Stay cable anti-sliding device

Abstract

The utility model discloses an anti-sliding device for a stay cable. The anti-sliding device comprises an adjusting anchorage device and a fixing anchorage device which are arranged on the two sides of a cable saddle respectively. The fixing anchorage device is provided with a fixing anti-sliding key penetrating through the wire dividing pipe, and a Haver anti-sliding ring and a fixing anti-sliding pressing plate are arranged between the fixing anti-sliding key and the wire dividing pipe. The adjusting anchorage device is provided with an adjusting anti-sliding key, and the adjusting anti-sliding key is connected with an adjusting anti-sliding pressing plate in a fastened mode through an anchoring adjusting cylinder. The fixed anti-sliding keys and the adjusting anti-sliding keys are extrusion type anti-sliding keys which are pressed on the steel strands in advance. The stay cable solves the problem that the anti-sliding performance of an existing stay cable single-side and two-way anti-sliding technology is limited.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-slip of stay cables, in particular to an anti-slip device for stay cables and an installation method thereof. Background Technique

[0002] With the progress of society and the acceleration of the urbanization process, road traffic, as an important infrastructure for urban development, is facing increasing traffic pressure. Against this background, the low tower cable-stayed bridge, as a bridge structure with unique advantages, has been increasing in construction quantity. The low tower cable-stayed bridge, with its relatively low tower height and unique stay cable layout, can effectively reduce the impact on the surrounding environment while ensuring the bearing capacity of the bridge, so it has been widely used.

[0003] A low tower cable-stayed bridge has multiple bundles of stay cables, and each bundle of stay cables contains multiple steel strands with PE small sheaths. After these stay cables pass through the cable tower, they are anchored on the beam bodies on both sides of the cable tower. Inside the cable tower, each bundle of stay cables passes through a pre-embedded turning saddle for turning. To avoid wear of the steel strands at the saddle, it is required that the cable body in the saddle does not slip as much as possible. The turning saddle is welded by multiple hollow wire separating tubes, end plates on both sides and reinforcing rib plates. The wire separating tubes are made into a curved shape according to the requirements of the turning angle of the stay cables.

[0004] However, although the low tower cable-stayed bridge has many structural advantages, the anti-slip performance of its stay cables has always been one of the technical difficulties. The early solution was to pour epoxy mortar into the turning saddle and use the gripping force of the epoxy mortar on the steel strands to achieve the purpose of anti-slip. This method is not only complex in construction but also not conducive to the later inspection and replacement of the steel strands. The subsequent anti-slip key anti-slip technology is to install an anti-slip key on a single steel strand, which can be stuck on the end face of the wire separating tube to achieve one-way anti-slip (the outer diameter of the anti-slip key is larger than the diameter of the wire separating tube, and the steel strand can only penetrate into the saddle in one direction), and the single steel strand can be taken out for inspection and replacement. The unilateral two-way anti-slip technology (anti-slip device for stay cables and its installation method, patent number: ZL 2020 11419137.2) adopted by the applicant before, its anti-slip device is only installed on one side of the saddle, and an anchoring cylinder, an anti-slip insert piece, an insert piece pressing ring, etc. are added at the unilateral anti-slip end to lock the anti-slip key on the steel strand on the end plate of the saddle; although it improves the anti-slip performance of the stay cables to a certain extent, there are still the following defects in practice: Limited anti-slip performance: Since the anti-slip device is only installed on one side of the saddle, the steel strand is not anchored at the other end of the saddle, and the slippage of the steel strand in the saddle cannot be comprehensively restricted. When the steel strand in the saddle is subjected to external forces, the steel strand in the saddle will still slip, and this anti-slip design makes the steel strand in the saddle prone to wear during long-term use, thus affecting the service life of the stay cable. Content of the Utility Model

[0005] The object of the present utility model is to provide an anti-slip device for stay cables, which can solve the problem of limited anti-slip performance in the existing unilateral two-way anti-slip technology for stay cables.

[0006] To solve the above problems, the technical solution adopted by the present utility model is as follows: This anti-slip device for stay cables includes a fixed anchor and an adjusting anchor respectively installed on both sides of the saddle. The adjusting anchor is arranged on the cable-piercing side of the saddle, and the fixed anchor is arranged on the cable-exiting side of the saddle. A fixed anti-slip key passing through the wire dividing tube of the saddle is provided inside the fixed anchor. An anti-slip ring and a fixed anti-slip pressing plate are arranged between the fixed anti-slip key and the wire dividing tube. An adjusting anti-slip key is provided inside the adjusting anchor. An adjusting anti-slip pressing plate is arranged between the adjusting anti-slip key and the wire dividing tube. The adjusting anti-slip key is tightly connected to the adjusting anti-slip pressing plate through an anchoring adjusting cylinder.

[0007] In the technical solution of the above anti-slip device for stay cables, a more specific technical solution may further be: The length of the fixed anti-slip key is shorter than that of the adjusting anti-slip key.

[0008] In some possible implementation manners, the outer periphery of the fixed anti-slip key is a smooth surface.

[0009] In some possible implementation manners, both the fixed anti-slip key and the adjusting anti-slip key are hollow cylinders.

[0010] In some possible implementation manners, a lining sleeve is arranged between the hollow cylinder and the steel strand.

[0011] In some possible implementation manners, the adjusting anti-slip key has an external thread section, and the anchoring adjusting cylinder is threadedly connected to the adjusting anti-slip key through this external thread section.

[0012] Due to adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art:

[0013] 1. By installing a fixed anchor and an adjusting anchor on both sides of the saddle respectively, two-way restraint of the stay cable in the saddle is realized. Different structures but complementary functions of anti-slip components are adopted on both sides of the saddle. The fixed anchor internally integrates a multi-level anti-slip structure of an anti-slip key, a split anti-slip ring, and an anti-slip pressing plate, focusing on stable locking. The adjusting anchor realizes dynamic adjustment and stable fixation of the steel strand through the anchoring adjusting cylinder. This asymmetric anti-slip structure design on both sides of the saddle can more flexibly cope with complex and variable load adjustments, improve the overall anti-slip performance, effectively curb the two-way sliding phenomenon of the steel strand under complex load conditions, facilitate maintaining long-term anti-slip performance, and the anti-slip force is stable and lasting.

[0014] 2. The fixed anti-slip key is designed to have a smooth surface and a short length, which can significantly improve its smoothness and adaptability when passing through wire dividing tubes with different curvatures, reduce friction, and improve the installation efficiency.

[0015] 3. The threaded connection structure of the anchoring adjustment cylinder and the adjustment anti-slip key has a self-locking property. When the connecting piece is subjected to an axial force, a certain amount of friction will be generated at the connecting part, making the connection more stable. This self-locking property helps to resist external vibration or impact and maintain the stability of the structure; it is convenient to adjust the tightness of the connection, so as to adapt to the force requirements under different working conditions. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the cable-stayed cable anti-slip device.

[0017] Figure 2 It is a schematic structural diagram of the fixed anchor.

[0018] Figure 3 It is a schematic structural diagram of the adjustment anchor.

[0019] Description of the reference numerals: 1. Saddle; 2. Fixed anchor; 3. Adjustment anchor; 4. Wire dividing tube; 5. Anchor backing plate; 6. Fixed anti-slip pressure plate; 7. Half-round anti-slip ring; 8. Fixed anti-slip key; 9. Anti-slip anchoring cylinder; 10. Locking sleeve; 11. Connecting sleeve; 12. Expansion pipe flange; 13. Expansion pipe; 14. Cable clamp; 15. Steel strand; 16. Adjustment anti-slip pressure plate; 17. Anchoring adjustment cylinder; 18. Adjustment anti-slip key. Detailed Embodiment

[0020] The following further details the present utility model in conjunction with the embodiments of the drawings:

[0021] Figures 1 to 3 The shown cable-stayed cable anti-slip device aims to improve the stability and anti-slip performance of the cable-stayed cable system through a specific anti-slip anchor joint. The device mainly includes a fixed anchor 2 and an adjustment anchor 3 respectively installed on both sides of the saddle 1. Anti-slip structures are provided inside both of these anchors. The anti-slip structures on both sides of the saddle 1 are asymmetric structures, and they act together on the steel strand and abut against the saddle to effectively prevent the steel strand from slipping during long-term use. The saddle 1, as a part of the bridge structure, is arranged inside the bridge tower 19 and is used to support and guide the direction of the cable-stayed cable. Inside the saddle, a wire dividing tube is designed, which is a component of the saddle 1 and is used to separate and fix each steel strand bundle that makes up the steel strand 15, ensuring that the steel strand 15 is arranged orderly and passes through the saddle 1 stably.

[0022] Such as Figure 1 、 Figure 2 and Figure 3As shown, the fixed anchor 2 is arranged on the side where the steel strand 15 passes through the saddle 1. On the steel strand 15, a fixed anti-slip key 8 is pre-installed at the corresponding position on the cable-pulling side of the saddle 1 by extrusion, so that the fixed anti-slip key 8 closely adheres to the surface of the steel strand 15 to provide sufficient friction to prevent slipping. The outer periphery of the fixed anti-slip key 8 is designed with a smooth surface, so that when the fixed anti-slip key 8 follows the steel strand 15 through the wire dividing tube 4 of the saddle 1, unnecessary friction between the fixed anti-slip key 8 and the inner wall of the wire dividing tube 4 can be reduced. It is worth mentioning that the length of the anti-slip key is short and can pass through wire dividing tubes with different curvatures. To anchor the fixed anchor 8 on one side of the saddle, a fixed anti-slip pressing plate is arranged on the cable-pulling side of the saddle 1. The fixed anti-slip key 8 can pass through the fixed anti-slip pressing plate 6. A split-type Hafer anti-slip ring 7 is arranged between the fixed anti-slip key 8 and the fixed anti-slip pressing plate 6. One end of the Hafer anti-slip ring 7 is inserted into the fixed anti-slip pressing plate 6, and the other end abuts against the fixed anti-slip key 8. When the fixed anti-slip key 8 is subjected to the tensile force from the cable-pulling side, the two halves of the Hafer anti-slip ring 7 will tightly bite together to form a stable locking. This biting effect not only enhances the anti-slip effect, but also presses the anti-slip pressing plate more firmly against the anchor backing plate 5 on one side of the saddle 1 to achieve anchoring. To protect the anti-slip components at the tower end, the fixed anchor 2 is also provided with an anti-slip anchoring cylinder 9. One end of the anti-slip anchoring cylinder 9 is fixedly connected to the anchor backing plate 5 of the saddle 1 by bolts, and the other end is fixedly connected to the connecting sleeve 11 by bolts. The connecting sleeve 11 is welded and fixed to the expansion pipe flange 12 and cooperates with the locking sleeve located therein to lock and telescopically connect the expansion pipe 13 of the telescopic connecting device 20. Cable clamps 14 for locking the steel strand bundle 15 are installed at both ends inside the expansion pipe 13. A waterproof cover 21 connected to the beam-end embedded pipe is also installed at the other end of the expansion pipe 13. The other end of the embedded pipe is provided with a beam-end anchor 23, and the beam-end anchor 23 is provided with a protective cover 22.

[0023] As Figure 1 and Figure 3As shown, the adjusting anchor 3 is installed on the cable-penetrating side of the saddle 1. The adjusting anti-slip key is pre-installed on the steel strand 15 by extrusion. This anti-slip key not only has the anti-slip function but also has an external thread section to facilitate the adjustment connection with the anchoring adjusting cylinder 17. This design allows, when the cable tension of the stay cable changes, to maintain the stability of the steel strand by adjusting the relative position between the adjusting anti-slip key 18 and the saddle 1. The length of the adjusting anti-slip key 18 is longer than that of the fixed anti-slip key 8. On the one hand, it can prevent the adjusting anti-slip key 18 from accidentally passing through the wire dividing tube 4 during the cable-passing process. On the other hand, it increases the adjustable length range between the adjusting anti-slip key 18 and the anchoring adjusting cylinder 17, thus being able to better adapt to different installation and adjustment requirements. By rotating the anchoring adjusting cylinder 17 and using its threaded connection with the adjusting anti-slip key 18, the adjusting anti-slip pressing plate 16 provided on the cable inlet side of the saddle 1 can be further pressed tightly on the anchor backing plate 5 to achieve a stable anchoring effect. The anti-slip anchoring cylinder of the adjusting anchor 3 and other anchor components are the same as those of the corresponding components of the fixed anchor 2, and will not be elaborated here.

[0024] In some possible implementation schemes, the installation method of the stay cable anti-slip device of the present invention includes the following steps:

[0025] A. Install the pressing fixed anti-slip key 8 and the adjusting anti-slip key 18 in advance at positions corresponding to both ends of the saddle 1 on the steel strand 15; both types of anti-slip keys are hollow cylinders, and a lining sleeve is provided between the hollow cylinder and the steel strand, designed to be sleeved on the steel strand 15, and achieve a stable anchoring with the steel strand 15 through extrusion on the periphery;

[0026] B. Insert the steel strand 15 into the wire dividing tube 4 of the saddle from the end where the fixed anti-slip key 8 is installed. After the fixed anti-slip key 8 completely passes through the wire dividing tube 4, insert the two-half split anti-slip ring 7 into the fixed anti-slip pressing plate 6 to prevent the fixed anti-slip key 8 from retracting into the wire dividing tube 4;

[0027] C. Apply a pre-tightening force to the steel strand 15 at the other end of the saddle 1. This pre-tightening force needs to be greater than the bridge-forming cable force of the steel strand 15 to ensure that the steel strand does not slip in the wire dividing tube 4 under the bridge-forming operation state (when a single steel strand is under a lateral load of 100 KN on both sides, the slip amount of the steel strand at the saddle is not more than 1 mm); after applying the pre-tightening force, tighten the anchoring adjusting cylinder 17. Through its threaded connection with the adjusting anti-slip key 18 and the pressing effect on the adjusting anti-slip pressing plate 16, both the fixed anti-slip key 8 and the adjusting anti-slip key 18 are firmly anchored at both ends of the saddle.

[0028] The present utility model has successfully achieved the bilateral and two-way high-efficiency anti-slip function required for the cable-stayed bridge, significantly reducing the slip amount of the steel strand in the saddle under the action of unilateral eccentric load, thus greatly reducing the wear of the steel strand protective layer and effectively extending the service life of the stay cable. In addition, the stay cable anti-slip device of the present utility model provides a stable and lasting anti-slip force.

[0029] The above-described embodiments only show several specific implementation manners of the present utility model. Although the description is relatively specific and detailed, it should not be construed as a limitation on the scope of patent protection of the present utility model. It should be clear that for those of ordinary skill in the art, various deformations and improvements can be made to the present utility model without departing from the core concept and basic principles of the present utility model. These deformations and improvements should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. A cable anti-slip device, characterized in that: It includes a fixed anchor and an adjusting anchor respectively installed on both sides of the saddle. The adjusting anchor is arranged on the cable-penetrating side of the saddle, and the fixed anchor is arranged on the cable-exiting side of the saddle. A fixed anti-slip key passing through the wire dividing tube of the saddle is provided in the fixed anchor. An anti-slip ring and a fixed anti-slip pressing plate are arranged between the fixed anti-slip key and the wire dividing tube. An adjusting anti-slip key is provided in the adjusting anchor. An adjusting anti-slip pressing plate is arranged between the adjusting anti-slip key and the wire dividing tube. The adjusting anti-slip key is tightly connected with the adjusting anti-slip pressing plate through an anchoring adjusting cylinder.

2. The anti-slip device for stay cables according to claim 1, wherein: The length of the fixed anti-slip key is shorter than that of the adjusting anti-slip key.

3. The cable anti-slip device according to claim 2, characterized in that: The outer periphery of the fixed anti-slip key is a smooth surface.

4. The anti-slip device for stay cables according to claim 3, characterized in that: Both the fixed anti-slip key and the adjusting anti-slip key are hollow cylinders.

5. The anti-slip device for stay cables according to claim 4, characterized in that: A lining sleeve is arranged between the hollow cylinder and the steel strand.

6. The anti-slip device for stay cables according to any one of claims 1 to 5, characterized in that: The adjusting anti-slip key is provided with an external thread section, and the anchoring adjusting cylinder is threadedly connected with the adjusting anti-slip key through this external thread section.

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