A combined anchoring structure for prefabricated main cable tower ends of a suspension bridge

Abstract

The present invention discloses a combined anchoring structure for the end of a prefabricated main cable tower of a suspension bridge, which relates to the field of bridge engineering technology. A pre-buried pipe is pre-buried in the bridge tower, and an anchor pad is fixed to the front end thereof. A steel tie rod, a cable anchor head, a shock-absorbing ring, a limiting structure, and a reinforcement ring are coaxially arranged in the pre-buried pipe from front to back. The rear end of the steel tie rod is threadedly connected to the front end of the cable anchor head, and a nut is threadedly fastened to the steel tie rod. The shock-absorbing ring and the limiting structure are sleeved on the outside of the main cable, and the two are tightened together to press against the rear end of the cable anchor head. The pre-buried pipe, the limiting structure, and the reinforcement ring of the present invention constitute an integral anchoring structure with good stability. It can effectively avoid anchoring failure caused by sliding or deflection of the main cable in the pre-buried pipe. At the same time, the stress generated by the tension of the main cable in the anchoring structure can be distributed and borne by the entire anchoring structure and the steel tie rod and transmitted to the bridge tower. Compared with the existing anchoring structure, the stress concentration in the anchoring area is effectively reduced, and the overall compressive performance of the structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a combined anchoring structure connecting a cable body and a bridge tower of a suspension bridge. Background Art

[0002] The main cable anchorage structure of a suspension bridge is used to anchor the main cables of a suspension bridge to the bridge towers. Since the main cables are the main structure in the suspension bridge's support structure responsible for bearing the bridge deck load, the main cable anchorage structure must withstand the huge vertical and horizontal loads generated by the tension of the main cables.

[0003] In existing technology, main cable anchoring structures are mostly annular anchor cup structures. These structures use an annular cup with an inner diameter that matches the cable diameter, which is placed over the cable. The cup utilizes the significant friction and anchoring force between the cup and the cable to anchor the cable. While this main cable anchoring structure has been widely used, it can lead to stress concentration and complex stress conditions in the anchoring area, making it prone to cable retention within the cup and anchor failure.

[0004] Furthermore, the length of a suspension bridge's main cables directly impacts not only the shape and height of the bridge deck but also the load and tension they can withstand. Due to limitations in bridge design, cable processing, and construction techniques, the installed cable length often deviates from the design length required for construction. Existing cable anchoring structures lack the adaptive adjustment capabilities to accommodate cable length deviations. Severe cable length deviations can impact construction progress and even the safe operation of the bridge. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a combined anchoring structure for the prefabricated main cable tower end of a suspension bridge.

[0006] The present invention adopts the following technical solution to solve the technical problem: a combined anchoring structure for the tower end of a prefabricated main cable of a suspension bridge, wherein the end of the main cable is fixed with a cable anchor head, including a pre-buried pipe, a steel tie rod, a nut, an anchor plate, a shock-absorbing ring, a limiting structure and a reinforcement ring;

[0007] The embedded pipe is embedded in the bridge tower, with the front end of the embedded pipe being fixedly connected to the anchor plate, and the rear end extending out of the bridge tower. An adjustment groove is left at the bridge tower corresponding to the anchor plate.

[0008] The steel pull rod, cable anchor head, shock-absorbing ring, limiting structure and reinforcement ring are coaxially arranged in the embedded pipe from front to back; the rear end of the steel pull rod is threadedly connected to the front end of the cable anchor head;

[0009] The nut is located outside the front end of the embedded pipe and is threadedly fastened to the steel pull rod, with its rear end face pressed against the front end face of the anchor plate; the shock-absorbing ring and the limiting structure are in a ring-sleeve structure, both of which are fitted around the outside of the main cable, and the limiting structure acts as an axis-fixing mechanism for the main cable, limiting radial displacement of the main cable;

[0010] The rear end of the shock-absorbing ring is provided with a tightening hole with a diameter increasing from front to back, and the front end of the limiting structure is correspondingly provided with a table-shaped structure with a diameter increasing from front to back. The table-shaped structure is fitted into the tightening hole so that the limiting structure presses the shock-absorbing ring forward to the rear end of the cable anchor head and tightens it outwards.

[0011] The reinforcement ring is connected and fixed to the rear end of the limiting structure, and both the limiting structure and the reinforcement ring are connected and fixed to the embedded pipe.

[0012] Furthermore, it also includes various fixing blocks; the fixing blocks are arranged in the embedded pipe, located behind the reinforcement ring, and are connected and fixed to the rear end surface of the reinforcement ring and the inner side wall of the embedded pipe.

[0013] Furthermore, the fixing blocks are evenly distributed along the circumferential direction.

[0014] Furthermore, it also includes a shock absorber; the shock absorber is arranged at the rear end of the embedded pipe.

[0015] Furthermore, the shock absorber is a damping spring shock absorber.

[0016] Furthermore, the reinforcement ring is welded and fixed to the rear end of the limiting structure, the limiting structure is connected and fixed to the embedded pipe in the form of multi-point full-circle welding, and the reinforcement ring is connected and fixed to the embedded pipe in the form of full-circle welding.

[0017] Furthermore, the limiting structure is further provided with annular positioning rings, and each of the positioning rings is fitted and sleeved outside the main cable to fix the axis of the main cable.

[0018] Furthermore, the end of the steel pull rod is provided with an external thread, and the front end of the cable anchor head is correspondingly provided with an internal thread, and the two are connected by the threaded cooperation of the external thread and the internal thread.

[0019] Furthermore, the main cable is a prefabricated component.

[0020] Furthermore, the steel pull rod is made of alloy steel.

[0021] The present invention provides a combined anchoring structure for a prefabricated main cable tower end of a suspension bridge, which has the following beneficial effects:

[0022] 1. The pre-buried pipe, limiting structure, and reinforcement ring of the present invention form an integrated anchoring structure with good stability. This effectively prevents anchoring failure caused by the main cable sliding or deflecting within the pre-buried pipe. Furthermore, the stress generated by the tension of the main cable in the anchoring structure is distributed and transmitted to the bridge tower by the entire anchoring structure and steel tie rods. Compared with existing anchoring structures, this effectively reduces the stress concentration in the anchoring area and improves the overall compressive performance of the structure.

[0023] 2. The steel tie rod and nut structure of the present invention can realize adaptive adjustment of the axial installation position of the cable anchor head in the embedded pipe. When there is a certain deviation between the actual length of the main cable and the designed length required for construction, it can better realize the anchor connection between the main cable and the bridge tower, thereby ensuring the safety of bridge use.

[0024] 3. The limiting structure of the present invention can effectively realize the axis positioning of the main cable, thereby ensuring the coaxiality of the steel tie rod and the main cable, and improving the stress form of the main cable connection structure;

[0025] 4. The present invention does not require the installation of a cable saddle, has a simple structure, is easy to construct, and is beneficial to the control of construction costs. In addition, its structural force transmission path is more clear, which is beneficial to the maintenance and repair of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the axonometric cross-sectional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0028] Figure 3 It is a cross-sectional view of the present invention at AA.

[0029] In the picture:

[0030] 1. Steel pull rod; 2. Nut; 3. Anchor plate; 4. Embedded pipe; 5. Cable anchor head; 6. Shock-absorbing ring, 61. Tensioning hole; 7. Limiting structure, 71. Platform structure; 8. Main cable; 9. Reinforcement ring; 10. Fixing block; 11. Shock absorber. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] like Figures 1 to 3As shown, its structural relationship is as follows: the end of the main cable 8 is fixed with a cable anchor head 5, which includes a pre-buried pipe 4, a steel pull rod 1, a nut 2, an anchor plate 3, a shock-absorbing ring 6, a limiting structure 7 and a reinforcement ring 9;

[0033] The embedded pipe 4 is embedded in the bridge tower, with the front end fixedly connected to the anchor plate 3, and the rear end extending out of the bridge tower. An adjustment groove is left at the bridge tower corresponding to the anchor plate 3;

[0034] During actual construction, the embedded pipe 4 can be a reinforced concrete pipe, which is embedded in the cast-in-place concrete. This structural form is simple and convenient to construct, and can effectively protect the various components of the anchoring structure and extend the service life of the anchoring structure.

[0035] The steel tie rod 1, cable anchor head 5, shock absorbing ring 6, limiting structure 7 and reinforcement ring 9 are coaxially arranged in the embedded pipe 4 from front to back; the rear end of the steel tie rod 1 is threadedly connected to the front end of the cable anchor head 5;

[0036] The coaxial arrangement of the steel tie rod 1 and the main cable 8 can effectively ensure the stability of the main cable 8, prevent the main cable 8 from being deformed and broken due to connection stress, and is conducive to ensuring the service life of the main cable 8;

[0037] The nut 2 is located outside the front end of the embedded pipe 4 and is threadedly fastened to the steel pull rod 1, with its rear end face pressed against the front end face of the anchor plate 3; the shock-absorbing ring 6 and the limiting structure 7 are in a ring-sleeve structure, both of which are fitted around the main cable 8. The limiting structure 7 acts as an axis-fixing mechanism for the main cable 8, limiting its radial displacement.

[0038] The rear end of the shock-absorbing ring 6 is provided with a tightening hole 61 with a diameter that increases from front to back. The front end of the limiting structure 7 is correspondingly provided with a table-shaped structure 71 with a diameter that increases from front to back. The table-shaped structure 71 is engaged and clamped into the tightening hole 61, so that the limiting structure 7 presses the shock-absorbing ring 6 forward to the rear end of the cable anchor head 5 and tightens it outward.

[0039] Under the tensioning and squeezing action between the tensioning hole 61 and the platform-like structure 71, the shock-absorbing ring 6 is stretched and squeezed outward against the embedded pipe 4, generating a strong tensioning force between the two, which is beneficial to the positioning of the cable anchor head 5 and the main cable 8. At the same time, the platform-like structure 7 is squeezed inward, locking the end of the main cable 8 inside it.

[0040] When the main cable is subjected to external impact vibration, the shock-absorbing ring 6 can absorb or alleviate part of the impact energy through plastic deformation, thereby reducing the vibration amplitude. At the same time, the shock-absorbing ring 6 also plays a role in balancing the pressure inside the anchor structure and coordinating the internal displacement of the structure, which can effectively reduce the impact damage to the anchor structure and maintain the stability of the anchor structure.

[0041] The reinforcement ring 9 is connected and fixed to the rear end of the limiting structure 7 , and both the limiting structure 7 and the reinforcement ring 9 are connected and fixed to the embedded pipe 4 .

[0042] The embedded pipe 4, the limiting structure 7 and the reinforcement ring 9 are connected and fixed to form a rigid structure. The reinforcement ring 9 can improve the strength and stability of the connection between the embedded pipe 4 and the limiting structure 7, thereby improving the bearing capacity and stability of the anchoring structure between the main cable 8 and the bridge tower;

[0043] Preferably, it further includes fixing blocks 10 ; the fixing blocks 10 are arranged in the embedded pipe 4 , behind the reinforcement ring 9 , and are connected and fixed to the rear end face of the reinforcement ring 9 and the inner wall of the embedded pipe 4 .

[0044] The provision of the fixing block 10 can further enhance the structural strength of the connection between the reinforcement ring 9 and the embedded pipe 4. In particular, when the reinforcement ring 9 and the embedded pipe 4 are connected and fixed by welding, the provision of the fixing block 10 can effectively improve the strength of the weld, avoid loosening and failure of the connection caused by weld defects, and ensure the stability and reliability of the anchoring structure.

[0045] Preferably, the fixing blocks 10 are evenly distributed along the circumferential direction.

[0046] In actual configuration, the number of the fixing blocks 10 may be set to 6, and the angular spacing between adjacent fixing blocks 10 is 60°.

[0047] Preferably, a shock absorber 11 is further included; the shock absorber 11 is arranged at the rear end of the embedded pipe 4.

[0048] Preferably, the shock absorber 11 is a damping spring shock absorber.

[0049] Preferably, the reinforcement ring 9 is welded and fixed to the rear end of the limiting structure 7, the limiting structure 7 is connected and fixed to the embedded pipe 4 in the form of multi-point full-circle welding, and the reinforcement ring 9 is connected and fixed to the embedded pipe 4 in the form of full-circle welding.

[0050] Preferably, the limiting structure 7 is further provided with annular positioning rings, and each positioning ring is fitted and sleeved outside the main cable 8 to fix the axis of the main cable 8 .

[0051] Preferably, the end of the steel pull rod 1 is provided with an external thread, and the front end of the cable anchor head 5 is correspondingly provided with an internal thread, and the two are connected by the external thread and the internal thread.

[0052] Preferably, the main cable 8 is a prefabricated component.

[0053] During actual construction, when the length of the suspension bridge meets the design requirements, the main cable 8 can be prefabricated in the factory to effectively reduce the workload on the construction site, which is conducive to improving construction efficiency, shortening construction period and controlling construction costs.

[0054] Preferably, the steel tie rod 1 is made of alloy steel.

[0055] When selecting materials, the tensile strength and torsional strength requirements of the steel tie rod 1 should be fully considered so that the steel tie rod 1 can bear sufficiently large loads and stresses while providing adaptive adjustment of the length deviation of the main cable 8 to ensure the safety of the project.

[0056] When the main cable 8 of the above-mentioned anchoring structure is subjected to tension, part of the tension is transmitted to the steel pull rod 1 through the cable anchor head 5, and then transmitted to the bridge tower through the nut 2 and the anchor plate 3. The other part of the tension is shared by the limiting structure 7, the reinforcement ring 9 and the fixing block 10, and transmitted to the bridge tower through the embedded pipe 4.

[0057] The specific construction process includes the following:

[0058] The first step is to pre-embed the embedded pipe 4 in the bridge tower. After the pre-embedded construction is completed, the anchor plate 3 is welded to the front end of the embedded pipe 4.

[0059] The second step is to tension the main cable 8 so that the end of the main cable 8 and the cable anchor 5 are inserted into the embedded pipe, and then the steel tie rod 1 is threadedly connected to the cable anchor 5, and the nut 2 is pre-tightened onto the steel tie rod 1 outside the front end of the embedded pipe 4;

[0060] In the third step, the shock-absorbing ring 6 and the limiting structure 7 are sequentially installed into the embedded pipe 4 from the rear end thereof, and a pre-pushing force is applied to the limiting structure 7 until the shock-absorbing ring 6 is pressed against the rear end of the cable anchor head 5. At the same time, the platform-shaped structure 71 cooperates with the clamping hole 61 to tighten the shock-absorbing ring 6. At this time, the shock-absorbing ring 6 locks the main cable 8 inward, realizing the axial limitation of the main cable 8 and limiting the position of the main cable 8 axis.

[0061] The fourth step is to install the reinforcement ring 9 through the rear port of the embedded pipe 4, weld the limiting structure 7 and the reinforcement ring 9 to the embedded pipe 4 in a whole circle, and weld the reinforcement ring 9 to the rear end of the limiting structure 7;

[0062] The fifth step is to install six fixing blocks 10 through the rear port of the embedded pipe 4, and evenly distribute the fixing blocks 10 along the circumference. The fixing blocks 10 are welded to the rear end surface of the embedded pipe 4 and the reinforcement ring 9 to strengthen the weld strength.

[0063] The sixth step is to install a shock absorber at the rear port of the embedded pipe 4 to complete the construction.

[0064] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A prefabricated main cable tower end combined anchoring structure for a suspension bridge, wherein the end of the main cable (8) is fixedly provided with a cable anchor head (5), characterized in that: It includes a pre-buried pipe (4), a steel tie rod (1), a nut (2), an anchor plate (3), a shock-absorbing ring (6), a limiting structure (7) and a reinforcement ring (9); The embedded pipe (4) is embedded in the bridge tower, and its front end is fixedly connected to the anchor plate (3), and its rear end extends out of the bridge tower, and an adjustment groove is reserved on the bridge tower corresponding to the anchor plate (3); the steel tie rod (1), cable anchor head (5), shock-absorbing ring (6), limiting structure (7) and reinforcement ring (9) are coaxially arranged in the embedded pipe (4) from front to back; the rear end of the steel tie rod (1) is threadedly connected to the front end of the cable anchor head (5); The nut (2) is located outside the front end of the embedded pipe (4), and is threadedly fastened to the steel pull rod (1), with its rear end face pressed against the front end face of the anchor plate (3); the shock-absorbing ring (6) and the limiting structure (7) are in a ring-sleeve structure, and both are fitted around the outside of the main cable (8), and the limiting structure (7) acts as an axis-fixing mechanism for the main cable (8), thereby limiting the radial displacement of the main cable (8); The rear end of the shock-absorbing ring (6) is provided with a tightening hole (61) with a diameter increasing from front to back, and the front end of the limiting structure (7) is correspondingly provided with a table-shaped structure (71) with a diameter increasing from front to back. The table-shaped structure (71) is fitted into the tightening hole (61) so that the limiting structure (7) presses the shock-absorbing ring (6) forward to the rear end of the cable anchor head (5) and tightens it outward. The reinforcement ring (9) is connected and fixed to the rear end of the limiting structure (7), and both the limiting structure (7) and the reinforcement ring (9) are connected and fixed to the embedded pipe (4); It also includes fixing blocks (10); the fixing blocks (10) are arranged in the embedded pipe (4), located behind the reinforcement ring (9), and connected and fixed to the rear end surface of the reinforcement ring (9) and the inner wall of the embedded pipe (4); The fixed blocks (10) are evenly distributed along the circumferential direction; It also includes a shock absorber (11); the shock absorber (11) is arranged at the rear end of the embedded pipe (4).

2. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The shock absorber (11) is a damping spring shock absorber.

3. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The reinforcement ring (9) is welded and fixed to the rear end of the limiting structure (7), the limiting structure (7) is connected and fixed to the embedded pipe (4) in the form of multi-point full-circle welding, and the reinforcement ring (9) is connected and fixed to the embedded pipe (4) in the form of full-circle welding.

4. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The limiting structure (7) is further provided with annular positioning rings, each of which is fitted onto the outside of the main cable (8) and serves to fix the axis of the main cable (8).

5. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The end of the steel pull rod (1) is provided with an external thread, and the front end of the cable anchor head (5) is correspondingly provided with an internal thread, and the two are connected by the external thread and the internal thread.

6. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The main cable (8) is a prefabricated component.

7. The prefabricated main cable tower end combined anchorage structure for a suspension bridge according to claim 1, characterized in that: The steel pull rod (1) is made of alloy steel.

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