Construction method of full-bridge multi-angle space cable anchoring structure

Abstract

The application discloses a construction method of a full-bridge multi-angle space inhaul cable anchoring structure and belongs to the bridge field.The construction method comprises a plurality of anchoring monomer assemblies which are sequentially welded along a tower wall of a main tower.The steps are as follows: step 1, a three-dimensional model of a cable-stayed bridge tower anchoring structure is established;step 2, detailed geometric dimensions of an anchor pad, a pressure bearing plate, an anchor web plate, an anchor pipe and a stiffening plate which constitute the anchoring monomer assemblies are extracted according to the three-dimensional model, and the anchor pad, the pressure bearing plate, the anchor web plate, the anchor pipe and the stiffening plate are processed by cutting;step 3, the assembly and welding of the cable-stayed bridge tower anchoring structure is completed;and step 4, the installation work of the cable-stayed bridge tower anchoring structure is completed.The application simplifies a complex problem, that is, a multi-angle space positioning problem of inhaul cables entering the main tower, and the problem is realized by adjusting two-dimensional structure sizes of two anchor web plates, the cable force of the inhaul cables is directly transmitted to the tower wall through the two anchor web plates, the stress is clear, the two anchor web plates play the roles of adjusting the three-dimensional angle of the inhaul cables entering the main tower and transmitting the force and play the role of stiffening the tower wall of the main tower, anchoring space is saved, and engineering cost is saved.

Description

Technical Field

[0001] This invention belongs to the field of bridge technology, and in particular relates to a construction method for a multi-angle spatial cable anchorage structure for a whole bridge. Background Technology

[0002] Cable-stayed bridges mainly consist of main towers, cables, and main girders. They are a composite bridge system where the main girder is primarily subjected to axial force (dense cable system) or bending (sparse cable system), while the support system is primarily supported by tension in the cables and compression in the towers. The anchorage structure between the cables and the main tower is a key aspect of cable-stayed bridge design and construction. For conventional main tower cable-stayed bridges, common anchorage structures between the cables and the steel main tower include anchor beams and steel anchor boxes. The control and positioning of the anchor pipe in the anchorage structure are crucial, directly affecting the structural stress performance and cable durability.

[0003] This patent relates to a cable-stayed bridge with a single leaning tower. A schematic diagram of the bridge elevation is shown below. Figure 4 As shown, the main tower of this bridge is a steel inclined-curved tower, with 24 stay cables arranged radially in a double-plane configuration across the main span. Each cable enters the tower at a different angle. If a conventional anchor beam anchoring method is used, the steel anchor beams cannot achieve balanced stress because the number and position of the cables on the main span and side spans of this cable-stayed bridge are not one-to-one. From a structural stress perspective, this anchoring method is untenable. If a steel anchor box method is used, the angle of entry into the tower and the structural design of the steel anchor box at each cable are inconsistent, resulting in unclear force transmission, complex construction, and difficulty in implementation. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a simple anchorage structure and construction method for complex multi-angle spatial cables of a full bridge that can be achieved by solving a simple two-dimensional design problem.

[0005] This invention is implemented as follows: a construction method for a multi-angle spatial cable anchorage structure for a full-bridge cable stay. The multi-angle spatial cable anchorage structure includes several anchorage unit components welded sequentially along the main tower wall. Each anchorage unit component includes an anchor plate, a bearing plate welded to the anchor plate, and two parallel anchor webs welded to the bearing plate, perpendicular to the bearing plate. One side of each anchor web is welded to the main tower wall of the cable-stayed bridge. Stiffening plates are provided between the anchor webs. The anchor plate and the bearing plate... The center of the anchor pipe has a cable hole for installing the anchor pipe. The bottom of the anchor pipe is perpendicular to the anchor plate and connected to the cable hole of the anchor plate. The stay cable is inserted into the anchor pipe. The angle of the stay cable entering the tower is α, and the angle between the main tower contact surface of the anchor web and the bearing plate contact surface of the anchor web is β, where α and β are complementary angles. The anchor web of each anchoring structure is made separately according to the number of stay cables of the cable-stayed bridge. Based on the angle of the stay cable entering the tower, the geometric dimensions of the two identical anchor webs at each anchor point are determined. The specific manufacturing method is as follows: including the following steps:

[0006] Step 1: Establish a 3D model of the cable-stayed bridge tower anchorage structure. Specific steps include:

[0007] 1.1 By conducting stress analysis on the anchorage structure of the cable-stayed bridge tower, the geometric dimensions of the anchor plate, bearing plate, anchor web and stiffening plate of each anchorage structure are determined;

[0008] 1.2. Based on the three-dimensional coordinates of the main tower positioning point and the tower anchor point, lay out the relative positions of the anchor web and the main tower wall, then lay out the center line of the stay cable, and determine the angle β between the main tower contact surface and the bearing contact surface of the anchor web according to the tower entry angle α of the stay cable.

[0009] 1.3. Based on the dimensions of the anchor web and the relative positions of the anchor plate, bearing plate, stiffening plate and anchor web, lay out the anchor plate, bearing plate and stiffening plate in sequence to complete the three-dimensional model of the cable-stayed bridge tower anchorage structure.

[0010] Step 2: Extract the detailed geometric dimensions of the anchor plate, bearing plate, anchor web, anchor pipe and stiffening plate from the 3D model, and then cut and process them;

[0011] Step 3: Complete the assembly welding of the cable-stayed bridge tower anchorage structure: Specific steps include:

[0012] 3.1: Welded cable-stayed bridge tower anchorage structure: First, the anchor plate and the bearing plate are welded together. Then, several inner stiffening plates between the two anchor webs are welded to the bearing plate. Next, the two anchor webs are welded perpendicularly to the bearing plate and the inner stiffening plates. Finally, several outer stiffening plates are symmetrically welded to the outside of the anchor webs. The anchor plate, bearing plate, anchor webs and stiffening plates together constitute a stable tower anchorage structure.

[0013] 3.2: Assembled anchor pipe: The top inner side of the anchor pipe is provided with a welding bevel, and the top of the anchor pipe is aligned with the cable hole of the anchor plate and welded;

[0014] Step 4: Installation of the cable-stayed bridge tower anchorage structure: Install the cable-stayed bridge tower anchorage structure on the side wall of the main tower. Using a 3D model and 3D lofting, determine the relative positional relationship between the welded cable-stayed bridge tower anchorage structure and the main tower, and complete the welding and installation of the cable-stayed bridge tower anchorage structure and the main tower. Repeat the above steps to complete the welding and installation of all cable-stayed bridge tower anchorage structures and the main tower.

[0015] The present invention can also adopt the following technical solutions:

[0016] Preferably, the planar dimensions of the bearing plate are larger than those of the anchor plate.

[0017] Preferably, the bearing plate of the anchor web has an arc-shaped notch for transition.

[0018] Preferably, the stiffening plates are all welded to the anchor web and the bearing plate.

[0019] The advantages and technical effects of this invention are as follows: This invention provides a simple anchorage structure for multi-angle spatial cables across an entire bridge, solving problems such as inconsistent steel anchor box entry angles and structural configurations, unclear force transmission, complex construction, and difficulty in control, thus simplifying complex problems. The challenge of multi-angle spatial positioning of the cables entering the main tower is simply achieved by adjusting the two-dimensional structural dimensions of two anchor webs. The cable force is directly transmitted to the main tower wall through the anchor plate and bearing plate, ensuring clear force distribution. The two anchor webs not only adjust the three-dimensional angle of the cables entering the main tower and the force transmission, but also reinforce the main tower wall, saving anchorage space and reducing project costs. It effectively solves the stress and structural problems of multi-angle spatial cables, significantly improving the control accuracy and construction efficiency of the tower anchorage structure. The structure is simple, and the force transmission is clear.

[0020] In addition, for structures where the main tower is curved or otherwise non-linear, the edge line of the anchor web plate that connects with the tower wall should be consistent with the curve of the main tower wall to ensure that the anchor web plate and the main tower wall fit tightly together.

[0021] Secondly, this involves fabricating a separate anchorage structure for each anchorage point. To facilitate construction and improve the efficiency of fabrication and installation of the pylon anchorage structure for this cable-stayed bridge, the individual anchor webs of adjacent anchorage points can be connected to create a shared anchor web for the pylon anchorage structure of adjacent anchorage points. This allows for the overall welding and installation of the pylon anchorage structure with the shared anchor web for adjacent anchorage points, reducing on-site construction procedures, improving fabrication precision, and enhancing project quality. Attached Figure Description

[0022] Figure 1 and Figure 2 This is a schematic diagram of the anchoring unit component structure;

[0023] Figure 3 This is a schematic diagram of a shared anchor web structure;

[0024] Figure 4 This is a schematic diagram of the entire structure of a single-tower cable-stayed bridge, an application engineering case study.

[0025] In the diagram: 1. Anchor plate; 2. Bearing plate; 3. Anchor web; 4. Stiffening plate; 5. Anchor pipe; 6. Main tower; 7. Back cable; 8. Stay cable; 9. Main beam. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figure 4 As shown, a construction method for a multi-angle spatial cable anchorage structure for a full-bridge is described. The multi-angle spatial cable anchorage structure for a full-bridge includes several anchorage unit components welded sequentially along the tower wall of the main tower 6. Figure 4 This patent provides only one case study of a real bridge project where the multi-angle spatial cables of this bridge share a simple anchorage structure. The application scenarios of this patent include, but are not limited to, this type of bridge project.

[0028] Please see Figures 1 to 3 The anchoring unit includes an anchor plate 1, a bearing plate 2 welded to the anchor plate, and two parallel anchor webs 3 welded to the bearing plate near the main tower wall. One side of the anchor webs is welded to the main tower wall of the cable-stayed bridge. A stiffening plate 4 is provided between the anchor webs. The center of the anchor plate and the bearing plate is provided with a cable hole for installing the anchor pipe 5. The bottom of the anchor pipe is perpendicular to the anchor plate, and a cable stay 8 is inserted into the anchor pipe. The angle of the cable stay entering the tower is α, and the angle between the main tower contact surface of the anchor web and the bearing plate contact surface of the anchor web is β, that is, the angle between side AB and side BC is β, and α and β are complementary angles. The spatial positioning of the tower anchoring structure and the angle of entry into the tower α are adjusted by the plane dimensions of the anchor web and the angle β between the bearing plate contact side BC of the anchor web and the outer side AB (or tangent) of the main tower wall.

[0029] Each anchorage web is fabricated individually based on the number of stay cables in the cable-stayed bridge. The geometric dimensions of the two identical anchor webs at each anchorage point are determined according to the cable's entry angle into the tower. The specific fabrication method is as follows:

[0030] Step 1: Establish a 3D model of the cable-stayed bridge tower anchorage structure. Specific steps include:

[0031] 1.1 By conducting stress analysis on the anchorage structure of the cable-stayed bridge tower, the geometric dimensions of the anchor plate, bearing plate, anchor web and stiffening plate of each anchorage structure are determined;

[0032] 1.2. Based on the three-dimensional coordinates of the main tower positioning point and the tower anchor point, lay out the relative positions of the anchor web and the main tower wall, then lay out the center line of the stay cable, and determine the angle β between the main tower contact surface and the bearing contact surface of the anchor web according to the tower entry angle α of the stay cable.

[0033] 1.3. Based on the dimensions of the anchor web and the relative positions of the anchor plate, bearing plate, stiffening plate and anchor web, lay out the anchor plate, bearing plate and stiffening plate in sequence to complete the three-dimensional model of the cable-stayed bridge tower anchorage structure.

[0034] Step 2: Extract the detailed geometric dimensions of the anchor plate, bearing plate, anchor web, anchor pipe and stiffening plate from the 3D model, and then cut and process them;

[0035] Step 3: Complete the assembly welding of the cable-stayed bridge tower anchorage structure: Specific steps include:

[0036] 3.1: Welded cable-stayed bridge tower anchorage structure: First, the anchor plate and the bearing plate are welded together. Then, several inner stiffening plates between the two anchor webs are welded to the bearing plate. Next, the two anchor webs are welded perpendicularly to the bearing plate and the inner stiffening plates. Finally, several outer stiffening plates are symmetrically welded to the outside of the anchor webs. The anchor plate, bearing plate, anchor webs and stiffening plates together constitute a stable tower anchorage structure.

[0037] 3.2: Assembled anchor pipe: The top inner side of the anchor pipe is provided with a welding bevel, and the top of the anchor pipe is aligned with the cable hole of the anchor plate and welded;

[0038] Step 4: Installation of the cable-stayed bridge tower anchorage structure: Install the cable-stayed bridge tower anchorage structure on the side wall of the main tower. Using a 3D model and 3D lofting, determine the relative positional relationship between the welded cable-stayed bridge tower anchorage structure and the main tower, and complete the welding and installation of the cable-stayed bridge tower anchorage structure and the main tower. Repeat the above steps to complete the welding and installation of all cable-stayed bridge tower anchorage structures and the main tower.

[0039] The present invention can also adopt the following technical solutions:

[0040] Preferably, the planar dimensions of the bearing plate are larger than those of the anchor plate to ensure an effective contact area.

[0041] Preferably, the bearing plate of the anchor web is provided with an arc-shaped notch transition on the mating surface to prevent stress concentration.

[0042] Preferably, the stiffening plates are welded to the anchor web and the bearing plate to improve the load-bearing strength. The number, thickness, size and arrangement of the stiffening plates are designed according to the stress and structural requirements of the anchoring structure.

[0043] Example 2: To facilitate construction and improve the efficiency of fabrication and installation of the cable-stayed bridge's tower anchorage structure, the individual anchor webs of adjacent anchor points can be connected to create a shared anchor web for the tower anchorage structure of adjacent anchor points. This allows for the overall welding and installation of the tower anchorage structure with the shared anchor web for adjacent anchor points. The construction method is similar to that of the separate anchorage structure for multi-angle spatial cable-stayed towers described above, except that after installing the anchorage structure (e.g., 3 or 4) of the shared anchor web for a whole segment of the multi-angle spatial cable-stayed tower, the entire structure is connected to the main tower wall. In actual steel plate processing at the steel plate factory, based on the structural stress and the segment division of the main steel tower, the anchor webs of all individual new anchorage structures on one side of the main steel tower within a segment are sequentially welded into a single integrated anchor web according to their adjacent relationships and then welded to the tower wall. This reduces on-site construction procedures, improves fabrication accuracy, enhances project quality, and ultimately forms a simple shared anchorage structure for multi-angle spatial cables across the entire bridge.

[0044] Please see Figure 3 In the diagram, a, b, and c represent the anchorage structures of three adjacent anchor points, and a-3, b-3, and c-3 represent the anchor webs of these three adjacent anchorage structures. Considering structural stress and ease of construction, the individual anchor webs at adjacent anchor points are optimized and rationally connected to form a cable-stayed bridge tower anchorage structure with shared anchor webs at adjacent anchor points. The number and division of the shared anchor webs at adjacent anchor points can be rationally optimized and designed based on the segment division of the main tower and ease of construction. Figure 3 This example illustrates the anchoring structure of a cable tower where three adjacent anchor points share a common anchor web.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for a multi-angle spatial cable anchorage structure for a full-bridge, characterized in that: The multi-angle spatial cable anchorage structure of the entire bridge includes several anchorage unit components welded sequentially along the main tower wall. Each anchorage unit component includes an anchor plate, a bearing plate welded to the anchor plate, and two parallel anchor webs welded to the bearing plate near the main tower wall. One side of each anchor web is welded to the main tower wall of the cable-stayed bridge. Stiffening plates are provided between the anchor webs. Cable holes for installing anchor pipes are located at the center of the anchor plate and the bearing plate. The bottom of the anchor pipe is perpendicular to the anchor plate and connected to the cable hole in the anchor plate. A cable is inserted into the anchor pipe. The angle of entry of the cable into the tower is α, and the angle between the main tower contact surface of the anchor web and the bearing plate contact surface of the anchor web is β, where α and β are complementary angles. Anchor webs for each anchorage structure are fabricated individually according to the number of cables in the cable-stayed bridge. Based on the angle of entry of the cable into the tower, the geometric dimensions of two identical anchor webs at each anchor point are determined. The specific fabrication method includes the following steps: Step 1: Establish a 3D model of the cable-stayed bridge tower anchorage structure. Specific steps include: 1.1 By conducting stress analysis on the anchorage structure of the cable-stayed bridge tower, the geometric dimensions of the anchor plate, bearing plate, anchor web and stiffening plate of each anchorage structure are determined; 1.

2. Based on the three-dimensional coordinates of the main tower positioning point and the tower anchor point, lay out the relative positions of the anchor web and the main tower wall, then lay out the center line of the stay cable, and determine the angle β between the main tower contact surface and the bearing contact surface of the anchor web according to the tower entry angle α of the stay cable. 1.

3. Based on the dimensions of the anchor web and the relative positions of the anchor plate, bearing plate, stiffening plate and anchor web, lay out the anchor plate, bearing plate and stiffening plate in sequence to complete the three-dimensional model of the cable-stayed bridge tower anchorage structure. Step 2: Extract the detailed geometric dimensions of the anchor plate, bearing plate, anchor web, anchor pipe and stiffening plate from the 3D model, and then cut and process them; Step 3: Complete the assembly welding of the cable-stayed bridge tower anchorage structure: Specific steps include: 3.1: Welded cable-stayed bridge tower anchorage structure: First, the anchor plate and the bearing plate are welded together. Then, several inner stiffening plates between the two anchor webs are welded to the bearing plate. Next, the two anchor webs are welded perpendicularly to the bearing plate and the inner stiffening plates. Finally, several outer stiffening plates are symmetrically welded to the outside of the anchor webs. The anchor plate, bearing plate, anchor webs and stiffening plates together constitute a stable tower anchorage structure. 3.2: Assembled anchor pipe: The top inner side of the anchor pipe is provided with a welding bevel, and the top of the anchor pipe is aligned with the cable hole of the anchor plate and welded; Step 4: Installation of the cable-stayed bridge tower anchorage structure: Install the cable-stayed bridge tower anchorage structure on the side wall of the main tower. Using a 3D model and 3D lofting, determine the relative positional relationship between the welded cable-stayed bridge tower anchorage structure and the main tower, and complete the welding and installation of the cable-stayed bridge tower anchorage structure and the main tower. Repeat the above steps to complete the welding and installation of all cable-stayed bridge tower anchorage structures and the main tower.

2. The construction method of the multi-angle spatial cable anchorage structure for the entire bridge according to claim 1, characterized in that: The planar dimensions of the bearing plate are larger than those of the anchor plate.

3. The construction method of the multi-angle spatial cable anchorage structure for the entire bridge according to claim 1, characterized in that: The anchor web has an arc-shaped notch on its bearing plate mating surface for transition.

4. The construction method of the multi-angle spatial cable anchorage structure for the entire bridge according to claim 1, characterized in that: The stiffening plates are all welded to the anchor web and the bearing plate.

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