Method for measuring and adjusting deformation of steel structure truss under gravity sinking

Abstract

The application provides a steel structure truss gravity sinking deformation measurement and adjustment method, comprising: setting a fixed reference point on the site according to a theoretical value; performing first measurement on a plurality of top end reference points of an azimuth rotating platform relative to the fixed reference point through a total station, to obtain a first vertical height difference peak-to-peak value; when the first vertical height difference peak-to-peak value is not within a first preset range, adjusting the azimuth rotating platform to control the first vertical height difference peak-to-peak value within the first preset range; installing a wheel rail system on the bottom side of the azimuth rotating platform; performing second measurement to obtain a second vertical height difference peak-to-peak value; when the second vertical height difference peak-to-peak value is not within a second preset range, installing a second support tool jacking to control the second vertical height difference peak-to-peak value within the second preset range; measuring third height difference data to obtain a plurality of first height difference values; processing a plurality of transition beam columns according to the plurality of first height difference values respectively; and installing the plurality of transition beam columns on the plurality of top end reference points.

Description

Technical Field

[0001] This invention relates to the field of installation technology for fixed station radar azimuth adjustment platforms, and in particular to a method for measuring and adjusting the deformation of a steel truss under gravity. Background Technology

[0002] The azimuth adjustment platform of a large fixed-station radar consists of a steel truss structure and a wheel-rail system. It serves as the load-bearing foundation for the radar equipment, forms the installation benchmark for the radar antenna back frame steel structure, and realizes functions such as mechanical adjustment of the radar array's azimuth pointing, azimuth rotation centering, and resistance to wind load overturning.

[0003] During the construction of the azimuth-turning platform's steel structure, pre-installation support fixtures are erected. The steel truss of the azimuth-turning platform is divided into multiple pre-assembled hoisting modules, which are hoisted and secured in stages and sections. Then, the support fixtures are removed, and the wheel-rail system is test-rotated. At this point, the steel truss of the azimuth-turning platform experiences weight-induced sinking, and the top surface levelness deteriorates. After the azimuth-turning platform's steel structure is completed, an antenna back frame will be erected on top. At this stage, the installation interfaces need to be measured and adjusted to ensure the antenna back frame has a good installation reference.

[0004] Traditional methods for measuring and adjusting the deformation of steel truss structures under gravity involve using a string line with adjusting shims, which suffers from poor accuracy. Furthermore, in the installation of large radar systems, the effect of gravity sagging can be considered in advance by designing the truss structure as a pre-arched structure, which forms a horizontal plane after gravity settlement. However, this method results in irregular angles at the joint surfaces of structural components, making the design and manufacturing process complex. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for measuring and adjusting the deformation of steel truss under gravity, which is in line with the shortcomings of the prior art.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for measuring and adjusting the gravitational settlement deformation of a steel structure truss, comprising:

[0007] S1. Set up the first support fixture for erecting the azimuth-shifting platform at the site and begin building the azimuth-shifting platform.

[0008] S2. Establish fixed reference points at the site based on theoretical values;

[0009] S3. During the construction of the azimuth adjustment platform, the first elevation difference data of multiple top reference points of the azimuth adjustment platform relative to the fixed reference point is measured at least once using a total station to obtain the first vertical elevation difference peak value.

[0010] S4. Determine whether the peak value of the first vertical height difference peak is within the first preset range;

[0011] S5, when the first vertical difference peak value is not in the first preset range, adjusting the azimuth turning platform to control the first vertical difference peak value in the first preset range, and completing the azimuth turning platform erection work;

[0012] S6, installing a wheel rail system on the bottom end of the azimuth turning platform, removing the first support tool, and testing the wheel rail system;

[0013] S7, performing at least one second measurement on the second difference data of the plurality of top end reference points of the azimuth turning platform relative to the fixed reference point through a total station, to obtain a second vertical difference peak value;

[0014] S8, judging whether the second vertical difference peak value is in a second preset range;

[0015] S9, when the second vertical difference peak value is not in the second preset range, installing a plurality of second support tools with a jacking function in the middle of the bottom end of the azimuth turning platform;

[0016] S10, jacking the azimuth turning platform through the plurality of second support tools to control the second vertical difference peak value in the second preset range;

[0017] S11, measuring third difference data of the plurality of top end reference points of the azimuth turning platform relative to the fixed reference point respectively, to obtain a plurality of first difference values;

[0018] S12, according to the plurality of first difference values respectively, processing a plurality of transition beam columns one by one;

[0019] S13, installing the plurality of transition beam columns one by one on the plurality of top end reference points of the azimuth turning platform.

[0020] The beneficial effects of the technical scheme of the present application are: measuring each top surface installation interface reference point with a total station, and the measurement data of each point and the absolute difference of the fixed reference point can reflect the levelness and the change amount in the erection process, the preset transition beam column between the azimuth turning platform and the antenna back frame, and the position and height of the transition beam column are adjusted through the measurement data on site, so that the top surface of the transition beam column meets the precision requirements. Through measurement and adjustment, the azimuth turning platform is successfully erected and a high-precision levelness reference is realized. The setting of the second support tool makes the load shared by the second support tool during the erection of the antenna back frame, resists sinking, and ensures a small overall sinking amount. After the additional support of the azimuth turning platform is jacked up, the transition beam column is processed according to the measurement results, the difference is adjusted and offset, and the transition beam column is welded on the top deck of the azimuth turning platform on site. The problems of large error of the traditional wire pulling method and large design and production difficulty of the pre-arch method are solved.

[0021] Further, step S13 further comprises:

[0022] S14, respectively measuring fourth height difference data of the top end of the plurality of transition beam columns relative to the fixed reference point, to obtain a plurality of second height difference values;

[0023] S15, respectively processing a plurality of shims according to the plurality of second height difference values;

[0024] S16, respectively installing the plurality of shims on the plurality of transition beam columns;

[0025] S17, installing an antenna back frame on the top end of the azimuth rotation platform;

[0026] S18, disassembling the second support tool.

[0027] The beneficial effects of the above further technical solutions are: using a level, a ruler, and a tool to mark and position the transition beam column and measure the height difference. The shims are used to further adjust the top surface of the transition beam column, and finally a better installation reference for the antenna back frame bottom beam joint is obtained.

[0028] Further, in step S16, the top end of the transition beam column is provided with a top end flange, and the shims are installed on the top end flange of the transition beam column.

[0029] The beneficial effects of the above further technical solutions are: facilitating the installation and maintenance of the shims and the antenna back frame, and improving work efficiency.

[0030] Further, in step S17, the bottom end of the antenna back frame is provided with a bottom end flange, the antenna back frame is installed on the top end flange at the top end of the azimuth rotation platform through the bottom end flange, and the shims are located between the top end flange and the bottom end flange.

[0031] The beneficial effects of the above further technical solutions are: facilitating the installation and maintenance of the shims and the antenna back frame, and improving work efficiency.

[0032] Further, step S1 further comprises:

[0033] S111, setting a plurality of top end reference points on the mounting surface of the azimuth rotation platform at the top end and the antenna back frame;

[0034] S112, producing and pre-assembling the azimuth rotation platform with the plurality of top end reference points as a reference;

[0035] S113, measuring the top end reference points of the pre-assembled azimuth rotation platform by a total station instrument to obtain first position data and fifth height difference data of the pre-assembled azimuth rotation platform, wherein the fifth height difference data is a theoretical value.

[0036] The beneficial effects of the further technical solutions are that the reference points are arranged on the mounting surface of the top of the azimuth turning platform and the antenna back frame, the positions and the levelness of the reference points are guaranteed in the production welding and pre-assembly, and the precision is improved.

[0037] Further, in step S13, the plurality of transition beam columns are installed one by one at a plurality of interface positions of the top end of the azimuth turning platform and the antenna back frame, wherein the top end reference point is the interface center.

[0038] The beneficial effects of the further technical solutions are that the reference points are arranged on the mounting surface of the top of the azimuth turning platform and the antenna back frame, the positions and the levelness of the reference points are guaranteed in the production welding and pre-assembly, and the precision is improved.

[0039] Further, the second support tooling includes a support and a jack, and the jack is installed on the top of the support.

[0040] The beneficial effects of the further technical solutions are that the additional support is provided for the azimuth turning platform before the antenna back frame is hoisted, the jack is used to support and lift the top, and the top flatness is adjusted, so that the load is shared by the second support tooling during the construction of the antenna back frame, the sinking is resisted, and the overall sinking amount is small.

[0041] Further, the support is an I-beam, and a steel plate is installed at the top end of the jack.

[0042] The beneficial effects of the further technical solutions are that the support is an I-beam, the load strength of the support is improved, the contact points are dispersed by the steel plate, the pressure is concentrated, and the stability and reliability of the support tooling are improved.

[0043] Further, the plurality of second support toolings are arranged in a ring.

[0044] The beneficial effects of the further technical solutions are that the stable support structure of the azimuth turning platform is formed, and the load strength is improved.

[0045] Further, the wheel rail system is a plurality of roller support mechanisms.

[0046] The beneficial effects of the further technical solutions are that the movement of the azimuth turning platform is facilitated.

[0047] The advantages of the additional aspects of the present application will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The schematic flowchart of the measurement and adjustment method of the steel structure truss gravity sinking deformation provided by the embodiment of the present application is shown.

[0049] Figure 2 Fig. 1 is a structural schematic diagram of a fixed station radar according to an embodiment of the present application.

[0050] Figure 3 Fig. 2 is another structural schematic diagram of a fixed station radar according to an embodiment of the present application.

[0051] Figure 4 Fig. 3 is a structural schematic diagram of an azimuth rotation platform according to an embodiment of the present application.

[0052] Figure 5 Fig. 4 is a structural schematic diagram of an azimuth rotation platform with a top reference point according to an embodiment of the present application.

[0053] Figure 6 Fig. 5 is a structural schematic diagram of an azimuth rotation platform with a support point according to an embodiment of the present application.

[0054] Brief Description of the Drawings: 1, azimuth rotation platform; 2, antenna back frame; 3, wheel rail system; 4, antenna array surface; 5, skeleton; 6, emergency toilet; 7, top ladder; 8, external section transition passage; 9, external hanging staircase; 10, elevator shaft; 11, radar control room; 12, internal section transition passage; 13, maintenance platform; 14, liquid cooling equipment room; 15, rotation control room; 16, electronic equipment room; 17, support point; 18, top reference point. DETAILED DESCRIPTION

[0055] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0056] As shown in Figure 1 Fig. 1, an embodiment of the present application provides a measurement and adjustment method for steel structure truss gravity subsidence deformation, comprising:

[0057] S1, setting a first support tool for erecting an azimuth rotation platform at a site, and starting to build the azimuth rotation platform;

[0058] S2, setting a fixed reference point at the site according to a theoretical value;

[0059] S3, during the process of building the azimuth rotation platform, performing at least one first measurement on first vertical difference data of a plurality of top reference points of the azimuth rotation platform relative to the fixed reference point by a total station, to obtain a first vertical difference peak-to-peak value;

[0060] S4, judging whether the first vertical difference peak-to-peak value is within a first preset range;

[0061] S5, when the first vertical height difference peak value is not in the first preset range, adjusting the azimuth rotation platform, controlling the first vertical height difference peak value in the first preset range, completing the azimuth rotation platform erection work;

[0062] S6, installing a wheel rail system on the bottom end of the azimuth rotation platform, removing the first support tooling, and testing the wheel rail system;

[0063] S7, performing at least one second measurement on the second height difference data of the plurality of top end reference points of the azimuth rotation platform relative to the fixed reference point through a total station, obtaining a second vertical height difference peak value;

[0064] S8, judging whether the second vertical height difference peak value is in a second preset range;

[0065] S9, when the second vertical height difference peak value is not in the second preset range, installing a plurality of second support toolings with a jacking function in the middle of the bottom end of the azimuth rotation platform;

[0066] S10, jacking the azimuth rotation platform through the plurality of second support toolings, so that the second vertical height difference peak value is controlled in the second preset range;

[0067] S11, measuring third height difference data of the plurality of top end reference points of the azimuth rotation platform relative to the fixed reference point respectively, obtaining a plurality of first height difference values;

[0068] S12, according to the plurality of first height difference values respectively, processing a plurality of transition beam columns one by one;

[0069] S13, installing the plurality of transition beam columns one by one on the plurality of top end reference points of the azimuth rotation platform.

[0070] The beneficial effects of the technical scheme of the present application are: measuring each top surface installation interface reference point by a total station, and the measurement data of each point and the absolute height difference of the fixed reference point can reflect the levelness and the change amount in the erection process, the preset transition beam column between the azimuth rotation platform and the antenna back frame is adjusted in position and height through the measurement data on site, so that the top surface of the transition beam column meets the accuracy requirements. Through measurement and adjustment, the azimuth rotation platform is successfully erected and a high-precision levelness reference is realized. The setting of the second support tooling makes the load shared by the second support tooling during the erection of the antenna back frame, resists sinking, and ensures a small overall sinking amount. After the additional support of the azimuth rotation platform is jacked up, the transition beam column is processed according to the measurement results, the height difference is adjusted and offset, and the transition beam column is welded on the top deck of the azimuth rotation platform on site. The problems of large error of the traditional wire pulling method and large design and production difficulty of the pre-arch method are solved.

[0071] In which, 1 reference point can be established in the center of each set of installation interface. The three-dimensional coordinates of each reference point are measured to obtain the levelness data and the positional deviation data on the horizontal plane.

[0072] As shown in Figure 2 and Figure 3 Large fixed station radar includes azimuth rotation platform 1, antenna back frame 2, wheel rail system 3 and antenna array surface 4, the antenna back frame 2 is installed on the top of the azimuth rotation platform 1, the antenna array surface 4 is installed on one side of the antenna back frame 2, and the wheel rail system 3 is installed on the bottom of the azimuth rotation platform 1.

[0073] As shown in Figure 4 The azimuth rotation platform 1 can include framework 5, emergency toilet 6, top ladder 7, external section transition channel 8, external hanging ladder 9, elevator shaft 10, radar control room 11, internal section transition channel 12, maintenance platform 13, liquid cooling equipment room 14, rotation control room 15 and electronic equipment room, etc.

[0074] As shown in Figure 5 The serial numbers 1-44 and P1, P2, P3, P4 in the figure are reference points (top reference point 18) of the installation interface measured on the top of the platform.

[0075] As shown in Figure 6 The circles at positions 11, 17, 19, 28, 35, 29, 23, 16 in the figure and the four circles around the center of the azimuth rotation platform represent the support points 17 of the second support tooling.

[0076] It should be noted that in actual application, the first support tooling can be used to install the azimuth rotation platform, and then the wheel rail system is directly installed without removing the first support tooling, and then the antenna back frame is directly installed, and finally the installation work is completed, but in this case, the wheel rail system cannot be tested.

[0077] The steel structure truss gravity sinking deformation measurement and adjustment method can be a large fixed station radar azimuth rotation platform steel structure truss gravity sinking deformation measurement and adjustment method. The problems of large error of the traditional wire pulling method and large design and production difficulty of the pre-arch method are solved.

[0078] The reference points established on the top surface installation interface during the pre-assembly of the azimuth rotation platform in the factory are measured and recorded by using a total station. After the azimuth rotation platform is disassembled and transported to the designated site, it is assembled and built again. The reference points on the top surface installation interface are measured by using a total station. The measured values and the theoretical values are compared and analyzed in the data processing software to obtain the error of the reference points of the azimuth rotation platform after the site recovery. At this time, the levelness information and the difference of each interface measurement point can be obtained.

[0079] Wherein, the azimuth adjustment platform top has multiple interfaces, the reference point of each interface is measured respectively, and after all the measurements are completed, the calculation and analysis of all the measurement data of each reference point are performed. During the measurement at a certain stage, each point is collected once (using a total station and a target ball). During each stage of the entire construction process, when the accuracy of the reference point needs to be ensured or when the variation of each reference point needs to be known, the measurement needs to be performed again. The multiple interfaces have different changes, some are raised and some are lowered, and the recovery state is good in the case of supporting by a tooling (first supporting tooling) after on-site recovery.

[0080] The data of each group, i.e., the coordinate values of the points, are unified into one coordinate system, the deviations of each point are compared, and the changes of the position and the height difference, i.e., the error, are obtained. The height difference has the greatest influence and is the most important. The theoretical value, i.e., the ideal point position on the drawing, the theoretical coordinates of each interface point, are absolutely flat without height difference. In practice, there is a deviation from the theoretical value. After the construction is completed, the comparison with the theoretical value can be performed, and the adjustment of the subsequent process is also controlled according to the theoretical value. The comparison with the factory value is performed to obtain the variation after the disassembly, transportation and recovery, and to leave experience data.

[0081] In the site, a stable and unchanging fixed reference point is set, a total station is used to measure the reference points of the top surface installation interfaces, and the absolute height difference between the measurement data of each point and the fixed reference point can reflect the levelness and the variation during the construction process.

[0082] Among them, a special reference point can be set, i.e., a reference point is specially poured and constructed, and the state of the reference point is unchanged during the entire erection process. The reference point is convenient for instrument observation and has good visibility. The reference point can also be set by using the existing unchanged foundation on site. The same point can be ensured by using a target ball tooling during each measurement.

[0083] In the design, a transition beam column is pre-set between the azimuth adjustment platform and the antenna back frame, the position and height of the transition beam column are adjusted according to the on-site measurement data, the top surface of the transition beam column meets the accuracy requirement, and then welding is performed on site. The transition beam column is located and the height difference is measured by using a level, a ruler and a tooling. The top surface of the transition beam column is further adjusted by using a gasket, and finally a better antenna back frame bottom beam joint installation reference is obtained.

[0084] Among them, the measurement on the upper part is without absolute value reference, and the data measured is the relative height difference obtained by fitting a plane by using the data measured this time. When there is a fixed reference point, the absolute height difference can be obtained. In addition, the variation of each point can be monitored in the subsequent process. Or, the fixed reference point is used as a reference to compare and analyze the relative height relationship of different systems and different components, or as a transition reference when the line of sight is blocked during the measurement of different components.

[0085] A transition column is arranged at the interface position of each turning platform (azimuth turning platform) and antenna back frame, as a transition structure for connecting and fixing the two, which is a steel structure beam. The transition column is welded with the turning platform on site, and the antenna back frame is connected with the transition column through flange screwing.

[0086] The transition column is adjusted according to the height difference of each interface point measured, and the height of the transition column is adjusted to adapt to the height difference, so that the top surface is horizontal. The position of the transition column is determined according to the theoretical position through measurement, light and tool positioning.

[0087] The gasket is installed on the top flange surface of the transition column, between the bottom surface of the antenna back frame and the top surface of the transition column, and is a means for final adjustment of the levelness.

[0088] Further, step S13 further comprises:

[0089] S14, respectively measuring the fourth height difference data of the top end of each transition column relative to the fixed reference point, to obtain a plurality of second height difference values;

[0090] S15, respectively according to the plurality of second height difference values, one-to-one processing a plurality of gaskets;

[0091] S16, one-to-one installing the plurality of gaskets on the plurality of transition columns;

[0092] S17, installing the antenna back frame on the top end of the azimuth turning platform;

[0093] S18, removing the second supporting tool.

[0094] The beneficial effects of the above further technical solutions are that the level meter, ruler and tool are used for line positioning and height difference measurement of the transition column. The gasket is used for further adjustment of the top surface of the transition column, and finally a better installation reference of the antenna back frame bottom beam joint is obtained.

[0095] Further, in step S16, the top end of the transition column is provided with a top end flange, and the gasket is installed on the top end flange of the transition column.

[0096] The beneficial effects of the above further technical solutions are that the gasket and the antenna back frame are convenient to install and maintain, and the work efficiency is improved.

[0097] Further, in step S17, the bottom end of the antenna back frame is provided with a bottom end flange, the antenna back frame is installed on the top end flange at the top end of the azimuth turning platform through the bottom end flange, and the gasket is located between the top end flange and the bottom end flange.

[0098] The beneficial effect of the further technical scheme is that the gasket and the antenna back frame are convenient to install and maintain, and the work efficiency is improved.

[0099] Further, step S1 includes:

[0100] S111, setting a plurality of top end reference points on the mounting surface of the azimuth turning platform top end and the antenna back frame;

[0101] S112, producing and pre-assembling the azimuth turning platform by taking the plurality of top end reference points as references;

[0102] S113, measuring the top end reference points of the pre-assembled azimuth turning platform by a total station instrument to obtain first position data and fifth height difference data of the pre-assembled azimuth turning platform, wherein the fifth height difference data is a theoretical value.

[0103] The beneficial effect of the further technical scheme is that the reference points are set on the mounting surface of the top of the azimuth turning platform and the antenna back frame, and the reference points are taken as references in the production and welding of the pre-assembled azimuth turning platform to ensure the position and levelness and improve the precision.

[0104] Further, in step S13, the plurality of transition beam columns are installed one by one at a plurality of interface positions of the top end of the azimuth turning platform and the antenna back frame, wherein the top end reference points are interface centers.

[0105] The beneficial effect of the further technical scheme is that one reference point is established for each group of installation interface centers to ensure that the antenna back frame and the azimuth turning platform can be docked, and the antenna back frame is convenient to install and maintain, and the precision is improved.

[0106] Further, the second supporting tool includes a bracket and a jack, and the jack is installed at the top of the bracket.

[0107] The beneficial effect of the further technical scheme is that the azimuth turning platform is additionally supported before the antenna back frame is hoisted, the bracket and the jack are used to support and lift up, and the top surface flatness is adjusted. During the construction of the antenna back frame, the load is shared by the second supporting tool to resist sinking and ensure a small overall sinking amount.

[0108] Further, the bracket is an I-beam, and a steel plate is installed at the top end of the jack.

[0109] The beneficial effect of the further technical scheme is that the bracket is an I-beam to improve the load strength of the bracket. The steel plate is arranged to disperse the contact points and concentrate the pressure, and the stability and reliability of the supporting tool are improved.

[0110] Further, the plurality of second supporting tools are arranged in a ring.

[0111] The beneficial effect of the further technical scheme is that a stable support structure of the azimuth rotation platform is formed, and the load strength is improved.

[0112] Further, the wheel-rail system is a plurality of roller support mechanisms.

[0113] The beneficial effect of the further technical scheme is that the azimuth rotation platform is facilitated to move.

[0114] Taking the erection process of a large radar as an example, the radar is a ground fixed station, the azimuth rotation platform has an outline size of about φ50m*4m, the steel structure truss of the azimuth rotation platform has a self weight of about 550 tons, and the top carries about 1000 tons. Through measurement and adjustment, smooth erection and high-precision horizontal level reference are realized.

[0115] The reference points are arranged on the mounting surface of the top of the azimuth rotation platform and the butt joint of the antenna back frame. In the production welding and manufacturing pre-assembly, the reference points are taken as the reference to ensure the position and levelness. Then, the steel structure truss of the azimuth rotation platform is disassembled, transported to the radar station site (position site), the bottom is provided with a support tool (first support tool), and the truss is hoisted and restored. The total station is used to measure the top reference points of the azimuth rotation platform and the fixed reference points on the site, and the vertical difference peak-to-peak value is within 5mm.

[0116] The in-plant pre-assembly and welding forming are simultaneously performed. In the pre-assembly, the accuracy of the key positions and interface positions is ensured, which is taken as the reference and positioning, and then other non-accurate control positions are welded. After the welding forming, the accuracy of the key positions is ensured. The interface reference points are taken as the control and mark points in the whole production, assembly and erection recovery process, and represent the functional accuracy of the whole steel structure, which needs to be measured multiple times in each stage.

[0117] Subsequently, the erection support tool (first support tool) is disassembled, and the wheel-rail system is tested.

[0118] After the tool (first support tool) is disassembled, the top reference points of the azimuth rotation platform and the fixed reference points on the site are measured, and the vertical difference peak-to-peak value is about 26mm, and the actual measured absolute subsidence of the center position is 28mm.

[0119] The overall structure of the azimuth adjusting platform is a large flat truss when it is built alone, and in this state, the vertical rigidity is poor. After the top antenna back frame is built, the height is about 50 meters, and the overall structure is a thick plate truss, and in this state, the rigidity is good. The installation process of the antenna back frame is from bottom to top in four layers, and each layer is from one side to the other side, and the whole process is a process of gradually applying uneven load, and the improvement of overall rigidity is small in the process, and the increase of gravity load plays a major role, so if the azimuth adjusting platform is only supported by the six groups of peripheral rollers, the subsidence of the central pivot will further increase during the installation of the antenna back frame, which will increase the installation difficulty of the antenna back frame. If the azimuth adjusting platform is additionally supported inside the bottom in addition to the six groups of peripheral rollers, the load is shared by the supporting tool (second supporting tool) during the installation of the antenna back frame, and the subsidence is resisted, and after the antenna back frame is built, the overall rigidity is greatly improved, that is, the antenna back frame can provide resistance force to resist the gravity subsidence of the azimuth adjusting platform, and at this time, the additional support points of the azimuth adjusting platform are removed, and the system gravity is single loaded, and the rigidity of the system is improved, which can ensure small overall subsidence. Therefore, before the antenna back frame is lifted, the additional support (second supporting tool) of the azimuth adjusting platform is implemented, and the tool plus jack is used to support and lift, and the flatness of the top surface is adjusted.

[0120] Among them, the additional support points need to consider the overall bearing capacity and uniform loading, consider the composite bearing capacity of the adjusting platform (azimuth adjusting platform) steel structure skeleton, and in addition, the workload needs to be considered. In actual engineering, after evaluation, discussion and accounting, the points are arranged in a ring shape from inside to outside, 4 points in the innermost circle, 4 points in the outer circle, and 4 points in the outer circle, a total of 12 points, and the outermost periphery has the roller support of the wheel rail system.

[0121] The load capacity and rigidity of the supporting tool need to meet the requirements, and the load is basically the total weight minus the bearing weight of the wheel rail roller under the current state, and then it is analyzed according to the number of support points, and a safety factor is left. The inner circle support point is under greater stress. The support point structure can adopt large section I-beam, and 100-ton jacks are arranged at the top of each supporting tool for slowly applying and controlling the lifting force and slowly controlled synchronous uniform unloading and removal after the completion of the construction. The contact point pad between the jack top rod and the adjusting platform is a 30mm thick large area steel plate, which disperses the concentrated pressure of the contact point, and the jack top is provided with a clamping stop structure to prevent the stress from deviating, and to avoid the risk of collapse in the lateral direction.

[0122] After the azimuth adjusting platform is re-supported and lifted, the reference points and the fixed reference points on the top of the azimuth adjusting platform are measured, and the vertical difference peak-to-peak value is within 11.5mm, and most of the points are within ±5mm.

[0123] After the azimuth adjusting platform is lifted by the additional support, the transition beam column is processed according to the measurement results, the height difference is adjusted and offset, the transition beam column is welded on the top of the azimuth adjusting platform, the height difference is ±1.5mm, the position deviation is ±1.5mm, the height difference of the top flange surface after welding is ±2mm, and the levelness of a single transition beam column is 1.5mm. The top surface of the transition beam column is further adjusted by using a gasket, and the final height difference of the antenna back frame bottom beam joint installation reference is ±0.5mm.

[0124] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for measuring and adjusting the gravitational settlement deformation of a steel truss structure, characterized in that, include: S1. Set up the first support fixture for erecting the azimuth-shifting platform at the site and begin building the azimuth-shifting platform. S2. Establish fixed reference points at the site according to preset values; S3. During the construction of the azimuth adjustment platform, the first elevation difference data of multiple top reference points of the azimuth adjustment platform relative to the fixed reference point is measured at least once using a total station to obtain the first vertical elevation difference peak value. S4. Determine whether the peak value of the first vertical height difference peak is within the first preset range; S5. When the peak value of the first vertical height difference is not within the first preset range, adjust the orientation adjustment platform to control the peak value of the first vertical height difference within the first preset range, and complete the orientation adjustment platform construction work. S6. Install the wheel-rail system on the bottom periphery of the azimuth-turning platform, remove the first support fixture, and test-rotate the wheel-rail system. S7. Using a total station, perform at least one second measurement on the second elevation difference data of multiple top reference points of the orientation adjustment platform relative to the fixed reference point to obtain the peak value of the second vertical elevation difference; S8. Determine whether the peak value of the second vertical height difference is within the second preset range; S9. When the peak value of the second vertical height difference is not within the second preset range, multiple second support fixtures with lifting function are installed at the bottom center of the orientation adjustment platform. S10. The second support tooling is used to lift the positioning adjustment platform so that the peak value of the second vertical height difference is controlled within the second preset range. S11. Measure the third elevation difference data of multiple top reference points of the orientation adjustment platform relative to the fixed reference point to obtain multiple first elevation difference values; S12. Process multiple transition beams and columns according to the multiple first elevation difference values; S13. Install the multiple transition beams and columns one by one on the multiple top reference points of the orientation adjustment platform; Step S13 and the following steps include: S14. Measure the fourth elevation difference data of the top of the multiple transition beam columns relative to the fixed reference point to obtain multiple second elevation difference values; S15. Process multiple gaskets according to the multiple second height difference values ​​one by one; S16. Install the multiple gaskets one by one onto the multiple transition beams and columns; S17. Install the antenna back frame on the top of the azimuth adjustment platform; S18. Remove the second support fixture.

2. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, In step S16, a top flange is provided at the top of the transition beam column, and a gasket is installed on the top flange of the transition beam column.

3. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 2, characterized in that, In step S17, the antenna back frame is provided with a bottom flange at the bottom end. The antenna back frame is installed on the top flange located at the top of the azimuth adjustment platform through the bottom flange, and the gasket is located between the top flange and the bottom flange.

4. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, Before step S1, the following are included: S111. Multiple top reference points are set on the mounting surface at the top of the azimuth adjustment platform that connects with the antenna back frame. S112. Using multiple top reference points as references, produce and pre-assemble an orientation adjustment platform; S113. The top reference point of the pre-assembled azimuth-turning platform is measured using a total station to obtain the first position data and preset value of the pre-assembled azimuth-turning platform.

5. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, In step S13, the multiple transition beams are installed one-to-one at multiple interface positions on the top of the azimuth adjustment platform where they connect with the antenna back frame, wherein the top reference point is the center of the interface.

6. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, The second support fixture includes a bracket and a jack, with the jack installed on top of the bracket.

7. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 6, characterized in that, The support frame is made of I-beams, and a steel plate is installed on the top of the jack.

8. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, Multiple second support fixtures are arranged around each other.

9. The method for measuring and adjusting the gravitational settlement deformation of a steel truss according to claim 1, characterized in that, The wheel-rail system is supported by multiple rollers.

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