Horizontal displacement control method for core tube offset super high-rise structure based on wall sideline offset

Abstract

The invention discloses a horizontal displacement control method for a core tube offset super high-rise structure based on wall sideline offset, which performs layer-by-layer offset based on surveying and setting-out, effectively reduces horizontal displacement caused by core tube offset, and has a remarkable horizontal displacement control effect. Due to the fact that horizontal reverse deviation is mainly achieved by changing the distance between the wall body design sideline and the construction control sideline in the construction period, a large deviation rectifying device does not need to be used, the deviation rectifying construction comprehensive cost is effectively reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for controlling horizontal displacement of a core tube offset super-high-rise structure based on wall edge line offset. Background Art

[0002] The construction industry is a pillar industry of my country's national economy and plays an important role in national construction. At present, the reserve of construction land in urban areas is getting smaller and smaller, and super-high-rise buildings with higher volume ratios have become the first choice for office buildings. In pursuit of a better user experience, the asymmetric plane (core tube offset) structural design can focus on the use of vision and lighting to create a better office experience, and has become a more architectural design choice.

[0003] During the construction of super high-rise buildings, lateral displacement control is particularly important, especially for super high-rise structures with offset core tubes. Since the offset core tube causes the misalignment of the structural center of gravity and the rigidity center, the super high-rise structure will inevitably produce lateral displacement under the vertical load due to the inconsistent deformation of the core tube and the outer frame structure. As the height of the super high-rise increases, the lateral displacement value gradually increases. For the lateral displacement deviation found during the construction process, the error is generally corrected by adjusting the construction sequence (such as completing the core components or symmetrical components first) or real-time correction of important components (such as adjusting the installation position of steel beams). However, there is still a large lag and uncertainty.

[0004] Common control measures such as adjusting the construction sequence and carrying out construction in stages during the above construction process can only passively reduce the lateral displacement of the tower caused by construction errors, but cannot actively correct the horizontal displacement caused by the core tube offset, and the lateral displacement control effect is poor.

[0005] If a deviation correction device is used to apply external force to the structure to actively intervene in the deviation correction, the device is usually composed of multiple sets of hydraulic jacks, servo cylinders, etc., and the device cost is high, which increases the construction cost. At the same time, the deviation correction operation requires additional time to arrange, which may affect the overall construction period, and requires an experienced professional team to operate, which is highly dangerous. Summary of the invention

[0006] In view of the above technical problems in the existing construction for lateral displacement control, the purpose of the present invention is to provide a method for controlling the horizontal displacement of a super-high-rise structure with a core tube offset based on the offset of the wall edge line, which performs layer-by-layer offset based on measurement and setting out, effectively reduces the horizontal displacement caused by the core tube offset, and has a significant effect on the horizontal displacement control. Since the horizontal reverse offset is mainly achieved by changing the distance between the wall design edge line and the construction control edge line during the construction period, there is no need to use a large-scale deviation correction device, which effectively reduces the comprehensive cost of deviation correction construction and improves construction efficiency.

[0007] In order to achieve the above-mentioned object, the present invention provides a method for controlling horizontal displacement of a core tube-biased super-high-rise structure based on the offset of the wall edge line, the method comprising the following steps:

[0008] Step 1: Pre-construction data analysis and plan formulation;

[0009] Before construction, the horizontal displacement deviation of the core tube super-high-rise structure is predicted through finite element analysis, and the maximum displacement position and trend are identified. According to the analysis results, the anti-arch targets are set in stages, and a correction plan that matches the displacement trend is formulated to ensure that the anti-arch amount is reasonable and the construction accuracy is guaranteed;

[0010] Step 2: Layer-by-layer deviation based on surveying and setting out. The specific construction steps include:

[0011] Step 2.1: Arrange control points and control lines to accurately measure the distance between the wall edge and the control line;

[0012] Step 2.2: Complete preliminary measurement and layout according to the design documents, project the reference point data and calibrate the control line position, calibrate the wall axis and edge line, check the error and adjust the layout data;

[0013] Step 2.3: On this basis, introduce a deviation correction scheme to adjust the distance between the core tube wall axis and the control line to ensure that the wall template deviates in the preset direction to meet the design value requirements of the deviation target curve, and reposition the control points every 5-10 floors to ensure the accuracy of the layout and the quality of construction;

[0014] Step 3: Deformation monitoring of the entire tower;

[0015] According to the above method of adjusting the wall line measurement position layer by layer, control will continue to be carried out according to the actual measurement results during the later construction period, and the overall deformation of the tower will be measured regularly using a scanner, and auxiliary monitoring will be carried out using Leica high-precision total station and prism;

[0016] Step 4: Pre-arch deviation correction and calibration;

[0017] The pre-arch correction scheme is dynamically adjusted according to the actual measurement results. Multiple displacement calibration points are set, and the relative deformation of the displacement calibration points at each construction stage is obtained through high-precision measurement methods. The rationality of the actual correction scheme is judged based on the measurement results, and adjustments are made.

[0018] Furthermore, the specific construction steps of step 2.2 are as follows: first, according to the design documents, select the reference points in the structural control network as the reference for this step of measurement and layout, use high-precision measuring instruments to accurately project the reference point data to the construction floor, and correct the control line position, and then according to the design drawings, use the corrected control lines to accurately calibrate the axis and edge position of the wall, and mark them on the wall surface or the ground, and then after the layout is completed, use the measuring instrument to review the calibrated axis position to check whether the horizontal error and vertical error are within the allowable range. If the error exceeds the specified value, the layout data needs to be adjusted to ensure that the accuracy of the measurement and layout meets the design requirements.

[0019] Furthermore, the specific construction steps of the whole tower deformation monitoring in step 3 are: using a high-precision three-dimensional laser scanner, using the principle of laser ranging, setting up a station on the north side of the building to scan the north facade of the core tube to obtain point cloud data, the point cloud spacing in the horizontal direction is about 1 cm, and the point cloud spacing in the height direction is about 5 cm, and processing the point cloud data, that is, statistically analyzing the point cloud data within each meter elevation range to obtain the representative value of the horizontal displacement of the core tube in the height range, and finally obtaining the overall deformation curve of the building;

[0020] Then, prisms are arranged every 3 to 5 layers in the height direction on the core tube. The initial coordinates of each monitoring point are read using a Leica high-precision total station, and the coordinates of the prisms are remeasured regularly. The horizontal displacement changes of each monitoring point in the core tube can be obtained through the changes in the coordinates of the prisms.

[0021] Furthermore, the specific construction steps of the pre-arch deviation correction and calibration in step 4 are:

[0022] Step 4.1: First, arrange several observation points;

[0023] Step 4.2: Record the relative deformation Δoi;

[0024] Step 4.3: Extract simulation deformation Δdi;

[0025] Step 4.4: Calculate the adjustment factor ki;

[0026] Step 4.5: Adjust the correction scheme based on the coefficient ki;

[0027] Step 4.6: Implement the revised measurement and layout.

[0028] Furthermore, the calculation of the adjustment coefficient ki is shown in the following formula:

[0029]

[0030] The calculation of the adjustment coefficient is based on the ratio of the actual measurement results to the analysis results at different calibration points. After comprehensive comparison, the average value is taken as the final adjustment coefficient. Through this iterative optimization method, the formulated correction strategy can be more in line with the actual construction conditions, thereby significantly improving the accuracy of horizontal displacement control.

[0031] Compared with the prior art, the core tube offset super high-rise structure horizontal displacement control method based on wall edge line offset provided by the present invention has the following beneficial effects:

[0032] (1) The construction pre-arch control scheme based on measuring and setting out and executing layer-by-layer offset can effectively reduce the horizontal displacement caused by the core tube offset, and the horizontal displacement control effect is significant;

[0033] (2) The displacement control method proposed in the present invention advocates that the distance between the design edge line of the wall and the construction control line during the construction period is changed to achieve the offset, and the non-traditional structural external force is adjusted or constrained. Therefore, there is no need to use a large-scale correction device, which effectively reduces the comprehensive cost of the correction construction and improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Figure 1 A schematic diagram of the arrangement of control points and control lines in the horizontal displacement control method of a core tube offset super-high-rise structure based on the wall edge line offset provided by the present invention;

[0036] Figure 2 A schematic diagram of adjusting the wall edge line offset in the core tube offset super-high-rise structure horizontal displacement control method based on the wall edge line offset provided by the present invention;

[0037] Figure 3 This is a schematic diagram of the traditional formwork method;

[0038] Figure 4 A schematic diagram of a pre-arch control formwork method in a core tube offset super-high-rise structure horizontal displacement control method based on wall edge line offset provided by the present invention;

[0039] Figure 5 The present invention provides a flow chart of pre-arch deviation correction and calibration in the horizontal displacement control method of a core tube offset super-high-rise structure based on wall edge line deviation. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0041] Based on the fact that the existing construction is a passive deviation correction method, the construction cost is high and the adjustment difficulty is great, the horizontal displacement control method of the core tube offset super-high-rise structure based on the wall edge line deviation provided by the present invention is an active deviation correction method, which is based on the construction pre-arch control scheme of performing layer-by-layer deviation based on measurement and setting out, and can effectively reduce the horizontal displacement caused by the core tube offset, save the subsequent deviation correction cost, and the comprehensive construction cost is low, and the horizontal displacement control effect is significant. The construction method comprises the following steps:

[0042] Step 1: Pre-construction data analysis and plan formulation;

[0043] Before construction, the horizontal displacement deviation of the core tube super-high-rise structure is predicted through finite element analysis, and the maximum displacement position and trend are identified. According to the analysis results, the anti-arch targets are set in stages, and a correction plan that matches the displacement trend is formulated to ensure that the anti-arch amount is reasonable and the construction accuracy is guaranteed;

[0044] Based on the finite element simulation results, the position where the core tube may have the maximum horizontal deviation and the deviation trend are identified, and the staged anti-arch targets are set. In combination with the structural characteristics and through the configuration objective function, a correction plan is formulated to ensure that the anti-arch amount matches the deviation trend.

[0045] Step 2: Layer-by-layer deviation based on surveying and setting out. The specific construction steps include:

[0046] Step 2.1: Arrange control points and control lines to accurately measure the distance between the wall edge and the control line;

[0047] As an example, Figure 1 In this example, multiple control points and control lines are set inside the wall, and the distances between the south wall edge line, the middle wall edge line, and the north wall edge line and the control lines are measured.

[0048] Step 2.2: Complete preliminary measurement and layout according to the design documents, project the reference point data and calibrate the control line position, calibrate the wall axis and edge line, check the error and adjust the layout data;

[0049] The specific construction steps of the above step 2.2 are as follows: first, according to the design documents, select the reference points in the structural control network as the reference for this step of measurement and layout. Use high-precision measuring instruments to accurately project the reference point data to the construction floor and calibrate the control line position. Then, based on the design drawings, use the calibrated control lines to accurately calibrate the axis and edge positions of the wall, and mark them on the wall surface or the ground. After the layout is completed, use the measuring instrument to review the calibrated axis position to check whether the horizontal error and vertical error are within the allowable range. If the error exceeds the specified value, the layout data needs to be adjusted to ensure that the accuracy of the measurement and layout meets the design requirements.

[0050] Step 2.3: On this basis, introduce a deviation correction scheme to adjust the distance between the core tube wall axis and the control line to ensure that the wall template deviates in the preset direction to meet the design value requirements of the deviation target curve, and reposition the control points every 5-10 floors to ensure the accuracy of the layout and the quality of construction;

[0051] Specifically, this step, based on the completion of traditional measurement and layout (according to the design drawings), introduces a correction scheme to optimize the layout process before concrete pouring. Figure 2 , which is a schematic diagram of the wall edge line deviation adjustment method. Under the premise of keeping the reference point and the control line unchanged, the distance between the axis of each wall of the core tube and the control line is adjusted according to the designed deviation correction plan. This adjustment ensures that the wall template is offset in the preset direction, thereby achieving precise control of the core tube wall position. This improved method not only ensures the accuracy of the control network, but also meets the special deviation requirements of design and construction, providing a more reliable technical guarantee for the construction of super high-rise buildings.

[0052] Considering that the structure will shift to one side under the eccentricity during construction, the position control is conducive to the horizontal deviation of the current construction layer to reach the design value of the target curve. Furthermore, according to the site needs and subsequent monitoring results, it is possible to reposition the measurement control point from the ground base point every 5-10 floors.

[0053] Furthermore, to facilitate measurement and layout, the edge position of the wall can be offset every several layers, and the offset wall edge can provide a position reference for template installation.

[0054] When pre-arch control is not used, the verticality deviation of the wall is 0, and the wall line position remains unchanged; when pre-biasing of each layer is used, the pre-bias of the bottom of each layer of the wall should not exceed 20mm according to the original wall position, and the verticality of the template is also adjusted accordingly. The wall line position changes with the offset, such as Figure 3 , Figure 4 .

[0055] Figure 2 This is a schematic diagram of the traditional formwork method. Figure 3This is a schematic diagram of the pre-arch controlled formwork method. It is just for example. Taking a certain construction section as an example, now the N to N+5 floors need to be pre-arched 10mm to the north for each floor. The correction order is as follows: ① The bottom of the wall of the Nth floor is positioned according to the original wall position, and the verticality of the formwork is controlled within 0-5mm; ② The bottom of the wall of the N+1th floor is positioned according to the original wall position and pre-biased by 10mm, and the verticality of the formwork is controlled within 0-5mm; ③ The bottom of the wall of the N+2th floor is positioned according to the original wall position and pre-biased by 20mm, and the verticality of the formwork is controlled within 0-5mm; ④ The bottom of the wall of the N+3th floor is positioned according to the original wall position and pre-biased by 30mm, and the verticality of the formwork is controlled within 0-5mm; ⑤ The bottom of the wall of the N+4th floor is positioned according to the original wall position and pre-biased by 40mm, and the verticality of the formwork is controlled within 0-5mm; ⑥ The bottom of the wall of the N+5th floor is positioned according to the original wall position and pre-biased by 50mm, and the verticality of the formwork is controlled within 0-5mm.

[0056] Step 3: Deformation monitoring of the entire tower;

[0057] According to the above method of adjusting the wall line measurement position layer by layer, control will continue to be carried out according to the actual measurement results during the later construction period, and the overall deformation of the tower will be measured regularly using a scanner, and auxiliary monitoring will be carried out using Leica high-precision total station and prism;

[0058] The specific construction steps of the above-mentioned whole tower deformation monitoring are as follows: using a high-precision 3D laser scanner, using the principle of laser ranging, a station is set up on the north side of the building to scan the north facade of the core tube to obtain point cloud data. The point cloud spacing in the horizontal direction is about 1 cm, and the point cloud spacing in the height direction is about 5 cm. The point cloud data is processed, that is, the point cloud data within each meter elevation range is statistically obtained to obtain the representative value of the horizontal displacement of the core tube in this height range, and finally the overall deformation curve of the building is obtained;

[0059] Then, prisms are arranged every 3 to 5 layers in the height direction on the core tube. The initial coordinates of each monitoring point are read using a Leica high-precision total station, and the coordinates of the prisms are remeasured regularly. The horizontal displacement changes of each monitoring point in the core tube can be obtained through the changes in the coordinates of the prisms.

[0060] Step 4: Pre-arch deviation correction and calibration;

[0061] The pre-arch correction scheme is dynamically adjusted according to the actual measurement results. Multiple displacement calibration points are set, and the relative deformation of the displacement calibration points at each construction stage is obtained through high-precision measurement methods. The rationality of the actual correction scheme is judged based on the measurement results, and adjustments are made.

[0062] In order to achieve the pre-arch deviation correction goal of step (1), the layer-by-layer deviation construction strategy based on measurement and layout of step (2) is adopted during the construction process. Considering that the correction scheme specified in step (1) may deviate from the actual measured result of step (3), step (4) is the pre-arch deviation correction and calibration. It is necessary to set up multiple displacement calibration points and obtain the relative deformation of the displacement calibration points at each construction stage through high-precision measurement methods. According to the measurement results, it is judged whether the actual pre-arch target curve scheme is reasonable and adjusted. The flow chart is as follows Figure 5 As shown;

[0063] Step 4.1: First, arrange several observation points;

[0064] Step 4.2: Record the relative deformation Δoi;

[0065] Step 4.3: Extract simulation deformation Δdi;

[0066] Step 4.4: Calculate the adjustment factor ki;

[0067] Step 4.5: Adjust the correction scheme based on the coefficient ki;

[0068] Step 4.6: Implement the revised measurement and layout.

[0069] The calculation of the above adjustment coefficient ki is shown as follows:

[0070]

[0071] The calculation of the adjustment coefficient is based on the ratio of the actual measurement results to the analysis results at different calibration points. After comprehensive comparison, the average value is taken as the final adjustment coefficient. Through this iterative optimization method, the correction strategy formulated can be more in line with the actual construction conditions, thereby significantly improving the accuracy of horizontal displacement control.

[0072] In addition, the necessity of step (4) is supplemented: when the overall height of the structure is high, the pre-arch deviation value required to evenly distribute the maximum pre-arch correction value of the overall structure to each floor will be relatively small, but this may cause the actual construction verticality error of the single-layer wall to be greater than the correction value. For example, when the estimated maximum horizontal displacement correction value of a core tube offset super-high-rise structure with a total of 100 floors is 150mm, (the horizontal displacement correction value) distributed to each floor is only about 1.5mm, while the actual verticality construction error of the single-layer wall may reach 10mm or more. Therefore, the impact of actual construction errors must be fully considered. In other words, the pre-arch deviation correction and calibration steps are indispensable.

[0073] Based on the above steps, this scheme further optimizes the horizontal deformation control of the structure through the iterative method of "plan-execute-measure-feedback" to achieve higher accuracy and reliability. This method emphasizes the two-way effect of scheme formulation and actual feedback to ensure that the final construction results are consistent with the design requirements.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for controlling horizontal displacement of a core tube-biased super-high-rise structure based on the offset of the wall edge line, characterized in that: The method comprises the following steps: Step 1: Pre-construction data analysis and plan formulation; Before construction, the horizontal displacement deviation of the core tube super-high-rise structure is predicted through finite element analysis, and the maximum displacement position and trend are identified. According to the analysis results, the anti-arch targets are set in stages, and a correction plan that matches the displacement trend is formulated to ensure that the anti-arch amount is reasonable and the construction accuracy is guaranteed; Step 2: Layer-by-layer deviation based on surveying and setting out. The specific construction steps include: Step 2.1: Arrange control points and control lines to accurately measure the distance between the wall edge and the control line; Step 2.2: Complete preliminary measurement and layout according to the design documents, project the reference point data and calibrate the control line position, calibrate the wall axis and edge line, check the error and adjust the layout data; Step 2.3: On this basis, introduce a deviation correction scheme to adjust the distance between the core tube wall axis and the control line to ensure that the wall template deviates in the preset direction to meet the design value requirements of the deviation target curve, and reposition the control points every 5-10 floors to ensure the accuracy of the layout and the quality of construction; Step 3: Deformation monitoring of the entire tower; According to the above method of adjusting the wall line measurement position layer by layer, control will continue to be carried out according to the actual measurement results during the later construction period, and the overall deformation of the tower will be measured regularly using a scanner, and auxiliary monitoring will be carried out using Leica high-precision total station and prism; Step 4: Pre-arch deviation correction and calibration; The pre-arch correction scheme is dynamically adjusted according to the actual measurement results. Multiple displacement calibration points are set, and the relative deformation of the displacement calibration points at each construction stage is obtained through high-precision measurement methods. The rationality of the actual correction scheme is judged based on the measurement results, and adjustments are made.

2. The horizontal displacement control method of a core tube offset super high-rise structure based on the wall edge line offset according to claim 1 is characterized in that: The specific construction steps of step 2.2 are as follows: first, according to the design documents, select the reference points in the structural control network as the reference for this step of measurement and layout, use high-precision measuring instruments to accurately project the reference point data to the construction floor, and correct the control line position, and then according to the design drawings, use the corrected control lines to accurately calibrate the axis and edge position of the wall, and mark them on the wall surface or the ground. After the layout is completed, use the measuring instrument to review the calibrated axis position to check whether the horizontal error and vertical error are within the allowable range. If the error exceeds the specified value, the layout data needs to be adjusted to ensure that the accuracy of the measurement and layout meets the design requirements.

3. The horizontal displacement control method of a core tube offset super high-rise structure based on the wall edge line offset according to claim 1 is characterized in that: The specific construction steps of the whole tower deformation monitoring in step 3 are: using a high-precision three-dimensional laser scanner, using the principle of laser ranging, setting up a station on the north side of the building to scan the north facade of the core tube to obtain point cloud data, the point cloud spacing in the horizontal direction is about 1 cm, and the point cloud spacing in the height direction is about 5 cm, and processing the point cloud data, that is, statistically analyzing the point cloud data within each meter elevation range to obtain the representative value of the horizontal displacement of the core tube in the height range, and finally obtaining the overall deformation curve of the building; Then, prisms are arranged every 3 to 5 layers in the height direction on the core tube. The initial coordinates of each monitoring point are read using a Leica high-precision total station, and the coordinates of the prisms are remeasured regularly. The horizontal displacement changes of each monitoring point in the core tube can be obtained through the changes in the coordinates of the prisms.

4. The horizontal displacement control method of a core tube offset super high-rise structure based on the wall edge line offset according to claim 1 is characterized in that: The specific construction steps for pre-arch deviation correction and calibration in step 4 are: Step 4.1: First, arrange several observation points; Step 4.2: Record the relative deformation Δoi; Step 4.3: Extract simulation deformation Δdi; Step 4.4: Calculate the adjustment factor ki; Step 4.5: Adjust the correction scheme based on the coefficient ki; Step 4.6: Implement the revised measurement and layout.

5. The horizontal displacement control method of a core tube offset super high-rise structure based on the wall edge line offset according to claim 4 is characterized in that: The calculation of the adjustment coefficient ki is shown in the following formula: The calculation of the adjustment coefficient is based on the ratio of the actual measurement results to the analysis results at different calibration points. After comprehensive comparison, the average value is taken as the final adjustment coefficient. Through this iterative optimization method, the formulated correction strategy can be more in line with the actual construction conditions, thereby significantly improving the accuracy of horizontal displacement control.

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