A method for constructing traction ropes and calculating anchor rope specifications for cable laying.

Abstract

This invention discloses a method for constructing traction ropes and calculating anchor rope specifications for cable laying, relating to the field of cable laying technology. The method includes the following steps: Step 1: Using a traction machine and a tensioning machine in conjunction with low tension, the traction rope is driven forward to pass through the corresponding area; Step 2: A walkway with a head and a tail is added, and the traction rope is connected to the rotary connector at the head of the walkway. Simultaneously, A parallel guide ropes are connected to the rotary connector at the tail of the walkway; Step 3: Using a traction machine and a tensioning machine in conjunction with low tension, the walkway is driven forward through the middle pulley of a pulley block on the tower. The pulley block has A pulleys, and at this time, A guide ropes, including the middle guide rope, are all wound around the middle pulley. This invention achieves a "one-to-many" construction method, improving the efficiency of cable laying, and uses an anchor rope calculation formula to optimally select an anchor rope of appropriate specifications, thus achieving better anchoring operations.

Description

Technical Field

[0001] This invention relates to the field of cable laying technology, specifically to a method for constructing a traction rope and a method for calculating anchor rope specifications for cable laying. Background Technology

[0002] In recent years, with the large-scale development and transmission of clean energy in western my country, the construction of ultra-high voltage (UHV) transmission lines has flourished. As the most important part of UHV transmission line construction, the stringing technology has evolved from the initial manual laying to the current full-tension stringing construction.

[0003] After the ultra-high voltage (UHV) transmission towers are erected and accepted, tension stringing is required to complete the installation of the transmission conductors. Tension stringing is a method of laying conductors (ground wires) in the air, using traction machines, tensioning machines, and other construction equipment to lift them off the ground and obstacles during the laying process. The existing tension stringing technology can be represented as follows:

[0004] Step 1: Deploying the guide rope. The primary guide rope is deployed using a flight vehicle, then manually assisted by passing it through a series of drop pulleys, deploying it in sections and connecting it to adjacent sections. Other higher-level guide ropes are then deployed using the already deployed guide ropes.

[0005] Step 2: Release the guide rope and traction rope. Use a small traction machine to wind up the guide rope, thereby replacing the guide rope in the construction section with the traction rope.

[0006] Step 3: Release the conductor using the traction rope. Use the main traction machine to wind up the traction rope, thereby replacing the traction rope in the construction section with the conductor.

[0007] In step 1 above, the guide rope needs to be threaded onto the pulley at the corresponding position during the deployment and traction process. Multiple guide ropes correspond to multiple pulleys, so the deployment and traction of multiple guide ropes requires multiple threading operations. This construction method involves many repetitive procedures, consumes a lot of time, and is likely to prolong the construction period.

[0008] The deployment of guide ropes typically employs a distributed deployment method, which involves dividing a cable-laying section into 2-5 smaller segments. First, a rotary-wing drone is used to deploy the primary guide rope within each segment. Then, the primary guide rope is progressively transitioned to the corresponding specification of the traction rope. Finally, the traction ropes in several areas are connected to each other to form a whole.

[0009] by Figure 1 For example, Figure 1 This is represented as follows: first, a Φ3.5 primary guide rope is deployed using a rotary-wing UAV, then gradually transitions to the □13 traction rope, and then the □13 traction ropes in each block are connected to form a whole. The □13 traction rope is then pulled by a traction machine and a tension machine until it gradually transitions to the □28 traction rope.

[0010] Even though construction teams in different regions have made improvements to the above construction methods based on local conditions, for example, patent document CN204760879U discloses a device for deploying a guide rope for a live-line working drone. This device aims to improve deployment efficiency by optimizing and improving the steps of deploying the guide rope for the drone. Specifically, the device includes a drone, a deployment spool, a remote controller, a steel weight, and a release device. The release device is fixed under the drone's fuselage and has an internal annular electromagnet. The outer diameter of the weight matches the inner diameter of the annular electromagnet, and it can be fixed or released by the annular electromagnet. The guide rope is fixed to the tail of the weight, and the other end of the guide rope is fixed to the deployment spool through an insulated transmission rope. The drone and the release device are controlled by a remote controller.

[0011] For example, patent application CN117228433A discloses a miniature high-speed tension machine device. This device, by designing a power unit and a tension unit on the main body of the tension machine, enables the tension machine to actively adjust the tension of the guide rope. When the guide rope is wound on the tension wheel, the drone pulls the guide rope, and the guide rope pulls the tension wheel to rotate. The tension unit changes the power of the rotation drive structure to achieve the tension of the guide rope and can perform stepless adjustment, ensuring that the guide rope is not easy to knot, derail, or become disordered.

[0012] Based on the existing conductor traction construction methods and improvements, it can be seen that the existing conductor traction construction methods have the disadvantages of complicated operation steps and large workload. In addition, the number of tensioning machines and traction machines required is large, which increases the construction cost. At the same time, construction personnel need to perform high-altitude auxiliary traction operations multiple times during the construction process. Long-term high-intensity high-altitude operations can easily cause fatigue of the workers and lead to accidents.

[0013] To address these issues, we propose a method for constructing traction ropes and calculating anchor rope specifications for cable laying. Summary of the Invention

[0014] The purpose of this invention is to address the problems in the prior art by proposing a method for constructing a traction rope and calculating the specifications of anchor ropes for cable laying. This method utilizes structures such as guide plates to achieve a "one-to-many" construction approach, improving the efficiency of cable laying. Furthermore, by using anchor rope calculation formulas to optimally select suitable anchor rope specifications, construction personnel can easily operate the anchor ropes to perform corresponding actions during cable laying, shortening the overall cable laying construction time and further improving the efficiency of cable laying.

[0015] To address the above problems, the present invention provides the following technical solution:

[0016] A method for constructing a traction rope for cable laying includes the following steps:

[0017] Step 1: Use a traction machine and a tension machine in combination to drive the traction rope through the corresponding area with low tension in a positive direction;

[0018] Step 2: Add a walkway with a head and a tail. Connect the traction rope to the rotary connector at the head of the walkway. At the same time, connect A parallel guide ropes to the rotary connector at the tail of the walkway.

[0019] Step 3: Using a traction machine and a tension machine in combination, the walkway is driven in a low-tension forward direction through the middle pulley of the pulley block on the tower. The pulley block has A pulleys. At this time, A guide ropes, including the middle guide rope, are all wrapped around the middle pulley.

[0020] Step 4: The construction workers use anchor rope A-1 to temporarily anchor the A-1 guide rope (excluding the middle guide rope) to the tower in sequence, and drive the traction rope and the A guide rope to move in opposite directions together until the A-1 anchor rope is taut.

[0021] Step 5: Keep anchor rope A-1 taut, and continue to pull the middle guide rope in the opposite direction with the traction rope until the guide rope A-1 is slack.

[0022] Step Six: Then disconnect the A-1 guide rope from the tail of the slide, and wind the A-1 guide ropes out from the middle slide of the slide block, and wind them onto the other A-1 slides of the slide block in sequence. Then connect the A-1 guide ropes to the rotary connector at the tail of the slide block.

[0023] Step 7: Finally, drive the traction rope to move forward until the end of the A-1 anchor rope connected to the A-1 guide rope is in a slack state. At this time, disconnect the A-1 anchor rope from the A-1 guide rope to complete the rope splitting work, so that the A guide ropes are respectively wound around the A pulleys on the pulley block.

[0024] Step 8: Subsequently, connect the A cables to be erected in the corresponding area to the A guide rope and use a traction machine and tension machine to pull them to the designated position to complete the construction.

[0025] As a further solution: the guide rope is set to four, and the head and tail of the walkway are respectively fixed with one rotary connector and three rotary connectors, and the three rotary connectors are arranged side by side. The rotary connector at the head is used for connecting the traction rope, and the three rotary connectors at the tail are used for connecting the three guide ropes respectively. A rotary connector for connecting the remaining guide rope is set at the tail of the walkway and above the middle rotary connector.

[0026] As a further embodiment: the pulley block consists of four sets of pulleys, three of which are arranged horizontally side by side on the first crossarm of the tower, and the remaining set of pulleys is arranged on the second crossarm of the tower, and this set of pulleys is located above the three sets of pulleys.

[0027] As a further option, the following preliminary preparation steps are included before proceeding to step one:

[0028] S1: Deploy the primary guide rope using a drone;

[0029] S2: Connect the primary guide rope to the first-level guide rope, and use the traction machine and tension machine in conjunction to pull the first-level guide rope with low tension;

[0030] S3: Connect the primary guide rope to the secondary guide rope, and use the traction machine and tension machine in conjunction to pull the secondary guide rope with low tension;

[0031] S4: Connect the secondary guide rope to the traction rope, and use the traction machine and tension machine to drive the traction rope with low tension.

[0032] Furthermore, the present invention also proposes an anchor rope specification calculation method to calculate the anchor rope specification so as to be adapted to the above-mentioned traction rope construction method for cable laying, and the anchor rope specification is obtained by the calculation formula of the construction load it bears.

[0033] Construction load T borne by the anchor rope i The calculation formula is as follows:

[0034] T i =L i ×g;

[0035] In the formula: T i L represents the construction load borne by the anchor rope located between the (i-1)th tower and the ith tower. i denoted as the length of the guide rope located between the (i-1)th tower and the i-th tower span, and g represents the gravity load per unit length of the guide rope.

[0036] As a further option: the length L of the guide rope in the above formula i The calculation formula is expressed as follows:

[0037]

[0038] In the formula: Let l represent the tilt angle of the line connecting the (i-1)th tower and the suspension point of the ith tower. i Let F represent the span between the (i-1)th tower and the ith tower, g represent the gravitational load per unit length of the guide rope, and F represent the span between the (i-1)th tower and the ith tower. i This is expressed as the tension during the horizontal laying of the guide rope.

[0039] As a further option: the tilt angle in the above formula The calculation formula is expressed as follows:

[0040]

[0041] Where: Δh i Let l represent the height difference between the (i-1)th tower and the ith tower's guide rope suspension point. i It represents the span between the (i-1)th tower and the i-th tower.

[0042] As a further solution: The tension F of the guide rope during horizontal laying. i The calculation formula is expressed as follows:

[0043]

[0044] In the formula: x represents the horizontal distance from the obstacle between the (i-1)th tower and the i-th tower to the anchor point on the traction side of the i-th tower; m represents the distance from the anchor point on the traction side of the i-th tower to the ground; y represents the clearance distance from the obstacle between the (i-1)th tower and the i-th tower to the guide rope; l i It represents the span between the (i-1)th tower and the i-th tower.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. This invention adds a walkway for transferring traction ropes and guide ropes, and uses the walkway to realize "one-to-many" traction work, so that a single traction rope can pull multiple guide ropes at the same time. Compared with the "one-to-one" traction in the prior art, this invention shortens the construction time and improves the construction efficiency; and through the rope splitting operation, multiple guide ropes can be wound around the corresponding pulleys respectively, which facilitates the subsequent laying and arrangement of cables.

[0047] 2. This invention calculates the construction load of the anchor rope required between any two adjacent towers. In actual use, it allows for the selection of the most suitable anchor rope based on factors such as terrain and distance, preventing situations where the selected anchor rope specification does not match the construction load. It also avoids inconvenience caused by selecting an anchor rope with a too-large diameter, such as difficulties in subsequent cable laying and pulley operation. This invention utilizes an anchor rope calculation formula to optimally select the appropriate anchor rope specification, enabling construction personnel to easily operate the anchor rope during cable laying and shortening the overall cable laying construction time.

[0048] 3. This invention utilizes a walkway structure, specifically: one and three rotary connectors are fixedly installed at the head and tail of the walkway, respectively, with the three rotary connectors arranged side-by-side. Another rotary connector is located at the tail of the walkway, above the middle rotary connector. This walkway structure allows for the distribution and spacing of multiple traction ropes. During the subsequent passage of the walkway over the pulley, this facilitates faster rope separation by construction workers, further shortening the rope separation time and improving the overall efficiency of cable erection. Attached Figure Description

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] Figure 1 This is a flowchart of the distributed deployment process of the guide rope in the existing technology;

[0051] Figure 2 This is a diagram showing the on-site layout of the tension field of the present invention;

[0052] Figure 3 This is a top view schematic diagram of the walkway structure in this invention;

[0053] Figure 4 This is a front view schematic diagram of the walkway structure in this invention;

[0054] Figure 5 This is a schematic diagram of the anchor rope connection structure of the present invention;

[0055] Figure 6 This is a schematic diagram of the rewinding operation structure of the present invention;

[0056] Figure 7 This is a schematic diagram of the rope-splitting operation structure of the present invention;

[0057] Figure 8 This is a schematic diagram of the forward traction structure of the present invention;

[0058] Figure 9 This is a schematic diagram of the construction of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Example 1:

[0061] like Figures 2-8As shown, a method for constructing a traction rope for cable laying specifically includes the following steps:

[0062] Step 1: Construction preparation: Select suitable traction field, tension field, traction machine and tension machine, and select appropriate specifications of traction rope, anchor rope, etc.

[0063] Step 2: Deploy the primary guide rope using a rotary-wing drone. Generally, a Φ3.5 Dyneema rope is selected for this primary guide rope. Specifically, the excess Φ3.5 Dyneema rope is first manually pulled out. Then, the two Φ3.5 Dyneema ropes are spliced ​​together on the segment tower. The splice uses a 30kN bending-resistant connector. After the entire line is connected, the Φ3.5 Dyneema rope is moved into the pulley of the tower.

[0064] Step 3: Connect the primary guide rope to the first-level guide rope. Use a traction machine and a tension machine to move the first-level guide rope with low tension. Generally, the first-level guide rope is a Φ6 Dyneema rope. Specifically, use a Φ3.5 Dyneema rope to pull the Φ6 Dyneema rope in a one-to-one manner. The traction is done by a tractor winch with low tension, and the joint is a 30kN anti-bending connector.

[0065] Step 4: Connect the primary guide rope to the secondary guide rope. Use a traction machine and a tension machine to move the secondary guide rope with low tension. Generally, the secondary guide rope is a Φ13 DuPont wire rope. Specifically, use a Φ6 Dyneema rope to pull the Φ13 DuPont wire rope in a one-to-one manner. The traction is done by a tractor winch with low tension. The joint is a 30kN anti-bending connector.

[0066] Step 5: Connect the secondary guide rope to the traction rope. Use a traction machine and a tension machine to drive the traction rope with low tension. Generally, the traction rope here is a □13 anti-twist rope. Specifically, use a Φ13 DuPont wire rope to pull the □13 anti-twist rope in a one-to-one manner. During the deployment, the □13 anti-twist rope is deployed using a small tension machine, and the Φ13 DuPont wire rope is pulled using a small traction machine.

[0067] Step Six: Use a traction machine and a tension machine in combination to drive the traction rope through the corresponding area with low tension in a positive direction;

[0068] Step 7: Add a walkway with a head and a tail, connect the traction rope to the rotary connector at the head of the walkway, and connect A parallel guide ropes to the rotary connector at the tail of the walkway.

[0069] Step 8: Using a traction machine and a tension machine in combination, drive the walkway in a low-tension forward direction to pass through the middle pulley of the pulley block on the tower. The pulley block has A pulleys, and at this time, A guide ropes are all wrapped around the middle pulley.

[0070] Step 9: The construction workers use anchor rope A-1 to temporarily anchor the A-1 guide rope (excluding the middle guide rope) to the tower in sequence, and drive the traction rope and the A guide rope to move in opposite directions together until the A-1 anchor rope is taut.

[0071] Step 10: Keep anchor rope A-1 taut, and continue to pull the middle guide rope in the opposite direction with the traction rope until both guide ropes A-1 are slack.

[0072] Step 11: Then disconnect the A-1 guide rope from the tail of the walkway, and take all A-1 guide ropes out from the middle pulley of the pulley group, and then wrap them around the other A-1 pulleys of the pulley group in turn. Then connect the A-1 guide ropes to the rotary connectors at the tail of the walkway.

[0073] Step 12: Finally, drive the traction rope forward until the end of the A-1 anchor rope connected to the A-1 guide rope is in a slack state. At this time, disconnect the A-1 anchor rope from the A-1 guide rope to complete the rope splitting work, so that the A guide ropes are respectively wound around the A pulleys on the pulley block.

[0074] Step 13: Connect the A cables to be erected in the corresponding area to the A guide rope and use a traction machine and tension machine to pull them to the designated position to complete the construction.

[0075] During the traction process using traction ropes, specifically steps six through thirteen, the number of guide ropes is set to four (three □13 anti-torsion ropes and one Φ13 DuPont wire rope), i.e., A=4. In this setup, two large tension machines and one small tension machine need to be arranged in the tension field. The two large tension machines provide tension for the three □13 anti-torsion ropes, and the small tension machine provides tension for the Φ13 DuPont wire rope. The on-site layout of the tension field is as follows: Figure 2 As shown in the diagram: 101 represents the traction rope, 102 represents the guide plate, 103 represents the □13 anti-twist rope, 104 represents the Φ13 DuPont wire rope, 105 represents the large tension machine, 106 represents the ground anchor, 107 represents the rope guide frame, and 108 represents the small tension machine. Steps six through twelve are explained in detail below:

[0076] Step Six: Use a traction machine and a tension machine in combination to drive the traction rope through the corresponding area with low tension in a positive direction;

[0077] Step 7: Add a walkway with a head and a tail. Connect the traction rope to the rotary connector at the head of the walkway, and connect three □13 anti-twist ropes and one Φ13 DuPont rope to the rotary connector at the tail of the walkway. Specifically: First, connect the traction rope to the rotary connector at the head of the walkway, and then connect three parallel □13 anti-twist ropes and one Φ13 DuPont rope to the rotary connector at the tail of the walkway. The head and tail of this walkway are respectively equipped with one and three rotary connectors, arranged side-by-side. The rotary connector at the head is used for connecting the traction rope, and the three rotary connectors at the tail are used for connecting the three □13 anti-twist ropes. A rotary connector for connecting the Φ13 DuPont rope is located at the tail of the walkway, above the middle rotary connector.

[0078] The specific structure of the board can be determined by Figure 3 and Figure 4 The positional relationship between the three □13 anti-torsion ropes and one Φ13 DuPont wire rope can also be seen in the diagram. In the diagram: 101 represents the traction rope, 102 represents the guide plate, 103 represents the □13 anti-torsion rope, 202 represents the transition rope used to transfer the □13 anti-torsion rope to the rotary connector, 201 represents the rotary connector on the guide plate and the transition rope, and 104 represents the Φ13 DuPont wire rope. From Figure 3 and Figure 4 It can be seen that two rotary connectors are located in the middle of the tail of the walkway. The two rotary connectors are arranged in an upper and lower position, and the Φ13 DuPont wire rope is connected to the rotary connector located at the upper position.

[0079] Step 8: Using a traction machine and a tensioner in conjunction, drive the walkway in a low-tension forward direction through the middle pulley of the pulley block on the tower. The pulley block has four pulleys, and the layout of the four pulleys can be determined by... Figure 7 To illustrate, at this point, all three □13 anti-twist ropes and one Φ13 DuPont rope are wound around the central pulley. Specifically, as the plank slowly passes the central pulley, the traction speed is reduced until the plank is 40 meters away from the central pulley, at which point traction stops. It is important to note that the distance past the pulley should not be too short; otherwise, the subsequent Φ13 DuPont ropes, after being routed to their respective pulleys, will not be able to reconnect with the plank, and the two □13 anti-twist ropes on both sides will experience skipping when traction is resumed after being routed to their respective pulleys.

[0080] Step Nine: Construction workers temporarily anchor two □13 anti-torsion ropes and one Φ13 DuPont wire rope located on both sides to the tower using three anchor ropes. The middle □13 anti-torsion rope (connected to the swivel connector at the top center of the cable tray) is then used in conjunction with the traction rope to apply reverse traction until all three anchor ropes are taut. The anchor rope specifications are selected using an anchor rope calculation formula. This formula optimizes the selection of suitable anchor rope specifications, allowing construction workers to easily manipulate the anchor ropes during subsequent cable installation, thus shortening the overall cable installation time.

[0081] Anchor rope connection diagram can be derived from Figure 5 The following diagrams are used to represent the following: 101 represents the traction rope, 102 represents the walkway, 103 represents the □13 anti-twist rope, 104 represents the Φ13 DuPont wire rope, 204 represents the pulley, 205 represents the first crossarm, 206 represents the second crossarm, 301 represents the anchor rope, and 302 represents the ferry rope.

[0082] Step 10: Next, use the □13 anti-twist rope that is not attached to the anchor rope and is located in the middle position to continue to pull in the opposite direction with the traction rope until the two □13 anti-twist ropes on both sides and the Φ13 DuPont wire rope are all in a slack state.

[0083] This diagram of the rewinding reverse traction operation can be derived from... Figure 6 The following diagrams are used to represent the following: 101 represents the traction rope, 102 represents the walkway, 103 represents the □13 anti-twist rope, 104 represents the Φ13 DuPont wire rope, 204 represents the pulley, 205 represents the first crossarm, 206 represents the second crossarm, 301 represents the anchor rope, and 302 represents the ferry rope.

[0084] Step 11: Then disconnect the two □13 anti-twist ropes and one Φ13 DuPont wire rope located on both sides from the tail of the slide. Take the two □13 anti-twist ropes and one Φ13 DuPont wire rope out from the middle pulley of the pulley group, and then wrap them around the two pulleys on both sides of the pulley group and the pulley above it in sequence. Then connect the two □13 anti-twist ropes and one Φ13 DuPont wire rope to the rotary connector at the tail of the slide.

[0085] This step is specifically as follows:

[0086] (1) During step ten, when the walkway moves back to the preset position of the trolley, stop the rewinding operation. A high-altitude construction worker uses a special tool to open the rotary connectors that connect the two □13 anti-twist ropes on both sides of the walkway tail. Remove the two □13 anti-twist ropes and wrap them around the middle trolley. Then put them into the two trolleys on both sides respectively and reconnect them to the rotary connectors on both sides of the walkway tail.

[0087] (2) After the two □13 anti-twist ropes are separated, another Φ13 DuPont wire rope is separated. Similarly, a high-altitude construction worker uses a special tool to open the rotary connector located at the top of the middle of the tail of the walkway. The guide rope 302 is wound on the pulley located at the top. The Φ13 DuPont wire rope is taken off and wound out of the middle pulley. Then, the end of the Φ13 DuPont wire rope is connected to one end of the pre-reserved guide rope 302. The other end of the guide rope is manually pulled to pull the Φ13 DuPont wire rope through the pulley at the top to the walkway. The connection between the Φ13 DuPont wire rope and the guide rope is disconnected. Then, the Φ13 DuPont wire rope is reconnected to the rotary connector located at the top of the middle of the tail of the walkway. The rope separation step is completed. It should be noted that after the two □13 anti-twist ropes and one Φ13 DuPont wire rope are reconnected to the rotary connector at the tail of the walkway, traction begins. The traction speed should not be too fast, because at this time the angle between the two □13 anti-twist ropes on both sides of the tail of the walkway is very large, and the phenomenon of detachment from the pulley will occur if the speed is too fast.

[0088] The state after the rope is split can be determined by... Figure 7 To represent this, the forward traction state after rope splitting can be represented by... Figure 8 In the diagram, 101 represents the traction rope, 102 represents the walkway, 103 represents the □13 anti-twist rope, 104 represents the Φ13 DuPont wire rope, 203 represents the tower, 204 represents the pulley, 205 represents the first crossarm, 206 represents the second crossarm, 301 represents the anchor rope, and 302 represents the ferry rope.

[0089] Step 12: Finally, drive the traction rope forward until the end where the three anchor ropes are connected to the two □13 anti-torsion ropes and the Φ13 DuPont wire rope is in a slack state. Then, the high-altitude construction personnel disconnect the three anchor ropes from the two □13 anti-torsion ropes and the Φ13 DuPont wire rope, thus completing the rope splitting work. This means that the three □13 anti-torsion ropes and the Φ13 DuPont wire rope are respectively wound around the four pulleys on the pulley block.

[0090] Step 13: Subsequently, connect the four cables to be erected in the corresponding area to three □13 anti-twist ropes and one Φ13 DuPont wire rope guide rope, and use a traction machine and tensioner to pull them to the designated position to complete the construction.

[0091] Example 2:

[0092] In the process of anchoring two Φ13 anti-torsion ropes and one Φ13 DuPont wire rope using three anchor ropes, the anchor ropes will be subjected to various tensile forces. It is necessary to ensure that the total force on the anchor rope is less than its own strength threshold to ensure the rope splitting process can be completed normally. If a high-strength (larger diameter) anchor rope is blindly selected to anchor the traction rope, the increased overall mass of the anchor rope will make it more inconvenient for construction workers to attach one end of the anchor rope to the tower. Furthermore, being at a height will further restrict the range of motion of the construction workers, limiting their operational capabilities. Additionally, after rope splitting, if the larger diameter anchor rope is not a perfect match for the pulley groove size, or if the size difference is small, the anchor rope may become stuck in the pulley groove and unable to pass through, thus preventing the completion of subsequent construction steps. Therefore, the following provides a reference for selecting anchor rope specifications to optimize the selection of suitable anchor ropes.

[0093] An anchor rope specification calculation method is provided to calculate the anchor rope specifications for appropriate application in the aforementioned cable laying traction rope construction method. The anchor rope specifications are derived from the calculation formula based on the construction load it bears, as follows:

[0094] The entire traction erection process can be described by... Figure 9 In the diagram, 203 represents a tower, 401 represents a tension field, 402 represents a traction field, 403 represents an obstacle, and 404 represents a guide rope. Multiple towers are arranged sequentially between the tension field and the traction field. If any one of the towers is represented as the i-th tower, then the towers adjacent to the i-th tower on the left and right are represented as the (i-1)-th tower and the (i+1)-th tower, respectively.

[0095] After the guide rope passes through the middle pulley of the pulley block on the i-th tower and splits, the guide rope is fully distributed within the overhead line span. The length of the guide rope can be calculated using the parabolic method:

[0096]

[0097] In the formula, L i This represents the length of the guide rope located between the (i-1)th tower and the ith tower span. The angle of inclination (with the horizontal direction as the reference) is represented by the line connecting the (i-1)th tower and the suspension point of the ith tower. i Let F represent the span between the (i-1)th tower and the ith tower, g represent the gravitational load per unit length of the guide rope, and F represent the span between the (i-1)th tower and the ith tower. i This is expressed as the horizontal tension of the guide rope, which is provided by a tension field tension meter. Its specific value is calculated based on the minimum tension required for the guide rope to maintain a safe distance from the object being crossed within the span.

[0098] The above Represented as:

[0099]

[0100] In the formula, Δh i Let l represent the height difference between the (i-1)th tower and the ith tower's guide rope suspension point. i It represents the span between the (i-1)th tower and the i-th tower.

[0101] F in the above i Represented as:

[0102]

[0103] In the formula: x represents the horizontal distance from the obstacle between the (i-1)th tower and the i-th tower to the anchor point on the traction side of the i-th tower; m represents the distance from the anchor point on the traction side of the i-th tower to the ground; y represents the clearance distance from the obstacle between the (i-1)th tower and the i-th tower to the guide rope; l i It represents the span between the (i-1)th tower and the i-th tower.

[0104] Some parameters in the above formula are in Figure 9 It is marked in the middle.

[0105] Based on the above, the construction load T borne by the anchor rope located between the (i-1)th tower and the i-th tower can be obtained. i :

[0106] T i =L i ×g;

[0107] In the formula, L i denoted as the length of the guide rope located between the (i-1)th tower and the i-th tower span, and g represents the gravity load per unit length of the guide rope.

[0108] This invention calculates the construction load of the anchor rope required between any two adjacent towers. In actual use, it can select the most suitable anchor rope based on factors such as different terrain and distance, preventing the selected anchor rope specifications from being unsuitable for the construction load. It also avoids the inconvenience of subsequent slab movement and pulley crossing caused by selecting an anchor rope with a larger diameter.

[0109] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for constructing a traction rope for cable erection, characterized in that, Includes the following steps: Step 1: Use a traction machine and a tension machine in combination to drive the traction rope through the corresponding area with low tension in a positive direction; Step 2: Add a walkway with a head and a tail. Connect the traction rope to the rotary connector at the head of the walkway. At the same time, connect A parallel guide ropes to the rotary connector at the tail of the walkway. Step 3: Using a traction machine and a tension machine in combination, the walkway is driven in a low-tension forward direction through the middle pulley of the pulley block on the tower. The pulley block has A pulleys. At this time, A guide ropes, including the middle guide rope, are all wrapped around the middle pulley. Step 4: The construction workers use anchor rope A-1 to temporarily anchor the A-1 guide rope (excluding the middle guide rope) to the tower in sequence, and drive the traction rope and the A guide rope to move in opposite directions together until the A-1 anchor rope is taut. Step 5: Keep anchor rope A-1 taut, and continue to pull the middle guide rope in the opposite direction with the traction rope until the guide rope A-1 is slack. Step Six: Then disconnect the A-1 guide rope from the tail of the slide, and wind the A-1 guide ropes out from the middle slide of the slide block, and wind them onto the other A-1 slides of the slide block in sequence. Then connect the A-1 guide ropes to the rotary connector at the tail of the slide block. Step 7: Finally, drive the traction rope to move forward until the end of the A-1 anchor rope connected to the A-1 guide rope is in a slack state. At this time, disconnect the A-1 anchor rope from the A-1 guide rope to complete the rope splitting work, so that the A guide ropes are respectively wound around the A pulleys on the pulley block. Step 8: Subsequently, connect the A cables to be erected in the corresponding area to the A guide rope and use a traction machine and tension machine to pull them to the designated position to complete the construction; The specifications of the anchor rope are derived from the calculation formula based on the construction load it bears. Construction load T borne by the anchor rope i The calculation formula is as follows: T i =L i ×g; In the formula: T i L represents the construction load borne by the anchor rope located between the (i-1)th tower and the ith tower. i denoted as the length of the guide rope located between the (i-1)th tower and the i-th tower span, and g represents the gravity load per unit length of the guide rope; The length L of the guide rope in the above formula i The calculation formula is expressed as follows: In the formula: Let l represent the tilt angle of the line connecting the (i-1)th tower and the suspension point of the ith tower. i Let F represent the span between the (i-1)th tower and the ith tower, g represent the gravitational load per unit length of the guide rope, and F represent the span between the (i-1)th tower and the ith tower. i This is expressed as the tension during the horizontal laying of the guide rope.

2. The method for constructing a traction rope for cable erection according to claim 1, characterized in that, The guide ropes are configured as four. The head and tail of the walkway are respectively fixed with one rotary connector and three rotary connectors, and the three rotary connectors are arranged side by side. The rotary connector at the head is used for connecting the traction rope, and the three rotary connectors at the tail are used for connecting the three guide ropes respectively. A rotary connector for connecting the remaining guide rope is provided at the tail of the walkway and above the middle rotary connector.

3. The method for constructing a cable-stayed cable laying traction rope according to claim 2, characterized in that, The pulley block consists of four sets of pulleys, three of which are arranged horizontally side by side on the first crossarm of the tower, and the remaining set of pulleys is arranged on the second crossarm of the tower, and this set of pulleys is located above the three sets of pulleys.

4. The method for constructing a traction rope for cable erection according to claim 1, characterized in that, Before proceeding to step one, the following preliminary preparation steps are also included: S1: Deploy the primary guide rope using a drone; S2: Connect the primary guide rope to the first-level guide rope, and use the traction machine and tension machine in conjunction to pull the first-level guide rope with low tension; S3: Connect the primary guide rope to the secondary guide rope, and use the traction machine and tension machine in conjunction to pull the secondary guide rope with low tension; S4: Connect the secondary guide rope to the traction rope, and use the traction machine and tension machine to drive the traction rope with low tension.

5. A method for constructing a cable-laying traction rope according to claim 1, characterized in that, The tilt angle in the above formula The calculation formula is expressed as follows: Where: Δh i Let l represent the height difference between the (i-1)th tower and the ith tower's guide rope suspension point. i It represents the span between the (i-1)th tower and the i-th tower.

6. The method for constructing a traction rope for cable erection according to claim 1, characterized in that, Horizontal tension F of the guide rope i The calculation formula is expressed as follows: In the formula: x represents the horizontal distance from the obstacle between the (i-1)th tower and the i-th tower to the anchor point on the traction side of the i-th tower; m represents the distance from the anchor point on the traction side of the i-th tower to the ground; y represents the clearance distance from the obstacle between the (i-1)th tower and the i-th tower to the guide rope; l i It represents the span between the (i-1)th tower and the i-th tower.

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