Prestressed steel strand threading and wall-hanging prevention mechanism

Abstract

The utility model relates to the field of bridge construction, concretely is a kind of pre-stressed steel strand cable threading wall-hanging prevention mechanism, including mounting seat and guide head;Several through holes are equipped on mounting seat, each through hole is used to pass through a bundle of steel strand, each through hole is correspondingly provided with clamping piece, and the steel strand passing through through hole is anchored by clamping piece;Guide head is conical structure, guide head length direction is set along steel strand length direction, and the larger end of guide head can be detachably connected mounting seat.The utility model can directly insert steel strand into through hole and be fixed by clamping piece, that is, steel strand and mounting seat can be quickly connected, then all steel strands connected to mounting seat are guided to pre-stressed cable threading by the guide head of conical structure, guide head wraps steel strand end, avoids the direct contact friction of steel strand end and corrugated pipe inner wall, avoids wall-hanging, realizes smooth and efficient cable threading of steel strand, and adapt to the construction demand of different specifications corrugated pipe and steel strand, reduce the probability of steel strand break or corrugated pipe damage.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction, and in particular to a prestressed steel strand cable threading anti-hanging mechanism. Background Technology

[0002] Prestressed technology is increasingly being used in bridge construction, with the threading of prestressed steel strands being a crucial step. Steel strands are typically composed of multiple high-strength steel wires twisted together and must pass through pre-drilled channels formed by corrugated pipes (or plastic pipes) embedded in the concrete structure. Due to potential issues such as uneven inner walls, weld slag residue, misaligned joints, or slight corrosion and insufficient lubrication on the surface of the corrugated pipes during processing, transportation, or installation, the steel strands are prone to "hanging" against the pipe wall during threading. This results in localized jamming of the steel strands, a sudden increase in friction, making threading difficult, slowing down the process, and even breaking the steel strands or damaging the corrugated pipe, severely impacting construction efficiency and structural safety. Utility Model Content

[0003] The purpose of this utility model is to provide a prestressed steel strand anti-snagging mechanism for threading prestressed steel strands when they pass through pre-reserved channels such as corrugated pipes. This mechanism addresses the problem that in the existing technology, when prestressed steel strands pass through pre-reserved channels, the steel strands are easily caught on the inner wall of the channels, causing local jamming of the steel strands, a sudden increase in friction, resulting in difficulty in threading, a decrease in speed, or even breakage of the steel strands or damage to the corrugated pipes.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A prestressed steel strand anti-snagging mechanism includes a mounting base and a guide head. The mounting base has several through holes, each for passing through a bundle of steel strands. Each through hole is provided with a corresponding clamp to anchor the steel strand passing through the through hole. The guide head has a conical structure, and its length direction is along the length direction of the steel strand. The larger end of the guide head is detachably connected to the mounting base.

[0005] The prestressed steel strand threading anti-snagging mechanism of this utility model allows the steel strand to be directly inserted into the through hole and fixed by the clamp, thus quickly connecting the steel strand to the mounting base. Then, the conical guide head guides all the steel strands connected to the mounting base for prestressed threading. The guide head wraps around the end of the steel strand, preventing direct contact and friction between the end of the steel strand and the inner wall of the corrugated pipe, thus preventing snagging. This achieves smooth and efficient threading of the steel strand and adapts to the construction needs of corrugated pipes and steel strands of different specifications, reducing the probability of steel strand breakage or corrugated pipe damage. This anti-snagging mechanism has a simple structure, is easy to use, and has good performance.

[0006] As a preferred embodiment of this invention, the smaller end of the guide head is connected to a pull ring.

[0007] As a preferred technical solution of this utility model, the guide head is a shell structure.

[0008] As a preferred technical solution of this utility model, the generatrix of the guide head is a smooth curve.

[0009] As a further preferred technical solution of this utility model, the busbar of the guide head is similar to the waistline of a bowling pin.

[0010] As a preferred technical solution of this utility model, the mounting base has a cylindrical structure, the side wall of the mounting base is provided with external threads, the larger end of the guide head is provided with internal threads, and the guide head is threadedly connected to the mounting base.

[0011] As a preferred technical solution of this utility model, each of the through holes is provided with a groove on the side near one end of the guide head, the groove is connected to the through hole, and the clamping piece is disposed in the groove.

[0012] As a further preferred technical solution of this utility model, a rotating shaft is provided in the groove, the clamping piece is rotatably mounted on the rotating shaft, and the clamping piece is provided with locking teeth, which are arranged along a spiral line, with the side of the spiral line with a smaller radius away from the guide head.

[0013] As a further preferred technical solution of this utility model, a torsion spring is connected between the clamp and the rotating shaft.

[0014] As a preferred technical solution of this utility model, both the mounting base and the guide head are made of metal.

[0015] As a preferred embodiment of this invention, the number of through holes is 7 to 22.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: This utility model discloses a prestressed steel strand threading anti-snagging mechanism, which allows the steel strand to be directly inserted into the through hole and fixed by the clamp, thus quickly connecting the steel strand to the mounting base. Then, a tapered guide head guides all the steel strands connected to the mounting base for prestressed threading. The guide head wraps around the end of the steel strand, preventing direct contact and friction between the end of the steel strand and the inner wall of the corrugated pipe, thus preventing snagging. This achieves smooth and efficient threading of the steel strand and adapts to the construction needs of corrugated pipes and steel strands of different specifications, reducing the probability of steel strand breakage or corrugated pipe damage. This anti-snagging mechanism has a simple structure, is easy to use, and has good performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the prestressed steel strand threading anti-hanging mechanism. Figure 2 This is a schematic diagram of the mounting base. Figure 3 for Figure 2 Schematic diagram of the AA section; Figure 4 This is a schematic diagram showing the contact between the steel strand and the clamping plate. Figure 5 This is a schematic diagram showing the rotation of the steel strand driven clamps. Figure 6 This is a schematic diagram of the steel strand after it has been anchored by the clamps.

[0018] Marked in the image: 01-Steel strand; 1-Mounting base, 11-Through hole, 12-Groove, 13-Clamping piece, 14-Spindle; 2-Guide head; 3-Pull ring. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0022] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0023] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0024] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0025] In related technologies, when prestressed steel strands in bridges pass through pre-reserved ducts such as corrugated pipes, the strands are prone to snagging on the inner wall of the ducts. This is because: 1. The prestressed steel strands have angles and are not straight and smooth, making it difficult to thread them; 2. The prestressed ducts have local bends or misaligned joints, which can cause jamming during threading, making it difficult to thread; 3. The prestressed steel strands are composed of multiple strands, and the frictional resistance between the ends and the ducts is too high during threading, making it difficult to thread. This results in local jamming of the steel strands, a sudden increase in friction, leading to difficulty in threading, a decrease in speed, and even breakage of the steel strands or damage to the corrugated pipes. Therefore, the technical solution of this application was developed. The following is a detailed explanation... Figures 1 to 6 To elaborate.

[0026] Example 1 like Figures 1 to 6 As shown, the prestressed steel strand anti-snagging mechanism of this utility model includes a mounting base 1, a guide head 2, and a pull ring 3.

[0027] like Figure 1 As shown, the mounting base 1 has a cylindrical structure, the guide head 2 has a conical structure, the smaller end of the guide head 2 is connected to a pull ring 3, and the larger end of the guide head 2 is detachably connected to the mounting base 1.

[0028] In some optional embodiments, both the mounting base 1 and the guide head 2 are made of metal, wherein the guide head 2 can be a shell structure; the generatrix of the guide head 2 is a smooth curve, for example, the generatrix of the guide head 2 can be similar to the waistline of a bowling pin, or similar to the outer contour of a spindle, or the guide head 2 can directly adopt a common frustum structure.

[0029] In one optional embodiment, the side wall of the mounting base 1 is provided with external threads, and the larger end of the guide head 2 is provided with internal threads. The guide head 2 is threadedly connected to the mounting base 1, so that the mounting base 1 and the guide head 2 are connected.

[0030] In one optional embodiment, the side wall of the mounting base 1 is provided with a first pin hole, and the larger end of the guide head 2 is provided with a second pin hole. The larger end of the guide head 2 is sleeved on the side wall of the mounting base 1. The first pin hole and the second pin hole are aligned, and a pin is inserted to connect the mounting base 1 and the guide head 2. Alternatively, the first pin hole can be replaced with a screw hole, and the pin can be replaced with a screw, which can also achieve the connection between the mounting base 1 and the guide head 2.

[0031] like Figure 2 As shown, the mounting base 1 has several through holes 11, each through hole 11 for a bundle of steel strands 01 to pass through, and each through hole 11 is provided with a corresponding clamp 13, which anchors the steel strands 01 passing through the through hole 11; as shown Figure 1 As shown, the guide head 2 is arranged along the length direction of the steel strand 01.

[0032] In some optional embodiments, the number of through holes 11 is 7 to 22, for example in this embodiment. Figure 2 An example is given of a mounting base 1 having 19 through holes 11.

[0033] In one alternative implementation, such as Figure 2As shown, each of the through holes 11 has a groove 12 on its side near one end of the guide head 2. The groove 12 communicates with the through hole 11, and the clamping piece 13 is disposed within the groove 12; Figure 3 As shown, a rotating shaft 14 is provided in the groove 12, and the clamping piece 13 is rotatably mounted on the rotating shaft 14. The clamping piece 13 is provided with locking teeth, which are arranged along a spiral line. The side with the smaller radius of the spiral line is away from the guide head 2. A torsion spring is connected between the clamping piece 13 and the rotating shaft 14.

[0034] In one alternative implementation, such as Figure 2 As shown, each through hole 11 is provided with a pair of symmetrically arranged grooves 12, that is, each through hole 11 is provided with a pair of symmetrically arranged clamps 13, which increases the anchoring force and reduces the risk of the steel strand 01 detaching from the mounting base 1.

[0035] When using: Step 1, such as Figure 3 As shown, a bundle of steel strands 01 can be directly threaded into one of the through holes 11 without any processing. Step Two, as follows Figure 4 As shown, the end of the steel strand 01 contacts the locking teeth on the clamp 13 that penetrate the through hole 11, driving the clamp 13 to rotate around the rotating shaft 14. At this time, the torsion spring stores force, and the locking teeth on the side with the larger helical radius that penetrates the through hole 11 rotate away from the through hole 11, while the locking teeth on the side with the smaller helical radius rotate to contact the surface of the steel strand 01. Step 3, as follows Figure 5 As shown, when the steel strand 01 is pulled in the opposite direction, the tooth on the side with the smaller radius of the spiral wire contacts the surface of the steel strand 01. The movement of the steel strand 01 will drive the clamp 13 to rotate in the opposite direction. At the same time, the elastic force of the torsion spring will also force the clamp 13 to rotate in the opposite direction. Step 4, as follows Figure 6 As shown, the teeth on the side with the larger radius of the spiral gradually rotate and lock onto the surface of the steel strand 01, thus anchoring the steel strand 01. Step 5, as follows Figure 1 As shown, after all the steel strands 01 are connected to the mounting base 1, the mounting base 1 and the guide head 2 are connected; Step 6: After passing the winch traction rope through the corrugated pipe, connect it to the pull ring 3. Pull the prestressed steel strand threading anti-snagging mechanism by the winch to smoothly thread the steel strand 01. The steel strand 01 is less likely to get stuck on the wall during the threading process. Step 7: After the steel strand 01 passes through the corrugated pipe, the steel strand 01 near the mounting base 1 is cut off by a cutting machine, the connection between the mounting base 1 and the guide head 2 is released, and the broken steel strand 01 remnant rope stuck in the mounting base 1 is pushed forward, driving the clamp 13 to rotate around the rotating shaft 14. The clamping teeth on the side with the larger radius of the spiral rotate away from the surface of the steel strand 01 remnant rope, the steel strand 01 remnant rope is released from anchoring, thereby pushing it out of the mounting base 1, and the through hole 11 is reopened so that the mounting base 1 can be reused.

[0036] As can be seen from the above steps, the torsion spring is not a necessary component for anchoring the steel strand 01 to the mounting base 1. Even without the torsion spring, the locking teeth on the side with the larger radius of the spiral can gradually rotate and lock onto the surface of the steel strand 01. The forced rotation of the torsion spring only shortens the time for the locking teeth to anchor the steel strand 01 and the reverse pulling distance of the steel strand 01. Therefore, the torsion spring can be selected and used according to actual needs.

[0037] The prestressed steel strand threading anti-snagging mechanism of this utility model allows the steel strand 01 to be directly inserted into the through hole 11 and fixed by the clamp 13, thus quickly connecting the steel strand 01 to the mounting base 1. Then, the guide head 2 with a conical structure guides all the steel strands 01 connected to the mounting base 1 to be threaded together for prestressing. The guide head 2 wraps around the end of the steel strand 01 to avoid direct contact and friction between the end of the steel strand 01 and the inner wall of the corrugated pipe, thus preventing snagging and achieving smooth and efficient threading of the steel strand 01. It also adapts to the construction needs of corrugated pipes and steel strands 01 of different specifications, reducing the probability of steel strand 01 breakage or corrugated pipe damage. This anti-snagging mechanism has a simple structure, is easy to use, and has good effect.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pre-stressed steel strand threading anti-wall-hanging mechanism, characterized in that, include: The mounting base (1) is provided with a plurality of through holes (11), each of the through holes (11) is used to pass through a bundle of steel strands (01), and each of the through holes (11) is provided with a corresponding clamp (13), the clamp (13) anchoring the steel strands (01) passing through the through holes (11); The guide head (2) has a tapered structure. The length direction of the guide head (2) is set along the length direction of the steel strand (01). The larger end of the guide head (2) can be detachably connected to the mounting base (1).

2. The prestressing steel strand threading anti-wall-hanging mechanism according to claim 1, characterized in that, The smaller end of the guide head (2) is connected to a pull ring (3).

3. The prestressing steel strand wall-hanging prevention mechanism as claimed in claim 1, wherein, The guide head (2) is a shell structure.

4. The prestressing steel strand wall-hugging mechanism of claim 1, wherein The generatrix of the guide head (2) is a smooth curve.

5. The prestressed steel strand anti-snagging mechanism according to claim 1, characterized in that, The mounting base (1) has a cylindrical structure, and the side wall of the mounting base (1) is provided with external threads. The larger end of the guide head (2) is provided with internal threads, and the guide head (2) is threadedly connected to the mounting base (1).

6. The prestressed steel strand anti-snagging mechanism according to claim 1, characterized in that, Each of the through holes (11) has a groove (12) on the side near one end of the guide head (2), the groove (12) is connected to the through hole (11), and the clip (13) is disposed in the groove (12).

7. The prestressed steel strand anti-snagging mechanism according to claim 6, characterized in that, The groove (12) is provided with a rotating shaft (14), and the clamping piece (13) is rotatably mounted on the rotating shaft (14). The clamping piece (13) is provided with locking teeth, which are arranged along a spiral line. The side with the smaller radius of the spiral line is away from the guide head (2).

8. The prestressed steel strand anti-snagging mechanism according to claim 7, characterized in that, A torsion spring is connected between the clamp (13) and the rotating shaft (14).

9. The prestressed steel strand anti-snagging mechanism according to claim 1, characterized in that, Both the mounting base (1) and the guide head (2) are made of metal.

10. The prestressed steel strand anti-snagging mechanism according to any one of claims 1-9, characterized in that, The number of through holes (11) is 7 to 22.

Images