Method for controlling line shape of steel box girder for scattered splicing construction

Abstract

The invention discloses a control method for the line shape of a steel box girder for scattered splicing construction. The control method comprises the steps that monitoring points are arranged on a steel box girder section of each construction batch; modeling and calculating a theoretical deformation value of the steel box girder section of the first construction batch; calculating a theoretical to-be-assembled coordinate of the steel box girder section of the first construction batch; s4, the steel box girder sections of the first construction batch are spliced; fitting and converting the actually measured coordinates of the assembled steel box girder sections of the first construction batch; the first construction batch of steel box girder sections are pushed in place; collecting actual measurement coordinates of the first construction batch of steel box girder section after the steel box girder section is pushed in place; modeling and calculating theoretical deformation values of steel box girder sections of subsequent construction batches; calculating the error of the spliced line shape; theoretical to-be-assembled coordinates of steel box girder sections of subsequent construction batches are calculated; splicing the steel box girder sections of subsequent construction batches; fitting and converting the actually measured coordinates of the spliced steel box girder sections in subsequent construction batches; and the steel box girder sections of the follow-up construction batches are pushed in place. According to the invention, the line shape of the steel box girder can be controlled with higher precision.

Description

Technical Field

[0001] The invention relates to a method for controlling the linear shape of a steel box beam used in loose assembly construction. Background Art

[0002] Loose assembly construction involves disassembling, splitting, segmenting, batching, and grouping steel components, and then assembling them into a complete structure through hoisting, installation, and connection. This method is suitable for large-scale steel structure projects, as its decentralized installation reduces installation difficulty and risk, while improving installation efficiency. For loosely assembled steel box girders, the accuracy of stress-free linear shape control is a key indicator of bridge quality. Numerous scholars have conducted research on how to achieve high-precision stress-free linear shape for steel box girders. The commonly used "phase transformation method" and "transfer rectangle method" are clear and concise, and have been widely used to correct the stress-free linear shape of steel box girders. However, they also have limitations. These two existing methods primarily focus on controlling the linear shape of the vertical curves of steel box girders. They do not consider the linear shape deviation and correction issues in the horizontal and cross-slope directions during loose assembly of steel box girders, nor do they consider linear shape fitting correction during the transverse multi-segment loose assembly process. In the correction process, they also fail to account for errors caused by factors such as welding deformation of the steel box girder. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a method for controlling the linear shape of steel box girders used for loose assembly construction, which comprehensively considers the influencing factors of the longitudinal, transverse and vertical deviations of the beam section and the deformation of the steel box girder, and can control the linear shape of the steel box girder with higher precision.

[0004] The object of the present invention is achieved by: a method for controlling the linear shape of a steel box girder for bulk construction, characterized in that the control method comprises the following steps:

[0005] S1, assuming that the total construction batch of steel box girders is a, linear monitoring points are arranged on the steel box girder section of each construction batch;

[0006] S2, modeling on bridge design software, calculating and analyzing the theoretical deformation values ​​of the first batch of steel box girder segments under the influence of various factors;

[0007] S3, combining the theoretical coordinates and the theoretical deformation values ​​of the first batch of steel box girder segments obtained by modeling analysis to calculate the theoretical coordinates to be assembled of the first batch of steel box girder segments;

[0008] S4, assembling the first construction batch of steel box girder segments according to the theoretical coordinates to be assembled of the first construction batch of steel box girder segments;

[0009] S5, fitting and converting the measured coordinates of the assembled steel box girder segments of the first construction batch;

[0010] S6, pushing the first batch of steel box girder segments into place;

[0011] S7, collecting the measured coordinates of the first batch of steel box girder segments after jacking into place;

[0012] S8, modeling on bridge design software, calculating and analyzing the theoretical deformation values ​​of the second construction batch of steel box girder segments under the influence of various factors;

[0013] S9, fitting the measured coordinates of the first batch of steel box girder segments after jacking into place, and calculating the alignment error;

[0014] S10, calculating the theoretical coordinates to be assembled of the second batch of steel box girder segments by combining the theoretical coordinates and the theoretical deformation values ​​of the second batch of steel box girder segments obtained by modeling analysis;

[0015] S11, assembling the second construction batch of steel box girder segments according to the theoretical coordinates to be assembled of the second construction batch of steel box girder segments;

[0016] S12, fitting and converting the measured coordinates of the assembled steel box girder segments of the second construction batch;

[0017] S13, pushing the second batch of steel box girder segments into place;

[0018] S14, collecting the measured coordinates of the second construction batch of steel box girder segments after jacking into place;

[0019] S15, fitting the measured coordinates of the second batch of steel box girder segments after jacking into place, and calculating the alignment error;

[0020] S16, repeating steps S7 to S15, sequentially performing assembly and jacking construction of the third construction batch of steel box girder segments to the a-1th construction batch of steel box girder segments;

[0021] S17, repeating steps S7 to S13 to perform assembly and jacking construction of the steel box girder segments of the ath construction batch;

[0022] S18, beam dropping is completed.

[0023] In the above-mentioned method for controlling the linear shape of steel box girders for loose assembly construction, when performing step S1, three monitoring sections are set longitudinally on each segment of the steel box girder segments of each construction batch, respectively located at the front end, middle part and rear end of each segment, and three monitoring points are arranged on each monitoring section, respectively located at the center axis position of each segment, the center line position of the left web plate and the center line position of the right web plate;

[0024] The number of segments of the steel box girder segment in construction batch a is B a , then the numbers of each section of the steel box girder section of the a construction batch are b a, the monitoring section of each segment is numbered c, i.e. c = 3b a -2, 3b a -1,3b a , the numbers of the three monitoring points on the monitoring section c are m 1,c,L , m 1,c , m 1,c,R ; The bth steel box girder section of the ath construction batch a The nine monitoring points on the segment are numbered as follows:

[0025]

[0026] Subscript a is the construction batch; subscript ba is the segment number of the ath construction batch; subscript L is the monitoring point on the centerline of the web on the left side of the monitoring section; subscript R is the monitoring point on the centerline of the web on the right side of the monitoring section.

[0027] In the above-mentioned method for controlling the linear shape of steel box girders for bulk construction, when performing step S3, it is assumed that the first batch of steel box girders has B1 segments, and the segments are numbered 1 to b1, the monitoring sections of each segment are numbered 1 to 3b1, and the monitoring points are numbered m. 1,c,L , m 1,c , m 1,c,R , c=3b1-2,3b1-1,3b1;

[0028] The theoretical coordinates to be assembled are calculated from the reference coordinates using the theoretical stress-free linear shape. The calculation formulas are shown in the following equations (1) and (2):

[0029]

[0030] In the above formula (1) and formula (2):

[0031] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0032] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0033] The superscript w0 is the theoretical coordinate of the steel box girder segment after assembly of a certain construction batch;

[0034] Subscript c is the number of the monitoring section of each segment;

[0035] The subscript L is the monitoring point on the web centerline on the left side of the monitoring section;

[0036] The subscript R is the monitoring point on the web centerline on the right side of the monitoring section;

[0037] is the theoretical deformation value of the first batch of steel box girder segments from the state to be assembled to the state after assembly; d 1，c，L, d 1，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the first construction batch of steel box girder segments;

[0038] μ 1，c is the angle between the center axis of the steel box girder segment of the first construction batch and the Y axis on the XY plane;

[0039] is the transverse slope angle of the first construction batch of steel box girder segments at the monitoring section c,

[0040] In the above-mentioned method for controlling the linear shape of steel box girders for loose assembly construction, when performing step S5, after the assembly of the first batch of steel box girder segments is completed and before starting to push, each monitoring point on each section of the first batch of steel box girder segments is measured, and the measured elevation value of each monitoring section is set to: The measured coordinate values ​​of the transverse direction of the bridge are: c=3b1-2, 3b1-1, 3b1, and then fit the measured coordinate values ​​of the three monitoring points of each monitoring section after assembly, see the following formula (3):

[0041]

[0042] The coordinates of the assembled steel box girder segments of the first construction batch are transformed to the location of the reference coordinates through translation and rotation, and are fitted and corrected with the theoretical stress-free linear shape; the translation value and rotation angle are calculated using the following formula (4):

[0043]

[0044] In the above formulas (3) and (4),

[0045] It is the elevation correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly;

[0046] The measured elevation values ​​of each monitoring section of the first construction batch of steel box girder sections;

[0047] The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly;

[0048] The measured coordinate values ​​of each monitoring section in the transverse direction of the bridge for the first construction batch of steel box girder segments;

[0049] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0050] The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch;

[0051] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0052] The coordinate values ​​of the assembled steel box girder segments of the first construction batch after conversion to the reference position are further calculated and shown in the following formula (5):

[0053]

[0054] In the above formula (5), y 1，c y is the mileage coordinate of the central axis monitoring point of each monitoring section on each segment of the first construction batch of steel box girder segments; 1，1 It is the mileage coordinate of the central axis monitoring point of the first monitoring section on each segment of the first construction batch of steel box girder segments; the superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinate of the reference position; the superscript w is the measured coordinate after the assembly of the steel box girder segments of a certain construction batch; the superscript T is the coordinate value of the assembled steel box girder segments of a certain construction batch when it is converted to the reference position.

[0055] In the above-mentioned method for controlling the linear shape of steel box girders for loose assembly construction, when step S9 is performed, the first batch of steel box girder segments have completed jacking and are ready for assembly of the second batch of steel box girder segments;

[0056] Assume that the last section of the first construction batch of steel box girder segments is numbered b1, the monitoring sections c are numbered 3b1-2, 3b1-1, 3b1, and the measured elevation values ​​are: The measured coordinate values ​​of the transverse direction of the bridge are: Fit the measured coordinate values ​​of the three monitoring points of each monitoring section of the last section of the first construction batch of steel box girder segments after assembly to obtain the elevation correction values ​​of the central axis monitoring points of each monitoring section after assembly. and lateral coordinate correction value See the following formula (6):

[0057]

[0058] Combined with the coordinate values ​​of the first batch of steel box girder segments after assembly, the coordinates are converted to the reference position The conversion translation distance and rotation angle are calculated based on the measured coordinate values ​​after the staged jacking is completed, which are used to calculate the coordinates of the steel box girder segments to be assembled in the second construction batch; the center axis monitoring point m at the last monitoring section of the steel box girder segments in the first construction batch is used as the coordinates of the steel box girder segments to be assembled in the second construction batch; 1,3b1 As the center of the circle, the following formula (7) is used to calculate the conversion parameters of the translation distance of the coordinates to be assembled for the second construction batch of steel box girder segments:

[0059]

[0060] The following formula (8) is used to calculate the conversion parameters of the coordinate rotation angle of the steel box girder segments to be assembled in the second construction batch:

[0061]

[0062] The error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first batch of steel box girder segments is calculated using the following formula (9):

[0063]

[0064] In the above formulas (6), (7), (8) and (9):

[0065] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0066] The superscript D is the measured coordinate of the steel box girder section after the jacking of a certain construction batch is completed;

[0067] Subscripts 3b1-2, 3b1-1, and 3b1 are monitoring section numbers;

[0068] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0069] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0070] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0071] Subscript c is the number of the monitoring section;

[0072] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0073] y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments;

[0074] When performing step S10, the error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first construction batch steel box girder segment is corrected for each segment of the second construction batch steel box girder segment. The correction value of each segment of the second construction batch steel box girder segment is calculated by setting the correction coefficient, and the coordinates to be assembled of each segment of the second construction batch steel box girder segment are obtained, as shown in the following formula (10) and the following formula (11):

[0075]

[0076] In the above formula (10) and formula (11):

[0077] y 2，c is the mileage coordinate of the central axis monitoring point of each monitoring section on each segment of the second construction batch steel box girder section;

[0078] is the mileage coordinate of the central axis monitoring point of the last monitoring section on the last segment of the first construction batch steel box girder section;

[0079] the superscript 0 is the linear shape in the theoretical stress-free state, i.e. the corresponding coordinate of the reference position;

[0080] the superscript p is the positioning coordinate of the second construction batch steel box girder section hoisted to the position to be assembled;

[0081] the subscripts c and 3b1 are the monitoring section numbers;

[0082] the subscript L is a monitoring point located on the left side of the monitoring section;

[0083] the subscript R is a monitoring point located on the right side of the monitoring section;

[0084] d 2，c，L ,d 2，c，R are the horizontal offsets of the left side web monitoring point and the right side web monitoring point from the central axis monitoring point on the same monitoring section of the second construction batch steel box girder section, respectively;

[0085] Δμ, Δω, Δθ are the rotation angles of the second construction batch steel box girder section in the XY plane, the YZ plane and the XZ plane, respectively;

[0086] α 2，c ,β 2，c ,γ 2，c are the correction coefficients of the errors after the first construction batch steel box girder section is assembled;

[0087]

[0088] 6. The control method for the linear shape of a steel box girder for scattered assembly construction according to claim 1, wherein when step S12 is performed, after the second construction batch steel box girder section is assembled, before the jacking is started, the monitoring points on each segment of the second construction batch steel box girder section are measured first, and then the measured coordinate values of the three monitoring points after the assembly of each monitoring section are fitted, as shown in the following formula (12):

[0089]

[0090] is the elevation correction value of the central axis monitoring point of each monitoring section of the second construction batch steel box girder section after assembly.

[0091] The measured elevation values ​​of each monitoring section of the second construction batch of steel box girder sections;

[0092] The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the second construction batch of steel box girder segments after assembly;

[0093] These are the measured coordinate values ​​of the transverse direction of the bridge for each monitoring section of the second construction batch of steel box girder segments.

[0094] Combined with the measured coordinate values ​​of the first construction batch of steel box girder segments after assembly and the measured coordinate values ​​of the second construction batch of steel box girder segments after assembly and the coordinate conversion values ​​of the last section of the first construction batch of steel box girder segments after assembly, calculate the conversion parameters when the coordinates of the second construction batch of steel box girder segments after assembly are converted to the reference position; take the center axis monitoring point m at the last monitoring section of the first construction batch of steel box girder segments as the reference position; 1,3b1 As the center of the circle, the conversion parameter of the translation distance of the assembled coordinates of the second construction batch of steel box girder segments is obtained, as shown in the following formula (13):

[0095]

[0096] The conversion parameters of the rotation angle of the assembled coordinates of the second construction batch of steel box girder segments are obtained as shown in the following formula (14):

[0097]

[0098] The coordinate values ​​of the assembled steel box girder segments of the second construction batch when they are converted to the reference position are calculated using the following formula (15):

[0099]

[0100] In the above formulas (12), (13), (14) and (15):

[0101] y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments;

[0102] y 2，c The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments;

[0103] The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the first construction batch of steel box girder segments;

[0104] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0105] The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch;

[0106] Subscript c is the monitoring section number;

[0107] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0108] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0109] Δμ, Δω, and Δθ correspond to the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane.

[0110] The characteristics of the invented method for controlling the linear shape of steel box girders for loose assembly construction are:

[0111] (1) By modeling in bridge analysis software and analyzing, calculating, and correcting factors affecting the deformation of the steel box girder, such as welding deformation, cantilever stress, and jacking over piers, the linear shape of the steel box girder can be controlled with higher precision.

[0112] (2) Considering that the steel box girder sections of each construction batch have not only vertical deformation but also transverse deformation and longitudinal deformation, the longitudinal, transverse and vertical line shapes of the steel box girders of each construction batch are fitted and analyzed and three-dimensionally positioned, which can improve the precision of the loose assembly construction of the steel box girders. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] Figure 1 It is a flow chart of the method for controlling the linear shape of a steel box girder for loose assembly construction of the present invention;

[0114] Figure 2 It is a schematic diagram of the positions of monitoring points arranged on the steel box girder section when performing step S1 of the method for controlling the linear shape of a steel box girder for loose assembly construction of the present invention. DETAILED DESCRIPTION

[0115] The present invention will be further described below with reference to the accompanying drawings.

[0116] See also Figure 1 and Figure 2 The method for controlling the linear shape of a steel box girder for bulk construction of the present invention comprises the following steps:

[0117] S1, assuming that the total construction batch of steel box girders is a, monitoring points are arranged on each segment of the steel box girder section of each construction batch; each steel box girder section of each construction batch is divided into several transverse segments, and each transverse segment is further divided into several longitudinal segments;

[0118] Three monitoring sections are set up along the longitudinal direction on each section of the steel box girder segment of each construction batch, located at the front, middle and rear end of each section respectively. Three monitoring points are arranged on each monitoring section, located at the center axis position of each section, the center line position of the left web plate and the center line position of the right web plate respectively.

[0119] The number of segments of the steel box girder segment in construction batch a is B a , then the numbers of each section of the steel box girder section of the a construction batch are b a , the monitoring section of each segment is numbered c, i.e. c = 3b a -2, 3b a -1,3b a , the numbers of the three monitoring points on the monitoring section c are m 1,c,L , m 1,c , m 1,c,R ; The bth steel box girder section of the ath construction batch a The nine monitoring points on the segment are numbered as follows:

[0120]

[0121] Subscript a is the construction batch; subscript ba is the segment number of the ath construction batch; subscript L is the monitoring point on the centerline of the web on the left side of the monitoring section; subscript R is the monitoring point on the centerline of the web on the right side of the monitoring section.

[0122] S2: Model the first batch of steel box girder segments on the bridge design software Midas CIVIL, and calculate and analyze the theoretical deformation values ​​of the first batch of steel box girder segments from the state before assembly to the state after assembly under the influence of various factors.

[0123] in:

[0124] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0125] The superscript w0 is the theoretical coordinate of the steel box girder segment after assembly of a certain construction batch;

[0126] Subscript c is the number of the monitoring section.

[0127] S3, combining the theoretical coordinates and the theoretical deformation values ​​of the first batch of steel box girder segments obtained by modeling analysis to calculate the theoretical coordinates to be assembled of the first batch of steel box girder segments;

[0128] Assume that the first batch of steel box beams has B1 segments, then the segments are numbered 1 to b1, the monitoring sections of each segment are numbered 1 to 3b1, and the monitoring points are numbered m. 1,c,L , m 1,c , m 1,c,R, c=3b1-2,3b1-1,3b1;

[0129] The theoretical coordinates to be assembled are calculated from the reference coordinates using the theoretical stress-free linear shape. The calculation formulas are shown in the following equations (1) and (2):

[0130]

[0131] In the above formula (1) and formula (2):

[0132] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0133] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0134] The superscript w0 is the theoretical coordinate of the steel box girder segment after assembly of a certain construction batch;

[0135] Subscript c is the number of the monitoring section of each segment;

[0136] The subscript L is the monitoring point on the web centerline on the left side of the monitoring section;

[0137] The subscript R is the monitoring point on the web centerline on the right side of the monitoring section;

[0138] is the theoretical deformation value of the steel box girder segment of the first construction batch from the state to be assembled to the state after assembly;

[0139] d 1，c，L , d 1，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the first construction batch of steel box girder segments;

[0140] μ 1，c，L is the angle between the center axis of the steel box girder segment of the first construction batch and the Y axis on the XY plane;

[0141] is the transverse slope angle of the first construction batch of steel box girder segments at the monitoring section c,

[0142] S4, assembling the steel box girder segments of the first construction batch according to the theoretical coordinates to be assembled of the steel box girder segments of the first construction batch; that is, first positioning and hoisting each segment of the steel box girder segments of the first construction batch onto the assembly bracket, then re-measuring the monitoring point coordinates of each segment of the steel box girder segments of the first construction batch, and then welding and assembling each segment into the steel box girder segments of the first construction batch.

[0143] S5, fitting and converting the measured coordinates of the assembled steel box girder segments of the first construction batch;

[0144] After the assembly of the first batch of steel box girder segments is completed and before starting the jacking, each monitoring point on each section of the first batch of steel box girder segments is measured. The measured elevation value of each monitoring section is set as: The measured coordinate values ​​of the transverse direction of the bridge are: c=3b1-2,3b1-1,3b1, and the measured coordinate values ​​of the three monitoring points of each monitoring section are fitted, as shown in the following formula (3):

[0145]

[0146] The coordinates of the assembled steel box girder segments of the first construction batch are transformed to the location of the reference coordinates through translation and rotation, and are fitted and corrected with the theoretical stress-free linear shape; the translation value and rotation angle are calculated using the following formula (4):

[0147]

[0148] In the above formulas (3) and (4),

[0149] It is the elevation correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly;

[0150] The measured elevation values ​​of each monitoring section of the first construction batch of steel box girder sections;

[0151] The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly;

[0152] The measured coordinate values ​​of each monitoring section in the transverse direction of the bridge for the first construction batch of steel box girder sections;

[0153] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinate of the reference position;

[0154] The superscript w is the measured coordinate of the steel box girder section after welding in a certain construction batch;

[0155] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0156] The coordinate values ​​of the assembled steel box girder segments of the first construction batch after conversion to the reference position are further calculated and shown in the following formula (5):

[0157]

[0158] In the above formula (5), y 1，cy is the mileage coordinate of the central axis monitoring point of each monitoring section on each segment of the first construction batch of steel box girder segments; 1，1 It is the mileage coordinate of the central axis monitoring point of the first monitoring section on each segment of the first construction batch of steel box girder segments; the superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinate of the reference position; the superscript w is the measured coordinate after the steel box girder is assembled; the superscript T is the coordinate value when the coordinate of the steel box girder after assembly is converted to the reference position.

[0159] S6, after the measured coordinates of each monitoring point of the first construction batch of steel box girder sections after assembly are collected, the first construction batch of steel box girder sections are pushed into place.

[0160] S7, after the first batch of steel box girder sections are pushed into place, collect the measured coordinates of each monitoring point after the first batch of steel box girder sections are pushed into place.

[0161] S8, modeling on the bridge design software Midas CIVIL, calculating and analyzing the theoretical deformation values ​​of the second batch of steel box girder segments from the pre-assembly state to the assembled state under the influence of various factors

[0162] in:

[0163] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0164] The superscript w0 is the theoretical coordinate of the steel box girder segment after assembly of a certain construction batch;

[0165] Subscript c is the number of the monitoring section.

[0166] S9, fitting the measured coordinates of the first batch of steel box girder segments after jacking into place, and calculating the alignment error;

[0167] The first batch of steel box girder sections has been pushed out, and preparations are underway for the assembly of the second batch of steel box girder sections.

[0168] Assume that the last section of the first construction batch of steel box girder segments is numbered b1, the monitoring sections c are numbered 3b1-2, 3b1-1, 3b1, and the measured elevation values ​​are: The measured coordinate values ​​of the transverse direction of the bridge are: Fit the measured coordinate values ​​of the three monitoring points of each monitoring section of the last section of the first construction batch of steel box girder segments after assembly to obtain the elevation correction values ​​of the monitoring points of the central axis of each monitoring section after assembly. and lateral coordinate correction value See the following formula (6):

[0169]

[0170] Combined with the coordinate values ​​of the assembled steel box girder segments of the first construction batch, the coordinate values ​​are converted to the reference position. The conversion translation distance and rotation angle are calculated based on the measured coordinate values ​​after the staged jacking is completed, which are used to calculate the coordinates of the steel box girder segments to be assembled in the second construction batch; the center axis monitoring point m at the last monitoring section of the steel box girder segments in the first construction batch is used as the coordinates of the steel box girder segments to be assembled in the second construction batch; 1,3b1 As the center of the circle, the following formula (7) is used to calculate the conversion parameters of the translation distance of the coordinates to be assembled for the second construction batch of steel box girder segments:

[0171]

[0172] The following formula (8) is used to calculate the conversion parameters of the coordinate rotation angle of the steel box girder segments to be assembled in the second construction batch:

[0173]

[0174] The error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first batch of steel box girder segments is calculated using the following formula (9):

[0175]

[0176] In the above formulas (6), (7), (8) and (9):

[0177] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0178] The superscript D is the measured coordinate of the steel box girder section after the jacking of a certain construction batch is completed;

[0179] Subscripts 3b1-2, 3b1-1, and 3b1 are monitoring section numbers;

[0180] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0181] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0182] The superscript T is the coordinate value of the assembled steel box girder when it is converted to the reference position;

[0183] Subscript c is the number of the monitoring section;

[0184] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0185] y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments.

[0186] S10, calculating the theoretical coordinates to be assembled of the second batch of steel box girder segments by combining the theoretical coordinates and the theoretical deformation values ​​of the second batch of steel box girder segments obtained by modeling analysis;

[0187] The error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first construction batch steel box girder segment should be corrected in each segment of the second construction batch steel box girder segment. The correction value of each segment of the second construction batch steel box girder segment is calculated by setting the correction coefficient, and the coordinates to be assembled of each segment of the second construction batch steel box girder segment are obtained, as shown in the following formula (10) and the following formula (11):

[0188]

[0189] In the above formulas (10) and (11):

[0190] y 2，c The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments;

[0191] The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the first construction batch of steel box girder segments;

[0192] The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position;

[0193] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0194] Subscripts c and 3b1 are monitoring section numbers;

[0195] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0196] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0197] d 2，c，L ,d 2，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the second construction batch steel box girder segment;

[0198] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0199] α 2，c， β 2，c , γ 2，c It is the error correction coefficient after the first batch of steel box girder segments are spliced ​​together;

[0200]

[0201] S11, assembling the steel box girder segments of the second construction batch according to the theoretical coordinates to be assembled of the steel box girder segments of the second construction batch; that is, positioning and hoisting each segment of the steel box girder segments of the second construction batch onto the assembly bracket, re-measuring the monitoring point coordinates of each segment of the steel box girder segments of the second construction batch, and then welding and assembling each segment into the steel box girder segments of the second construction batch.

[0202] S12, fitting and converting the measured coordinates of the assembled steel box girder segments of the second construction batch;

[0203] After the assembly of the second batch of steel box girder segments was completed and before starting the jacking, each monitoring point on each section of the second batch of steel box girder segments was measured, and then the measured coordinate values ​​of the three monitoring points on each monitoring section after assembly were fitted, as shown in the following formula (12):

[0204]

[0205] In the above formula (12):

[0206] It is the elevation correction value of the central axis monitoring points of each monitoring section of the second construction batch of steel box girder segments after assembly;

[0207] The measured elevation values ​​of each monitoring section of the second construction batch of steel box girder sections;

[0208] The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the second construction batch of steel box girder segments after assembly;

[0209] The measured coordinate values ​​of each monitoring section in the transverse direction of the bridge for the second construction batch of steel box girder sections;

[0210] Combined with the measured coordinate values ​​of the first construction batch of steel box girder segments after assembly and the measured coordinate values ​​of the second construction batch of steel box girder segments after assembly and the coordinate conversion values ​​of the last section of the first construction batch of steel box girder segments after assembly, calculate the conversion parameters when the coordinates of the second construction batch of steel box girder segments after assembly are converted to the reference position; take the center axis monitoring point m at the last monitoring section of the first construction batch of steel box girder segments as the reference position; 1,3b1 As the center of the circle, the conversion parameter of the translation distance of the assembled coordinates of the second construction batch of steel box girder segments is obtained, as shown in the following formula (13):

[0211]

[0212] The conversion parameters of the rotation angle of the assembled coordinates of the second construction batch of steel box girder segments are obtained as shown in the following formula (14):

[0213]

[0214] The coordinate values ​​of the assembled steel box girder segments of the second construction batch when they are converted to the reference position are calculated using the following formula (15):

[0215]

[0216] In the above formulas (12), (13), (14) and (15):

[0217] y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments;

[0218] y 2，c The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments;

[0219] The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the first construction batch of steel box girder segments;

[0220] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0221] The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch;

[0222] Subscript c is the monitoring section number;

[0223] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0224] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0225] Δμ, Δω, and Δθ correspond to the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane.

[0226] S13, after the measured coordinates of the monitoring points of the second construction batch of steel box girder sections after assembly are collected, the second construction batch of steel box girder sections are pushed into place.

[0227] S14, after the second construction batch of steel box girder sections are pushed into place, the measured coordinates of each monitoring point after the second construction batch of steel box girder sections are pushed into place are collected.

[0228] S15, fitting the measured coordinates of the second batch of steel box girder segments after jacking into place, and calculating the alignment error;

[0229] The second batch of steel box girder sections has been pushed out, and preparations are underway for the assembly of the third batch of steel box girder sections.

[0230] Assume that the last section of the second construction batch of steel box girder segments is numbered b2, the monitoring sections are numbered 3b2-2, 3b2-1, 3b2, and the measured elevation values ​​are: The measured coordinate values ​​of the transverse direction of the bridge are: Fit the measured coordinate values ​​of the three monitoring points of each monitoring section after assembly to obtain the elevation correction value of the monitoring points of the central axis of each monitoring section after assembly and lateral coordinate correction value See the following formula (6):

[0231]

[0232] Combined with the coordinate values ​​of the second batch of steel box girder segments after assembly, the coordinates are converted to the reference position. The coordinates measured after the staged jacking are calculated to calculate the translation distance and rotation angle, which are used to calculate the coordinates of the steel box girder segments to be assembled in the third construction batch; the last monitoring point m of the steel box girder segments in the second construction batch is used to calculate the coordinates of the steel box girder segments to be assembled in the third construction batch; 2,3b2 As the center of the circle, the conversion parameters of the translation distance of the coordinates to be assembled of the third construction batch of steel box girder segments are calculated using formula (7):

[0233]

[0234] Formula (8) is used to calculate the conversion parameters of the coordinate rotation angle of the third construction batch of steel box girder segments to be assembled:

[0235]

[0236] Formula (9) is used to calculate the error between the actual stress-free linear shape and the theoretical stress-free linear shape of the second construction batch of steel box girder segments:

[0237]

[0238] In the above formulas (6), (7), (8) and (9):

[0239] The superscript D is the measured coordinate of the steel box girder section after the jacking of a certain construction batch is completed;

[0240] Subscripts 3b2-2, 3b2-1, and 3b2 are the numbers of the monitoring sections;

[0241] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0242] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0243] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0244] Subscript c is the number of the monitoring section;

[0245] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0246] y 2，c ,y 2，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments.

[0247] S16, repeating steps S7 to S15, and completing the assembly and jacking construction of the third construction batch of steel box girder segments to the a-1 construction batch of steel box girder segments;

[0248] S17, repeating steps S7 to S13 to perform assembly and jacking construction of the steel box girder segments of the ath construction batch;

[0249] ① After the a-1 construction batch of steel box girder segments are pushed into place, collect the measured coordinates of each monitoring point after the a-1 construction batch of steel box girder segments are pushed into place;

[0250] ② The steel box girder segments of the first construction batch were modeled on the bridge design software Midas CIVIL, and the theoretical deformation values ​​of the steel box girder segments of the first construction batch from the state to be assembled to the state after assembly were calculated and analyzed under the influence of various factors.

[0251] ③ Fit the measured coordinates of the steel box girder segment of the a-1 construction batch after jacking into place and calculate the linear error;

[0252] Assume that the jacking of the steel box girder section of the a-1 construction batch has been completed, and preparations are being made for the assembly of the steel box girder section of the a construction batch.

[0253] Assume that the last section of the steel box girder section of the a-1 construction batch is numbered ba-1, and the monitoring section is numbered 3b a-1 -2, 3b a-1 -1,3b a-1 , the measured elevation value is: The measured coordinate values ​​of the transverse direction of the bridge are: Fit the measured coordinate values ​​of the three monitoring points of each monitoring section after assembly to obtain the elevation correction value of the monitoring points of the central axis of each monitoring section after assembly and lateral coordinate correction value See the following formula (6):

[0254]

[0255] Combined with the coordinate values ​​of the assembled steel box girder segments of the a-1 construction batch when the coordinates are converted to the reference position The conversion translation distance and rotation angle are calculated based on the measured coordinate values ​​after the staged jacking is completed, which are used to calculate the coordinates of the steel box girder segment to be assembled in the a construction batch; the monitoring point m at the center axis of the last monitoring section of the steel box girder segment in the a-1 construction batch is used. a-1,3ba-1 As the center of the circle, the conversion parameter of the translation distance of the coordinates to be assembled of the steel box girder segment of the ath construction batch is calculated using formula (7):

[0256]

[0257] Formula (8) is used to calculate the conversion parameters of the coordinate rotation angle of the steel box girder segment to be assembled in the ath construction batch:

[0258]

[0259] Formula (9) is used to calculate the error between the actual stress-free linear shape and the theoretical stress-free linear shape of the steel box girder segment in the a-1 construction batch:

[0260]

[0261] In the above formulas (6), (7), (8) and (9):

[0262] The superscript D is the measured coordinate of the steel box girder section after the jacking of a certain construction batch is completed;

[0263] Subscripts 3b2-2, 3b2-1, and 3b2 are the numbers of the monitoring sections;

[0264] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0265] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0266] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0267] Subscript c is the number of the monitoring section;

[0268] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0269] The subscripts a-1 and a are the construction batch numbers of the steel box girders;

[0270] y a-1，c ,y a-1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the steel box girder segment of the a-1 construction batch.

[0271] ④ Calculate the theoretical coordinates of the steel box girder segments of the a construction batch based on the theoretical deformation values ​​of the steel box girder segments obtained through modeling analysis;

[0272] The error between the actual stress-free linear shape and the theoretical stress-free linear shape of the steel box girder segment of the a-1 construction batch needs to be corrected on each segment of the steel box girder segment of the a-1 construction batch. The correction value of each segment of the steel box girder segment of the a-1 construction batch is calculated by setting the correction coefficient, and the coordinates to be assembled of each segment of the steel box girder segment of the a-1 construction batch are obtained, as shown in the following formula (10) and the following formula (11):

[0273]

[0274]

[0275] In the above formulas (10) and (11):

[0276] The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled;

[0277] Subscripts c and 3b1 are monitoring section numbers;

[0278] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0279] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0280] d a，c，L , d a，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the steel box girder section of the construction batch a;

[0281] Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively;

[0282] α a，c , β a，c , γ a，c is the error correction coefficient after the steel box girder segments of the a-1 construction batch are spliced ​​together;

[0283]

[0284] ⑤ Assemble the batch a of steel box girders according to the theoretical coordinates to be assembled;

[0285] According to the theoretical coordinates of the steel box girder sections of the a construction batch, each segment of the steel box girder sections of the a construction batch is positioned and hoisted onto the assembly bracket, the monitoring point coordinates of each segment of the steel box girder sections of the a construction batch are remeasured, and then the welding and assembly of each segment of the steel box girder sections of the a construction batch are completed.

[0286] ⑥ Fit and transform the measured coordinates of the steel box girder segments after assembly in the a construction batch;

[0287] After the assembly of the steel box girder section of the a construction batch is completed and before the jacking begins, the measured coordinate values ​​of each monitoring point on the steel box girder section of the a construction batch are measured; the measured coordinate values ​​of the three monitoring points on each monitoring section of the steel box girder section of the a construction batch are fitted to obtain the elevation correction value of the monitoring points on the central axis of each monitoring section after assembly. and lateral coordinate correction value See the following formula (12):

[0288]

[0289] Combined with the measured coordinate values ​​of the steel box girder segments of the a-1 construction batch after assembly, the measured coordinate values ​​of the steel box girder segments of the a construction batch after assembly, and the coordinate conversion values ​​of the last segment of the steel box girder segments of the a-1 construction batch after assembly, calculate the conversion parameters when the coordinates of the steel box girder segments of the a construction batch after assembly are converted to the reference position; take the monitoring point m at the center axis of the last monitoring section of the steel box girder segments of the a-1 construction batch as the reference position; a-1,3ba-1 As the center of the circle, the conversion parameter of the translation distance of the assembled coordinates of the steel box girder segment of the ath construction batch is obtained, as shown in the following formula (13):

[0290]

[0291] The conversion parameter of the rotation angle of the assembled coordinates of the steel box girder segment of the ath construction batch is obtained, as shown in the following formula (14):

[0292]

[0293] The coordinate values ​​of the assembled steel box girder segment of the ath construction batch when it is converted to the reference position are calculated using the following formula (15):

[0294]

[0295] In the above formulas (12), (13), (14) and (15):

[0296] y a-1，c ,y a-1，c-1 The mileage coordinates of the monitoring points on the central axis of each monitoring section on each segment of the steel box girder section of the a-1 construction batch;

[0297] y a，c The mileage coordinates of the monitoring points on the central axis of each monitoring section on each segment of the steel box girder section of construction batch a;

[0298] The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the steel box girder section of the a-1 construction batch;

[0299] The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position;

[0300] The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch;

[0301] Subscript c is the monitoring section number;

[0302] The subscript L refers to the monitoring point located on the left side of the monitoring section;

[0303] The subscript R refers to the monitoring point located on the right side of the monitoring section;

[0304] Δμ, Δω, and Δθ correspond to the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane.

[0305] ⑦ Push the steel box girder section of construction batch a into place.

[0306] S18, beam dropping is completed.

[0307] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A method for controlling the linear shape of a steel box girder for loose assembly construction, characterized in that: The control method comprises the following steps: S1, assuming that the total construction batch of steel box girders is a, linear monitoring points are arranged on the steel box girder section of each construction batch; S2, modeling on bridge design software, calculating and analyzing the theoretical deformation values ​​of the first batch of steel box girder segments under the influence of various factors; S3, combining the theoretical coordinates and the theoretical deformation values ​​of the first batch of steel box girder segments obtained by modeling analysis to calculate the theoretical coordinates to be assembled of the first batch of steel box girder segments; S4, assembling the first construction batch of steel box girder segments according to the theoretical coordinates to be assembled of the first construction batch of steel box girder segments; S5, fitting and converting the measured coordinates of the assembled steel box girder segments of the first construction batch; S6, pushing the first batch of steel box girder segments into place; S7, collecting the measured coordinates of the first batch of steel box girder segments after jacking into place; S8, modeling on bridge design software, calculating and analyzing the theoretical deformation values ​​of the second construction batch of steel box girder segments under the influence of various factors; S9, fitting the measured coordinates of the first batch of steel box girder segments after jacking into place, and calculating the alignment error; S10, calculating the theoretical coordinates to be assembled of the second batch of steel box girder segments by combining the theoretical coordinates and the theoretical deformation values ​​of the second batch of steel box girder segments obtained by modeling analysis; S11, assembling the second construction batch of steel box girder segments according to the theoretical coordinates to be assembled of the second construction batch of steel box girder segments; S12, fitting and converting the measured coordinates of the assembled steel box girder segments of the second construction batch; S13, pushing the second batch of steel box girder segments into place; S14, collecting the measured coordinates of the second construction batch of steel box girder segments after jacking into place; S15, fitting the measured coordinates of the second batch of steel box girder segments after jacking into place, and calculating the alignment error; S16, repeating steps S7 to S15, sequentially performing assembly and jacking construction of the third construction batch of steel box girder segments to the a-1th construction batch of steel box girder segments; S17, repeating steps S7 to S13 to perform assembly and jacking construction of the steel box girder segments of the ath construction batch; S18, beam dropping is completed.

2. The method for controlling the linear shape of steel box girders for loose assembly construction according to claim 1, characterized in that: During step S1, three monitoring sections are set longitudinally on each section of the steel box girder segment of each construction batch, located at the front end, middle part and rear end of each section respectively. Three monitoring points are arranged on each monitoring section, located at the center axis position of each section, the center line position of the left web plate and the center line position of the right web plate respectively. The number of segments of the steel box girder segment in construction batch a is B a , then the numbers of each section of the steel box girder section of the a construction batch are b a , the monitoring section of each segment is numbered c, i.e. c = 3b a -2, 3b a -1,3b a , the numbers of the three monitoring points on the monitoring section c are m 1,c,L , m 1,c , m 1,c,R ; The bth steel box girder section of the ath construction batch a The nine monitoring points on the segment are numbered as follows: Subscript a is the construction batch; subscript ba is the segment number of the ath construction batch; subscript L is the monitoring point on the centerline of the web on the left side of the monitoring section; subscript R is the monitoring point on the centerline of the web on the right side of the monitoring section.

3. The method for controlling the linear shape of steel box girders for loose assembly construction according to claim 1, characterized in that: When performing step S3, assuming that the first batch of steel box beam segments has B1 segments, the segments are numbered 1 to b1, the monitoring sections of each segment are numbered 1 to 3b1, and the monitoring points are numbered m. 1,c,L , m 1,c , m 1,c,R , c=3b1-2,3b1-1,3b1; The theoretical coordinates to be assembled are calculated from the reference coordinates using the theoretical stress-free linear shape. The calculation formulas are shown in the following equations (1) and (2): In the above formula (1) and formula (2): The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position; The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled; The superscript w0 is the theoretical coordinate of the steel box girder segment after assembly of a certain construction batch; Subscript c is the number of the monitoring section of each segment; The subscript L is the monitoring point on the web centerline on the left side of the monitoring section; The subscript R is the monitoring point on the web centerline on the right side of the monitoring section; is the theoretical deformation value of the steel box girder segment of the first construction batch from the state to be assembled to the state after assembly; d 1，c，L , d 1，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the first construction batch of steel box girder segments; μ 1，c is the angle between the center axis of the steel box girder segment of the first construction batch and the Y axis on the XY plane; is the transverse slope angle of the first construction batch of steel box girder segments at the monitoring section c, 4. The method for controlling the linear shape of steel box girders for loose assembly construction according to claim 1, characterized in that: In step S5, after the assembly of the first batch of steel box girder segments is completed and before starting to push, each monitoring point on each section of the first batch of steel box girder segments is measured, and the measured elevation value of each monitoring section is set to: The measured coordinate values ​​of the transverse direction of the bridge are: c=3b1-2, 3b1-1, 3b1, and then fit the measured coordinate values ​​of the three monitoring points of each monitoring section after assembly, see the following formula (3): The coordinates of the assembled steel box girder segments of the first construction batch are transformed to the location of the reference coordinates through translation and rotation, and are fitted and corrected with the theoretical stress-free linear shape; the translation value and rotation angle are calculated using the following formula (4): In the above formulas (3) and (4), It is the elevation correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly; The measured elevation values ​​of each monitoring section of the first construction batch of steel box girder sections; The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the first construction batch of steel box girder segments after assembly; The measured coordinate values ​​of each monitoring section in the transverse direction of the bridge for the first construction batch of steel box girder segments; The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position; The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch; Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively; The coordinate values ​​of the assembled steel box girder segments of the first construction batch after conversion to the reference position are further calculated and shown in the following formula (5): In the above formula (5), y 1，c y is the mileage coordinate of the central axis monitoring point of each monitoring section on each segment of the first construction batch of steel box girder segments; 1，1 It is the mileage coordinate of the central axis monitoring point of the first monitoring section on each segment of the first construction batch of steel box girder segments; the superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinate of the reference position; the superscript w is the measured coordinate after the assembly of the steel box girder segments of a certain construction batch; the superscript T is the coordinate value of the assembled steel box girder segments of a certain construction batch when it is converted to the reference position.

5. The method for controlling the linear shape of steel box girders for loose assembly construction according to claim 1, characterized in that: During step S9, the first batch of steel box girder segments has been pushed out, and the second batch of steel box girder segments is ready for assembly. Assume that the last section of the first construction batch of steel box girder segments is numbered b1, the monitoring sections c are numbered 3b1-2, 3b1-1, 3b1, and the measured elevation values ​​are: The measured coordinate values ​​of the transverse direction of the bridge are: Fit the measured coordinate values ​​of the three monitoring points of each monitoring section of the last section of the first construction batch of steel box girder segments after assembly to obtain the elevation correction values ​​of the central axis monitoring points of each monitoring section after assembly. and lateral coordinate correction value See the following formula (6): Combined with the coordinate values ​​of the first batch of steel box girder segments after assembly, the coordinates are converted to the reference position The conversion translation distance and rotation angle are calculated based on the measured coordinate values ​​after the staged jacking is completed, which are used to calculate the coordinates of the steel box girder segments to be assembled in the second construction batch; the center axis monitoring point m at the last monitoring section of the steel box girder segments in the first construction batch is used as the coordinates of the steel box girder segments to be assembled in the second construction batch; 1,3b1 As the center of the circle, the following formula (7) is used to calculate the conversion parameters of the translation distance of the coordinates to be assembled for the second construction batch of steel box girder segments: The following formula (8) is used to calculate the conversion parameters of the coordinate rotation angle of the steel box girder segments to be assembled in the second construction batch: The error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first batch of steel box girder segments is calculated using the following formula (9): In the above formulas (6), (7), (8) and (9): The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position; The superscript D is the measured coordinate of the steel box girder section after the jacking of a certain construction batch is completed; Subscripts 3b1-2, 3b1-1, and 3b1 are monitoring section numbers; The subscript L refers to the monitoring point located on the left side of the monitoring section; The subscript R refers to the monitoring point located on the right side of the monitoring section; The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position; Subscript c is the number of the monitoring section; Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively; y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments; When performing step S10, the error between the actual stress-free linear shape and the theoretical stress-free linear shape of the first construction batch steel box girder segment is corrected for each segment of the second construction batch steel box girder segment. The correction value of each segment of the second construction batch steel box girder segment is calculated by setting the correction coefficient, and the coordinates to be assembled of each segment of the second construction batch steel box girder segment are obtained, as shown in the following formula (10) and the following formula (11): In the above formulas (10) and (11): y 2，c The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments; The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the first construction batch of steel box girder segments; The superscript 0 is the linear shape in the theoretical stress-free state, that is, the corresponding coordinates of the reference position; The superscript p is the positioning coordinate of the steel box girder segment of a certain construction batch when it is hoisted to the position to be assembled; Subscripts c and 3b1 are monitoring section numbers; The subscript L refers to the monitoring point located on the left side of the monitoring section; The subscript R refers to the monitoring point located on the right side of the monitoring section; d 2，c，L ,d 2，c，R One-to-one correspondence is the lateral offset between the left web monitoring point and the center axis monitoring point and the lateral offset between the right web monitoring point and the center axis monitoring point on the same monitoring section of the second construction batch steel box girder segment; Δμ, Δω, and Δθ are the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane respectively; α 2，c , β 2，c , γ 2，c It is the error correction coefficient after the first batch of steel box girder segments are assembled; 6. The method for controlling the linear shape of steel box girders for loose assembly construction according to claim 1, characterized in that: When performing step S12, after the second batch of steel box girder segments are assembled, before starting to push, each monitoring point on each section of the second batch of steel box girder segments is measured, and then the measured coordinate values ​​of the three monitoring points on each monitoring section after assembly are fitted, as shown in the following formula (12): It is the elevation correction value of the central axis monitoring points of each monitoring section of the second construction batch of steel box girder segments after assembly; The measured elevation values ​​of each monitoring section of the second construction batch of steel box girder sections; The horizontal coordinate correction value of the central axis monitoring points of each monitoring section of the second construction batch of steel box girder segments after assembly; These are the measured coordinate values ​​of the transverse direction of the bridge for each monitoring section of the second construction batch of steel box girder segments. Combined with the measured coordinate values ​​of the first construction batch of steel box girder segments after assembly and the measured coordinate values ​​of the second construction batch of steel box girder segments after assembly and the coordinate conversion values ​​of the last section of the first construction batch of steel box girder segments after assembly, calculate the conversion parameters when the coordinates of the second construction batch of steel box girder segments after assembly are converted to the reference position; take the center axis monitoring point m at the last monitoring section of the first construction batch of steel box girder segments as the reference position; 1,3b1 As the center of the circle, the conversion parameter of the translation distance of the assembled coordinates of the second construction batch of steel box girder segments is obtained, as shown in the following formula (13): The conversion parameters of the rotation angle of the assembled coordinates of the second construction batch of steel box girder segments are obtained as shown in the following formula (14): The coordinate values ​​of the assembled steel box girder segments of the second construction batch when they are converted to the reference position are calculated using the following formula (15): In the above formulas (12), (13), (14) and (15): y 1，c ,y 1，c-1 The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the first construction batch of steel box girder segments; y 2，c The mileage coordinates of the central axis monitoring points of each monitoring section on each segment of the second construction batch of steel box girder segments; The mileage coordinates of the centerline monitoring point of the last monitoring section on the last segment of the first construction batch of steel box girder segments; The superscript T is the coordinate value of the assembled steel box girder segment of a certain construction batch when it is converted to the reference position; The superscript w is the measured coordinate of the steel box girder segment after assembly of a certain construction batch; Subscript c is the monitoring section number; The subscript L refers to the monitoring point located on the left side of the monitoring section; The subscript R refers to the monitoring point located on the right side of the monitoring section; Δμ, Δω, and Δθ correspond to the rotation angles of the steel box girder section of a certain construction batch on the XY plane, YZ plane, and XZ plane.

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