All-weather steel box girder suspended splicing precise matching positioning method

Abstract

The invention discloses an all-weather steel box girder suspended splicing precise matching and positioning method which comprises the following steps: S1, when a steel girder is processed, calculating to obtain the real displacement of a finished bridge and setting the pre-camber, namely manufacturing the pre-camber; s2, during in-plant long-line method matching prefabrication, matching parts between abutted seams are arranged, positioning is conducted according to the matching parts during field splicing, preliminary positioning of steel beams is achieved, and coarse matching of beam sections is conducted; s3, according to the position of an existing steel beam and the relative position relation between beam sections between manufacturing line types, the precise elevation of the steel beam is calculated, and beam section precise matching is conducted; step S4, performing calculation according to the real-time measurement data at the precise matching moment, performing calculation of the assembly elevation in time, performing adjustment and locking of the elevation, and performing remeasurement and correction in time; and S5, after adjustment is completed, a horse plate is welded, and the relative position of the structure is fixed. Precise matching construction of the steel box girder under the condition that the environment changes severely in the daytime is achieved, and the construction period is greatly shortened.

Description

Technical Field

[0001] The invention relates to an all-weather steel box girder cantilever assembly precise matching and positioning method. Background Art

[0002] The cantilever assembly of steel beams constructed using welding technology is controlled based on the tangent assembly principle, that is, after the steel beam is hoisted into place, it is roughly matched through matching parts to basically restore its linear shape when it was manufactured. Then, through measurement, calculation and analysis, the end elevation of the beam is adjusted to achieve precise matching and complete the accurate positioning of the steel beam.

[0003] However, since the temperature, sunshine and other factors have a great influence on the main beam line shape, the traditional construction control method for steel beam assembly is generally to measure the temperature during the night time period and perform precise matching construction, which results in low construction efficiency.

[0004] Therefore, an all-weather steel box girder cantilever assembly precision matching positioning method is provided. Summary of the invention

[0005] The purpose of the present invention is to overcome the existing defects and provide an all-weather steel box girder suspension precise matching positioning method, which realizes the precise matching construction of steel box girders under the conditions of drastic environmental changes during the day, greatly saving construction time.

[0006] The technical solution to achieve the above purpose is:

[0007] An all-weather steel box girder suspension assembly precision matching positioning method, comprising:

[0008] Step S1, when processing the steel beam, the actual displacement of the completed bridge is calculated to set the pre-camber, that is, to manufacture the pre-camber;

[0009] Step S2, setting matching parts between the joints during the long-line matching prefabrication in the factory, positioning according to the matching parts during on-site assembly, achieving preliminary positioning of the steel beam, and performing rough matching of the beam segments;

[0010] Step S3, calculating the precise elevation of the steel beam according to the existing steel beam position and the relative position relationship between the beam segments between the manufacturing line types, and performing precise matching of the beam segments;

[0011] Step S4, at the precise matching moment, the real-time measurement data is used for calculation, the assembly elevation is calculated in time, and the elevation is adjusted and locked, and remeasurement and correction are performed in time;

[0012] Step S5, after the adjustment is completed, weld the horse plate to fix the relative position of the structure;

[0013] Step S6, after welding is completed, the elevation is re-measured and the error is corrected, and the steps S3 to S5 are repeated to adjust the steel box girder until it meets the steel box girder precision matching construction standards, thereby completing the steel box girder cantilever assembly.

[0014] Preferably, in step S1, the manufacturing pre-camber = - the real displacement of the structure, that is, the real displacement of the structure in the last working condition is calculated by assembling according to the tangent method.

[0015] Preferably, in step S3, the manufacturing line type can be calculated using finite element software, where the manufacturing line type = the design line type + the manufacturing pre-camber, and the design line type is designed by construction personnel.

[0016] Preferably, in step S3, the installed segments are measured before precise matching, and the exact position of the segments to be installed is calculated according to the relative position of the manufacturing line type;

[0017] Assume that the lengths of the beam segments of the installed segments are L1 and L2, and the length of the beam segment of the segment to be installed is L3;

[0018] In the manufacturing line type, the elevations of the beam segments L1 and L2 of the installed segments are y1 and y2 respectively, and the elevation of the beam segment L3 of the segment to be installed is y3;

[0019] During on-site splicing, the elevations of the beam segments L1 and L2 of the installed segments are y'1, y'2 and, respectively, and the elevation of the beam segment L3 of the segment to be installed is y'3;

[0020] Then, based on geometric knowledge, the elevation y'3 of the beam segment L3 of the on-site assembled segment can be calculated from the manufacturing line shape:

[0021]

[0022] y′3=y′1+L 12 sin(θ3+θ2-θ1);

[0023]

[0024] Where θ1 is the angle between the beam segment L1 of the installed segment in the manufacturing line and the horizontal plane, θ2 is the angle between the beam segment L1 of the installed segment in the on-site splicing and the horizontal plane, θ3 is the angle between the connecting line of the head end of the beam segment L1 and the tail end of the beam segment L2 of the installed segment in the manufacturing line and the horizontal plane, α is the angle between the beam segments L1 and L2 of the installed segment,

[0025] Since α→180°, cosα→-1, then L 12 ≈L1+L2, that is:

[0026] y′3=y′1+(L1+L2)sin(θ3+θ2-θ1).

[0027] Preferably, the error in step S4 includes: process error and sequential splicing error;

[0028] Process error:

[0029] After the precise matching is completed, the elevations y1, y2 and y3 of the beam segments L1, L2 and L3 before welding are theoretically consistent with the elevations y'1, y'2 and y'3 of the beam segments L1, L2 and L3 after welding. However, due to the error caused by the welding deformation construction process, their spatial posture changes. The calculation formula for the process error is:

[0030] Δy=y′3-[y′1+L 12 sin(θ3+θ2-θ1)];

[0031] Spelling error:

[0032] The sequential assembly error is the deviation between the segment elevation and the manufacturing line shape when assembled according to the tangent method. Only the errors of adjacent segment steel beams are considered. According to the measurement, the errors of the installed beam segments L1 and L2 are Δx1 and Δx2 respectively. The error Δx3 of the beam segment L3 to be installed is:

[0033]

[0034] Then, based on the Δy obtained from the process error and the Δx3 obtained from the sequential assembly error, the elevation is adjusted and locked, and remeasurement and correction are carried out in a timely manner.

[0035] The beneficial effects of the present invention are as follows: the theoretical spatial relative position of the steel beam is fixed, and is affected by the environment. Although the measured elevation of the steel beam is constantly changing, as long as the real-time measurement data is used for calculation at the time of precise matching, the assembly elevation is calculated immediately, the elevation is adjusted and locked, and re-measurement and correction are carried out in time, thereby achieving the purpose of precise matching construction of steel box beams at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of an all-weather steel box girder cantilever assembly precision matching positioning method of the present invention;

[0037] Figure 2 This is a schematic diagram of the installation of the linear center beam section manufactured in the present invention;

[0038] Figure 3 is a schematic diagram of a beam segment for manufacturing a linear installed segment in the present invention;

[0039] Figure 4 It is a schematic diagram of a beam section of an installed segment assembled on site in the present invention;

[0040] Figure 5 It is a schematic diagram of beam segment installation caused by sequential splicing errors in the present invention. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] The process flow of suspended assembly of steel box girders of cable-stayed bridges includes steel beam lifting, rough matching, fine matching, welding and other processes.

[0044] (1) Lifting of steel beams

[0045] a) Use two steel strand jacks on the bridge crane to lower the two bridge deck shoulder beams to the upper part of the steel box girder segment, with the error not exceeding ±1m from the specified position, so as to release the steel strand jacks.

[0046] b) Use wire rope sling to connect the crane lifting beam and the steel box beam lifting lug.

[0047] Use a hydraulic pump to adjust the position of the shoulder beam slide to just above the theoretical center of gravity of the predetermined bridge deck segment.

[0048] c) Lock the shoulder beam slide plate with a threaded rod system.

[0049] d) Use the two longitudinal adjustment cylinders on the lifting system to push the jack frame to the predetermined position, turn on the jack, and lift the steel beam into place.

[0050] (2) Rough matching of beam segments

[0051] a) When the beam section is hoisted to the vicinity of the bridge deck, use the horizontal jack on the hoisting device to adjust the longitudinal slope of the hoisted steel box beam to be consistent with the longitudinal slope of the installed beam section, so that the gap width of the upper and lower interfaces at the corresponding position of the installed beam section is roughly equal. Continue to lift the beam section and adjust the elevation to make it roughly flush with the surface of the installed beam section.

[0052] b) Use the longitudinal adjustment jack at the front end of the bridge crane to drive the steel box girder to move longitudinally, so that the beam section slowly moves closer to the installed beam section. Then, use the transverse adjustment jack at the front end of the bridge crane to adjust the transverse position of the steel box girder so that the axis of the hoisted beam section is aligned with the axis of the installed beam section.

[0053] c) Repeatedly make fine adjustments to align the top stop plate of the hoisted beam section with the longitudinal partition of the installed beam section.

[0054] d) Weld the cross limit plate on the top stop plate to limit the displacement of adjacent beam sections, and connect the matching parts at the longitudinal partition of the beam section with bolts to lock the main hoisting jack. At this point, the rough matching of the beam section is completed.

[0055] (3) Precision matching of beam segments

[0056] According to the control elevation in the monitoring command, the hydraulic jack of the bridge crane is started to fine-tune the steel beam elevation to reach the command elevation; at the same time, the jack is used to correct the deviation of the steel beam axis.

[0057] After the above adjustments are completed, weld the horse plate to fix the relative position of the structure.

[0058] The present invention realizes elevation pre-control by calculating according to the geometric control method of manufacturing line type in the rough matching and fine matching stages of beam segments, and then completes the cantilever assembly of steel box beams.

[0059] like Figure 1 As shown, an all-weather steel box girder suspension assembly precise matching positioning method comprises:

[0060] Step S1, when processing the steel beam, the actual displacement of the completed bridge is calculated to set the pre-camber, that is, to manufacture the pre-camber.

[0061] In the embodiment, manufacturing pre-camber = - actual displacement of the structure, that is, the actual displacement of the structure in the last working condition calculated by assembling according to the tangent method.

[0062] Step S2, setting matching parts between joints during long-line matching prefabrication in the factory, positioning according to the matching parts during on-site assembly, achieving preliminary positioning of the steel beam, and performing rough matching of the beam segments.

[0063] Step S3, according to the existing steel beam position and the relative position relationship between the beam segments between the manufacturing line types, the precise elevation of the steel beam is calculated to perform precise matching of the beam segments.

[0064] In the embodiment, the manufacturing line type can be calculated according to the finite element software, and the manufacturing line type = the design line type + the manufacturing pre-camber, and the design line type is designed by the construction personnel.

[0065] In the embodiment, the installed segments are measured before the precise matching, and the exact position of the segments to be installed is calculated based on the relative position of the manufacturing line type;

[0066] like Figure 2-4 As shown, it is assumed that the lengths of the beam segments of the installed segments are L1 and L2 respectively, and the length of the beam segment of the segment to be installed is L3;

[0067] In the manufacturing line type, the elevations of the beam segments L1 and L2 of the installed segments are y1 and y2 respectively, and the elevation of the beam segment L3 of the segment to be installed is y3;

[0068] During on-site splicing, the elevations of the beam segments L1 and L2 of the installed segments are y'1, y'2 and, respectively, and the elevation of the beam segment L3 of the segment to be installed is y'3;

[0069] Then, based on geometric knowledge, the elevation y'3 of the beam segment L3 of the on-site assembled segment can be calculated from the manufacturing line shape:

[0070]

[0071] y′3=y′1+L 12 sin(θ3+θ2-θ1);

[0072]

[0073] Where θ1 is the angle between the beam segment L1 of the installed segment in the manufacturing line and the horizontal plane, θ2 is the angle between the beam segment L1 of the installed segment in the on-site splicing and the horizontal plane, θ3 is the angle between the connecting line of the head end of the beam segment L1 and the tail end of the beam segment L2 of the installed segment in the manufacturing line and the horizontal plane, α is the angle between the beam segments L1 and L2 of the installed segment,

[0074] Since α→180°, cosα→-1, then L 12 ≈L1+L2, that is:

[0075] y′3=y′1+(L1+L2)sin(θ3+θ2-θ1).

[0076] Step S4, at the precise matching moment, the real-time measurement data is used for calculation, the assembly elevation is calculated in time, and the elevation is adjusted and locked, and remeasurement and correction are performed in time.

[0077] In the embodiment, the error in step S4 includes: process error and sequential splicing error;

[0078] Process error:

[0079] After the precise matching is completed, the elevations y1, y2 and y3 of the beam segments L1, L2 and L3 before welding are theoretically consistent with the elevations y'1, y'2 and y'3 of the beam segments L1, L2 and L3 after welding. However, due to the error caused by the welding deformation construction process, their spatial posture changes. The calculation formula for the process error is:

[0080] Δy=y′3-[y′1+L 12 sin(θ3+θ2-θ1)];

[0081] Spelling error:

[0082] The sequential assembly error is the deviation between the segment elevation and the manufacturing line shape when assembled according to the tangent method. It only considers the error of the adjacent segment steel beams. The assembled beam segment has been stressed and its line shape has deviated from the manufacturing line shape, so it cannot be used as a basis for judgment. Figure 5 As shown, according to the measurement, the errors of the installed beam sections L1 and L2 are Δx1 and Δx2 respectively, and the error Δx3 of the beam section L3 to be installed is:

[0083]

[0084] Then, based on the Δy obtained from the process error and the Δx3 obtained from the sequential assembly error, the elevation is adjusted and locked, and remeasurement and correction are carried out in a timely manner.

[0085] In the embodiment, the error should also take into account the cross-sectional deformation. When measuring the elevation of the section, the section will deform laterally because the structure is under stress, which should be taken into account when evaluating the structural line shape. For example, when the steel box girder of a cable-stayed bridge is hoisted, the elevation of the hoisting point will be slightly higher. After the cable is tensioned, the elevation of the top surface of the steel beam at the anchor point of the cable is slightly higher. The lateral deformation of the section should be calculated before construction and measured during construction to adjust the elevation, and some data with large deviations should be eliminated.

[0086] Step S5, after the adjustment is completed, the horse plate is welded to fix the relative position of the structure.

[0087] Step S6, after welding is completed, the elevation is re-measured and the error is corrected, and steps S3-S5 are repeated to adjust the steel box girder until it meets the steel box girder precision matching construction standards, thereby completing the steel box girder cantilever assembly.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An all-weather steel box girder suspension assembly precision matching positioning method, characterized in that: include: Step S1, when processing the steel beam, the actual displacement of the completed bridge is calculated to set the pre-camber, that is, to manufacture the pre-camber; Step S2, setting matching parts between the joints during the long-line matching prefabrication in the factory, positioning according to the matching parts during on-site assembly, achieving preliminary positioning of the steel beam, and performing rough matching of the beam segments; Step S3, calculating the precise elevation of the steel beam according to the existing steel beam position and the relative position relationship between the beam segments between the manufacturing line types, and performing precise matching of the beam segments; Step S4, at the precise matching moment, the real-time measurement data is used for calculation, the assembly elevation is calculated in time, and the elevation is adjusted and locked, and re-measurement and error correction are performed in time; Step S5, after the adjustment is completed, weld the horse plate to fix the relative position of the structure; Step S6, after welding is completed, the elevation is re-measured and the error is corrected, and the steps S3 to S5 are repeated to adjust the steel box girder until it meets the steel box girder precision matching construction standards, thereby completing the steel box girder cantilever assembly.

2. The all-weather steel box girder suspension assembly precision matching positioning method according to claim 1 is characterized in that: In the step S1, the manufacturing pre-camber = - the real displacement of the structure, that is, the real displacement of the structure in the last working condition is calculated by assembling according to the tangent method.

3. The all-weather steel box girder suspension assembly precision matching positioning method according to claim 1 is characterized in that: In step S3, the manufacturing line type can be calculated using finite element software. The manufacturing line type = the design line type + the manufacturing pre-camber. The design line type is designed by the construction personnel.

4. The all-weather steel box girder suspension assembly precision matching positioning method according to claim 1 is characterized in that: In step S3, the installed segments are measured before precise matching, and the exact position of the segments to be installed is calculated based on the relative position of the manufacturing line type; Assume that the lengths of the beam segments of the installed segments are L1 and L2, and the length of the beam segment of the segment to be installed is L3; In the manufacturing line type, the elevations of the beam segments L1 and L2 of the installed segments are y1 and y2 respectively, and the elevation of the beam segment L3 of the segment to be installed is y3; During on-site splicing, the elevations of the beam segments L1 and L2 of the installed segments are y'1, y'2 and, respectively, and the elevation of the beam segment L3 of the segment to be installed is y'3; Then, based on geometric knowledge, the elevation y'3 of the beam segment L3 of the on-site assembled segment can be calculated from the manufacturing line shape: y′3=y′1+L 12 sin(θ3+θ2-θ1); Where θ1 is the angle between the beam segment L1 of the installed segment in the manufacturing line and the horizontal plane, θ2 is the angle between the beam segment L1 of the installed segment in the on-site splicing and the horizontal plane, θ3 is the angle between the connecting line of the head end of the beam segment L1 and the tail end of the beam segment L2 of the installed segment in the manufacturing line and the horizontal plane, α is the angle between the beam segments L1 and L2 of the installed segment, Since α→180°, cosα→-1, then L 12 ≈L1+L2, that is: y′3=y′1+(L1+L2)sin(θ3+θ2-θ1).

5. The all-weather steel box girder suspension assembly precision matching positioning method according to claim 4 is characterized in that: The error in step S4 includes: process error and sequential splicing error; Process error: After the precise matching is completed, the elevations y1, y2 and y3 of the beam segments L1, L2 and L3 before welding are theoretically consistent with the elevations y'1, y'2 and y'3 of the beam segments L1, L2 and L3 after welding. However, due to the error caused by the welding deformation construction process, their spatial posture changes. The calculation formula for the process error is: Δy=y′3-[y′1+L 12 sin(θ3+θ2-θ1)]; Spelling error: The sequential assembly error is the deviation between the segment elevation and the manufacturing line shape when assembled according to the tangent method. Only the errors of adjacent segment steel beams are considered. According to the measurement, the errors of the installed beam segments L1 and L2 are Δx1 and Δx2 respectively. The error Δx3 of the beam segment L3 to be installed is: Then, based on the Δy obtained from the process error and the Δx3 obtained from the sequential assembly error, the elevation is adjusted and locked, and remeasurement and correction are carried out in a timely manner.

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