Lifting device for steel tower cross beam of large-span cable-stayed steel truss girder bridge

Abstract

The utility model relates to a large-span cable-stayed steel truss girder bridge steel tower cross beam lifting device, and belongs to the technical field of bridge construction, the large-span cable-stayed steel truss girder bridge steel tower cross beam lifting device comprises a steel truss, the steel truss extends in the transverse bridge direction and is erected on the tops of two main towers, and the steel truss comprises two transverse truss pieces arranged side by side and a connecting system for connecting the two transverse truss pieces; and the lifting mechanism comprises first lifting assemblies arranged at the two ends of the transverse truss pieces correspondingly and second lifting assemblies arranged in a plane defined by the first lifting assemblies jointly, and the first lifting assemblies and the second lifting assemblies are used for lifting the main cross beam between the two main towers in a matched mode. By means of the method, accurate installation of the main cross beam can be achieved, the instability risk caused by using large hoisting equipment and an ultrahigh support is avoided, the risk of lifting the main cross beam is reduced, the site construction efficiency is improved, and the key time of the bridge construction period is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a large-span cable-stayed steel truss bridge steel tower beam lifting device. BACKGROUND

[0002] The large-span cable-stayed steel truss bridge is a kind of bridge, after the construction of the steel tower of the large-span cable-stayed steel truss bridge, the installation of the cross beam needs to be completed. The cross beam is located at the top of the steel tower, the construction height is large, and the assembly erection process is difficult.

[0003] At present, the tower crane is commonly used for hoisting the steel tower segment and the steel cross beam segment of the tower column, and the installation of the tower crane needs a large-tonnage tower crane due to the large weight of the steel tower segment and the steel cross beam segment, which is high in cost, and the wall attachment of the tower crane during construction has a large horizontal thrust on the tower column, which is easy to exceed the stress limit of the cable-stayed tower structure and is very unfavorable to the stress of the bridge.

[0004] Therefore, it is necessary to provide a large-span cable-stayed steel truss bridge steel tower beam lifting device to solve the problem of steel tower beam erection, save cost, speed up construction progress, improve structural safety and stability, and ensure high-quality requirements of bridge construction. SUMMARY

[0005] In view of the above background technology, the embodiments of the present application provide a large-span cable-stayed steel truss bridge steel tower beam lifting device, which can conveniently and quickly lift the steel tower beam as a whole, ensure the lifting stability, speed up the construction progress of the steel tower beam, and reduce the workload of high-altitude operation.

[0006] The embodiments of the present application provide a large-span cable-stayed steel truss bridge steel tower beam lifting device, which comprises:

[0007] The steel truss extends in the transverse direction of the bridge and is erected at the top of two main towers, and comprises two transverse truss pieces arranged side by side and a connecting system connecting the two transverse truss pieces.

[0008] The lifting mechanism comprises first lifting assemblies arranged at both ends of each transverse truss piece and a second lifting assembly arranged in a plane formed by the first lifting assemblies, and the first lifting assemblies and the second lifting assembly are used to cooperate to lift the main cross beam between the two main towers.

[0009] In some embodiments, the first lifting assembly comprises a first lifter arranged on the transverse truss piece and a steel strand connected to the first lifter and used to connect the main cross beam.

[0010] In some embodiments, the transverse truss piece has a hollow rectangular frame in cross section, the transverse truss piece is provided with a mounting seat for mounting the first lifter, and the steel strand penetrates through the transverse truss piece.

[0011] In some embodiments, an insulating layer is arranged on the outer surface of the steel strand to prevent overcurrent of the steel strand.

[0012] In some embodiments, the second lifting assembly comprises a distribution beam arranged on the top of the two transverse truss pieces, and a second lifter mounted on the distribution beam and used for connecting the main cross beam.

[0013] In some embodiments, a control unit is further included for controlling the first lifting assembly and the second lifting assembly to synchronously or asynchronously lift the main cross beam.

[0014] In some embodiments, a fall arrest line is arranged on the steel truss for connecting the main cross beam, and a lifting lug is arranged on the main cross beam for connecting the fall arrest line.

[0015] In some embodiments, a support assembly is further included, which is arranged on the top of the main tower and used for mounting the steel truss, and the support assembly comprises a first pad beam connected to the bottom end of the transverse truss piece, and a second pad beam supporting two ends of the first pad beam.

[0016] In some embodiments, the number of the connection systems is multiple, and each connection system comprises upper and lower chord members parallel to each other, and diagonal struts connecting the upper and lower chord members.

[0017] In some embodiments, a plurality of cradles are further included, which are arranged on the main beam of the bridge and used for supporting the main cross beam.

[0018] The technical scheme provided by the present application has the following beneficial effects:

[0019] The steel tower cross beam lifting device for long-span cable-stayed steel truss bridge provided by the embodiments of the present application can lift the main cross beam by using the main tower as the bearing, and during the lifting process, the four sets of first lifting assemblies synchronously lift the main cross beam, and the second lifting assembly is used for assisting the lifting at the transverse mid-span position, so that the posture of the main cross beam during the lifting process is stable, and after the main cross beam is lifted into place, the main cross beam is integrally welded, which can accelerate the construction progress and save the cost.

[0020] Therefore, the main tower can be used as the bearing to lift the main cross beam, during the lifting process, the four sets of first lifting assemblies synchronously lift the main cross beam, and the second lifting assembly is used for assisting the lifting at the transverse mid-span position, so that the posture of the main cross beam during the lifting process is stable, and after the main cross beam is lifted into place, the main cross beam is integrally welded, which can accelerate the construction progress and save the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0022] Figure 1 This is a schematic structural diagram of an embodiment of the present application;

[0023] Figure 2 A side cross-sectional view of a distribution beam according to an embodiment of the present application;

[0024] Figure 3 A side cross-sectional view of a connection system according to an embodiment of the present application;

[0025] Figure 4 A schematic side view of a support assembly according to an embodiment of the present application;

[0026] Figure 5 This is a schematic structural diagram of the tire frame according to an embodiment of the present application.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 1. Bridge main beam; 2. Main tower; 3. Support assembly; 31. First pad beam; 32. Second pad beam; 4. Steel truss; 41. Transverse truss; 42. Connection system; 5. First lifting assembly; 51. First lifter; 52. Mounting seat; 53. Steel strand; 6. Second lifting assembly; 61. Distribution beam; 62. Second lifter; 7. Main crossbeam; 8. Cradle. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] In response to the shortcomings or one of the shortcomings raised in the above-mentioned background technology, the embodiment of the present application provides a steel tower beam lifting device for a large-span cable-stayed steel truss bridge, which can conveniently and quickly lift the steel tower beam as a whole, ensure the lifting stability, speed up the construction progress of the steel tower beam, and reduce the workload of high-altitude operations.

[0031] See also Figures 1 to 5As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, comprising:

[0032] The steel truss 4 extends along the transverse direction of the bridge and is erected on the top of the two main towers 2, and the steel truss 4 comprises two transverse truss pieces 41 arranged side by side, and a connecting system 42 connecting the two transverse truss pieces 41;

[0033] The lifting mechanism comprises first lifting assemblies 5 arranged at both ends of each transverse truss piece 41 respectively, and a second lifting assembly 6 arranged in the plane jointly formed by each first lifting assembly 5, and the first lifting assembly 5 and the second lifting assembly 6 are used to cooperate to lift the main beam 7 between the two main towers 2.

[0034] The steel truss 4 of the large-span cable-stayed steel truss bridge steel tower beam lifting device of the embodiment of the present application is arranged along the transverse direction of the bridge and erected on the two main towers 2 of the bridge girder 1, the lifting mechanism for lifting the main beam 7 is arranged on the steel truss 4, the main towers 2 can be used as the bearing to lift the main beam 7, the overall main beam 7 can be conveniently and quickly lifted, the construction progress can be accelerated, the structural safety and stability can be improved, and the high-quality requirements of the bridge construction can be ensured.

[0035] Further, the two ends of each transverse truss piece 41 of the steel truss 4 of the embodiment are each provided with a first lifting assembly 5, and the second lifting assembly 6 is arranged between the first lifting assemblies 5 on the two sides of the transverse direction between the two transverse truss pieces 41. That is, there are four sets of first lifting assemblies 5 and one set of second lifting assemblies 6, and the four sets of first lifting assemblies 5 and the set of second lifting assemblies 6 cooperate to lift the main beam 7, which can improve the stability of the main beam 7 during lifting, thereby accelerating the construction progress and reducing the workload of high-altitude operation.

[0036] Illustratively, the two ends of the main beam 7 of the embodiment are low in the middle and high at the ends, during lifting, the four sets of first lifting assemblies 5 are arranged at the two ends to form a four-corner suspension, and the second lifting assembly 6 is arranged in the middle of the main beam 7, during the lifting process, the four sets of first lifting assemblies 5 are lifted synchronously, and the second lifting assembly 6 is used to assist the lifting at the transverse midspan position, which can ensure the posture stability of the main beam 7 during lifting and prevent overturning, and the main beam 7 is welded after being lifted in place, thereby accelerating the construction progress.

[0037] It should be noted that the main beam 7 of the large-span cable-stayed steel truss bridge of the embodiment has an installation height of more than thirty meters, and the block assembly of the main beam 7 and the installation operation of the steel truss 4 can be simultaneously realized, and the steel truss 4 and the lifting mechanism are cyclically used, which can reduce the construction cost. Thus, the risk of site limitation of using large lifting equipment and setting too high assembly support can be avoided, and the assembly period of the main beam 7 will not be affected.

[0038] In some optional embodiments: see Figures 1 to 5As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the first lifting assembly 5 of the large-span cable-stayed steel truss bridge steel tower beam lifting device comprises a first lifting device 51 arranged on the transverse truss piece 41, and a steel strand 53 connected to the first lifting device 51 and used for connecting the main beam 7.

[0039] The first lifting assembly 5 of the embodiment of the present application comprises the first lifting device 51 installed on the transverse truss piece 41, and the first lifting device 51 connects the main beam 7 through the steel strand 53. Exemplarily, the first lifting device 51 of the embodiment adopts a continuous jack, and the continuous jack cooperates with the multiple groups of steel strands 53, so that the main beam 7 can be effectively borne and lifted.

[0040] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the transverse truss piece 41 of the large-span cable-stayed steel truss bridge steel tower beam lifting device is a hollow rectangular frame, and the transverse truss piece 41 is provided with a mounting seat 52 for mounting the first lifting device 51, and the steel strand 53 penetrates the transverse truss piece 41.

[0041] The transverse truss piece 41 of the embodiment of the present application is a hollow rectangular frame, the mounting seat 52 is fixed on the transverse truss piece 41, the first lifting device 51 is fixed on the mounting seat 52, and the steel strand 53 is arranged up and down through the transverse truss piece 41, so that the structure has the advantages of strong stress stability. Exemplarily, the transverse truss piece 41 in the embodiment adopts a Bailey piece.

[0042] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the outer surface of the steel strand 53 of the large-span cable-stayed steel truss bridge steel tower beam lifting device is provided with an insulation layer for preventing the steel strand 53 from overvoltage.

[0043] The outer surface of the steel strand 53 of the embodiment of the present application is provided with an insulation layer. Exemplarily, the insulation layer can be an insulation tape, which is wrapped on the surface of the steel strand 53. When the steel strand 53 is anchored and connected to the main beam 7, the steel strand 53 and the main beam 7 can be isolated. When the main beam 7 is welded after being lifted into position, the welding can avoid overvoltage of the steel strand 53, thereby affecting the tensile capacity of the lifting steel strand 53. In addition, the mounting seat 52 of the first lifting device 51 can be made of an insulating material to prevent the upper end of the steel strand 53 from being overvoltage by the steel truss 4.

[0044] In some optional embodiments, referring to Figures 1 to 5As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, and the second lifting assembly 6 of the large-span cable-stayed steel truss bridge steel tower beam lifting device comprises a distribution beam 61 arranged on the top of the two transverse truss pieces 41, and a second lifting device 62 installed on the distribution beam 61 and used for connecting the main beam 7.

[0045] The second lifting assembly 6 of the embodiment of the present application comprises the distribution beam 61 arranged on the top of the two transverse truss pieces 41, and the second lifting device 62 is installed on the distribution beam 61. The distribution beam 61 can effectively distribute the load to the two transverse truss pieces 41, thereby ensuring the lifting reliability. For example, the second lifting device 62 of the embodiment can adopt an electric hoist.

[0046] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, and the large-span cable-stayed steel truss bridge steel tower beam lifting device further comprises a control unit used for controlling the first lifting assembly 5 and the second lifting assembly 6 to synchronously or asynchronously lift the main beam 7.

[0047] The control unit of the embodiment of the present application adopts a computer, the first lifting assembly 5 adopts a hydraulic jack, and the second lifting assembly 6 adopts an electric hoist. During the lifting process, four hydraulic jacks can be controlled to synchronously lift, and an electric hoist is used for auxiliary lifting at the transverse mid-span position, so as to ensure the posture stability of the main beam 7 during the lifting and prevent the overturning of the main beam 7. Alternatively, one hydraulic jack can be controlled to lift, and the lifting posture of the main beam 7 is finely adjusted, so as to ensure the smooth passing of the main beam 7 through the interface position on the main tower 2.

[0048] It should be noted that the present application can be operated by a computer-controlled hydraulic jack cluster, the steel strand 53 is used as a bearing component, the hydraulic jack is used as an execution component, and the electrical and computer systems are used as control components. The main tower 2 serves as the foundation of the bearing jack group and bears the weight of all the lifted structures and tools. The steel strand 53 serves as a lifting rigging and cooperates with the jaw anchor of the hydraulic jack to transmit the lifting force, so as to realize the lifting and locking of the structural members during the lifting process.

[0049] The hydraulic jack is powered by a hydraulic pump station, and the lifting action is realized by the rising and shrinking of the oil cylinder and the alternative replacement of the upper and lower anchors. The electrical and computer systems issue various operation commands according to the signals of various position and load sensors and the requirements of synchronous (asynchronous) or load control. The computer-controlled hydraulic jack cluster operation equipment performs the overall lifting operation of the steel structure, has the advantages of flexible combination, fine control, high automation degree, and can realize the overall lifting of large and super-heavy structures.

[0050] In some optional embodiments, referring to Figures 1 to 5As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the steel truss 4 of the large-span cable-stayed steel truss bridge steel tower beam lifting device is provided with a falling prevention rope for connecting the main beam 7, and the main beam 7 is provided with a lifting lug for connecting the falling prevention rope.

[0051] The main beam 7 of the embodiment of the present application is welded with a lifting lug, when the main beam 7 is lifted in place and welded with the interface on the main tower 2, the main beam 7 and the lifting lug can be connected together by the falling prevention rope, and the lifting operation safety is ensured. As an example, the falling prevention rope of the embodiment of the present application can adopt a steel wire rope, and the connection reliability is ensured.

[0052] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the large-span cable-stayed steel truss bridge steel tower beam lifting device further comprises a support assembly 3 arranged on the top of the main tower 2 and used for mounting the steel truss 4, the support assembly 3 comprises a first pad beam 31 connected to the bottom end of the transverse truss piece 41, and a second pad beam 32 supporting two ends of the first pad beam 31.

[0053] The support assembly 3 of the embodiment of the present application comprises the first pad beam 31 and the second pad beam 32, the two ends of the first pad beam 31 are welded with the second pad beam 32, when installed, the first pad beam 31 is welded and fixed with the transverse truss piece 41, and the second pad beam 32 is welded and fixed with the top of the main tower 2, so that the steel truss 4 can be stably supported.

[0054] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the number of the connection system 42 of the large-span cable-stayed steel truss bridge steel tower beam lifting device is multiple groups, the connection system 42 comprises mutually parallel upper chords and lower chords, and diagonal struts connecting the upper chords and the lower chords.

[0055] The connection system 42 of the embodiment of the present application is multiple groups and is installed along the length direction of the transverse truss piece 41, the connection system 42 comprises mutually parallel upper chords and lower chords, the two ends of the upper chords and the lower chords are respectively welded and fixed with two transverse truss pieces 41, and at the same time, diagonal struts are welded between the upper chords and the lower chords, so that the two transverse truss pieces 41 can form a stable overall load-bearing structure.

[0056] In some optional embodiments, referring to Figures 1 to 5 As shown, the embodiment of the present application provides a large-span cable-stayed steel truss bridge steel tower beam lifting device, the large-span cable-stayed steel truss bridge steel tower beam lifting device further comprises multiple groups of cradles 8 arranged on the bridge main beam 1, and the cradles 8 are used for supporting the main beam 7.

[0057] The bridge main girder 1 of the embodiment of the present application is fixedly installed with multiple groups of cradles 8, which facilitates assembling the main cross beam 7 on the multiple groups of cradles 8. For example, after the main tower 2 is assembled on the bridge main girder 1, the main cross beam 7 needs to be lifted and the cradles 8 are arranged on the bridge deck. The block sections are precisely positioned, assembled and welded on the cradles 8 to form the main cross beam 7. The cradles 8 and the block sections are staggered according to the position of the weld.

[0058] Specifically, for the process of high-altitude installation of large steel structure components in the prior art, due to the large installation height, the single weight of the component parts is large, and a large amount of large-section newly-made auxiliary steel structures and large-tonnage mechanical equipment must be used, and a large number of high-altitude operation auxiliary platforms and safety devices need to be arranged during the installation process, the present application further provides a method for installing a steel tower cross beam of a large-span cable-stayed steel truss girder bridge, which comprises the following steps:

[0059] Step one, multiple groups of cradles 8 are installed at the mileage center positions of the main tower 2 of the bridge main girder 1.

[0060] Step two, the main cross beam 7 parts are assembled on the cradles 8, and after the main cross beam 7 parts are hoisted and positioned, they are sequentially welded, the welding flaw detection and coating operation are completed, and the position deviation of the main cross beam 7 from the installation position is reviewed.

[0061] Step three, a support assembly 3 is arranged at the top of the main tower 2, and a steel truss 4 is installed, which is hoisted and installed in groups by using a truck crane. A first lifting device 51 is installed, and the position and perpendicularity are adjusted to ensure the stability during lifting.

[0062] Step four, a steel strand 53 is installed, which is constructed by using a threading machine, and the steel strand 53 is manually threaded from the inside. After four steel strands 53 are threaded, they are anchored and pre-tightened on the main cross beam 7, the tightness of the steel strand 53 is confirmed, and the phenomena of twisting and relaxation are strictly prohibited.

[0063] Step five, the single stroke lifting height of the first lifting device 51 is twenty centimeters, and six strokes form a group. During the lifting process, the second lifting assembly 6 is used for assistance to ensure the stability of the posture of the main cross beam 7 during lifting.

[0064] After one group is completed, the lifting posture of the main cross beam 7 is measured, and the height difference of the four corners is controlled within five millimeters. If the posture deviates greatly, the first lifting device 51 at the deviation position needs to be operated alone to adjust the posture, and then the lifting is continued.

[0065] Step six, the main cross beam 7 is lifted to the designed position, a fall-preventing rope is arranged on the steel truss 4 to connect the lifting lug on the main cross beam 7, a code plate is welded to the butt joint of the main cross beam 7, and welding construction is performed.

[0066] The application can realize accurate installation of the main cross beam 7, avoid instability risks caused by use of large lifting equipment and super-high support. Through the construction method, the risk of lifting the main cross beam 7 is reduced, the on-site construction efficiency is improved, and the key time of the bridge construction period is saved.

[0067] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. 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.

[0068] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0069] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of 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 these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A large-span cable-stayed steel truss bridge steel tower beam lifting device, characterized in that, The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge comprises a steel truss (4) extending along the transverse direction of the bridge and erected on the top of two main towers (2), two transverse truss pieces (41) arranged side by side, and a connecting system (42) connecting the two transverse truss pieces (41); a lifting mechanism comprising a first lifting assembly (5) arranged at the two ends of each transverse truss piece (41) respectively, and a second lifting assembly (6) arranged in the plane formed by the first lifting assemblies (5), the first lifting assembly (5) and the second lifting assembly (6) being used to lift the main transverse beam (7) between the two main towers (2).

2. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 1, wherein the first lifting assembly (5) comprises a first lifting device (51) arranged on the transverse truss piece (41), and a steel strand (53) connected to the first lifting device (51) and used to connect the main transverse beam (7).

3. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 2, wherein the transverse truss piece (41) is a hollow rectangular frame in cross section, and the first lifting device (51) is arranged on the transverse truss piece (41) through a mounting seat (52), and the steel strand (53) penetrates through the transverse truss piece (41).

4. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 2, wherein an insulating layer is arranged on the outer surface of the steel strand (53) to prevent overcurrent of the steel strand (53).

5. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 2, wherein the second lifting assembly (6) comprises a distribution beam (61) erected on the top of the two transverse truss pieces (41), and a second lifting device (62) arranged on the distribution beam (61) and used to connect the main transverse beam (7).

6. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 1, further comprising a control unit used to control the first lifting assembly (5) and the second lifting assembly (6) to synchronously or asynchronously lift the main transverse beam (7).

7. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 1, wherein a fall-preventing rope is arranged on the steel truss (4) and used to connect the main transverse beam (7), and a lifting lug is arranged on the main transverse beam (7) and used to connect the fall-preventing rope.

8. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 1, further comprising a support assembly (3) arranged on the top of the main tower (2) and used to support the steel truss (4), the support assembly (3) comprising a first pad beam (31) connected to the bottom end of the transverse truss piece (41), and a second pad beam (32) supporting the two ends of the first pad beam (31).

9. The steel tower beam lifting device for long-span cable-stayed steel truss girder bridge according to claim 1, wherein the connecting system (42) comprises a plurality of groups of upper chords and lower chords parallel to each other, and diagonal struts connecting the upper chords and the lower chords. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. The steel tower beam lifting device for long-span cable-stayed steel truss bridge according to claim 1, characterized in that: Further comprising a plurality of groups of jigs (8) arranged at intervals on the bridge main beam (1), and the jigs (8) are used to support the main cross beam (7).

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