Cable hanging construction method for sling tower of steel truss arch bridge

Abstract

The invention relates to a cable hanging construction method for a sling tower of a steel truss arch bridge, which comprises the following steps: mounting a tower top hanging bracket at the top end of the sling tower, and mounting a tower top cable traction system on the tower top hanging bracket; a bridge floor cable traction system is installed on an upper-layer bridge floor of the side-span steel beams, an arching frame beam crane is installed on the steel truss arch rib, and a front-end cable traction system is attached to the arching frame beam crane. A tower top cable traction system and a bridge floor cable traction system are used for respectively pulling the two ends of the side span sling, the tower top cable traction system and a front end cable traction system are used for respectively pulling the two ends of the midspan sling, and the midspan sling is temporarily hung on the steel truss arch rib and the sling tower; and finally, side span slings are anchored on the side span steel beams and the sling towers, and middle span slings are anchored on the steel truss arch ribs and the sling towers. The tower top cable traction system is installed on the tower top hanging bracket, tower end hanging of the side-span sling or the middle-span sling is carried out, and the problem that sling hanging cannot be carried out through a tower crane is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a method for constructing a cable hanging tower for a steel truss arch bridge. Background Art

[0002] Steel truss arch bridges, cables and towers are common engineering structures that can be used to build spanning structures such as rivers, canyons and roads. Steel truss arch bridges are truss structures composed of a series of steel materials to form an arc or arch span, which is used to support the bridge deck across both ends.

[0003] Steel truss arch bridges have the characteristics of high strength, good rigidity, light weight, fast construction and flexible design. The sling is a suspension structure used to carry loads, usually consisting of a series of steel cables suspended from towers or piers.

[0004] The sling has the characteristics of high strength, good rigidity and large carrying capacity. The tower is a structure used to support and fix steel truss arch bridges and slings. The tower is usually made of concrete or steel and has sufficient height and stability to support and transfer the load of the bridge or cable.

[0005] In the related art, when the side span slings and the middle span slings on both sides of the tower are hung, a tower crane is generally used to hang the slings on the top of the tower, and a beam surface winch is used to hang and tension the beam end. When the displacement of the sling tower is too large to make the tower crane unable to attach to the sling tower, or other reasons make the tower crane unusable, the hanging of the sling at the top of the tower becomes a problem.

[0006] The side span steel beams are hung at the beam ends by beam hoists, and the middle span steel beams are pulled and hung by the hoists attached to the beam erection cranes. In addition, during the installation of the middle span slings, when the first pair of slings are pulled and hung and the next pair of slings are pulled, the traction hoists need to be transferred to the anchor point of the next pair of slings and rewired, which is inconvenient to operate. Summary of the invention

[0007] The embodiment of the present application provides a method for hanging cables on a steel truss arch bridge cable tower to solve the problem in the related art that hanging cables on the top of the cable tower requires the aid of a tower crane, and when the cable tower is too far away from the tower crane, it is difficult to hang cables on the top of the cable tower.

[0008] The present application provides a method for constructing a steel truss arch bridge suspension tower cable hanging structure, the method comprising:

[0009] A cable tower is installed above the upper chord node of the steel truss at the top of the main pier, a tower top hanger is installed on the top of the cable tower, and a tower top cable traction system is installed on the tower top hanger;

[0010] A deck cable traction system is installed on the upper deck of the side span steel beam, and an arch beam crane is installed on the steel truss arch rib, wherein the arch beam crane is provided with a front-end cable traction system;

[0011] Deploy the side span sling on the upper bridge deck of the side span steel beam, use the tower top cable traction system and the bridge deck cable traction system to pull the two ends of the side span sling respectively, and temporarily hang the side span sling on the side span steel beam and the sling tower;

[0012] Deploy the middle span sling on the upper deck of the side span steel beam, use the tower top cable traction system and the front end cable traction system to pull the two ends of the middle span sling respectively, and temporarily hang the middle span sling on the steel truss arch rib and the sling tower;

[0013] After the side span cables and the middle span cables are tensioned synchronously and symmetrically in stages, the side span cables are anchored to the side span steel beams and the cable towers, and the middle span cables are anchored to the steel truss arch ribs and the cable towers. The next pair of side span cables and middle span cables are towed, hung and anchored according to the above steps.

[0014] In some embodiments, the method further comprises:

[0015] A traction rope reversing mechanism is also installed on the tower top hanger, and the traction rope reversing mechanism is used to wind the traction rope of the tower top cable traction system;

[0016] When the tower top cable traction system tractions the side span sling, the traction rope reversing mechanism reversing the traction rope of the tower top cable traction system to the side span side to traction the side span sling;

[0017] When the tower top cable traction system pulls the mid-span sling, the traction rope switching mechanism switches the traction rope of the tower top cable traction system to the mid-span side to pull the mid-span sling.

[0018] In some embodiments, the traction rope reversing mechanism includes a first horizontal pulley and a second horizontal pulley both arranged horizontally, and a first vertical pulley and a second vertical pulley both arranged vertically;

[0019] The first horizontal pulley and the second horizontal pulley are spaced apart along the transverse direction of the bridge, and the first vertical pulley and the second vertical pulley are spaced apart along the longitudinal direction of the bridge.

[0020] In some embodiments, the first horizontal pulley and the tower top cable traction system are both spaced apart from the central axis of the bridge greater than the spacing between the second horizontal pulley, the first vertical pulley, and the second vertical pulley and the central axis of the bridge;

[0021] The first vertical pulley and the second vertical pulley are located on both sides of the second horizontal pulley along the longitudinal bridge direction;

[0022] When the traction rope of the tower top cable traction system passes through the first horizontal pulley, the second horizontal pulley and the first vertical pulley in sequence, it is used to pull the side span suspension rope;

[0023] The traction rope of the tower top cable traction system is used to traction the mid-span suspension cable after it passes through the first horizontal pulley, the second horizontal pulley and the second vertical pulley in sequence.

[0024] In some embodiments, a plurality of cable guide slides are installed on the upper bridge deck of the side span steel beam and the steel truss arch rib, and the plurality of cable guide slides are arranged at intervals along the longitudinal direction of the bridge and symmetrically arranged on both sides of the steel truss arch bridge;

[0025] The upper deck of the side span steel beam is provided with a cable tray, and the cable tray is located at the end of the plurality of cable guide slides and is far away from the steel truss arch rib;

[0026] The side span slings and the middle span slings are both released from the cable release drum and then slidably pulled by the tower top cable traction system or the front end cable traction system on the cable guide slide.

[0027] In some embodiments, the top of the suspension tower is installed with a tower top side span anchor and a tower top mid-span anchor, the side span steel beam is installed with a beam end side span anchor, and the steel truss arch rib is installed with an arch rib mid-span anchor;

[0028] One end of the side span sling is anchored to the side span anchor at the tower top, one end of the side span sling is anchored to the side span anchor at the beam end, one end of the middle span sling is anchored to the middle span anchor at the tower top, and the other end of the middle span sling is anchored to the arch rib middle span anchor.

[0029] In some embodiments, the tower top cable traction system, the bridge deck cable traction system and the front end cable traction system are all winches.

[0030] In some embodiments, the mid-span slings and the side-span slings are each provided with three layers, and the three layers of the mid-span slings and the three layers of the side-span slings are symmetrically tensioned and anchored from the inside to the outside.

[0031] In some embodiments, when installing the sling tower and towing, hanging and anchoring the side span slings and the middle span slings, the two banks can be constructed symmetrically and synchronously.

[0032] In some embodiments, the arch beam crane drives the front cable traction system on the steel truss arch rib to move synchronously along the longitudinal direction of the bridge.

[0033] The beneficial effects of the technical solution provided by this application include:

[0034] The embodiment of the present application provides a method for hanging cables on a steel truss arch bridge suspension tower. According to the method for hanging cables on a steel truss arch bridge suspension tower of the present application, first, a suspension tower is installed above the upper chord node of the steel truss beam at the top of the main pier, a tower top hanger is installed at the top of the suspension tower, and a tower top cable traction system is installed on the tower top hanger; secondly, a deck cable traction system is installed on the upper bridge deck of the side span steel beam, an arch beam crane is installed on the steel truss arch rib, and a front-end cable traction system is attached to the arch beam crane; then, the side span suspension cable is deployed on the upper bridge deck of the side span steel beam, and the tower top cable traction system and the bridge deck cable are used to pull the side span suspension cable from the upper bridge deck to the upper bridge deck. The traction system pulls the two ends of the side span cables respectively, and temporarily hangs the side span cables on the side span steel beams and the cable towers; next, the middle span cables are deployed on the upper bridge deck of the side span steel beams, and the two ends of the middle span cables are pulled respectively by the tower top cable traction system and the front end cable traction system, and the middle span cables are temporarily hung on the steel truss arch ribs and the cable towers; finally, after the side span cables and the middle span cables are tensioned synchronously and symmetrically in stages, the side span cables are anchored on the side span steel beams and the cable towers, and the middle span cables are anchored on the steel truss arch ribs and the cable towers, and the next pair of side span cables and middle span cables are pulled, hung and anchored according to the above steps.

[0035] Therefore, the cable hanging construction method for the cable tower of the steel truss arch bridge of the present application installs a tower top hanger on the top of the cable tower in advance, installs a tower top cable traction system on the tower top hanger, and lowers the steel wire rope from the tower top cable traction system to connect with the side span cable or the middle span cable on the upper bridge deck of the side span steel beam, and hangs the tower end of the side span cable or the middle span cable, which effectively solves the problem of not being able to use a tower crane for cable hanging. The arch beam crane is installed on the steel truss arch rib, and the arch beam crane is equipped with a front-end cable traction system. The front-end cable traction system can pull and hang the middle span cable. The front-end cable traction system can automatically move forward with the arch beam crane, and there is no need to transport the front-end cable traction system separately and rewire, which is easy to operate. After temporarily hanging the side span slings on the side span steel beams and sling towers, and temporarily hanging the middle span slings on the steel truss arch ribs and sling towers, the side span slings and middle span slings are tensioned synchronously and symmetrically in stages to complete the cable hanging construction of the sling towers. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is a schematic diagram of the structure of step S10 in the embodiment of the present application;

[0038] Figure 2This is a schematic diagram of the structure of step S20 in the embodiment of the present application;

[0039] Figure 3 This is a schematic diagram of the structure of step S30 in the embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of the structure of step S40 in the embodiment of the present application;

[0041] Figure 5 This is a schematic diagram of the structure of step S50 in the embodiment of the present application;

[0042] Figure 6 This is a structural front view of the top cable traction system of the embodiment of the present application for hanging the side span sling;

[0043] Figure 7 A top view of the structure of the top cable traction system of the embodiment of the present application with the side span sling hanging;

[0044] Figure 8 This is a structural front view of the top cable traction system of the embodiment of the present application for hanging the mid-span sling;

[0045] Fig. 9 This is a top view of the structure of the mid-span sling hanging system of the top cable traction system in the embodiment of the present application.

[0046] Reference numerals:

[0047] 1. Main pier; 2. Steel truss; 3. Cable tower; 4. Tower top hanger; 5. Tower top cable traction system; 6. Side span steel beam; 7. Bridge deck cable traction system; 8. Arch beam crane; 9. Front end cable traction system; 10. Cable guide slide; 11. Side span sling; 12. Middle span sling; 13. First horizontal pulley; 14. Second horizontal pulley; 15. First vertical pulley; 16. Second vertical pulley; 17. Tower top side span anchor; 18. Tower top middle span anchor; 19. Beam end side span anchor; 20. Arch rib middle span anchor. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] The embodiment of the present application provides a method for hanging cables on a steel truss arch bridge cable tower, which can solve the problem in the related art that hanging cables on the top of the cable tower requires the aid of a tower crane, and when the cable tower is too far away from the tower crane, it is difficult to hang cables on the top of the cable tower.

[0050] See also Figures 1 to 9 As shown, the embodiment of the present application provides a method for hanging cables on a steel truss arch bridge suspension tower, the method comprising the following steps:

[0051] S10, installing a cable tower 3 above the upper chord node of the steel truss 2 at the pier top of the main pier 1, installing a tower top hanger 4 at the top of the cable tower 3, and installing a tower top cable traction system 5 on the tower top hanger 4.

[0052] S20, a deck cable traction system 7 is installed on the upper deck of the side span steel beam 6, and an arch beam erection crane 8 is installed on the steel truss arch rib. The arch beam erection crane 8 is used to erect the steel truss arch rib, and the arch beam erection crane 8 is provided with a front-end cable traction system 9.

[0053] S30, deploy the side span suspension cable 11 on the upper bridge deck of the side span steel beam 6, use the tower top cable traction system 5 and the bridge deck cable traction system 7 to pull the two ends of the side span suspension cable 11 respectively, and temporarily hang the side span suspension cable 11 on the side span steel beam 6 and the suspension cable tower 3.

[0054] S40, deploy the middle span sling 12 on the upper bridge deck of the side span steel beam 6, use the tower top cable traction system 5 and the front end cable traction system 9 to pull the two ends of the middle span sling 12 respectively, and temporarily hang the middle span sling 12 on the steel truss arch rib and the sling tower 3.

[0055] S50, after the side span slings 11 and the middle span slings 12 are tensioned synchronously and symmetrically in stages, the side span slings 11 are anchored to the side span steel beams 6 and the sling tower 3, and the middle span slings 12 are anchored to the steel truss arch ribs and the sling tower 3;

[0056] S60, repeat the above steps S30 to S50 to pull, hang and anchor the next pair of side span slings 11 and middle span slings 12.

[0057] The steel truss arch bridge cable tower hanging cable construction method of the embodiment of the present application is to install a tower top hanger 4 on the top of the cable tower 3 in advance, and install a tower top cable traction system 5 on the tower top hanger 4. The tower top cable traction system 5 lowers the steel wire rope to connect with the side span cable 11 or the middle span cable 12 on the upper bridge deck of the side span steel beam 6, and hangs the side span cable 11 or the middle span cable 12 at the tower end, which effectively solves the problem that the tower crane cannot be used for cable hanging.

[0058] By making use of the existing arch beam crane 8 installed on the steel truss arch rib, the arch beam crane 8 is equipped with a front-end cable traction system 9, which can pull and hang the mid-span sling 12. The front-end cable traction system 9 can automatically move forward following the arch beam crane 8, and there is no need to separately transport the front-end cable traction system 9 and rewire, which is easy to operate.

[0059] After temporarily hanging the side span sling 11 on the side span steel beam 6 and the sling tower 3, and temporarily hanging the middle span sling 12 on the steel truss arch rib and the sling tower 3, the side span sling 11 and the middle span sling 12 are tensioned and anchored synchronously and symmetrically in stages to complete the cable hanging construction on the sling tower 3 without using a tower crane.

[0060] In some alternative embodiments, see Figures 7 to 9 As shown, the application embodiment provides a method for hanging cables on a steel truss arch bridge suspension tower, wherein S10 of the method further includes the following steps:

[0061] A traction rope reversing mechanism is also installed on the tower top hanger 4, and the traction rope reversing mechanism is used to wind the traction rope of the tower top cable traction system 5; when the tower top cable traction system 5 pulls the side span sling 11, the traction rope reversing mechanism switches the traction rope of the tower top cable traction system 5 to the side span side to pull the side span sling 11. When the tower top cable traction system 5 pulls the middle span sling 12, the traction rope reversing mechanism switches the traction rope of the tower top cable traction system 5 to the middle span side to pull the middle span sling 12.

[0062] Specifically, the traction rope reversing mechanism includes a first horizontal pulley 13 and a second horizontal pulley 14 both arranged horizontally, and a first vertical pulley 15 and a second vertical pulley 16 both arranged vertically. The first horizontal pulley 13 and the second horizontal pulley 14 are arranged at intervals along the transverse direction of the bridge, and the first vertical pulley 15 and the second vertical pulley 16 are arranged at intervals along the longitudinal direction of the bridge.

[0063] The first horizontal pulley 13 is located at the front end of the tower top cable traction system 5. The distance between the first horizontal pulley 13 and the tower top cable traction system 5 and the central axis of the bridge is greater than the distance between the second horizontal pulley 14, the first vertical pulley 15 and the second vertical pulley 16 and the central axis of the bridge, so that the traction rope of the tower top cable traction system 5 can avoid the tower top cable traction system 5 after switching.

[0064] The first vertical pulley 15 and the second vertical pulley 16 are located on both sides of the second horizontal pulley 14 along the longitudinal bridge direction. When the traction rope of the tower top cable traction system 5 passes through the first horizontal pulley 13, the second horizontal pulley 14 and the first vertical pulley 15 in sequence, it is used to pull the side span sling 11; when the traction rope of the tower top cable traction system 5 passes through the first horizontal pulley 13, the second horizontal pulley 14 and the second vertical pulley 16 in sequence, it is used to pull the middle span sling 12.

[0065] In some alternative embodiments, see Figures 1 to 5 As shown, an embodiment of the application provides a method for hanging cables on a steel truss arch bridge suspension tower, in which a plurality of cable guide slides 10 are installed on the upper bridge deck of the side span steel beam 6 and the steel truss arch rib, and the plurality of cable guide slides 10 are spaced apart along the longitudinal direction of the bridge and symmetrically arranged on both sides of the steel truss arch bridge.

[0066] The upper deck of the side span steel beam 6 is provided with a cable release tray, which is located at the end of a plurality of cable guide slides 10 and away from the steel truss arch rib. After being released from the cable release tray, the side span sling 11 and the middle span sling 12 are pulled and slid on the cable guide slide 10 by the tower top cable traction system 5 or the front end cable traction system 9, thereby reducing the resistance of the tower top cable traction system 5 or the front end cable traction system 9 in pulling the side span sling 11 or the middle span sling 12.

[0067] In some alternative embodiments, see Figure 1 , Figure 2 , Figure 7 and Fig. 9 As shown, the application embodiment provides a method for hanging cables on a steel truss arch bridge suspension tower, in which a tower top side span anchor 17 and a tower top mid-span anchor 18 are installed on the top of the suspension tower 3, a beam end side span anchor 19 is installed on the side span steel beam 6, and an arch rib mid-span anchor 20 is installed on the steel truss arch rib.

[0068] One end of the side span cable 11 is anchored to the side span anchor 17 at the tower top, one end of the side span cable 11 is anchored to the side span anchor 19 at the beam end, one end of the middle span cable 12 is anchored to the middle span anchor 18 at the tower top, and the other end of the middle span cable 12 is anchored to the arch rib middle span anchor 20.

[0069] In the above, the tower top cable traction system 5, the bridge deck cable traction system 7 and the front end cable traction system 9 are all winches. The middle span sling 12 and the side span sling 11 are both provided with three layers, and the three layers of the middle span sling 12 and the three layers of the side span sling 11 are symmetrically tensioned and anchored from the inside to the outside to improve the structural stability of the sling tower 3.

[0070] When installing the cable tower 3, and traction, hanging and anchoring the side span cable 11 and the middle span cable 12, the two sides can be constructed symmetrically and synchronously. The arch beam crane 8 drives the front cable traction system 9 on the steel truss arch rib to move synchronously along the longitudinal bridge direction, without the need to transport the front cable traction system 9 separately and re-wire, which is easy to operate.

[0071] How it works

[0072] The embodiment of the present application provides a method for hanging cables of a steel truss arch bridge suspension tower. According to the method for hanging cables of a steel truss arch bridge suspension tower of the present application, firstly, a suspension tower 3 is installed above the upper chord node of the steel truss beam 2 at the top of the main pier 1, a tower top hanger 4 is installed at the top of the suspension tower 3, and a tower top cable traction system 5 is installed on the tower top hanger 4;

[0073] Secondly, a deck cable traction system 7 is installed on the upper deck of the side span steel beam 6, and an arch beam crane 8 is installed on the steel truss arch rib, and the arch beam crane 8 is equipped with a front-end cable traction system 9; then, a side span sling 11 is deployed on the upper deck of the side span steel beam 6, and the tower top cable traction system 5 and the deck cable traction system 7 are used to pull the two ends of the side span sling 11 respectively, and the side span sling 11 is temporarily hung on the side span steel beam 6 and the sling tower 3;

[0074] Next, deploy the middle span cable 12 on the upper bridge deck of the side span steel beam 6, use the tower top cable traction system 5 and the front end cable traction system 9 to pull the two ends of the middle span cable 12 respectively, and temporarily hang the middle span cable 12 on the steel truss arch rib and the cable tower 3; finally, after the side span cables 11 and the middle span cables 12 are tensioned synchronously and symmetrically in stages, the side span cables 11 are anchored on the side span steel beam 6 and the cable tower 3, and the middle span cables 12 are anchored on the steel truss arch rib and the cable tower 3, and the next pair of side span cables 11 and middle span cables 12 are towed, hung and anchored according to the above steps.

[0075] Therefore, the steel truss arch bridge cable tower hanging cable construction method of the present application installs a tower top hanger 4 on the top of the cable tower 3 in advance, and installs a tower top cable traction system 5 on the tower top hanger 4. The tower top cable traction system 5 lowers the steel wire rope to connect with the side span cable 11 or the middle span cable 12 on the upper bridge deck of the side span steel beam 6, and hangs the side span cable 11 or the middle span cable 12 at the tower end, which effectively solves the problem of not being able to use a tower crane for cable hanging.

[0076] An arch beam crane 8 is installed on the steel truss arch rib. The arch beam crane 8 is equipped with a front-end cable traction system 9. The front-end cable traction system 9 can pull and hang the mid-span sling 12. The front-end cable traction system 9 can automatically move forward following the arch beam crane 8. There is no need to separately transport the front-end cable traction system 9 and rewire, and the operation is convenient.

[0077] After the side span slings 11 are temporarily hung on the side span steel beams 6 and the sling tower 3, and the middle span slings 12 are temporarily hung on the steel truss arch ribs and the sling tower 3, the side span slings 11 and the middle span slings 12 are tensioned synchronously and symmetrically in stages to complete the cable hanging construction work of the sling tower 3.

[0078] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0079] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0080] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for hanging cables on a steel truss arch bridge sling tower, characterized in that: The method comprises: A cable tower (3) is installed above the upper chord node of the steel truss (2) at the top of the main pier (1), a tower top hanger (4) is installed at the top of the cable tower (3), and a tower top cable traction system (5) is installed on the tower top hanger (4); A deck cable traction system (7) is installed on the upper deck of the side span steel beam (6), and an arch beam crane (8) is installed on the steel truss arch rib, wherein the arch beam crane (8) is provided with a front-end cable traction system (9); Deploy a side span sling (11) on the upper bridge deck of the side span steel beam (6), use a tower top cable traction system (5) and a bridge deck cable traction system (7) to pull the two ends of the side span sling (11) respectively, and temporarily hang the side span sling (11) on the side span steel beam (6) and the sling tower (3); Deploy a middle span sling (12) on the upper deck of the side span steel beam (6), use the tower top cable traction system (5) and the front end cable traction system (9) to pull the two ends of the middle span sling (12) respectively, and temporarily hang the middle span sling (12) on the steel truss arch rib and the sling tower (3); After the side span slings (11) and the middle span slings (12) are tensioned synchronously and symmetrically in stages, the side span slings (11) are anchored to the side span steel beams (6) and the sling tower (3), and the middle span slings (12) are anchored to the steel truss arch ribs and the sling tower (3). The next pair of side span slings (11) and middle span slings (12) are towed, hung and anchored according to the above steps.

2. A steel truss arch bridge suspension tower cable hanging construction method as claimed in claim 1, characterized in that: The method further comprises: A traction rope reversing mechanism is also installed on the tower top hanger (4), and the traction rope reversing mechanism is used to wind the traction rope of the tower top cable traction system (4); When the tower top cable traction system (5) tractions the side span sling (11), the traction rope reversing mechanism reversing the traction rope of the tower top cable traction system (5) to the side span side to traction the side span sling (11); When the tower top cable traction system (5) tractions the mid-span sling (12), the traction rope reversing mechanism reversing the traction rope of the tower top cable traction system (5) to the mid-span side to traction the mid-span sling (12).

3. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 2, characterized in that: The traction rope reversing mechanism comprises a first horizontal pulley (13) and a second horizontal pulley (14) both arranged horizontally, and a first vertical pulley (15) and a second vertical pulley (16) both arranged vertically; The first horizontal pulley (13) and the second horizontal pulley (14) are arranged at intervals along the transverse direction of the bridge, and the first vertical pulley (15) and the second vertical pulley (16) are arranged at intervals along the longitudinal direction of the bridge.

4. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 3, characterized in that: The distances between the first horizontal pulley (13) and the tower top cable traction system (5) and the central axis of the bridge are greater than the distances between the second horizontal pulley (14), the first vertical pulley (15) and the second vertical pulley (16) and the central axis of the bridge; The first vertical pulley (15) and the second vertical pulley (16) are located on both sides of the second horizontal pulley (14) along the longitudinal bridge direction; After the traction rope of the tower top cable traction system (5) passes through the first horizontal pulley (13), the second horizontal pulley (14) and the first vertical pulley (15) in sequence, it is used to traction the side span suspension rope (11); After the traction rope of the tower top cable traction system (5) passes through the first horizontal pulley (13), the second horizontal pulley (14) and the second vertical pulley (16) in sequence, it is used to pull the mid-span suspension cable (12).

5. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 1, characterized in that: A plurality of cable guide slides (10) are installed on the upper bridge deck and the steel truss arch rib of the side span steel beam (6), and the plurality of cable guide slides (10) are arranged at intervals along the longitudinal direction of the bridge and symmetrically on both sides of the steel truss arch bridge; The upper deck of the side span steel beam (6) is provided with a cable release tray, and the cable release tray is located at the end of the plurality of cable guide slides (10) and is far away from the steel truss arch rib; The side span sling (11) and the middle span sling (12) are both released from the cable release drum and then pulled and slid on the cable guide slide (10) by the tower top cable traction system (5) or the front end cable traction system (9).

6. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 1, characterized in that: The top of the suspension tower (3) is equipped with a tower top side span anchor (17) and a tower top mid-span anchor (18), the side span steel beam (6) is equipped with a beam end side span anchor (19), and the steel truss arch rib is equipped with an arch rib mid-span anchor (20); One end of the side span sling (11) is anchored to the side span anchor (17) at the tower top, one end of the side span sling (11) is anchored to the side span anchor (19) at the beam end, one end of the middle span sling (12) is anchored to the middle span anchor (18) at the tower top, and the other end of the middle span sling (12) is anchored to the arch rib middle span anchor (20).

7. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 1, characterized in that: The tower top cable traction system (5), the bridge deck cable traction system (7) and the front end cable traction system (9) are all winches.

8. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 1, characterized in that: The middle span sling (12) and the side span sling (11) are both provided with three layers, and the three layers of the middle span sling (12) and the three layers of the side span sling (11) are symmetrically tensioned and anchored from the inside to the outside.

9. A method for hanging cables on a steel truss arch bridge sling tower as claimed in claim 1, characterized in that: When the sling tower (3) is installed, and the side span slings (11) and the middle span slings (12) are towed, hung and anchored, the two banks can be constructed symmetrically and synchronously.

10. A steel truss arch bridge suspension tower cable hanging construction method as claimed in claim 1, characterized in that: The arch beam crane (8) drives the front end cable traction system (9) on the steel truss arch rib to move synchronously along the longitudinal direction of the bridge.

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