A method for controlling the angle error of the steel box tie arch rib anchor pipe

Abstract

The present invention relates to a method for controlling the angle error of the anchor pipe of the steel box tie arch rib. The present invention comprises the following steps: segmenting the arch ribs of the entire bridge according to the arch rib hanging point positions of the steel box tie arch bridge; erecting an arch rib assembly frame, and setting a plurality of support plates on the surface of the frame; laying out a curved line ground sample on the ground below the frame according to the arch rib curve manufacturing line type; assembling the arch rib segments by the long line method; turning the line through the theodolite to reverse the center position line of the ground sample anchor pipe to the top of the top plate unit and the bottom plate unit; welding the welds of the web plate on the other side of the arch rib segment and the partition plate, the top plate, and the bottom plate, and adjusting the anchor pipe angle to be consistent with the center position line of the ground sample anchor pipe; setting an auxiliary template with a cross line at the end of the anchor pipe to locate the angle and position of the anchor pipe; welding the connecting welds of the anchor pipe and the arch rib segment to complete the production of the entire arch rib segment. The present invention ensures that the angle between the anchor pipe angle and the horizontal plane along the bridge direction and the angle between the transverse bridge direction and the arch axis line meet the design requirements.

Description

Technical Field

[0001] The invention relates to the technical field of bridge manufacturing, in particular to a method for controlling the angle error of a steel box tie rod arch rib anchor pipe. Background Art

[0002] The main bridge of this project is a single-span bottom-supported steel box tie arch bridge with a span of 170 meters and a total width of 24.1 meters. The entire bridge arch is equipped with two arch ribs, which are fully welded steel box girder structures with two arch ribs. The center span of the arch rib is 167.2m, the elevation rise is 41.8m, and the arch axis line type is a quadratic parabola. The arch rib has a rectangular cross-section, is 2.2m high and 1.8m wide, and the diaphragm is perpendicular to the arch axis. The diaphragm is set at the suspender, and the anchor pipe is inserted into the top plate of the arch rib and welded to the suspension point diaphragm. The angle between the anchor pipe and the arch axis changes with the change of the position of the arch rib segment. If there is an error in the accuracy control of the anchor pipe angle during the production process, it will affect the installation quality of the sling, resulting in friction between the sling and the anchor pipe and reducing the service life of the anchor cable.

[0003] The angle of the arch rib anchor pipe is a three-dimensional angle in space. It is necessary to ensure that the entire arch rib anchor pipe is on the same horizontal plane and that the angle between the anchor pipe and the arch axis reaches the designed value. After the bridge is completed, the anchor pipe of this project not only plays a role in guiding the slings, but also serves as the key stress-bearing part of the bridge. The arch rib box is equipped with a hanging point reinforcement partition at the anchor pipe position. The anchor pipe and the hanging point partition are fully penetrated and welded, and the welding deformation is difficult to control. At the same time, the arch rib structure is complex, the box section size is large, and a single arch rib is designed with 1 to 3 hanging points. Therefore, precise control of the arch rib anchor pipe angle is a key technology in the entire manufacturing process. Summary of the invention

[0004] To this end, the present invention provides a method for controlling the angle error of the steel box tie arch rib anchor pipe, which is used to control the anchor pipe angle to ensure that the angle between the anchor pipe angle and the horizontal plane along the bridge direction and the angle between the anchor pipe angle and the arch axis in the transverse direction of the bridge meet the design requirements.

[0005] In order to solve the above technical problems, the present invention provides a method for controlling the angle error of the steel box tie rod arch rib anchor pipe, comprising the following steps:

[0006] S1: According to the arch rib hanging point position of the steel box tied arch bridge, the arch rib of the whole bridge is divided into segments, and a single arch rib is divided into several arch rib segments, so that a single arch rib segment contains only one set of anchor pipes;

[0007] S2: erecting an arch rib assembly frame, setting a number of support plates on the surface of the frame, and arranging the support plates at the top and bottom plates on both sides of the arch rib and directly below the arch rib axis and at the position where there are partitions;

[0008] S3: According to the arch rib curve manufacturing line type, the curved line ground sample is laid out on the ground below the tire frame, so that the ground sample line is consistent with the longitudinal baseline of the arch rib segment in the longitudinal direction, and the ground sample line is consistent with the transverse baseline of the arch rib segment in the transverse direction. The curved line ground sample line is used as the reference line for the positioning of the arch rib plate unit, and the horizontal and vertical baselines of the curved line ground sample are used as the reference to lay out the anchor pipe angle and center position ground sample line;

[0009] S4: The arch rib segments are assembled by the long-line method. The outer web unit with a curved line is used as the reference. The longitudinal baseline of the outer web unit is accurately aligned with the longitudinal ground sample line by the horizontal assembly method. The outer web unit is fixedly connected to the frame. The angle position line of the anchor diaphragm is marked on the outer web unit. The anchor diaphragm unit is aligned and assembled. The top plate unit and the bottom plate unit are assembled in sequence with the anchor diaphragm unit inside the frame as the positioning. The other welds in the box except the anchor diaphragm unit are welded.

[0010] S5: Use the theodolite to rotate the center line of the ground sample anchor pipe to the top plate unit and the bottom plate unit, re-measure the position of the assembled anchor diaphragm unit, use heat correction to correct the deformation, weld the weld inside the anchor diaphragm box, and then assemble the web unit on the other side, re-measure the longitudinal baseline of the arch rib segment, the transverse baseline of the arch rib segment and the external structural dimensions;

[0011] S6: Weld the welds between the web and the diaphragm, top plate and bottom plate on the other side of the arch rib segment. After welding, use heat correction to correct welding deformation. Insert the anchor pipe through the anchor hole of the bottom plate unit. Use the theodolite and the plumb line device to adjust the anchor pipe angle to be consistent with the center position line of the ground sample anchor pipe.

[0012] S7: An auxiliary sample with a crosshair is set at the end of the anchor pipe, and the auxiliary sample is placed in the anchor pipe of each arch rib so that the surface of the auxiliary sample is flush with the anchor pipe. The relative coordinates of the center point of the anchor pipe and the longitudinal and transverse baselines of the arch rib segment are measured by a total station according to the crosshairs of the auxiliary sample to locate the angle and position of the anchor pipe;

[0013] S8: Weld the connecting welds between the anchor pipe and the arch rib segment to complete the production of the entire arch rib segment.

[0014] In one embodiment of the present invention, in step S1, the length of the arch rib segment is 4 to 8 meters.

[0015] In one embodiment of the present invention, in step S2, the tire frame is a grid-type rigid structure composed of cross beams and longitudinal beams, and the vertical bearing capacity is more than twice the weight of the arch rib segment.

[0016] In one embodiment of the present invention, in step S2, if there is no longitudinal and transverse beam support within 1.5 meters from the arch rib box opening, steel piers are arranged at the ring opening to ensure the size of the box opening.

[0017] In one embodiment of the present invention, in step S3, the method for setting out the curved line ground sample on the ground below the tire frame is: using paint marking and steel needle marking to set out the arch rib curved line ground sample on the ground below the tire frame.

[0018] In one embodiment of the present invention, in step S5, the outer web unit is in close contact with the tire frame.

[0019] In one embodiment of the present invention, in step S6, the inner diameter of the anchor hole of the bottom plate unit is 2-4 mm larger than the outer diameter of the anchor pipe.

[0020] In one embodiment of the present invention, the thermal correction temperature in step S5 and step S6 is controlled at 600-800°C.

[0021] In one embodiment of the present invention, in step S7, the auxiliary template is a circular steel plate with a thickness ranging from 16 to 20 mm, and the auxiliary template is 0.5 to 1 mm smaller than the inner diameter of the anchor pipe.

[0022] In one embodiment of the present invention, in step S7, the diameter of the auxiliary template is 0.5-1 mm smaller than the inner diameter of the anchor pipe.

[0023] The above technical solution of the present invention has the following advantages compared with the prior art:

[0024] (1) The present invention adopts the 7+1 long-line method for continuous matching and production, and the arch rib production and arch rib pre-assembly are completed simultaneously, which can ensure that the arch rib linearity meets the design requirements, while reducing the pre-assembly work, shortening each round of manufacturing cycle by 10 to 15 days, and reducing production costs.

[0025] (2) The present invention uses three-dimensional software to lay out the anchor pipe position, takes the horizontal and vertical baselines of the ground sample as the reference, lays out the anchor pipe angle and the center position ground sample line, sets a measurement reference point at the end of the tire frame, and simultaneously lays out a curved line ground sample on the ground below the tire frame, so as to effectively control the arch rib production line type and the anchor pipe angle.

[0026] (3) The anchor pipe of the present invention adopts a post-installation construction process. The deformation of the arch rib segment is first trimmed and then the anchor pipe is assembled. After welding, only the deformation of the anchor pipe needs to be fine-tuned to prevent the secondary displacement of the anchor pipe space due to the large-scale correction of the arch rib deformation, thereby ensuring the dimensional accuracy of the anchor pipe space (the deviation of each angle is not more than 1.5 mm).

[0027] (4) The method of the present invention for determining the center position of the anchor pipe by using a cross-line auxiliary template is convenient to measure and feasible to operate, and can effectively and accurately control the longitudinal and lateral relative positions of the center of the anchor pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0029] Figure 1 This is the arch rib segment division diagram.

[0030] Figure 2 It is a schematic diagram of the arch rib assembly frame.

[0031] Figure 3 This is a schematic diagram of the arch rib ground sample line.

[0032] Figure 4 It is a schematic diagram of the assembly of the outer web unit and the anchor diaphragm unit.

[0033] Figure 5 It is a schematic diagram of the assembly of the outer web unit with the anchor diaphragm unit, the top plate unit and the bottom plate unit.

[0034] Figure 6 This is a schematic diagram of the arch rib assembly.

[0035] Figure 7 It is an auxiliary sample diagram.

[0036] Explanation of the reference numerals in the drawings in the specification: 1. Arch rib segment; 2. Hanger; 3. Tire frame; 4. Support plate; 5. Longitudinal baseline of arch rib segment; 6. Horizontal baseline of arch rib segment; 7. Suspension point partition position line; 8. Center position of anchor point; 9. Outer web unit; 10. Anchor partition unit; 11. Top plate unit; 12. Bottom plate unit; 13. Inner web unit; 14. Anchor pipe; 15. Auxiliary template; 16. Cross line; 17. Steel pier. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0038] A method for controlling the angle error of a steel box tie rod arch rib anchor pipe of the present invention comprises the following steps:

[0039] S1: According to the arch rib hanging point position of the steel box tied arch bridge (the connection position between the arch rib and the hanger 2), the arch rib of the whole bridge is segmented, and a single arch rib is divided into a plurality of arch rib segments 1, so that a single arch rib segment 1 contains only one group of anchor pipes 14; it is convenient to use the ring welding gap of the arch rib segment 1 to fine-tune the angle of the anchor pipe 14; Figure 1 shown.

[0040] S2: Erect the arch rib assembly frame 3, and set a number of support plates 4 on the surface of the frame 3. The support plates 4 are arranged at the top and bottom plates on both sides of the arch rib and directly below the arch rib axis and at the position where there are partitions, such as Figure 2 As shown;

[0041] S3: Using 3D software, according to the arch rib curve, a curved line sample line is laid out on the ground below the tire frame 3, so that the curved line sample line is consistent with the longitudinal baseline 5 of the arch rib segment in the longitudinal direction, and the curved line sample line is consistent with the transverse baseline 6 of the arch rib segment in the transverse direction, such as Figure 3 As shown, the curved line ground sample line is used as the reference line for positioning the arch rib plate unit, and the horizontal and vertical baselines of the curved line ground sample line are used as the reference to lay out the anchor pipe angle (i.e. the line connecting the hanging point partition position line 7 and the center position 8 of the anchor point) and the center position ground sample line (i.e. the center position 8 of the anchor point); the above method effectively controls the arch rib production line type and the anchor pipe angle.

[0042] S4: The long-line method "7+1" is used to assemble the arch rib segments. The outer web unit 9 with a curved line is used as a reference. The horizontal assembly method is used to accurately align the longitudinal baseline of the outer web unit 9 with the longitudinal ground sample line, and the outer web unit 9 is fixedly connected to the tire frame 3. The angle position line of the anchor diaphragm unit 10 is marked on the outer web unit 9, and the anchor diaphragm unit 10 is aligned and assembled. The top plate unit 11 and the bottom plate unit 12 are assembled in sequence with the anchor diaphragm unit 10 inside the stand as the positioning, and the other welds in the box except the anchor diaphragm unit 10 are welded; by adopting the 7+1 long-line method for continuous matching and production, the arch rib production and arch rib pre-assembly are completed simultaneously, which can ensure that the arch rib linearity meets the design requirements, while reducing the pre-assembly work, shortening each round of manufacturing cycle by 10 to 15 days, and reducing the production cost. Figure 4-Figure 6 shown.

[0043] S5: Use the theodolite to rotate the center position line of the ground sample anchor pipe to the top plate unit 11 and the bottom plate unit 12, re-measure the position of the assembled anchor diaphragm unit 10, use heat correction to correct the deformation, weld the weld between the anchor diaphragm unit 10 and the box body, and then assemble the inner web unit 13 on the other side, re-measure the position of the arch rib segment longitudinal baseline 5, the arch rib segment transverse baseline 6 and the external structure size;

[0044] S6: Weld the welds of the inner web unit 13 on the other side of the arch rib segment 1 and the anchor partition unit 10, the top plate unit 11, and the bottom plate unit 12. After welding, use heat correction to correct the welding deformation, insert the anchor pipe 14 through the anchor hole of the bottom plate unit 12, and adjust the angle of the anchor pipe 14 to be consistent with the center position line of the ground sample anchor pipe 14 through the theodolite and the plumb line device; the anchor pipe of the present invention is a post-installation construction process, first the deformation of the arch rib segment is corrected in place, and then the anchor pipe 14 is assembled. After welding, only the deformation of the anchor pipe 14 needs to be fine-tuned to prevent the secondary displacement of the anchor pipe 14 space due to the large-scale correction of the arch rib deformation, so as to ensure the spatial dimensional accuracy of the anchor pipe 14 (the deviation of each angle is not more than 1.5mm).

[0045] S7: An auxiliary template 15 with a crosshair 16 is provided at the end of the anchor pipe 14, such as Figure 7 As shown, the auxiliary template 15 is placed in the anchor tube 14 of each arch rib, so that the surface of the auxiliary sample is flush with the anchor tube 14, and the relative coordinates of the center point of the anchor tube 14 and the longitudinal and transverse baselines of the arch rib segment 1 are measured by a total station according to the crosshairs 16 of the auxiliary template 15 to locate the angle and position of the anchor tube 14; the center position of the anchor tube 14 is determined by the auxiliary template 15 with the crosshairs 16, which is convenient to measure and feasible to operate, and can effectively and accurately control the longitudinal and transverse relative positions of the center of the anchor tube 14.

[0046] S8: Welding the connecting weld between the anchor pipe 14 and the arch rib segment 1 to complete the production of the entire arch rib segment 1, and finally making the various angle errors of the anchor pipe 14 within 1.5°.

[0047] Specifically, in step S1, the length of the arch rib segment 1 is 4 to 8 meters.

[0048] Specifically, in step S2, the tire frame 3 is a grid-type rigid structure composed of transverse beams and longitudinal beams, the vertical bearing capacity is more than twice the weight of the arch rib segment 1, and the size (length, width and height) of the support plate 4 is 12×150×200 mm.

[0049] Specifically, in step S2, if there is no longitudinal and transverse beam support within 1.5 meters from the arch rib box opening, a steel buttress 17 is arranged at the ring opening position to ensure the box opening size.

[0050] Specifically, in step S3, the method for setting out the curved line ground sample on the ground below the tire frame 3 is: setting out the arch rib curved line ground sample on the ground below the tire frame 3 by using paint marking and steel needle marking.

[0051] Specifically, in step S5 , the outer web unit 9 is in close contact with the tire frame 3 .

[0052] Specifically, in step S6 , the inner diameter of the anchor hole of the bottom plate unit 12 is 2-4 mm larger than the outer diameter of the anchor pipe 14 .

[0053] Specifically, the thermal correction temperature in step S5 and step S6 is controlled at 600-800°C.

[0054] Specifically, in step S7, the auxiliary template 15 is a circular steel plate with a thickness ranging from 16 to 20 mm, and the auxiliary template 15 is 0.5 to 1 mm smaller than the inner diameter of the anchor pipe 14.

[0055] Specifically, in step S7 , the diameter of the auxiliary template 15 is 0.5-1 mm smaller than the inner diameter of the anchor pipe 14 .

[0056] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe, characterized in that: The steps include: S1: According to the arch rib hanging point position of the steel box tied arch bridge, the arch rib of the whole bridge is divided into segments, and a single arch rib is divided into several arch rib segments, so that a single arch rib segment contains only one set of anchor pipes; S2: erecting an arch rib assembly frame, setting a number of support plates on the surface of the frame, and arranging the support plates at the top and bottom plates on both sides of the arch rib and directly below the arch rib axis and at the position where there are partitions; S3: According to the manufacturing line of the arch rib curve, a curved line ground sample line is laid out on the ground below the tire frame, so that the curved line ground sample line is consistent with the longitudinal baseline of the arch rib segment in the longitudinal direction and the curved line ground sample line is consistent with the transverse baseline of the arch rib segment in the transverse direction. The curved line ground sample line is used as the reference line for positioning the arch rib plate unit, and the horizontal and longitudinal baselines of the curved line ground sample line are used as the reference to lay out the anchor pipe angle and center position ground sample lines; S4: The arch rib segments are assembled by the long-line method. The outer web unit with a curved line is used as the reference. The longitudinal baseline of the outer web unit is accurately aligned with the longitudinal ground sample line by the horizontal assembly method. The outer web unit is fixedly connected to the frame. The angle position line of the anchor diaphragm unit is marked on the outer web unit. The anchor diaphragm unit is aligned and assembled. The top plate unit and the bottom plate unit are assembled in sequence with the anchor diaphragm unit as the positioning. The welds in the other box bodies except the anchor diaphragm unit are welded. S5: Use the theodolite to rotate the center line of the ground sample anchor pipe to the top plate unit and the bottom plate unit, re-measure the position of the assembled anchor diaphragm unit, use heat correction to correct the deformation, weld the weld between the anchor diaphragm unit and the box body, and then assemble the inner web unit on the other side, re-measure the longitudinal baseline of the arch rib segment, the transverse baseline of the arch rib segment and the external structural dimensions; S6: Weld the welds of the inner web unit on the other side of the arch rib segment and the anchor diaphragm unit, top plate unit, and bottom plate unit. After welding, use heat correction to correct welding deformation, insert the anchor pipe through the anchor hole of the bottom plate unit, and adjust the anchor pipe angle to be consistent with the center position line of the ground sample anchor pipe through the theodolite and the plumb line device; S7: An auxiliary template with a crosshair is set at the end of the anchor pipe, and the auxiliary template is placed in the anchor pipe of each arch rib so that the surface of the auxiliary template is flush with the anchor pipe. The relative coordinates of the center point of the anchor pipe and the longitudinal and transverse baselines of the arch rib segment are measured by a total station according to the crosshairs of the auxiliary template to locate the angle and position of the anchor pipe; S8: Weld the connecting weld between the anchor pipe and the arch rib segment to complete the production of the entire arch rib segment.

2. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S1, the length of the arch rib segment is 4 to 8 meters.

3. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S2, the tire frame is a grid-type rigid structure composed of cross beams and longitudinal beams, and the vertical bearing capacity is more than twice the weight of the arch rib segment.

4. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S2, if there is no longitudinal and transverse beam support within 1.5 meters from the arch rib box opening, steel piers are arranged at the ring opening position to ensure the box opening size.

5. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S3, the method for setting out the curved line ground sample on the ground below the tire frame is: using paint marking and steel needle marking to set out the arch rib curved line ground sample on the ground below the tire frame.

6. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S5, the outer web unit is in close contact with the tire frame.

7. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S6, the inner diameter of the anchor hole of the bottom plate unit is 2-4 mm larger than the outer diameter of the anchor pipe.

8. The method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: The thermal correction temperature in step S5 and step S6 is controlled at 600-800°C.

9. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S7, the auxiliary template is a circular steel plate with a thickness ranging from 16 to 20 mm, and the diameter of the auxiliary template is 0.5 to 1 mm smaller than the inner diameter of the anchor pipe.

10. A method for controlling the angle error of the steel box tie rod arch rib anchor pipe according to claim 1, characterized in that: In step S7, the diameter of the auxiliary template is 0.5-1 mm smaller than the inner diameter of the anchor pipe.

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