Steel truss girder pushing device and construction method thereof

Abstract

The invention relates to a steel truss girder pushing device and a construction method thereof, and belongs to the technical field of bridge construction, the steel truss girder pushing device comprises a plurality of moving mechanisms, an adjusting mechanism, an angle mechanism, a first buttress arranged on the side of a river channel and a second buttress arranged on the other side of the river channel, and the plurality of moving mechanisms are mounted on the first buttress and the second buttress; the moving mechanism abuts against the steel truss girder from the bottom and pushes the steel truss girder from the first buttress to the second buttress across the river channel; the adjusting mechanism is arranged between the symmetrically-arranged main force buttresses and connected with the moving mechanism, and the adjusting mechanism changes along with the height of the moving mechanism and adjusts the supporting force for supporting the cantilever section of the steel truss girder; the angle mechanism is arranged on the adjusting mechanism and used for detecting the bending moment of the steel truss girder, the adjusting mechanism rotates at the bottom of the steel truss girder, and the rotating direction is opposite to the direction where the bending moment occurs, so that the problems that the bending moment of the steel truss girder is likely to occur in the long-distance pushing process and the stress of a pushing point is uneven are effectively solved, and the construction efficiency and safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a steel truss main beam jacking device and a construction method thereof. Background Art

[0002] Steel trusses play an important role in bridge engineering, especially in long-span bridges. They are often used in the main structures of suspension bridges, cable-stayed bridges and drawbridges, providing the load-bearing capacity and stability of bridges. In transportation infrastructure such as highways, urban elevated roads and railways, steel trusses are used to support the beams and columns of roads and bridges to ensure the stability and safety of transportation facilities. Therefore, the steel truss jacking environment is usually in a suspended state, and temporary pillars need to be set as the jacking support points of the steel trusses.

[0003] In scenarios where temporary supports are not suitable for jacking, such as when an elevated bridge is pushed across a lane or a river, the front end of the steel truss will be in a cantilever state when the pushing distance increases, and the length of the cantilever will also increase until the steel truss reaches the next pushing support point. As the cantilever length of the steel truss increases, changes in the support reaction force and bending moment during the pushing process will also affect the equilibrium state of the steel truss, especially at the first fulcrum position behind the collapsed section, where the maximum support reaction force may occur, which may lead to an increase in the imbalance near this position.

[0004] Since the jacking of the steel truss is only achieved by the jacking device, there is no restriction on the change of bending moment during the movement of the steel truss, and the length of the steel truss is close to the length between the two jackings. Therefore, before the steel truss is about to reach the new jacking support, the cantilever of the steel truss has reached its maximum, and the jacking support located behind the jacking direction has no effect on the jacking of the steel truss. If the cantilever of the steel truss is not protected during the process, it is easy to cause the steel truss to not match the position of the jacking node that is about to arrive. At the same time, the steel truss is prone to jacking accidents in serious cases.

[0005] Therefore, it is necessary to provide a jacking device that can prevent the cantilever of the steel truss from being too long during the jacking process. Summary of the invention

[0006] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a steel truss main beam jacking device and a construction method thereof, so as to solve the problems that when it is inconvenient to set up temporary brackets for support in the existing steel truss jacking construction, the steel truss is prone to bending moment and uneven jacking force during the jacking process at a long jacking distance.

[0007] The purpose of the present invention can be achieved through the following technical solutions: A steel truss main beam pushing device comprises a moving mechanism, an adjusting mechanism, an angle mechanism, a first pier arranged at the side of a river channel, and a second pier arranged at the other side of the river channel, wherein a plurality of the moving mechanisms are installed at the first pier and the second pier; the moving mechanism abuts against the steel truss from the bottom and pushes the steel truss from the first pier across the river channel to the second pier; The first buttress comprises a main buttress and a plurality of supporting buttresses, the plurality of supporting buttresses and the main buttress are sequentially arranged along the jacking direction, and the main buttress is adjacent to the second buttress; There are two first piers, which are symmetrically arranged at the bottom of the steel truss. The adjusting mechanism is arranged between the symmetrically arranged main piers and connected to the moving mechanism. The adjusting mechanism changes with the height of the moving mechanism and adjusts the supporting force of the cantilever section of the steel truss. The angle mechanism is arranged in the adjusting mechanism to detect the bending moment of the steel truss.

[0008] Preferably, the adjustment mechanism includes a base assembly, a gear assembly and a support assembly, the base assembly is installed on the main pier, the support assembly is detachably connected to the moving mechanism, the support assembly is rotatably connected to the moving mechanism, and the support assembly is connected to the base assembly via the gear assembly for limiting the telescopic movement of the base assembly.

[0009] Preferably, the base assembly includes an outer telescopic shell, an inner fixed seat and an inner rotating seat; the inner fixed seat is fixedly arranged on the main pier, the inner rotating seat is rotatably sleeved on the inner fixed seat and the top of the inner rotating seat is rotatably connected to the outer telescopic shell, a rotating seat is arranged on the top of the outer telescopic shell, the moving mechanism is rotatably connected to the rotating seat, the supporting assembly is rotatably connected to the outer telescopic shell, and the inner rotating seat and the inner fixed seat are both located inside the outer telescopic shell.

[0010] Preferably, the gear assembly includes a first gear and a second gear, the first gear is arranged on the supporting assembly, the second gear is fixedly arranged on the top of the inner rotating seat, the first gear and the second gear are meshed to drive the inner rotating seat and the inner fixed seat to rotate; the inner rotating seat is provided with a clamping piece, the clamping piece is slidably arranged on the rotating seat, and a clamping groove is provided on the side of the inner fixed seat that contacts the inner rotating seat, the clamping piece is limitedly clamped with the clamping groove to change the vertical movement state of the inner rotating seat and the fixed seat.

[0011] Preferably, the support assembly includes a rotating shaft, two cantilever rods and a top rod; the rotating shaft is rotatably connected to the outer telescopic shell, the two cantilever rods are connected to both ends of the top rod, and the other ends of the two cantilever rods are fixedly connected to the rotating shaft; and also includes a driving assembly, the driving assembly is used to drive the rotating shaft to rotate, the top rod is located on the side of the steel truss close to the second pier, and supports the steel truss from the bottom of the steel truss upward.

[0012] Preferably, the angle mechanism comprises a fixed ring, a deflection ring, a connecting rod and an angle control plate; the fixed ring is fixedly arranged on the rotating seat, the deflection ring is fixedly mounted on the rotating shaft, one end of the connecting rod is fixedly mounted on the deflection ring, a zero point area and a deflection area are arranged on a side of the fixed ring in contact with the connecting rod, the other end of the connecting rod slides between the zero point area and the deflection area, the zero point area and the deflection area are both provided with metal sheets, the connecting rod is made of metal, and is used to connect the deflection area and the angle control plate to form a closed loop, so as to detect the deflection angles of the deflection ring and the fixed ring. Preferably, it also includes a main control system and an angle control board and a drive component electrically connected to the main control system. The angle control board uploads the detected rotation data of the rotating shaft to the main control system, and the main control system sends a rotation instruction to the drive component according to the angle data.

[0013] Preferably, the moving mechanism includes a pushing support, a moving slider and a cylinder; the pushing support is installed on the first pier and the second pier, the moving slider is installed on the pushing support for pushing the steel truss, and the cylinder is used to drive the moving slider to move.

[0014] A method for constructing a steel truss main beam comprises the following construction steps: S1: Install and debug the moving mechanism, adjustment mechanism and angle mechanism; S2: Lifting and installation of steel trusses, starting the oil cylinder to initially push the steel trusses; S3: monitor the deformation, support force change and bending moment data of steel trusses; S301: When the cantilever section of the steel truss is too long and tilts, the adjustment mechanism supports the steel truss, and the angle adjustment mechanism detects the deflection angle. The adjustment mechanism rotates in a direction opposite to the bending moment direction of the steel truss according to the deflection angle detected by the angle mechanism; S4: Repeat S2-S3 until the steel truss is pushed to the second pier.

[0015] The beneficial effects of the present invention are: The adjustment mechanism needs to rotate at the bottom of the steel truss, and the rotation direction is opposite to the direction of the bending moment, so as to offset the bending moment of the steel truss. The angle mechanism detects the angle deviation of the adjustment mechanism rotation, and drives the adjustment mechanism to rotate in the opposite direction of the bending moment of the steel truss until the angle deviation is reduced and restored to the initial state. At this time, the adjustment mechanism completes the stability support of the steel truss, effectively solving the bending moment and uneven force on the jacking point of the steel truss during the long-distance jacking process, and improving the construction efficiency and safety. The internal rotating seat and the internal fixed seat can not only drive the support assembly to rise and fall during the jacking process of the steel truss, but also support the support assembly when the support assembly supports the steel truss to prevent the bending moment from increasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of the construction structure of a jacking device provided in one embodiment of the present invention; Figure 2 It is a schematic diagram of the installation structure of the pushing device provided in one embodiment of the present invention; Figure 3 A schematic diagram of the installation structure of the adjustment mechanism provided in one embodiment of the present invention; Figure 4 A schematic diagram of a clamping structure of a clamping member provided in one embodiment of the present invention; Figure 5 A schematic diagram of the structure of a deflection ring provided in one embodiment of the present invention; Figure 6 It is a schematic diagram of a top view of the structure of a support assembly provided in one embodiment of the present invention; Legend: 11. First pier; 12. Main pier; 13. Second pier; 2. Moving mechanism; 21. Pushing support; 22. Moving slider; 3. Adjusting mechanism; 31. Base assembly; 311. External telescopic shell; 312. Internal fixed seat; 313. Internal rotating seat; 314. Rotating seat; 321. First gear; 322. Second gear; 323. Connecting piece; 324. Connecting groove; 331. Rotating shaft; 332. Cantilever rod; 333. Push rod; 4. Angle mechanism; 41. Fixed ring; 42. Deflection ring; 421. Zero point area; 422. Deflection area; 43. Connecting rod; 6. Steel truss; 7. River channel. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] like Figure 1-Figure 6 As shown, a steel truss main beam pushing device comprises a moving mechanism 2, an adjusting mechanism 3, an angle mechanism 4, a first pier 11 arranged at one side of a river channel 7, and a second pier 13 arranged at the other side of the river channel 7, wherein a plurality of moving mechanisms 2 are installed on the piers; the moving mechanism 2 abuts against the steel truss 6 from the bottom and pushes the steel truss 6 from the first pier 11 across the river channel 7 to the second pier 13; the moving mechanism 2 is directly installed on the first pier 11 and the second pier 13, and generates thrust by mechanical or hydraulic means, abuts against the steel truss 6 from the bottom, and gradually pushes the steel truss 6 from the first pier 11 (starting point) to the second pier 13 (end point) smoothly along a preset pushing direction; The first buttress 11 includes a main buttress 12 and a plurality of supporting buttresses, the plurality of supporting buttresses and the main buttress 12 are sequentially arranged along the jacking direction, and the main buttress 12 is adjacent to the second buttress 13; In view of the inconvenience of setting up temporary supports in the existing steel truss beam 6 jacking construction, the steel truss beam 6 is prone to bending moments and uneven force on the jacking point during the long-distance jacking process, there are two first piers 11, which are symmetrically arranged at the bottom of the steel truss beam 6. The adjusting mechanism 3 is arranged between the symmetrically arranged main piers 12 and connected to the moving mechanism 2. The adjusting mechanism 3 changes with the height of the moving mechanism 2 and adjusts the supporting force of the cantilever section of the steel truss beam 6. Since the steel truss beam 6 needs to be jacked from the main pier 12 to the second pier 13, the moving mechanism 2 needs to repeatedly lift and move the steel truss beam 6 to complete the jacking of the steel truss beam 6. In order to keep adjusting the bending moment of the steel truss beam 6 during the jacking process, the adjusting mechanism 3 can change with the height of the moving mechanism 2 and support the steel truss beam 6 from the bottom of the steel truss beam 6 in time when the steel truss beam 6 has bending moments and inclinations, so as to avoid further expansion of the bending moments and inclinations of the steel truss beam 6 and affect the jacking construction of the steel truss beam 6. The angle mechanism 4 is arranged on the adjusting mechanism 3, which is used to detect the angle of the steel truss beam 6. The bending moment of the beam 6. When the steel truss beam 6 is not stable during the pushing process and a downward bending moment occurs, the adjusting mechanism 3 is affected by the gravity of the steel truss beam 6 and rotates. In order to avoid further increase in the bending moment of the steel truss beam 6, the adjusting mechanism 3 needs to rotate at the bottom of the steel truss beam 6, and the rotation direction is opposite to the direction of the bending moment, thereby offsetting the bending moment of the steel truss beam 6. After the adjusting mechanism 3 rotates, an angle deviation will occur from the initial state, and the angle mechanism 4 can detect the angle deviation. The angle deviation at this time is the bending moment of the steel truss beam 6. Therefore, it is necessary to drive the adjusting mechanism 3 to rotate in the opposite direction of the bending moment of the steel truss beam 6 through the angle deviation detected by the angle mechanism 4 until the angle deviation is reduced and the initial state is restored. At this time, the adjusting mechanism 3 completes the stability support for the steel truss beam 6. In summary, through the coordinated work of the moving mechanism 2, the adjusting mechanism 3 and the angle mechanism 4, the bending moment of the steel truss beam 6 and the uneven force on the pushing point during long-distance pushing are effectively solved, thereby improving the construction efficiency and safety.

[0020] In one embodiment, the adjusting mechanism 3 includes a base assembly 31, a gear assembly and a support assembly. The base assembly 31 is installed on the main pier 12. The support assembly is detachably connected to the mobile mechanism 2. The support assembly is rotatably connected to the mobile mechanism 2. The support assembly is connected to the base assembly 31 through a gear assembly to limit the telescopic movement of the base assembly 31. Since the adjusting mechanism 3 needs to support the steel truss 6 as the height of the mobile mechanism 2 changes, so as to ensure that the steel truss 6 is supported in time when a bending moment occurs in the steel truss 6, the base assembly 31 is fixed to the main pier 12 as a force point, and is also connected to the mobile mechanism 2, and can change with the height change of the mobile mechanism 2. The support assembly is used to support the steel truss 6 and can change with the bottom. The seat assembly 31 changes with the height change, that is, the support assembly can be consistent with the movement trend of the steel truss 6 and change with the height change of the steel truss 6. When the steel truss 6 has a bending moment, the support assembly supports the steel truss 6 by rotating. Therefore, in order to enable the base assembly 31 to rise and fall in height, when the support assembly supports the steel truss 6, it can also maintain the current height to increase the supporting force of the support assembly. Therefore, when the support assembly rotates to support the steel truss 6, the rotation action is transmitted to the base assembly 31 through the gear assembly, so that the base changes from a telescopic state to a supporting state, so that when the support assembly rotates to support the steel truss 6, the base assembly 31 can also change from a telescopic state to a supporting state.

[0021] In one embodiment, the base assembly 31 includes an outer telescopic shell 311, an inner fixed seat 312 and an inner rotating seat 313; the inner fixed seat 312 is fixedly arranged on the main pier 12, the inner rotating seat 313 is rotatably sleeved on the inner fixed seat 312, and the top of the inner rotating seat 313 is rotatably connected to the outer telescopic shell 311, a rotating seat 314 is arranged on the top of the outer telescopic shell 311, the moving mechanism 2 is rotatably connected to the rotating seat 314, the support assembly is rotatably connected to the outer telescopic shell 311, and the inner rotating seat 313 and the inner fixed seat 312 are both located in the outer telescopic shell 311; a rotating seat 314 is arranged on the top of the outer telescopic shell 311, and the rotating seat 314 is rotatably connected to the moving mechanism 2, so as to ensure that the support assembly can move with the moving mechanism 2 during the pushing process. 2 moves, the outer telescopic shell 311 itself has a telescopic function, and through the connection with the mobile mechanism 2, the height of the outer telescopic shell 311 is raised and lowered, and the inner rotating seat 313 and the inner fixed seat 312 are driven to move up and down during the lifting, so that the support component can change with the height change of the mobile mechanism 2, and maintain a protective distance from the steel truss 6, so that when the steel truss 6 has a bending moment, it can timely sense and prevent the bending moment of the steel truss 6; the rotation connection between the support component and the outer telescopic shell 311 and the rotation function of the inner rotating seat 313 enable the adjustment mechanism 3 to maintain stable support for the steel truss 6 during the jacking process, and even in a complex jacking construction environment, the safety and stability of the steel truss 6 can be ensured.

[0022] In one embodiment, the gear assembly includes a first gear 321 and a second gear 322, the first gear 321 is arranged on the support assembly, and the second gear 322 is fixedly arranged on the top of the inner rotating seat 313, the first gear 321 and the second gear 322 are meshed, and drive the inner rotating seat 313 and the inner fixed seat 312 to rotate; the inner rotating seat 313 is provided with a clamping piece 323, and the clamping piece 323 is slidably arranged on the rotating seat 314, and a clamping groove 324 is provided on a side of the inner fixed seat 312 that contacts the inner rotating seat 313, and the clamping piece 323 is limitedly clamped with the clamping groove 324, so as to change the vertical movement state of the inner rotating seat 313 and the inner fixed seat 312; In the initial linear movement state, the inner rotating seat 313 and the inner fixed seat 312 are not limitedly connected, and driven by the outer telescopic shell 311 and the moving mechanism 2, the inner rotating seat 313 and the inner fixed seat 312 move up and down linearly to meet the height change of the steel truss 6 during the jacking process; Rotational support state: once the cantilever section of the steel truss beam 6 is too long, bending moment or tilt 6 will be promptly applied to the support assembly. At this time, the support assembly will be subjected to the gravity of the steel truss beam 6, and the driving assembly will drive the support assembly to rotate the steel truss beam 6 upward to reduce the cantilever section and tilt of the steel truss beam 6. When the support assembly rotates, the first gear 321 will also rotate. Since the first gear 321 is meshed with the second gear 322, the second gear 322 rotates accordingly. The second gear 322 is fixedly arranged on the top of the inner rotating seat 313, so the inner The rotating seat 313 as a whole will rotate around the inner fixed seat 312, and the clamping piece 323 is slidably set on the rotating seat 314. After the inner rotating seat 313 rotates, it will be clamped with the clamping groove 324 on the inner fixed seat 312 to limit the up and down movement of the inner rotating seat 313 and the inner fixed seat 312. At the same time, the inner rotating seat 313 and the inner fixed seat 312 maintain the current height to support the support assembly; in short, the inner rotating seat 313 and the inner fixed seat 312 can drive the support assembly to rise and fall during the jacking process of the steel truss 6.

[0023] In one embodiment, the support assembly includes a rotating shaft 331, two cantilever rods 332 and a top rod 333; the rotating shaft 331 is rotatably connected to the outer telescopic shell 311, the two cantilever rods 332 are connected to both ends of the top rod 333, and the other ends of the two cantilever rods 332 are fixedly connected to the rotating shaft 331; it also includes a driving assembly, the driving assembly is used to drive the rotating shaft 331 to rotate, the top rod 333 is located on the side of the steel truss 6 close to the second pier 13, and supports the steel truss 6 from the bottom of the steel truss 6 upward; the two cantilever rods 332 are respectively connected to both ends of the top rod 333, and the other end is fixedly connected to the rotating shaft 331, the cantilever rod 332 can move with the rotation of the rotating shaft 331, and then adjust the position and angle of the top rod 333, the top rod 333 is located on the steel truss 6 On the side close to the second pier 13, its main function is to provide supporting force from the bottom of the steel truss 6 upward. The length and position of the top rod 333 can be adjusted as needed to adapt to the steel truss 6 with different inclination angles. The driving component can provide sufficient torque to overcome the resistance encountered by the supporting component during rotation, ensuring that the supporting component can work stably and reliably, such as motors, hydraulic motors, etc.; when the top rod 333 moves to a suitable position, its bottom contacts the bottom of the steel truss 6 and begins to provide upward supporting force from below. The size of the supporting force can be achieved by adjusting the output power of the driving component or adjusting the length of the top rod 333. Under the action of the supporting force, the tilting tendency of the steel truss 6 is alleviated or eliminated, ensuring stability and safety during the construction process.

[0024] In one embodiment, the angle mechanism 4 includes a fixed ring 41, a deflection ring 42, a connecting rod 43 and an angle control plate; the fixed ring 41 is fixedly arranged on the rotating seat 314, the deflection ring 42 is fixedly installed on the rotating shaft 331, one end of the connecting rod 43 is fixedly installed on the deflection ring 42, and a zero point area 421 and a deflection area 422 are provided on a side of the fixed ring 41 in contact with the connecting rod 43, and the other end of the connecting rod 43 slides between the zero point area 421 and the deflection area 422, and the zero point area 421 and the deflection area 422 are both provided with metal sheets, and the connecting rod 43 is made of metal material, and is used to connect the deflection area 422 and the angle control plate to form a closed loop, and is used to detect the deflection angle of the deflection ring 42 and the fixed ring 41; The fixed ring 41 is fixedly mounted on the rotating seat 314 as a reference point; the deflection ring 42 is fixedly mounted on the rotating shaft 331 and rotates with the rotation of the rotating shaft 331. One end of the connecting rod 43 is fixedly mounted on the deflection ring 42, and the other end slides in a specific area of ​​the fixed ring 41. The fixed ring 41 is provided with a zero point area 421 and a deflection area 422, which respectively correspond to different angle detection states. The zero point area 421 represents the initial position or the reference position, and the deflection area 422 is used to detect the deflection angle of the deflection ring 42 relative to the fixed ring 41. Metal sheets are provided in the zero point area 421 and the deflection area 422, and the connecting rod 43 itself is made of metal. When the connecting rod 43 slides between the zero point area 421 and the deflection area 422, it will contact or approach the metal sheets in different areas to a degree sufficient to form a closed loop. The control board is connected to these metal sheets through the circuit. When the connecting rod 43 slides to the deflection area 422 and forms a closed loop with the metal sheets in this area, the current or signal in the circuit will change. This change is captured by the angle control board and converted into angle information, thereby realizing accurate detection of the deflection angle of the deflection ring 42.

[0025] In one embodiment, it also includes a main control system, an angle control board and a driving component electrically connected to the main control system. The angle control board uploads the detected rotation data of the rotating shaft 331 to the main control system, and the main control system sends a rotation instruction to the driving component according to the deflection angle; when the steel truss 6 tilts or needs to adjust the support angle, the angle control board will detect the rotation data (i.e., the deflection angle) of the rotating shaft 331 in real time, and the main control system will send a rotation instruction to the driving component according to the deflection angle to ensure that the driving component can accurately drive the rotating shaft 331 to rotate as required. After receiving the rotation instruction, the driving component will immediately execute the corresponding action to drive the rotating shaft 331 to rotate. As the rotating shaft 331 rotates, the support angle of the supporting component will also change accordingly, thereby achieving effective support for the steel truss 6; in short, the main control system can accurately calculate and send a rotation instruction based on the angle data detected in real time, ensuring that the supporting component can be adjusted to the optimal support angle as required.

[0026] In one embodiment, the moving mechanism 2 includes a push support 21, a moving slider 22 and an oil cylinder; the push support 21 is installed on the first pier 11 and the second pier 13, the moving slider 22 is installed on the push support 21, and is used to push the steel truss, and the oil cylinder is used to drive the moving slider 22 to move; when the steel truss needs to be moved, the oil cylinder starts to work. The piston rod of the oil cylinder is connected to the moving slider 22 through a mechanical connection. When pressure is generated inside the oil cylinder, the piston rod will push the moving slider 22 to move along the guide structure of the push support 21. As the moving slider 22 moves, it will gradually approach and contact the steel truss. Under the continuous thrust of the oil cylinder, the moving slider 22 will apply a forward push force to the steel truss. When this push force is large enough, it can overcome the friction between the steel truss and the ground or other supporting structures, so that the steel truss starts to move forward. During the movement of the steel truss, the main control system can adjust the working pressure and speed of the oil cylinder as needed, thereby realizing precise control of the moving speed and position of the steel truss. By continuously adjusting the working state of the oil cylinder, it is possible to ensure that the steel truss moves along a predetermined path and speed. When the steel truss moves to a specified position, the main control system will send a stop command to the oil cylinder. After receiving the stop command, the oil cylinder will stop working and lock the position of the piston rod, thereby fixing the moving slider 22 and the steel truss. At this point, the steel truss is stably placed at the new position.

[0027] A method for constructing a steel truss beam 6 main beam comprises the following construction steps: S1: Install and debug the moving mechanism 2, the adjusting mechanism 3 and the angle mechanism 4; S2: lifting and installation of the steel truss beam 6, starting the oil cylinder to initially push the steel truss beam 6; S3: monitor the deformation, support force change and bending moment data of the steel truss 6; S301: When the cantilever section of the steel truss 6 is too long and tilts, the adjusting mechanism 3 supports the steel truss 6, and the angle adjusting mechanism 3 detects the deflection angle. The adjusting mechanism 3 rotates in the direction opposite to the bending moment direction of the steel truss 6 according to the deflection angle detected by the angle mechanism 4. To prevent the steel truss 6 from excessively tilting due to the long cantilever section, which may cause structural instability or damage, when the cantilever section of the steel truss 6 is too long and tilts, the adjusting mechanism 3 increases the supporting force on the steel truss 6 by rotating the supporting assembly to correct the tilt. The angle mechanism 4 detects the deflection angle of the steel truss 6 and provides a basis for the adjusting mechanism 3 to adjust the direction. The adjusting mechanism 3 rotates according to the principle that the deflection angle is opposite to the bending moment direction to reduce or eliminate the influence of the bending moment on the steel truss 6, and can adjust the supporting force in time to ensure the safety and stability of the steel truss 6 during the pushing process.

[0028] S4: Repeat S2-S3 until the steel truss 6 is pushed to the second pier 13.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A steel truss main beam pushing device, characterized in that: It comprises a moving mechanism, an adjusting mechanism, an angle mechanism, a first buttress arranged at the side of a river channel, and a second buttress arranged at the other side of the river channel, wherein a plurality of the moving mechanisms are installed at the first buttress and the second buttress; the moving mechanism abuts against the steel truss from the bottom and pushes the steel truss from the first buttress across the river channel to the second buttress; The first buttress comprises a main buttress and a plurality of supporting buttresses, the plurality of supporting buttresses and the main buttress are sequentially arranged along the jacking direction, and the main buttress is adjacent to the second buttress; There are two first piers, which are symmetrically arranged at the bottom of the steel truss. The adjusting mechanism is arranged between the symmetrically arranged main piers and connected to the moving mechanism. The adjusting mechanism changes with the height of the moving mechanism and adjusts the supporting force of the cantilever section of the steel truss. The angle mechanism is arranged in the adjusting mechanism to detect the bending moment of the steel truss.

2. A steel truss girder pushing device according to claim 1, characterized in that: The adjustment mechanism includes a base assembly, a gear assembly and a support assembly. The base assembly is installed on the main pier. The support assembly is detachably connected to the moving mechanism. The support assembly is rotatably connected to the moving mechanism. The support assembly is connected to the base assembly through the gear assembly to limit the telescopic movement of the base assembly.

3. A steel truss main beam pushing device according to claim 2, characterized in that: The base assembly includes an outer telescopic shell, an inner fixed seat and an inner rotating seat; the inner fixed seat is fixedly arranged on the main pier, the inner rotating seat is rotatably sleeved on the inner fixed seat and the top of the inner rotating seat is rotatably connected to the outer telescopic shell, a rotating seat is arranged on the top of the outer telescopic shell, the moving mechanism is rotatably connected to the rotating seat, the supporting assembly is rotatably connected to the outer telescopic shell, and the inner rotating seat and the inner fixed seat are both located in the outer telescopic shell.

4. A steel truss main beam pushing device according to claim 3, characterized in that: The gear assembly comprises a first gear and a second gear, the first gear is arranged on the support assembly, the second gear is fixedly arranged on the top of the inner rotating seat, the first gear and the second gear are meshed to drive the inner rotating seat and the inner fixed seat to rotate; The inner rotating seat is provided with a clamping piece, and the clamping piece is slidably arranged on the rotating seat. The side of the inner fixed seat that contacts the inner rotating seat is provided with a clamping groove. The clamping piece is limitedly clamped with the clamping groove to change the vertical movement state of the inner rotating seat and the fixed seat.

5. The steel truss main beam pushing device according to claim 4, characterized in that: The support assembly includes a rotating shaft, two cantilever rods and a top rod; the rotating shaft is rotatably connected to the outer telescopic shell, the two cantilever rods are connected to the two ends of the top rod, and the other ends of the two cantilever rods are fixedly connected to the rotating shaft; it also includes a driving assembly, the driving assembly is used to drive the rotating shaft to rotate, the top rod is located on the side of the steel truss close to the second pier, and supports the steel truss from the bottom of the steel truss upward.

6. A steel truss main beam pushing device according to claim 5, characterized in that: The angle mechanism includes a fixed ring, a deflection ring, a connecting rod and an angle control plate; the fixed ring is fixedly arranged on the rotating seat, the deflection ring is fixedly installed on the rotating shaft, one end of the connecting rod is fixedly installed on the deflection ring, a zero point area and a deflection area are arranged on a side of the fixed ring in contact with the connecting rod, the other end of the connecting rod slides between the zero point area and the deflection area, the zero point area and the deflection area are both provided with metal sheets, the connecting rod is made of metal, and is used to connect the deflection area and the angle control plate to form a closed loop, so as to detect the deflection angles of the deflection ring and the fixed ring.

7. The steel truss main beam pushing device according to claim 6, characterized in that: It also includes a main control system and an angle control board and a drive component electrically connected to the main control system. The angle control board uploads the detected rotation data of the rotating shaft to the main control system, and the main control system sends a rotation instruction to the drive component according to the angle data.

8. The steel truss main beam pushing device according to claim 1, characterized in that: The moving mechanism includes a pushing support, a moving slider and an oil cylinder; the pushing support is installed on the first pier and the second pier, the moving slider is installed on the pushing support and is used to push the steel truss, and the oil cylinder is used to drive the moving slider to move.

9. A method for constructing a steel truss main beam, applicable to the steel truss main beam jacking device according to any one of claims 1 to 8, characterized in that: The construction steps include: S1: Install and debug the moving mechanism, adjustment mechanism and angle mechanism; S2: Lifting and installation of steel trusses, starting the oil cylinder to initially push the steel trusses; S3: monitor the deformation, support force change and bending moment data of steel trusses; S301: When the cantilever section of the steel truss is too long and tilted, the adjustment mechanism supports the steel truss, and the angle adjustment mechanism detects the deflection angle. The adjustment mechanism rotates in a direction opposite to the bending moment direction of the steel truss according to the deflection angle detected by the angle mechanism; S4: Repeat S2-S3 until the steel truss is pushed to the second pier.

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