CN-122013666-A - Method for adjusting main cable length of ground anchor knapsack pad sleeper of cable system

Abstract

The invention provides a method for adjusting the length of a main cable of a cable system ground anchor knapsack, which is characterized in that the relation among the radius of the main ground anchor knapsack, the thickness of the sleeper and a cable length adjusting value is established by analyzing geometry, the thickness value of the main ground anchor knapsack can be obtained according to the relation on the premise that the radius of the main ground anchor knapsack and the cable length adjusting value are known, and in the process of adjusting the sag of the main cable, the cable can be quickly plugged to complete cable adjustment, the repeated operation in the construction process is avoided, and the construction efficiency is improved.

Inventors

• HUANG YESHENG
• LI SHIYING
• MAO DANDAN
• FAN SHOUHONG
• ZHOU TAO
• HUANG XIAOLONG
• WANG CHUJIE
• Luo Qilu
• ZHOU GUANGMING
• Wei jingguang
• Zhong Zhiliu
• LIANG JING
• LIAO BOLIN
• LUO LIHE

Assignees

• 广西路桥工程集团有限公司

Dates

Publication Date

20260512

Application Date

20260107

Claims (5)

1. 1. The method for adjusting the length of the main rope by adopting the main ground anchor knapsack of the sleeper stopper cushion cable system so as to increase the length of the main rope wound on the knapsack and further reduce the sag of the midspan main rope is characterized by comprising the following steps of: S1, establishing a relation among a main ground anchor knapsack radius, a sleeper thickness and a cable length adjustment value by analyzing geometry, and calculating the sleeper thickness by introducing the known main ground anchor knapsack radius and the cable length adjustment value into the established relation on the premise of known knapsack radius and cable length adjustment value; S2, the main ground anchor of the cable system is used for wrapping the sleeper, the thickness of the sleeper of the pad is the thickness of the sleeper calculated in the step S1, and the sag of the main cable of the midspan can be adjusted to a set value.
2. 2. The method for adjusting the main cable length of the cable system ground anchor backpack corkscrew of claim 1, wherein a rectangular coordinate system is established by taking the center of a corkscrew of the corkscrew as an origin, the x axis is a horizontal line, the y axis is a vertical line, the center of the main ground anchor backpack is marked as C 2 , and the coordinates are [ ] , ) The radius R of the main ground anchor knapsack is a known quantity, the center of the sleeper is marked as C 1 , the coordinates are (0, 0), the radius R is a required quantity and is the thickness of the sleeper, and the main ground anchor knapsack is provided with And Is the common tangent of the main ground anchor knapsack and the sleeper, B is the common tangent The point of tangency with the crosstie, Is a common tangent line Tangent point with sleeper C is common tangent line Tangent point with main ground anchor knapsack, C' is common tangent line The tangent point with the main ground anchor knapsack; the horizontal included angle of the connecting line between the main ground anchor knapsack and the center of the sleeper is consistent with the angle of the main cable and is a known value, and the cable length is adjusted Calculated according to the following formula: (1); In the formula, Is the distance between the tangent point C and the tangent point B; Is the tangent point Arc length between the cutting point B and the cutting point; Is the tangent point And tangent point The arc length between them.
3. 3. A method of adjusting the length of a main rope with a cable system ground anchor backpack filler sleeper according to claim 2, The length of (2) is calculated according to the following formula: (2); in the middle of (a) ) Is the coordinate of the tangential point B ) Is the coordinate of the tangent point C, which, among other things, (3); (4); (5); (6); (7); (8); (9); (10)。
4. 4. A method of adjusting the length of a main rope with a cable system ground anchor backpack filler sleeper according to claim 3, The length of (2) is calculated according to the following formula: (11); in the middle of (a) ) Is the tangent point The calculation formula is as follows: (12); (13); 。
5. 5. a method of adjusting the length of a main rope with a cable system ground anchor backpack filler sleeper according to claim 4, The length of (2) is calculated according to the following formula: ; in the middle of (a) ) Is the coordinate of the tangential point C ) Is the tangent point Wherein, in the above-mentioned coordinates, ; ; ; ; ; And (3) taking the formulas (2) - (20) into the formula (1), and establishing a relation among the radius of the main ground anchor knapsack, the thickness of the sleeper and the cable length adjusting value.

Description

Method for adjusting main cable length of ground anchor knapsack pad sleeper of cable system Technical Field The invention relates to the technical field of cable hoisting system installation and construction, in particular to a method for adjusting the length of a main cable by a ground anchor knapsack pad sleeper of a cable system. Background The cable hoisting system consists of a main cable, a tower, a ground anchor, a cable wind and other systems, wherein the main cable is a main stressed member for bearing hoisting weight, and is the focus of design and construction. As a steel wire rope, the sag of the steel wire rope during installation is a key control index, the sag of a main rope is required to be repeatedly adjusted in actual construction, the hoisting operation can be performed within the range of a design error, and otherwise, the whole system has great potential safety hazard. As shown in FIG. 1, the midspan sag of the main rope installation state is represented by f a, the midspan sag of the working state is represented by f b, and the sag is an important parameter of the main rope shape, and directly determines the stress condition of the main rope in the hoisting state. The main rope of the cable hoist system is mounted in the middle of the tower (indicated by black lines). When the cable hoisting system performs hoisting operation, the main cable needs to be transversely moved to a working position (indicated by red lines). When the f a＜fb condition appears after the transverse movement is finished, the main rope is required to be subjected to line length adjustment, and the midspan sag error in the working state and the installation state is reduced. As shown in fig. 2, the method for adjusting the length of the main rope generally adopts a sleeper plug to pad the main ground anchor knapsack so as to achieve the purpose of temporarily increasing the radius of the knapsack, so that the length of the main rope wound on the knapsack is increased, and the sag of the midspan main rope is reduced. The thickness of the sleeper chock is generally provided by construction experience or obtained by comparing similar projects when the cable length is adjusted, the method is suitable for bridges with smaller spans, but for bridge systems with large spans, the thickness of the chock is often seldom used as a reference case. Meanwhile, the thickness of the plug pad obtained by the empirical value often deviates from the actual thickness, so that the sleeper needs to be temporarily increased and reduced, and proper cable length and mid-span sagging degree can be obtained by a plurality of adjusting methods, so that the corresponding construction process is complicated, and the cable length adjusting efficiency is low. In addition, because the radius of the main ground anchor knapsack is different, the empirical value of the thickness of the stopper pad is limited by mutual reference among different projects. Disclosure of Invention In order to solve the technical problems in the background art, the invention provides a method for adjusting the length of a main cable by using a ground anchor knapsack pad sleeper of a cable system, which can improve the length adjustment efficiency of the main cable. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A method for adjusting the length of a main rope by a cable system ground anchor knapsack gasket sleeper adopts a main ground anchor knapsack of the sleeper gasket cable system, so that the length of the main rope wound on the knapsack is increased, and the sag of a midspan main rope is reduced, and the method comprises the following steps: S1, establishing a relation among a main ground anchor knapsack radius, a sleeper thickness and a cable length adjustment value by analyzing geometry, and calculating the sleeper thickness by introducing the known main ground anchor knapsack radius and the cable length adjustment value into the established relation on the premise of known knapsack radius and cable length adjustment value; S2, the main ground anchor of the cable system is used for wrapping the sleeper, the thickness of the sleeper of the pad is the thickness of the sleeper calculated in the step S1, and the sag of the main cable of the midspan can be adjusted to a set value. Further, a rectangular coordinate system is established by taking the circle center of the sleeper of the chock as an origin, the x-axis is a horizontal line, the y-axis is a vertical line, the circle center of the main ground anchor knapsack is marked as C 2, and the coordinates are #,) The radius R of the main ground anchor knapsack is a known quantity, the center of the sleeper is marked as C 1, the coordinates are (0, 0), the radius R is a required quantity and is the thickness of the sleeper, and the main ground anchor knapsack is provided withAndIs the common tangent of the main ground anchor knapsack and the sleeper, B is the comm