LU505836B1

LU505836B1 - Stepping-type multi-point continuous shifting device for steel box girder

Info

Publication number: LU505836B1
Application number: LU505836A
Authority: LU
Inventors: Nan Wu; Yantao Wang; Yingjie Li; Yi Liu; Baoping Tian; Wenxian Gao; Mengshan Yang; Gangjun Wang; Simeng Li; Qipeng Chen; Chong Xue; Ruihua Ren; Youjin Jiao; Yanhua Cao; Xiaodong Jiang
Original assignee: China Railway Third Bureau Group No 4 Eng Co Ltd; China Railway No 3 Eng Group
Priority date: 2023-12-18
Filing date: 2023-12-18
Publication date: 2024-06-18

Abstract

The present invention discloses a stepping-type multi-point continuous shifting device for steel box girder, comprising a steel box girder body, a guiding beam, a first pier, a connecting rod, linear measurement points, vertical partition boards, support plates, a second support column, a pushing platform, reinforcement ribs, sliding grooves, pushing blocks, settlement monitors, bearing platforms, horizontal partition boards, and side belly plates. The inner wall of the steel box girder body is fixedly connected with reinforcement ribs. The present invention employs multi-point stepping technology to perform timely correction during the assembly and shifting process of steel box girders, ensuring stability throughout the shifting process. It integrates balance control and cumulative error control, utilizing geometric and physical monitoring methods to guarantee the stability of the steel box girder during shifting, prevent overturning, ensure that the forces on the steel box girder, pushing platform, and temporary support pier do not exceed the warning range, and meet the design requirements for bridge alignment after shifting. This ensures construction safety, high shifting speed, and precision in beam placement, among other advantages.

Description

Stepping-Type Multi-Point Continuous Shifting Device for Steel Box

Girder

Technical Field

The present invention relates to the technical field of steel box girder shifting devices, specifically to a stepping-type multi-point continuous shifting device for steel box girders.

Background Technology

The stepping-type multi-point continuous shifting method utilizes multiple stepping systems synchronously to incrementally shift the steel box girder from short spans to longer spans. This cyclic operation is repeated until the steel box girder reaches the designed position. The working principle involves vertically lifting the girder using lifting cylinders, horizontally shifting it forward with pushing cylinders, and, after retracting the lifting cylinders, placing the girder on temporary piers. The jacking operation, completing one cycle of shifting, is a self-balancing process widely employed in the construction of various types of continuous and simply supported girders. However, in the construction of long-span, steeply inclined bridges, the presence of multiple temporary piers for auxiliary support and the influence of the bridge's own weight necessitate frequent adjustments to the temporary pier heights and alignment during the shifting process, resulting in labor-intensive and time- consuming operations that impact the construction schedule.

Contents of the Invention

The purpose of the present invention is to provide a stepping-type multi-point continuous shifting device for steel box girders, addressing the issues raised in the aforementioned background technology.

To achieve the above purpose, the present invention provides the following technical solution: a stepping-type multi-point continuous shifting device for steel box 7905630 girders, comprising a support plate. The upper part of the support plate is fixedly connected with a first support column, and the top of the support plate is equipped with a temporary support pier, which is fixedly connected to the top of the first support column. The top of the temporary support pier is equipped with an equipment shell, and the top of the equipment shell is fixedly connected with a guiding plate. The upper surface of the equipment shell is provided with a sliding groove, and the sliding groove accommodates a pushing block. The top of the pushing block is fixedly connected to a sliding platform, and the bottom of the sliding platform is fixedly connected with a lifting cylinder. The lifting cylinder is fixedly connected to the top of the temporary support pier, and one side of the sliding platform's outer wall is fixedly connected with a pushing cylinder. The pushing cylinder is fixedly connected to the top of the equipment shell. The other side of the sliding platform's outer wall is fixedly connected with a lateral correction jack. The top of the sliding platform is equipped with the steel box girder body, and the top of the steel box girder body is provided with linear measurement points and measurement control points.

Preferably, the first support column's outer wall on one side is fixedly connected with a crossbar, and the outer wall on one side of the crossbar is fixedly connected with a first reinforcement rod.

Preferably, the bottom of the steel box girder body is equipped with a first pier, and the top of the first pier is fixedly connected with a bearing platform. The top of the bearing platform is fixedly connected with a bridge support.

Preferably, one side of the support plate is equipped with a second pier.

Preferably, the top of the temporary support pier is fixedly connected with a second support column, and the top of the temporary support pier is equipped with a pushing platform, which is fixedly connected to the top of the second support column.

Preferably, the two side outer walls of the steel box girder body are fixedly connected with guiding beams. The two sides of the steel box girder body are equipped with connecting rods, and the connecting rods are fixedly connected to one side outer wall of the guiding beams. One side outer wall of the connecting rod is fixedly connected with a second reinforcement rod.

Preferably, the inner wall of the steel box girder body is fixedly connected with vertical partition boards and horizontal partition boards.

Preferably, the inner wall of the steel box girder body is fixedly connected with reinforcement ribs.

Preferably, one side outer wall of the steel box girder body is equipped with side belly plates.

Preferably, the top of the second pier is fixedly connected with a settlement monitor.

Compared to the existing technology, the advantageous effects of the present invention are: the invention employs multi-point stepping technology to perform timely correction during the assembly and shifting process of steel box girders, ensuring stability throughout the shifting process. It integrates balance control and cumulative error control, utilizing geometric and physical monitoring methods to guarantee the stability of the steel box girder during shifting, prevent overturning, ensure that the forces on the steel box girder, pushing platform, and temporary support pier do not exceed the warning range, and meet the design requirements for bridge alignment after shifting. This ensures construction safety, high shifting speed, and precision in beam placement, among other advantages.

Description of the Drawings 7505636

FIG.1: Overall three-dimensional structural schematic diagram of the invention.

FIG.2: Enlarged structural schematic diagram of region A in FIG.1.

FIG.3: Overall front view structural schematic diagram of the invention.

FIG.4: Enlarged structural schematic diagram of region B in FIG.3.

FIG.5: Overall side view structural schematic diagram of the invention.

FIG.6: Three-dimensional structural schematic diagram of the bridge support of the invention.

FIG.7: Three-dimensional structural schematic diagram of the equipment shell of the invention.

In the figures: 1. Steel box girder body; 2. Guiding beam; 3. First pier; 4. Bridge support; 5. Temporary support pier; 6. Equipment shell; 7. Lifting cylinder; 8. Guiding plate; 9. Sliding platform; 10. Pushing cylinder; 11. Lateral correction jack; 12. First support column; 13. Crossbar; 14. First reinforcement rod; 15. Second pier; 16.

Connecting rod; 17. Second reinforcement rod; 18. Linear measurement point; 19.

Measurement control point; 20. Vertical partition board; 21. Support plate; 22. Second support column; 23. Pushing platform; 24. Reinforcement rib; 25. Sliding groove; 26.

Pushing block; 27. Settlement monitor; 28. Bearing platform; 29. Horizontal partition board; 30. Side belly plate.

Specific Embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely in the following in conjunction with the accompanying drawings in the embodiments of the present invention, and it is clear that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative labour fall within the scope of protection of the present invention.

Referring to FIGs. 1-7, in one embodiment provided by the present invention: a stepping-type multi-point continuous shifting device for steel box girders comprises a support plate 21. The upper part of the support plate 21 is fixedly connected with a 5 first support column 12, and the top of the support plate 21 is equipped with a temporary support pier 5, which is fixedly connected to the top of the first support column 12. The top of the temporary support pier 5 is equipped with an equipment shell 6, and the top of the equipment shell 6 is fixedly connected with a guiding plate 8. The upper surface of the equipment shell 6 is provided with a sliding groove 25, and the sliding groove 25 accommodates a pushing block 26. The top of the pushing block 26 is fixedly connected to a sliding platform 9, and the bottom of the sliding platform 9 is fixedly connected with a lifting cylinder 7. The lifting cylinder 7 is fixedly connected to the top of the temporary support pier 5, and one side of the sliding platform's 9 outer wall is fixedly connected with a pushing cylinder 10. The pushing cylinder 10 is fixedly connected to the top of the equipment shell 6. The other side of the sliding platform's 9 outer wall is fixedly connected with a lateral correction jack 11. The top of the sliding platform 9 is equipped with the steel box girder body 1, and the top of the steel box girder body 1 is provided with linear measurement points 18 and measurement control points 19; one side of the first support column 12 outer wall is fixedly connected with a crossbar 13, and the outer wall on one side of the crossbar 13 is fixedly connected with a first reinforcement rod 14. The crossbar 13 and the first reinforcement rod 14 are used to reinforce the structural strength of the first support column 12; the bottom of the steel box girder body 1 is equipped with a first pier 3, and the top of the first pier 3 is fixedly connected with a bearing platform 28. The top of the bearing platform 28 is fixedly connected with a bridge support 4, which is used to support the steel box girder body 1; one side of the support plate 21 is equipped with a second pier 15; the top of the temporary support pier 5 is fixedly connected with a second support column 22, and the top of the temporary support pier 5 is equipped with a pushing platform 23, which is fixedly connected to the top of the second support column 22. The pushing platform 23 is used for temporarily supporting the steel box girder body 1 during the pushing process; the two side outer walls of the 7905630 steel box girder body 1 are fixedly connected with guiding beams 2. The two sides of the steel box girder body 1 are equipped with connecting rods 16, and the connecting rods 16 are fixedly connected to one side outer wall of the guiding beams 2. One side outer wall of the connecting rod 16 is fixedly connected with a second reinforcement rod 17. The connecting rod 16 and the second reinforcement rod 17 are used to reinforce the structural strength of the guiding beams 2; the inner wall of the steel box girder body 1 is fixedly connected with vertical partition boards 20 and horizontal partition boards 29. The vertical partition boards 20 and the horizontal partition boards 29 are used to reinforce the structural strength of the steel box girder body 1; the inner wall of the steel box girder body 1 is fixedly connected with reinforcement ribs 24. The reinforcement ribs 24 are used to reinforce the structural strength of the steel box girder body 1; one side outer wall of the steel box girder body 1 is equipped with side belly plates 30. The side belly plates 30 are used to reinforce the structural strength of the steel box girder body 1; the top of the second pier 15 is fixedly connected with a settlement monitor 27. The settlement monitor 27 is used to detect settlement data.

Working Principle: When using the present invention for steel box girder shifting construction, first, arrange measurement control points 19 on the steel box girder body 1, with the measurement control points 19 on both sides of the axis serving as elevation control points. These measurement control points 19 can be used for both axis and mileage control, marked by punching and painting as indicators. During assembly, arrange the bottom frame of the steel box girder body 1 according to the manufacturing alignment. The Z value in the coordinate center of the bottom frame, which is the superimposed theoretical pre-camber value, adjusts the height of the pressure plate to achieve the theoretical elevation. Control the longitudinal alignment by aligning the X and Y coordinate points on the pressure frame for overall assembly manufacturing, controlling the planar alignment. The bridge deck cross slope is set to two percent, and during overall assembly, adjust the transverse alignment of the steel box girder body 1 according to the design alignment. Adjust the transverse alignment 7905630 by adjusting the height of the pressure plate, controlling the lateral alignment. During the pushing operation, control the linear alignment using linear measurement points 18 measured by the total station. The lifting cylinder 7 on the equipment shell 6 synchronously lifts. The pushing block 26 in the sliding groove 25 pushes, and the sliding platform 9 lifts the steel box girder body 1. Then, the pushing cylinder 10 pushes the steel box girder body 1 forward. After the pushing is completed, the lifting cylinder 7 descends, and the steel box girder body 1 lands on the pushing platform 23. The pushing cylinder 10 retracts to start the next pushing operation. After each pushing operation, the offset of the measurement control points 19 at the front end of the steel box girder body 1 relative to the bridge alignment center is measured using the total station. If the offset exceeds thirty millimeters, timely correction is required using the lateral correction jack 11 to ensure planar alignment during the pushing process.

After each pushing operation, with the transverse centerline of the first segment of the steel box girder body 1 as the reference, re-adjust the coordinate points for layout.

Adjust the alignment with each pushing operation. In the adjustment process, the relative coordinate values of the planar alignment remain unchanged. During the pushing process, promptly correct the pushing-out steel box girder body 1 and easily meet the design alignment after pushing. After the pushing is in place, the lateral adjustment also easily meets the design alignment. Measure the deflection and calculate the midpoint of the next step to determine whether to use the deviation correction device for lateral movement. At the same time, observe the displacement of each temporary support pier 5 during measurement to compare with the design value for longitudinal alignment control. For each section of the steel box girder installed, measure the deflection and compare it with the calculated value to judge the quality of the manufacturing and installation of the steel box girder body 1 and determine the longitudinal slope. Ensure that when the steel box girder body 1 reaches the front support point, there is enough net height between the bottom of the beam and the bridge support 4 on the bearing platform 28 of the first pier 3 for arranging the jacking equipment, control longitudinal alignment. During the lateral movement of the steel box girder, measure the stress using stress gauges installed at the bottom 7905630 of the steel box girder body 1, and compare it with the design specified value to monitor the pushing force during the pushing process. Arrange deflection monitoring points on the section of the steel box girder body 1 and use a level to measure the deflection of the steel box girder body 1 and the guiding beams 2 during pushing.

Throughout the pushing process, conduct balance detection and control, and install inclination sensors on each temporary support pier 5 to detect the tilt angles of the box girder in the X and Y directions. Set the maximum tilt angle of each inclination sensor in the X and Y directions to control the balance of the steel box girder body 1.

If any inclination sensor exceeds the set value in the X and Y directions, the system stops and alarms. During the lateral movement of the steel box girder body 1, the main control panel calculates the total displacement of each force point and uses the difference between the maximum and minimum displacements to obtain the cumulative error. If the cumulative error exceeds the requirement, the system stops the "automatic" mode and enters the "manual" mode to independently adjust the action of a certain side cylinder to correct the error. During the pushing construction, the temporary support piers 5 are subjected to large forces. Due to dynamic construction and friction generated during pushing, the temporary support piers 5 not only experience axial forces but also bending moments due to the friction during pushing. The magnitude of this force is difficult to determine, so it is necessary to monitor the longitudinal displacement of the temporary support pier 5. Use a total station for measurement and install prisms or reflective sheets on the top of the temporary support pier 5 for actual measurement. Observe the frequency of measurement at each temporary support pier 5 before and after pushing and every three meters during pushing. When changing the jacking or supporting point of the steel box girder body 1, or when there is a significant change in the pushing force, increase the monitoring frequency of the settlement and displacement of the temporary support pier 5. Use the settlement monitor 27 on the top of the second pier 15 to monitor settlement. The guiding plate 8 is used for pushing guidance, the first support column 12 and the support plate 21 are used to support the temporary support pier 5, the crossbar 13 and the first reinforcement rod 14 are used to reinforce 7905630 the structural strength of the first support column 12, the connecting rod 16 and the second reinforcement rod 17 are used to reinforce the structural strength of the guiding beams 2, the vertical partition boards 20, reinforcement ribs 24, horizontal partition boards 29, and side belly plates 30 are used to reinforce the structural strength of the steel box girder body 1, and the second support column 22 is used to support the pushing platform 23.

For those skilled in the art, it is apparent that the details of the exemplary embodiments are not limited to the above description. Furthermore, without departing from the spirit or essential features of the present invention, other specific forms can be realized by those skilled in the art. Therefore, regardless of which perspective it is viewed from, the embodiments should be considered as illustrative and non-limiting. The scope of the present invention is limited by the appended claims and not by the foregoing description, and is therefore intended to encompass all variations falling within the meaning and scope of the equivalent elements of the claims. Any appended markings in the claims should not be regarded as limiting the claims to which they relate.

Claims

1. A stepping-type multi-point continuous shifting device for steel box girder, comprising a support plate (21), characterized in that: the upper top of the support plate (21) is fixedly connected with a first support column (12), and the top of the support plate (21) is provided with a temporary support pier (5), and the temporary support pier (5) is fixedly connected to the top of the first support column (12), and the top of the temporary support pier (5) is provided with an equipment shell (6), and the top of the equipment shell (6) is fixedly connected with a guiding plate (8). The upper surface of the equipment shell (6) is provided with a sliding groove (25), and the sliding groove (25) is provided with a pushing block (26). The top of the pushing block (26) is fixedly connected with a sliding platform (9), and the bottom of the sliding platform (9) is fixedly connected with a lifting cylinder (7). The lifting cylinder (7) is fixedly connected to the top of the temporary support pier (5), and one side of the outer wall of the sliding platform (9) is fixedly connected with a pushing cylinder (10). The pushing cylinder (10) is fixedly connected to the top of the equipment shell (6), and the other side of the outer wall of the sliding platform (9) is fixedly connected with a lateral correction jack (11). The top of the sliding platform (9) is provided with a steel box girder body (1), and the top of the steel box girder body (1) is provided with linear measurement points (18) and two measurement control points (19) in the front and rear.

2. A stepping-type multi-point continuous shifting device for steel box girder according to claim 1, characterized in that: one side of the outer wall of the first support column (12) is fixedly connected with a crossbar (13), and one side of the outer wall of the crossbar (13) is fixedly connected with a first reinforcement rod (14).

3. A stepping-type multi-point continuous shifting device for steel box girder according to claim 1, characterized in that: the bottom of the steel box girder body (1) is provided with a first pier (3), and the top of the first pier (3) is fixedly connected with a bearing platform (28). The top of the bearing platform (28) is fixedly connected with 7905630 a bridge support (4).

4. A stepping-type multi-point continuous shifting device for steel box girder according to claim 1, characterized in that: one side of the support plate (21) is provided with a second pier (15).

5. À stepping-type multi-point continuous shifting device for steel box girder according to claim 1, characterized in that: the top of the temporary support pier (5) is fixedly connected with a second support column (22), and the top of the temporary support pier (5) is provided with a pushing platform (23). The pushing platform (23) is fixedly connected to the top of the second support column (22).

6. À stepping-type multi-point continuous shifting device for steel box girder according to claim 3, characterized in that: both sides of the outer wall of the steel box girder body (1) are fixedly connected with guiding beams (2), and both sides of the steel box girder body (1) are provided with connecting rods (16). The connecting rods (16) are fixedly connected to one side of the outer wall of the guiding beam (2), and one side of the outer wall of the connecting rod (16) is fixedly connected with a second reinforcement rod (17).

7. A stepping-type multi-point continuous shifting device for steel box girder according to claim 3, characterized in that: the inner wall of the steel box girder body (1) is fixedly connected with vertical partition boards (20) and horizontal partition boards (29).

8. A stepping-type multi-point continuous shifting device for steel box girder according to claim 3, characterized in that: the inner wall of the steel box girder body (1) is fixedly connected with reinforcement ribs (24).

9. A stepping-type multi-point continuous shifting device for steel box girder 7905630 according to claim 3, characterized in that: one side of the outer wall of the steel box girder body (1) is provided with side belly plates (30).

10. A stepping-type multi-point continuous shifting device for steel box girder according to claim 4, characterized in that: the top of the second pier (15) is fixedly connected with a settlement monitor (27).