Stay cable capable of releasing torsional stress
By setting a rotating device between the lower end of the HDPE sheath and the waterproof cover, the problem of torsional stress accumulation caused by wind blowing of the HDPE sheath is solved, and the effective release of torsional stress is achieved, preventing weld fractures and ensuring structural stability.
Patent Information
- Application Number
- CN202422197525.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-07
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-07
AI Technical Summary
The HDPE sheath of the cable-stayed bridge is accumulated due to wind blowing, which can easily cause weld fractures, and the prior art cannot effectively release torsional stress.
在HDPE护套管下端与防水罩之间设置旋转装置,包括旋转支座和轴承,允许HDPE护套管下端自由旋转以释放扭转应力。
Effectively prevent the butt welding welds of the HDPE sheath casing from cracking, and synchronously release the upper end torsional stress through the rotating device to ensure structural stability.
Smart Images
Figure CN223074601U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a stay cable, in particular to an inclined stay cable capable of releasing torsional stress. Background Art
[0002] In bridge construction, steel strand stay cables are widely used. Especially in cable-stayed bridges, steel strand stay cables are used for those with relatively large spans. The structure of the steel strand stay cable is as Figure 1 shown. The upper end of the HDPE sheath tube of the stay cable extends into the expansion cylinder, and the upper end of the HDPE sheath tube can freely expand, contract and rotate. There is no restraint at the upper end of the HDPE sheath tube. While the lower end of the HDPE sheath tube is connected to the waterproof cover (the lower end of the HDPE sheath tube is threadedly connected to the waterproof cover, and the structure is as Figure 2 shown). The waterproof cover bears the weight of the HDPE sheath tube and covers the embedded pipe. Generally, the length of the sheath tube of the stay cable is 6 meters per root, and they are welded into the length of the bridge stay cable at the construction site. Some stay cables are more than 100 meters long and are formed by butt-welding many pipes. After the stay cable is installed, due to the wind, especially when it is raining, because of the wind, the HDPE sheath tube will rotate. Since there is no restraint at the upper end of the HDPE sheath tube and it can rotate freely, while the lower end of the HDPE sheath tube is fixed by pressing on the embedded pipe through the waterproof cover and cannot rotate freely. Once the upper end of the HDPE sheath tube rotates, a torsional stress will be generated. As the torque increases, it is easy to cause the butt-weld seam of the HDPE sheath tube to break. Summary of the Invention
[0003] The technical problem to be solved by the utility model is to provide an inclined stay cable capable of releasing torsional stress. A rotating device is added to this stay cable. The lower end of the HDPE sheath tube is connected to the waterproof cover by the rotating device, so that the lower end of the HDPE sheath tube can rotate, and the torsional stress generated by the rotation of the upper end of the HDPE sheath tube can be released to prevent the weld seam from cracking.
[0004] The technical solution for solving the above technical problem is: an inclined stay cable capable of releasing torsional stress, including an upper end anchor assembly, an expansion cylinder, an HDPE sheath tube, a steel strand cable body, a waterproof cover, an embedded pipe and a lower end anchor assembly. The upper end of the HDPE sheath tube is located in the expansion cylinder, and a rotating device is further included. The lower end of the HDPE sheath tube is connected to the waterproof cover by the rotating device.
[0005] Further, the rotating device includes a rotating support and a bearing. An installation seat is arranged at the upper end of the waterproof cover. The rotating support is installed on the installation seat through the bearing. A connecting sleeve is installed on the inner wall of the lower end of the HDPE sheath tube, and the connecting sleeve inside the lower end of the HDPE sheath tube is threadedly connected to the rotating support.
[0006] Further, the rotary support is successively connected with a small cylinder, an annular plate and a large cylinder from top to bottom. The small cylinder is connected to the inner hole of the annular plate, the large cylinder is connected to the periphery of the annular plate, the mounting seat and the bearing are located inside the large cylinder, the bearing is connected to the annular plate, and the outer wall of the small cylinder is threadedly connected to a connecting sleeve inside the lower end of the HDPE protective sleeve.
[0007] Further, the bearing is a thrust ball bearing.
[0008] The utility model is provided with a rotating device at the lower end of the HDPE protective sleeve. The lower end of the HDPE protective sleeve is connected to the waterproof cover by the rotating device. When the upper end of the HDPE protective sleeve rotates, the lower end is not restricted and can rotate together with the whole pipe, which can ensure that the whole HDPE protective sleeve can rotate freely, prevent the HDPE protective sleeve from generating torsional internal stress due to the rotation of the upper end and non-rotation of the lower end, and prevent the butt-weld seam of the HDPE protective sleeve from cracking.
[0009] Next, in combination with the drawings and embodiments, the technical features of a stay cable capable of releasing torsional stress according to the utility model will be further described. Description of the Drawings
[0010] Figure 1 : Schematic diagram of the existing stay cable structure.
[0011] Figure 2 : Schematic diagram of the connection between the lower end of the HDPE protective sleeve of the existing stay cable and the waterproof cover.
[0012] Figure 3 : Schematic diagram of the connection between the lower end of the HDPE protective sleeve of the utility model and the waterproof cover.
[0013] Figure 4 : Schematic diagram of the structure of the rotary support of the utility model.
[0014] In the figure: 1 - upper end anchor assembly, 2 - telescopic cylinder, 3 - HDPE protective sleeve, 4 - steel strand cable body, 5 - waterproof cover, 6 - embedded pipe, 7 - lower end anchor assembly, 8 - transition sleeve, 9 - rotary support, 91 - small cylinder, 92 - annular plate, 93 - large cylinder, 10 - bearing, 11 - connecting sleeve, 12 - mounting seat. Detailed Embodiments Embodiment 1
[0015] A stay cable capable of releasing torsional stress, as Figure 3 - Figure 4 shown, includes an upper end anchor assembly 1, a telescopic cylinder 2, an HDPE protective sleeve 3, a steel strand cable body 4, a waterproof cover 5, an embedded pipe 6 and a lower end anchor assembly 7. The upper end of the HDPE protective sleeve 3 is located inside the telescopic cylinder 2 and can freely expand and rotate. It also includes a rotating device, and the lower end of the HDPE protective sleeve 3 is connected to the waterproof cover 5 through the rotating device.
[0016] In this embodiment, the rotating device includes a rotating support 9 and a bearing 10. An installation base 12 is provided at the upper end of the waterproof cover 5. A connecting sleeve 11 is installed on the inner wall of the lower end of the HDPE casing 3. The rotating support 9 is successively connected from top to bottom by a small cylinder 91, an annular plate 92, and a large cylinder 93. The small cylinder 91 is connected to the inner hole of the annular plate 92, and the large cylinder 93 is installed on the periphery of the annular plate 92. The installation base 12 and the bearing 10 are located inside the large cylinder 93. The bearing 10 is connected to the annular plate 92, and the outer wall of the small cylinder 91 is threadedly connected to the connecting sleeve 11 inside the lower end of the HDPE casing 3. That is, the rotating support 9 is installed on the installation base 12 through the bearing 10, the connecting sleeve 11 inside the lower end of the HDPE casing 3 is connected to the rotating support 9 by threads, and a transition sleeve 8 is also installed on the outer side of the lower end of the HDPE casing 3. The rotating support 9 can rotate freely, and the lower end of the HDPE casing 3 connected to the rotating support 9 can also rotate freely.
[0017] In this embodiment, the bearing 10 is a thrust ball bearing. As a variation, other types of bearings can also be used, but the use effect is not as good as that of the thrust ball bearing.
[0018] The specific structures of the upper end anchor assembly 1, the telescopic cylinder 2, the HDPE casing 3, the steel strand cable body 4, the waterproof cover 5, the embedded pipe 6, and the lower end anchor assembly 7 of the present utility model are the same as those in the prior art. Except for the connection method between the lower end of the HDPE casing 3 and the waterproof cover 5, which is different from that in the prior art, the connection methods of other components are the same as those in the prior art, and will not be elaborated here.
[0019] The actual use effect data of the first embodiment of the present utility model installed on a bridge are shown in the following table.
[0020]
[0021] As can be seen from the above table, the lower end of the HDPE casing of the present utility model can basically rotate synchronously with the upper end, and the force generated by the rotation of the upper end of the HDPE casing can be released, preventing the butt weld of the HDPE casing from cracking.
Claims
1. A stay cable capable of releasing torsional stress, comprising an upper end anchor assembly (1), a telescopic cylinder (2), an HDPE sheath (3), a strand cable body (4), a waterproof cover (5), a buried pipe (6) and a lower end anchor assembly (7). The upper end of the HDPE sheath (3) is located inside the telescopic cylinder. It is characterized in that: It further includes a rotating device, and the lower end of the HDPE protective sleeve (3) is connected to the waterproof cover through the rotating device.
2. The stay cable capable of releasing torsional stress according to claim 1, characterized in that: The rotating device includes a rotating support (9) and a bearing (10). An installation seat (12) is provided at the upper end of the waterproof cover (5). The rotating support is installed on the installation seat through the bearing. A connecting sleeve (11) is installed on the inner wall of the lower end of the HDPE protective sleeve. The connecting sleeve (11) inside the lower end of the HDPE protective sleeve (3) is connected to the rotating support (9) by threads.
3. The stay cable capable of releasing torsional stress according to claim 2, wherein: The rotating support (9) is successively connected with a small cylinder (91), an annular plate (92) and a large cylinder (93) from top to bottom. The small cylinder is connected to the inner hole of the annular plate, and the large cylinder is connected to the periphery of the annular plate. The installation seat (12) and the bearing (10) are located inside the large cylinder (93). The bearing (10) is connected to the annular plate (92). The outer wall of the small cylinder (91) is threadedly connected to the connecting sleeve (11) inside the lower end of the HDPE protective sleeve (3).
4. The stay cable capable of releasing torsional stress according to claim 2, characterized in that: The bearing is a thrust ball bearing.