Temporary cableway bridge main cable river-crossing construction method

Abstract

The invention discloses a temporary cableway bridge main cable river-crossing construction method, and relates to the technical field of bridge construction. The main cable passes through the river; connecting the main cable with the anchor cable; tightening the main rope; adjusting the vector of the single cable; integrally adjusting to a set vector; the river crossing mode of the main cables can be selected according to the number of the main cables, when the number of the main cables is small, the one-time cable crossing mode can be selected, the construction time can be remarkably shortened, and the construction efficiency can be improved; when the number of the main cables is large, a four-section cable passing mode can be adopted, the construction process is conducted in a sectional mode, cable passing fixing of the middle main cable is preferentially conducted, then cable passing fixing of the middle main cables on the two sides of the middle main cable is conducted, and finally cable passing fixing adjusting is conducted in the mode that the two sides of the three middle main cables face the middle, so that the construction progress is effectively managed, and the construction efficiency is improved. And the construction quality of each stage can be ensured, so that the safety and the reliability of the whole construction are improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a main cable of a temporary cableway bridge crossing a river. Background Art

[0002] A cableway bridge is a bridge built on a row of cables anchored on both sides of a river or valley. It is mainly used to overcome obstacles in mountainous rivers and canyons, and can also be used in other river sections where floating bridges or fixed bridges are not suitable. Cableway bridges have a wide range of uses, such as temporary bridges for water conservancy and hydropower construction projects, for pedestrians, vehicles or materials transportation; they can also be used as emergency bridges for military and disaster relief projects, and can cross deep canyons, rivers with rapid currents and steep banks, for people, tracked vehicles and wheeled vehicles to pass; they are also used as cableway bridges in scenic areas for tourists to walk, etc. Its main components are: load-bearing parts (main cables, stabilizing cables, beams, etc.), bridge deck components, connection and adjustment components (connectors and tensioners), anchors, bridge foundations, etc. The main cables are usually made of steel wire ropes, and each bridge has dozens to dozens of them, which are evenly arranged longitudinally or arranged in a rutted manner.

[0003] At present, the mainstream methods of installing main cables across rivers mainly include towing by boats and traction by aerial catwalks. Although traditional methods have met the construction needs to a certain extent, when facing the construction of bridges of different scales and different numbers of main cables, the existing construction methods lack flexible construction solutions for different numbers of main cables. When the bridge design requires multiple main cables to cross the river at the same time, how to efficiently and safely carry out the simultaneous construction of multiple cables becomes an urgent problem to be solved. That is, a single construction method is difficult to adapt to all situations, especially when there are a large number of main cables. How to reasonably arrange the construction sequence and ensure the coordination between the main cables becomes a major challenge.

[0004] Secondly, due to the lack of a systematic mechanism for selecting construction methods, it is difficult to accurately assess the time, cost and possible risks required in the early stages of construction, which not only increases the uncertainty of the project, but also brings greater difficulties to the construction organization.

[0005] Therefore, it is necessary to design a construction method for the main cable of a temporary cableway bridge to cross the river to solve the above technical problems. Summary of the invention

[0006] In response to the above-mentioned problems, the present application provides a method for constructing a main cable crossing a river for a temporary cableway bridge. The method for crossing the river of the main cables can be selected according to the number of main cables. When the number of main cables is small, a one-time crossing method can be selected, which can significantly reduce the construction time and improve the construction efficiency. When the number of main cables is large, a four-stage crossing method can be adopted to divide the construction process into sections, with priority given to the crossing and fixing of the middle main cable, and then the crossing and fixing of the middle main cables on both sides of the middle main cable, and finally the crossing and fixing of the three middle main cables are adjusted from both sides to the middle. This not only effectively manages the construction progress, but also ensures the construction quality at each stage, thereby improving the safety and reliability of the overall construction.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for constructing a main cable of a temporary cableway bridge across a river, which comprises the following steps:

[0008] S1. First, pour concrete at the corresponding positions on both banks and pre-embed multiple anchor cables, and then fix multiple traction wheels at the corresponding positions on both banks by anchor nails;

[0009] S2. Arrange a traction winch on one bank, and a winch and three tension winches on the other bank, and anchor the traction winch and tension winch to the ground;

[0010] S3. Number the main ropes and traction wheels in sequence;

[0011] S4, the leading rope is pulled from the water surface to the other side by a boat, and then the hemp rope is manually fixed to the traction winch, and the towing rope is pulled over and wound on the traction winch through the traction winch. After the entire bridge spans, the rope head of the towing rope is fixed to the towing rope on the other side, and towed to the other side, and then the towing rope is fixed to the anchor cables on both sides and erected on the middle towing rope, and then the towing rope is wound on the traction winch;

[0012] S5. Select the main cable passing method according to the number of main cables. When the number of main cables is small, one-time passing is adopted. When the number of main cables is large, it is divided into four-stage passing:

[0013] a. When the number of main cables is small, after both ends of the towing cable are fixed, the main cable at the center of the abutment is passed first, and the towing cable is withdrawn to the other side of the cable bridge. The hook is installed on the towing cable, and the end of the main cable is hung on the hook and fixed with wire. The rear main cable is installed on the hook, and then pulled to one side by the towing winch. One side is fixed to the corresponding anchor cable through a connector, and the other side is fixed to the anchor cable through a tensioning and adjusting device of the jack well. After the first main cable is fixed, the middle main cable is used as the towing cable to pull the two main cables at the same time, and the two main cables are respectively installed on the outermost traction wheels, and the remaining main cables are installed from both ends to the middle position and installed on the corresponding traction wheels;

[0014] b. When there are a large number of main cables, after both ends of the towing cable are fixed, the first stage is to pass the central main cable of the bridge abutment, retreat the towing cable to the other side of the cable bridge, install the hook on the towing cable, hang the end of the main cable on the hook and fix it with wire, and then install the rear main cable on the hook, and then use the towing winch to tow it to one side. One side is fixed to the corresponding anchor cable through a connector, and the other side is fixed to the anchor cable through the tensioning and adjusting device of the jack well. After the first main cable is fixed, use the first main cable as the towing cable, pass the central main cable on both sides of the bridge abutment, and hang the second and third main cables on the towing cable at the same time to tow them to one side. After one side is fixed, pull the towing cable back through the towing winch on the other side. At the same time, the tensioning winch on the other side should fix the main cable. When retreating to the vicinity of the abutment on the other side, fix the two main cables and the towing cable together with a rope clamp, then retreat the towing cable to the vicinity of the abutment, and then untie the main cables and towing cables one by one. In the second stage, the middle main cable in the center of the abutment is used as the towing cable to pull the two main cables over at the same time, and the two main cables are respectively installed on the corresponding outermost traction wheels, and the remaining main cables are installed from both ends to the middle position and installed on the corresponding traction wheels. The third stage of main cable crossing the river uses the second main cable as the central towing cable, and pulls the remaining main cables over in the order from both ends to the middle and installs them on the corresponding traction wheels; the fourth stage of main cable crossing the river uses the third main cable as the central towing cable, and pulls the remaining main cables over in the order from both ends to the middle and installs them on the corresponding traction wheels;

[0015] S6. One side of the main cable is connected with a connector, and the other side is connected with a jack tensioning and adjusting tension adjuster. The single cable vector of the main cable is adjusted by adjusting the jack tensioning and adjusting tension adjuster. At the same time, the verticality of the main cable is observed with a level to adjust the overall main cable to the designed vector.

[0016] Furthermore, preferably, the tow rope and the main rope are both made of steel wire ropes, and the diameter of the main rope is at least twice the diameter of the tow rope.

[0017] Further, as a preference, both ends of the tow rope and the main rope are fixed with lock buckles through a plurality of rope clamps, and at least 1 m of tail rope is reserved for the tow rope and the main rope.

[0018] Furthermore, preferably, anchor bars are fixedly arranged at the rear of the traction winch and the tensioning winch, and the anchor bars are respectively connected to the bases of the traction winch and the tensioning winch through steel wire ropes, and each of the traction winch and the tensioning winch is connected to at least two steel wire ropes.

[0019] Further, as a preference, the hook comprises: a Y-shaped base, a roller is rotatably provided on the inner side of the upper end of the Y-shaped base, and hooks are fixedly provided on both sides of the lower end of the Y-shaped base.

[0020] Further, as a preference, the tension adjustment device for the jack well comprises a group of positioning buckles which are respectively hooked with the anchor cable on one side and the towing cable and the main cable on the other side, and the positioning buckles are threadedly connected with adjusting screws.

[0021] Compared with the prior art, the present invention provides a method for constructing a main cable of a temporary cableway bridge across a river, which has the following beneficial effects:

[0022] 1. The present invention can select the way of crossing the river of the main cables according to the number of main cables. When the number of main cables is small, a one-time crossing method can be selected, which can significantly reduce the construction time and improve the construction efficiency. When the number of main cables is large, a four-stage crossing method can be adopted to divide the construction process into sections, and the crossing and fixing of the middle main cable is performed first, and then the crossing and fixing of the middle main cables on both sides of the middle main cable are performed, and finally the crossing and fixing of the three middle main cables are adjusted in a way that the two sides of the three middle main cables are moved toward the middle. This not only effectively manages the construction progress, but also ensures the construction quality of each stage, thereby improving the safety and reliability of the overall construction.

[0023] 2. The present invention uses a single ship towing, and subsequently only needs to guide the main cable through the towing cable for installation, which greatly simplifies the initial installation steps of the main cable across the river, reduces the number of round trips of the ship, and reduces the risk of water operations. The aerial cable crossing operation using the towing cable is safer and more controllable than ship operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0025] Figure 1 It is a schematic diagram of the overall process of a construction method for a temporary cableway bridge main cable crossing a river;

[0026] Figure 2 It is a schematic diagram of the elevation structure of a cableway bridge in a construction method of a temporary cableway bridge main cable crossing a river;

[0027] Figure 3 A schematic diagram of the positions of the main cable and the towing cable in a construction method for a temporary cable bridge crossing a river;

[0028] Figure 4 A schematic diagram of the structure of a hook in a construction method for crossing a river with the main cable of a temporary cableway bridge;

[0029] Figure 5 It is a schematic diagram of a fixed structure on one side of a tow cable or a main cable in a construction method for crossing a river with a main cable of a temporary cableway bridge;

[0030] Figure 6A schematic diagram of a structure in which the other side of a tow cable or main cable is fixed in a construction method for a temporary cable bridge main cable crossing a river;

[0031] Figure 7 It is a schematic diagram of the arrangement sequence of the main cables in a construction method for main cables of a temporary cableway bridge crossing a river;

[0032] Figure numerals: 1. anchor cable; 2. traction wheel; 3. tow rope; 4. hook; 5. traction rope; 6. main rope; 7. rope clamp; 8. jack tension adjustment tension adjuster; 9. connector; 41. Y-shaped base; 42. roller; 43. hook; 81. adjustment screw; 82. positioning buckle. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0035] See also Figure 1-Figure 7 The embodiment of the present invention provides a method for constructing a main cable of a temporary cableway bridge across a river, which comprises the following steps:

[0036] S1, first pour concrete at the corresponding positions on both banks and pre-embed multiple anchor cables 1, and then fix multiple traction wheels 2 at the corresponding positions on both banks by anchor nails;

[0037] S2. Arrange a traction winch on one bank, and a winch and three tension winches on the other bank, and anchor the traction winch and tension winch to the ground;

[0038] S3, numbering the main rope 6 and the traction wheel 2 in sequence;

[0039] S4, the leading rope is pulled from the water surface to the other side by a boat, and then the hemp rope is manually fixed to the traction winch, and the traction winch is used to pull the towing rope 3 over and wind it around the traction winch, and after the entire bridge is pulled across the other side, the rope head of the traction rope 5 is fixed to the towing rope 3, and the towing rope is towed to the other side, and then the towing rope 3 is fixed to the anchor rope 1 on both sides and erected on the middle traction rope 5, and then the traction rope 5 is wound around the traction winch;

[0040] S5. Select the method of passing the main cables 6 according to the number of the main cables 6. When the number of the main cables 6 is small, a one-time passing method is used. When the number of the main cables 6 is large, a four-stage passing method is used:

[0041] a. When the number of main cables 6 is small, after the two ends of the towing cable 3 are fixed, the main cable 6 at the center of the abutment is passed first, and the towing cable 5 is withdrawn to the other side of the cable bridge. The hook 4 is installed on the towing cable 3, and the end of the main cable 6 is hung on the hook 4 and fixed with wire. The rear main cable 6 is installed on the hook 4, and then pulled to one side by the towing winch. One side is fixed to the corresponding anchor cable 1 through the connector 9, and the other side is fixed to the anchor cable 1 through the tensioning and adjusting device 8 of the jack. After the first main cable 6 is fixed, the middle main cable 6 is used as the towing cable 3 to pull the two main cables 6 at the same time, and the two main cables 6 are respectively installed on the outermost traction wheel 2, and the remaining main cables 6 are installed from the two ends to the middle position and installed on the corresponding traction wheel 2;

[0042] b. When there are a large number of main cables 6, after both ends of the towing cable 3 are fixed, the first stage is to pass the central main cable 6 of the bridge abutment, and the traction cable 5 is withdrawn to the other side of the cable bridge. The hook 4 is installed on the towing cable 3, and the end of the main cable 6 is hung on the hook 4 and fixed with a wire. The rear main cable 6 is installed on the hook 4, and then pulled to one side by a traction winch. One side is fixed to the corresponding anchor cable 1 through a connector 9, and the other side is fixed to the anchor cable 1 through a tensioning and adjusting tension adjuster 8 of a jack well. After the first main cable 6 is fixed, the first main cable 6 is used as the towing cable 3, passing the central main cable 6 on both sides of the bridge abutment, and the second and third main cables 6 are hung on the towing cable 3 at the same time and pulled to one side. After one side is fixed, the traction cable 5 is pulled back by the traction winch on the other side. At the same time, the tensioning winch on the other side should fix the main cable 6 to prevent the main cable 6 from falling down due to the recovery of the traction cable 5. Entering the reservoir, when the traction rope 5 is withdrawn to the vicinity of the abutment on the other side, the two main ropes 6 and the towing rope 3 are fixed together with the rope clamp 7, and then the traction rope 5 is withdrawn to the vicinity of the abutment, and then the main rope 6 and the towing rope 3 are successively untied. In the second stage, the main rope 6 uses the middle main rope 6 in the center of the abutment as the towing rope 3 to pull the two main ropes 6 over at the same time, and the two main ropes 6 are respectively erected on the corresponding outermost traction wheels 2, and the remaining main ropes 6 are installed and erected on the corresponding traction wheels 2 from both ends to the middle position. The third stage main rope 6 crosses the river with the second main rope 6 as the central towing rope 3, and the remaining main ropes 6 are pulled over and erected on the corresponding traction wheels 2 in the order from both ends to the middle; in the fourth stage main rope 6 crosses the river with the third main rope 6 as the central towing rope 3, and the remaining main ropes 6 are pulled over and erected on the corresponding traction wheels 2 in the order from both ends to the middle;

[0043] S6 and the main cable 6 are connected on one side by a connector 9, and on the other side by a jack tensioning and adjusting tension adjuster 8. The single cable vector of the main cable 6 is adjusted by adjusting the jack tensioning and adjusting tension adjuster 8. At the same time, the verticality of the main cable 6 is observed with a level, and the main cable 6 is adjusted as a whole to the designed vector.

[0044] It should be noted that the cableway bridge in the present application adopts a frame-type abutment on one side and a gravity-type abutment on the other side. In the construction of the main cable 6 of the temporary cableway bridge across the river, there is generally no fixed value for the boundary value of more cables and less cables, but it is determined according to specific engineering requirements, span, load and other factors; when the main cable 6 is untied from the towing cable 3, no personnel are allowed to stay on the platform in front of the abutment to prevent others from being injured when the main cable 6 bounces off.

[0045] Based on the above technical scheme, the method of passing the main cables 6 is selected according to the number of main cables 6. When the number of main cables 6 is small, a one-time passing method can be selected, which can significantly reduce the construction time and improve the construction efficiency; when the number of main cables 6 is large, a four-stage passing method can be adopted to divide the construction process into sections, giving priority to the passing and fixing of the middle main cable 6, and then the passing and fixing of the middle main cables 6 on both sides of the middle main cable 6, and finally adjusting the passing and fixing of the three middle main cables 6 from both sides to the middle. This not only effectively manages the construction progress, but also ensures the construction quality at each stage, thereby improving the safety and reliability of the overall construction.

[0046] On the basis of the above technical solution, through a single ship towing, the main cable 6 only needs to be guided and installed through the towing cable 5, which greatly simplifies the initial installation steps of the main cable 6 across the river, reduces the number of round trips of the ship, and reduces the risks of water operations. The aerial cable crossing operation performed by the towing cable 5 is safer and more controllable than ship operations.

[0047] In a possible implementation manner, the tow rope 3 and the main rope 6 are both made of steel wire ropes, and the diameter of the main rope 6 is at least twice the diameter of the tow rope 3. The mass of the tow rope 3 is smaller than that of the main rope 6. When the tow rope 3 is towed by the traction winch, the traction force is smaller. On the one hand, the cost can be effectively reduced, and on the other hand, the tow rope 3 can be quickly guided and positioned. When the number of main ropes 6 is large, after the first main rope 6 is fixed, the first main rope 6 is used as the tow rope 3. The hook 4 on the first main rope 6 can carry two main ropes 6 across the river, which reduces the bearing force of the tow rope 3 from the side and prolongs its service life.

[0048] In a possible implementation manner, both ends of the tow rope 3 and the main rope 6 are fixed with lock buckles through a plurality of rope clips 7, and the tail ropes of the tow rope 3 and the main rope 6 are reserved for at least 1 m, which is conducive to fixing the tow rope 3 and the main rope 6 to the connector 9 and the jack tensioning and adjusting tension adjuster 8 respectively, thereby reducing the risk of loose ropes.

[0049] In a possible implementation, anchor bars are fixedly installed at the rear of the traction winch and the tensioning winch, and the anchor bars are respectively connected to the bases of the traction winch and the tensioning winch through steel wire ropes, and each of the traction winch and the tensioning winch is connected to at least two steel wire ropes to prevent the traction winch and the tensioning winch from moving due to tension, resulting in unstable cable release.

[0050] In a possible implementation, the hook 4 includes: a Y-shaped base 41 , a roller 42 is rotatably provided on the inner side of the upper end of the Y-shaped base 41 , and hook heads 43 are fixedly provided on both sides of the lower end of the Y-shaped base 41 .

[0051] By adopting the above technical solution, the towing rope 3 and the main rope 6 can be passed between the roller 42 and the Y-shaped base 41. When the main rope 6 passes the center of the abutment, the traction rope 5 is retreated to the other side of the cable bridge, the hook 4 is installed on the towing rope 3, the end of the main rope 6 is hung on the hook 43 and fixed with wire, and the rear main rope 6 is installed on the hook 43; when the number of main ropes 6 is large, the main rope 6 in the second stage uses the middle main rope 6 in the center of the abutment as the towing rope 3, and the ends of the two main ropes 6 are respectively hung on the hooks 43 on both sides and fixed with wire, and then the rear main rope 6 is installed on the hook 43.

[0052] In a possible embodiment, the jack tensioning and adjusting tension adjuster 8 includes a group of positioning buckles 82 which are respectively hooked with the anchor cable 1 on one side and the towing cable 3 and the main cable 6 on the other side. The positioning buckles 82 are threadedly connected with adjusting screws 81, and the adjusting screws 81 can adjust the spacing between the positioning buckles 82, thereby adjusting the angle of the main cable 6.

[0053] During the specific implementation, concrete is first poured at the corresponding positions on both sides and multiple anchor cables 1 are pre-buried, and then multiple traction wheels 2 are fixed at the corresponding positions on both sides through anchor nails; a traction winch is arranged on one side, and a winch and three tensioning winches are arranged on the other side, and the traction winch and the tensioning winch are anchored to the ground. For example, the towing cable 3 is a Φ20mm steel wire rope, and the number of main cables 6 is 48. First, the main cables 6 are numbered 1-48# in sequence, and the leading cable is used to pull the hemp rope from the water surface to the other side through a small boat, and then the hemp rope is manually fixed to the traction winch, and the Φ20mm towing cable 3 is pulled over and wound on the traction winch through the traction winch, and after the entire bridge span is pulled, the towing cable 3 is pulled over and wound on the traction winch on the other side. The end of the guide rope 5 is fixed to the towing rope 3, and the towing rope 3 is towed to the opposite bank. The towing rope 3 is then fixed to the anchor cables 1 on both sides and erected on the middle towing rope 5. The towing rope 5 is then wound around the towing winch. After the two ends of the Φ20mm towing rope 3 are fixed, the main rope 6 at the center of the bridge abutment is passed in the first stage. The towing rope 5 is withdrawn to the other side of the cable bridge, and the hook 4 is installed on the towing rope 3. The end of the main rope 6 is hung on the hook head 43 of the hook 4 and fixed with wire. The rear main rope 6 is installed on the hook head 43, and then the towing winch is used to tow and pull to one side. One side is fixed to the corresponding anchor cable 1 through the connector 9, and the other side is fixed to the anchor cable 1 through the tensioning adjuster 8 of the jack well. After the first main rope 6 is fixed, the first main rope 6 is used as the towing rope 3 , then hang the 7# and 42# main ropes 6 on the towing rope 3 at the same time and tow them to one bank. After one bank is fixed, pull the towing rope 5 back through the towing winch on the other bank. At the same time, the tensioning winch on the other bank should fix the main rope 6. When the towing rope 5 is withdrawn to the vicinity of the bridge abutment on the other bank, fix the two main ropes 6 and the towing rope 3 together with the rope clamp 7. Then withdraw the towing rope 5 to the vicinity of the bridge abutment, and then untie the main rope 6 and the towing rope 3 one by one. In the second stage, the main rope 6 uses the middle 24# main rope 6 as the towing rope 3 to tow the two main ropes 6 at the same time, and the two main ropes 6 are respectively erected on the corresponding outermost traction wheel 2. The remaining main ropes 6 are from 14#-23# on one side and from 35#-25# on the other side from both ends to the middle position. The main rope 6 is installed and erected on the corresponding traction wheel 2. The third-stage main rope 6 crosses the river with the 7# main rope 6 as the central towing rope 3, and the remaining main ropes 6 are towed over and erected on the corresponding traction wheel 2 in the order from both ends to the middle; the fourth-stage main rope 6 crosses the river with the 42# main rope 6 as the central towing rope 3, and the remaining main ropes 6 are towed over and erected on the corresponding traction wheel 2 in the order from both ends to the middle. The main rope 6 is connected on one side with a connector 9, and on the other side with a jack tensioning and adjusting tension adjuster 8, and the single rope vector of the main rope 6 is adjusted by adjusting the adjusting screw 81, and the verticality of the main rope 6 is observed with a level, and the main rope 6 is adjusted to the design vector as a whole, and finally the towing rope 3, each hook 4 and the traction rope 5 are recovered.

[0054] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for constructing a main cable of a temporary cableway bridge across a river, characterized in that: The following steps are involved: S1, first pouring concrete at corresponding positions on both banks and pre-embedding a plurality of anchor cables (1), and then fixing a plurality of traction wheels (2) at corresponding positions on both banks by anchor nails; S2. Arrange a traction winch on one bank, and a winch and three tension winches on the other bank, and anchor the traction winch and tension winch to the ground; S3, numbering the main rope (6) and the traction wheel (2) in sequence; S4, the guide rope is pulled from the water surface to the other side by a boat, and then the hemp rope is manually fixed to the traction winch, and the traction winch is used to pull the towing rope (3) over and wind it around the traction winch. After the entire bridge is pulled across the other side, the rope head of the traction rope (5) is fixed to the towing rope (3), and the towing rope is towed to the other side. The towing rope (3) is then fixed to the anchor ropes (1) on both sides and installed on the middle traction rope (5), and then the traction rope (5) is wound around the traction winch; S5. Select a method for passing the main cables (6) according to the number of the main cables (6). When the number of the main cables (6) is small, a one-time passing method is adopted. When the number of the main cables (6) is large, a four-stage passing method is adopted: a. When the number of main cables (6) is small, after the two ends of the towing cable (3) are fixed, the main cable (6) at the center of the bridge abutment is passed first, and the towing cable (5) is withdrawn to the other side of the cable bridge. The hook (4) is installed on the towing cable (3), and the end of the main cable (6) is hung on the hook (4) and fixed with wire. The rear main cable (6) is installed on the hook (4), and then pulled to one side by a towing winch. One side is fixed to the corresponding anchor cable (1) through a connector (9), and the other side is fixed to the anchor cable (1) through a tensioning and adjusting device (8) of a jack. After the first main cable (6) is fixed, the middle main cable (6) is used as the towing cable (3) to pull the two main cables (6) at the same time, and the two main cables (6) are respectively installed on the outermost traction wheel (2), and the remaining main cables (6) are installed from the two ends to the middle position and installed on the corresponding traction wheel (2); b. When the number of main cables (6) is large, after the two ends of the towing cable (3) are fixed, the main cable (6) at the center of the bridge abutment is passed in the first stage, and the towing cable (5) is withdrawn to the other side of the cable bridge. The hook (4) is installed on the towing cable (3), and the end of the main cable (6) is hung on the hook (4) and fixed with wire. The main cable (6) is then installed on the hook (4), and then pulled to one side by a towing winch. One side is fixed to the corresponding anchor cable (1) through a connector (9), and the other side is connected to the anchor cable (1) through a connector (9). The tensioning and adjusting device (8) of the jack well is fixed to the anchor cable (1). After the first main cable (6) is fixed, the first main cable (6) is used as the towing cable (3), the central main cable (6) on both sides of the bridge abutment is passed, and the second and third main cables (6) are simultaneously hung on the towing cable (3) and towed to one bank. After the fixing of one bank is completed, the towing cable (5) is pulled back by the towing winch on the other bank. At the same time, the tensioning winch on the other bank should fix the main cable (6). When the towing cable (5) is withdrawn, When the bridge is near the other side of the bridge, the two main cables (6) and the towing cable (3) are fixed together with a rope clamp (7), and then the towing cable (5) is withdrawn to the vicinity of the bridge abutment, and the main cables (6) and the towing cables (3) are successively untied. In the second stage, the main cable (6) uses the middle main cable (6) in the center of the bridge abutment as the towing cable (3) to pull the two main cables (6) at the same time, and the two main cables (6) are respectively installed on the corresponding outermost traction wheels (2), and the remaining main cables (6) are arranged from both ends to the The middle position is installed and erected on the corresponding traction wheel (2); the third stage main rope (6) crosses the river with the second main rope (6) as the central towing rope (3), and the remaining main ropes (6) are towed over in the order from the two ends to the middle and erected on the corresponding traction wheel (2); the fourth stage main rope (6) crosses the river with the third main rope (6) as the central towing rope (3), and the remaining main ropes (6) are towed over in the order from the two ends to the middle and erected on the corresponding traction wheel (2); S6 and the main cable (6) are connected on one side by a connector (9) and on the other side by a tensioning and adjusting tension regulator (8) of a jack. The single cable vector of the main cable (6) is adjusted by adjusting the tensioning and adjusting tension regulator (8) of the jack. At the same time, the verticality of the main cable (6) is observed by a level, and the main cable (6) is adjusted as a whole to the designed vector.

2. A method for constructing a main cable of a temporary cableway bridge across a river according to claim 1, characterized in that: The towing rope (3) and the main rope (6) are both made of steel wire ropes, and the diameter of the main rope (6) is at least twice the diameter of the towing rope (3).

3. The method for constructing a temporary cableway bridge main cable across a river according to claim 1, characterized in that: Both ends of the towing rope (3) and the main rope (6) are fixed with lock buckles through a plurality of rope clamps (7), and the tail ropes of the towing rope (3) and the main rope (6) are reserved for at least 1 m.

4. A method for constructing a temporary cableway bridge main cable across a river according to claim 1, characterized in that: Anchor bars are fixedly arranged at the rear of the traction winch and the tension winch, and the anchor bars are respectively connected to the bases of the traction winch and the tension winch through steel wire ropes, and each of the traction winch and the tension winch is connected to at least two steel wire ropes.

5. The method for constructing a temporary cableway bridge across a river according to claim 1, characterized in that: The hook (4) comprises a Y-shaped base (41), a roller (42) is rotatably arranged on the inner side of the upper end of the Y-shaped base (41), and hook heads (43) are fixedly arranged on both sides of the lower end of the Y-shaped base (41).

6. The method for constructing a temporary cableway bridge main cable across a river according to claim 1, characterized in that: The tensioning and adjusting device (8) for adjusting the tension of the jack well comprises a group of positioning buckles (82) which are respectively arranged to be engaged with the anchor cable (1) on one side and with the towing cable (3) and the main cable (6) on the other side, and the positioning buckles (82) are connected with adjusting screws (81) through threads.

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