A method for calculating and arranging the optimal amount of back cables in a cable-stayed buckle system

Abstract

The present invention discloses a method for calculating and arranging the optimal amount of back cables for a cable-stayed buckle system, which belongs to the technical field of bridges. The cable-stayed buckle system includes a buckle tower, a buckle cable, a back cable, a steel anchor beam, and an anchor foundation. The steel anchor beam is arranged on the buckle tower, and the two ends of the buckle cable are respectively connected to the arch rib and the steel anchor beam. The two ends of the back cable are respectively connected to the steel anchor beam and the anchor foundation arranged on the ground. The calculation and arrangement method includes the following steps: S1, designing and determining the position, height, and structural form of the buckle tower; S2, designing and determining the number of layers and positions of the steel anchor beam; S3, designing and determining the connection position between the buckle cable and the arch rib; S4, calculating the buckle cable force; S5, calculating the horizontal tension of the steel anchor beam; S6, calculating the back cable force at any horizontal angle; S7, establishing and solving the optimal formula for the back cable length. This technical solution reduces the amount of back cables (steel strands) used and saves construction costs by studying the optimal arrangement of the back cables of the cable-stayed buckle system.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridges, and in particular relates to a method for calculating and arranging the optimal amount of back cables of a cable-stayed buckle system. Background Art

[0002] Cable hoisting combined with cable-stayed and cable-stayed hooking is the predominant construction method for long-span arch bridges. The rationality and safety of the cable-stayed and cable-stayed hooking system directly impact the linear accuracy of the arch ribs and construction costs. Currently, the spans of arch bridges under construction have exceeded 600 meters. The larger the span, the taller and more rigid the cable-stayed and cable-stayed hooking system's hook towers are required, increasing construction costs exponentially. Existing standards and literature state that, considering both construction costs and the difficulty of linear arch rib control, the minimum horizontal angle between the cable and the arch rib in the hook-and-hook system should not be less than 8°. However, no literature or standards address the control of the angle between the back cable and the anchor foundation. The back cable is a crucial mechanism for balancing the vertical force of the back cable and the horizontal force of the cable. The rational design and layout of the back cable is crucial for ensuring the safety of cable-stayed and cable-stayed system construction and reducing construction costs. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for calculating and arranging the optimal amount of back cables of a cable-stayed buckle system. By studying the optimized arrangement of the back cables of the cable-stayed buckle system, the amount of unnecessary back cables (steel strands) used during the construction process can be reduced, further saving the construction cost of arch bridge construction.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses a method for calculating and arranging the optimal amount of back cables for an oblique-stayed buckle-hanging system. The oblique-stayed buckle-hanging system includes a buckle tower, a buckle cable, a back cable, a steel anchor beam, and an anchor foundation. The steel anchor beam is disposed on the buckle tower. The ends of the buckle cable are respectively connected to the arch rib and the steel anchor beam, providing a balanced vertical force for the arch rib installation that satisfies the linearity of the main arch installation. The cable force of the buckle cable is transmitted to the buckle tower via the steel anchor beam. The ends of the back cable are respectively connected to the steel anchor beam and an anchor foundation disposed on the ground, providing the buckle tower with a vertical force to maintain structural stability.

[0006] The calculation and arrangement method includes the following steps:

[0007] S1. Design and determine the location, height and structural form of the tower;

[0008] S2. Design and determine the number and location of steel anchor beams;

[0009] S3. Design and determine the connection position between the cable and the arch rib;

[0010] S4. Calculate the cable force;

[0011] S5. Calculate the horizontal tension of the steel anchor beam;

[0012] S6. Calculate the back cable force at any horizontal angle;

[0013] S7. Establish the optimal formula for the back cable length and solve it.

[0014] Furthermore, the calculation and arrangement method is specifically as follows:

[0015] In the cable-stayed buckle system, the design height of the buckle tower is H, and m buckle cables and n back cables are arranged. The cable forces of the i-th buckle cable and back cable are f ki 、f bi The lengths of the i-th buckle and back rope are l ki 、l bi The horizontal angles between the i-th buckle cable, back cable and the horizontal plane are α i , β i , where the cable force f ki Angle α with the horizontal i are known parameters;

[0016] The steel anchor beams and back cables are usually designed in a one-to-one correspondence, so the horizontal force f of the steel anchor beam at layer i is mi It can be obtained from the cable force, then Σ(f ki ×cosα i ) = f mi = f bi ×cosβ i ;

[0017] Assume that the height difference between the anchor point of the tower of the i-th back cable and the ground anchor point is h i , then the length of the i-th back cable is l bi =h i / sinβ i ;

[0018] Assuming that the design breaking force of a single steel strand is f0, the total length of the i-th back cable steel strand is: L bi = f bi / f0×l bi = f mi / cosβ i / f0×h i / sinβ i =2f mi ×h i / sin2β i / f0;

[0019] Because f mi 、h i are all known numbers, then when sin2β i =1 takes the maximum value, the total length of the back cable steel strand L biMinimum, solve for β i =45°.

[0020] Furthermore, the anchor foundation includes a plurality of anchor rods, one end of the plurality of anchor rods is set under the ground, the other end of the plurality of anchor rods is provided with an anchor box, the anchor box is fixed to the other end of the plurality of anchor rods, the upper surface of the anchor box is set flush with the ground, the interior of the anchor box is hollow, and the upper surface of the anchor box is provided with a slideway set through, the interior of the anchor box is symmetrically provided with sliding rods on both sides along the length direction, the two ends of the sliding rod are respectively fixedly connected to the inner side surfaces of the two end portions of the anchor box, the sliding rod is provided with a plurality of sliders, the two ends of the sliders are slidably sleeved It is arranged on the sliding rod, and a screw is provided in the middle of the slider, and the slider is slidably connected to the screw. Locking nuts are provided at both ends of the slider, and the locking nuts are threadedly connected to the screw. Fixed plates are symmetrically provided in the length direction of the slider, one end of the fixed plate is fixed to the slider, and the other end of the fixed plate is provided with a U-shaped connecting frame, and the open ends of the U-shaped connecting frame are respectively rotatably connected to the other ends of the two fixed plates, and the other end of the U-shaped mounting frame is provided with an anchor cup, which anchors one end of the back rope to the U-shaped mounting frame.

[0021] Furthermore, a rotating shaft is provided on the other end of the fixing plate, and the rotating shaft rotatably connects the open end of the U-shaped connecting frame to the fixing plate.

[0022] Furthermore, the U-shaped connecting frame includes side panels symmetrically arranged on both sides, one end of the side panel is rotatably connected to the fixed plate, and the other end of the side panel is provided with a rotating column, and both ends of the rotating column are rotatably connected to the other end of the side panel respectively, and a rope hole is provided in the middle of the rotating column, and the back rope passes through the rope hole and is connected to the anchor cup, and support columns are provided on the outer sides of the side panels, and the support columns are arranged perpendicular to the side panels, one end of the support column is fixed to the side panel, and the other end of the support column is provided with a support rib, one end of the support rib is rotatably connected to the support column, and the other end of the support rib is connected to the upper surface edge of the anchor box.

[0023] Furthermore, a groove is provided on the upper surface of the anchor box, and the groove is arranged along the length direction of the anchor box. The other end of the support rib is slidingly contacted in the groove. A number of evenly arranged card grooves are provided in the length direction of the groove, and the card grooves are arranged perpendicular to the grooves. A card block is provided in the card groove to block and limit the end of the support rib.

[0024] Furthermore, after the angle of the back rope is adjusted to a specified size, the other end of the support rib is welded and fixed to the anchor box.

[0025] The beneficial effects of the present invention are:

[0026] (1) The method part of this technical solution proves that when the back cable is arranged at an inclination angle of 45° to the horizontal line, the back cable can achieve the minimum design amount, that is, while ensuring the structural stability of the inclined buckle system, the construction cost is effectively reduced;

[0027] (2) The structural part of the anchoring foundation in this technical solution can adjust the anchoring angle of the back cable to ensure the accuracy of the back cable installation angle, that is, the use of the method part can further reduce the construction cost.

[0028] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0030] Figure 1 Schematic diagram of the process of the present invention;

[0031] Figure 2 It is a plan view of the mouth hanging system of the present invention;

[0032] Figure 3 It is a three-dimensional schematic diagram of the connection between the anchor foundation and the back cable in the present invention;

[0033] Figure 4 It is a schematic cross-sectional view of the connection between the anchor foundation and the back cable in the present invention;

[0034] Figure 5 It is a schematic internal perspective view of the anchor foundation of the present invention;

[0035] Figure 6 A three-dimensional schematic diagram of another perspective of the anchor foundation of the present invention;

[0036] Figure 7 It is a partial schematic diagram of the connection between the rotating column, the slider and the side plate in the anchor foundation of the present invention.

[0037] The following are marked in the accompanying drawings:

[0038] 1. Clamp tower; 2. Clamp cable; 3. Arch rib; 4. Steel anchor beam; 5. Back cable; 6. Anchor foundation; 610. Anchor rod; 611. Anchor box; 612. Slide; 613. Slide rod; 614. Slider; 615. Screw; 616. Lock nut; 617. Fixing plate; 618. Rotating shaft; 619. Side plate; 620. Rotating column; 621. Cable hole; 622. Support column; 623. Support rib; 624. Block; 625. Slot; 626. Anchor cup. DETAILED DESCRIPTION

[0039] like Figures 1 to 7 As shown in the figure, the present invention provides a simple calculation method for optimizing the arrangement of the back cables in the inclined buckle hanging system, and the implementation steps are as follows:

[0040] S1. Design and determine the position, height and structural form of the buckle tower 1;

[0041] S2. Design and determine the number of layers and positions of steel anchor beams 4;

[0042] S3. Design and determine the connection position between the cable 2 and the arch rib 3;

[0043] S4. Calculate the cable force of cable 2;

[0044] S5. Calculate the horizontal tension of steel anchor beam 4;

[0045] S6. Calculate the back cable force at any horizontal angle;

[0046] S1. Establish the optimal formula for the length of the back cable 55 and solve it.

[0047] In the above scheme, the known inclined-stayed buckle system mainly consists of a buckle tower 1, a buckle cable 2, a steel anchor beam 4, a back cable 5, and an anchor foundation 6. The buckle cable 2 is connected to the arch rib 3 and the buckle tower 1, providing a balanced vertical force that satisfies the linearity of the main arch for the installation of the arch rib 3. The cable force of the buckle cable 2 is transmitted to the buckle tower 1, which is mainly subjected to compression and bending. The back cable 5 is connected to the buckle tower 1 and the ground anchor foundation 6, providing the buckle tower 1 with horizontal and vertical forces to maintain structural stability and vertical verticality. In the design of the inclined-stayed buckle system, one layer of steel anchor beam 4 often corresponds to one or more pairs of buckle cables 2 and one pair of back cables 5. Under ideal conditions, the tower deflection of the buckle tower 1 is zero, and the horizontal force components transmitted to the steel anchor beam 4 by the buckle cables 2 and back cables 5 are equal.

[0048] In the above scheme, the design height of the cable tower 1 in the cable-stayed cable system is H, and m cable cables 2 and n back cables 5 are arranged. The cable forces of the i-th cable cable 2 and back cables 5 are f ki 、f bi The lengths of the i-th buckle cable 2 and back cable 5 are l ki 、l bi The horizontal angles between the i-th cable 2 and the back cable 5 and the horizontal plane are α i , βi .

[0049] In the above scheme, it is known that the cable force f ki Angle α with the horizontal i , then the horizontal force f of the 4th steel anchor beam of the i-th layer mi It can be obtained from the corresponding cable force of the cable 2. The steel anchor beam 4 and the back cable 5 are often designed in a one-to-one correspondence, so Σ(f ki ×cosα i ) = f mi = f bi ×cosβ i .

[0050] In the above scheme, it is assumed that the height difference between the anchor point of the buckle tower 11 of the first back cable 5 and the ground anchor point is h i , then the length of the i-th back cable 5 is l bi =h i / sinβ i .

[0051] In the above scheme, assuming that the design breaking force of a single steel strand is f0, the total length of the 5 steel strands of the i-th back cable is: L bi = f bi / f0×l bi = f mi / cosβ i / f0×h i / sinβ i =2f mi ×h i / sin2β i / f0;f mi 、h i are all known numbers, then when sin2β i =1 takes the maximum value, the total length (amount) of the back rope 5 steel strands L bi The minimum is obtained, and βi=45°.

[0052] The following compares the proportional coefficients of the material usage of the back rope 5 when the horizontal angle between the back rope 5 and the ground is 45°.

[0053]

[0054] The above data show that when the horizontal angle of the back rope 5 is 45°, the amount of back rope 5 material is the least. As the difference between the horizontal angle and 45° increases, the amount of back rope 5 material increases, and it shows an exponential growth.

[0055] This method proves the calculation and arrangement position of the minimum design amount of the back cable 5, effectively reducing the construction cost while ensuring the structural stability of the inclined buckle system.

[0056] Since one end of the back cable 5 is connected to the steel anchor beam 4 (this end is located at the upper end of the buckle tower 1, which is convenient for adjusting the angle of the back cable 5), it can be connected by a hanging ring or the like, and the other end is connected to the anchoring foundation 6. However, during the anchoring and tensioning process of the back cable 5, the anchoring foundation 6 in the prior art cannot adjust the anchoring angle of the back cable 5, resulting in a fixed anchoring angle of the back cable 5 (determined by the angle between the anchoring foundation 6 and the connection position of the back cable 5). If there is an error in the construction of the anchoring foundation 6, it will be difficult to ensure that the back cable 5 is at the most suitable installation angle, resulting in the problem that both the amount and the force of the back cable 5 are affected.

[0057] Therefore, an anchoring foundation 6 is also proposed in the present technical solution. Specifically, the anchoring foundation 6 includes a plurality of anchor rods 610, one end of each of the anchor rods 610 is anchored under the ground, and an anchor box 611 is provided on the other end of each of the anchor rods 610. The anchor box 611 is welded and fixed to the other end of each of the anchor rods 610. The upper surface of the anchor box 611 is flush with the ground. The interior of the anchor box 611 is hollow, and a slideway 612 is provided through the middle of the upper surface of the anchor box 611. Slide rods 613 are symmetrically provided on both sides of the length direction of the interior of the anchor box 611. The two ends of the slide rod 613 are respectively fixedly connected to the inner side surfaces of the two end portions of the anchor box 611. A plurality of sliders 614 are provided on the slide rod 613. The two ends of the slider 614 The sliding sleeve is set on the sliding rod 613, and a screw 615 is provided in the middle of the slider 614. The slider 614 is slidably connected to the screw 615. Locking nuts 616 are provided at both ends of the slider 614. The locking nuts 616 are threadedly connected to the screw 615. Fixed plates 617 are symmetrically provided in the length direction of the slider 614. One end of the fixed plate 617 is fixed to the slider 614, and the other end of the fixed plate 617 is provided with a U-shaped connecting frame. The open ends of the U-shaped connecting frame are respectively rotatably connected to the other ends of the two fixed plates 617. The other end of the U-shaped mounting frame is provided with an anchor cup 626. The anchor cup 626 is a prior art and will not be described in detail here. The anchor cup 626 anchors one end of the shoulder rope 5 to the U-shaped mounting frame.

[0058] The working principle of the above technical solution is:

[0059] When the back cable 5 is installed, its two ends are first connected to the steel anchor beam 4 and the U-shaped connecting frame respectively, and then the end of the back cable 5 is pulled by the hydraulic device to tension it. During the tensioning process, if there is an installation deviation between the angle of the back cable 5 and the horizontal line, it is only necessary to adjust the position of the slider 614 relative to the screw 615 to adjust the tensioning angle of the back cable 5 to meet the design requirements. For example, the angle between the back cable 5 and the horizontal line obtained in the method is 45°. After the position of the slider 614 is adjusted into place, it only needs to be locked by the locking nut 616. It is not difficult to understand that the nut and the slide rod 613 should be made of high-strength steel to meet the anchoring force requirements.

[0060] It is not difficult to understand that when the slider 614 moves closer to the buckle tower 1, the β angle in the present technical solution increases, and when it moves away from the buckle tower 1, the β angle decreases, thereby enabling the adjustment of the anchoring angle of the back rope 5. At the same time, the U-shaped connecting frame is rotatably connected to the fixed plate 617, that is, the end of the back rope 5 can be rotated, which can always keep the end of the back rope 5 and the main body in a straight line, thereby improving the force effect.

[0061] In one practicable manner, a rotating shaft 618 is provided on the other end of the fixing plate 617 , and the rotating shaft 618 rotatably connects the open end of the U-shaped connecting frame to the fixing plate 617 .

[0062] In one practicable embodiment, the U-shaped connecting frame includes side panels 619 symmetrically arranged on both sides, one end of the side panel 619 is rotatably connected to the fixed plate 617, and a rotating column 620 is provided on the other end of the side panel 619. The two ends of the rotating column 620 are respectively rotatably connected to the other end of the side panel 619. A rope hole 621 is provided in the middle of the rotating column 620, and the back rope 5 passes through the rope hole 621 and is connected to the anchor cup 626. Support columns 622 are provided on the outer surfaces of the side panels 619. The support columns 622 are arranged perpendicular to the side panels 619, one end of the support columns 622 is fixed to the side panels 619, and a support rib 623 is provided on the other end of the support column 622. One end of the support rib 623 is rotatably connected to the support column 622, and the other end of the support rib 623 is connected to the upper surface edge of the anchor box.

[0063] It is not difficult to understand that the setting of several sliders 614 has a limited sliding distance of the slider 614 on the slide rod 613, so the anchor base 6 cannot be set too large. Then, if the sliding distance of the slider 614 moves to the limit, the angle of the back rope 5 has not been adjusted to the desired position. Then, by adjusting the position of the end of the support rib 623 on the anchor box 611, the inclination angle of the U-shaped connecting frame can be changed, and the angle of the back rope 5 can be adjusted. Similarly, the setting of the rotating column 620 is also to ensure that the back rope 5 is in a straight line after being straightened as a whole, to avoid its end rotating with the rotation of the U-shaped connecting frame, causing the end of the back rope 5 to bend, resulting in stress concentration, and affecting the force-bearing performance of the back rope 5.

[0064] In one feasible embodiment, a groove is provided on the upper surface of the anchor box, and the groove is arranged along the length direction of the anchor box. The other end of the support rib 623 is slidingly contacted in the groove, and a number of evenly arranged card grooves 625 are provided in the length direction of the groove. The card groove 625 is arranged perpendicular to the groove, and a card block 624 is provided in the card groove 625 to block and limit the end of the support rib 623.

[0065] The grooves limit the lateral displacement of the support ribs 623 to ensure the movement guidance and stability of the support ribs 623. At the same time, the clamping plate can block the ends of the adjusted support ribs 623 to avoid displacement during tensioning. This setting method can adjust the position of the support ribs 623 multiple times during the tensioning process, and thus accurately adjust the angle of the back rope 5 multiple times.

[0066] In one feasible method, after the angle of the back rope 5 is adjusted to a specified size, the other end of the support rib 623 is welded and fixed to the anchor box. After the angle is adjusted to the right position, it is fixed by welding to ensure stability during connection and use.

[0067] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for calculating and arranging the optimal amount of back cables for a slant stay buckle system, characterized by: The inclined-stayed buckle system comprises a buckle tower (1), a buckle cable (2), a back cable (5), a steel anchor beam (4) and an anchor foundation (6), wherein the steel anchor beam (4) is arranged on the buckle tower (1), and the two ends of the buckle cable (2) are respectively connected to the arch rib (3) and the steel anchor beam (4), providing a balanced vertical force that satisfies the linearity of the main arch installation for the installation of the arch rib (3), and the cable force of the buckle cable (2) is transmitted to the buckle tower (1) through the steel anchor beam (4), and the two ends of the back cable (5) are respectively connected to the steel anchor beam (4) and the anchor foundation (6) arranged on the ground, providing the buckle tower (1) with a vertical force to maintain structural stability; The calculation and arrangement method includes the following steps: S1. Design and determine the position, height and structural form of the buckle tower (1); S2. Design and determine the number and location of steel anchor beams (4); S3. Design and determine the connection position between the cable (2) and the arch rib (3); S4. Calculate the cable force (2); S5. Calculate the horizontal tension of the steel anchor beam (4); S6. Calculate the back cable (5) force at any horizontal angle; S7, establish the optimal length formula of the back cable (5) and solve it; The anchoring foundation (6) includes a plurality of anchor rods (610), one end of each of the anchor rods (610) is arranged under the ground, and an anchor box (611) is provided on the other end of each of the anchor rods (610). The anchor box (611) is fixed to the other end of each of the anchor rods (610). The upper surface of the anchor box (611) is flush with the ground. The interior of the anchor box (611) is hollow, and a slideway (612) is provided on the upper surface of the anchor box (611). Slide rods (613) are symmetrically provided on both sides along the length direction of the interior of the anchor box (611). The two ends of the slide rod (613) are respectively fixedly connected to the inner side surfaces of the two ends of the anchor box (611). The slide rod (613) is provided with a plurality of sliders (614), and the two ends of the slider (614) are slidably sleeved. On the slide bar (613), a screw rod (615) is provided in the middle of the slider (614), and the slider (614) is slidably connected to the screw rod (615). Locking nuts (616) are provided at both ends of the slider (614), and the locking nuts (616) are threadedly connected to the screw rod (615). The slider (614) is symmetrically provided with fixed plates (617) in the length direction, and one end of the fixed plate (617) is fixed to the slider (614). The other end of the fixed plate (617) is provided with a U-shaped connecting frame, and the open ends of the U-shaped connecting frame are respectively rotatably connected to the other ends of the two fixed plates (617). The other end of the U-shaped mounting frame is provided with an anchor cup (626), and the anchor cup (626) anchors one end of the back rope (5) to the U-shaped mounting frame.

2. The method for calculating and arranging the optimal amount of back cables for a slant stay buckle system according to claim 1, characterized in that: The calculation and arrangement method is specifically as follows: In the cable-stayed buckle system, the buckle tower (1) is designed to have a height of H, and m buckle cables (2) and n back cables (5) are arranged. The cable forces of the i-th buckle cable (2) and back cable (5) are f ki 、f bi , the lengths of the i-th buckle cable (2) and back cable (5) are l ki 、l bi The horizontal angles between the i-th buckle cable (2) and the back cable (5) and the horizontal plane are α i , β i , where the cable force (2) is f ki Angle α with the horizontal i are known parameters; The steel anchor beam (4) and the back cable (5) are usually designed in a one-to-one correspondence. Then the horizontal force f of the steel anchor beam (4) at the i-th layer is mi It can be obtained from the cable force (2), then Σ(f ki ×cosα i ) = f mi = f bi ×cosβ i ; Assume that the height difference between the anchor point of the tower (1) of the i-th back cable (5) and the ground anchor point is h i , then the length of the i-th back rope (5) is l bi =h i / sinβ i ; Assuming that the design breaking force of a single steel strand is f0, the total length of the steel strand used in the i-th back cable (5) is: L bi = f bi / f0×l bi = f mi / cosβ i / f0×h i / sinβ i =2f mi ×h i / sin2β i / f0; Because f mi 、h i are all known numbers, then when sin2β i =1 takes the maximum value, the total length of the back cable (5) steel strand L bi Minimum, solve for β i =45°.

3. The method for calculating and arranging the optimal amount of back cables for a slant stay buckle system according to claim 1 is characterized by: A rotating shaft (618) is provided on the other end of the fixed plate (617), and the rotating shaft (618) rotatably connects the open end of the U-shaped connecting frame to the fixed plate (617).

4. The method for calculating and arranging the optimal amount of back cables for a slant stay buckle system according to claim 1 is characterized by: The U-shaped connecting frame includes side plates (619) symmetrically arranged on both sides, one end of the side plate (619) is rotatably connected to the fixed plate (617), and a rotating column (620) is provided on the other end of the side plate (619), and both ends of the rotating column (620) are respectively rotatably connected to the other end of the side plate (619), and a rope hole (621) is provided in the middle of the rotating column (620), and the back rope (5) passes through the rope hole (621) and is connected to the anchor cup (626), and support columns (622) are provided on the outer surface of each side plate (619), and the support columns (622) are arranged perpendicular to the side plates (619), one end of the support columns (622) is fixed to the side plates (619), and a support rib (623) is provided on the other end of the support column (622), one end of the support rib (623) is rotatably connected to the support column (622), and the other end of the support rib (623) is connected to the upper surface edge of the anchor box.

5. The method for calculating and arranging the optimal amount of back cables for a slant stay buckle system according to claim 4 is characterized in that: A groove is provided on the upper surface of the anchor box, and the groove is arranged along the length direction of the anchor box. The other end of the support rib (623) is arranged in sliding contact in the groove. A plurality of evenly arranged card grooves (625) are provided in the length direction of the groove. The card groove (625) is arranged perpendicular to the groove. A card block (624) is provided in the card groove (625) for blocking and limiting the end of the support rib (623).

6. The method for calculating and arranging the optimal amount of back cables for a slant stay buckle system according to claim 5, characterized in that: When the angle of the back rope (5) is adjusted to a specified size, the other end of the support rib (623) is welded and fixed to the anchor box.

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