Multi-hole traction system and construction method of steel strand bundle of high tower column double cable plane cable-stayed bridge

Abstract

The present invention belongs to the technical field of bridge construction, and is specifically a multi-hole traction system and construction method for a steel strand bundle of a high-tower double-cable-plane cable-stayed bridge. It includes a forward and reverse winch; a fixed pulley at the end of a steel cable conduit, which is installed at the lower end of the steel cable conduit I; a fixed pulley at the end of a tower column, which is installed at the position of the steel strand to be fixed on the tower column; an adjustment end fixed pulley, which is connected to a telescopic tensioning device; a traction steel wire rope, one end of which is connected to a first steel strand tractor, and the other end of which passes through the fixed pulley at the left end of the steel cable conduit, the drum of the forward and reverse winch, the fixed pulley at the left adjustment end, the drum of the forward and reverse winch, the fixed pulley at the right adjustment end, the fixed pulley at the right end of the steel cable conduit, the fixed pulley at the right end of the tower column, and the fixed pulley at the left end of the tower column, and finally connects to the first steel strand tractor.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular is a multi-hole traction system for steel strand bundles of a high-tower column double-cable plane cable-stayed bridge and a construction method. Background Art

[0002] The commonly used methods for cable traction installation of existing cable-stayed bridges are:

[0003] ① Use a crane installed on the top of the tower to pull the cable. This method is relatively simple to operate and is suitable for some small and medium-span cable-stayed bridges. However, for large-span cable-stayed bridges, the lifting capacity and operating radius of the tower-top crane are often limited.

[0004] ② Bridge crane traction method: A crane is set up on the bridge deck, and the cable is pulled by the crane's hoisting system. This method can better adapt to low-tower cable-stayed bridges of different spans, but for working conditions with large spans and high tower cable hanging heights, a large lifting height is required. Therefore, conventional cranes below 100 tons are difficult to meet the use requirements and are not economical. At the same time, the stability and safety of the bridge crane need to be ensured, and the economic and safety applicability is low.

[0005] ③ Circular traction method: Use circular traction equipment to gradually insert the cable into the cable hole through multiple circular tractions. This method is highly efficient and is particularly suitable for the traction installation of long cable. For example, the existing patent with the public technology application number CN202311301823.3 forms a cyclic traction loop by winding the steel wire rope through the steering pulleys arranged at the upper and lower ends of the cable and the winch arranged at the bottom of the tower, and realizes the upward traction transmission of the cable steel strand along the hypotenuse direction through the steel strand clamping device fixed at the lower end of the traction steel wire rope in the direction of the cable to assist the installation of the cable in the upper hole.

[0006] However, the cyclic traction system has the following problems: ① For the construction of the cable-stayed cable, the steel strands need to pass through the cable guide tube as a whole. Since the steel strands and the transmission ropes must pass through the closed cable guide tube together, so that the casing can guide the cable and ultimately protect the steel strand bundle, this method requires the cable guide tube to be cut or destroyed along the tube body. In addition, when the last few steel strands are bundled, the space inside the tube is very small, and it is difficult to ensure the smooth movement of the steel strand clamp in the protective tube, which is obviously inconsistent with the actual situation. ② The system can only carry out the traction auxiliary installation of a single hole steel strand in one traction transmission cycle. After all the steel strands in one hole are pulled, the next hole can be constructed. Therefore, the traction installation efficiency of the cable-stayed cable is low for working conditions with large spans, tight construction periods, or a large number of cable holes. If multiple holes need to work at the same time, it is necessary to invest a corresponding number of equipment and manpower, which is obviously not economical. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a multi-hole traction system for steel strand bundles of a high-tower column double-cable plane cable-stayed bridge and a construction method.

[0008] The present invention adopts the following technical scheme: a multi-hole traction system for steel strand bundles of a high-tower column double-cable plane cable-stayed bridge, comprising:

[0009] Forward and reverse winch;

[0010] A fixed pulley at the end of the cable conduit, the fixed pulley at the end of the cable conduit is installed at the lower end of the cable conduit I, and two fixed pulleys are provided at the end of the cable conduit, namely, a fixed pulley at the left side of the cable conduit and a fixed pulley at the right side of the cable conduit;

[0011] A tower column end fixed pulley, the tower column end fixed pulley is installed at the position of the tower column where the steel strand is to be fixed, and two tower column end fixed pulleys are provided, namely a left tower column end fixed pulley and a right tower column end fixed pulley;

[0012] An adjusting end fixed pulley, wherein the adjusting end fixed pulley is connected to the telescopic tensioning device, and two adjusting end fixed pulleys are provided, namely a left adjusting end fixed pulley and a right adjusting end fixed pulley;

[0013] A traction wire rope, one end of which is connected to the first steel strand traction device, and the other end of the traction wire rope passes through the fixed pulley at the left steel strand duct end, the drum of the forward and reverse winch, the fixed pulley at the left adjustment end, the drum of the forward and reverse winch, the fixed pulley at the right adjustment end, the fixed pulley at the right steel strand duct end, the fixed pulley at the right tower column end and the fixed pulley at the left tower column end in sequence, and finally connects to the first steel strand traction device. The traction wire rope is also equipped with a second steel strand traction device, and when the first steel strand traction device is located at the lower end on the left, the second steel strand traction device is located at the upper end on the right.

[0014] In some embodiments, the telescopic tensioning device comprises:

[0015] A nylon sling, wherein the nylon sling is sleeved on the steel cable guide II;

[0016] A hand chain hoist, one end of which is hung on a nylon sling, and the other end is connected to an adjustable end fixed pulley.

[0017] In some embodiments, the winding method of the traction wire rope is:

[0018] The traction wire rope first passes around the fixed pulley at the left end of the wire rope guide and passes through the bottom of the fixed pulley at the left end of the wire rope guide;

[0019] Then wind one circle counterclockwise from left to right above the drum of the forward and reverse winch;

[0020] After the first circle is completed, pull the wire rope to the rear, pass it over the fixed pulley on the left side of the adjustment end on the same side, and then go in and out from the bottom;

[0021] The traction wire rope goes to the drum of the forward and reverse winch, enters from the bottom, winds several turns counterclockwise to the right, and comes out from the top of the drum of the forward and reverse winch;

[0022] The traction wire rope continues to go around the fixed pulley at the right adjustment end, passes through the top and goes out from the bottom; then the traction wire rope goes in from the bottom of the fixed pulley at the right cable guide end, turns and goes straight through the cable guide fixedly suspended at the top of the side;

[0023] The traction wire rope then passes around the fixed pulley at the right tower column end and the fixed pulley at the left tower column end, and then passes straight through the left cable guide tube to be connected to the first steel strand traction device.

[0024] In some embodiments, both ends of the second steel strand traction device are installed on the traction wire rope through rope clamps.

[0025] A construction method for a multi-hole traction system of a steel strand bundle of a high-tower double-cable-plane cable-stayed bridge comprises the following steps:

[0026] S1: Installation of multi-hole traction system for steel strand bundles of high tower column double cable plane cable-stayed bridge;

[0027] S2: Calculate and determine the length of the traction wire rope;

[0028] S3: Install the traction wire rope in place, and install the first steel strand traction device and the second steel strand traction device;

[0029] S4: Install two steel strands on the first steel strand puller;

[0030] S5: The forward and reverse hoists are turned on, and the first steel strand tractor pulls the two steel strands to the steel strand anchoring station of the inclined cable on the tower. The forward and reverse hoists are stopped, and then the steel strands are removed;

[0031] S6: When the left steel strand is transported to the position and parked, the second steel strand tractor has reached the steel strand traction installation working surface, and two steel strands are installed on the second steel strand tractor. After confirming that the worker above has removed the steel wire rope, the forward and reverse winches are controlled to rotate in the opposite direction, and then the right steel wire rope is pulled to the inclined cable steel strand anchoring station on the tower, completing a cycle of traction installation;

[0032] S7: Repeat the forward and reverse cycle of the winch until the auxiliary installation and traction work of all the steel strands in the cable hole is completed, and then tension and pre-tighten them one by one.

[0033] In some embodiments, in step S2,

[0034] The length of the traction wire rope is: the winding length of the forward and reverse winch L1 + the horizontal distance from the center of the forward and reverse winch to the bottom of the cable guide I L2×2 + the inclined straight-line distance from the bottom of the end inclined cable steel casing to the cable hole on the same side of the tower top L3×2 + the center distance between the two holes on the tower top L4 + the surplus amount L5.

[0035] In some embodiments, step S3 includes:

[0036] S31: Make a mark at the position of 1 / 2 of the total length of the left traction wire rope - (the distance from the top of the steel casing at the bottom of the tower to the center of the pulley on the same side of the tower L6 + L4 / 2), and then temporarily fix the end of the rope with a shorter distance to the marked position to the top of the first inclined cable steel casing closest to the tower column, leaving 1m;

[0037] S32: The other end of the left traction wire rope then goes around the fixed pulley at the left tower column end and comes out from the bottom of the fixed pulley at the left tower column end; it continues to wind counterclockwise from left to right above the forward and reverse winch turntable;

[0038] S33: After the first circle is completed, the rope head is pulled to the left adjustment end fixed pulley on the same side at the rear, and then passes through the upper part and goes out from the lower part;

[0039] S34: Continue to pull the rope head to the turntable of the forward and reverse winch, enter from the bottom and continue to wind several turns counterclockwise to the right, and record the number of winding turns q. When the rope is just wound onto the reel at the marked position, record the number of winding turns q1, then continue to wind q1-1 turns, and then wind out from the top of the forward and reverse winch;

[0040] S35: The rope head continues to go around the fixed pulley at the right adjustment end, passes through the upper part and goes out from the lower part; then the rope head goes around from the lower part of the fixed pulley at the right steel cable guide end, and after turning, the rope head goes straight along the cable guide fixedly suspended at the top of the same side, and then goes around the fixed pulley at the right tower column end of the tower top on the same side;

[0041] S36: passing through the right side of the fixed pulley at the left tower column end, turning, and then passing through the left cable duct in a straight line. During this process, the upper and lower fixed pulleys at the left cable duct end, the fixed pulley at the left tower column end, and the fixed pulley at the right cable duct end and the fixed pulley at the right tower column end are adjusted so that the straight wire rope passing through the cableway tube is close to the lower quadrant point of the circular section of the cable duct;

[0042] S37: Tighten both ends of the traction wire rope and clamp the two ends of the traction wire rope with the steel strand traction device using a rope clamp to complete the closure of the traction system, and then tighten the telescopic tensioning device to meet the transmission force conditions.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The operation is simple. The present invention utilizes the cable guide tube dual-path circulation traction system to realize a forward and reverse transmission operation cycle, and simultaneously completes the auxiliary traction work of the steel strand installation of the two cable guide tube pipelines, avoiding the no-load rotation of the winch traction equipment, and improving the use and construction efficiency of the cable threading machinery by 4 times, saving the construction period.

[0045] The steel strand puller with optimized design has a curved slide design and a linear transmission arrangement close to the bottom of the cable tube, which reduces the space occupied by the cable tube, prevents cutting, friction and damage to the cable tube, increases the smoothness of transmission and traction, and avoids entanglement with the upper cable, thereby improving the quality of cable threading.

[0046] The optimized excess length rope circulation design allows the traction wire rope to be cut according to the farthest working condition. When constructing the next hole, only the rope needs to be wound around the local pulley block, which makes the switching simple. This avoids the cost of steel strands of different cutting lengths at different hole positions and the additional cost of multiple rewinding.

[0047] The cable guide dual-channel circulation traction system is used to simultaneously complete the steel strand traction and installation work of two cable guide pipelines in one forward and reverse transmission operation cycle. The optimized excess length cable circulation design is used to carry out steel strand cutting according to the farthest working condition. When constructing the next hole, only the local pulley block needs to be wound through the cable to achieve the rapid conversion of the cable circulation traction system for the next hole. At the same time, the optimized double-strand cable traction device is used to increase the one-time steel strand traction and transportation efficiency. Combined with its curved slide design and the linear transmission arrangement close to the bottom of the cable guide, the space occupied by the cableway tube is reduced, cutting friction and damage to the cable guide are prevented, the smoothness of the transmission traction is increased, and at the same time, the twisting with the upper cable is avoided, which improves the cable threading quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the structure of the multi-hole traction system of the steel strand bundle of the high-tower double-cable-plane cable-stayed bridge;

[0049] Figure 2 This is an enlarged view of the bridge deck of the steel strand multi-hole traction system of the high-tower double-cable-plane cable-stayed bridge;

[0050] In the figure, 1.1-fixed pulley at the left side cable duct end, 1.2-fixed pulley 1.2 at the right side cable duct end, 2.1-fixed pulley at the left side tower column end, 2.2-fixed pulley at the right side tower column end, 3.1-fixed pulley at the left adjustment end, 3.2-fixed pulley at the right adjustment end, 4-forward and reverse winch, 5-traction wire rope, 6.1-first steel strand tractor, 6.2-second steel strand tractor, 7-cable duct I, 8-cable duct, 9-nylon sling, 10-hand winch, 11-cable duct II, 12-tower column, 13-steel strand. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] like Figure 1 As shown, a multi-hole traction system for steel strand bundles of a high-tower column double-cable plane cable-stayed bridge comprises:

[0053] Forward and reverse winch 4;

[0054] A fixed pulley at the end of the cable conduit, the fixed pulley at the end of the cable conduit is installed at the lower end of the cable conduit I7, and two fixed pulleys are provided at the end of the cable conduit, namely, a fixed pulley 1.1 at the left end of the cable conduit and a fixed pulley 1.2 at the right end of the cable conduit;

[0055] A tower column end fixed pulley, the tower column end fixed pulley is installed at the position of the tower column where the steel strand is to be fixed, and two tower column end fixed pulleys are provided, namely a left tower column end fixed pulley 2.1 and a right tower column end fixed pulley 2.2;

[0056] An adjusting end fixed pulley, the adjusting end fixed pulley is connected to the telescopic tensioning device, and two adjusting end fixed pulleys are provided, namely a left adjusting end fixed pulley 3.1 and a right adjusting end fixed pulley 3.2;

[0057] A traction wire rope 5, one end of which is connected to a first steel strand traction device 6.1, and the other end of the traction wire rope 5 passes through the fixed pulley 1.1 at the left side of the steel strand duct end, the drum of the forward and reverse winch 4, the fixed pulley 3.1 at the left side of the adjustment end, the drum of the forward and reverse winch 4, the fixed pulley 3.2 at the right side of the adjustment end, the fixed pulley 1.2 at the right side of the steel strand duct end, the fixed pulley 2.2 at the right side of the tower column end and the fixed pulley 2.1 at the left side of the tower column end, and finally connects to the first steel strand traction device 6.1. The traction wire rope 5 is also equipped with a second steel strand traction device 6.2, and when the first steel strand traction device 6.1 is located at the lower end on the left side, the second steel strand traction device 6.2 is located at the upper end on the right side.

[0058] The winding method of the traction wire rope 5 is:

[0059] The traction wire rope 5 first passes around the fixed pulley 1.1 at the left end of the wire rope guide tube, and passes out from the bottom of the fixed pulley 1.1 at the left end of the wire rope guide tube;

[0060] Then, wind one circle counterclockwise from left to right above the rotating drum of the forward and reverse winch 4;

[0061] After the first circle is completed, the wire rope 5 is pulled to the rear side and passed through the upper side of the fixed pulley 3.1 at the left side of the same side for adjustment and then wound out from the lower side;

[0062] The traction wire rope 5 goes to the drum of the forward and reverse hoist 4, enters from the bottom, winds several turns counterclockwise to the right, and comes out from the top of the drum of the forward and reverse hoist 4;

[0063] The traction wire rope 5 continues to go around the fixed pulley 3.2 at the right adjusting end, passes through the top and goes out from the bottom; then the traction wire rope 5 goes in from the bottom of the fixed pulley 1.2 at the right cable guide end, turns and goes straight through the cable guide 8 fixedly suspended at the top of the side;

[0064] The traction wire rope 5 then passes around the fixed pulley 2.2 at the right tower column end and the fixed pulley 2.1 at the left tower column end, and then passes straight through the left cable guide tube 8 to be connected to the first steel strand traction device 6.1.

[0065] The telescopic tensioning device includes:

[0066] A nylon sling 9, wherein the nylon sling 9 is sleeved on the steel cable guide II11;

[0067] A hand chain hoist 10, one end of which is hung on the nylon sling 9, and the other end is connected to the adjustable end fixed pulley.

[0068] A construction method for a multi-hole traction system of a steel strand bundle of a high-tower double-cable-plane cable-stayed bridge comprises the following steps:

[0069] S1: Installation of multi-hole traction system for steel strand bundles of high tower column double cable plane cable-stayed bridge.

[0070] By adopting the above system, various components are installed, holes are drilled at the bottom of two elliptical holes for cable insertion at the same height on the tower column, expansion bolts with ring hooks are implanted, and set pulleys are hung.

[0071] Expansion screws with ring hooks are implanted on the bottom beam surface of the steel casing at the two cable holes at the same mileage on the cast-in-place beam, and the pulleys and expansion bolt ring hooks are connected by steel ropes of appropriate length.

[0072] A winch with forward and reverse control and brake is installed on the middle beam surface of the front and rear rows of inclined cable steel casings at a certain distance from the ground pulley and is firmly fixed.

[0073] At a certain distance from the winch, two high-strength nylon sling rings are used to tie up the two inclined cable steel casings respectively, and a hand chain hoist is hung on the other end of the sling, and the other end of the hand chain hoist is connected to two fixed pulleys respectively.

[0074] S2: Calculate and determine the length of the traction wire rope 5.

[0075] The length of the traction wire rope 5 is: the minimum winding length L1 of the forward and reverse winch 4 + the horizontal distance L2×2 from the center of the forward and reverse winch 4 to the bottom of the cable guide tube I7 + the inclined straight-line distance L3×2 from the bottom of the end inclined cable steel casing to the cable hole on the same side of the tower top + the center distance L4 of the two holes on the tower top + the surplus amount L5 is 10m.

[0076] S3: Install the traction wire rope 5 in place, and install the first steel strand traction device 6.1 and the second steel strand traction device 6.2.

[0077] Step S3 includes:

[0078] S31: Make a mark at the position of 1 / 2 of the total length of the left traction wire rope - (the distance from the top of the steel casing at the bottom of the tower to the center of the pulley on the same side of the tower L6 + L4 / 2), and then temporarily fix the end of the rope with a smaller distance to the marked position to the top of the steel casing of the first inclined cable near the tower column, leaving 1m;

[0079] S32: The other end of the left traction wire rope then passes around the fixed pulley 2.1 at the left tower column end and comes out from the bottom of the fixed pulley 2.1 at the left tower column end; and continues to be wound counterclockwise from left to right above the turntable of the forward and reverse winch 4;

[0080] S33: After the first circle is completed, the rope head is pulled to the left adjustment end fixed pulley 3.1 on the same side at the rear, and passes through the upper part and then goes out from the lower part;

[0081] S34: Continue to pull the rope head to the turntable of the forward and reverse winch 4, enter from the bottom and continue to wind several turns counterclockwise to the right, and record the number of winding turns q. When the rope is just wound on the reel at the marked position, record the number of winding turns q1, then continue to wind q1-1 turns, and then wind out from the top of the forward and reverse winch 4;

[0082] S35: The rope head continues to go around the fixed pulley 3.2 at the right adjusting end, passes through the upper part and goes out from the lower part; then the rope head goes in from the lower part of the fixed pulley 1.2 at the right cable guide end, turns and passes in a straight line along the cable guide 8 fixedly suspended at the top of the same side, and then goes around the fixed pulley 2.2 at the right tower column end of the tower top at the same side;

[0083] S36: passing through the right side of the fixed pulley 2.1 at the left tower column end, turning, and then passing through the left cable duct in a straight line. During this process, the upper and lower fixed pulleys 1.1 at the left cable duct end, the fixed pulley 2.1 at the left tower column end, and the fixed pulleys 1.2 at the right cable duct end, and the fixed pulleys 2.2 at the right tower column end are adjusted so that the straight wire rope passing through the cable duct 8 is close to the lower quadrant point of the cable duct circular section;

[0084] S37: Tighten both ends of the traction wire rope and clamp the two ends of the traction wire rope with the steel strand traction device using a rope clamp to complete the closure of the traction system, and then tighten the telescopic tensioning device to meet the transmission force conditions.

[0085] S4: Install two steel strands 13 on the first steel strand traction device 6.1.

[0086] S5: The forward and reverse hoisting machine 4 is turned on, and the first steel strand tractor 6.1 pulls the two steel strands 13 to the inclined cable steel strand anchoring station on the tower, and the forward and reverse hoisting machine 4 is stopped, and then the steel strands 13 are removed.

[0087] S6: When the left steel strand 13 is transported to the position and parked, the second steel strand tractor 6.2 has reached the steel strand traction installation working surface, and two steel strands 13 are installed on the second steel strand tractor 6.2. After confirming that the workers above have removed the steel wire rope, the forward and reverse winches 4 are controlled to rotate in the opposite direction, and then the right steel wire rope is pulled to the inclined cable steel strand anchoring station on the tower, completing a cycle of traction installation.

[0088] S7: Repeat the forward and reverse cycle of the winch 4 until the auxiliary installation and traction work of all the steel strands at the cable hole is completed, and then tension and pre-tighten each strand.

[0089] Project Examples:

[0090] The traction system and construction method of the present invention have been successfully applied to multiple cable-stayed bridge construction projects of the applicant. The following is an example of the construction of the Beitongpu Railway Bridge over the East Extension of Xinyang Street and its supporting ancillary facilities in a certain county:

[0091] 1. Project Overview

[0092] The eastern extension of Xinyang Avenue is a main urban road in the core area of ​​Yangqu County. It starts from Shouyi Road in the west and ends at Shuangyang Road in the east. The road runs east-west, and an overpass scheme is adopted at the Yangqu railway station node.

[0093] The total length of the upper span bridge is 540m, with a design mileage range of K1+345.726~K1+885.726. The main bridge adopts a (2x150)m single-tower cable-stayed bridge with a bridge width of 26.18m. The main bridge adopts a single-row double-cable layout, with a horizontal spacing of 1.2m and a vertical spacing of 2m at the anchor points on the tower; the main beam anchorage area is located in the central isolation zone, with a horizontal spacing of 2.4m and a vertical spacing of 7m at the main beam. There are 76 cables in the whole bridge, and a total of 4732 steel strands need to be threaded, which requires a large amount of cable threading work.

[0094] 2. Application effect

[0095] The second section of the Xinyang Street East Extension crosses the Beitongpu Railway cable-stayed rotating bridge. The high-tower single-column cable-stayed bridge double-cable-plane cable-stayed double-hole circular cable-threading technology developed by the company has increased the cable-stayed steel strand threading and hanging cable construction efficiency by 4 times, shortening the original planned cable-stayed cable construction period from 60 days to 45 days. Compared with the traditional technology of single-hole circular cable-threading, which requires a complete set of circulation equipment, it saves a set of winches and cable-threading equipment and 6 manual configurations:

[0096] The total purchase cost of one set of traction equipment is about 3,800 yuan;

[0097] Labor cost: 500 yuan / day;

[0098] The daily construction and operation cost of the project is 12,000 yuan / d;

[0099] Therefore, compared with traditional technology, this technology saves a total of direct construction costs: 3800+ (500×6+12000)×15d=228,800 yuan, with obvious economic benefits.

[0100] Finally, it should be noted that the above 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 with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-hole traction system for steel strand bundles of a high-tower double-cable-plane cable-stayed bridge, characterized in that: include: Forward and reverse winch (4); A fixed pulley at the end of the cable conduit, the fixed pulley at the end of the cable conduit being mounted at the lower end of the cable conduit I (7), and two fixed pulleys at the end of the cable conduit are provided, namely a fixed pulley (1.1) at the left end of the cable conduit and a fixed pulley (1.2) at the right end of the cable conduit; A tower column end fixed pulley, the tower column end fixed pulley being installed at a position of the tower column where the steel strand is to be fixed, and two tower column end fixed pulleys are provided, namely a left tower column end fixed pulley (2.1) and a right tower column end fixed pulley (2.2); An adjusting end fixed pulley, the adjusting end fixed pulley is connected to the telescopic tensioning device, and two adjusting end fixed pulleys are provided, namely a left adjusting end fixed pulley (3.1) and a right adjusting end fixed pulley (3.2); A traction steel wire rope (5), one end of which is connected to a first steel strand traction device (6.1), and the other end of which passes through a fixed pulley (1.1) at a left steel strand guide tube end, a drum of a forward and reverse hoist (4), a fixed pulley (3.1) at a left adjustment end, a drum of a forward and reverse hoist (4), a fixed pulley (3.2) at a right adjustment end, a fixed pulley (1.2) at a right steel strand guide tube end, a fixed pulley (2.2) at a right tower column end, and a fixed pulley (2.1) at a left tower column end, and finally connected to the first steel strand traction device (6.1). The traction steel wire rope (5) is also provided with a second steel strand traction device (6.2), and when the first steel strand traction device (6.1) is located at a lower end on the left side, the second steel strand traction device (6.2) is located at an upper end on the right side; The construction method comprises the following steps: S1: Installation of multi-hole traction system for steel strand bundles of high tower column double cable plane cable-stayed bridge; S2: Calculate and determine the length of the traction wire rope (5); S3: Install the traction wire rope (5) in place, and install the first steel strand traction device (6.1) and the second steel strand traction device (6.2); S4: Install two steel strands (13) on the first steel strand traction device (6.1); S5: The forward and reverse hoisting machine (4) is turned on, and the first steel strand traction device (6.1) pulls the two steel strands (13) to the inclined cable steel strand anchoring station on the tower, and the forward and reverse hoisting machine (4) is stopped, and then the steel strands (13) are removed; S6: When the left steel strand (13) is transported to the position and parked, the second steel strand tractor (6.2) has reached the steel strand traction installation working surface, and two steel strands (13) are installed on the second steel strand tractor (6.2). After confirming that the worker above has removed the steel wire rope, the forward and reverse winch (4) is controlled to rotate in the opposite direction, and then the right steel wire rope is pulled to the inclined cable steel strand anchoring station on the tower, completing a cycle of traction installation; S7: Repeat the forward and reverse cycle of the winch (4) until the auxiliary installation and traction work of all the steel strands at the cable hole is completed, and then tension and pre-tighten each strand.

2. The multi-hole traction system for steel strand bundles of a high-tower double-cable-plane cable-stayed bridge according to claim 1 is characterized in that: The telescopic tensioning device comprises: A nylon sling (9), wherein the nylon sling (9) is sleeved on the steel cable guide tube II (11); A hand chain hoist (10), one end of which is hung on a nylon sling (9) and the other end of which is connected to an adjustable end fixed pulley.

3. The multi-hole traction system for steel strand bundles of high-tower double-cable-plane cable-stayed bridge according to claim 1 is characterized in that: The winding method of the traction wire rope (5) is: The traction wire rope (5) first passes around the fixed pulley (1.1) at the left end of the wire rope guide tube and passes out from the bottom of the fixed pulley (1.1) at the left end of the wire rope guide tube; Then, wind the drum of the forward and reverse winch (4) from left to right in a counterclockwise direction for one turn; After the first circle is completed, the wire rope (5) is pulled to the upper side of the left adjustment end fixed pulley (3.1) on the same side at the rear, passed through the lower side and then wound out; The traction wire rope (5) is then passed to the rotating drum of the forward and reverse hoist (4), enters from the bottom, is wound counterclockwise to the right for several turns, and is wound out from the top of the rotating drum of the forward and reverse hoist (4); The traction wire rope (5) continues to go around the fixed pulley (3.2) at the right adjustment end, passes through the top and goes out from the bottom; then the traction wire rope (5) goes in from the bottom of the fixed pulley (1.2) at the right cable guide end, turns and passes straight through the cable guide (8) fixedly suspended at the top of the side; The traction steel wire rope (5) then passes around the fixed pulley (2.2) at the right tower column end and the fixed pulley (2.1) at the left tower column end, and then passes straight through the left cable guide tube (8) to be connected to the first steel strand traction device (6.1).

4. The multi-hole traction system for steel strand bundles of a high-tower double-cable-plane cable-stayed bridge according to claim 1 is characterized in that: Both ends of the second steel strand traction device (6.2) are mounted on the traction steel wire rope (5) via rope clamps.

5. The multi-hole traction system for steel strand bundles of a high-tower double-cable-plane cable-stayed bridge according to claim 4 is characterized in that: In S2, The length of the traction wire rope (5) is: the winding length L1 of the forward and reverse hoist (4) + the horizontal distance L2×2 from the center of the forward and reverse hoist (4) to the bottom of the cable guide tube I (7) + the inclined straight line distance L3×2 from the bottom of the end inclined cable steel casing to the cable hole on the same side of the tower top + the center distance L4 of the two holes at the tower top + the surplus amount L5.

6. The multi-hole traction system for steel strand bundles of a high-tower column double-cable plane cable-stayed bridge according to claim 5 is characterized in that: The S3 includes: S31: Make a mark at the position of 1 / 2 of the total length of the left traction wire rope - (the distance from the top of the steel casing at the bottom of the tower to the center of the pulley on the same side of the tower L6 + L4 / 2), and then temporarily fix the end of the rope with a smaller distance to the marked position to the top of the first inclined cable steel casing closest to the tower column (12), leaving 1m of excess; S32: The other end of the left traction wire rope then passes around the fixed pulley (2.1) at the left tower column end and passes out from the bottom of the fixed pulley (2.1) at the left tower column end; and continues to be wound counterclockwise from left to right above the turntable of the forward and reverse winch (4); S33: After the first circle is completed, the rope head is pulled to the left adjustment end fixed pulley (3.1) on the same side at the rear, and then passed through the top and then wound out from the bottom; S34: Continue to pull the rope end onto the turntable of the forward and reverse hoist (4), enter from the bottom and continue to wind it counterclockwise to the right for several turns, and record the number of turns q. When the rope is just wound onto the reel at the marked position, record the number of turns q1, then continue to wind q1-1 turns, and then wind it out from the top of the forward and reverse hoist (4); S35: The rope head continues to go around the fixed pulley (3.2) at the right adjustment end, passes through the top and goes out from the bottom; the rope head then goes in from the bottom of the fixed pulley (1.2) at the right cable guide end, turns, passes in a straight line along the cable guide (8) fixedly suspended at the top of the same side, and then goes around the fixed pulley (2.2) at the right tower column end at the top of the tower on the same side; S36: passing through the right side of the fixed pulley (2.1) at the left tower column end, turning, and then passing through the left cable duct in a straight line. During this process, the upper and lower fixed pulleys (1.1) at the left cable duct end, the fixed pulley (2.1) at the left tower column end, and the fixed pulleys (1.2) at the right cable duct end and the fixed pulley (2.2) at the right tower column end are adjusted so that the straight wire rope passing through the cable duct (8) is close to the lower quadrant point of the cable duct circular section; S37: Tighten both ends of the traction wire rope and clamp the two ends of the traction wire rope with the steel strand traction device using a rope clamp to complete the closure of the traction system, and then tighten the telescopic tensioning device to meet the transmission force conditions.

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