A kind of folded abdominal groove shaped steel anchor box formula combined cable tower anchoring structure and construction method

Abstract

The application discloses a folded-belly channel steel anchor box type combined cable tower anchoring structure and a construction method, relates to the technical field of bridge structures, and comprises folded-belly channel steel anchor boxes, concrete tower walls and cable-stayed cables which are connected in an up-down stacking mode in several segments; the concrete tower walls surround the outer sides of the folded-belly channel steel anchor boxes; the folded-belly channel steel anchor boxes comprise two folded bellies and two channel steel anchor boxes; the two ends of the folded bellies are connected with the two channel steel anchor boxes respectively, and the folded bellies and the channel steel anchor boxes are connected to form a ring-shaped closed structure; the concrete tower walls comprise end tower walls and side tower walls, the end tower walls are arranged at intervals between the channel steel anchor boxes, and the side tower walls are connected with the channel steel anchor boxes; the cable-stayed cables are arranged in the end tower walls and connected with the channel steel anchor boxes. The application can reduce the tensile stress of the concrete of the end tower walls, improve the utilization rate of steel materials, is convenient to construct, and is suitable for the arrangement of cable-stayed cables in a multi-anchor-head and space cable surface.

Description

Technical Field

[0001] This application relates to the technical field of bridge structures, and in particular to a folded-web grooved steel anchor box type composite cable tower anchoring structure and construction method. Background Technology

[0002] The pylon anchorage structure needs to distribute and transfer the concentrated force of the cables across the entire cross-section of the pylon, making it a critical structural design component affecting the overall safety of a cable-stayed bridge. In recent years, there has been a growing trend of long-span cable-stayed bridges employing composite pylon anchorage structures. These structures utilize steel anchor beams or anchor boxes to bear the horizontal tension of the cables, while the concrete tower walls bear the vertical pressure. This approach fully leverages the material advantages of both steel and concrete, making it a rational form of pylon anchorage.

[0003] The steel anchor beam type composite cable tower anchorage structure uses steel anchor beams on the inner wall corbels of the tower to bear the horizontal cable force of the stay cables, while the concrete tower wall only bears the vertical cable force and unbalanced horizontal cable force. Its advantages include the elimination of the need for circumferential prestressing and quick and convenient construction; its disadvantages include the need for high precision in installation and positioning, the bending and shearing forces at the junction of the steel wall panel and the tower wall, and the existence of localized tensile stress in the concrete; for stay cable anchorage with multiple anchor heads and spatial cable surfaces, the corbels need to be widened along the transverse direction of the bridge, which can easily lead to insufficient anchorage space at the end tower walls.

[0004] The steel anchor box type composite cable tower anchoring structure uses internal or exposed steel anchor boxes to bear the horizontal cable force of the stay cables. Its advantages include good integrity of the anchoring zone, clear stress distribution, and accurate anchor point positioning. Disadvantages include a larger steel consumption, the end tower wall concrete of the internally mounted design is prone to cracking, the exposed design requires circumferential prestressing, the bottom segment steel anchor box construction and stress distribution are more complex, and the narrow spacing between the steel anchor box webs makes it difficult to meet the anchoring requirements of stay cables with multiple anchor heads and spatial cable surfaces.

[0005] Therefore, it is necessary to design a combined cable tower anchorage structure that can reduce local tensile stress in the end tower wall concrete, improve steel utilization, facilitate construction, and adapt to the spatial arrangement of cable stays. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a folded-web grooved steel anchor box type combined cable tower anchoring structure and its construction method.

[0007] On the one hand, the following technical solution is adopted:

[0008] A composite cable-stayed tower anchoring structure with folded-web grooved steel anchor boxes includes several segments stacked and connected vertically, a concrete tower wall, and stay cables. The concrete tower wall surrounds and connects to the outside of the folded-web grooved steel anchor boxes. The folded-web grooved steel anchor boxes include two folded webs and two grooved steel anchor boxes. The two ends of the folded webs are respectively connected to the two grooved steel anchor boxes, forming a closed annular structure. The concrete tower wall includes end tower walls and side tower walls. The end tower walls are spaced apart from the grooved steel anchor boxes, and the side tower walls are connected to the grooved steel anchor boxes. The stay cables pass through the end tower walls and are connected to the grooved steel anchor boxes.

[0009] Optionally, the channel-shaped steel anchor box includes an end plate and two side plates, with the two ends of the end plate connected to the two side plates respectively to form a channel-shaped structure; the two ends of the folded web are connected to the side plates respectively; the end plate and the end tower wall are spaced apart, and the side plates are connected to the side tower walls.

[0010] Optionally, the end plate has through holes for the stay cables to pass through.

[0011] Optionally, the channel-shaped steel anchor box further includes an anchor plate, a pressure plate, a support plate, and a seat plate; two support plates are provided and arranged vertically and parallel within the channel structure; the seat plate is connected to the side of the two support plates away from the end plate; the pressure plate is provided between the two support plates, with one end connected to the end plate and the other end connected to the seat plate; the anchor plate is provided on the seat plate, and the anchor plate is provided with an anchor head for the stay cable to pass through the seat plate and the anchor plate and then connect to the anchor head.

[0012] Optionally, the support plate is parallel to the stay cable.

[0013] Optionally, each of the channel-shaped steel anchor boxes is connected by two inclined cables.

[0014] Optionally, several rows of welding studs are vertically arranged on the side plate, and the side plate is connected to the concrete tower wall by the welding studs; the welding studs are evenly distributed along the horizontal and vertical directions of the side plate.

[0015] Optionally, the end plate is vertically connected to the two side plates.

[0016] On the other hand, the following technical solution is adopted:

[0017] A construction method for a combined cable tower anchoring structure with a folded-web groove-shaped steel anchor box includes the following steps:

[0018] S1, Fabrication of channel steel anchor boxes; welding anchor plates, seat plates, and support plates into one piece; welding several bearing plates into the support plate, and welding the end plates, side plates, and support plates into a semi-closed box structure to form a channel steel anchor box; wherein, through holes are opened on the end plates, and several rows of welding studs are welded on the side plates; two channel steel anchor boxes are connected by a folded web plate, and the folded web plate is welded to the side plates of the two channel steel anchor boxes;

[0019] S2, installation and splicing of folded-web trough steel anchor boxes; two trough steel anchor boxes are connected by folded web plates to form a single segment folded-web trough steel anchor box; each segment is hoisted and stacked one by one, and the end plates and side plates of the trough steel anchor box are connected by on-site welding or bolts between the upper and lower segments to form a whole;

[0020] S3, Concrete tower wall pouring; concrete is poured in sections from bottom to top using formwork to form the concrete tower wall; the concrete is poured outside the channel-shaped steel anchor box, the end plate does not contact the concrete tower wall, and it contacts the concrete tower wall through the side plate.

[0021] S4, cable tensioning and anchoring; the cable passes through the through hole on the end plate and is fixed to the anchor head, and the anchor head is supported on the anchor plate to form an anchoring device.

[0022] In summary, this application has the following beneficial effects:

[0023] 1. Reduce tensile stress in the end tower wall concrete: Compared with the steel anchor beam anchoring structure, the tensile stress in the concrete mainly occurs on the inner side of the end tower wall, while the tensile stress in the concrete of the steel anchor box scheme mainly occurs on the outer side of the end tower wall; however, the folded-web groove-shaped steel anchor box is disconnected from the end tower wall, and the unbalanced horizontal cable force is transferred to the side tower wall in the form of shear force, so the end tower wall concrete is only subjected to vertical pressure.

[0024] 2. Improve steel utilization: The folded web can expand and contract along the bridge direction, transferring the horizontal component of the stay cable to the two channel-shaped steel anchor boxes to form a self-balancing structure. This avoids excessive transfer of the horizontal cable force to the concrete tower wall, increases the proportion of the horizontal component of the stay cable borne by the steel structure in the anchoring structure, and improves the utilization rate of steel.

[0025] 3. Convenient construction: The side plates and folded webs of the channel steel anchor box can be used as formwork for the concrete side tower wall, reducing the difficulty of pouring concrete for the side tower wall. The connection between the upper and lower anchor boxes can make the anchoring points more accurate, which helps to improve the construction efficiency of the anchoring area.

[0026] 4. Adaptable to spatial anchoring: The anchor support of the channel steel anchor box extends to the side tower wall along the transverse direction of the bridge, increasing the anchoring space of the steel anchor head. It can be used for single cable plane, double cable plane and multi cable plane, and can also be used for inclined cable anchoring of parallel cable plane and spatial cable plane. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall structure of this embodiment;

[0028] Figure 2 This is a schematic diagram of the single-segment folded-web steel anchor box and the stay cable in this embodiment;

[0029] Figure 3 This is an overall top view of this embodiment;

[0030] Figure 4 This is a top view of the single-segment folded-web steel anchor box and the stay cable in this embodiment;

[0031] Figure 5 This is a schematic diagram of the channel-shaped steel anchor box in this embodiment;

[0032] Figure 6 This is a schematic diagram of the anchor plate, support plate, bearing plate and seat plate in this embodiment.

[0033] Explanation of reference numerals in the attached drawings: 1. Concrete tower wall; 101. End tower wall; 102. Side tower wall; 2. Stay cable; 3. Folded web; 4. Channel steel anchor box; 5. End plate; 6. Side plate; 7. Anchor plate; 8. Bearing plate; 9. Support plate; 10. Seat plate; 11. Anchor head; 12. Weld stud; 13. Through hole. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0035] This application discloses a combined cable tower anchoring structure with a folded-web grooved steel anchor box, referring to... Figure 1 The structure comprises several stacked, interconnected segments of folded-web trough-shaped steel anchor boxes, a concrete tower wall 1, and stay cables 2. The concrete tower wall 1 surrounds and connects to the outside of the folded-web trough-shaped steel anchor boxes. Each folded-web trough-shaped steel anchor box includes two folded web plates 3 and two trough-shaped steel anchor boxes 4. The two ends of each folded web plate 3 are connected to the two trough-shaped steel anchor boxes 4, forming a closed annular structure. The concrete tower wall 1 includes end tower walls 101 and side tower walls 102. End tower walls 101 are spaced apart from the trough-shaped steel anchor boxes 4, and side tower walls 102 are connected to the trough-shaped steel anchor boxes 4. Stay cables 2 pass through the end tower walls 101 and are connected to the trough-shaped steel anchor boxes 4.

[0036] Reference Figure 2 and Figure 3 Each channel-shaped steel anchor box 4 is connected to two inclined cables 2. The channel-shaped steel anchor box 4 includes an end plate 5 and two side plates 6. The two ends of the end plate 5 are welded and fixed to the two side plates 6 respectively to form a channel-shaped structure. The end plate 5 and the two side plates 6 are welded perpendicularly to each other. The two ends of the folded web plate 3 are welded to the side plates 6 respectively. A through hole 13 is opened on the end plate 5 for the inclined cables 2 to pass through.

[0037] Reference Figure 4Several rows of welding studs 12 are vertically welded to the side plate 6. After the concrete tower wall 1 is poured, it is connected to the side plate 6 by the welding studs 12. The side wall of the concrete tower wall 1 connected to the side plate 6 is called the side tower wall 102, and the tower wall near the end plate 5 is called the end tower wall 101. The end plate 5 and the end tower wall 101 are spaced apart to reduce the tensile stress on the concrete of the end tower wall 101. The side plate 6 and the side tower wall 102 are connected by welding studs 12.

[0038] Reference Figure 5 and Figure 6 The channel-shaped steel anchor box 4 also includes an anchor plate 7, a pressure plate 8, a support plate 9, and a seat plate 10. The support plate 9 is parallel to the stay cable 2, and two support plates 9 are arranged parallel to each other vertically along the channel structure. The seat plate 10 connects to the side of the two support plates 9 away from the end plate 5. Several pressure plates 8 are provided, distributed at intervals between the two support plates 9 along the length of the end plate, with one end of the pressure plate 8 connected to the end plate 5 and the other end connected to the seat plate 10. The anchor plate 7 is provided on the seat plate 10, and an anchor head 11 is supported and connected on the anchor plate 7 for the stay cable 2 to pass through the end plate 5, seat plate 10, and anchor plate 7 before being inserted and fixed to the anchor head 11.

[0039] The construction method of the combined cable tower anchoring structure of the folded-web groove-shaped steel anchor box in this embodiment includes the following steps:

[0040] S1. Fabrication of the channel steel anchor box 4. The anchor plate 7, seat plate 10, and support plate 9 are welded together. Several bearing plates 8 are welded into the support plate 9. The end plate 5, side plate 6, and support plate 9 are welded together to form a semi-enclosed box structure, thus forming the channel steel anchor box 4. Through holes 13 are opened on the end plate 5, and several rows of welding studs 12 are welded onto the side plate 6. Two channel steel anchor boxes 4 are connected by a folded web plate 3, which is welded to the side plates 6 of the two channel steel anchor boxes 4.

[0041] S2, Installation and splicing of folded-web channel steel anchor boxes. Two channel steel anchor boxes 4 are connected by folded web plates 3 to form a single segment folded-web channel steel anchor box. Each segment is hoisted and stacked one on top of the other. The end plates 5 and side plates 6 of the channel steel anchor box 4 are connected between the upper and lower segments by on-site welding or bolting to form a whole.

[0042] S3, Concrete tower wall 1 pouring. Concrete is poured in sections from bottom to top using formwork to form concrete tower wall 1. The concrete is poured outside the channel-shaped steel anchor box 4, and the end plate 5 does not contact the concrete tower wall 1, but contacts the concrete tower wall 1 through the side plate 6.

[0043] S4, tensioning and anchoring of stay cable 2. Stay cable 2 passes through the through hole 13 on end plate 5 and is fixed to anchor head 11. Anchor head 11 is supported on anchor plate 7 to form an anchoring device. The horizontal component of the stay cable 2 is borne by the side plate 6 of the channel steel anchor box 4, and the vertical component is transmitted to the side plate 6 through support plate 9, and then to the concrete tower wall 1 through weld studs 12.

[0044] The folded-web grooved steel anchor box type combined cable tower anchoring structure described in this case can reduce the tensile stress of the concrete of the end tower wall 101. The two grooved steel anchor boxes 4 form a self-balancing structure to bear the horizontal component of the stay cable 2, thereby improving the utilization rate of steel materials, facilitating construction, reducing the difficulty of pouring concrete tower wall 1, and adapting to the spatial arrangement of stay cable 2.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A combined cable tower anchoring structure with a folded-web groove-shaped steel anchor box, characterized in that: The structure comprises several stacked, interconnected segments of folded-web trough-shaped steel anchor boxes, concrete tower walls, and stay cables. The concrete tower walls are connected to the outside of the folded-web trough-shaped steel anchor boxes. Each folded-web trough-shaped steel anchor box includes two folded web plates and two trough-shaped steel anchor boxes. The two ends of each folded web plate are connected to the two trough-shaped steel anchor boxes, forming a closed annular structure. The concrete tower walls include end tower walls and side tower walls, with the end tower walls spaced apart from the trough-shaped steel anchor boxes, and the side tower walls connected to the trough-shaped steel anchor boxes. The stay cables pass through the end tower walls and connect to the trough-shaped steel anchor boxes. Each trough-shaped steel anchor box includes an end plate and two side plates, with the two ends of the end plate connected to the two side plates to form a trough-shaped structure. The two ends of each folded web plate are connected to the side plates. The end plates are spaced apart from the end tower walls, and the side plates are connected to the side tower walls. Each trough-shaped steel anchor box is connected to two stay cables.

2. The composite cable tower anchoring structure of the folded-web grooved steel anchor box according to claim 1, characterized in that: The end plate has through holes for the stay cables to pass through.

3. The composite cable tower anchoring structure of the folded-web grooved steel anchor box according to claim 1, characterized in that: The channel-shaped steel anchor box also includes an anchor plate, a pressure plate, a support plate, and a seat plate; two support plates are provided and arranged vertically and parallel within the channel structure; the seat plate is connected to the side of the two support plates away from the end plate; the pressure plate is provided between the two support plates, with one end connected to the end plate and the other end connected to the seat plate; the anchor plate is provided on the seat plate, and the anchor plate is provided with an anchor head for the stay cable to pass through the seat plate and the anchor plate and then connect to the anchor head.

4. The composite cable tower anchoring structure of the folded-web grooved steel anchor box according to claim 3, characterized in that: The support plate is parallel to the stay cable.

5. The composite cable tower anchoring structure of the folded-web grooved steel anchor box according to claim 1, characterized in that: Several rows of welding studs are vertically arranged on the side plate, and the side plate is connected to the concrete tower wall by the welding studs; the welding studs are evenly distributed along the horizontal and vertical directions of the side plate.

6. The composite cable tower anchoring structure of the folded-web grooved steel anchor box according to claim 1, characterized in that: The end plate is perpendicularly connected to the two side plates.

7. A construction method for a combined cable tower anchoring structure with a folded-web groove-shaped steel anchor box, characterized in that: Includes the following steps: S1, Fabrication of channel steel anchor boxes; welding anchor plates, seat plates, and support plates into one piece; welding several bearing plates into the support plate, and welding the end plates, side plates, and support plates into a semi-closed box structure to form a channel steel anchor box; wherein, through holes are opened on the end plates, and several rows of welding studs are welded on the side plates; two channel steel anchor boxes are connected by a folded web plate, and the folded web plate is welded to the side plates of the two channel steel anchor boxes; S2, installation and splicing of folded-web trough steel anchor boxes; two trough steel anchor boxes are connected by folded web plates to form a single segment folded-web trough steel anchor box; each segment is hoisted and stacked one by one, and the end plates and side plates of the trough steel anchor box are connected by on-site welding or bolts between the upper and lower segments to form a whole; S3, Concrete tower wall pouring: Concrete is poured in sections from bottom to top using formwork to form the concrete tower wall; the concrete is poured outside the channel-shaped steel anchor box, and the end plate does not contact the concrete tower wall, but contacts the concrete tower wall through the side plate; S4, Cable tensioning and anchoring: The cable passes through the through hole on the end plate and is fixed to the anchor head, which is supported on the anchor plate to form an anchoring device.

Images