Anti-rotation device for HDPE pipe of stay cable

Abstract

The utility model discloses a stay cable HDPE (High-Density Polyethylene) pipe anti-rotation device which comprises two clamping pieces, and the two clamping pieces are respectively used for clamping and fixing HDPE protective sleeves of two stay cables; the two ends of the connecting arm are connected with the two clamping pieces respectively, the connecting arm is further provided with at least one hinge portion, and the hinge portion enables the connecting arm to adjust the relative distance between the two clamping pieces. The device can be used for installing the stay cable of a bridge under construction or a constructed bridge, the stress of the bridge is not changed, the structure is simple, the cost is low, and the installation is simple and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of cable-stayed bridges, in particular to an anti-rotation device for a HDPE pipe of a cable stay. Background Art

[0002] For example, the patent number "CN215210538U" discloses an anti-rotation cable HDPE jacket pipe connection structure, which is a common anti-rotation method currently: an anti-rotation unit is provided at the bottom and top of the HDPE jacket pipe of the cable to prevent the entire HDPE jacket pipe from rotating. The bottom end of the HDPE jacket pipe is threadedly connected to one end of the waterproof cover, and the other end of the waterproof cover is fixedly connected to the embedded pipe; the upper end of the HDPE jacket pipe is arranged in the tower end connecting pipe, and an anti-rotation unit is provided at the top. The anti-rotation unit includes a plurality of anti-rotation clamps, which are arranged circumferentially along the cable, and a card slot is provided on the anti-rotation clamp, and the plurality of card slots form an annular groove, and the HDPE end extends into the annular groove. The inner cavity of the anti-rotation clamp is provided with an inlay strip, and the inlay strip is inlaid with the cable, and the anti-rotation clamp and the HDPE jacket pipe are respectively provided with a plurality of connection holes in the circumferential direction.

[0003] The disadvantages of this process are: 1. It can only be used for newly built cable-stayed bridges and cannot be applied to completed cable-stayed bridges; 2. For long cable-stayed cables, only the two ends of the HDPE sheath pipe are locked, which is not conducive to eliminating local stress of the HDPE sheath pipe and easily causes local deformation of the HDPE sheath pipe, thus failing to achieve the anti-rotation effect; 3. The anti-rotation unit has a complex structure and requires high installation precision, and is prone to failure under long-term vibration of the bridge.

[0004] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Utility Model Content

[0005] In response to the above-mentioned existing defects, the purpose of the utility model is to provide an anti-rotation device for HDPE pipes of inclined cables, which can be installed and used on inclined cables of bridges under construction or already built without changing the stress of the bridge. It has a simple structure, low cost, and is easy and efficient to install.

[0006] The technical solution of the utility model is as follows:

[0007] A device for preventing rotation of an HDPE pipe of a stay cable comprises: two clamping members, each used to clamp and fix the HDPE sheath pipes of the two stay cables; and a connecting arm, each end of which is connected to the two clamping members. The connecting arm is further configured to have at least one hinged portion, which enables the connecting arm to adjust the relative distance between the two clamping members.

[0008] Specifically, the connecting arm includes two flat steels, the connected ends of the two flat steels are configured as fork ears and convex holes that are plugged into each other, and are rotatably connected by a first anchor nail to form the hinged portion.

[0009] Specifically, an arc-shaped double-sided baffle seat is provided at the hinge part, and an arc-shaped hole is provided on the arc-shaped double-sided baffle seat; the two flat steels are clamped in the arc-shaped double-sided baffle seat, one of the flat steels is fixed to the arc-shaped double-sided baffle seat, and the other flat steel is provided with a second anchor nail near the fork ear, and the second anchor nail is passed through the arc-shaped hole.

[0010] Specifically, the clamping member includes two semicircular hoops, one end of which is connected by bolts, and the other end is connected to the end of the flat steel by bolts. A rubber pad is also provided inside the two semicircular hoops.

[0011] Beneficial effects of the utility model:

[0012] 1. The anti-rotation device added in this solution consists of a clamp, rubber pads, high-strength bolts, flat steel, rivets, and arc-shaped baffles. The anti-rotation device is installed on the upper and lower adjacent HDPE sheath pipes of the inclined cables and connected and fixed to limit the rotation of the HDPE sheath pipes.

[0013] 2. The curved baffles in this scheme significantly enhance the transverse shear resistance of the anti-rotation structure. The two flat steel bars and the clamp-to-flat steel bars are all connected using hinged connections, eliminating the stress caused by unequal elongation of the two HDPE pipes of the different lengths of the cable-stayed cables due to temperature changes. This also eliminates the displacement effects caused by the different vibration frequencies of the two HDPE pipes of the cable-stayed cables during bridge operation.

[0014] 3. This solution can be installed and used on the cable-stayed bridges under construction or already built, without changing the bridge's load-bearing structure;

[0015] 4. The anti-rotation device of this solution is connected by high-strength bolts and rivets, which has a simple structure, low cost, and simple and efficient installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation of the HDPE pipe anti-rotation device for the inclined cable of the utility model.

[0017] Figure 2 It is a side view of the utility model of the anti-rotation device of the inclined cable HDPE pipe.

[0018] Figure 3 This is a top view of the HDPE pipe anti-rotation device for the inclined cable of the utility model.

[0019] Figure 4 This is a schematic diagram of the clamping member of the present utility model.

[0020] Figure 5 This is a schematic diagram of the arc-shaped baffle of the utility model.

[0021] In the figure: 1-bolt, 2-clamp, 3-rubber pad, 4-flat steel, 5-first anchor, 6-second anchor, 7-arc-shaped double-sided baffle seat, 8-HDPE sheath pipe, 9-anti-rotation device. DETAILED DESCRIPTION

[0022] To explain the technical content, objectives, and effects of the present invention in detail, the following embodiments are described in conjunction with the accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating orientation or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the embodiments and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0023] like Figure 1-3 As shown, according to a specific implementation of this scheme, an anti-rotation device for a cable-stayed HDPE pipe is arranged between two adjacent parallel cables of a cable-stayed bridge. The device includes two clamping members and a connecting arm connecting the two clamping members.

[0024] The two clamping parts are used to clamp and fix the HDPE sheath pipes 8 of the two inclined cables respectively. The two ends of the connecting arm are respectively connected to the two clamping parts. The connecting arm is also provided with at least one hinged part, which enables the connecting arm to adjust the relative distance between the two clamping parts.

[0025] The working principle of this embodiment is:

[0026] The rotation of the HDPE jacket tube 8 may cause relative displacement between the jacket tube and the cable, thereby affecting the mechanical properties of the cable or causing damage to the jacket tube. In this embodiment, the clamping member is first used to firmly grasp the HDPE jacket tube 8 to prevent it from rotating around its own axis; the connecting arm connects the two clamping members, and the hinged portion allows the length or angle of the connecting arm to be adjusted according to the actual relative position of the two inclined cables, thereby adapting to the distance between the inclined cables in different bridge structures, ensuring that the anti-rotation device 9 can be flexibly adjusted during installation without generating excessive installation stress, and preventing stress concentration or device damage caused by installation errors or inconsistent distances between inclined cables. When the cable is subjected to wind loads, vibrations or other external forces and may have a slight tendency to rotate, the device transmits the rotational force of the cable to the connecting arm through the clamping member, and the connecting arm then disperses this force to the adjacent cables, thereby achieving mutual restraint and preventing the HDPE jacket tube 8 from rotating significantly.

[0027] In summary, this embodiment prevents the HDPE sheath tube 8 (polyethylene material) wrapped on the inclined cable from rotating when subjected to force or the external environment changes. It can be installed and used on the inclined cable of a bridge under construction or already built without dismantling the internal structure of the cable, and therefore does not change the load-bearing structure of the bridge.

[0028] As the preferred technical solution of this embodiment, refer to Figure 5 As shown, the connecting arm comprises two flat steel bars 4, the connected ends of which are provided with interlocking fork ears and convex holes, and are rotatably connected to form a hinged portion via a first anchor 5. An arcuate double-sided baffle seat 7 is also provided at the hinged portion, with an arcuate hole provided in the arcuate double-sided baffle seat 7. The two flat steel bars 4 are clamped in the arcuate double-sided baffle seat 7, with one flat steel bar 4 fixed to the arcuate double-sided baffle seat 7, and the other flat steel bar 4 is provided with a second anchor 6 near the fork ear, which is inserted through the arcuate hole.

[0029] The curved double-sided baffle seat 7 and the curved hole design extend the device's adjustment range, accommodating a wider range of cable-stayed structures at varying distances and angles. In practical applications, cables may be affected by factors such as wind loads, temperature fluctuations, or traffic loads, resulting in slight displacements or vibrations. The curved double-sided baffle seat 7 and the curved hole design allow the structure to buffer and absorb these external forces within a certain range, preventing direct transmission to the cable or sheath, reducing fatigue or damage caused by external forces. The combination of the double-sided baffle seat and anchors also enhances lateral shear resistance, facilitating installation and maintenance.

[0030] As the preferred technical solution of this embodiment, Figure 5 As shown, the clamping member includes a two-lobed semicircular clamp 2, one end of which is connected by a high-strength bolt 1, and the other end is connected to the end of a flat steel 4 by a high-strength bolt 1. A rubber pad 3 is also provided inside the two-lobed semicircular clamp 2. The rubber pad 3 can effectively protect the HDPE jacket 8, reduce wear and stress concentration, and provide good shock absorption effect.

[0031] The construction steps of this embodiment are as follows:

[0032] During the construction process, the specific steps are as follows:

[0033] Step 1: Preliminary preparation work, clarify the outer diameter size parameters of the full-bridge HDPE jacket pipe 8 according to the design drawings, determine the installation position and number of the anti-rotation device 10, and determine the size of the clamp 2 and the length of the flat steel 4.

[0034] Step 2: Cut the materials in the factory according to the determined size parameters of the positioning tooling materials, mark them and transport them to the site;

[0035] Step 3: Connect the flat steel 4 to the arc-shaped double-sided baffle seat 7 using the first anchor 5, and connect the other end of the flat steel 4 to the hoop 2 using the high-strength bolt 1;

[0036] Step 4: Place the rubber pad 3 in the upper end clamp 2 and connect it to the upper layer of the HDPE sheath 8 of the inclined cable, and tighten the high-strength bolts 1 at both ends of the clamp 2;

[0037] Step 5: Place the rubber pad 3 in the lower end clamp 2 and connect it to the HDPE sheath 8 of the lower layer of inclined cable, and tighten the high-strength bolts 1 at both ends of the clamp 2;

[0038] Step 6: Adjust the position and direction of the anti-rotation device, and finally tighten the clamps 2 and high-strength bolts 1 at both ends to complete the installation.

[0039] Step 7: Repeat the above steps until the installation of the anti-rotation device 10 of the HDPE sheath pipe 8 of the entire bridge cable is completed.

[0040] Although the present invention has been described in detail above using specific embodiments, it is readily apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, any such modifications or improvements that do not depart from the spirit of the present invention are intended to fall within the scope of protection claimed herein.

Claims

1. A stay cable HDPE pipe anti-rotation device, characterized in that: include: Two clamping members, each used to clamp and fix the two HDPE sheath pipes of the two inclined cables; and a connecting arm, each end of which is connected to the two clamping members, and the connecting arm is also configured to have at least one hinged portion, which enables the connecting arm to adjust the relative distance between the two clamping members.

2. The anti-rotation device for a stay cable HDPE pipe according to claim 1, characterized in that: The connecting arm includes two flat steels, the connected ends of the two flat steels are configured as fork ears and convex holes that are plugged into each other, and are rotatably connected by a first anchor nail to form the hinged portion.

3. The anti-rotation device for a stay cable HDPE pipe according to claim 2, characterized in that: An arc-shaped double-sided baffle seat is also provided at the hinge part, and an arc-shaped hole is provided on the arc-shaped double-sided baffle seat; the two flat steels are clamped in the arc-shaped double-sided baffle seat, one of the flat steels is fixed to the arc-shaped double-sided baffle seat, and the other flat steel is also provided with a second anchor nail near the fork ear, and the second anchor nail is passed through the arc-shaped hole.

4. The anti-rotation device for a stay cable HDPE pipe according to claim 3, characterized in that: The clamping member includes two semicircular hoops, one end of which is connected by bolts, and the other end is connected to the end of the flat steel by bolts. A rubber pad is also provided inside the two semicircular hoops.

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