A steel truss girder segment lifting device and lifting method for a steel truss girder cable-stayed bridge

Abstract

The present application discloses a steel truss segment lifting device for a steel truss cable-stayed bridge and a lifting method thereof, which comprises a bridge crane, a guide rail, a beam transport trolley, a fixed frame and a movable frame, wherein the cantilever frame of the bridge crane is provided with a lifting mechanism; the guide rail is provided at the bottom of the steel truss segment, and a plurality of guide rails are spliced ​​at the bottom of the steel truss body 2 to form a sliding track; the beam transport trolley is slidably connected to the sliding track, the movable frame is an equilateral triangle, and the three corners of the movable frame serve as a first connection point, a second connection point and a third connection point respectively, the first connection point is hinged to the lower end of the fixed frame, the second connection point is hinged to the upper surface of the steel truss segment, and the third connection point is connected to the traction rope of the lifting mechanism; the initial positions of the first connection point and the second connection point are both located on the vertical extension line of the fixed frame, and the initial position of the third connection point is located directly below the lifting mechanism. The present application has the effect of improving the convenience, fluency and stability of segment beam lifting construction.

Description

Technical Field

[0001] The present application relates to the field of steel truss cable-stayed bridge construction, and in particular to a steel truss segment lifting device and a lifting method thereof for a steel truss cable-stayed bridge. Background Art

[0002] Steel truss cable-stayed bridges are made of multiple steel truss segments. They have the advantages of large width, light weight and easy transportation. The steel truss segments are hoisted and assembled one by one, so that the main body of the steel truss is extended until the steel truss unloading bridge is formed. However, the hoisting of steel truss segments is relatively troublesome and has high requirements on the site and environment. With the application of the technology of transporting steel trusses under the beam, the impact of the environment on construction can be reduced.

[0003] In the related technology, patent number CN105200923B discloses a lifting device used in the field of bridge construction and the lifting method used therein, which sets a front longitudinal lifting point and a rear longitudinal lifting point on the top surface of the segmental beam to cooperate with the front beam transport trolley and the rear beam transport trolley under the beam to move the segmental beam to a position below the end of the beam body. In addition, a rear lifting lifting point is set on the top surface of the segmental beam, and a group of cantilever beams are cantilevered at the end of the segmental beam, and a front lifting lifting point is set on the top surface of the cantilever beam, and the lifting and adjustment into place are achieved by cooperating with the front lifting trolley and the rear lifting trolley of the bridge deck crane.

[0004] With regard to the above-mentioned related technologies, there are the following defects: in order to transfer the segmental beam suspended under the front beam transport trolley and the rear beam transport trolley to the cantilever arm of the bridge crane, the actual operation is relatively difficult. It is necessary to first connect the front crane cable of the front lifting trolley of the bridge crane with the front lifting lifting point of the cantilever beam, and then unlock the connection between the rear front longitudinal movement lifting point and the front beam transport trolley, and then move the front lifting trolley and the rear beam transport trolley at the same time to move the segmental beam forward a certain distance, and then connect the rear crane cable of the rear lifting trolley with the rear lifting lifting point, and unlock the rear longitudinal movement lifting point. Move the connection between the lifting point and the rear beam transport trolley, and then move the front lifting trolley and the rear lifting trolley at the same time, so that the segmental beam is moved to just below the installation position of the segmental beam, and the segmental beam is put into place by lifting the front and rear crane cables. This lifting method is cumbersome, the movement stability is not high, the smoothness is poor, and it is difficult for construction workers to operate. In addition, the transition is achieved by using a cantilever beam. The cantilever beam needs to bear part of the load of the segmental beam, and it is easy to bend after repeated use. The use process will affect the stability of normal lifting, so there is still room for improvement. Summary of the invention

[0005] In order to improve the convenience, fluency and stability of segmental beam lifting construction, the present application provides a steel truss beam segment lifting device and a lifting method for the steel truss beam of a cable-stayed bridge.

[0006] The present application provides a steel truss girder segment lifting device and a lifting method thereof for a steel truss girder cable-stayed bridge, which adopts the following technical solutions:

[0007] A steel truss girder segment lifting device for a steel truss girder cable-stayed bridge, comprising:

[0008] A bridge crane, the bridge crane slides along the bridge direction on the upper surface of the steel truss girder body, and the cantilever frame of the bridge crane is provided with a lifting mechanism;

[0009] A guide rail, wherein the guide rail is arranged at the bottom of the steel truss segment, and a plurality of guide rails are spliced ​​at the bottom of the steel truss body to form a sliding track, and the sliding track extends along the bridge direction;

[0010] A beam transport trolley, the beam transport trolley is slidably connected to the sliding track, and the beam transport trolley is used to transport the steel truss beam segment to below the end of the steel truss beam body;

[0011] A fixing frame, the fixing frame is mounted on the beam transporting trolley and extends vertically downward;

[0012] A movable frame, the movable frame is an equilateral triangle, the three corners of the movable frame are respectively used as a first connection point, a second connection point and a third connection point, the first connection point is hinged to the lower end of the fixed frame, the second connection point is hinged to the upper surface of the steel truss segment, and the third connection point is used to connect with the traction rope of the lifting mechanism;

[0013] Before lifting the steel truss girder segment, the steel truss girder segment is suspended below the beam transport trolley through a fixed frame and a movable frame, the initial positions of the first connection point and the second connection point are both located on the vertical extension line of the fixed frame, and the initial position of the third connection point is located directly below the lifting mechanism;

[0014] When adjusting the position of the steel truss girder segment, the traction rope of the lifting mechanism is connected to the third connection point, the lifting mechanism drives the third connection point to move upward by lifting the movable frame vertically upward, and the second connection point swings to the initial position of the third connection point, the traction rope, the third connection point and the second connection point are on the same vertical line, and the steel truss girder segment moves to the bottom of the lifting mechanism;

[0015] The first connection point is detachably connected to the fixing frame.

[0016] By adopting the above technical scheme, a vertical fixed frame and a movable frame are arranged under the beam transport trolley, the movable frame is hinged to the fixed frame, and the movable frame is hinged to the surface of the steel truss beam segment, so as to achieve the purpose of synchronous movement of the beam transport trolley and the steel truss beam segment. Under the gravity of the steel truss beam segment, the initial positions of the first connection point and the second connection point are both located on the vertical extension line of the fixed frame, the steel truss beam and the movable frame can be maintained in a stable state, and the third connection point is stably cantilevered to the bottom of the lifting mechanism, which is convenient for construction workers to connect the traction rope with the movable frame. In addition, the equilateral triangle geometric characteristics of the movable frame are utilized, and then the third connection point is driven to The connection point moves up, and the second connection point can be moved to the initial position of the third connection point at the same time, thereby achieving the purpose of stable forward movement of the steel truss segment. In addition, the traction rope, the third connection point and the second connection point can also be in the same vertical line. Under the gravity of the steel truss segment and the lifting action of the traction mechanism, the traction mechanism, the movable frame and the steel truss are kept in a stable state of force balance, which is convenient for disassembly of the first connection point and the fixed frame, and then the steel truss segment can be put into place at the end of the steel truss body through vertical lifting, which is beneficial to improve the overall convenience, smoothness and stability of the segment beam lifting construction.

[0017] Preferably, a lifting platform and a driving member for driving the lifting platform to rise and fall are provided below the beam transport trolley, a through slot is provided through the lifting platform, and the fixing frame is provided through the through slot.

[0018] By adopting the above technical solution, the lifting platform is driven by the driving member to lift and lower, and the construction workers can reach the connection point between the fixed frame and the movable frame through the lifting platform, which is convenient for the disassembly steps between the fixed frame and the movable frame, and is beneficial to improving the convenience and safety of steel truss lifting construction.

[0019] Preferably, the lifting mechanism is longitudinally slidably connected to the cantilever frame of the bridge crane, and the bridge crane is provided with a transmission member for driving the lifting mechanism to move longitudinally.

[0020] By adopting the above technical solution, the lifting mechanism can adjust the longitudinal position under the drive of the transmission member, which is convenient for fine-tuning the position of the steel truss segment and facilitating the connection between the steel truss segment and the steel truss body.

[0021] Preferably, the movable frame includes a straight rod and a V-shaped rod, the straight rod and the V-shaped rod are detachably connected, the first connection point is located at the bend of the V-shaped rod, and the second connection point and the third connection point are respectively located at two ends of the straight rod.

[0022] By adopting the above technical solution, the movable frame is set as a detachable structure. After the steel truss segment completes the adjustment action through the lifting mechanism and the movable frame, the straight rod and the traction rope are in the same straight line. Then, by removing the V-shaped rod of the movable frame, the impact of the collision between the movable frame and the steel truss main body during the rising process of the steel truss segment can be eliminated. The steel truss segment can be directly lifted to reach the predetermined installation position without adjustment, thereby further improving the smoothness of the lifting and installation of the steel truss segment, which is conducive to improving construction efficiency.

[0023] Preferably, the lifting platform extends in the direction of the traction rope of the lifting mechanism, and the straight line where the traction rope and the straight rod are located is passed through the through groove.

[0024] By adopting the above technical solution, the overall length of the lifting platform is extended, thereby covering the connection point between the straight rod and the V-shaped rod, making it easy to disassemble the straight rod and the V-shaped rod.

[0025] A method for lifting a steel truss girder segment of a steel truss girder cable-stayed bridge adopts a steel truss girder segment lifting device of a steel truss girder cable-stayed bridge, comprising the following steps:

[0026] S1: The beam transport trolley transports the steel truss segment to the bottom of the end of the steel truss main body, and the cantilever frame of the bridge crane is cantilevered to the top of the predetermined installation position of the steel truss segment;

[0027] S2: The traction rope of the lifting mechanism is connected to the third connection point of the movable frame, and the movable frame is lifted upward, driving the third connection point to move upward, and the second connection point of the movable frame swings to the initial position of the third connection point. The traction rope, the third connection point and the second connection point are on the same vertical line, and the steel truss segment follows the second connection point to move to the bottom of the lifting mechanism;

[0028] S3: Separate the movable frame from the fixed frame, and then fine-tune the position of the lifting mechanism through the transmission parts to separate the movable frame from the fixed frame;

[0029] S4: Then continue to start the lifting mechanism, lift the steel truss segment to the predetermined installation position, assemble the steel truss segment and the steel truss body, and then connect the guide rail under the steel truss segment with the guide rail under the steel truss body to form a sliding track.

[0030] By adopting the above technical solution and utilizing the equilateral triangle geometric characteristics of the movable frame, the lifting mechanism drives the third connection point to move upward, and at the same time, the second connection point can just move to the initial position of the third connection point, thereby achieving the purpose of stable forward movement of the steel truss segment. In addition, the traction rope, the third connection point and the second connection point can also be on the same vertical line. Under the gravity of the steel truss segment and the lifting action of the traction mechanism, the traction mechanism, the movable frame and the steel truss are maintained in a stable state of force balance, which facilitates the disassembly of the first connection point and the fixed frame, and then the steel truss segment can be put into place at the end of the steel truss body by vertical lifting, which is beneficial to overall improvement of the convenience, smoothness and stability of the segment beam lifting construction.

[0031] Preferably, in the step of separating the fixed frame from the movable frame in S3, the lifting platform is driven down by the driving member, and the connection between the fixed frame and the movable frame passes through the through slot and enters the lifting platform.

[0032] By adopting the above technical solution, the disassembly steps between the fixed frame and the movable frame are facilitated, which is beneficial to improving the convenience and safety of the steel truss lifting construction.

[0033] A method for lifting a steel truss girder segment of a steel truss girder cable-stayed bridge adopts a steel truss girder segment lifting device of a steel truss girder cable-stayed bridge, comprising the following steps:

[0034] S1: The beam transport trolley transports the steel truss segment to the bottom of the end of the steel truss main body, and the cantilever frame of the bridge crane is cantilevered to the top of the predetermined installation position of the steel truss segment;

[0035] S2: The traction rope of the lifting mechanism is connected to the third connection point of the movable frame, and the movable frame is lifted upward, driving the third connection point to move upward, and the second connection point of the movable frame swings to the initial position of the third connection point. The traction rope, the third connection point and the second connection point are on the same vertical line, and the steel truss segment follows the second connection point to move to the bottom of the lifting mechanism;

[0036] S3: Separate the straight rod and V-shaped rod in the movable frame;

[0037] S4: Then continue to start the lifting mechanism, lift the steel truss segment to the predetermined installation position, assemble the steel truss segment and the steel truss body, and then connect the guide rail under the steel truss segment with the guide rail under the steel truss body to form a sliding track.

[0038] By adopting the above technical solution and removing the V-shaped rod of the movable frame, the impact of the collision between the movable frame and the steel truss main body during the rising of the steel truss segment can be eliminated. The steel truss segment can be directly lifted to reach the predetermined installation position without adjustment, thereby further improving the smoothness of the lifting and installation of the steel truss segment, which is conducive to improving construction efficiency.

[0039] In summary, the present application includes at least one of the following beneficial technical effects:

[0040] 1. By utilizing the equilateral triangle geometric characteristics of the movable frame, the lifting mechanism drives the third connection point to move upward, and the second connection point can just move to the initial position of the third connection point, thereby achieving the purpose of stable forward movement of the steel truss beam segment. In addition, the traction rope, the third connection point and the second connection point can also be on the same vertical line. Under the gravity of the steel truss beam segment and the lifting action of the traction mechanism, the traction mechanism, the movable frame and the steel truss beam are kept in a stable state of force balance, which is convenient for disassembly of the first connection point and the fixed frame. Then, the steel truss beam segment can be placed at the end of the steel truss beam body by vertical lifting, which is conducive to improving the convenience, smoothness and stability of the segment beam lifting construction as a whole;

[0041] 2. Through the setting of the lifting platform and the through slot, the construction workers can reach the connection point between the fixed frame and the movable frame through the lifting platform, which is convenient for the disassembly steps between the fixed frame and the movable frame, and is conducive to improving the convenience and safety of the steel truss lifting construction;

[0042] 3. Set the movable frame as a detachable structure, split into straight rods and V-shaped rods. After the steel truss segment completes the adjustment action through the lifting mechanism and the movable frame, the straight rod and the traction rope are in the same straight line. Then, by removing the V-shaped rod of the movable frame, the impact of the collision between the movable frame and the steel truss main body during the rising process of the steel truss segment can be eliminated. The steel truss segment can be directly lifted to the predetermined installation position without adjustment, which further improves the smoothness of the lifting and installation of the steel truss segment and is conducive to improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the state of the fixed frame, the movable frame and the steel truss segment when the steel truss segment is under force balance before adjustment in a steel truss segment lifting device for a steel truss cable-stayed bridge in Example 1 of the present application.

[0044] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0045] Figure 3 It is a schematic diagram of the state of the traction rope, movable frame and steel truss segment when the force of the steel truss segment in the steel truss segment lifting device of the steel truss cable-stayed bridge is balanced after the steel truss segment is adjusted in Example 1 of the present application.

[0046] Figure 4 It is a schematic diagram of the state of the fixed frame, the movable frame and the steel truss segment when the steel truss segment is under force balance before adjustment in a steel truss segment lifting device for a steel truss cable-stayed bridge in Example 2 of the present application.

[0047] Figure 5 It is a schematic diagram of the state of splitting the straight rods and V-shaped rods after the steel truss segments in a steel truss segment lifting device for a steel truss cable-stayed bridge in Example 2 of the present application.

[0048] Figure 6 This is a schematic diagram of the state after the straight rods and V-shaped rods in a steel truss segment lifting device for a steel truss cable-stayed bridge in Example 2 of the present application are separated.

[0049] Explanation of the reference numerals in the accompanying drawings: 1. Bridge crane; 11. Cantilever frame; 12. Lifting mechanism; 121. Traction rope; 13. Transmission member; 2. Steel truss main body; 3. Guide rail; 4. Lifting platform; 41. Through groove; 5. Steel truss segment; 51. Mounting seat; 6. Movable frame; 61. First connection point; 62. Second connection point; 63. Third connection point; 64. Straight rod; 65. V-shaped rod; 7. Fixed frame; 8. Beam transport trolley; 81. Driving member; 82. Fixed seat. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-6 This application is described in further detail.

[0051] Example 1

[0052] The present application embodiment discloses a steel truss girder segment lifting device for a steel truss girder cable-stayed bridge, comprising:

[0053] The bridge crane 1 slides along the bridge direction on the upper surface of the steel truss girder body 2, and the cantilever frame 11 of the bridge crane 1 is equipped with a lifting mechanism 12. Specifically, the lifting mechanism 12 is a continuous lifting jack, and the lifting mechanism 12 is longitudinally slidably connected to the cantilever frame 11 of the bridge crane 1. The cantilever frame 11 of the bridge crane 1 is equipped with a transmission member 13 that drives the lifting mechanism 12 to move longitudinally, and the transmission member 13 is specifically a screw transmission mechanism.

[0054] The guide rail 3 is installed at the bottom of the steel truss girder segment 5. In this embodiment, the guide rail 3 is made of I-beam. Each steel truss girder segment 5 corresponds to two guide rails 3. A plurality of guide rails 3 are spliced ​​at the bottom of the steel truss girder body 2 to form two sliding tracks, which extend along the bridge direction.

[0055] The beam transport trolley 8 is slidably connected to the sliding track and can be driven by a motor to move the beam transport trolley 8. The beam transport trolley 8 is used to transport the steel truss beam segment 5 to the bottom of the end of the steel truss beam body 2.

[0056] The fixing frame 7 is installed at the bottom of the beam transporting trolley 8 and extends vertically downward.

[0057] The movable frame 6 is an equilateral triangle, and the three corners of the movable frame 6 serve as a first connection point 61, a second connection point 62 and a third connection point 63 respectively. The first connection point 61 is hinged to the lower end of the fixed frame 7, the second connection point 62 is hinged to the mounting seat 51 on the upper surface of the steel truss segment 5, and the third connection point 63 is used to connect with the traction rope 121 of the lifting mechanism 12.

[0058] Before lifting the steel truss segment 5, the steel truss segment 5 is suspended under the beam transport trolley 8 through the fixed frame 7 and the movable frame 6, and transported to the bottom of the end of the steel truss body 2. The initial positions of the first connection point 61 and the second connection point 62 are both located on the vertical extension line of the fixed frame 7, and the initial position of the third connection point 63 is located directly below the lifting mechanism 12.

[0059] When adjusting the position of the steel truss segment 5, the traction rope 121 of the lifting mechanism 12 is connected to the third connection point 63. The lifting mechanism 12 lifts the movable frame 6 vertically upward, drives the third connection point 63 to move upward, and the second connection point 62 swings to the initial position of the third connection point 63. The traction rope 121, the third connection point 63 and the second connection point 62 are on the same vertical line, and the steel truss segment 5 moves to be directly below the lifting mechanism 12.

[0060] In order to improve the convenience and safety of the steel truss lifting construction, a lifting platform 4 and a driving member 81 for driving the lifting platform 4 to rise and fall are arranged under the beam transport trolley 8. A through slot 41 is vertically penetrated through the lifting platform 4, and the end of the through slot 41 is opened, and the fixed frame 7 is passed through the through slot 41. Specifically, the driving member 81 is four sets of winches, which are respectively installed and fixed on both sides of the beam transport trolley 8 through the fixing seat 82. The lifting platform 4 is suspended under the beam transport trolley 8 through the connecting ropes of the four sets of winches. The lifting platform 4 is driven to descend by the winch, and the construction personnel can reach the connection point between the fixed frame 7 and the movable frame 6 through the lifting platform 4, which is convenient for the disassembly steps between the fixed frame 7 and the movable frame 6.

[0061] Embodiment 1 of the present application also discloses a method for lifting a steel truss girder segment of a steel truss girder cable-stayed bridge, using a steel truss girder segment lifting device for a steel truss girder cable-stayed bridge, comprising the following steps:

[0062] S1: The beam transport trolley 8 transports the steel truss segment 5 to the bottom of the end of the steel truss body 2, and the cantilever frame 11 of the bridge crane 1 is cantilevered to the top of the predetermined installation position of the steel truss segment 5. At this time, the initial positions of the first connection point 61 and the second connection point 62 are both located on the vertical extension line of the fixed frame 7, the center of gravity of the steel truss segment 5 falls on the vertical plane where the two fixed frames 7 are located, and the initial position of the third connection point 63 is located directly below the lifting mechanism 12; the fixed frame 7, the movable frame 6 and the steel truss segment 5 are in a state of force balance.

[0063] S2: The traction rope 121 of the lifting mechanism 12 is connected to the third connection point 63 of the movable frame 6, and the movable frame 6 is lifted upward, driving the third connection point 63 to move upward, and the second connection point 62 of the movable frame 6 swings to the initial position of the third connection point 63. The traction rope 121, the third connection point 63 and the second connection point 62 are on the same vertical line, and the steel truss segment 5 follows the second connection point 62 to move to the bottom of the lifting mechanism 12. At this time, the traction rope 121 of the lifting mechanism 12, the movable frame 6 and the steel truss segment 5 are in a state of force balance. The lifting mechanism 12 stops the lifting step.

[0064] S3: Separate the movable frame 6 from the fixed frame 7. In the step of separating the fixed frame 7 from the movable frame 6, the lifting platform 4 is driven down by the driving member 81, and the connection between the fixed frame 7 and the movable frame 6 passes through the through slot 41 and enters the lifting platform 4. The construction personnel separate the connection between the fixed frame 7 and the movable frame 6, and then fine-tune the position of the lifting mechanism 12 through the transmission member 13 to separate the movable frame 6 from the fixed frame 7.

[0065] S4: Continue to start the lifting mechanism 12, lift the steel truss segment 5 to the predetermined installation position, and then assemble the steel truss segment 5 and the steel truss body 2, and then connect the guide rail 3 under the steel truss segment 5 with the guide rail 3 under the steel truss body 2 to form a sliding track, waiting for the beam transport trolley 8 to transport the next steel truss segment 5.

[0066] The difference between Example 2 and Example 1 is that:

[0067] In the steel truss cable-stayed bridge steel truss segment lifting device of Example 2, the movable frame 6 includes a straight rod 64 and a V-shaped rod 65, the straight rod 64 and the V-shaped rod 65 are detachably connected, and the straight rod 64 and the V-shaped rod 65 are locked by bolts. The first connection point 61 of the movable frame 6 is located at the bend of the V-shaped rod 65, and the second connection point 62 and the third connection point 63 of the movable frame 6 are respectively located at both ends of the straight rod 64.

[0068] In addition, the lifting platform 4 extends toward the traction rope 121 of the lifting mechanism 12, and the traction rope 121 and the straight line of the straight rod 64 are passed through the through groove 41. By extending the overall length of the lifting platform 4, the connection point between the straight rod 64 and the V-shaped rod 65 is covered, which facilitates the disassembly of the straight rod 64 and the V-shaped rod 65.

[0069] The method for lifting the steel truss girder segment of the steel truss girder cable-stayed bridge in Example 2 adopts the lifting device for the steel truss girder segment of the steel truss girder cable-stayed bridge in Example 2, which is different from Example 1 in that in step S3, the straight rod 64 and the V-shaped rod 65 in the movable frame 6 are separated, and then the beam transport trolley 8 transports the separated V-shaped rod 65 back, thereby realizing the separation of the straight rod 64 and the V-shaped rod 65. The movable frame 6 is set as a detachable structure. After the steel truss segment is adjusted by the lifting mechanism 12 in cooperation with the movable frame 6, the straight rod 64 and the traction rope 121 are in the same straight line. Then, by removing the V-shaped rod 65 of the movable frame 6, the impact of the collision between the movable frame 6 and the steel truss girder body 2 during the rising process of the steel truss segment can be eliminated. The steel truss girder segment 5 can be directly lifted to reach the predetermined installation position without adjustment, further improving the smoothness of the lifting and installation of the steel truss girder segment 5, which is conducive to improving the construction efficiency.

[0070] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for lifting a steel truss girder segment of a steel truss girder cable-stayed bridge, using a steel truss girder segment lifting device for a steel truss girder cable-stayed bridge, characterized in that: The steel truss girder segment lifting device of a steel truss girder cable-stayed bridge comprises: A bridge crane (1), the bridge crane (1) slides along the direction of the bridge on the upper surface of the steel truss girder body (2), and the cantilever frame (11) of the bridge crane (1) is provided with a lifting mechanism (12); A guide rail (3), wherein the guide rail (3) is arranged at the bottom of the steel truss beam segment (5), and a plurality of guide rails (3) are spliced ​​at the bottom of the steel truss beam body (2) to form a sliding track, wherein the sliding track extends along the bridge direction; A beam transport trolley (8), the beam transport trolley (8) is slidably connected to the sliding track, and the beam transport trolley (8) is used to transport the steel truss beam segment (5) to below the end of the steel truss beam body (2); A fixing frame (7), the fixing frame (7) being mounted on the beam transporting trolley (8) and extending vertically downward; A movable frame (6), the movable frame (6) is in the shape of an equilateral triangle, the three corners of the movable frame (6) are respectively used as a first connection point (61), a second connection point (62) and a third connection point (63), the first connection point (61) is hinged to the lower end of the fixed frame (7), the second connection point (62) is hinged to the upper surface of the steel truss segment (5), and the third connection point (63) is used to connect to the traction rope (121) of the lifting mechanism (12); Before lifting the steel truss girder segment (5), the steel truss girder segment (5) is suspended below the girder transport trolley (8) via a fixed frame (7) and a movable frame (6), the initial positions of the first connection point (61) and the second connection point (62) are both located on the vertical extension line of the fixed frame (7), and the initial position of the third connection point (63) is located directly below the lifting mechanism (12); When adjusting the position of the steel truss girder segment (5), the traction rope (121) of the lifting mechanism (12) is connected to the third connection point (63), the lifting mechanism (12) drives the third connection point (63) to move upward by lifting the movable frame (6) vertically upward, and the second connection point (62) swings to the initial position of the third connection point (63), the traction rope (121), the third connection point (63) and the second connection point (62) are on the same vertical line, and the steel truss girder segment (5) moves to the bottom of the lifting mechanism (12); The first connection point (61) is detachably connected to the fixing frame (7); The method for lifting steel truss girder segments of a steel truss cable-stayed bridge comprises the following steps: S1: The beam transport trolley (8) transports the steel truss beam segment (5) to the bottom of the end of the steel truss beam body (2), and the cantilever frame (11) of the bridge crane (1) is cantilevered to the top of the predetermined installation position of the steel truss beam segment (5); S2: The traction rope (121) of the lifting mechanism (12) is connected to the third connection point (63) of the movable frame (6), and the movable frame (6) is lifted upward, driving the third connection point (63) to move upward, and the second connection point (62) of the movable frame (6) swings to the initial position of the third connection point (63), the traction rope (121), the third connection point (63) and the second connection point (62) are on the same vertical line, and the steel truss girder segment (5) follows the second connection point (62) and moves to the bottom of the lifting mechanism (12); S3: Separate the movable frame (6) and the fixed frame (7), and then fine-tune the position of the lifting mechanism (12) through the transmission member (13) to separate the movable frame (6) from the fixed frame (7); S4: Then, the lifting mechanism (12) is started to lift the steel truss segment (5) to the predetermined installation position, and the steel truss segment (5) and the steel truss body (2) are assembled, and then the guide rail (3) under the steel truss segment (5) is connected to the guide rail (3) under the steel truss body (2) to form a sliding track.

2. The method for hoisting steel truss girder segments of a steel truss girder cable-stayed bridge according to claim 1, characterized in that: A lifting platform (4) and a driving member (81) for driving the lifting platform (4) to move up and down are arranged below the beam transport trolley (8); a through slot (41) is provided through the lifting platform (4), and the fixing frame (7) is inserted into the through slot (41).

3. The method for hoisting steel truss girder segments of a steel truss girder cable-stayed bridge according to claim 1, characterized in that: The lifting mechanism (12) is longitudinally slidably connected to the cantilever frame (11) of the bridge crane (1), and the bridge crane (1) is provided with a transmission member (13) for driving the lifting mechanism (12) to move longitudinally.

4. The method for hoisting steel truss girder segments of a steel truss girder cable-stayed bridge according to claim 2, characterized in that: The movable frame (6) comprises a straight rod (64) and a V-shaped rod (65), wherein the straight rod (64) and the V-shaped rod (65) are detachably connected, the first connection point (61) is located at the bending point of the V-shaped rod (65), and the second connection point (62) and the third connection point (63) are respectively located at two ends of the straight rod (64).

5. The method for hoisting steel truss girder segments of a steel truss girder cable-stayed bridge according to claim 4, characterized in that: The lifting platform (4) extends in the direction of the traction rope (121) of the lifting mechanism (12), and the straight line where the traction rope (121) and the straight rod (64) are located passes through the through groove (41).

6. The method for hoisting steel truss girder segments of a steel truss girder cable-stayed bridge according to claim 1, characterized in that: In the step of separating the fixed frame (7) and the movable frame (6) in S3, the lifting platform (4) is driven downward by the driving member (81), and the connection between the fixed frame (7) and the movable frame (6) passes through the through slot (41) and enters the lifting platform (4).

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