A method for synchronously constructing a tower beam of a special-shaped steel tower cable-stayed bridge

Abstract

The present application belongs to the technical field of bridge design and construction, and particularly relates to a method for synchronously constructing a tower and a girder of a special-shaped steel tower cable-stayed bridge, comprising the following steps: synchronously erecting a cable-stayed bridge girder support, a steel tower support and a gantry crane foundation; laying a gantry crane track on the gantry crane foundation and installing a gantry crane; installing a rotating steel tower steel and concrete combined section and pouring concrete; installing a rotating steel tower T1 section and testing the rotating body; pouring a cable-stayed bridge girder and assembling remaining steel tower sections through the gantry crane; installing a lattice column and a lattice column jack and vertically rotating the steel tower; installing and tensioning a stay cable and removing an auxiliary structure; installing a bridge deck pavement and completing the construction of the special-shaped steel tower cable-stayed bridge. The present application has the beneficial effect of realizing synchronous construction of a bridge tower and a girder and solving the problem of a tight bridge construction period.

Description

Technical Field

[0001] This invention belongs to the field of bridge design and construction technology, and in particular relates to a method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers. Background Technology

[0002] In recent years, the design of irregular steel structure bridges and unconventional bridge construction technologies have been widely applied in urban bridge construction. Municipal bridges bear the mission of urban traffic operation, and whether bridges can be completed and opened to traffic on schedule is of great significance to municipal transportation. Therefore, rapid construction technologies for urban bridges have also been favored by many researchers.

[0003] Unlike highway bridges, urban bridge construction sites are often located in bustling urban areas with heavy traffic, surrounded by schools, residential areas, and commercial districts, thus facing numerous constraints such as site availability, traffic flow, construction period, and aesthetics. At the beginning of this century, my country's urban bridge construction entered a phase of rapid and high-quality development, giving rise to many new concepts, such as people-oriented design and prefabricated bridges; as well as technological innovations such as system innovation, structural innovation, and the application of new technologies and materials. The emergence of unconventional technologies, such as the box girder walking-launching method, the box girder dragging and sliding method, the main tower horizontal rotation method, and the main tower vertical rotation method, has greatly improved the construction efficiency of irregularly shaped steel structure bridges within limited urban spaces. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, this invention provides a method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers. This method innovatively solves the problem of tight construction schedules for bridges by constructing the bridge tower and beam simultaneously. At the same time, the steel tower is assembled segment by segment on a formwork using a gantry crane, which reduces the amount of high-altitude welding work and greatly improves safety performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for simultaneous construction of the tower and beam of an irregularly shaped steel tower cable-stayed bridge, characterized by the following steps:

[0007] Step 1: Construct a steel trestle bridge on one side of the main bridge and build the main bridge pile foundation and abutment;

[0008] Step 2: Construct the main pier base, lower tower column, and main beam section of the tower-beam connection segment;

[0009] Step 3: Simultaneously erect the main beam support, steel tower support, and gantry crane foundation for the cable-stayed bridge;

[0010] Step 4: Install the formwork and reinforcing steel of the main beam of the cable-stayed bridge, and at the same time lay the gantry crane track on the gantry crane foundation and install the gantry crane;

[0011] Step five, install the steel tower steel-concrete joint section, pour the concrete of the steel-concrete joint section, and tension the prestress;

[0012] Step six, install the vertical rotation starting section T1 section of the steel tower, and test the rotation of the T1 section;

[0013] Step seven, pour the main girder of the cable-stayed bridge, and assemble the remaining steel tower sections through the gantry crane section by section;

[0014] Step eight, install the lattice column in the main girder part of the tower beam fixed section, and tension the four corner wind ropes of the lattice column;

[0015] Step nine, install the lattice column jack, combine the steel tower vertically, seal the joint interface and the rotation hinge, and tension the stay cable;

[0016] Step ten, install and tension the stay cable, and remove the auxiliary structure lattice column and the jack;

[0017] Step eleven, install the bridge deck pavement, and complete the construction of the special-shaped steel tower cable-stayed bridge.

[0018] Preferably, in the step one, the principle of dividing the steel tower section is that the weight of the section is not more than 40t; the size of the steel tower section meets the transportation requirements of the highway and municipal road; the steel tower section is manufactured in a steel structure professional processing plant, and the steel tower vertical rotation hinge is manufactured together with the corresponding steel tower section.

[0019] Preferably, in the step three, the main girder support is erected at the position directly below the designed position of the main girder; the steel tower support is located in the horizontal projection area of the upstream and downstream steel tower legs along the transverse bridge direction; the gantry crane foundation crosses the steel tower support and is arranged on both sides of the steel tower support; the axis of the steel tower support and the gantry crane foundation is perpendicular to the longitudinal bridge direction of the main bridge; after the main girder support and the steel tower support are erected, pre-pressing is performed; in the step four, the gantry crane track crosses the main girder of the cable-stayed bridge and the steel trestle, and extends to the horizontal projection area of the steel tower leg along the transverse bridge direction; in the step seven, the remaining steel tower sections are transported to the lifting range of the gantry crane through the steel trestle, and are assembled and welded section by section on the bed frame on the steel tower support through the lifting of the gantry crane.

[0020] Further preferably, the steel tower support and the gantry crane foundation are connected with each other in a flat connection manner to increase the transverse bridge direction stiffness of the steel tower support.

[0021] Preferably, in the step four, the cushion beam is arranged on the top of the gantry crane foundation and the top surface of the main girder of the tower beam fixed section, the top surface elevation of the cushion beam is set as the same elevation, and the gantry crane track is laid on the top of the cushion beam.

[0022] Preferably, in the step six, the process of installing the segment of the rotating steel tower T1 is as follows: the gantry crane lifts the segment of the rotating steel tower T1 to above the bed of the segment T1, slowly lowers the column foot end of the segment T1, places the segment T1 into the back side rotating hinge of the steel-concrete combined segment, and makes the centers of the rotating hinges coincide, and inserts the pin shaft; the gantry crane slowly lowers the column top end of the segment T1 to the bed.

[0023] Preferably, in the step six, the process of testing the rotating segment T1 is as follows: the gantry crane lifts the column top end of the segment T1, slowly moves the gantry crane to the direction of the main beam of the cable-stayed bridge while lifting upward, gradually makes the segment T1 rotate from the "flat lying" state on the bed to the "upright" state, checks the rotating condition of the segment T1, and checks the port connection deviation between the segment T1 and the steel-concrete combined segment after the segment T1 is in place; after the testing of the rotation is completed, the segment T1 is rotated to the "flat lying" state on the bed again.

[0024] Preferably, in the step eight, the segment of the latticed column is connected with the embedded part of the tower beam consolidation segment, the segments of the latticed column are connected by bolts; the longitudinal width of the latticed column is greater than the longitudinal width of the steel tower, the top region of the latticed column is provided with a non-plain connection region, the two tower limbs pass through the non-plain connection region and are closed inside the latticed column; the wind rope of the latticed column connects the latticed column and the embedded part of the solid segment of the end beam of the cable-stayed bridge into one body, and a certain pre-tightening force is applied.

[0025] Preferably, in the step nine, the process of installing the jacks of the latticed column is as follows: a plurality of groups of temporarily rotatable anchoring points are arranged from the top to the bottom of the centripetal side of the rotating steel tower, a plurality of groups of bidirectional pulling devices and jacks are arranged from top to bottom in the latticed column, and the jacks in the latticed column are connected with the temporarily rotatable anchoring points of the steel tower through the steel strands.

[0026] Preferably, in the step nine, the process of vertical rotation and closure of the rotating steel tower is as follows: the jacks in the latticed column are synchronously tensioned, and the vertical rotation angle of the steel tower and the tension of the jacks are synchronously monitored; as the vertical rotation angle of the steel tower gradually increases, when the uppermost temporarily rotatable anchoring point of the steel tower approaches the latticed column, the oil cylinder pressure of the top layer of jacks is kept unchanged, the tension of the middle and lower layers of jacks is synchronously increased, until the tension of the top layer of jacks is 0, and the top layer of jacks is out of work; the middle and lower layers of jacks continue to work, and the steel tower continues to vertically rotate; the middle and lower layers of jacks on the latticed column are phased out of work from top to bottom, until the steel tower is closed, at this time, the two tower limbs vertically rotate through the non-plain connection region at the top of the latticed column, and the top of the two tower limbs extends into the inside of the latticed column; at least one group of jacks should be in working state when the steel tower is closed.

[0027] Preferably, in the step nine, the sealing welding process at the closure joint and the rotating hinge is: welding the temporary horse plate at the closure joint, temporarily connecting the two tower limbs by using multiple groups of temporary horse plates inside the lattice column; after the overall measurement of the spatial posture of the steel tower is correct, sealing welding the contact surface at the rotating hinge between the steel-concrete combined section and the T1 section; sealing welding the closure contact surface of the two tower limbs inside the lattice column, removing the temporary horse plate, and completing the steel tower construction.

[0028] The beneficial effects of the present application are:

[0029] (1) The special-shaped steel tower cable-stayed bridge tower beam synchronous construction method provided by the present application can realize the synchronous construction of the bridge tower beam by synchronously erecting the steel tower support in the direction perpendicular to the main beam support of the cable-stayed bridge and the gantry crane foundation, and innovatively solves the problem of tight bridge construction period.

[0030] (2) In the present application, the gantry crane track crosses the main beam of the cable-stayed bridge and the steel trestle, and extends to the horizontal projection area of the tower limb of the rotating steel tower along the transverse bridge, realizing the transportation of the steel tower section from one side of the bridge trestle and the transverse transfer by the gantry crane, and solving the problem of water and land transportation of the wide urban steel structure cable tower.

[0031] (3) In the present application, the steel tower support is erected on the upstream and downstream outer sides of the main bridge, and after the vertical rotation of the steel tower is completed, the steel pipe pile can be easily pulled out in the later period, which is very friendly to the urban river environment management.

[0032] (4) In the present application, the steel tower is assembled in a "flat lying" mode on the jig, and only the closure joint at the top of the tower is used for aerial operation, which greatly reduces the amount of high-altitude welding operation and greatly improves the safety performance.

[0033] (5) In the present application, the lattice column is a fabricated structure, which is installed in a standard section assembly mode, has high construction efficiency, and provides an operating space for the opposite pulling of the double towers and a welding platform for the closure section at the top of the tower, etc., which is convenient for realizing multifunctional integration. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram of the synchronous erection of the main beam support, the steel tower support and the gantry crane foundation in step three of the present application;

[0035] Figure 2 It is a schematic diagram of the lifting of the steel tower section by the gantry crane in step seven of the present application;

[0036] Figure 3 It is a schematic diagram of the steel tower section after assembly in step seven of the present application;

[0037] Figure 4 It is a schematic diagram of the installation of the lattice column jack in step nine of the present application;

[0038] Figure 5 、 Figure 6It is the schematic view of the vertical turning and the sealing of the hinge of the steel tower of the step nine of the present application;

[0039] Figure 7 It is the sectional view of the steel tower of the present application; Figure 6

[0040] Figure 8 It is the vertical turning and the sealing of the hinge of the steel tower of the present application.

[0041] In the figure: 1, steel trestle, 2, steel tower segment, 2-1, steel and concrete combined segment, 2-2, T1 segment, 2-3, remaining steel tower segment, 3-1, T1 segment turning hinge to back side, 3-2, steel and concrete combined segment turning hinge to back side, 4, pile cap, 5, lower tower column, 6, cable-stayed bridge girder, 7, tower girder consolidation segment, 8, girder support, 9, wind rope, 10, gantry crane foundation, 11, flat link, 12, cushion beam, 13, gantry crane track, 14, gantry crane, 15, lattice column, 16, tower girder consolidation segment bridge surface embedded part, 17, no flat link area, 18, temporary rotatable anchoring point, 19, jack, 20, cradle, 21, steel tower support, 22, steel strand, 23, stay cable, 24, cable-stayed bridge end beam solid segment embedded part. DETAILED DESCRIPTION

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with the help of the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] As shown in the figure, the present application is a special-shaped steel tower cable-stayed bridge tower girder synchronous construction method, which comprises the following steps: Figures 1 to 8

[0045] Step one, erecting the over-river steel trestle 1, constructing the main bridge pile foundation and pile cap 4

[0046] Erecting the over-river steel trestle 1 on one side of the main bridge, constructing the main bridge pile foundation and the pile cap 4 above the pile foundation; manufacturing the steel tower segments 2 according to the number of segments of the steel tower, manufacturing the vertical turning hinge together with the corresponding steel tower segment 2;​​

[0047] The principle of segment division of the steel tower segment 2 is that the weight of the segment is not more than 40 t, and the size of the segment meets the transportation requirements of the highway and municipal road; the steel tower segment 2 is manufactured in a steel structure professional processing plant, and the adjacent steel tower segments 2 are matched in the field after being manufactured in the plant.

[0048] Step two, construction of the main pier tower base, the lower tower column 5 and the tower beam consolidation section 7 main beam part above the lower tower column 5;

[0049] Step three, synchronous erection of the cable-stayed bridge main beam support 8, the steel tower support 21 and the gantry crane foundation 10

[0050] The cable-stayed bridge main beam support 8 is erected directly below the designed position of the cable-stayed bridge main beam 6; at the same time, the steel tower support 21 and the bed frame 20 located on the steel tower support 21 are erected in the horizontal projection area of the "flat lying" state of the main bridge tower limb; at the same time, the gantry crane foundation 10 located on both sides of the steel tower support 21 is erected; the steel tower support 21 is used to place the steel tower segment 2, which gradually increases in height in the direction away from the main bridge in the transverse direction of the main bridge, so as to match the tower limb, and the gantry crane foundation 10 is used to erect the gantry crane track 13. After the completion of the erection of the main beam support 8 and the steel tower support 21, pre-pressing is performed. The axes of the steel tower support 21 and the gantry crane foundation 10 are perpendicular to the longitudinal direction of the main bridge; the steel tower support 21 and the gantry crane foundation 10 are connected with each other by the flat link 11 to increase the rigidity of the steel tower support 21 in the transverse direction of the main bridge;

[0051] Step four, installation of the cable-stayed bridge main beam 6 formwork, reinforcement, laying of the gantry crane track 13 and installation of the gantry crane 14

[0052] The cable-stayed bridge main beam 6 formwork, reinforcement and other structures are installed, at the same time, the cushion beam 12 is arranged on the top of the gantry crane foundation 10 and the top surface of the main beam of the tower beam consolidation section 7, the top part of the I-beam distribution beam of the steel trestle 1 is used as the cushion beam 12 of the gantry crane track 13 beam, the top surfaces of the cushion beams 12 are at the same elevation, the gantry crane track 13 is laid above the cushion beams 12; the gantry crane 14 is assembled on the steel trestle 1 by using the truck crane.

[0053] Step five, installation of the steel-concrete combined segment 2-1 of the rotating steel tower, pouring of the concrete of the steel-concrete combined segment 2-1 and tensioning of the prestress.

[0054] Step six, installation of the T1 segment 2-2 of the rotating steel tower vertical rotation starting segment and trial rotation of the T1 segment 2-2

[0055] The gantry crane 14 lifts the steel tower segment 2-2 to above the jig 20, slowly lowers the column foot end of the steel tower segment 2-2, places the steel tower segment into the back side hinge 3-2 of the steel-concrete joint segment, and makes the centers of the hinges coincide, and manually inserts the pin shaft; the gantry crane 14 slowly lowers the column top end of the steel tower segment 2-2 to the jig 20, and completes the installation of the steel tower segment 2-2; the gantry crane 14 lifts the column top end of the steel tower segment 2-2, slowly moves towards the main girder 6 of the cable-stayed bridge while lifting upward, gradually makes the steel tower segment 2-2 turn from the "lying" state to the "standing" state, checks the turning state of the steel tower segment 2-2, checks the port alignment deviation between the steel tower segment 2-2 and the steel-concrete joint segment 2-1 after the steel tower segment 2-2 is in place, and turns the steel tower segment 2-2 to the "lying" state on the jig 20 again after the trial turning is completed.

[0056] Step seven, pouring of the main girder 6 of the cable-stayed bridge and assembly of the remaining steel tower segments 2-3

[0057] The main girder 6 of the cable-stayed bridge is poured; the divided steel tower segments 2 are gradually transported from the steel trestle 1 to the lifting range of the gantry crane 14, the gantry crane 14 lifts the steel tower segments 2 and moves them to the design position of the jig 20 in the transverse direction of the bridge, lowers the steel tower segments 2 to align them with the ports of the previous segments, and welds them.

[0058] Step eight, installation of the lattice column 15 and tensioning of the wind-warding ropes 9

[0059] The lattice column 15 is installed on the main girder part of the tower beam fixed segment 7, and the wind-warding ropes 9 are tensioned at the four corners of the lattice column 15. Specifically, the bottom segment of the lattice column 15 is connected with the bridge surface embedded part 16 of the tower beam fixed segment, and the segments of the lattice column 15 are connected by bolts. The longitudinal width of the lattice column 15 is greater than the longitudinal width of the steel tower, and a non-flat connection area 17 is provided at the top region of the lattice column 15, through which the two tower limbs of the steel tower are turned and joined inside the lattice column 15. The wind-warding ropes 9 are installed at the four corners of the lattice column 15, the lattice column 15 and the end cross beam solid segment embedded part 24 of the cable-stayed bridge are connected as a whole through the wind-warding ropes 9 of the lattice column 15, and a certain pre-tightening force is tensioned.

[0060] Step nine, vertical turning and joining of the steel tower

[0061] (1) Installation of the lattice column 15 jack 19: multiple groups of bidirectional pulling devices and jacks 19 are provided in the lattice column 15 from top to bottom; multiple groups of temporary rotatable anchoring points 18 are provided in the centripetal side of the steel tower from the top to the bottom of the tower; steel strands 22 are used to connect the jacks 19 inside the lattice column 15 with the temporary anchoring points 18 of the steel tower.

[0062] (2) Steel tower vertical rotation, closure: synchronous tensioning of the jacks 19 in the lattice column 15, ensuring the synchronization of the two tower limbs vertical rotation, and monitoring the steel tower vertical rotation angle and the tension of the jacks 19; as the steel tower vertical rotation angle gradually increases, the uppermost temporary rotatable anchor point of the steel tower approaches the lattice column 15, the top layer jack 19 oil cylinder pressure is kept unchanged, the tension of the middle and lower layer jacks 19 is increased synchronously, until the top layer jack 19 tension is 0, the top layer jack 19 exits work; the middle and lower layer jacks 19 continue to work, the steel tower continues to rotate vertically; the middle and lower layer jacks 19 on the lattice column 15 exit work from top to bottom in stages, until the steel tower closure, when the steel tower closure should ensure that at least one group of jacks 19 is in working condition; until the two tower limbs vertical rotation through the lattice column 15 non-parallel area 17, the top of the two steel tower limbs extends into the interior of the lattice column 15, completing the tower limb vertical rotation.

[0063] (3) Steel tower closure, welding at the hinge: inside the lattice column 15, a plurality of groups of plates are used to temporarily connect the two tower limbs; after the overall measurement of the spatial posture of the steel tower is correct, the contact surface at the hinge between the steel-concrete combined section 2-1 and the T1 section 2-2 is welded; the two tower limbs are welded at the closure contact surface in the lattice column 15, and the temporary plate is removed; the steel tower construction is completed.

[0064] Step ten, install and tension the stay cable 23, remove the auxiliary structure lattice column and the jack;

[0065] Step eleven, install the bridge deck pavement, and complete the construction of the special-shaped steel tower cable-stayed bridge.

[0066] The above detailed description of the examples of the present application, but the content is only the preferred embodiments of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made in accordance with the scope of the present application should still belong to the scope of the present application.

Claims

1. A method for simultaneous construction of the tower and beam of an irregularly shaped steel tower cable-stayed bridge, characterized in that... Includes the following steps: Step 1: Construct a steel trestle bridge on one side of the main bridge and build the main bridge pile foundation and abutment; Step 2: Construct the main pier base, lower tower column, and main beam section of the tower-beam connection segment; Step 3: Simultaneously erect the main beam support, steel tower support, and gantry crane foundation for the cable-stayed bridge; Step 4: Install the formwork and reinforcing steel of the main beam of the cable-stayed bridge, and at the same time lay the gantry crane track and install the gantry crane; Step 5: Install the steel-concrete composite section of the rotating steel tower, pour the concrete for the steel-concrete composite section, and tension the prestressing. Step 6: Install the T1 segment, the starting section for the vertical rotation of the rotating steel tower, and perform a trial rotation of the T1 segment; Step 7: Cast the main beam of the cable-stayed bridge and assemble the remaining steel tower segments one by one using a gantry crane; Step 8: Install lattice columns on the main beam of the tower-beam consolidation section and tension the guy ropes at the four corners of the lattice columns; Step 9: Install the lattice column jacks, vertically rotate and close the steel tower, and seal and weld the closure joints and hinges; Step 10: Install and tension the stay cables, and remove the auxiliary structural lattice columns and jacks; Step 11: Install the bridge deck paving to complete the construction of the irregular steel tower cable-stayed bridge.

2. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 1, characterized in that: In step three, the steel tower supports are located in the horizontal projection area of ​​the upstream and downstream steel tower rotating tower legs along the transverse bridge direction; the gantry crane foundation spans the steel tower supports and is set on both sides of the steel tower supports; the axes of the steel tower supports and the gantry crane foundation are perpendicular to the longitudinal direction of the main bridge. In step four, the gantry crane track spans the main beam of the cable-stayed bridge and the steel trestle bridge, and extends to the horizontal projection area of ​​the steel tower rotating tower leg along the transverse direction of the bridge. In step seven, the remaining steel tower segments are transported by steel trestle to the lifting range of the gantry crane, and then laterally transferred by the gantry crane to the jig on the steel tower support for segmental assembly and welding.

3. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: In step one, the principle for dividing the steel tower segments is that the segment weight does not exceed 40t; the dimensions of the steel tower segments meet the requirements for highway and municipal road transportation. The steel tower segments are manufactured in a specialized steel structure processing plant, and the vertical rotation hinge of the steel tower is manufactured together with the corresponding steel tower segments. In step four, pad beams are set on the top of the gantry crane foundation and the top surface of the main beam of the tower-beam consolidation section. The I-beam distribution beams on the top of the steel trestle bridge Bailey beam are used as pad beams for the gantry crane track. The top surface elevation of the pad beams is set to the same level. The gantry crane track is then laid on top of the pad beams.

4. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: In step six, the process of installing the rotating steel tower T1 segment is as follows: the gantry crane lifts the rotating steel tower T1 segment to the top of the T1 segment jig, and slowly lowers the column foot end of the T1 segment so that the T1 segment's back-side hinge is placed into the back-side hinge of the steel-concrete composite section, and the centers of the two hinges are aligned, and the pin is inserted; the gantry crane slowly lowers the top of the T1 segment column onto the jig.

5. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: In step six, the process of test rotation of segment T1 is as follows: the gantry crane lifts the top of segment T1 column, and while lifting upwards, the gantry crane slowly moves towards the main beam of the cable-stayed bridge, gradually turning segment T1 from the "flat" state of the formwork to the "upright" state. The rotation of segment T1 is checked. After segment T1 is rotated into place, the port connection deviation between segment T1 and the steel-concrete composite section is checked. After the test rotation is completed, segment T1 is rotated back to the "flat" state of the formwork.

6. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: In step eight, the bottom segment of the lattice column is connected to the embedded part of the bridge deck of the tower-beam consolidation section, and the segments of the lattice column are connected by bolts; the longitudinal width of the lattice column in the bridge direction is greater than the longitudinal width of the steel tower in the bridge direction, and there is a non-horizontal bracing area in the top area of ​​the lattice column. The two tower legs rotate vertically through the non-horizontal bracing area and close in the lattice column; the lattice column guy rope connects the lattice column to the embedded part of the solid section of the crossbeam at the end of the cable-stayed bridge into one piece, and is tensioned with a certain preload.

7. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: In step nine, the installation process of the lattice column jacks is as follows: multiple sets of temporary rotatable anchor points are set on the centripetal side of the rotating steel tower from the top to the bottom of the tower, and multiple sets of bidirectional pull-out devices and jacks are set on the lattice column from top to bottom. The jacks inside the lattice column are connected to the temporary rotatable anchor points of the steel tower through steel strands.

8. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 7, characterized in that: In step nine, the process of vertically rotating and closing the steel tower is as follows: Simultaneously tension each jack in the lattice column, and simultaneously monitor the vertical rotation angle of the steel tower and the tension force of the jacks; as the vertical rotation angle of the steel tower gradually increases, when the temporary rotatable anchor point at the top of the steel tower approaches the lattice column, keep the pressure of the top-level jack cylinders constant, and simultaneously increase the tension of the middle and lower-level jacks until the tension force of the top-level jack is 0, at which point the top-level jacks cease operation; the middle and lower-level jacks continue to operate, and the steel tower continues to rotate vertically; the middle and lower-level jacks on the lattice column gradually cease operation from top to bottom until the steel tower is closed. At this point, the two tower legs vertically rotate through the non-horizontal bracing area at the top of the lattice column, and the tops of the two tower legs extend into the interior of the lattice column; during the closure of the steel tower, at least one set of jacks should be in working condition.

9. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 8, characterized in that: In step nine, the sealing and welding process at the closure interface and hinge is as follows: a temporary support plate is welded at the closure interface, and multiple sets of support plates are used inside the lattice column to temporarily connect the two steel tower legs; after the overall spatial attitude of the steel tower is measured and confirmed to be correct, the contact surface at the hinge between the steel-concrete composite section and the T1 section is sealed and welded; the closure contact surface of the two tower legs is sealed and welded inside the lattice column, the temporary support plate is removed, and the steel tower construction is completed.

10. The method for simultaneous construction of the tower and beam of a cable-stayed bridge with irregular steel towers according to claim 2, characterized in that: The steel tower support and the gantry crane foundation are connected to each other using a horizontal connection.

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