Cable-stayed bridge closure section length measuring and cutting method and system

Abstract

The invention discloses a cable-stayed bridge closure section length measuring and cutting method and system. The method comprises the following steps that before a bridge is closed, steel plates (4) are welded to top plates and bottom plates of the sections of the front ends of a first cantilever beam section (1) and a second cantilever beam section (2), and reflective stickers are pasted to serve as measuring targets; erecting a total station on the cantilever beam sections at the two ends, and starting to continuously observe the target and record coordinates and corresponding temperatures after completing orientation of the total station according to the set reference points; according to the obtained coordinates and the corresponding temperature, displacement of the cantilever end generated when the temperature changes by 1 DEG C is calculated; according to the construction organization plan, the temperature of the closure day is determined; establishing a full-bridge model by using finite elements, and respectively calculating the longitudinal displacement of the counterweight and the hoisting closure section (3) to the cantilever end; and according to the relative position of each measuring point, calculating the matching and cutting length of each point. The method is high in measurement speed, the size of the closure section can be accurately obtained, the matching and cutting precision is improved, field adjustment and reworking are reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and more specifically, relates to a method and system for measuring and matching the length of a closure section of a cable-stayed bridge. Background Art

[0002] Cable-stayed bridges have become one of the fastest-growing and most competitive bridge types due to their advantages such as high overall stiffness, excellent wind resistance, strong spanning capacity, and diverse structural arrangements. In the process of bridge construction, bridge closure is a very critical link. For cable-stayed bridges, closure construction control is particularly important. Cable-stayed bridges are composed of main beams, cable-stayed cables, and bridge towers, and the cable-stayed cables bear most of the load. Its structural design requires high-precision construction and measurement to ensure the reasonable coordination of various components. The closure section is the key connecting part of the bridge, and its accurate measurement has an important impact on subsequent construction operations and the overall performance of the bridge.

[0003] Common ways to close the steel beams of cable-stayed bridges include jacking and temperature matching. Since deviations are inevitable during the construction and manufacturing of bridges, which directly leads to the size of the closed section not being a completely regular shape, it is necessary to obtain a large amount of data through continuous measurement, and consider other factors with greater influence, and then obtain the precise length of the closed section through precise calculation, so as to ensure that the width of the closed weld is within the required range of the specification.

[0004] During the construction of the cable-stayed bridge, the jointing of the joint section requires high-precision measurement to ensure the accuracy of the construction. The accuracy of the joint section length determines the degree of fit between the last section of the beam and the built part, which in turn affects the smooth construction of the entire bridge. During the construction of the joint section, temperature changes, material shrinkage and load changes, any slight error may cause deformation of the structure. Therefore, accurate measurement and adjustment of the joint section is the key to ensuring construction quality. If the length is not appropriate, it may lead to adjustments and rework during the construction process, increasing construction costs and time. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method and system for measuring and matching the length of the joint section of a cable-stayed bridge. By welding a steel plate on the cantilever end of the steel box girder and affixing a reflective sticker, the measuring point can be kept fixed, reducing the error caused by manual operation. The total station can measure the reflective sticker at a fast speed, which can reduce the influence of the position change of the measuring point caused by the drastic change of the external ambient temperature. The matching value of each point is calculated based on the theoretical center pile number, which can eliminate the situation where the cantilever end edge lines are not in the same plane due to construction and manufacturing. By arranging measuring points on the front end cross section of the cantilever and performing continuous observation, combined with the displacement effect of the cantilever end caused by temperature changes, and establishing a bridge model in combination with a finite element program, it can simulate various loads and effects in the actual construction process, and can accurately obtain the size of the joint section, improve the accuracy of the matching of the joint section, reduce on-site adjustments and rework, and improve construction efficiency.

[0006] In order to achieve the above object, according to a first aspect of the present invention, a method for measuring and cutting the length of a closure section of a cable-stayed bridge is provided, comprising the following steps:

[0007] S100: Before the bridge is closed, steel plates are respectively welded at the positions where the top plate, the bottom plate and the web plate of the front end sections of the first cantilever beam section and the second cantilever beam section are connected, and reflective stickers are affixed to the steel plates on the first cantilever beam section and the second cantilever beam section in opposite directions as measurement targets for the total station;

[0008] S200: setting up a first total station and a second total station on the first cantilever beam segment and the second cantilever beam segment respectively, then selecting a first reference point and a second reference point on the first cantilever beam segment and the second cantilever beam segment respectively, and completing the orientation of the first total station and the second total station by selecting the first reference point and the second reference point, and starting to continuously observe the target, and recording the coordinates during measurement and the corresponding temperature;

[0009] S300: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ;

[0010] S400: According to the construction organization plan, the specific time of the joint closure is calculated based on the existing construction procedures, and then the weather station is checked to determine the weather temperature T on the day of the joint closure. 0 ;

[0011] S500: Establishing a full bridge model based on finite element analysis, and calculating the longitudinal displacement Δ caused by the counterweight on the first cantilever beam segment and the second cantilever beam segment respectively 1 and Δ 2 And the longitudinal displacement Δ caused by the lifting and closure section to the first cantilever beam section and the second cantilever beam section 3 and Δ 4 ;

[0012] S600: Calculate the cutting length of each point according to the relative position relationship of each measuring point of the top and bottom plates.

[0013] Furthermore, in step S100, the reflective stickers on the top measuring plate of the small pile number are numbered Tx1 to TXn, the reflective stickers on the top measuring plate of the large pile number are numbered Td1 to Tdn, the reflective stickers on the bottom measuring plate of the small pile number are numbered Dx1 to Dxn, and the reflective stickers on the bottom measuring plate of the large pile number are numbered Dd1 to Ddn.

[0014] Furthermore, in step S200, when the target is continuously observed, the coordinates of the measuring points are measured every 4 hours from 8 am to 8 pm during the day, and every 2 hours from 8 pm to 8 am the next day. The measurement is continued for 3 days and the coordinates X are recorded. i ′、Y i ′、Z i ′ and its corresponding temperature Temp (i) .

[0015] Furthermore, in step S200, after measuring the coordinates X of each measuring point, i ′、Y i ′、Z i ′ is the geodetic coordinate, and then the geodetic coordinate of the measuring point is converted into the bridge position coordinate X i , Y i , Z i , the positional relationship between the geodetic coordinates and the bridge position coordinates is as follows:

[0016] X i =X i ′cosβ-Y i ′sinβ+Δx

[0017] Y i =Y i ′cosβ+X i ′sinβ+Δy

[0018] Z i =Z i '

[0019] Among them, i is the measuring points numbered Tx1~Txn on the top plate of the small pile number, the measuring points numbered Td1~Tdn on the top plate of the large pile number, the measuring points numbered Dx1~Dxn on the bottom plate of the small pile number, and the measuring points numbered Dd1~Ddn on the bottom plate of the large pile number.

[0020] X i is the longitudinal direction of the bridge coordinates,

[0021] Y i is the transverse direction of the bridge position coordinates,

[0022] Z i is the vertical direction of the bridge coordinates,

[0023] Δx and Δy are the coordinate values ​​of the origin of the geodetic coordinate system in the bridge coordinate system.

[0024] β is the azimuth between the earth coordinate system and the bridge coordinate system.

[0025] Furthermore, in step S300, by measuring the temperature Temp at each measuring point (i) The coordinate X i , X i With Temp (i) Fitting into a linear equation form:

[0026]

[0027] Among them, X i is the longitudinal direction of the bridge coordinates,

[0028] Temp (i) For X i The temperature corresponding to the coordinates,

[0029] B is a constant,

[0030] A i The displacement of the cantilever end at each measuring point when the temperature changes by 1°C.

[0031] Furthermore, in step S300, since there are many measuring points at the joint mouth, in order to reduce errors and improve the accuracy of the results, the displacement change rates of all observation points on the top plate and bottom plate on each side are averaged, that is, the displacement of the cantilever end caused by a 1°C change in the temperature of each top and bottom plate is:

[0032]

[0033] Where n is the number of measuring points.

[0034] Furthermore, in step S500, when the finite element method is used to establish the bridge model, the main beam and the main tower structure are simulated by beam units, the inclined cable is simulated by truss units, the inclined cable and the main beam are rigidly connected, the main tower and the main beam are not consolidated, the counterweight is simulated by uniformly distributed load or concentrated force, the load generated by the lifting and closure section is loaded on the main beam unit by concentrated force, and the bridge stiffness needs to be corrected based on the comparison between the previous measured values ​​and the calculated values, so that the measured displacement is consistent with the calculated displacement.

[0035] Furthermore, in the step S600, when calculating the matching length of each measuring point, the matching length L1 at each measuring point is calculated based on the theoretical pile number DK of the theoretical center line of the bridge. i 、L2 i ; The calculation formula for the matching length at each measuring point is:

[0036] L1 i =DK-X i +Δ 1 +Δ 3 -Δ T ×(T 0 -T 测 )

[0037] L2 i =X i -DK+Δ 2 +Δ 4 -Δ T ×(T 0 -T 测 )

[0038] Among them, L1 i The length of the matching cut for the i-th measuring point of the small pile number,

[0039] L2 i The matching length of the i-th measuring point of the large pile number is measured.

[0040] T 0 is the temperature of the joint section when it is closed,

[0041] T 测 is the temperature during continuous measurement,

[0042] X i Corresponding to temperature T 测 The coordinate values ​​of each measuring point at that time.

[0043] Furthermore, after the calculation of the matching length of each point is completed, the adjacent measuring points are connected into a straight line to determine the matching length of the remaining positions of the steel beam.

[0044] According to another aspect of an embodiment of the present invention, a system for measuring and matching the length of a closure section of a cable-stayed bridge is provided, comprising:

[0045] Measuring point setting module: used for welding steel plates at the locations where the top plate, bottom plate and web plate of the front end sections of the first cantilever beam section and the second cantilever beam section meet before the bridge is closed, and reflective stickers are affixed to the steel plates on the first cantilever beam section and the second cantilever beam section in opposite directions as measurement targets for the total station;

[0046] Data measurement module: a first total station and a second total station are respectively set up on the first cantilever beam section and the second cantilever beam section, and then a first reference point and a second reference point are respectively selected on the first cantilever beam section and the second cantilever beam section, and the first total station and the second total station are oriented by selecting the first reference point and the second reference point, and the target is continuously observed, and the coordinates during measurement and the corresponding temperature are recorded;

[0047] Data analysis module: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ;

[0048] Closure temperature determination module: According to the construction organization plan, the specific time of closure is calculated based on the existing construction procedures, and then the weather station is queried to determine the weather temperature T on the day of closure. 0 ;

[0049] Finite element calculation module: Based on the finite element, the full bridge model is established to calculate the longitudinal displacement Δ caused by the counterweight on the first cantilever beam section and the second cantilever beam section respectively. 1 and Δ 2 And the longitudinal displacement Δ caused by the lifting and closure section to the first cantilever beam section and the second cantilever beam section 3 and Δ 4 ;

[0050] Matching length calculation module: Calculate the matching length of each point based on the relative position relationship of each measuring point on the top and bottom plates.

[0051] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0052] 1. The method for measuring and cutting the length of the joint section of the present invention realizes fast and efficient measurement by measuring the reflective tape. Compared with the traditional method, such as measuring by manually setting up a prism, this method significantly reduces the operation steps, because there is no need to constantly move the prism during the measurement process, which improves the measurement speed and enhances the accuracy and stability of the measurement, providing solid data support for the precise cutting of the joint section.

[0053] 2. The method for measuring and cutting the length of the joint section of the present invention directly welds the steel plate at the cantilever end and firmly affixes the reflective sticker thereon. This design ensures the absolute fixation of the measuring point, fundamentally avoiding the slight errors that may be generated during manual operation, thereby improving the accuracy and reliability of the measurement. In addition, since the measurement method adopted by this method is fast and greatly shortens the time required for a single measurement, it can effectively reduce the impact of slight changes in the position of the measuring point caused by drastic fluctuations in the external ambient temperature, further enhancing the stability and timeliness of the measurement results.

[0054] 3. The method for measuring and matching the length of the joint section of the present invention uses the theoretical center pile number as a reference to accurately calculate the matching value of each point. This strategy effectively solves the complex problem that the cantilever end edge lines are not in the same plane due to construction errors, manufacturing deviations and other factors. Through this method, the length of the joint section can be accurately measured and reasonably matched, thereby greatly improving the accuracy and overall quality of the installation of bridges or other large structures. In addition, the application of this method also reduces the workload of subsequent adjustments, improves construction efficiency, and provides strong support for the smooth advancement and cost control of engineering projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is an elevation view of a closure section of a cable-stayed bridge closure section length measurement and matching method according to an embodiment of the present invention;

[0056] Figure 2 A cross-sectional view of a closure section of a cable-stayed bridge closure section length measurement and matching method according to an embodiment of the present invention;

[0057] Figure 3 A schematic diagram of measuring a closure section of a cable-stayed bridge closure section length measuring method according to an embodiment of the present invention;

[0058] Figure 4 A schematic diagram of the top plate matching of the closure section of a cable-stayed bridge closure section length measurement and matching method according to an embodiment of the present invention;

[0059] Figure 5 A schematic diagram of the bottom plate matching of the closure section of a cable-stayed bridge closure section length measurement and matching method according to an embodiment of the present invention;

[0060] Figure 6 A schematic flow chart of a method for measuring and matching the length of a closure section of a cable-stayed bridge according to an embodiment of the present invention.

[0061] In all the drawings, the same figure marks represent the same technical features, specifically: 1-first cantilever beam section, 2-second cantilever beam section, 3-joined section, 4-steel plate, 5-first reference point, 6-second reference point, 7-first total station, 8-second total station. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0063] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0064] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0065] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0066] Combination Figure 1-5 ,like Figure 6 As shown, according to a first aspect of the present invention, a method for measuring and cutting the length of a closure section of a cable-stayed bridge is provided, comprising the following steps:

[0067] S100: Before the bridge is closed, steel plates 4 are respectively welded at the positions where the top plate, the bottom plate and the web plate of the front end sections of the first cantilever beam section 1 and the second cantilever beam section 2 are connected, and reflective stickers are affixed to the steel plates 4 on the first cantilever beam section 1 and the second cantilever beam section 2 in opposite directions as measurement targets for the total station;

[0068] S200: setting up a first total station 7 and a second total station 8 on the first cantilever beam section 1 and the second cantilever beam section 2, respectively, then selecting a first reference point 5 and a second reference point 6 on the first cantilever beam section 1 and the second cantilever beam section 2, respectively, and completing the orientation of the first total station 7 and the second total station 8 by selecting the first reference point 5 and the second reference point 6, and starting to continuously observe the target, and recording the coordinates during measurement and the corresponding temperature;

[0069] S300: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ;

[0070] S400: According to the construction organization plan, the specific time of the joint closure is calculated based on the existing construction procedures, and then the weather station is checked to determine the weather temperature T on the day of the joint closure. 0 ;

[0071] S500: Establish a full bridge model based on finite element analysis, and calculate the longitudinal displacement Δ caused by the counterweight on the first cantilever beam segment 1 and the second cantilever beam segment 2 respectively. 1 and Δ 2 And the longitudinal displacement Δ caused by the lifting and closure section 3 to the first cantilever beam section 1 and the second cantilever beam section 2 3 and Δ 4 ;

[0072] S600: Calculate the cutting length of each point according to the relative position relationship of each measuring point of the top and bottom plates.

[0073] like Figure 1 , 2 As shown, in step S100, the steel plate 4 must be kept vertical, the reflective stickers on the top plate of small pile numbers are numbered Tx1~TXn, the reflective stickers on the top plate of large pile numbers are numbered Td1~Tdn, the reflective stickers on the bottom plate of small pile numbers are numbered Dx1~Dxn, and the reflective stickers on the bottom plate of large pile numbers are numbered Dd1~Ddn.

[0074] like Figure 3 As shown, in step S200, the first total station 7 can measure the coordinates of all measuring points on the second cantilever beam segment 2, and the second total station 8 can measure the coordinates of all measuring points on the first cantilever beam segment 1. The selected first reference point 5 and the second reference point 6 need to be stable and reliable and not affected by environmental changes.

[0075] When continuously observing the targets on the first cantilever beam section 1 and the second cantilever beam section 2, the coordinates of the measuring points are measured every 4 hours from 8 am to 8 pm, and every 2 hours from 8 pm to 8 am the next day. The measurement is continued for 3 days and the coordinates (X i ′、Y i ′、Z i ′) and its corresponding temperature Temp (i) , where X i ′ is the longitudinal direction of the coordinate, Y i ′ is the horizontal direction of the coordinate, Z i ′ is the vertical direction of the coordinate.

[0076] Measure the coordinates of each measuring point (X i ′、Y i ′、Z i ′) is the geodetic coordinate, and then the geodetic coordinate of the measuring point (X i ′、Y i ′、Z i ′) is converted into bridge position coordinates (X i , Y i , Z i ), the positional relationship between the bridge coordinates and the geodetic coordinates is as follows:

[0077] X i =X i ′cosβ-Y i ′sinβ+Δx

[0078] Y i =Y i ′cosβ+X i ′sinβ+Δy

[0079] Z i =Z i '

[0080] Among them, i is the measuring points numbered Tx1~Txn on the top plate of the small pile number, the measuring points numbered Td1~Tdn on the top plate of the large pile number, the measuring points numbered Dx1~Dxn on the bottom plate of the small pile number, and the measuring points numbered Dd1~Ddn on the bottom plate of the large pile number.

[0081] X i is the longitudinal direction of the bridge coordinates,

[0082] Y i is the transverse direction of the bridge position coordinates,

[0083] Z i is the vertical direction of the bridge coordinates,

[0084] Δx and Δy are the coordinate values ​​of the origin of the geodetic coordinate system in the bridge coordinate system.

[0085] β is the azimuth between the earth coordinate system and the bridge coordinate system.

[0086] In step S300, by measuring the temperature Temp at each measuring point (i) The coordinate X i , X i With Temp (i) Fitting into a linear equation form:

[0087]

[0088] Among them, X i is the longitudinal direction of the bridge coordinates,

[0089] Temp (i) For X i The temperature corresponding to the coordinates,

[0090] B is a constant,

[0091] A i The displacement of the cantilever end at each measuring point when the temperature changes by 1°C.

[0092] Since there are many measuring points at the joint mouth, in order to reduce errors and improve the accuracy of the results, the displacement change rates of all observation points on the top and bottom plates on each side are averaged, that is, the displacement of the cantilever end caused by a 1°C change in the temperature of each top and bottom plate is:

[0093]

[0094] Where n is the number of measuring points.

[0095] In step S500, when the bridge model is established based on the finite element method, the main beam and the main tower structure are simulated by beam units, the inclined cable is simulated by truss units, the inclined cable and the main beam are rigidly connected, the main tower and the main beam are not consolidated, the counterweight is simulated by uniformly distributed load or concentrated force, and the load generated by the lifting and closure section 3 is loaded on the main beam unit in a concentrated force manner. The bridge stiffness needs to be corrected based on the comparison between the previous measured values ​​and the calculated values ​​to make the measured displacement consistent with the calculated displacement.

[0096] like Figure 4 , 5 As shown, in step S600, when calculating the matching length of each measuring point, the matching length L1 at each measuring point is calculated based on the theoretical pile number DK of the theoretical center line of the bridge. i 、L2 i ; The calculation formula for the matching length at each measuring point is:

[0097] L1i =DK-X i +Δ 1 +Δ 3 -Δ T ×(T 0 -T 测 )

[0098] L2 i =X i -DK+Δ 2 +Δ 4 -Δ T ×(T 0 -T 测 )

[0099] Among them, L1 i The length of the matching cut for the i-th measuring point of the small pile number,

[0100] L2 i The matching length of the i-th measuring point of the large pile number is measured.

[0101] T 0 is the temperature of the joint section when it is closed,

[0102] T 测 is the temperature during continuous measurement,

[0103] X i Corresponding to temperature T 测 The coordinate values ​​of each measuring point at that time.

[0104] After the calculation of the matching length of each point is completed, these adjacent measuring points are connected into straight line segments in sequence to determine the matching length of the remaining positions of the steel beam, so as to construct the overall outline of the steel box beam; in this process, it is necessary to ensure that the connection between each measuring point and its adjacent points is accurate, and according to the calculated matching length, these straight line segments are finely adjusted to accurately determine the matching length of the steel box beam at the remaining positions. This can ensure that during the production and installation of the steel beam, each part can be tightly connected together, so as to achieve the design accuracy and strength requirements. In this way, the processing and installation of the steel box beam can be efficiently promoted to ensure the smooth progress of the entire project.

[0105] According to a second aspect of the present invention, a system for measuring and matching the length of a closure section of a cable-stayed bridge is provided, comprising:

[0106] Measuring point setting module: used for welding steel plates 4 at the positions where the top plate, bottom plate and web plate of the front end sections of the first cantilever beam section 1 and the second cantilever beam section 2 meet before the bridge is closed, and reflective stickers are affixed to the steel plates 4 on the first cantilever beam section 1 and the second cantilever beam section 2 in opposite directions as measurement targets for the total station;

[0107] Data measurement module: a first total station 7 and a second total station 8 are respectively set up on the first cantilever beam section 1 and the second cantilever beam section 2, and then a first reference point 5 and a second reference point 6 are respectively selected on the first cantilever beam section 1 and the second cantilever beam section 2, and the first total station 7 and the second total station 8 are oriented by selecting the first reference point 5 and the second reference point 6, and the target is continuously observed, and the coordinates during measurement and the corresponding temperature are recorded;

[0108] Data analysis module: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ;

[0109] Closure temperature determination module: According to the construction organization plan, the specific time of closure is calculated based on the existing construction procedures, and then the weather station is queried to determine the weather temperature T on the day of closure. 0 ;

[0110] Finite element calculation module: Based on the finite element, the full bridge model is established to calculate the longitudinal displacement Δ caused by the counterweight on the first cantilever beam section 1 and the second cantilever beam section 2. 1 and Δ 2 And the longitudinal displacement Δ caused by the lifting and closure section 3 to the first cantilever beam section 1 and the second cantilever beam section 2 3 and Δ 4 ;

[0111] Matching length calculation module: Calculate the matching length of each point based on the relative position relationship of each measuring point on the top and bottom plates.

[0112] The method for measuring and matching the length of the joint section of the present invention can ensure that the measuring point is fixed by welding a steel plate to the cantilever end of the steel box girder and affixing a reflective sticker, thereby reducing the error caused by manual operation. The total station can measure the reflective sticker at a fast speed, thereby reducing the influence of the position change of the measuring point caused by the drastic change of the external environment temperature. The matching value of each point is calculated based on the theoretical center pile number, thereby eliminating the situation where the cantilever end edge lines are not in the same plane due to construction and manufacturing. By arranging measuring points on the front end cross section of the cantilever and performing continuous observations, the displacement influence of the cantilever end caused by temperature changes is combined, and a bridge model is established in combination with a finite element program, thereby simulating various loads and effects in the actual construction process, and being able to accurately obtain the size of the joint section, thereby improving the accuracy of the matching of the joint section, reducing on-site adjustments and rework, and improving construction efficiency.

[0113] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring and cutting the length of a closure section of a cable-stayed bridge, characterized in that: The steps include: S100: Before the bridge is closed, steel plates (4) are respectively welded at the positions where the top plate, the bottom plate and the web plate of the front end sections of the first cantilever beam section (1) and the second cantilever beam section (2) are connected, and reflective stickers are affixed to the steel plates (4) on the first cantilever beam section (1) and the second cantilever beam section (2) in opposite directions to serve as measurement targets for the total station; S200: a first total station (7) and a second total station (8) are respectively set up on the first cantilever beam section (1) and the second cantilever beam section (2), and then a first reference point (5) and a second reference point (6) are respectively selected on the first cantilever beam section (1) and the second cantilever beam section (2), and the orientation of the first total station (7) and the second total station (8) is completed by selecting the first reference point (5) and the second reference point (6), and continuous observation of the target is started, and the coordinates during measurement and the corresponding temperature are recorded; S300: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ; S400: According to the construction organization plan, the specific time of the joint closure is calculated based on the existing construction procedures, and then the weather station is checked to determine the weather temperature T0 on the day of the joint closure; S500: Establishing a full bridge model based on finite elements, respectively calculating longitudinal displacements Δ1 and Δ2 caused by the counterweight on the first cantilever beam section (1) and the second cantilever beam section (2), and longitudinal displacements Δ3 and Δ4 caused by the hoisting and closure section (3) on the first cantilever beam section (1) and the second cantilever beam section (2); S600: Calculate the cutting length of each point according to the relative position relationship of each measuring point of the top and bottom plates.

2. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to claim 1, characterized in that: In step S100, the reflective stickers on the top measuring plate of the small pile number are numbered Tx1 to TXn, the reflective stickers on the top measuring plate of the large pile number are numbered Td1 to Tdn, the reflective stickers on the bottom measuring plate of the small pile number are numbered Dx1 to Dxn, and the reflective stickers on the bottom measuring plate of the large pile number are numbered Dd1 to Ddn.

3. The method for measuring and cutting the length of the closure section of a cable-stayed bridge according to claim 1 is characterized in that: In step S200, when the target is continuously observed, the coordinates of the measuring points are measured every 4 hours from 8 am to 8 pm during the day, and every 2 hours from 8 pm to 8 am the next day. The measurement is continued for 3 days and the coordinates X are recorded. i ′、Y i ′、Z i ′ and its corresponding temperature Temp (i) .

4. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to claim 3, characterized in that: In step S200, the coordinates X of each measuring point are measured. i ′、Y i ′、Z i ′ is the geodetic coordinate, and then the geodetic coordinate of the measuring point is converted into the bridge position coordinate X i , Y i , Z i , the positional relationship between the geodetic coordinates and the bridge position coordinates is as follows: X i =X i ′cosβ-Y i ′sinβ+Δx Y i =Y i ′cosβ+X i ′sinβ+Δy WITH i =Z i ′ Among them, i is the measuring points numbered Tx1~Txn on the top plate of the small pile number, the measuring points numbered Td1~Tdn on the top plate of the large pile number, the measuring points numbered Dx1~Dxn on the bottom plate of the small pile number, and the measuring points numbered Dd1~Ddn on the bottom plate of the large pile number. X i is the longitudinal direction of the bridge coordinates, Y i is the transverse direction of the bridge position coordinates, Z i is the vertical direction of the bridge coordinates, Δx and Δy are the coordinate values ​​of the origin of the geodetic coordinate system in the bridge coordinate system. β is the azimuth between the earth coordinate system and the bridge coordinate system.

5. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to any one of claims 1 to 4, characterized in that: In step S300, by measuring the temperature Temp at each measuring point (i) The coordinate X i , X i With Temp (i) Fitting into a linear equation form: Among them, X i is the longitudinal direction of the bridge coordinates, Temp (i) For X i The temperature corresponding to the coordinates, B is a constant, A i The displacement of the cantilever end at each measuring point when the temperature changes by 1°C.

6. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to claim 5, characterized in that: In step S300, since there are many measuring points at the joint mouth, in order to reduce errors and improve the accuracy of the results, the displacement change rates of all observation points on the top plate and bottom plate on each side are averaged respectively, that is, the displacement of the cantilever end caused by each 1°C change in the temperature of each top and bottom plate is: Where n is the number of measuring points.

7. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to any one of claims 1 to 4, characterized in that: In step S500, when the bridge model is established by finite element method, the main beam and main tower structure are simulated by beam unit, the inclined cable is simulated by truss unit, the inclined cable and the main beam are rigidly connected, the main tower and the main beam are not consolidated, the counterweight is simulated by uniformly distributed load or concentrated force, the load generated by the lifting and closure section is loaded on the main beam unit by concentrated force, and the bridge stiffness needs to be corrected according to the comparison between the previous measured value and the calculated value, so that the measured displacement is consistent with the calculated displacement.

8. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to any one of claims 1 to 4, characterized in that: In step S600, when calculating the matching length of each measuring point, the theoretical pile number DK of the theoretical center line of the bridge is used as a reference to calculate the matching length L1 at each measuring point. i 、L2 i ; The calculation formula for the matching length at each measuring point is: L1 i =DK-X i +Δ1+Δ3-Δ T ×(T0-T 测 ) L2 i =X i -DK+Δ2+Δ4-Δ T ×(T0-T 测 ) Among them, L1 i The length of the matching cut for the i-th measuring point of the small pile number, L2 i The matching length of the i-th measuring point of the large pile number is measured. T0 is the temperature of the joint section when it is closed. T 测 is the temperature during continuous measurement, X i Corresponding to temperature T 测 The coordinate values ​​of each measuring point at that time.

9. A method for measuring and cutting the length of a closure section of a cable-stayed bridge according to claim 8, characterized in that: After the calculation of the cutting length at each point is completed, the adjacent measuring points are connected into a straight line to determine the cutting length of the remaining positions of the steel beam.

10. A cable-stayed bridge closure length measurement and matching system, characterized in that: The method for measuring and cutting the length of the closure section of a cable-stayed bridge according to any one of claims 1 to 9 is implemented by application, comprising: The measuring point setting module is used for respectively welding steel plates (4) at the positions where the top plate, the bottom plate and the web plate of the front end sections of the first cantilever beam section (1) and the second cantilever beam section (2) are connected before the bridge is closed, and the steel plates (4) on the first cantilever beam section (1) and the second cantilever beam section (2) are affixed with reflective stickers in opposite directions to serve as measurement targets for a total station; Data measurement module: a first total station (7) and a second total station (8) are respectively set up on the first cantilever beam section (1) and the second cantilever beam section (2), and then a first reference point (5) and a second reference point (6) are respectively selected on the first cantilever beam section (1) and the second cantilever beam section (2), and the orientation of the first total station (7) and the second total station (8) is completed by selecting the first reference point (5) and the second reference point (6), and the target is continuously observed, and the coordinates during measurement and the corresponding temperature are recorded; Data analysis module: According to the geodetic coordinate X i ′、Y i ′、Z i ′ is converted into the obtained bridge position coordinate X i , Y i , Z i And the corresponding temperature Temp (i) , calculate the displacement Δ of the cantilever end caused by a temperature change of 1°C T ; Closure temperature determination module: According to the construction organization plan, the specific time of closure is calculated based on the existing construction procedures, and then the weather station weather is queried to determine the weather temperature T0 on the day of closure; Finite element calculation module: based on the finite element, a full bridge model is established to respectively calculate the longitudinal displacements Δ1 and Δ2 caused by the counterweight on the first cantilever beam section (1) and the second cantilever beam section (2), and the longitudinal displacements Δ3 and Δ4 caused by the hoisting and closure section (3) on the first cantilever beam section (1) and the second cantilever beam section (2); Matching length calculation module: Calculate the matching length of each point based on the relative position relationship of each measuring point on the top and bottom plates.

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