Construction method of single-tower single-span ground anchor type rotary cable suspension bridge steel truss girder

Abstract

The invention discloses a construction method of a single-tower single-span ground anchor type rotary cable suspension bridge steel truss girder, which comprises the following steps: S1, mounting a suspension bridge main tower and a temporary tower on two sides, and then mounting a rotary cable with a cable crane; s2, after assembling of the steel truss girders is completed, the steel truss girders are transported section by section in a tire-free mode through a full-rotation module vehicle and rotated in place; s3, hoisting and erecting the whole section of steel truss girder to a preset position through a cable crane, and connecting the whole section of steel truss girder with the adjacent steel truss girder through a temporary hinge device; s4, after the integral hoisting of the steel truss girder is completed, rigid-hinge conversion is carried out, and the temporary hinge device is cut off; and S5, the horizontal distance, the height difference and the relative rotating angle of a closure opening of the steel truss girder are adjusted at the root of the bridge tower, butt welding seams are synchronously welded, and steel truss girder whole-section main span closure is completed. According to the method, the situation that a cable crane anchorage is arranged on a mountain is avoided, the cable crane span is reduced, meanwhile, damage of a temporary anchor body to the mountain is avoided, the measure force of rigid-hinge conversion can be reduced, use of large equipment is avoided, and the construction difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method for a steel truss beam of a single-tower and single-span ground-anchored revolving cable suspension bridge. Background Art

[0002] A suspension bridge usually has a main cable on each side of the bridge, which is anchored on the anchorage structures on the left and right sides and the anchorage structure on the top of the tower, and is connected to the anchorage and the bridge tower as a whole. Suspension bridges are generally divided into single-span, two-span, three-span and multi-tower multi-span suspension bridges according to the number of suspended spans. Among them, the single-tower single-span suspension bridge is suitable for the side span with a higher ground and uses a pier to support the side span.

[0003] The application of revolving cables in suspension bridges has its own unique form and importance. Generally, the main cable starts from an anchorage on one bank, goes around the anchorage on the opposite bank, and then returns and anchors to the main cable at the anchorage on the starting bank. This design can make full use of the constant load self-balancing characteristics of the main cable and optimize the anchoring structure and anchoring structure.

[0004] In the conventional construction method of steel trusses of suspension bridges, a cable crane with a rotating hoist is generally used to lift and erect the entire section of the stiffening beam of the suspension bridge in one direction. This requires the beam to be rotated first, which increases the working hours of the process. At the same time, in the steep canyon terrain conditions in mountainous areas, the cable crane is used to lift the stiffening beam of the suspension bridge. The load-bearing cables are anchored in the mountain. There are also problems such as the large span of the cable crane, the long time and investment required to drill for a suitable anchoring area, and the damage to the mountain during the anchor construction.

[0005] To this end, the present application proposes a construction method for a steel truss beam of a single-tower single-span ground-anchored revolving cable suspension bridge to solve the above technical problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a construction method for a single-tower and single-span ground-anchored revolving cable suspension bridge steel truss. Through the one-way erection technology, it is avoided to set up assembly sites on both sides of the canyon, thereby reducing the construction cost. The whole section of the steel truss tower root is rotated using a fully revolving modular vehicle, which improves the transportation efficiency in the canyon and mountainous areas. The cable tower and anchor of the suspension bridge itself are used as the support and anchoring device of the cable crane, avoiding the installation of cable crane anchors on the mountain, reducing the span of the cable crane and avoiding the damage of the temporary anchor to the mountain, so as to solve the above-mentioned technical problems.

[0007] The present invention adopts the following technical solutions to solve the above technical problems:

[0008] A construction method for a steel truss beam of a single-tower single-span ground-anchored revolving cable suspension bridge, comprising:

[0009] S1. Install the main tower and temporary tower of the suspension bridge on both sides, and then install the slewing cable with cable hanger;

[0010] S2. After the steel trusses are assembled, use a fully revolving modular vehicle to transport the steel trusses section by section and rotate them into place, waiting for the entire section of the steel trusses to be lifted;

[0011] S3. The entire segment of steel trusses is hoisted and erected to the preset position by cable cranes and connected to adjacent steel trusses by temporary articulated devices;

[0012] S4. After the overall hoisting of the steel truss is completed, the rigid-hinged conversion is carried out and the temporary hinge device is cut off;

[0013] S5. Adjust the horizontal spacing, height difference and relative rotation angle of the steel truss joint at the base of the bridge tower, weld the butt welds simultaneously, and complete the main span closure of the entire steel truss segment.

[0014] Preferably, the specific process of step S1 includes:

[0015] S11. Install the rotary anchor on one side and the tower side gravity anchor and tower pile foundation cap on the other side;

[0016] S12. Assemble the temporary tower and install the main tower on the bridge tower pile foundation;

[0017] S13. After the main tower construction is completed, install the temporary saddle and temporary traction system, which consists of the main cable wind cable traction cable and lifting cable.

[0018] Preferably, after the execution of step S1, an auxiliary bracket needs to be installed at the bottom of the main tower of the suspension bridge for installing the steel truss segment at the root of the tower.

[0019] Preferably, the installation process of the auxiliary support specifically includes: fixing the embedded parts on the steel bars of the bridge tower foundation, and casting them together with the bridge tower foundation by using a cast-in-place concrete independent foundation method to obtain the auxiliary support foundation;

[0020] The auxiliary support is installed by a car crane, the auxiliary support columns are made of spiral welded pipes, the columns are connected by steel pipes, and the steel pipes are connected by welding.

[0021] Preferably, the specific operation process of removing the steel truss from the mold, transporting it, and rotating it into place in step S2 includes:

[0022] S21. After the steel truss is assembled, the large-segment steel truss is removed by using the lifting function of the fully rotating module vehicle, and when the steel truss is stored, the large-segment steel truss is dropped onto the beam storage rack by the fully rotating module vehicle;

[0023] S22. Use the fully revolving module vehicle to rotate the steel truss on the beam storage rack by 90 degrees and then drive it along the transport channel to the base of the bridge tower;

[0024] S23. After the steel truss is moved into position, it is rotated into position along the rotation centerline, and the full-rotation module vehicle moves toward the mid-span direction to the bottom of the cable crane.

[0025] Preferably, the specific erection process of the whole segment steel truss in step S3 includes:

[0026] S31. Before erecting the steel truss, place permanent supports on the slewing anchors;

[0027] S32. The cable crane hoisting start section is hoisted from the working platform at the root of the main tower. During the hoisting process, the steel beam is transported under the main cable. After being hoisted to the installation position, the end of the steel beam is dropped on the permanent support and the other end is connected to the hoisting cable. After the connection is completed, the steel truss beam and the anchor are temporarily longitudinally limited;

[0028] S33. The cable crane hoists the next section of standard steel beam on the working platform. After the hoisting is completed, it is transported to the installation position under the main cable of the slewing cable. The sling is connected to the steel beam. The erected steel beam section is hinged with the installed beam section through a temporary hinge device using a pin shaft;

[0029] S34. Construct the temporary connection pins at the joints of the steel beams. After completing the temporary connection of the steel beams, release the hook with the cable and proceed with the hoisting of the next beam section.

[0030] Preferably, during the rigid-hinge conversion process in step S4, a finite element simulation analysis is also performed on the hoisting process of the steel truss of the suspension bridge, and during the hoisting process, adjacent segments of the previously hoisted segments are rigidly connected in sequence according to the calculation results and on-site monitoring data to form a relatively stable unit.

[0031] Preferably, the specific operation process of closing the main span of the entire steel truss segment in step S5 includes:

[0032] S51. Install a three-dimensional jack at the bottom of the steel truss on the side of the main tower;

[0033] S52. The steel truss girder segment at the base of the bridge tower is initially in a horizontal state and then adjusted to a preset posture;

[0034] S53. After all steel truss girder segments are hoisted, installed and rigidly connected, the measured linear shapes of the steel beams at both ends of the joint are compared with the values ​​calculated by finite element analysis. The 3D jacks are used to longitudinally move and lift the segments at the base of the bridge towers in sequence, and the horizontal spacing, height difference and relative rotation angle of the joint are adjusted respectively to eliminate the relative height difference and rotation angle of the joint.

[0035] S54.Simultaneously weld the butt welds to complete the main span closure.

[0036] The invention provides a construction method for a steel truss beam of a single-tower single-span ground-anchored revolving cable suspension bridge.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The method of the present invention can meet the hoisting requirements of the entire section of the steel truss through the setting of the large height difference cable crane, improve the efficiency of the steel truss segment erection, shorten the construction period, and at the same time reduce the height of the cable tower, save the engineering workload of the cable crane, and reduce the construction cost. At the same time, the cable tower and anchor of the suspension bridge itself are fully utilized as the support and anchoring device of the cable crane, avoiding the setting of the cable crane anchor on the mountain, reducing the span of the cable crane and avoiding the damage of the temporary anchor to the mountain.

[0039] 2. The method of the present invention adopts a fully-rotating modular vehicle for one-way erection during the steel truss erection process, thereby avoiding the need to set up assembly sites on both sides of the canyon, reducing construction costs, and adopts a fully-rotating modular vehicle for the rotation of the tower root of the entire section of the steel truss, thereby improving the transportation efficiency in the canyon and mountainous areas, reducing the construction period, and avoiding the installation of rotating hoists for cable cranes, saving equipment costs, simplifying the cable crane structure and reducing the load.

[0040] 3. The method of the present invention calculates and analyzes the linear shape of the stiffening beam in the short rigid hanger area during the erection process according to the characteristics of large displacement and rotation angle of the stiffening beam in the short rigid hanger area, and places permanent supports before the erection of the steel truss beam, thereby avoiding the conflict between the displacement and rotation angle and the anchor during the hoisting of the initial steel truss segment, and also completes the placement of permanent supports in advance, avoiding subsequent support installation, and improving construction efficiency.

[0041] 4. The method of the present invention calculates and analyzes the construction process of the stiffening beam of a single-tower single-span ground-anchored rotary cable suspension bridge according to the linear changes of the main cables and stiffening beams during the one-way erection of the entire segment steel truss stiffening beams, sets the hinge interface according to the principle of small linear changes of the stiffening beam segments, selects a temporary hinged stiffening beam with a small opening of the lower chord, and completes the rigid connection without applying weight or force, which can reduce the force of rigid-hinge conversion, avoid the use of large equipment, reduce construction difficulty, and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0043] Figure 1 It is a schematic diagram of the construction process of the present invention;

[0044] Figure 2 It is a schematic diagram of the installation process of the cable crane of the present invention;

[0045] Figure 3 It is a schematic cross-sectional view of a finished product of a single-tower single-span ground-anchored revolving cable suspension bridge of the present invention;

[0046] Figure 4 It is a schematic diagram of the cross section of the large height difference cable of the present invention;

[0047] Figure 5 It is a schematic diagram of the transportation plane of the large-segment steel truss of the present invention;

[0048] Figure 6 It is a cross-sectional schematic diagram of the process of the one-way erection method of the steel truss beam of the present invention;

[0049] Figure 7 It is a cross-sectional schematic diagram of the short rigid hanger area stiffening beam erection technology of the present invention;

[0050] Figure 8 It is a schematic diagram of the active adjustment and closure of the steel truss beam of the present invention.

[0051] In the figure:

[0052] 1. Rotating anchor; 2. Gravity anchor on the side of the bridge tower; 3. Pile foundation of the bridge tower; 4. Main tower; 5. Main cable; 6. Suspension cable; 7. Temporary tower frame; 8. Lifting cable; 9. Steel truss; 10. Fully rotating module vehicle; 11. Three-dimensional jack; 12. Permanent support. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in 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.

[0054] In the embodiment, see Figures 1 to 8 .

[0055] like Figure 1 As shown, the present invention provides a construction method for a steel truss beam of a single-tower single-span ground-anchored revolving cable suspension bridge. The single-tower single-span ground-anchored revolving cable suspension bridge used here has a unique force. The specific finished product composition is referenced to Figure 3 The steps of the construction method specifically include:

[0056] Step 1. Install the main tower 4 and temporary tower 7 of the suspension bridge on both sides, and then install the slewing cable with cable crane. Further, the cable crane installation process is as follows: Figure 2 As shown;

[0057] Step 11. Install the rotary anchor 1 on one side, and install the bridge tower side gravity anchor 2 and the bridge tower pile foundation pedestal 3 on the other side;

[0058] Step 12. After the construction is completed, the temporary tower frame 7 is assembled and the main tower 4 is installed on the bridge tower pile foundation 3;

[0059] Step 13. After the main tower 4 is constructed, a temporary cable saddle and a temporary traction system are installed. The temporary traction system consists of the main cable wind cable traction cable and the lifting cable 8. The main cable is fine-tuned and tested. At this time, a large height difference cable hoist is formed. Figure 4 shown.

[0060] In the specific implementation, according to the structural form of a single-tower and single-span ground-anchored revolving cable suspension bridge, the cable crane is only provided with a low cable tower on the revolving cable side, and is arranged at the anchorage; no cable tower is arranged on the bridge tower side, and its saddle is placed on the top of the tower. The cable crane is arranged in a high-low tower form, and the main cable anchorages on both sides, the rear wind cable, the traction cable steering and the lifting cable 8 anchorages are all arranged on the anchorage.

[0061] Through the setting of the cable crane, the steel truss 9 can be hoisted in an entire section, and at the same time, the cable tower and anchor of the suspension bridge itself are fully utilized as the support and anchoring device of the cable crane. This technology avoids the installation of cable crane anchors on the mountain, reduces the span of the cable crane, and avoids the damage of the temporary anchor to the mountain. At the same time, the setting of the large height difference cable crane can meet the needs of hoisting the entire section of the steel truss 9, improves the efficiency of the erection of the steel truss 9 section, shortens the construction period, and at the same time reduces the height of the cable tower, saves the engineering workload of the cable crane, and reduces the construction cost.

[0062] Step 2. Install an auxiliary bracket at the bottom of the main tower 4 of the suspension bridge to install 9 segments of steel trusses at the base of the tower;

[0063] The installation process of the auxiliary support specifically includes: fixing the embedded parts on the steel bars of the bridge tower foundation, and casting them together with the bridge tower foundation by using the method of cast-in-place concrete independent foundation to obtain the auxiliary support foundation;

[0064] The auxiliary support is installed by a car crane, the auxiliary support columns are made of spiral welded pipes, the columns are connected by steel pipes, and the steel pipes are connected by welding.

[0065] Step 3. After the steel truss 9 is assembled, the steel truss 9 is transported section by section using the fully revolving module vehicle 10 and rotated into place, waiting for the entire section of the steel truss 9 to be lifted;

[0066] During the process of removing the steel truss 9 from the mold, transporting and rotating it into place, the following method is used: Figure 5 The structure of the fully revolving module vehicle 10 shown in the figure, at this time, the specific operation process of the steel truss 9 being transported and rotated into place includes:

[0067] Step 31. After the steel trusses 9 are assembled, the large-segment steel trusses 9 are removed by using the lifting function of the fully-rotating module vehicle 10, and when the steel trusses 9 are stored, the large-segment steel trusses 9 are dropped onto the beam storage rack by the fully-rotating module vehicle 10;

[0068] Step 32. Use the fully revolving module vehicle 10 to rotate the steel truss beam 9 on the beam storage frame by 90 degrees and then drive it along the transportation channel to the base of the bridge tower, and the steel truss beam 9 enters the rotation area;

[0069] Step 33. After the steel truss 9 is moved into position, the steel truss 9 is rotated into position along the rotation centerline, and the full-revolving module vehicle 10 moves toward the mid-span direction to the bottom of the cable crane, waiting to be lifted.

[0070] In the specific implementation, according to the structural characteristics of the single-tower and single-span ground-anchored revolving cable suspension bridge, three sections near the tower root are first erected as a revolving construction platform, and the 9 sections of steel trusses are transported from the approach bridge to the tower root by the fully revolving module vehicle 10, rotated 90° on the platform, and then lifted by a cable crane, and longitudinally moved from the side of the main tower 4 to the revolving cable anchor side under the installed hoist rod, and then pushed forward unidirectionally from the revolving cable anchor side to the side of the main tower 4 for erection.

[0071] This technology avoids the need to install a rotating hoist on the cable crane when lifting and moving the entire section of the suspension bridge stiffening beam in one direction, simplifies the cable crane structure and reduces the load; the rotation and longitudinal movement of the stiffening beam segment and the lifting and docking processes are carried out in parallel, saving construction time.

[0072] In addition, the one-way erection avoids the need to set up assembly sites on both sides of the canyon, reducing construction costs. The full-swing module vehicle 10 is used for the rotation of the entire section of the tower root of the steel truss 9, which improves the transportation efficiency in the canyon and mountainous areas, shortens the construction period, and avoids the installation of rotating hoists for cable cranes, saving equipment costs.

[0073] Step 4. The entire segment of the steel truss 9 is hoisted and installed to a preset position by a cable crane, and connected to the adjacent steel truss 9 by a temporary hinge device;

[0074] The specific erection process of the whole segment steel truss 9 is referenced Figure 6 ,include:

[0075] Step 41. Before erecting the steel truss 9, place a permanent support 12 on the slewing anchor 1;

[0076] Step 42. The cable hoisting starting segment is hoisted from the working platform at the root of the main tower 4. During the hoisting process, the steel beam is transported under the main cable 5. After being hoisted to the installation position, the end of the steel beam is dropped on the permanent support 12, and the other end is connected to the sling 6. After the connection is completed, the steel truss 9 and the anchor are temporarily longitudinally limited;

[0077] Step 43. The cable hoist hoists the next section of the standard steel beam on the working platform. After the hoisting is completed, it is transported to the installation position under the main cable 5 of the slewing cable. The sling 6 is connected to the steel beam. The erected steel beam section is hinged with the installed beam section through a temporary hinge device using a pin shaft;

[0078] Step 44. Construct the temporary connection pins at the steel beam joint. After completing the temporary connection of the steel beam, release the hook with the cable and proceed to hoist the next beam section.

[0079] In addition, it should be noted that the single-tower single-span ground-anchored revolving cable suspension bridge uses short rigid hangers on the 9-segment steel truss on the revolving cable anchorage side. Figure 7 According to the characteristics of large displacement and rotation angle of the stiffening beam in the short rigid hanger area, the linear shape of the stiffening beam in the short rigid hanger area during the erection process is calculated and analyzed. A permanent support 12 is placed before the steel truss 9 is erected. After the initial segment is hoisted, the end of the steel beam falls on the permanent support 12, and the upper and lower plates of the support are unlocked, so that the stiffening beam is in a free rotation state on the permanent support 12, and the other end is connected to the sling 6. After the connection is completed, the lower chord of the initial segment is temporarily longitudinally limited with the anchor. After the steel truss 9 is connected, the anchor bolts of the permanent support 12 on the slewing cable side are grouted and fixed.

[0080] This technology not only avoids the conflict between the displacement and rotation angle during the lifting of the initial steel truss 9 segment and the slewing anchor 1, but also completes the placement of the permanent support 12 in advance, avoiding subsequent support installation and improving construction efficiency.

[0081] Step 5. After the overall hoisting of the steel truss 9 is completed, the rigid hinge conversion is performed and the temporary hinge device is cut off;

[0082] When the steel truss 9 is hoisted, since the main cable 5 is constantly deformed during the hoisting process of the steel truss 9, a finite element simulation analysis is also performed on the hoisting process of the suspension bridge steel truss 9 during the rigid-hinged conversion process. During the hoisting process, the adjacent segments of the previously hoisted segments are rigidly connected in sequence according to the calculation results and on-site monitoring data to form a relatively stable unit.

[0083] In the specific implementation, according to the linear changes of the main cable 5 and the stiffening beam during the one-way erection of the entire segment steel truss stiffening beam, the construction process of the stiffening beam of the single-tower single-span ground-anchored rotary cable suspension bridge was calculated and analyzed, and the hinged interface was set according to the principle of small linear changes of the stiffening beam segment. The temporary hinged lower chord opening of the stiffening beam was selected to complete the rigid connection without applying weight or force, thereby simplifying the construction process and improving construction efficiency.

[0084] Step 6. Adjust the horizontal spacing, height difference, and relative rotation angle of the joint opening of the steel truss beam 9 at the base of the bridge tower, and weld the butt welds synchronously to complete the main span joint of the entire section of the steel truss beam 9;

[0085] Reference for the specific operation process of 9-segment main span closure of steel truss beams Figure 8 ,include:

[0086] Step 61. The steel truss 9 segments at the base of the bridge tower are installed in situ using auxiliary brackets at the bottom of the bridge tower, and a three-dimensional jack 11 is installed at the bottom of the steel truss 9 on the side of the main tower 4;

[0087] Step 62. The 9 segments of the steel truss at the base of the bridge tower are initially in a horizontal state, and then adjusted to a preset posture;

[0088] Step 63. After all the steel truss beam 9 segments are hoisted, installed and rigidly connected, the measured linear shapes of the steel beams at both ends of the joint are compared with the finite element analysis calculation values, and the three-dimensional jack 11 is used to longitudinally move and lift the root segments of the bridge tower in sequence to adjust the horizontal spacing, height difference and relative rotation angle of the joint to eliminate the relative height difference and rotation angle of the joint;

[0089] Step 64. After the high bolts are tightened, the butt welds are welded simultaneously to complete the main span closure.

[0090] At this time, the force of rigid-hinge conversion can be reduced, the use of large equipment can be avoided, the construction difficulty can be reduced, and the construction period can be shortened.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0092] In addition, it should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0093] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, in the embodiments of the present invention, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A construction method for a steel truss beam of a single-tower single-span ground-anchored revolving cable suspension bridge, characterized in that the steps include: S1. Install the main tower and temporary tower of the suspension bridge on both sides, and then install the slewing cable with cable hanger; S2. After the steel trusses are assembled, the steel trusses are transported section by section using a fully rotating modular vehicle and rotated into place; S3. The entire segment of steel trusses is hoisted and erected to the preset position by cable cranes and connected to adjacent steel trusses by temporary articulated devices; S4. After the overall hoisting of the steel truss is completed, the rigid-hinged conversion is carried out and the temporary hinge device is cut off; S5. Adjust the horizontal spacing, height difference and relative rotation angle of the steel truss joint at the base of the bridge tower, weld the butt welds simultaneously, and complete the main span closure of the entire steel truss segment.

2. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 1, characterized in that: The specific process of step S1 includes: S11. Install the rotary anchor on one side and the tower side gravity anchor and tower pile foundation cap on the other side; S12. Assemble the temporary tower and install the main tower on the bridge tower pile foundation; S13. After the main tower construction is completed, install the temporary saddle and temporary traction system, which consists of the main cable wind cable traction cable and lifting cable.

3. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 2, characterized in that: After the step S1 is executed, an auxiliary bracket needs to be installed at the bottom of the main tower of the suspension bridge, so as to install the steel truss beam segment at the root of the tower.

4. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge as claimed in claim 3, characterized in that: The installation process of the auxiliary support specifically includes: fixing the embedded parts on the steel bars of the bridge tower foundation, and casting them together with the bridge tower foundation by using the method of cast-in-place concrete independent foundation to obtain the auxiliary support foundation; The auxiliary support is installed using a truck crane, the auxiliary support columns are made of spiral welded pipes, and the columns are connected by steel pipe welding.

5. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 2, characterized in that: The specific operation process of removing the steel truss from the mold, transporting and rotating it into place in step S2 includes: S21. After the steel truss is assembled, the large-segment steel truss is removed by using the lifting function of the fully rotating module vehicle, and when the steel truss is stored, the large-segment steel truss is dropped onto the beam storage rack by the fully rotating module vehicle; S22. Use the fully revolving module vehicle to rotate the steel truss on the beam storage rack by 90 degrees and then drive it along the transport channel to the base of the bridge tower; S23. After the steel truss is moved into position, it is rotated into position along the rotation centerline, and the full-rotation module vehicle moves toward the mid-span direction to the bottom of the cable crane.

6. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 5, characterized in that: The specific erection process of the whole segment steel truss in step S3 includes: S31. Before erecting the steel truss, place permanent supports on the slewing anchors; S32. The cable crane hoisting start section is hoisted from the working platform at the root of the main tower. During the hoisting process, the steel beam is transported under the main cable. After being hoisted to the installation position, the end of the steel beam is dropped on the permanent support and the other end is connected to the hoisting cable. After the connection is completed, the steel truss beam and the anchor are temporarily longitudinally limited; S33. The cable crane hoists the next section of standard steel beam on the working platform. After the hoisting is completed, it is transported to the installation position under the main cable of the slewing cable. The sling is connected to the steel beam. The erected steel beam section is hinged with the installed beam section through a temporary hinge device using a pin shaft; S34. Construct the temporary connection pins at the joints of the steel beams. After completing the temporary connection of the steel beams, release the hook with the cable and proceed with the hoisting of the next beam section.

7. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 6, characterized in that: During the rigid-hinge conversion process in step S4, a finite element simulation analysis is also performed on the hoisting process of the steel truss of the suspension bridge, and during the hoisting process, adjacent segments of the previously hoisted segments are rigidly connected in sequence according to the calculation results and on-site monitoring data to form a relatively stable unit.

8. The construction method of the steel truss beam of the single-tower single-span ground-anchored revolving cable suspension bridge according to claim 7, characterized in that: The specific operation process of closing the main span of the entire steel truss segment in step S5 includes: S51. Install a three-dimensional jack at the bottom of the steel truss on the side of the main tower; S52. The steel truss girder segment at the base of the bridge tower is initially in a horizontal state and then adjusted to a preset posture; S53. After all steel truss girder segments are hoisted, installed and rigidly connected, the measured linear shapes of the steel beams at both ends of the joint are compared with the values ​​calculated by finite element analysis. The 3D jacks are used to longitudinally move and lift the segments at the base of the bridge towers in sequence, and the horizontal spacing, height difference and relative rotation angle of the joint are adjusted respectively to eliminate the relative height difference and rotation angle of the joint. S54.Simultaneously weld the butt welds to complete the main span closure.

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