Method for calculating and arranging optimal quantity of back cables of cable-stayed buckling system

Abstract

The invention discloses an optimal quantity calculation and arrangement method for back cables of a cable-stayed buckling system, and belongs to the technical field of bridges. Comprising a buckling tower, a buckling cable, a back cable, a steel anchor beam and an anchoring foundation, the steel anchor beam is arranged on the buckling tower, the two ends of the buckling cable are connected with an arch rib and the steel anchor beam respectively, and the two ends of the back cable are connected with the steel anchor beam and the anchoring foundation arranged on the ground respectively; the calculation and arrangement method comprises the following steps: S1, designing and determining the position, height and structural form of a buckling tower; s2, designing and determining the number of layers and positions of steel anchor beams; s3, designing and determining the connection position of the buckle cable and the arch rib; s4, calculating the cable force of the fastening cable; s5, calculating the horizontal tension of the steel anchor beam; s6, calculating the cable force of the back cable at any horizontal angle; and S7, establishing a back cable length optimal quantity formula and performing solving. According to the technical scheme, optimized arrangement of the back cables of the cable-stayed buckling system is researched, the use amount of the back cables (steel strands) is reduced, and the construction cost is saved.

Description

Technical Field

[0001] The 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 an inclined-stayed buckle-hanging system. Background Art

[0002] Cable hoisting + cable-stayed buckle-hanging method is the main construction method for long-span arch bridges. The rationality and safety design of the cable-stayed buckle-hanging system directly affect the linear accuracy of the arch rib and the construction cost. At present, the span of the arch bridge under construction has exceeded 600m. The larger the span of the arch bridge, the higher the height and stiffness of the buckle tower of the cable-stayed buckle-hanging system, and the construction cost will increase exponentially. Existing standards and literatures have mentioned that considering the construction cost and the difficulty of arch rib linear control, the minimum horizontal angle of the connection between the buckle cable and the arch rib in the buckle-hanging system should not be less than 8°, but there is no literature or standard reporting on the size control of the connection angle between the back cable and the anchor foundation. The back cable is an important measure and structure to adjust the vertical force of the buckle tower and the horizontal force of the buckle cable to keep it approximately equal. The rational design and arrangement of the back cable is the main way to ensure the construction safety of the cable-stayed buckle-hanging system and reduce the construction cost. 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, and to reduce the amount of unnecessary back cables (steel strands) used in the construction process by studying the optimal arrangement of the back cables of the cable-stayed buckle system, thereby further saving the construction cost of the arch bridge construction.

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

[0005] The present invention discloses an optimal amount calculation and arrangement method of back cables of an inclined-stayed buckle-hanging system, wherein the inclined-stayed buckle-hanging system comprises a buckle tower, a buckle cable, a back cable, a steel anchor beam and an anchor foundation, wherein 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, so as to provide a balanced vertical force satisfying the linearity of the main arch installation for the arch rib installation, and the cable force of the buckle cable is transmitted to the buckle tower through the steel anchor beam, and the two ends of the back cable are respectively connected to the steel anchor beam and an anchor foundation arranged on the ground, so as to provide a vertical force for the buckle tower to maintain structural stability;

[0006] The calculation and arrangement method comprises 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-hang 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 cable and back cable are l ki , l bi The horizontal angles between the i-th cable and the 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 the i-th layer 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 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 ×h i / sinβ i =f mi ×h i / sin2β i ;

[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 strand is L bi Minimum, solve for βi =45°.

[0020] Furthermore, the anchor foundation includes a plurality of anchor rods, one end of each of the anchor rods is arranged under the ground, and an anchor box is arranged on the other end of each of the anchor rods. The anchor box is fixed to the other end of each of the anchor rods, and the upper surface of the anchor box is arranged flush with the ground. The interior of the anchor box is hollow, and a slideway is arranged on the upper surface of the anchor box. Slide rods are symmetrically arranged on both sides along the length direction of the interior of the anchor box, and the two ends of the slide rods are respectively fixedly connected to the inner side surfaces of the two end portions of the anchor box. A plurality of sliders are arranged on the slide rod, and the two ends of the sliders are slidably sleeved. It is arranged on the sliding rod, a screw rod is provided in the middle part of the sliding block, the sliding block is slidably connected to the screw rod, locking nuts are provided at both ends of the sliding block, the locking nuts are threadedly connected to the screw rod, and fixing plates are symmetrically provided in the length direction of the sliding block, one end of the fixing plate is fixed to the sliding block, and a U-shaped connecting frame is provided on the other end of the fixing plate, and the open ends of the U-shaped connecting frame are respectively rotatably connected to the other ends of the two fixing plates, and an anchor cup is provided at the other end of the U-shaped mounting frame, and the anchor cup 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, the other end of the side panel is provided with a rotating column, both ends of the rotating column are respectively rotatably connected to the other end of the side panel, a rope hole is provided in the middle of the rotating column, the back rope passes through the rope hole and is connected to the anchor cup, support columns are provided on the outer sides of the side panels, the support columns are arranged perpendicular to the side panels, one end of the support column is fixed to the side panel, the other end of the support column is provided with a supporting 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 plurality 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, when the angle of the back cable is adjusted to a specified value, 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 anchor foundation in the technical solution can adjust the anchor angle of the back cable to ensure the accuracy of the installation angle of the back cable, 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 may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 It is a schematic diagram of the process part 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 diagram of the interior of the anchor foundation of the present invention;

[0035] Figure 6 It is a three-dimensional schematic diagram of another viewing angle 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 sliding block and the side plate in the anchor foundation of the present invention.

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

[0038] 1. Snap tower; 2. Snap cable; 3. Arch rib; 4. Steel anchor beam; 5. Back cable; 6. Anchor foundation; 610. Anchor rod; 611. Anchor box; 612. Slide; 613. Slide bar; 614. Slider; 615. Screw; 616. Lock nut; 617. Fixed 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 Figure 1 to Figure 7 As shown, the present invention provides a simple calculation method for optimizing the arrangement of back cables in a diagonal buckle hanging system, and the implementation steps are as follows:

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

[0041] S2. Design and determine the number of layers and position of the steel anchor beam 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, it is known that the inclined-stayed buckle system is mainly composed 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 to provide 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 to provide 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. In an ideal state, the tower deviation of the buckle tower 1 is 0, and the horizontal components of force transmitted to the steel anchor beam 4 by the buckle cable 2 and the back cable 5 are equal.

[0048] In the above scheme, the design height of the cable tower 1 in the cable-stayed cable hanging system is H, m cable 2 and n back cables 5 are arranged, and the cable forces of the i-th cable 2 and back cables 5 are f ki 、f bi The lengths of the i-th 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 ith layer steel anchor beam 4 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 one-to-one, 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 tower 1 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 ×h i / sinβ i =f mi ×h i / sin2β i ;f mi 、h i are all known numbers, then when sin2β i =1 takes the maximum value, the total length (amount) of the back cable 5 strands is L bi The minimum is obtained, and βi=45°.

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

[0053]

[0054]

[0055] 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.

[0056] This method proves the calculation and arrangement position of the minimum design amount of the back cable 5, and effectively reduces the construction cost while ensuring the structural stability of the inclined buckle hanging system.

[0057] 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. 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 of the connection position between the anchoring foundation 6 and the back cable 5). If there is an error in the construction of the anchoring foundation 6, it is difficult to ensure that the back cable 5 is at the most suitable installation angle, resulting in the problem that the amount and force of the back cable 5 are affected.

[0058] Therefore, an anchor foundation 6 is also proposed in the present technical solution. Specifically, the anchor foundation 6 includes a plurality of anchor rods 610, one end of each of the anchor rods 610 is anchored under the ground, 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, sliding rods 613 are symmetrically provided on both sides of the interior of the anchor box 611 along the length direction, the two ends of the sliding rod 613 are respectively fixedly connected to the inner side surfaces of the two end portions of the anchor box 611, a plurality of sliding blocks 614 are provided on the sliding rod 613, and the two ends of the sliding blocks 614 The sliding sleeve is arranged on the sliding rod 613, and a screw rod 615 is arranged in the middle of the sliding block 614, and the sliding block 614 is slidably connected to the screw rod 615. Locking nuts 616 are arranged at both ends of the sliding block 614, and the locking nuts 616 are threadedly connected to the screw rod 615. The sliding block 614 is symmetrically provided with fixing plates 617 in the length direction, and one end of the fixing plate 617 is fixed to the sliding block 614, and a U-shaped connecting frame is arranged on the other end of the fixing plate 617. The open ends of the U-shaped connecting frame are respectively rotatably connected to the other ends of the two fixing plates 617, and an anchor cup 626 is arranged on the other end of the U-shaped mounting frame. 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.

[0059] The working principle of the above technical solution is:

[0060] When the back cable 5 is installed, firstly, its two ends are 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, at this time, it is only necessary to adjust the position of the slider 614 relative to the screw rod 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.

[0061] 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 realizing 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 rotatable, so that the end of the back rope 5 and the main body can always be kept in a straight line, thereby improving the force effect.

[0062] In an 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 .

[0063] In one practicable manner, 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, a rotating column 620 is provided on the other end of the side panel 619, both 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, 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 sides 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, a support rib 623 is provided on the other end of the support columns 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.

[0064] 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 slider 614 has moved to the limit after sliding, and the angle of the back rope 5 has not been adjusted to the desired position, then at this time, the position of the end of the support rib 623 on the anchor box 611 can be adjusted to change the inclination angle of the U-shaped connecting frame, and then 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, resulting in bending of the end of the back rope 5, resulting in stress concentration, and affecting the force-bearing performance of the back rope 5.

[0065] In one feasible manner, 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. A plurality of evenly arranged slots 625 are provided in the length direction of the groove. The slots 625 are arranged perpendicular to the grooves, and a block 624 is provided in the slot 625 for blocking and limiting the end of the support rib 623.

[0066] The grooves limit the lateral displacement of the support rib 623 to ensure the movement guidance and stability of the support rib 623. At the same time, the clamping plate can block the end of the adjusted support rib 623 to avoid displacement during tensioning. This setting method can adjust the position of the support rib 623 multiple times during the tensioning process, thereby accurately adjusting the angle of the back rope 5 multiple times.

[0067] 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 desired size, it is fixed by welding to ensure stability during connection and use.

[0068] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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 of a slant stay buckle system, characterized in that: 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); the steel anchor beam (4) is arranged on the buckle tower (1); the two ends of the buckle cable (2) are respectively connected to the arch rib (3) and the steel anchor beam (4), so as to provide a balanced vertical force satisfying the linearity of the main arch installation for the installation of the arch rib (3); the cable force of the buckle cable (2) is transmitted to the buckle tower (1) through the steel anchor beam (4); the two ends of the back cable (5) are respectively connected to the steel anchor beam (4) and an anchor foundation (6) arranged on the ground, so as to provide the buckle tower (1) with a vertical force to maintain structural stability; The calculation and arrangement method comprises 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 of the cable (2); S5. Calculate the horizontal tension of the steel anchor beam (4); S6, calculating the back cable (5) force at any horizontal angle; S7. Establish the optimal length formula of the back cable (5) and solve it.

2. The method for calculating and arranging the optimal amount of back cables of the inclined stay buckle system according to claim 1 is characterized in that: The calculation and arrangement method is specifically as follows: In the cable-stayed cable-hanging system, the design height of the cable tower (1) is H, and m cable ties (2) and n back cables (5) are arranged. The cable forces of the i-th cable ties (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 , 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 i-th back cable (5) at the tower (1) 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 ; 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 ×h i / sinβ i =f mi ×h i / sin2β i ; 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 is L bi Minimum, solve for β i =45°.

3. The method for calculating and arranging the optimal amount of back cables of the inclined stay buckle hanging system according to claim 1 is characterized by: The anchor foundation (6) comprises 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 arranged 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 arranged flush with the ground. The interior of the anchor box (611) is hollow, and a slideway (612) is arranged on the upper surface of the anchor box (611) and penetrates the anchor box. Slide rods (613) are symmetrically arranged 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). The two ends of the sliders (614) are arranged in a sliding sleeve. On the sliding rod (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 fixing plates (617) in the length direction, and one end of the fixing plate (617) is fixed to the slider (614), and the other end of the fixing 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 fixing plates (617), and 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 shoulder rope (5) to the U-shaped mounting frame.

4. The method for calculating and arranging the optimal amount of back cables of the inclined stay buckle system according to claim 3 is characterized by: 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).

5. The method for calculating and arranging the optimal amount of back cables of the inclined stay buckle system according to claim 3 is characterized by: The U-shaped connecting frame comprises a side plate (619) symmetrically arranged on both sides, one end of the side plate (619) is rotatably connected to the fixed plate (617), the other end of the side plate (619) is provided with a rotating column (620), both ends of the rotating column (620) are respectively rotatably connected to the other end of the side plate (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). A support column (622) is provided on the outer side surface of the side plate (619), and the support column (622) is arranged perpendicular to the side plate (619). One end of the support column (622) is fixed to the side plate (619), and the other end of the support column (622) is provided with a support rib (623), 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.

6. The method for calculating and arranging the optimal amount of back cables of the inclined stay buckle system according to claim 5 is characterized by: 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).

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

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