Method and system for tangential installation of main beam sections

Abstract

The present application relates to a method and system for tangential installation of a main beam section, and relates to the field of bridge construction control technology, including obtaining the measured elevations of various preset control points on an already erected beam section under a constant temperature environment; curve fitting and deriving the measured elevations to obtain the beam end tangent angle of the cantilever end of the already erected beam section; adjusting the angle of a laser transmitter fixed on the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation; when the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, adjusting the elevation of the front end of the beam section to be erected until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser transmitter, thereby achieving tangential installation between the beam section to be erected and the already erected beam section. The present application calculates the beam end tangent angle by a curve fitting method, and uses a laser method to ensure that the laser angle is always parallel to the beam end tangent angle, thereby achieving high-precision tangent installation.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction control, and in particular to a method and system for tangential installation of main beam sections. Background Art

[0002] Currently, cantilever construction has become the most common method for constructing long-span continuous beam bridges, continuous rigid frame bridges, and cable-stayed bridges due to its advantages such as cyclic operation, simple procedures, excellent process stability, and no impact on underbridge clearance. During cantilever construction, the effectiveness of controlling the alignment of the main beam directly impacts the smoothness of the bridge's alignment and, consequently, the smoothness of the finished bridge's alignment. Since the relative relationship between the main beam segments is fixed and difficult to change after they are connected and installed, each segment must be installed with no relative angles.

[0003] However, during the construction process, the structure is subject to various effects such as its own weight, ambient temperature, prestress (cable force), and temporary construction loads, resulting in the actual deformation of each beam segment becoming a curve. Therefore, to achieve smooth connection of the beam segments, the beam segment to be installed should be located on the tangent of the already erected beam segment, which is called tangent installation or stress-free installation. In related technologies, the deformation of the structure is often calculated using a finite element model, but the actual structural weight, stiffness, and structural temperature all have simulation errors compared to the theoretical values, resulting in a deviation between the deformation obtained by the structural finite element model and the actual deformation of the structure.

[0004] Therefore, among conventional construction control methods, the use of finite element calculation combined with on-site measurement to determine the installation elevation of the beam section to be erected has the following disadvantages: (1) There are differences in weight and structural stiffness between the actual structure and the finite element model, resulting in a difference between the installation elevation of the beam section to be erected determined by the finite element model and the actual value; (2) Since the main beam section is installed during the day, the ambient temperature during the day will continue to change, causing the internal temperature of the structure to change accordingly, so that the actual temperature of the structure cannot be determined, but the temperature effect has a great influence on the installation elevation of the beam section to be erected.

[0005] As can be seen, both of the aforementioned drawbacks result in relative angles between main beam segments. As bridge spans grow and the number of beam segments increases, the cumulative impact of these angles during installation can cause the completed bridge alignment to deviate from the designed alignment by tens of centimeters or even more, jeopardizing bridge and vehicle safety. Therefore, effectively achieving precise tangential installation of main beam segments to eliminate angles between segments is a pressing issue. Summary of the Invention

[0006] The present application provides a method and system for tangential installation of main beam sections to solve the problem in related technologies of relative angles between beam sections caused by the inability to achieve precise tangential installation of main beam sections.

[0007] In a first aspect, a method for tangential installation of a main beam segment is provided, comprising the following steps:

[0008] Under a constant temperature environment, obtain the measured elevation of each preset control point on the erected beam section;

[0009] Performing curve fitting and derivative on the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section;

[0010] Adjusting the angle of the laser emitter fixed on the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation;

[0011] When the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser transmitter, thereby realizing the tangent installation between the beam section to be erected and the erected beam section.

[0012] In some embodiments, performing curve fitting and derivative on the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section includes:

[0013] Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve;

[0014] The fitting curve is derived to obtain the beam end tangent angle of the cantilever end of the erected beam section.

[0015] In some embodiments, adjusting the angle of the laser emitter fixed to the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation includes:

[0016] A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end;

[0017] Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam;

[0018] The angle of the laser emitter fixed on the cantilever end is adjusted until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and the angle of the laser emitter is locked.

[0019] In some embodiments, the calculation of the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam includes:

[0020] Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is:

[0021] H=H1+h0+θL

[0022] Where H represents the preset elevation, H1 represents the measured elevation corresponding to the preset control point on the cantilever end, h0 represents the preset height between the laser emitter and the top surface of the main beam, θ represents the tangent angle of the beam end, and L represents the preset horizontal distance.

[0023] In some embodiments, before the step of obtaining the measured elevations of each preset control point on the erected beam section in a constant temperature environment, the method further includes:

[0024] A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

[0025] In a second aspect, a system for tangential installation of main beam segments is provided, comprising:

[0026] The measurement module is used to obtain the measured elevation of each preset control point on the erected beam section in a constant temperature environment;

[0027] a calculation module for performing curve fitting and derivative on the measured elevation to obtain a beam end tangent angle of the cantilever end of the erected beam section;

[0028] An adjustment module is used to adjust the angle of the laser emitter fixed on the cantilever end based on the tangent angle of the beam end so that the elevation of the laser point reaches a preset elevation; when the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser emitter, thereby realizing the tangent installation between the beam section to be erected and the erected beam section.

[0029] In some embodiments, the calculation module is specifically configured to:

[0030] Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve;

[0031] The fitting curve is derived to obtain the beam end tangent angle of the cantilever end of the erected beam section.

[0032] In some embodiments, the adjustment module is specifically configured to:

[0033] A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end;

[0034] Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam;

[0035] The angle of the laser emitter fixed on the cantilever end is adjusted until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and the angle of the laser emitter is locked.

[0036] In some embodiments, the adjustment module is further configured to:

[0037] Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is:

[0038] H=H1+h0+θL

[0039] Where H represents the preset elevation, H1 represents the measured elevation corresponding to the preset control point on the cantilever end, h0 represents the preset height between the laser emitter and the top surface of the main beam, θ represents the tangent angle of the beam end, and L represents the preset horizontal distance.

[0040] In some embodiments, the system further includes a point distribution module, which is configured to:

[0041] A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

[0042] The present application provides a method and system for tangential installation of a main beam section, comprising: obtaining the measured elevations of each preset control point on the erected beam section in a constant temperature environment; performing curve fitting and differentiation on the measured elevations to obtain the beam end tangent angle of the cantilever end of the erected beam section; adjusting the angle of a laser emitter fixed on the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation; when the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, adjusting the elevation of the front end of the beam section to be erected until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser emitter, thereby realizing tangential installation between the beam section to be erected and the erected beam section. This application calculates the tangent angle of the beam end through a curve fitting method, and adopts a laser method to ensure that the laser angle is always parallel to the tangent angle of the beam end, so as to effectively filter out the influence of various errors on the installation elevation, realize high-precision tangent installation, eliminate the relative angles between beam sections, and facilitate the linear control of large-span bridge construction; in addition, this application can accurately determine the tangent angle through a single constant temperature measurement, without the need for finite element calculation, thereby effectively improving the efficiency of tangent installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 A schematic flow chart of a method for tangential installation of main beam sections provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of selecting preset control points provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of determining the tangent direction of the cantilever end using a laser method according to an embodiment of the present application;

[0047] Figure 4 A schematic diagram of using a laser method to determine the installation elevation of the beam section to be erected provided in an embodiment of the present application;

[0048] Figure 5 A structural schematic diagram of a system for tangential installation of main beam sections provided in an embodiment of the present application.

[0049] In the figure: 1-beam section with erection, 2-beam section to be erected, 3-crane, 4-laser transmitter, 5-identification plate, 6-laser receiver. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] The embodiments of the present application provide a method and system for tangential installation of main beam sections, which can solve the problem in related technologies of relative angles between beam sections caused by the inability to achieve precise tangential installation of main beam sections.

[0052] Figure 1 A method for tangential installation of a main beam segment provided in an embodiment of the present application includes the following steps:

[0053] Step S10: Under a constant temperature environment, obtaining the measured elevations of each preset control point on the erected beam section;

[0054] Exemplarily, in this embodiment, in a constant temperature environment, before the installation of the beam section begins, the elevations of each preset control point on the beam section that has been erected are measured to obtain the actual measured elevations {H} corresponding to each preset control point.

[0055] Furthermore, before the step of obtaining the measured elevations of each preset control point on the erected beam section in a constant temperature environment, the method further includes:

[0056] A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

[0057] For example, see Figure 2 As shown, for a cantilever construction bridge, before installing a certain beam section 2 to be erected, n preset control points for measuring elevation are selected in the erected beam section 1 (for example, Figure 2 The preset control points should be selected at the main beam nodes and sequentially from the cantilever end. It should be noted that the number of preset control points n should preferably be no less than 4.

[0058] Step S20: performing curve fitting and derivative on the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section;

[0059] For example, in this embodiment, after obtaining the measured elevations of each preset control point on the erected beam segment, a spline curve fitting method is used to perform curve fitting and derivative on the measured elevations {H} to calculate the beam end tangent angle θ at the cantilever end of the erected beam segment. It should be noted that if the stress-free angle of the beam segment needs to be corrected during actual construction, the correction amount can be simply added to the tangent angle θ calculated in this embodiment.

[0060] Furthermore, the curve fitting and derivation of the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section includes:

[0061] Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve;

[0062] The fitting curve is derived to obtain the beam end tangent angle of the cantilever end of the erected beam section.

[0063] For example, in this embodiment, the measured elevation is fitted by a cubic spline curve fitting method to obtain a fitting curve; and the fitting curve is then differentiated to obtain the beam end tangent angle θ of the cantilever end of the erected beam section.

[0064] Among them, the specific method of performing cubic spline curve fitting is:

[0065] (1) Assume that there are n preset control points on the erected beam segment, and the beam is divided into n-1 beam segments, whose lengths are L1, L2, ..., L n-1 ; Then, cubic spline curve fitting is used, and the displacement curve of the i-th beam segment is:

[0066] ω i (x) = y i +A i (xx i )+B i (xx i ) 2 +C i (xx i ) 3 x∈[x i ,x i+1 ],i=1,2,...n-1

[0067] Where x i 、y i is the measured position and elevation of the i-th node, A i 、B i and C i is the undetermined coefficient.

[0068] (2) According to the continuous properties of the function value, first-order derivative and second-order derivative of the cubic spline curve at the node, the coefficient A is obtained.i 、B i and C i and let Δy i =y i+1 -y i , we get the following recursive equation:

[0069]

[0070] (3) Considering the boundary condition ω″(x1)=ω″(x n )=0, we can get n-1 equations and solve n-1 unknowns, which can be organized into a matrix equation:

[0071]

[0072] According to the above matrix equation, we can solve A i 、B i and C i , thus obtaining the spline curve expression of the displacement of each beam segment, and then taking the derivative to obtain the tangent angle of the beam end.

[0073] Step S30: adjusting the angle of the laser emitter fixed on the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation;

[0074] For example, it is understandable that in a constant temperature environment, the tangent angle θ at the beam end is very small, making it difficult to use directly; therefore, this embodiment will achieve accurate determination of the tangent angle by fine-tuning the laser emission angle and thus adjusting the laser point elevation, that is, adjusting the angle of the laser emitter 4 pre-fixed on the cantilever end through the tangent angle of the beam end. When the elevation of the laser point reaches the preset elevation, there is no need to adjust it, and the angle of the laser emitter 4 can be locked.

[0075] Furthermore, the angle of the laser emitter fixed on the cantilever end is adjusted based on the tangent angle of the beam end so that the elevation of the laser point reaches a preset elevation, including:

[0076] A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end;

[0077] Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam;

[0078] The angle of the laser emitter fixed on the cantilever end is adjusted until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and the angle of the laser emitter is locked.

[0079] Specifically, the preset elevation is calculated based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam, including:

[0080] Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is:

[0081] H=H1+h0+θL

[0082] Where H represents the preset elevation, H1 represents the measured elevation corresponding to the preset control point on the cantilever end, h0 represents the preset height between the laser emitter and the top surface of the main beam, θ represents the tangent angle of the beam end, and L represents the preset horizontal distance.

[0083] For example, in this embodiment, before the installation of the beam section 2 to be erected begins, an identification plate 5 is hung at the front end of the main beam cantilever construction by a crane 3, so that the distance between the identification plate 5 and the front end of the cantilever end is equal to the preset horizontal distance L; it should be noted that the specific value of the preset horizontal distance can be determined according to actual needs and is not limited here.

[0084] Then, an angle-adjustable laser emitter 4 is set on the cantilever end of the main beam, and the preset height between the laser emitter 4 and the top surface of the main beam is h0; then the laser emitter 4 emits laser toward the identification plate 5, so that a laser dot appears on the identification plate 5.

[0085] At the same time, the preset elevation corresponding to the laser point on the identification plate 5 is determined by the following first calculation formula, that is, the measured elevation H1 corresponding to the preset control point on the cantilever end, the preset horizontal distance L, the beam end tangent angle θ, and the preset height h0 between the laser emitter 4 and the top surface of the main beam are substituted into the following first calculation formula to obtain the preset elevation H:

[0086] H=H1+h0+θL

[0087] After obtaining the preset elevation H corresponding to the laser point on the identification plate 5, the angle of the laser emitter 4 on the cantilever end is adjusted. During the adjustment process, the elevation of the laser point on the identification plate 5 is continuously measured. When the elevation of the laser point on the identification plate 5 reaches the preset elevation H, the angle of the laser emitter 4 will no longer be adjusted and the angle of the laser emitter 4 will be directly locked.

[0088] Step S40: When the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser transmitter, thereby realizing the tangent installation between the beam section to be erected and the erected beam section.

[0089] As an example, in this embodiment, the installation of the beam section 2 to be erected is carried out in any environment. Before installing the beam section 2 to be erected, a laser receiver 6 needs to be set at the front end of the beam section 2 to be erected. The height of the laser receiver 6 is the same as the height h0 of the laser transmitter 4, and then the installation of the beam section 2 to be erected is carried out. Specifically, the beam section 2 to be erected is lifted by the crane 3. First, the measured elevation corresponding to the preset control point on the cantilever end and the rear end of the beam section 2 to be erected is adjusted to be consistent; secondly, the elevation of the front end of the beam section 2 to be erected is adjusted until the laser receiver 6 can receive the laser emitted by the laser transmitter 4. At this time, the beam section 2 to be erected and the erected beam section 1 have achieved precise tangent installation, and the beam sections are connected.

[0090] It can be understood that the stress-free angle of a structural component unit, like the structural density, is an inherent property of the component unit and does not change due to changes in the external temperature environment or structural load. Therefore, this embodiment, based on the structural deformation, realizes the precise calculation of the stress-free angle of the component unit through elevation measurement, and reflects the theoretical calculation to the actual structure through the mutual cooperation of the laser transmitter and the laser receiver. During the installation of the beam section, although the external load and temperature will change, the stress angles matched between the beam sections will follow the changes, but the stress-free angle is fixed. Therefore, this embodiment can actively filter out the influence of load and temperature changes on the installation elevation of the beam section.

[0091] It can be seen that compared with the conventional method using finite element calculation, the influence of errors in beam weight, stiffness, and ambient temperature on the installation elevation of the beam segment to be erected cannot be considered, resulting in inevitable deviations in its application, which in turn leads to relative angles between beam segments. However, this embodiment proposes a method for calculating the tangent angle of the beam end using spline curve fitting. This method has high curve fitting accuracy, and the use of a laser method can ensure that the laser angle is always parallel to the tangent angle of the beam end, thereby effectively filtering out the influence of various errors on the installation elevation, achieving high-precision tangent installation, eliminating angles between beam ends, and ensuring that the bridge alignment after construction is completely consistent with the designed alignment, which is beneficial for the alignment control of large-span bridge construction and ensures bridge safety and driving safety.

[0092] In addition, the method proposed in this embodiment does not require finite element calculation, and the tangent angle can be accurately determined through a single constant temperature measurement, effectively improving the efficiency of tangent installation; and the set of devices proposed in this embodiment that combines a laser transmitter, a laser receiver and an identification plate has the advantages of good on-site feasibility, easy implementation and strong reusability, which can save the time of transmitting data back and forth on-site and is beneficial to the operation of on-site workers.

[0093] The following combination Figures 2 to 4 The principle and process of this embodiment are explained by taking a double-tower, three-span steel box girder cable-stayed bridge with a main span of 720m as an example.

[0094] 1. When erecting a certain beam section 2, the construction phase and the preset control points are selected as follows: Figure 2 The node spacing on the main beam is 14m, and four measuring points (i.e., four preset control points) are selected, with mileage coordinates of {x} = {0, -14, -28, -42}, in meters. The same applies below.

[0095] 2. Under constant temperature environment, before the installation of beam section 2 begins, first use Figure 3 In the method described in the embodiment, an identification plate 5 is hung on the front end of the main beam cantilever construction by a crane 3, and an angle-adjustable laser emitter 4 is set on the main beam cantilever end, the height h0 of the laser emitter 4 is 35 mm, and the horizontal distance between the identification plate 5 and the laser emitter 4 (i.e., the front end of the cantilever end) is L = 8 m; the laser generated by the laser emitter 4 is emitted on the identification plate 5 to generate a laser point; the measured elevations {H} = {0.320, 0.271, 0.226, 0.186} of the four measuring points are measured; and the spline curve fitting method proposed in this embodiment is used to perform curve fitting on the measured elevations {H} and to obtain the derivative, thereby obtaining the beam end tangent angle θ = 0.00363.

[0096] Among them, the method of cubic spline curve fitting is:

[0097] (1) Based on the four preset control points, the beam is divided into three beam segments, each with a length of 14 m. Using cubic spline curve fitting, the displacement curve of the i-th beam segment is:

[0098] ω i (x) = y i +A i (xx i )+B i (xx i ) 2 +C i (xx i ) 3 x∈[x i ,x i+1 ],i=1,2,3,4

[0099] Where x i 、y i are the measured position and measured elevation of the i-th node, A i 、B i and C i is the undetermined coefficient.

[0100] (2) According to the property that the function value, first-order derivative, and second-order derivative of the cubic spline curve at the node are continuous, let Δy i =y i+1 -y i , and considering the boundary condition ω″(x1)=ω″(x n )=0, then we can get the matrix equation:

[0101]

[0102] According to the above matrix equation, the coefficient A can be solved i 、B i and C i , thus obtaining the entire piecewise cubic curve expression. Substituting the coefficients into the piecewise cubic curve expression, the cubic curve expression corresponding to the cantilever end can be obtained as:

[0103] ω1(x)=y1+1.122×10 -5 (x-x1) 2 +1.633×10 -5 (x-x1) 3

[0104] By deriving the cubic curve expression corresponding to the cantilever end, the beam end tangent angle θ = ω′1(x) = 0.00363 can be obtained.

[0105] 3. In a constant temperature environment, fine-tune the laser emission angle of the laser transmitter 4 until the laser point elevation on the sign plate 5 is measured to be:

[0106] H=H1+h0+θL=0.320+0.035+0.00363×8=0.384m

[0107] At this time, locking the laser emission angle can ensure that the laser angle is consistent with the tangent angle of the beam end.

[0108] 4. After determining the laser emission angle of the laser transmitter, keep it unchanged; and before installing the beam section 2 under any environment, if Figure 4As shown, a laser receiver 6 is set at the front end of the beam section 2 to be erected, and the height of the laser receiver 6 from the top surface of the main beam is also h0 = 35 mm; then the beam section 2 to be erected is lifted by the crane 3, and then the elevation corresponding to the rear end of the beam section 2 to be erected and the preset control point on the cantilever end are adjusted to be consistent; then the front end elevation of the beam section 2 to be erected is adjusted until the laser receiver 6 can receive the laser emitted by the laser transmitter 4. At this time, the beam section 2 to be erected and the erected beam section 1 have achieved precise tangent installation, and the beam sections are connected.

[0109] In summary, this embodiment achieves the determination of the tangent angle of the beam end through a single measurement under a constant temperature state using laser positioning. Thereafter, even if the structure is subjected to any load or temperature, the laser direction always remains parallel to the tangent direction of the beam end, which can effectively filter out the influence of various errors and ensure the tangent installation of the beam section. Compared with conventional methods, this embodiment can achieve accurate calculation of the tangent angle of the beam end and eliminate the influence of various errors on the installation elevation of the beam section to be erected. In addition, the device proposed in this embodiment that integrates a laser transmitter, a laser receiver, and an identification plate has the advantages of good on-site feasibility, easy implementation, and strong reusability, which is convenient for on-site workers to operate.

[0110] See also Figure 5 As shown, the embodiment of the present application further provides a system for tangential installation of main beam segments, comprising:

[0111] The measurement module is used to obtain the measured elevation of each preset control point on the erected beam section in a constant temperature environment;

[0112] a calculation module for performing curve fitting and derivative on the measured elevation to obtain a beam end tangent angle of the cantilever end of the erected beam section;

[0113] An adjustment module is used to adjust the angle of the laser emitter fixed on the cantilever end based on the tangent angle of the beam end so that the elevation of the laser point reaches a preset elevation; when the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser emitter, thereby realizing the tangent installation between the beam section to be erected and the erected beam section.

[0114] Furthermore, the calculation module is specifically used to:

[0115] Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve;

[0116] The fitting curve is derived to obtain the beam end tangent angle of the cantilever end of the erected beam section.

[0117] Furthermore, the adjustment module is specifically used to:

[0118] A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end;

[0119] Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam;

[0120] The angle of the laser emitter fixed on the cantilever end is adjusted until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and the angle of the laser emitter is locked.

[0121] Furthermore, the adjustment module is further configured to:

[0122] Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is:

[0123] H=H1+h0+θL

[0124] Where H represents the preset elevation, H1 represents the measured elevation corresponding to the preset control point on the cantilever end, h0 represents the preset height between the laser emitter and the top surface of the main beam, θ represents the tangent angle of the beam end, and L represents the preset horizontal distance.

[0125] Furthermore, the system also includes a point distribution module, which is used to:

[0126] A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

[0127] It should be noted that technical personnel in this field can clearly understand that for the convenience and conciseness of description, the specific working process of the system and each module described above can refer to the corresponding process in the aforementioned main beam section tangent installation method embodiment, and will not be repeated here.

[0128] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0129] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0130] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for tangential installation of main beam sections, characterized in that: The following steps are involved: Under a constant temperature environment, obtain the measured elevation of each preset control point on the erected beam section; Performing curve fitting and derivative on the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section; Adjusting the angle of the laser emitter fixed on the cantilever end based on the beam end tangent angle so that the elevation of the laser point reaches a preset elevation; When the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser transmitter, thereby realizing the tangential installation between the beam section to be erected and the erected beam section; The curve fitting and derivation of the measured elevation to obtain the beam end tangent angle of the cantilever end of the erected beam section includes: Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve; Derivative the fitting curve to obtain the beam end tangent angle of the cantilever end of the erected beam section; The adjusting the angle of the laser emitter fixed on the cantilever end based on the tangent angle of the beam end so that the elevation of the laser point reaches a preset elevation includes: A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end; Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam; Adjusting the angle of the laser emitter fixed on the cantilever end until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and locking the angle of the laser emitter; The preset elevation is calculated based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam, including: Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is: Where, H Indicates the preset elevation. Indicates the measured elevation corresponding to the preset control point on the cantilever end. Indicates the preset height between the laser transmitter and the top surface of the main beam. θ represents the tangent angle at the beam end, L Indicates the preset horizontal distance.

2. The method for tangential installation of main beam sections according to claim 1, characterized in that: Before the step of obtaining the measured elevations of each preset control point on the erected beam section in a constant temperature environment, the method further includes: A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

3. A system for tangential installation of main beam sections, characterized in that: include: The measurement module is used to obtain the measured elevation of each preset control point on the erected beam section in a constant temperature environment; a calculation module for performing curve fitting and derivative on the measured elevation to obtain a beam end tangent angle of the cantilever end of the erected beam section; An adjustment module is used to adjust the angle of the laser transmitter fixed on the cantilever end based on the tangent angle of the beam end so that the elevation of the laser point reaches a preset elevation; when the elevation of the rear end of the beam section to be erected is adjusted to be consistent with the measured elevation corresponding to the preset control point on the cantilever end, the elevation of the front end of the beam section to be erected is adjusted until the laser receiver fixed on the beam section to be erected receives the laser emitted by the laser transmitter, thereby realizing the tangent installation between the beam section to be erected and the erected beam section; The calculation module is specifically used for: Performing cubic spline curve fitting on the measured elevation to obtain a fitting curve; Derivative the fitting curve to obtain the beam end tangent angle of the cantilever end of the erected beam section; The adjustment module is specifically used for: A sign board is hung by a crane at a preset horizontal distance from the front end of the cantilever end; Calculate the preset elevation based on the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam; Adjusting the angle of the laser emitter fixed on the cantilever end until the elevation of the laser emitted by the laser emitter on the identification plate reaches a preset elevation, and locking the angle of the laser emitter; The adjustment module is further specifically configured to: Substitute the measured elevation corresponding to the preset control point on the cantilever end, the preset horizontal distance, the beam end tangent angle, and the preset height between the laser emitter and the top surface of the main beam into a first calculation formula to obtain the preset elevation. The first calculation formula is: Where H represents the preset elevation, Indicates the measured elevation corresponding to the preset control point on the cantilever end. Indicates the preset height between the laser transmitter and the top surface of the main beam. θ represents the tangent angle of the beam end, and L represents the preset horizontal distance.

4. The system for tangential installation of main beam sections according to claim 3, characterized in that: The system further includes a point distribution module, which is used to: A plurality of preset control points are fixedly set on the erected beam section, and the preset control points are set at the main beam nodes.

Images