the traction rope 4 is tightly wound in one direction outside the slow-bonding prestressed steel strand 2;
[0042] Step 2: If Figure 1 As shown, outside the wound traction rope 4 and the slow-bonding prestressed steel strand 2, at least two clamps 3 and suitable bolts and nuts 5 are tightened and fixed to prevent the slow-bonding prestressed steel strand from falling off during the traction process;
[0043] Step 3: If Figure 1 As shown, the assembly formed by the slow-bonding prestressed steel strand 2, the traction rope 4, the clamp 3 and the bolt and nut 5 is passed through the large hole at the cylindrical end of the drag reduction housing 1 and out of the small hole at the conical end to form the threading device of the above-mentioned slow-bonding prestressed steel strand.
[0044] To sum up, the threading device for the slow-bonding prestressed steel strand provided by the utility model uses a drag-reducing shell to set a protective cover at the threading end of the slow-bonding prestressed steel strand, which can not only protect the slow-bonding prestressed steel strand but also facilitate threading. It effectively avoids the problem of leakage of the slow-setting adhesive caused by friction and collision between the outer sheath and the end of the single slow-bonding prestressed steel strand and the steel bars of the beam during threading and installation, greatly reduces the quality risk of excessive leakage of the slow-setting adhesive in the slow-bonding prestressed steel strand, resulting in the inability to tension the steel strand. It also solves the problem of damage and leakage of the outer jacket of the slow-bonding prestressed steel strand and time-consuming and labor-intensive problems caused by the slow-bonding prestressed steel strand in the large-span reinforced concrete prestressed beam in construction projects being blocked by the tied steel bars of the structural beam during the threading process.
[0045] However, those skilled in the art will appreciate that various improvements can be made to the threading device for slow-bonding prestressed steel strands provided by the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the contents of the appended claims.
Claims
1. A threading device for slow-bonding prestressed steel strands, characterized in that: It includes a drag reduction shell, a clamp and a traction rope; wherein, The drag reduction shell includes a conical head and a cylindrical tail, and both ends are transparent; a circular hole is provided at the top of the conical head for the traction rope to pass through, one end of the cylindrical tail is connected to the conical bottom surface of the head, and the other end is used to pass the slow-bonding prestressed steel strand; The traction rope is wound around the outer side of the threading end of the slow-bonding prestressed steel strand and is used to pull the slow-bonding prestressed steel strand; The clamp is arranged on the outer periphery of the wound traction rope and the slow-bonding prestressed steel strand, and is placed together in the tail of the cylindrical body; the clamp is used to clamp the traction rope and the slow-bonding prestressed steel strand to prevent them from falling off during the traction process.
2. The threading device for slow-bonding prestressed steel strand according to claim 1, characterized in that: The drag reduction shell is formed by welding galvanized steel plates with a thickness greater than 1.6 mm.
3. The threading device for slow-bonding prestressed steel strand according to claim 2, characterized in that: The diameter of the circular hole is 1.5 times the diameter of the traction rope.
4. The threading device for slow-bonding prestressed steel strand according to claim 3, characterized in that: The bottom diameter of the conical head portion is consistent with the diameter of the cylindrical tail portion.
5. The threading device for slow-bonding prestressed steel strand according to claim 4, characterized in that: The conical head, the cylindrical tail and their joints are all welded by electric welding.
6. The threading device for slow-bonding prestressed steel strand according to claim 1, characterized in that: The traction rope is a steel wire rope.
7. The threading device for slow-bonding prestressed steel strand according to claim 1, characterized in that: At least two clamps are provided.
8. The threading device for slow-bonding prestressed steel strand according to claim 7, characterized in that: The clamp is a metal clamp.
9. The threading device for slow-bonding prestressed steel strand according to claim 8, characterized in that: The metal clamp is fixed by bolts and nuts.
10. The threading device for slow-bonding prestressed steel strand according to claim 8, characterized in that: The metal clamp is fixed by matching slots and buckles arranged at both ends of the metal clamp.