Small-curve steel box girder bridge incremental launching construction method capable of achieving automatic monitoring

Abstract

The invention relates to the technical field of bridge engineering, and discloses a small-curve steel box girder bridge pushing construction method capable of realizing automatic monitoring, which comprises the following steps: S1, installing pushing equipment of a curve steel box girder, and arranging a multi-point coordinate measuring device; s2, construction is started, and a main beam axis deviation value and a beam body curve deviation included angle of the curve steel box beam are obtained in real time based on a multi-point coordinate measuring device; s3, whether the main beam axis deviation value is larger than a preset deviation value or not is judged, and whether the beam body curve deviation included angle is larger than a preset deviation included angle or not is judged; if the main beam axis deviation value is smaller than or equal to the preset deviation value and the beam body curve deviation included angle is smaller than or equal to the preset deviation included angle, incremental launching construction continues; and S4, judging whether the curved steel box girder is pushed to a design position or not, and if the curved steel box girder is pushed to the design position, ending pushing construction. In the pushing process of the small-curve steel box girder, the time consumed by transverse deviation correction of the curve steel box girder is shortened, the requirement for multipoint non-constant-speed synchronism is lowered, and then the construction risk is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a jacking construction method for a small-curve steel box girder bridge capable of realizing automatic monitoring. Background Art

[0002] Multi-point walking jacking is a construction method that uses multiple walking jacking systems to synchronously push the curved steel box girder from small mileage to large mileage in sections, and cyclically move the curved steel box girder to the designed position. In the construction of bridges across highways, the multi-point walking jacking method with better adaptability is often used for construction due to the limitations of construction safety conditions or in order to reduce the interference of construction on existing road traffic.

[0003] However, for curved steel box girders, especially those with a small radius of curvature or non-circular curved steel box girders, it is difficult for the multi-point walking jacking device to achieve synchronous control of each jacking point. During jacking construction, the curved steel box girder will inevitably have an axis deviation, and the jacking construction of the highway is also easily restricted by the traffic below, which also puts forward higher technical requirements for the linear adjustment of the curved steel box girder during the construction process.

[0004] At present, the existing research on the jacking construction of curved steel box girders mainly focuses on the mechanical behavior of jacking, risk analysis, construction optimization, etc. For curved steel box girders, especially for steel box girders with small curve radius or non-circular curves, the multi-point walking jacking construction process still has problems such as low monitoring efficiency, great difficulty in jacking construction control, and high jacking risk under spatial constraints, which leads to technical obstacles in the construction of curved steel box girders. Summary of the invention

[0005] The present invention aims to provide a small curve steel box girder bridge jacking construction method that can realize automatic monitoring, so as to reduce the time consumed for lateral deviation correction of the curved steel box girder during the jacking process of the small curve steel box girder, reduce the requirements for multi-point non-uniform speed synchronization, and thus reduce construction risks.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring, comprising the following steps:

[0007] S1, jacking preparation, installation of jacking equipment for curved steel box girders, and setting of multi-point coordinate measuring devices;

[0008] S2, collect data, start the jacking construction of the curved steel box girder, and obtain the main beam axis deviation value and beam body curve deviation angle of the curved steel box girder in real time based on the multi-point coordinate measuring device;

[0009] S3, data processing, judging whether the main beam axis deviation value is greater than the preset deviation value, judging whether the beam curve deviation angle is greater than the preset deviation angle; if the main beam axis deviation value is less than or equal to the preset deviation value and the beam curve deviation angle is less than or equal to the preset deviation angle, the jacking construction continues;

[0010] S4, judging whether the curved steel box girder is pushed to the designed position. If the curved steel box girder is pushed to the designed position, the pushing construction is completed.

[0011] The beneficial effects of this scheme are as follows: by setting a multi-point coordinate measuring device on the beam body of the curved steel box girder that is about to undergo jacking construction, the multi-point coordinate measuring device is used to perform real-time dynamic monitoring of the curved steel box girder during the construction process, and the curved steel box girder that deviates from the design route is corrected in time, thereby ensuring the smooth jacking construction of the curved steel box girder, overcoming the problems of low efficiency of manual data collection and unreal-time data collection, and performing jacking construction based on five basic methods of jacking, collection, processing, correction, and rotation through axis deviation calculation, which greatly reduces the adjustment time of the lateral deviation correction of the steel box girder, thereby solving the problem that it is difficult to correct the deviation of curved steel box girders, especially small curved steel box girders that are more difficult to control, in a timely manner during jacking construction, thereby reducing the risk of small curved steel box girder bridge construction.

[0012] Preferably, in S3, if the deviation value of the main beam axis is greater than the preset deviation value, a deviation correction method is performed, and the deviation correction method includes the following steps:

[0013] S3021, determine the transverse correction distance and longitudinal correction distance required for the main beam axis correction value. The calculation formulas for the transverse correction distance and longitudinal correction distance are:

[0014] l g =D·sin(α+β)

[0015] l h =-D·cos(α+β)

[0016] In the formula, l g is the lateral correction distance, l h is the longitudinal correction distance, D is the deviation value of the main beam axis, α is the angle between the longitudinal direction of the current jacking equipment and the x-axis of the plane coordinate system, and β is the angle between the radial direction between the actual axis and the design axis of the curved steel box girder and the x-axis of the plane coordinate system;

[0017] S3022: Based on the obtained transverse correction distance and longitudinal correction distance, use the jacking equipment to carry out transverse jacking and longitudinal jacking of the curved steel box girder in the same direction and at the same distance as the transverse correction distance and longitudinal correction distance.

[0018] Preferably, in S3, if the beam body curve deviation angle is greater than the preset deviation angle, a rotation method is performed, and the rotation method includes the following steps:

[0019] S3041, determine the rotation angle, the calculation formula of the rotation angle is:

[0020]

[0021]

[0022] Where, θ is the rotation angle; A represents the front end of the center axis of the curved steel box girder before pushing, (x A ,y A ) is the plane coordinate at A; C represents the end of the centerline of the curved steel box girder before pushing, (x c ,y c ) is the plane coordinate at C; A′ represents the front end of the center axis of the curved steel box girder after jacking, (x A′ ,y A′ ) is the plane coordinate at A′; C′ represents the end of the centerline of the curved steel box girder after jacking, (x C′ ,y C′ ) is the plane coordinate at C′; B corresponds to the position of the curved steel box girder at the axis A before jacking, and A″ is the coordinate of the plane passing through C′. Parallel arc (arc length and equal) endpoints, (x A″ ,y A″ ) is the plane coordinate at A″;

[0023] S3042, according to the rotation angle, use the jacking equipment to simultaneously correct the various parts of the curved steel box girder in proportion, so that the curved steel box girder rotates around the tail B' point of the beam body until the main axis of the curved steel box girder Arrival at the design axis position, the rotation method is completed.

[0024] Preferably, in S3041, based on the coordinates of the three points A, B, and C, the coordinate values ​​of and are further calculated. The calculation formulas for the coordinate values ​​of and are as follows: C′ =x C +l b ·cos α,y C′ =y C +l b ·sinα,x A″ =x C′ +(x A -x B ), y A″ =y C′ +(y A -y B ), xA′ =x A +l b ·cosα,y A′ =y A +l b ·sinα; where x B is the horizontal coordinate of point B, y B is the vertical coordinate of point B.

[0025] Preferably, the main beam axis deviation value is the radial deviation distance between the actual position of the curved steel box beam axis at the selected reference position and the designed position of the curved steel box beam axis, and the reference position is selected at the tail end position of the curved steel box beam or the front end position of the curved steel box beam.

[0026] Preferably, the curve deviation angle of the beam body is the curve angle between the actual axis of the curved steel box girder and the designed axis of the curved steel box girder.

[0027] Preferably, in S1, the multi-point coordinate measuring device includes a total station automatic observation station and a plurality of reflective stickers spaced apart at the side webs of the curved steel box girder, and the total station automatic observation station is established by the rear intersection method.

[0028] Preferably, in S1, the push preparation further comprises the following steps:

[0029] S1010, segment assembly site construction;

[0030] S1020, curved steel box girder setting;

[0031] S1030, erection of temporary bridge piers;

[0032] S1040, installation of jacking equipment, where the jacking equipment is a multi-point walking jacking equipment;

[0033] S1050, assembly of the tail end curved steel box girder segment, assemble the main beam in the built curved steel box girder segment assembly site according to the requirements of the construction design drawings.

[0034] Preferably, in S2, the following steps are also included:

[0035] S2010, use multi-point walking type jacking equipment to jack up the curved steel box girder, control the curved steel box girder to move forward as a whole to a set distance and then fall back;

[0036] S2020, the total station automatic observation station automatically searches for and measures the three-dimensional spatial coordinate data of the reflective stickers in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the construction method in the embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a multi-point coordinate measuring device according to an embodiment of the present invention;

[0039] Figure 3 It is an overall schematic diagram of the deviation correction method in an embodiment of the present invention;

[0040] Figure 4 It is a partial schematic diagram of the deviation correction method in an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the rotation method in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following is further described in detail through specific implementation methods:

[0043] Example

[0044] The embodiment is basically as shown in the attached Figure 1-5 As shown, Figure 1 The method for jacking construction of a small curved steel box girder bridge that can realize automatic monitoring is shown. A multi-point coordinate measuring device is set on the beam body of the curved steel box girder to be jacked, and the curved steel box girder during the construction process is monitored in real time by using the multi-point coordinate measuring device, so as to correct the curved steel box girder that deviates from the design route in time, thereby ensuring the smooth jacking construction of the curved steel box girder, overcoming the problems of low efficiency of manual data collection and unrealistic data collection, and performing jacking construction based on five basic construction methods of jacking, collection, processing, correction and rotation through axis deviation calculation, which greatly reduces the adjustment time of the lateral deviation correction of the steel box girder, thereby solving the problem that it is difficult to correct the deviation of curved steel box girders, especially small curved steel box girders that are more difficult to control, in time during jacking construction, and reducing the risk of small curved steel box girder bridge construction.

[0045] The construction method specifically includes the following steps:

[0046] S1, jacking preparation. In this embodiment, a multi-point walking jacking device is selected to perform jacking operation on a small curved steel box girder. Before the multi-point walking jacking construction of the girder body is performed, the relevant construction structure needs to be built on the construction site, which specifically includes the following steps:

[0047] S1010, segment assembly site construction, select and construct the segment assembly site according to the specific construction environment, and ensure the safety of construction while reducing the impact on existing roads.

[0048] S1020, small curve steel box girder setting.

[0049] S1030, erect temporary bridge piers.

[0050] S1040, installation of multi-point walking jacking equipment. Walking jacking equipment is a jacking equipment that integrates jacking, translation and lateral adjustment. It can realize the movement and adjustment of the steel box girder along the bridge direction, transverse to the bridge direction and vertically. Specifically, it uses the four steps of jacking, pushing, dropping and returning to jack up the steel box girder as a whole and then push it forward. After the steel box girder is placed on the temporary support pad of the bridge pier, the jacking cylinder retracts and restores, and the jacking process is continuously cycled to implement the equipment. The working process of the walking jacking equipment for small curved steel box girders is a prior art and will not be repeated here.

[0051] S1050, assembly of the tail end small curve steel box girder segment. At the built small curve steel box girder segment assembly site, the main beam is assembled according to the requirements of the construction design drawings.

[0052] S1060, set up a multi-point coordinate measuring device. In this embodiment, the multi-point coordinate measuring device includes a total station automatic observation station and a number of reflective stickers spaced apart on the side webs of the small curved steel box girder. The total station automatic observation station includes a total station. The multi-point coordinate measuring device uses the total station and the reflective stickers to monitor the real-time position of the beam during the jacking construction. The total station uses the reflective stickers to measure the distance and angle of the target object, which is a prior art and will not be described in detail here. Figure 2 As shown, in this embodiment, the reflective sticker is installed at every L / 8 position of the main beam of the small curved steel box girder, where L is the longitudinal length of the main beam of the small curved steel box girder. The total station automatic observation station is established by the rear intersection method, which solves the coordinates and elevation of the points to be measured by the triangle similarity principle and trigonometric functions, with an accuracy of up to millimeter level, and convenient data processing, which can save measurement time and meet the requirements of real-time and accurate monitoring of small curved steel box girders.

[0053] S2, data collection, after the jacking construction begins, the main beam axis deviation value and the beam body curve deviation angle of the curved steel box beam are obtained in real time based on the multi-point coordinate measuring device. The acquisition steps are as follows:

[0054] S2010, the multi-point walking jacking equipment works simultaneously to lift the small curved steel box girder as a whole and then push it longitudinally inside and outside synchronously, so that the main beam moves forward by a set distance as a whole and then falls back. In this embodiment, the set distance is l a , that is, under the control of the walking push device, the forward distance each time is l a The setting continues to carry out the jacking construction of small curve steel box girder.

[0055] S2020, the total station enters the prism-free mode, automatically searches for and sequentially measures the spatial position data of the reflective stickers on the current curved steel box girder, specifically: determines the three-dimensional coordinates of each reflective sticker in turn, and sends the spatial position data of the reflective stickers to the computer analysis system via wireless transmission in real time for data processing and analysis, to obtain the actual axis and curve data of the current beam.

[0056] S3, data processing, judging whether the main beam axis deviation value is greater than the preset deviation value, judging whether the beam curve deviation angle is greater than the preset deviation angle; if the main beam axis deviation value is less than or equal to the preset deviation value and the beam curve deviation angle is less than or equal to the preset deviation angle, then continue the jacking construction, and then through the control of the main beam axis deviation and beam curve deviation during the jacking construction, ensure that the jacking construction of the small curve steel box girder can be successfully completed according to the design requirements. The specific steps of data processing are as follows:

[0057] S3010, first, based on the multi-point coordinate measuring device, obtain the main beam axis data, and determine whether the main beam axis deviation value D is less than the preset deviation value [D] specified in the construction safety regulations under the current construction state. Figure 3 As shown, in this embodiment, D is the deviation distance in the radial direction between the actual position of the main beam axis and the designed position of the main beam axis, and in this embodiment, the reference position of D is selected as the tail end position of the main beam or the front end position of the main beam.

[0058] like Figure 1 As shown, if the main beam axis deviation value D is greater than the preset deviation value [D], enter S3020 and perform the axis correction method; if the main beam axis deviation value D is less than or equal to the preset deviation value [D], enter S3030 and perform the curve angle judgment step.

[0059] Combination of deviation correction method Figure 3 and Figure 4 The details are as follows:

[0060] S3020, the main beam axis deviation value D is greater than the preset deviation value [D], and the deviation correction method is started.

[0061] S3021, calculate the transverse correction distance and longitudinal correction distance required for the correction of the main beam axis. The calculation formulas for the transverse correction distance and longitudinal correction distance are:

[0062] l g =D·sin(α+β)

[0063] l h =-D·cos(α+β)

[0064] In the above formula: g is the lateral correction distance, l his the longitudinal correction distance, α is the angle between the longitudinal direction of the current walking jacking equipment and the x-axis of the plane coordinate system, and β is the angle between the radial direction between the actual axis of the main beam of the curved steel box girder and the design axis of the main beam and the x-axis of the plane coordinate system. It should be noted that the selection of the secondary plane coordinate system can be determined according to the actual construction situation, and the selection of the plane coordinate system does not affect the calculation results.

[0065] S3022, based on the obtained lateral correction distance and longitudinal correction distance, control all walking jacking equipment to carry out lateral and longitudinal jacking on the small curve steel box girder in the same direction and at the same distance, thereby completing the correction method and realizing the correction control of the small curve steel box girder.

[0066] At the same time, in order to further improve the accuracy of the control of the top-pushing construction of the small-curve steel beam, this embodiment further controls the actual position of the main beam curve and the designed position of the main beam curve.

[0067] The specific control steps are:

[0068] S3030, determining whether the beam curve deviation angle is greater than a preset deviation angle.

[0069] If the curve deviation angle of the beam body is less than or equal to the preset deviation angle, and the main beam axis deviation value is less than or equal to the preset deviation value, it means that the current advancement of the small curve steel box girder is within the design range, and the jacking construction can continue.

[0070] If the curve deviation angle of the beam body is greater than the preset deviation angle, it is necessary to adjust the angle of the small curve steel box girder through the rotation method.

[0071] Combination Figure 5 As shown in the figure: A represents the front end of the center axis of the curved steel box girder before pushing, C represents the end of the center axis of the curved steel box girder before pushing, A' represents the front end of the center axis of the curved steel box girder after pushing, C' represents the end of the center axis of the curved steel box girder after pushing, B' represents the front end of the center axis of the curved steel box girder before pushing After the curved steel box girder is pushed The intersection of B and B′ respectively corresponds to the axis before the curved steel box girder is pushed up. The position on the top, A″ is the Parallel arc (arc length and equal), and θ is the rotation angle.

[0072] Under the current construction state, calculate the actual axis of the beam at this time Design axis The angle γ between them is the curve deviation angle of the beam body. It is judged whether the curve deviation angle γ is greater than the preset deviation angle [γ] specified in the construction regulations.

[0073] Rotational method combined Figure 1 As shown, the specific steps include:

[0074] S3040, judging that the curve deviation angle γ is greater than the preset deviation angle [γ], the rotation method is started.

[0075] S3041, calculate the rotation angle, assuming The beam section is located at the assembly site, on the design axis The longitudinal push of the beam on b Then pan to Location, The beam segment moves to Design axis Parallel, ∠A′C′A″ is approximately equal to the rotation angle θ: The calculation formula for the rotation angle is:

[0076]

[0077] Where θ is the rotation angle, (x A ,y A ) is the plane coordinate at A, (x c ,y c ) is the plane coordinate at C, (x A′ ,y A′ ) is the plane coordinate at A′, (x C′ ,y C′ ) is the plane coordinate at C′, (x A″ ,y A″ ) is the plane coordinate at A″.

[0078] Furthermore, when the curve deviation angle γ is greater than the preset deviation angle [γ], it means that there is a deviation between the actual position of the default main beam axis and the designed position, that is, l b is not equal to 0, so based on the coordinates of the three points A, B, and C, the coordinate values ​​of A′, C′, and A″ are further calculated. The calculation formulas for the coordinate values ​​of A′, C′, and A″ are as follows:

[0079] x C′ =x C +l b ·cosα

[0080] y C′ =y C +l b ·sinα

[0081] x A″ =x C′ +(x A -x B )

[0082] y A″ =yC′ +(y A -y B )

[0083] x A′ =x A +l b ·cosα

[0084] y A′ =y A +l b ·sinα

[0085] In the formula, x B is the horizontal coordinate of point B, y B is the vertical coordinate of point B.

[0086] S3042, according to the rotation angle, use each walking type jacking equipment to perform proportional deviation correction at the same time, so that the curved steel box girder rotates around the tail of the beam body B' until it reaches Design the axis position and complete the process by rotation method.

[0087] The rotation method realizes a small rotation of the main beam around the tail by simultaneously correcting the rotation angle θ through the walking jacking equipment in different positions in proportion. By changing the direction of the axis, the main beam gradually approaches the plane line shape of the completed bridge, thereby improving the construction accuracy of the small curve steel box girder.

[0088] S4, judging whether the main beam is pushed to the designed position and whether the plane line shape of the main beam is the line shape of the completed bridge;

[0089] If the main beam reaches the designed position through jacking, the jacking construction is completed.

[0090] If it is determined that the main beam has not been pushed to the designed position, return to S3010 to continue monitoring and adjustment.

[0091] S5, beams are dropped, permanent supports are installed, and beams are connected.

[0092] S6, dismantle the jacking equipment and end the jacking construction.

[0093] Finally, it should be noted that during the jacking construction of the small curved steel box girder, it is necessary to assume that the plane shape of the main beam does not change, that is, the main beam as a whole is regarded as a rigid body, the plane line shape only translates and rotates, the steel box girder segments do not stretch or shrink, and the rotation angle between segments does not change. During the construction process, the longitudinal jacking direction and jacking speed of each walking jacking device should always remain the same, that is, the main beam only translates under the longitudinal jacking of multiple devices.

[0094] Based on the basic working principle of the total station, this scheme proposes a construction method that can automatically monitor the displacement of the beam body during jacking, which greatly saves the time required to adjust the beam body posture of the small curved steel box girder during the construction process and improves the efficiency of beam jacking. At the same time, based on the three basic construction methods of processing, deviation correction, and rotation, specific mathematical calculation models corresponding to the three basic construction methods are proposed. The calculation content is concise and effective, with high operability, and can effectively guide the jacking construction of curved steel box girders. In the jacking construction of curved steel box girders, the requirements for multi-point non-uniform speed synchronization of the multi-point walking jacking system during the curved jacking process are reduced, so that the longitudinal jacking speeds inside and outside the beam body are the same, reducing the control difficulty of jacking construction and greatly reducing the requirements for the multi-point walking jacking system.

[0095] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for jacking construction of a small curved steel box girder bridge capable of realizing automated monitoring, characterized in that: The following steps are involved: S1, jacking preparation, installation of jacking equipment for curved steel box girders, and setting of multi-point coordinate measuring devices; S2, collect data, start the jacking construction of the curved steel box girder, and obtain the main beam axis deviation value and beam body curve deviation angle of the curved steel box girder in real time based on the multi-point coordinate measuring device; S3, data processing, judging whether the main beam axis deviation value is greater than the preset deviation value, judging whether the beam curve deviation angle is greater than the preset deviation angle; if the main beam axis deviation value is less than or equal to the preset deviation value and the beam curve deviation angle is less than or equal to the preset deviation angle, the jacking construction continues; S4, judging whether the curved steel box girder is pushed to the designed position. If the curved steel box girder is pushed to the designed position, the pushing construction is completed.

2. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 1, characterized in that: In S3, if the deviation value of the main beam axis is greater than the preset deviation value, a deviation correction method is performed, and the deviation correction method includes the following steps: S3021, determine the transverse correction distance and longitudinal correction distance required for the main beam axis correction value. The calculation formulas for the transverse correction distance and longitudinal correction distance are: l g =D sin(α+β) l h =-D·cos(α+β) In the formula, l g is the lateral correction distance, l h is the longitudinal correction distance, D is the deviation value of the main beam axis, α is the angle between the longitudinal direction of the current jacking equipment and the x-axis of the plane coordinate system, and β is the angle between the radial direction between the actual axis and the design axis of the curved steel box girder and the x-axis of the plane coordinate system; S3022: Based on the obtained transverse correction distance and longitudinal correction distance, use the jacking equipment to carry out transverse jacking and longitudinal jacking of the curved steel box girder in the same direction and at the same distance as the transverse correction distance and longitudinal correction distance.

3. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 2, characterized in that: In S3, if the beam body curve deviation angle is greater than the preset deviation angle, a rotation method is performed, and the rotation method includes the following steps: S3041, determine the rotation angle, the calculation formula of the rotation angle is: Where, θ is the rotation angle; A represents the front end of the center axis of the curved steel box girder before pushing, (x A ,y A ) is the plane coordinate at A; C represents the end of the centerline of the curved steel box girder before pushing, (x c ,y c ) is the plane coordinate at C; A′ represents the front end of the center axis of the curved steel box girder after jacking, (x A′ ,y A′ ) is the plane coordinate at A′; C′ represents the end of the centerline of the curved steel box girder after jacking, (x C′ ,y C′ ) is the plane coordinate at C′; B corresponds to the position of the curved steel box girder at the axis A before jacking, and A″ is the coordinate of the plane passing through C′. Parallel arc (arc length and equal) endpoints, (x A″ ,y A″ ) is the plane coordinate at A″; S3042, according to the rotation angle, use the jacking equipment to simultaneously correct the various parts of the curved steel box girder in proportion, so that the curved steel box girder rotates around the tail B' point of the beam body until the main axis of the curved steel box girder Arrival at the design axis position, the rotation method is completed.

4. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 3 is characterized in that: In S3041, based on the coordinates of the three points A, B, and C, the coordinate values ​​of A′, C′, and A″ are further calculated. The calculation formulas for the coordinate values ​​of A′, C′, and A″ are as follows: x C′ =x C +l b cosα and C′ =and C +l b ·sinα x A′′ =x C′ +(x A -x B ) and A″ =and C′ +(and A -and B ) x A′ =x A +l b cosα and A′ =and A +l b ·sinα In the formula, x B is the horizontal coordinate of point B, y B is the vertical coordinate of point B.

5. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 4, characterized in that: The main beam axis deviation value is the radial deviation distance between the actual position of the curved steel box beam axis at the selected reference position and the designed position of the curved steel box beam axis, and the reference position is selected at the tail end position of the curved steel box beam or the front end position of the curved steel box beam.

6. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 5, characterized in that: The curve deviation angle of the beam body is the curve angle between the actual axis of the curved steel box girder and the design axis of the curved steel box girder.

7. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 6, characterized in that: In S1, the multi-point coordinate measuring device includes a total station automatic observation station and a plurality of reflective stickers arranged at intervals on the side webs of the curved steel box girder, and the total station automatic observation station is established by the rear intersection method.

8. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 7, characterized in that: In S1, the push preparation also includes the following steps: S1010, segment assembly site construction; S1020, curved steel box girder setting; S1030, erection of temporary bridge piers; S1040, installation of jacking equipment, where the jacking equipment is a multi-point walking jacking equipment; S1050, assembly of the tail end curved steel box girder segment, assemble the main beam in the built curved steel box girder segment assembly site according to the requirements of the construction design drawings.

9. The method for jacking construction of a small curved steel box girder bridge capable of realizing automatic monitoring according to claim 8, characterized in that: In S2, the following steps are also included: S2010, use multi-point walking type jacking equipment to jack up the curved steel box girder, control the curved steel box girder to move forward as a whole to a set distance and then fall back; S2020, the total station automatic observation station automatically searches for and measures the three-dimensional spatial coordinate data of the reflective stickers in sequence.

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