Synchronous control and deviation correction method for pushing and sliding of large-span truss roof

Abstract

The invention discloses an intelligent synchronous control and deviation correction method for pushing slippage of a large-span truss roof, and belongs to the technical field of building engineering construction. The system comprises a multi-sensor fusion monitoring module and a distributed hydraulic pushing execution module, displacement, stress and attitude data are collected in real time, structural response is pre-judged in combination with a digital twinning technology, pushing parameters are dynamically adjusted based on an algorithm, and millimeter-level synchronous precision and active deviation correction are achieved. And meanwhile, in order to effectively control the central axis position deviation in the truss sliding process, a guide frame and a limiting pulley are arranged on the outer side of the lattice column tower to prevent the structure from being damaged due to overlarge deviation. The technical problems of poor synchronism, deviation correction lagging and structural instability in traditional pushing slippage are solved, and the construction safety and efficiency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a method for synchronous control and deviation correction of the pushing and sliding of a large-span truss roof. Background Art

[0002] Due to their excellent spatial performance, large-span truss roof structures are widely used in large buildings such as stadiums and exhibition halls. As an efficient installation method, push-and-slide construction technology involves laying a slideway underneath the structure and gradually pushing the roof structure into place using equipment such as jacks. However, in practice, many factors make construction difficult. Uneven friction between the various push points and the slideway, subtle differences in the equipment's operating status, and the complex mechanical properties of the roof structure itself can easily lead to asynchrony. Once asynchrony occurs, the roof will deflect and twist during sliding, seriously disrupting the construction progress, significantly increasing construction costs, and even worse, endangering structural safety and causing irreversible engineering accidents. Existing synchronization control and deviation correction methods lack accuracy and stability when dealing with complex working conditions, and cannot fully meet the stringent requirements of large-span truss roof construction. Therefore, developing an advanced and reliable synchronization control and deviation correction method is crucial to ensure the smooth progress of large-span truss roof construction. Summary of the Invention

[0003] The purpose of the present invention is to solve the difficult problem of synchronous control and deviation correction in the jacking and sliding of large-span truss roofs. During the sliding process, the forces on each jacking point vary greatly, resulting in local structural deformation or track offset. Large-span trusses have large weight and spans. During the jacking and sliding process, due to the action of their own weight and external forces, they are prone to overall deformation such as deflection and lateral bending. The displacement speeds of each jacking point are inconsistent, and the cumulative deviation exceeds the allowable range. The track settles, deflects or gets stuck, resulting in sliding interruption or truss offset. In order to solve the above problems, the present invention provides a method for synchronous control and deviation correction in the jacking and sliding of large-span truss roofs.

[0004] The technical solution adopted in the present invention is as follows:

[0005] Step 1: Install a high-precision displacement sensor (11) and a pressure sensor (12) at each pushing point. Place the above two sensors at the pushing points on both sides of the pushing slide. The displacement sensor (11) uses a high-precision sensor based on the laser ranging principle, and its measurement accuracy can reach ±0.5mm. It can accurately measure the displacement of the pushing point along the slide in real time. The pressure sensor (12) adopts a strain gauge type with a measurement accuracy of ±1% FS. It is used to monitor the thrust applied by the jack to the pushing point in real time to ensure that the thrust of each pushing point meets the design requirements;

[0006] Step 2: To effectively control the axis position deviation during the truss sliding process, a guide frame (8) is set on the outside of the lattice column tower. The guide frame (8) is supported by No. 8 I-beams. The guide frame is 15mm away from the outer edge of the structure to prevent the axis from deviating during the sliding process and to correct the deviation in time. When the monitoring system detects a large deviation during the roof sliding process, the roof is corrected using a transverse jack.

[0007] Step 3: MEMS tilt sensors (13) are placed at key locations of the roof structure, such as the mid-span nodes of the trusses, nodes near the supports, and stress concentration areas. The sensor (13) has a measurement accuracy of ±0.1° and can keenly capture the changes in the tilt angle of the roof during the jacking and sliding process, and monitor the roof posture in all directions. All sensors are connected to the data acquisition system via dedicated data cables. The data acquisition system transmits the collected data to the central control unit in real time with high speed and stable performance, providing an accurate data basis for subsequent control and decision-making;

[0008] Step 4: Install the limit frame (8) and the limit pulley (7) on the beam. The limit frame (8) is supported by No. 8 I-steel. The limit frame (8) is 15 mm away from the outer edge of the structure to prevent the axis from deviating during the sliding process and to correct the deviation in time. At the same time, the limit pulley (7) is installed on the limit frame to prevent the structure from being damaged due to large deviation during the sliding process.

[0009] Step 5: The central control unit continuously receives the real-time displacement data fed back by the displacement sensors of each jacking point, compares the displacement of each slave jacking point with the displacement of the reference point, and calculates the displacement deviation. Based on this deviation, an adaptive PID control algorithm is used. This algorithm can automatically adjust the control parameters according to the actual situation during the construction process, enhancing the accuracy and adaptability of the control. The algorithm generates thrust adjustment instructions for the jacks of each slave jacking point, and controls the hydraulic control system of the jack to accurately change the jack output, so that the displacement of each slave jacking point quickly approaches the displacement of the reference point, and the displacement deviation is always controlled within a very small range of ±5mm, achieving high-precision synchronous control;

[0010] Step 6: When the tilt sensor (13) detects that the roof has a plane deflection, that is, the tilt angle exceeds the preset normal range (such as ±0.5°), the central control unit quickly starts the correction program. According to the size and direction of the tilt angle, through precise mechanical calculations, the thrust value that needs to be reduced at the jacking point on the deflected side and the thrust value that needs to be increased at the jacking point on the other side are obtained. For example, if the roof deflects to the left, the jack thrust is appropriately reduced at the jacking point on the left, and the thrust is correspondingly increased at the jacking point on the right, and the torque generated by the thrust difference on both sides is used to push the roof to gradually return to a horizontal state. During the correction process, the displacement sensor data is referenced in real time to fine-tune the displacement of the jacking point to ensure that the overall synchronous sliding is not significantly affected while the roof is restored to a horizontal state;

[0011] Step 7: If a deviation occurs during the pushing process, a jack (9) can be installed on the beam and a reaction frame (10) can be installed on the outside of the beam body. When a deviation occurs, the pushing is stopped and the jack (9) is used to correct the deviation of the pushing component;

[0012] Step 8: Set multi-level warning thresholds for displacement deviation, thrust deviation and tilt angle in the central control unit. The first-level warning threshold is set close to the upper limit of the normal range, such as displacement deviation ±3mm, thrust deviation ±5%, and tilt angle ±0.3°. When the monitoring data reaches this threshold, the central control unit will send out an audible and visual warning signal to remind on-site construction personnel to pay close attention to the construction status and prepare to take corresponding measures. The second-level danger threshold is set close to the critical value that may cause structural safety problems, such as displacement deviation ±8mm, thrust deviation ±10%, and tilt angle ±1°. Once the data reaches this threshold, the system will immediately trigger an emergency response;

[0013] Furthermore, the displacement sensor (11) is a high-precision laser displacement sensor with a measurement accuracy of ±0.5 mm; the pressure sensor (12) is a strain gauge pressure sensor with a measurement accuracy of ±1% FS; the inclination sensor is a MEMS inclination sensor (13) with a measurement accuracy of ±0.1°;

[0014] Furthermore, the control terminal is an industrial control computer, which integrates a data processing module, a control algorithm module and a communication module. The data processing module is responsible for real-time analysis and processing of data collected by the sensor. The control algorithm module runs the preset control algorithm and generates thrust adjustment instructions. The communication module realizes data transmission and instruction interaction between the control terminal and the sensor and jack hydraulic control system.

[0015] Furthermore, the jack's hydraulic control system adopts a closed-loop control method, which can accurately adjust the jack's output thrust according to the thrust adjustment instructions sent by the control terminal. The hydraulic control system has a pressure overload protection function. When the jack's output pressure exceeds the set safety pressure threshold, it automatically stops working to protect the safety of equipment and personnel.

[0016] Furthermore, in the steps of establishing multiple early warning and emergency mechanisms, the early warning signals include sound and light alarm signals, which are issued through on-site alarm lights and speakers; the safety assessment in the emergency plan uses finite element analysis software to simulate and analyze the roof structure, and combines the actual on-site monitoring data to evaluate the safety and stability of the structure.

[0017] Furthermore, jacks (9) are installed on the beam, with a pair of jacks symmetrically arranged every 15-20 m outside the track, and installed perpendicularly to the track. At the same time, a reaction frame (10) is installed outside the beam body. When a deviation occurs, the movement is stopped and the deviation of the pushing component is corrected by using the jacks (9);

[0018] Furthermore, a limiting frame (8) and a limiting pulley (7) are installed on the beam. The limiting frame (8) is supported by No. 8 I-steel. The limiting frame (8) is 15 mm away from the outer edge of the structure to prevent the axis from deviating during the sliding process and to correct the deviation in time. At the same time, a limiting pulley (7) is installed on the limiting frame to prevent the structure from being damaged due to large deviation during the sliding process.

[0019] Furthermore, the installation positions of the displacement sensor (11) are at the sliding support points at both ends of the truss, the mid-span and the 1 / 4 node, and are used to monitor the linear displacement and synchronization error of the sliding; the installation position of the tilt sensor (13) is at the mid-span and the key nodes at both ends of the truss (welded or bolted), and is used to monitor the overall tilt angle of the truss to prevent deformation due to uneven force; the installation position of the pressure sensor (12) is at the top push point of the truss, and is used to monitor the real-time pressure change;

[0020] Furthermore, the installation and commissioning of the equipment includes the arrangement of the track (2) and the pusher (6), sensor calibration, and system integration; then the pusher and real-time monitoring are started, and when an offset occurs, dynamic correction is started, including lateral correction and longitudinal correction; when a large offset occurs, emergency treatment (manual intervention) should be carried out, and finally data management and construction review are carried out.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention installs displacement sensors, pressure sensors, and inclination sensors to monitor the displacement, pressure, and inclination data of each pushing point during the pushing process, analyzes the displacement deviation of each pushing point, and controls the deviation to a very small range, ensuring that the large-span truss roof slides along the designed trajectory without any deviation, greatly improving the construction and installation accuracy. By dynamically adjusting the hydraulic flow and pressure balancing algorithm, local overload is avoided, ensuring the stability of the sliding process, and laying a solid foundation for the long-term stable operation of the structure.

[0023] 2. This invention uses a central control unit to continuously receive real-time displacement data from displacement sensors at each jacking point. Using a control algorithm, it automatically adjusts control parameters based on actual construction conditions. This allows for timely containment of roof deflection and twisting, preventing accidents caused by excessive structural deformation and comprehensively safeguarding the lives of construction workers and the safety of project assets. Furthermore, intelligent algorithms replace manual real-time monitoring, reducing the need for skilled labor.

[0024] 3. The present invention provides a limit frame and a limit pulley to avoid a large offset of the roof structure caused by the asynchronous pushing of each pusher during the pushing and sliding process. At the same time, the provision of a limit pulley can effectively prevent damage to the roof structure, which is both economical and efficient and conducive to the long-term stable operation of the structure.

[0025] 4. The present invention is provided with a transverse jack. During the pushing and sliding process, the roof can be corrected to its original position by the transverse jack after displacement occurs. This method avoids the problem of difficulty in correcting the displacement when the structure is greatly displaced, and is both simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the roof push-and-slide construction of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the position limiting guide frame of the present invention;

[0029] Figure 4 This is a schematic diagram of the transverse jack correction structure of the present invention;

[0030] Figure: 1. Temporary support structure; 2. Rail; 3. Bottom plate; 4. Limit block; 5. Track beam; 6. Thruster; 6-1. Thruster main hydraulic cylinder; 6-2. Thruster tightening device; 7. Limit pulley; 8. Channel steel limit frame; 9. Transverse jack; 10. Reaction frame; 11. Displacement sensor; 12. Pressure sensor; 13. Inclination sensor; 14. Guide pulley; 15. Roof; 16. Support. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-4 The present invention provides a technical solution: a method for synchronous control and deviation correction of the top-pushing and sliding of a large-span truss roof, comprising the following steps:

[0033] Step 1: Sensor deployment and data collection

[0034] 1. Install a high-precision laser displacement sensor (11) and a strain gauge pressure sensor (12) at each jacking point. The displacement sensor (11) has a measurement accuracy of ±0.5mm, and the pressure sensor (12) has a measurement accuracy of ±1% FS. The installation positions of the displacement sensor (11) cover the sliding support points at both ends of the truss, the mid-span and the 1 / 4 node, and are used to monitor the displacement of the sliding line and the synchronization error; the pressure sensor (12) is directly fixed at the jacking point to collect the thrust data of the jack in real time (see Figure 1 、 Figure 2 ).

[0035] 2. MEMS tilt sensors (13) are fixed by welding or bolting at key locations of the roof structure (such as truss mid-span nodes, nodes near supports, and stress concentration areas). The measurement accuracy is ±0.1° and is used to monitor the overall tilt angle of the roof during the sliding process (see Figure 2 ).

[0036] 3. All sensors are connected to the industrial control computer (control terminal) through shielded data cables, and the displacement, thrust and inclination data are transmitted to the data processing module in real time.

[0037] Step 2: Reference point setting and synchronous control

[0038] 1. Select a certain push point as a reference point and preset its sliding speed curve and displacement trajectory. The control terminal obtains the displacement data of each push point in real time through the displacement sensor (11) and calculates its displacement deviation from the reference point.

[0039] 2. Adopting an adaptive PID control algorithm, the system dynamically generates thrust adjustment commands for the jacks at each slave push point based on the displacement deviation. For example, if a slave push point lags behind the reference point by 3mm, the hydraulic closed-loop control system increases the thrust of the jack at that point until the displacement deviation converges to within ±5mm.

[0040] Step 3: Active correction mechanism

[0041] 1. When the tilt sensor (13) detects that the roof tilt angle exceeds a preset threshold (such as ±0.5°), the control terminal immediately starts the correction program:

[0042] Plane deflection correction: If the roof tilts to the left, reduce the thrust at the left top push point and increase the thrust at the right side. The difference in thrust on both sides will generate a correction torque to restore the roof to a horizontal position (see Figure 4 ).

[0043] Torsion correction: Combined with the finite element model of the roof structure, the thrust vector required for the jacking points at different positions is calculated, and the torsional moment is generated by adjusting the thrust direction and magnitude to offset the roof torsion (see Figure 2 ).

[0044] 2. During the correction process, the displacement sensor data is synchronously referenced to fine-tune the displacement of the push point to ensure that the correction does not affect the overall synchronous slip.

[0045] Step 4: Install the limit and anti-drift device

[0046] 1. Install a channel steel limit frame (8) on the outside of the track beam (5), made of No. 8 I-beam, 15mm away from the outer edge of the structure, for rigidly restraining the sliding axis deviation (see Figure 3 ).

[0047] 2. A limiting pulley (7) is installed on the limiting frame (8), which contacts the rail (2) to reduce friction and prevent excessive deviation from causing structural damage.

[0048] 3. Arrange transverse jacks (9) and reaction frames (10) symmetrically every 15-20m on the outside of the track. When the deviation exceeds the threshold, stop pushing and start the transverse jacks (9) to force the deviation to be corrected (see Figure 4 ).

[0049] Step 5: Multi-level early warning and emergency response

[0050] 1. Set two-level warning thresholds for displacement deviation, thrust deviation, and tilt angle in the control terminal:

[0051] Level 1 warning (±3mm displacement, ±5% thrust, ±0.3° tilt): triggers an audible and visual alarm to prompt construction personnel to check the equipment status.

[0052] Level 2 danger threshold (±8mm displacement, ±10% thrust, ±1° tilt): Pushing stops automatically and emergency plan is activated, including equipment maintenance, finite element safety assessment and slideway flatness adjustment (see Figure 1 ).

[0053] 2. After the emergency plan is implemented, structural stability must be confirmed through a safety assessment before construction can resume.

[0054] Step 6: System integration and construction review

[0055] 1. After completing the installation of the track (2), the pusher (6), the sensor and the limit device, perform sensor calibration and system joint debugging to ensure the real-time and accuracy of data acquisition and control instructions.

[0056] 2. During the construction process, displacement, thrust and inclination data are recorded in real time to form a construction log. After completion, the slip trajectory and correction effect are reviewed through data analysis to optimize subsequent construction parameters.

[0057] Technical Effect Verification Through the above implementation, the present invention can achieve the following effects:

[0058] The displacement synchronization accuracy is controlled within ±5mm, and the tilt angle deviation is ≤0.5°;

[0059] The axis deviation is constrained within a range of 15 mm through the coordinated action of the limiting pulley (7) and the transverse jack (9);

[0060] The multi-level early warning mechanism reduces the risk of structural instability by more than 90%, significantly improving construction efficiency and safety.

[0061] The above embodiments are only preferred implementations of the present invention. Those skilled in the art can adjust specific parameters (such as warning thresholds, sensor layout, etc.) according to actual engineering requirements, but their core control logic and correction principles still fall within the scope of protection of the present invention.

Claims

1. An intelligent synchronous control and deviation correction construction method for pushing and sliding of a large-span truss roof, characterized by: The steps include: Step 1: Sensor installation and data acquisition: A displacement sensor (11) and a pressure sensor (12) are installed at each pushing point. The displacement sensor (11) uses a high-precision laser displacement sensor with a measurement accuracy of ±0.5mm, which is used to collect the displacement data of the pushing point in real time; the pressure sensor (12) uses a strain gauge pressure sensor with a measurement accuracy of ±1%FS, which is used to collect the thrust data applied by the jack in real time. Tilt sensors (13) are installed at key locations of the roof structure, such as truss nodes and near supports. The tilt sensors are MEMS tilt sensors with a measurement accuracy of ±0.1°, which are used to monitor the tilt angle data of the roof during the jacking and sliding process. All sensors are connected to the data acquisition system, and the collected data is transmitted to the control terminal in real time; Step 2: Synchronous control: Take one of the jacking points as the reference point, and preset its sliding speed and displacement curve. The control terminal is an industrial control computer, which integrates a data processing module, a control algorithm module and a communication module. The data processing module analyzes and processes the real-time displacement data fed back by the displacement sensor (11) of each jacking point. The control algorithm module calculates the displacement deviation between each slave jacking point and the reference point based on the displacement data, and uses a preset control algorithm (such as a PID control algorithm) to generate thrust adjustment instructions for each slave jacking point. The hydraulic control system of the jack adopts a closed-loop control method. After receiving the instruction, it accurately adjusts the output of the jack so that the displacement of each slave jacking point is synchronized with the displacement of the reference point, and the displacement deviation is controlled within the preset allowable range; Step 3: Correction control: When the tilt sensor (13) detects that the tilt angle of the roof exceeds the preset normal angle range, the control terminal immediately starts the correction program. For the plane deflection of the roof, the control terminal calculates the thrust value that needs to be reduced at the pushing point on the deflected side and the thrust value that needs to be increased at the pushing point on the other side based on the tilt angle and direction through precise mechanical calculations. By adjusting the thrust difference between the pushing points on both sides, a correction torque is generated to restore the roof to a horizontal state; if the roof is twisted, the control terminal calculates the thrust size and direction that needs to be adjusted at the pushing points at different positions based on the twisting angle and the roof structure model. By accurately changing the thrust vector of each pushing point, a torsional torque is generated to correct the twisted state of the roof. During the correction process, the displacement sensor data is monitored in real time, and the displacement of the pushing point is fine-tuned to ensure that the correction process does not affect the synchronous sliding of the entire roof; Step 4: Set the limit device: Install the limit frame (8) and the limit pulley (7) on the beam. The limit frame (8) uses No. 8 I-steel as a support. The limit frame (8) is 15 mm away from the outer edge of the structure to prevent the axis from deviating during the sliding process and to correct the deviation in time. At the same time, the limit pulley (7) is installed on the limit frame to prevent the structure from being damaged due to large deviation during the sliding process. Step 5: High-precision synchronous control optimization: The central control unit continuously receives real-time displacement data fed back by the displacement sensors at each jacking point, compares the displacement of each slave jacking point with the displacement of the reference point, calculates the displacement deviation, and uses an adaptive PID control algorithm based on this deviation. This algorithm can automatically adjust the control parameters according to the actual conditions during the construction process, enhancing the accuracy and adaptability of the control. The algorithm generates thrust adjustment instructions for the jacks at each slave jacking point, and controls the hydraulic control system of the jacks to accurately change the jack output, so that the displacement of each slave jacking point quickly converges with the displacement of the reference point, and the displacement deviation is always controlled within a very small range of ±5mm, achieving high-precision synchronous control. Step 6: Multiple early warning and emergency mechanisms: Set multiple early warning thresholds for displacement deviation, thrust deviation, and tilt angle in the central control unit. The first-level early warning threshold is set close to the upper limit of the normal range, such as displacement deviation ±3mm, thrust deviation ±5%, and tilt angle ±0.3°. When the monitoring data reaches this threshold, the central control unit will send out an audible and visual early warning signal to remind on-site construction personnel to pay close attention to the construction status and prepare to take corresponding measures; the second-level danger threshold is set close to the critical value that may cause structural safety problems, such as displacement deviation ±8mm, thrust deviation ±10%, and tilt angle ±1°. Once the data reaches this threshold, the system immediately triggers an emergency response. The safety assessment in the emergency plan uses finite element analysis software to simulate and analyze the roof structure, and combines the actual on-site monitoring data to evaluate the safety and stability of the structure; Step 7: Emergency correction of deviation: Install jacks (9) on the beam, and arrange a pair of them symmetrically every 15-20m outside the track, and install them perpendicular to the track. At the same time, install a reaction frame (10) outside the beam body. When deviation occurs during the pushing process, stop pushing and use the jacks (9) to correct the deviation of the pushing component.

2. The method for synchronous control and deviation correction of the pushing and sliding of a large-span truss roof according to claim 1 is characterized in that: The displacement sensor (11) is a high-precision laser displacement sensor with a measurement accuracy of ±0.5 mm; the pressure sensor (12) is a strain gauge pressure sensor with a measurement accuracy of ±1% FS; and the inclination sensor is a MEMS inclination sensor (13) with a measurement accuracy of ±0.1°.

3. The method for synchronous control and deviation correction of the pushing and sliding of a large-span truss roof according to claim 1 is characterized in that: The control terminal is an industrial control computer, which integrates a data processing module, a control algorithm module and a communication module; the data processing module is responsible for real-time analysis and processing of data collected by the sensor; the control algorithm module runs the preset control algorithm and generates thrust adjustment instructions; the communication module realizes data transmission and instruction interaction between the control terminal and the sensor and the jack hydraulic control system.

4. The method for synchronous control and deviation correction of the pushing and sliding of a large-span truss roof according to claim 1 is characterized in that: The hydraulic control system of the jack adopts a closed-loop control method, which can accurately adjust the output thrust of the jack according to the thrust adjustment instructions sent by the control terminal; the hydraulic control system has a pressure overload protection function. When the output pressure of the jack exceeds the set safety pressure threshold, it automatically stops working to protect the safety of equipment and personnel.

5. The method for synchronous control and deviation correction of pushing and sliding of a large-span truss roof according to claim 1 is characterized in that: In the steps of establishing multiple early warning and emergency mechanisms, the early warning signals include sound and light alarm signals, which are issued through on-site alarm lights and speakers; the safety assessment in the emergency plan uses finite element analysis software to simulate and analyze the roof structure, and combines actual on-site monitoring data to evaluate the safety and stability of the structure.

6. The method for synchronous control and deviation correction of pushing and sliding of a large-span truss roof according to claim 1 is characterized in that: A jack (9) is installed on the beam, and a pair of jacks are symmetrically arranged every 15-20m outside the track. The jacks are installed perpendicular to the track and a reaction frame (10) is installed outside the beam body. When displacement occurs, the jacks (9) are used to stop the movement and correct the deviation of the moving component.

7. The method for synchronous control and deviation correction of jacking and sliding of a large-span truss roof according to claim 1 is characterized in that: A limit frame (8) and a limit pulley (7) are installed on the beam. The limit frame (8) is supported by No. 8 I-steel. The limit frame (8) is 15 mm away from the outer edge of the structure to prevent the axis from deviating during the sliding process and to correct the deviation in time. At the same time, a limit pulley (7) is installed on the limit frame to prevent the structure from being damaged due to large deviation during the sliding process.

8. The method for synchronous control and deviation correction of jacking and sliding of a large-span truss roof according to claim 1 is characterized in that: The displacement sensor (11) is installed at the sliding support points at both ends of the truss, the mid-span and the 1 / 4 node, and is used to monitor the linear displacement and synchronization error of the sliding; the inclination sensor (13) is installed at the mid-span and the key nodes at both ends of the truss (welded or bolted), and is used to monitor the overall inclination angle of the truss to prevent deformation due to uneven force; the pressure sensor (12) is installed at the top push point of the truss, and is used to monitor real-time pressure changes.

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