Integrated hydraulic lifting method, device and equipment for bidirectional large-span cantilever steel truss structures

Abstract

This invention discloses a bidirectional integrated hydraulic lifting method, device, and equipment for large-span cantilever irregular steel truss structures. The integrated hydraulic lifting method includes: pre-assembling an integrated lifting unit; forming a coordinated upper lifting point system adapted to the asymmetrical load distribution of the irregular steel truss structure; forming a temporary force-bearing system during the lifting stage; connecting the hydraulic lifters at the first and second types of upper lifting points with temporary lifting devices at the lower lifting points using steel strands to form a cable-anchor-tool connection system; lifting the integrated lifting unit; and after connecting the integrated lifting unit to the main structure at the designed position, unloading the hydraulic lifters in stages and dismantling the temporary lifting devices, reinforcing rods, and temporary lifting towers. This invention effectively solves the problems of asymmetrical force, rotation and torsion, posture deviation, and installation accuracy control during the overall lifting process of irregular steel trusses, improving the safety, installation accuracy, and construction efficiency of the overall lifting construction.

Description

Technical Field

[0001] This invention relates to the field of building construction and steel structure installation technology, and in particular to a bidirectional integrated hydraulic lifting method, device and equipment for large-span cantilever irregular steel truss structures, applicable to the overall lifting and installation of large-span cantilever irregular steel truss structures with L-shaped corners and their auxiliary systems such as curtain walls, ceilings, and equipment pipelines. Background Technology

[0002] The application of large-span cantilever irregular steel truss structures is increasing in large public buildings, mixed-use buildings, and complex corridor structures. These structures typically have characteristics such as large spans, irregular plan layouts, a large number of components, complex stresses in corner areas, and misalignment between the center of gravity and the centroid. In particular, when the structure has an L-shaped plan layout, its overall lifting and installation face even greater challenges.

[0003] In current construction practices, large-span irregular steel truss structures typically employ a segmented hoisting and high-altitude assembly method. This method has the following drawbacks: First, the high-altitude assembly work is extensive, posing a high risk to construction safety. Second, cumulative errors are easily generated at corner positions and joint nodes during segmented hoisting, affecting installation accuracy. Third, auxiliary systems such as curtain walls, ceilings, and electromechanical pipelines often need to be installed at high altitudes after the steel truss is in place, resulting in a longer construction period. Fourth, conventional synchronous lifting technology is more suitable for structures with relatively regular stress distribution and is difficult to effectively adapt to the asymmetrical loads, posture deviations, and angular torsion problems encountered during the overall lifting process of L-shaped irregular steel trusses.

[0004] In addition, existing hydraulic synchronous lifting schemes mostly focus on the synchronous vertical displacement of the lifting points as the main control objective, lacking joint monitoring and closed-loop control of the overall spatial posture of the irregular steel truss structure and the safety status of key stress-bearing parts. This makes it difficult to detect abnormal stress, local deformation and spatial posture deviation in a timely manner during the lifting process, thus affecting the safety and reliability of the overall lifting construction.

[0005] Especially in the L-shaped corner area, due to differences in the length of the cantilever on both sides, the weight distribution of the auxiliary system, and the constraint conditions of the lifting points, torsion, local warping, sudden changes in the reaction force at the lifting points, and stress concentration in local members are prone to occur during the lifting process. If only the traditional vertical synchronous control method of the lifting points is used, it is difficult to judge in a timely manner whether the monitoring data is stable or reasonable, and it is also difficult to make targeted adjustments to each hydraulic lifting device based on the monitoring results.

[0006] Therefore, there is an urgent need to provide an integrated hydraulic lifting method, device, and equipment suitable for large-span cantilever irregular steel truss structures to solve key technical problems such as lifting point layout, lifting synchronization, attitude adjustment, stress monitoring, and precise positioning. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an integrated hydraulic lifting method, device and equipment for large-span cantilever L-shaped irregular steel trusses to prevent angular torsional deformation caused by asymmetrical load distribution.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A hydraulic lifting method for a large-span cantilever irregular steel truss structure is provided, applicable to lifting a large-span cantilever irregular steel truss structure with an L-shaped corner as a whole to an installation position between two main buildings. The method includes: S1. Pre-assemble the main body of the irregular steel truss structure with at least one of the curtain wall, ceiling and equipment pipeline on the ground or low floor to form an integrated lifting unit; S2. Set up several lifting platforms on the floors or roofs of the main buildings on both sides as first-class lifting points, and set up at least one set of temporary lifting towers in the corner area of ​​the irregular steel truss structure as second-class lifting points, so as to form a coordinated lifting point system that adapts to the asymmetrical load distribution of the irregular steel truss structure. S3. Set up temporary lifting devices at the predetermined lifting nodes of the upper chord of the irregular steel truss structure, and set up reinforcing rods in the vicinity of the lifting points to form a temporary force system during the lifting stage; S4. Steel strands are used to connect the hydraulic lifters at the first type of upper lifting point and the second type of upper lifting point to the temporary lifting device at the lower lifting point, forming a cable-anchor-tool connection system; S5. Lift the integrated lifting unit to the designed position; during the lifting process, collect the strain information, spatial displacement and attitude information of the integrated lifting unit, as well as the vertical displacement information of the lifting point, and perform stability judgment, rationality judgment and joint closed-loop control based on the information to adjust the lifting speed, lifting stroke and single-point micro-momentum of each hydraulic lifting device; S6. After the integrated lifting unit is connected to the main structure at the designed position, the hydraulic lifting device is unloaded, and the temporary lifting tools, reinforcing rods and temporary lifting tower are removed.

[0009] Furthermore, the first type of lifting point is set in the main load-bearing area of ​​the main building on both sides to bear the lifting load of the main load-bearing area on both sides of the integrated lifting unit; the second type of lifting point is set in the concentrated reaction force position of the L-shaped corner area to bear the concentrated lifting reaction force of the L-shaped corner area and cooperate with attitude control.

[0010] Furthermore, the temporary lifting device at the lower lifting point is set at the lifting node determined by calculation on the upper chord of the irregular steel truss structure; the lifting node is a node with a large lifting reaction force or sensitive to attitude control.

[0011] Furthermore, the calculation is a structural calculation for the lifting stage, which includes establishing a lifting stage calculation model that includes the main body of the irregular steel truss structure, auxiliary systems, temporary lifting tools at the lower lifting points, reinforcing rods, lifting platform, and temporary lifting tower. The model calculates the lifting reaction force, member stress, node displacement, and overall attitude change at each candidate lifting point, and determines the lifting nodes based on the calculation results.

[0012] Furthermore, the reinforcing rod system includes vertical reinforcing rods and diagonal reinforcing rods. The vertical reinforcing rods are connected between the node where the temporary lifting device at the lower suspension point is located and the lower chord node below it. The diagonal reinforcing rods are connected between the node where the temporary lifting device at the lower suspension point is located and the adjacent web member node, so as to form a local spatial stability unit together with the original truss members.

[0013] Furthermore, the strain monitoring device is installed on the key load-bearing members of the temporary lifting tower, lifting platform, temporary lifting tool at the lower lifting point, and irregular steel truss structure to obtain strain change information of key load-bearing parts during the lifting process.

[0014] Furthermore, the BeiDou monitoring device is installed at the corner node, end node and mid-span node of the integrated lifting unit to obtain the three-dimensional spatial coordinates of the integrated lifting unit during the lifting process.

[0015] Furthermore, the laser rangefinder is used to monitor the relative distance between each lifting point and the reference surface in order to determine the vertical displacement difference and synchronization status of each lifting point.

[0016] Furthermore, the displacement-attitude-strain joint closed-loop control includes: a displacement control loop with the displacement difference of the lifting point as input, an attitude control loop with the spatial attitude deviation of the integrated lifting unit as input, and a safety control loop with the strain deviation of the key stress-bearing parts as input.

[0017] Furthermore, the displacement-attitude-strain joint closed-loop control calculates the target corrected displacement of each lifting point based on the displacement deviation of the lifting point and the overall attitude deviation, and determines whether to lift normally, lift at a limited speed, suspend lifting, or make single-point micro-adjustment based on the strain safety status of key stress parts.

[0018] Furthermore, the graded loading test lifting is carried out in sequence according to load levels of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100%; after the lifting unit is lifted off the ground, it stays for 2 to 24 hours, and during the stay, the reaction force at the lifting point, structural strain, spatial attitude and equipment operation status are checked.

[0019] Furthermore, when approaching the design elevation, the hydraulic lifting system switches from automatic synchronous lifting mode to single-point micro-adjustment mode, with a single-point displacement of no more than 1 cm.

[0020] The present invention also provides an integrated hydraulic lifting device for implementing the above method, and an integrated hydraulic lifting equipment for implementing the above method.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: (1) By setting up lifting platforms on both sides of the main building and setting up temporary lifting towers in the L-shaped corner area, a dual-type lifting point collaborative system is formed, which can adapt to the asymmetrical load distribution of the irregular steel truss and reduce the torsion and warping during the overall lifting process; (2) By setting up temporary lifting tools and reinforcement rods at the lower lifting point, a temporary force system matching the overall lifting conditions is established to improve the local stability and overall force safety of the lower lifting point area; (3) A joint monitoring system of displacement-attitude-strain is formed by strain monitoring, Beidou monitoring and laser ranging monitoring, and closed-loop control is implemented on this basis, which can correct the lifting deviation in real time and improve the synchronization and safety of the overall lifting process; (4) By setting the stability and rationality judgment of monitoring data, the continuity, fluctuation, trend and theoretical conformity of measured strain, spatial coordinate and lifting point displacement data can be checked, thereby avoiding incorrect adjustment due to monitoring data jumps, drifts or abnormalities; (5) By establishing a target correction displacement calculation method based on lifting point displacement deviation, attitude deviation and strain safety status, those skilled in the art can clearly determine the adjustment direction, adjustment amplitude and control status of each hydraulic lifter based on the acquired monitoring parameters; (6) By graded loading test lifting, ground-free stop verification and micro-motion attitude adjustment when approaching the design elevation, the installation accuracy and construction reliability of the overall lifting of large-span cantilever irregular steel trusses can be improved; (7) By pre-assembling the main body of the steel truss and the auxiliary system as a whole, a large number of high-altitude operations can be transferred to the ground or low-level floors, reducing the amount of high-altitude operations and improving construction efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall lifting of the steel truss structure in an embodiment of the present invention; Figure 2 The L-shaped irregular steel truss structure is shown in the embodiment of the present invention; Figure 3 This is a schematic diagram of the platform structure in the first type of lifting point in an embodiment of the present invention; Figure 4 This is a schematic diagram of the platform two structure in the first type of hanging point in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the temporary lifting tower in an embodiment of the present invention; Figure 6This is a schematic diagram of the temporary lifting tower hydraulic lifting platform structure in an embodiment of the present invention; Figure 7 This is a schematic diagram of the temporary lifting device structure at the lower lifting point in an embodiment of the present invention; Figure 8 This is a schematic diagram of the steel strand guide frame. Figure 9 This is a schematic diagram illustrating the positional relationship and guidance between the steel strand guide frame and the hydraulic lifter in an embodiment of the present invention; Figure 10 This is a flowchart of the integrated hydraulic lifting method of the present invention.

[0023] The components are: 1-Lifting platform; 2-Hydraulic lifter; 3-Embedded connection component; 4-Steel strand; 5-Temporary lifting tool for lower lifting point; 6-Reinforcing rod system; 7-Temporary lifting tower; 8-Truss lifting point; 9-Integrated lifting unit; 10-Column; 11-Frame column; 12-Rear tie rod; 13-Short column; 14-Reinforced concrete beam; 15-Connecting component; 16-Platform beam; 17-Diagonal brace; 18-Tower hydraulic lifting platform; 19-Tower main member; 20-Draping strip; 21-Connecting beam; 22-Column base conversion beam; 23-Lifting beam; 24-Platform beam; 25-Padded beam one; 26-Padded beam two; 27-Temporary tower hydraulic lifting platform; 28-Diagonal brace; 29-Support rod; 30-Auxiliary rod; 31-Guide rod; 32-Main buildings on both sides; 33-L-shaped corner area; 34-First type of lifting point; 35-Second type of lifting point; 36-Steel strand guide frame; 37-Steel strand output direction. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0025] Example 1 This embodiment provides an integrated hydraulic lifting method for a large-span cantilever irregular steel truss structure, which is suitable for lifting a large-span cantilever irregular steel truss structure with an L-shaped corner to the installation position between the two main buildings.

[0026] An integrated hydraulic lifting method for a large-span cantilever irregular steel truss structure, see [link / reference]. Figure 10 It includes the following steps: Step S1: Pre-installation of the integrated lifting unit An assembly platform is erected on the ground or a low-rise building to pre-assemble the main body of the irregular steel truss structure and its auxiliary systems, forming an integrated lifting unit 9.

[0027] In this embodiment, the steel truss structure is an L-shaped irregular steel truss structure, and the overall lifting objective is to lift the integrated lifting unit 9 to the predetermined installation position between the two main buildings. During the lifting process, such as Figure 1 The diagram shows the overall lifting of the steel truss structure, which mainly includes a lifting platform 1, a hydraulic lifting device 2, a pre-assembled structure 3, steel strands 4, temporary lifting tools 5, post-reinforcement members 6, a temporary lifting tower 7, truss lifting points 8, and an integrated lifting unit 9.

[0028] like Figure 2 As shown, the integrated lifting unit 9 is an overall structural unit to be lifted and installed, which includes at least one auxiliary system among the following: steel truss main body, curtain wall, ceiling, and equipment pipelines. The steel truss main body serves as the main load-bearing skeleton of the integrated lifting unit 9, and is composed of multiple planar trusses and connecting members forming a spatial force-bearing system. Each planar truss is formed by connecting upper chords, lower chords, web members, and node plates.

[0029] Figure 2 The diagram also shows the positional relationship between the two main buildings 32, the L-shaped corner area 33, the first type of lifting point 34, and the second type of lifting point 35. The two main buildings 32 are located on either side of the integrated lifting unit 9, providing support for the first type of lifting point 34. The L-shaped corner area 33 is located at the turning point of the integrated lifting unit 9, and is a key area for attitude and torsional control during the lifting process. The second type of lifting point 35 is arranged at the corresponding position of the L-shaped corner area 33, used to bear the concentrated lifting reaction force in the corner area and to help adjust the overall attitude.

[0030] Ancillary systems may include glass curtain wall units, ceiling systems, equipment pipelines, and their associated support components. By pre-installing ancillary systems such as curtain walls, ceilings, and equipment pipelines at corresponding positions on the steel truss on the ground or lower floors, a large amount of high-altitude work can be transferred to a lower level, improving construction safety and installation efficiency.

[0031] Step S2: Arrangement of the suspension point system The lifting point system includes a first type of lifting point and a second type of lifting point. The first type of lifting point is the lifting platform 1 set on the floor or roof of the main building on both sides; the second type of lifting point is the temporary lifting tower 7 set in the L-shaped corner area.

[0032] The first type of lifting point is used to bear the lifting load of the main load-bearing areas on both sides of the integrated lifting unit 9, while the second type of lifting point is used to bear the concentrated lifting reaction force in the L-shaped corner area and works with the first type of lifting point to achieve attitude control in the corner area. Through the coordinated arrangement of the above two types of lifting points, a lifting point system that adapts to the asymmetrical load distribution of irregular steel trusses can be formed.

[0033] The number and location of the first and second types of lifting points can be determined based on the structural calculation results of the lifting stage. During the calculation, the self-weight of the integrated lifting unit 9, the weight of the curtain wall, the weight of the ceiling, the weight of equipment pipelines, and temporary construction loads can be used as the lifting load input. Combined with the support positions provided by the main buildings 32 on both sides, the lifting point reaction forces, member stresses, node displacements, and overall posture changes under different lifting point arrangement schemes are calculated. By comparing the various arrangement schemes, the scheme with a more balanced distribution of lifting point reaction forces, less torsion in the L-shaped corner area, and sufficient stress in key members is selected as the final lifting point arrangement scheme.

[0034] (1) Improve the structural layout of the platform Depending on the available load-bearing parts of the main building and the installation space conditions, the lifting platform 1 includes platform 1a and platform 1b. Platform 1a is suitable for areas with column support above the floor or roof of the main building; platform 1b is suitable for areas with limited space at the edge beams, lateral load-bearing components, or roof edges of the main building. Both platform 1a and platform 1b can serve as first-class lifting points for installing the hydraulic lifting device 2 and bearing the lifting load of the integrated lifting unit 9.

[0035] like Figure 3 As shown, platform 1a includes a hydraulic lifter 2, a frame column 11, a rear tie rod 12, a short column 13, a platform beam 16, a column 10, a diagonal brace 17, a connecting component 15, and a pre-embedded docking component 3. The column 10 is fixed to the reinforced concrete beam 14, the short column 13 is located on the rear side of the column 10, the platform beam 16 is horizontally located on the upper end of the column 10, the diagonal brace 17 connects the lower part of the outer end of the platform beam 16 to the lower part of the column 10, the rear tie rod 12 connects the short column 13 to the column 10, the connecting component 15 connects the end of the platform beam 16 to the reinforced concrete beam 14, and the hydraulic lifter 2 is installed on the platform beam 16.

[0036] like Figure 4 As shown, platform 2 1b includes a hydraulic lifter 2, a platform beam 16, a diagonal brace 17, a connecting component 15, and a pre-embedded docking component 3. The platform beam 16 is fixed to the side of the reinforced concrete beam 14. The diagonal brace 17 connects the lower part of the outer end of the platform beam 16 to the lower part of the reinforced concrete beam 14. The connecting component 15 connects the outer end of the platform beam 16 to the reinforced concrete beam 14. The hydraulic lifter 2 is installed on the platform beam 16.

[0037] By setting up Platform 1a and Platform 2b, the form of the lifting platform can be flexibly selected according to the load-bearing conditions of different parts of the main building, avoiding the limitation of the arrangement of lifting points due to different boundary conditions of the main structure.

[0038] (2) Structural layout of temporary lifting tower 7 like Figure 5As shown, the temporary lifting tower 7 includes a tower hydraulic lifting platform 18, tower main members 19, tie rods 20, connecting beams 21, and column base transfer beams 22. Preferably, there are three tower main members 19 arranged in a triangular pattern. The column base transfer beams 22 are located at the lower end of the tower main members 19, and the tower hydraulic lifting platform 18 is located at the upper end of the tower main members 19. Tie rods 20 connect each tower main member 19, and connecting beams 21 connect adjacent tower hydraulic lifting platforms 18 to improve overall stability and resistance to progressive collapse. The column base transfer beams 22 connect the temporary lifting tower 7 to the foundation platform.

[0039] like Figure 6 As shown, the temporary tower hydraulic lifting platform 27 includes a hydraulic lifting device 2, a lifting beam 23, a platform beam 24, a first pad beam 25, and a second pad beam 26. The second pad beam 26 is mounted on the tower hydraulic lifting platform 18, the first pad beam 25 is mounted on the second pad beam 26, the platform beam 24 is mounted on the first pad beam 25, the lifting beam 23 is mounted on the platform beam 24, and the hydraulic lifting device 2 is mounted on the lifting beam 23.

[0040] The temporary lifting tower 7, as the second type of lifting point, is positioned corresponding to the L-shaped corner area 33. Since the L-shaped corner area 33 usually has problems of concentrated lifting reaction force and spatial attitude sensitivity, the temporary lifting tower 7 not only bears the vertical lifting load, but is also used to correct the angular torsion and overall attitude deviation of the integrated lifting unit 9 by adjusting the lifting stroke of the corresponding hydraulic lifting device 2.

[0041] Step S3: Configuration of the lower suspension point system and reinforcement rod system Temporary lifting devices 5 are installed at the calculated lifting nodes on the upper chord of the irregular steel truss structure, such as... Figure 7 As shown. The lifting node is a node with a large lifting reaction force or sensitive to attitude control. The temporary lifting device 5 at the lower lifting point is preferably a corbel structure formed by welding steel plates and reliably connected to the upper chord of the truss.

[0042] "Determined by calculation" specifically refers to: before the lifting construction, establishing a lifting stage calculation model that includes the main body of the irregular steel truss structure, curtain wall, ceiling, equipment pipelines, temporary lifting tools 5 for the lower lifting point, reinforcement rod system 6, lifting platform 1 and temporary lifting tower 7; applying the self-weight of the steel truss structure, the weight of the auxiliary system, the lifting load and the temporary construction load to the calculation model, and calculating the lifting reaction force of each candidate lifting point, the vertical displacement of the node, the stress of the member, the rotation angle of the node and the overall posture change.

[0043] A candidate lifting point can be designated as a predetermined lifting node when it meets at least one of the following conditions: First, the lifting reaction force of the lifting point is greater than the average lifting reaction force of all candidate lifting points; second, the lifting point is located in an L-shaped corner area or a cantilever end area; third, the lifting point has a significant impact on the overall attitude change of the integrated lifting unit 9; fourth, the stress change of the members near the lifting point is significant, requiring local deformation control through lifting point constraints. Determining the lower lifting point position through the above calculations ensures that the arrangement of the lower lifting points matches the structural stress characteristics and attitude control requirements.

[0044] To ensure local stability and overall structural safety in the lower lifting point area during the lifting process, a reinforcing rod system 6 is installed in the vicinity of the lower lifting point. The vertical reinforcing rod 6 is connected between the node where the temporary lifting device 5 is located at the lower lifting point and the lower chord node below it, forming a local spatial stability unit with the original truss members to prevent local instability or excessive deformation in the lifting point area during the lifting process.

[0045] The arrangement of the reinforcement system 6 can also be determined based on the calculation results of the lifting stage. When the calculation results show that the stress of the members near a certain lifting point is large, the nodal displacement is large, or the local stability reserve is insufficient, vertical reinforcement bars, diagonal reinforcement bars, or a combination of both are added in that area to improve the local stiffness and spatial stability near the lifting point.

[0046] Step S4: Establishment of the cable-anchor-equipment connection system Steel strand 4 is used as a flexible load-bearing sling. The upper end of steel strand 4 is connected to hydraulic lifting device 2, and the lower end is connected to temporary lifting device 5 at the lower lifting point through bottom anchor, forming a cable-anchor-tool connection system. Steel strand 4 is preferably made of high-strength, low-relaxation prestressed steel strand, and hydraulic lifting device 2 is preferably a core-through type hydraulic lifting device, equipped with wedge-shaped anchors.

[0047] The hydraulic lifter 2 is connected to the hydraulic pump power system, and performs lifting, holding, and fine-tuning under the action of the hydraulic pump power system. The hydraulic pump power system preferably adopts a modular structure, with each module controlling one set of hydraulic lifters 2 to adapt to lifting conditions with different numbers of lifting points and spatial distribution.

[0048] To ensure smooth output of the steel strand 4 during the lifting process, a steel strand guide frame 36 is installed on the steel strand output side of the hydraulic lifter 2. For example... Figure 8 As shown, the steel strand guide frame 36 includes a diagonal brace 28, a support rod 29, an auxiliary rod 30, and a guide rod 31. The support rod 29 is fixed to the platform beam 16 or its adjacent supporting component. The diagonal brace 28 connects the support rod 29 to the platform beam 16 to improve the overall stability of the steel strand guide frame 36. The auxiliary rod 30 connects the support rod 29 to the guide rod 31. The guide rod 31 is located above or to the side of the hydraulic lifter 2 and is arranged obliquely along the discharge direction of the extended section of the steel strand 4. Figure 9As shown, the hydraulic lifter 2 is installed on the platform beam 16 of the lifting platform 1. After the steel strand 4 passes through the hydraulic lifter 2 vertically, its extended section enters the steel strand guide frame 36 located behind or to the side rear of the hydraulic lifter 2.

[0049] After the steel strand 4 exits from the hydraulic lift 2, it is discharged along the steel strand discharge direction 37 defined by the guide rod 31 to the side away from the operating area of ​​the hydraulic lift 2. This arrangement clarifies the relative positional relationship between the steel strand guide frame 36 and the hydraulic lift 2, ensuring that the steel strand 4 is smoothly discharged in the predetermined direction during the lifting process. This prevents the steel strand 4 from accumulating, bending, or interfering with the opening and closing of the anchorages on the top of the hydraulic lift 2, near the platform beam 16, or in the operating passage, thereby improving the safety and continuity of the hydraulic lifting operation.

[0050] Step S5: Joint monitoring and closed-loop control of displacement, attitude, and strain Before and during the formal lifting of the integrated lifting unit 9, the control system, based on feedback data from the strain monitoring device, the Beidou monitoring device, the laser rangefinder, and the hydraulic lifter, performs graded loading test lifting, ground-based stop verification, overall synchronous lifting, attitude adjustment, and fine-tuning positioning of the integrated lifting unit 9.

[0051] S51: Graded Loading Trial Lifting Before the formal overall lifting, a staged loading trial lifting is conducted. Preferably, the loading is carried out sequentially according to the theoretical lifting total load of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%.

[0052] After each level of load is applied, the system enters a holding state and remains in this state for a predetermined time to check the working status of each hydraulic lifting device 2, steel strand 4, temporary lifting point 5, lifting platform 1, temporary lifting tower 7, and reinforcing rod system 6.

[0053] Under each load level, the control system collects vertical displacement of each lifting point, strain of key stress-bearing parts, spatial coordinates of Beidou monitoring points, and pressure and stroke data of the hydraulic lifter, and stores the collected data as a monitoring data set for that load level.

[0054] Once the load reaches 100% and the integrated lifting unit 9 is completely detached from the support frame, the unit continues to lift a preset distance, bringing it into a ground-free dwell state. Preferably, the ground-free dwell time is 2 to 24 hours, more preferably 24 hours.

[0055] S52: Judgment of the stability and reasonableness of monitoring data During the graded loading test lift and the ground-based stay, complete the following verification tasks: (1) Check whether there are any abnormal deformations, cracks or loosening of the temporary lifting device 5, the reinforcing rod system 6 and the steel truss connection nodes at the lower lifting point; (2) Check whether there is abnormal settlement, cracking or local instability in the lifting platform 1, temporary lifting tower 7 and related connection nodes; (3) Check the working status of hydraulic lifter 2, steel strand 4, anchorage and hydraulic pipeline; (4) Verify the stability and rationality of strain monitoring data, Beidou monitoring data and laser ranging data; (5) Compare the monitoring data with the theoretical analysis results to determine whether the overall improvement conditions are met.

[0056] The stability assessment of the monitoring data includes: within a preset time window, determining whether the variation amplitude of the strain value, spatial coordinate value, and suspension point displacement value continuously collected at the same measuring point is less than the corresponding preset stability threshold. Specifically, the strain change rate of key stress-bearing parts, the spatial coordinate change rate of the BeiDou monitoring point, and the displacement change rate of the suspension point laser ranging can be calculated respectively; when all of the above change rates are less than the corresponding preset stability threshold, the monitoring data is determined to meet the stability requirements; when any monitoring data shows a continuous increase, abrupt change, a jump, or exceeds the preset alarm threshold, the monitoring data is determined to not meet the stability requirements.

[0057] The rationality assessment of monitoring data includes: comparing strain monitoring data with theoretically calculated strain values ​​during the lifting phase; comparing spatial coordinates obtained from BeiDou monitoring with design attitude coordinates; and comparing the displacement of the lifting point obtained from laser ranging with the target lifting displacement of the corresponding lifting point. When the strain deviation, attitude deviation, and lifting point displacement deviation are all less than the corresponding preset allowable deviations, the monitoring data is deemed to meet the rationality requirements; when the deviation between any monitoring data and the theoretically calculated value or target control value exceeds the corresponding preset allowable deviation, the monitoring data is deemed not to meet the rationality requirements.

[0058] When monitoring data fails to meet stability requirements, the control system pauses or reduces the lifting speed and prompts the operator to check the monitoring equipment, hydraulic lifter, steel strand, anchorage, and related connection nodes. When monitoring data fails to meet reasonableness requirements, the control system performs speed limiting, pause, reverse fine-tuning, or recalibration based on the type of deviation.

[0059] Based on the above stability and rationality assessments, it can be confirmed whether the lifting platform 1, temporary lifting tower 7, temporary lifting device 5 at the lower lifting point, reinforcing rod system 6, steel strand 4, hydraulic lifting device 2, and integrated lifting unit 9 meet the formal lifting conditions. Only after the above checks and verifications meet the requirements can the formal overall lifting phase begin.

[0060] S53: Displacement-Attitude-Strain Joint Closed-Loop Control Algorithm During the overall synchronous lifting process, the control system collects monitoring data according to the preset control cycle, and calculates the corrected displacement of each lifting point target based on the lifting point displacement deviation, overall attitude deviation and strain safety status.

[0061] Let the first The measured vertical displacement of each lifting point is , No. The target vertical displacement of each lifting point is Then the first The displacement deviation of each lifting point is:

[0062] in, For the first Displacement deviation of each lifting point. When A value greater than 0 indicates that the lifting point is ahead of the target position; when... A value less than 0 indicates that the lifting point lags behind the target position.

[0063] Let the measured attitude angle of the integrated lifting unit 9 obtained by the Beidou monitoring device be... The designed attitude angle is Then the attitude deviation is:

[0064] in, This is used to characterize the overall tilt or torsional deviation of the integrated lifting unit 9 relative to its design attitude. For L-shaped irregular steel truss structures, the attitude angle can be calculated based on the three-dimensional spatial coordinates of BeiDou monitoring points arranged at corner nodes, end nodes, and mid-span nodes.

[0065] Let the measured strain value of the j-th critical stress-bearing part be... The allowable strain value is Then the strain safety factor of the j-th critical stress-bearing part is:

[0066] in, Used to determine the strain safety status of critical stress-bearing components. When When the value is small, it indicates that the critical stress-bearing part is in a safe state; when When the value approaches or exceeds the preset safety threshold, it indicates that there is a risk of abnormal stress or insufficient safety reserve in the critical stress-bearing part.

[0067] The control system calculates the target correction displacement of the i-th lifting point based on the displacement deviation and attitude deviation:

[0068] in, For the first The target correction displacement of each lifting point This is the control coefficient for the lifting point displacement. For attitude control coefficients, For the first The influence coefficient of each suspension point on the overall attitude change. It can be determined based on the finite element calculation results of the lifting stage or the measured feedback data during the graded loading test lifting. , and It is not limited to a fixed constant and can be determined based on the structural calculation results of the lifting stage, the performance parameters of the lifting equipment, the arrangement of the lifting points, and the measured feedback data during the staged loading test lifting.

[0069] It is mainly used to control the correction strength for displacement deviation of the lifting points. During project implementation, it can be taken first... =0.5~1.0; when the displacement deviation of the lifting point needs to be quickly converged, A larger value can be chosen; however, when the structural stiffness is low and the lifting process is sensitive to local deformation, A smaller value can be selected to avoid sudden changes in local stress caused by excessively rapid adjustment of the hydraulic lifter.

[0070] It is mainly used to control the correction strength of overall attitude deviation. During engineering implementation, it can be taken first... =0.3~0.8; when the L-shaped corner area is torsionalally sensitive or the overall attitude deviation has a significant impact on the installation accuracy, The size can be increased appropriately; when the attitude deviation is small or when vertical synchronization control of the suspension points is the main method, It can be reduced appropriately.

[0071] Used to reflect the The degree of influence of each lifting point on the overall posture change of the integrated lifting unit. It can be determined through finite element calculations during the lifting phase, or through measured feedback data during the staged loading trial lifting. Specifically, it can be determined for the first... Apply a unit vertical displacement or a unit lifting stroke to each lifting point, calculate or measure the change in attitude angle of the integrated lifting unit, and use this change in attitude angle as the attitude influence coefficient of that lifting point. The suspension points near the L-shaped corner area or the end of the cantilever have a significant impact on the overall attitude change. Typically larger; suspension points closer to areas with higher overall structural rigidity have less impact on overall attitude changes. Typically smaller.

[0072] Before the formal overall upgrade, monitoring data from the phased loading and trial upgrade stage can be used to... , and Make corrections. When the actual lifting point displacement deviation converges slowly, appropriately increase... When the overall attitude deviation correction is insufficient, appropriately increase... When the attitude change after a minor adjustment of a certain lifting point is inconsistent with the calculated result, the corresponding attitude change of that lifting point should be corrected again based on the actual measured attitude change. .

[0073] when When the displacement is less than the first preset safety threshold, the control system corrects the displacement according to the target. Adjust the corresponding hydraulic lifter 2; when When the value is greater than or equal to the first preset safety threshold and less than the second preset safety threshold, the control system reduces the lifting speed of the corresponding hydraulic lifter 2; when When the load is greater than or equal to the second preset safety threshold, the control system pauses the lifting and prompts the operator to perform a structural stress check.

[0074] Within each control cycle, the first The target lifting speed of the hydraulic lifter 2 Determine as follows:

[0075] in, To preset the synchronous boost speed, To control the cycle. When When the speed is greater than the preset maximum speed, the preset maximum speed is used; when... When the lifting speed is less than the preset minimum lifting speed, the preset minimum lifting speed is used. Through this method, the lifting speed and lifting stroke of the hydraulic lifter 2 at each lifting point can be adjusted in real time.

[0076] Through the above algorithm, the control system can clearly determine whether each lifting point should be raised, paused, speed limited, or finely adjusted based on the actual strain, BeiDou spatial coordinates, and laser ranging displacement parameters, thereby avoiding the problem of adjustment lag or unclear adjustment direction caused by relying solely on human experience.

[0077] S54: Overall Synchronous Improvement After the ground-based calibration confirmed that there were no abnormalities, the formal overall lifting was initiated. During the overall lifting process, the control system kept each lifting point synchronized based on laser ranging data, corrected the overall spatial attitude of the integrated lifting unit 9 based on Beidou monitoring data, and controlled the safety status of key stress-bearing parts based on strain monitoring data.

[0078] When a certain lifting point is ahead of other lifting points, reduce or stop the lifting speed of the hydraulic lifter 2 at that lifting point; when a certain lifting point is behind other lifting points, increase the lifting speed of the hydraulic lifter 2 at that lifting point or perform single-point micro-movement lifting on that lifting point; when the L-shaped corner area 33 shows posture deviation or torsion trend, prioritize adjusting the hydraulic lifter 2 corresponding to the second type of upper lifting point 35, and cooperate with the first type of upper lifting point 34 to perform posture correction.

[0079] During the overall synchronous lifting process, the control system takes the vertical displacement synchronization of the lifting points as the basis, the overall attitude control of the integrated lifting unit 9 as the goal, and the strain safety control of key stress parts as the constraint, and performs coordinated control of the hydraulic lifting devices 2 of each lifting point.

[0080] S55: Fine-tuning and positioning when approaching the design elevation When the integrated lifting unit 9 approaches the design elevation, the hydraulic lifting system switches from automatic synchronous lifting mode to single-point micro-adjustment mode. The relative height difference between each lifting point is monitored by a laser rangefinder, and the overall attitude of the integrated lifting unit 9 is monitored by a Beidou monitoring device. The micro-adjustment stroke of each corresponding hydraulic lifter 2 is adjusted sequentially to ensure the integrated lifting unit 9 reaches the design attitude and elevation.

[0081] Preferably, the amount of a single micro-adjustment is no more than 1 cm. After each single-point micro-adjustment, strain, spatial coordinates, and lifting point displacement data are re-acquired, and it is determined whether the adjusted strain state, spatial attitude, and lifting point synchronization state meet the requirements. If the requirements are met, the connection and fixing process begins; if the requirements are not met, the next round of micro-adjustment continues.

[0082] Step S6: Connection and fixation, system closure and staged unloading Once the integrated lifting unit 9 has been raised to the designed position, the hydraulic lifting system is paused, and the current aerial posture is maintained. The integrated lifting unit 9 is then connected and secured to the main structure, gradually forming a stable load-bearing system.

[0083] Preferably, the integrated lifting unit 9 and the main structure are connected by a method of initial positioning connection followed by rigid connection. First, the initial positioning and temporary constraint between the integrated lifting unit 9 and the main structure are achieved through preset docking nodes, so that the lifting unit can lock its spatial position while maintaining its designed posture. Then, the final rigid connection is completed by welding, bolting, or a combination of welding and bolting, so that the integrated lifting unit 9 and the main structure form a stable overall force-bearing system.

[0084] After the connection and fixation are completed and the structural system is confirmed to be closed, the hydraulic lifting system unloads the load step by step according to the preset load levels, gradually transferring the lifting load to the permanent support system. Preferably, the unloading sequence is 95%, 90%, 80%, 70%, 60%, 50%, 40%, and 20%. During each unloading stage, strain monitoring data, BeiDou monitoring data, and laser ranging data are continuously collected to determine whether the stress transfer process of the structure is smooth and to verify whether the overall attitude and strain of key parts are within the allowable range.

[0085] During the graded unloading process, if there is a sudden change in strain at key stress points, abnormal rebound in lifting point displacement, or changes in the spatial coordinates of Beidou monitoring points exceeding the preset allowable deviation, unloading will be suspended and the structural system will be reviewed. Unloading can only continue after monitoring results show that the load transfer is smooth and the load of the integrated lifting unit 9 has been stably transferred to the permanent support system.

[0086] Once the monitoring results indicate that the load of the integrated lifting unit 9 has been stably transferred to the permanent support system, the steel strand 4 is completely relaxed. The hydraulic lifting device 2, steel strand 4, temporary lifting tool 5 at the lower lifting point, reinforcing rod system 6, and temporary lifting tower 7 are then removed in sequence to complete the integrated lifting and installation of the large-span cantilever irregular steel truss structure.

[0087] Example 2: Integrated hydraulic lifting device This embodiment provides an integrated hydraulic lifting device for implementing the above method, including a lifting platform 1, a temporary lifting tower 7, a hydraulic lifter 2, a temporary lifting tool at the lower lifting point 5, steel strands 4, a bottom anchor, a reinforcing rod system 6, a steel strand guide frame 36, a monitoring module, and a control module.

[0088] The lifting platform 1 is located on the main building and serves as the first type of lifting point; the temporary lifting tower 7 is located in the corresponding area of ​​the L-shaped corner and serves as the second type of lifting point; the hydraulic lifter 2 is installed on the lifting platform 1 and / or the temporary lifting tower 7 respectively; the temporary lifting device 5 at the lower lifting point is located at the predetermined lifting node of the upper chord of the irregular steel truss structure; the steel strand 4 and the bottom anchor connect the hydraulic lifter 2 and the temporary lifting device 5 at the lower lifting point; the reinforcing rod system 6 is used to form a temporary force-bearing system during the lifting stage; the steel strand guide frame 36 is located on the steel strand output side of the hydraulic lifter 2 and is used to limit the output direction of the extended section of the steel strand 4; the monitoring module includes a strain monitoring device, a Beidou monitoring device, and a laser rangefinder; the control module is used to receive data from the monitoring module and control the hydraulic lifter 2 to perform synchronous lifting, attitude adjustment, and micro-motion positioning.

[0089] The control module is also used to judge the stability and rationality of the monitoring data, and to calculate the corrected displacement of each lifting point and the lifting speed of the target based on the displacement deviation of the lifting point, the overall attitude deviation and the strain safety status of the key stress parts.

[0090] When the control module determines that a certain lifting point is ahead, it controls the corresponding hydraulic lifter 2 to reduce the lifting speed or stop lifting; when the control module determines that a certain lifting point is behind, it controls the corresponding hydraulic lifter 2 to increase the lifting speed or perform single-point micro-movement lifting; when the control module determines that the strain safety factor of the key stress part reaches the preset safety threshold, it controls the hydraulic lifting system to limit the speed or stop and issues an alarm prompt.

[0091] Example 3: Integrated Hydraulic Lifting Equipment This embodiment provides an integrated hydraulic lifting device for a large-span cantilever irregular steel truss structure, including a hydraulic lifter, a hydraulic pump source system, a controller, a strain monitoring device, a Beidou monitoring device, a laser rangefinder, and a human-machine interaction terminal.

[0092] The controller is connected to the hydraulic lifter, hydraulic pump power system, strain monitoring device, Beidou monitoring device and laser rangefinder respectively. It is used to adjust the lifting stroke and lifting speed of each hydraulic lifter according to strain information, spatial displacement information and lifting point displacement information, so as to realize the synchronous lifting, attitude adjustment and fine-tuning of the integrated lifting unit.

[0093] Specifically, the controller receives data collected by the strain monitoring device, the Beidou monitoring device, and the laser rangefinder according to a preset control cycle, and calculates the vertical displacement deviation of the lifting point, the overall attitude deviation, and the strain safety factor of the key stress parts. Based on the calculation results, the controller determines the target corrected displacement and target lifting speed of each hydraulic lifter and sends control commands to the hydraulic pump source system.

[0094] The hydraulic pump power system preferably adopts a modular structure, with each module controlling a set of hydraulic lifters to adapt to lifting conditions with different numbers and spatial distributions of lifting points. The human-machine interface terminal is used to display the displacement of each lifting point, overall attitude, strain status, and equipment operating status, and allows operators to issue start, pause, speed limit, and fine-tuning commands.

[0095] The human-machine interface terminal is also used to display the stability judgment results and rationality judgment results of the monitoring data, the target correction displacement of each lifting point, the target lifting speed and the alarm status, so that the operator can intuitively grasp the force status, spatial attitude and lifting point synchronization status of the integrated lifting unit 9 during the lifting process.

Claims

1. A bidirectional integrated hydraulic lifting method for a large-span cantilever irregular steel truss structure, characterized in that: Includes the following steps: S1. Pre-assemble the main body of the irregular steel truss structure with at least one of the curtain wall, ceiling and equipment pipeline on the ground or low floor to form an integrated lifting unit; S2. Set up several lifting platforms on the floors or roofs of the main buildings on both sides as first-class lifting points, and set up at least one set of temporary lifting towers in the corner area of ​​the irregular steel truss structure as second-class lifting points, so as to form a coordinated lifting point system that adapts to the asymmetrical load distribution of the irregular steel truss structure. S3. Set up temporary lifting devices at the predetermined lifting nodes of the upper chord of the irregular steel truss structure, and set up reinforcing rods in the vicinity of the lifting points to form a temporary force system during the lifting stage; S4. Steel strands are used to connect the hydraulic lifters at the first type of upper lifting point and the second type of upper lifting point to the temporary lifting device at the lower lifting point, forming a cable-anchor-tool connection system; S5. Lift the integrated lifting unit to the designed position; During the lifting process, monitoring data from the integrated lifting unit is collected. This monitoring data includes at least strain information of key stress-bearing parts obtained by a strain monitoring device, spatial displacement and attitude information obtained by a BeiDou monitoring device, and vertical displacement information of each lifting point obtained by a laser rangefinder. Based on this monitoring data, the lifting speed, lifting stroke, and single-point micro-motion of the hydraulic lifting device at each lifting point are adjusted. S6. After the integrated lifting unit is connected to the main structure at the designed position, the hydraulic lifting device is unloaded in stages, and the temporary lifting tools, reinforcing rods and temporary lifting tower are removed.

2. The integrated hydraulic lifting method according to claim 1, characterized in that, Step S5 includes: S51. Perform graded loading and trial lifting according to the preset load level, maintain the preset dwell time after the integrated lifting unit is off the ground, and check the structural stress state, spatial attitude and lifting point synchronization based on the monitoring data; S52. During the graded loading test lifting and ground-free stopping process, collect data on the vertical displacement of each lifting point, the overall spatial posture, the strain of key stress-bearing parts, and the working status of the hydraulic lifting device, and make stability and rationality judgments on the monitoring data; S53. Once the monitoring data meets the requirements for stability and rationality, the integrated lifting unit shall be simultaneously lifted as a whole. S54. During the overall synchronous lifting process, calculate the target corrected displacement of each lifting point based on the vertical displacement deviation of the lifting points, the overall attitude deviation, and the strain safety status of key stress-bearing parts; S55. Adjust the lifting speed and lifting stroke of the corresponding hydraulic lifter according to the target correction displacement; S56. When the integrated lifting unit approaches the design elevation, the hydraulic lifting system switches from synchronous lifting mode to single-point micro-adjustment mode; the relative height difference of each lifting point is monitored by a laser rangefinder, and the overall attitude of the integrated lifting unit is monitored by a Beidou monitoring device. The micro-adjustment stroke of the corresponding hydraulic lifting device is adjusted one by one so that the integrated lifting unit reaches the design attitude and design elevation.

3. The integrated hydraulic lifting method according to claim 2, characterized in that, In step S51 and step S52, the stability judgment of the monitoring data includes: Within a preset time window, determine whether the change amplitude of strain value, spatial coordinate value and suspension point displacement value continuously collected at the same measuring point is less than the corresponding preset stability threshold. When the strain change rate of the key stress-bearing parts, the spatial coordinate change rate of the Beidou monitoring point, and the displacement change rate of the laser ranging point are all less than the corresponding preset stability threshold, the monitoring data is determined to meet the stability requirements. When any measurement point data shows a continuous increase, a sudden change, a jump, or exceeds the preset alarm threshold, it is determined that the monitoring data does not meet the stability requirements, and the increase is paused or the increase speed is reduced.

4. The integrated hydraulic lifting method according to claim 2, characterized in that, In step S52, the reasonableness judgment of the monitoring data includes: The strain monitoring data was compared with the theoretically calculated strain value during the lifting stage; the spatial coordinates obtained by BeiDou monitoring were compared with the design attitude coordinates; and the displacement of the lifting point obtained by laser ranging was compared with the target lifting displacement of the corresponding lifting point. When the strain deviation, attitude deviation, and lifting point displacement deviation are all less than the corresponding preset allowable deviations, the monitoring data are deemed to meet the reasonableness requirements. When the deviation between any monitoring data and the theoretical calculated value or target control value exceeds the corresponding preset allowable deviation, the monitoring data is determined to be unreasonable, and speed limit, pause, reverse fine adjustment or re-verification are performed according to the deviation type.

5. The integrated hydraulic lifting method according to claim 2, characterized in that, In step S54, the target correction displacement of each lifting point is determined according to the following method: Let the first The laser ranging displacement deviation at each suspension point is: The attitude deviation of the integrated lifting unit is , No. The strain safety factor of each key stress-bearing component is ,in For the first The ratio of the measured strain value to the allowable strain value at key stress points; Based on the displacement deviation of the lifting point and attitude deviation Calculate the first Corrected displacement of each lifting point : in, This is the control coefficient for the lifting point displacement. This refers to the attitude control coefficient. For the first The influence coefficient of each lifting point on the attitude change of the integrated lifting unit; Determined based on the synchronous control accuracy of the lifting points. Determined based on the attitude control requirements of the integrated lifting unit. Determined based on the finite element calculation results of the lifting phase or the measured feedback data during the graded loading test lifting; when When the displacement is less than the first preset safety threshold, the correction displacement is performed accordingly. Adjustment One hydraulic lifter; when When the lifting speed of the corresponding hydraulic lifter is reduced when the lifting speed is greater than or equal to the first preset safety threshold and less than the second preset safety threshold; when If the value is greater than or equal to the second preset safety threshold, the lifting is paused and the structural stress is checked.

6. The integrated hydraulic lifting method according to claim 5, characterized in that, No. The target lifting speed of the hydraulic lifter Determine using the following method: in, To preset the synchronous boost speed, This is the corrected displacement for the i-th lifting point. To control the cycle; when If the speed exceeds the preset maximum speed, the preset maximum speed will be used. when When the speed is less than the preset minimum lifting speed, the preset minimum lifting speed shall be used. When the When one lifting point is ahead of other lifting points, lower or pause the first lifting point. The lifting speed of each hydraulic lifter; When the When a lifting point lags behind other lifting points, improve the first lifting point. The lifting speed of a hydraulic lifter or the single-point micro-lifting of the lifting point.

7. The integrated hydraulic lifting method according to claim 1, characterized in that, The predetermined hoisting node is determined through structural calculations for the lifting stage, which include the following steps: Establish a calculation model for the lifting stage, including the main body of the irregular steel truss structure, auxiliary systems, temporary lifting tools at the lower lifting point, reinforcement rod system, lifting platform, and temporary lifting tower; The self-weight of the steel truss structure, the weight of the auxiliary systems, the lifting load, and the temporary construction load are applied to the calculation model. Calculate the lifting reaction force, node displacement, member stress, and overall attitude change for each candidate hoisting node; The nodes with large lifting reaction forces, significant impact on overall posture changes, or concentrated stress locations in the L-shaped corner area are selected as the predetermined hoisting nodes.

8. The integrated hydraulic lifting method according to claim 1, characterized in that, The cable-anchor-tool connection system also includes a steel strand guide frame, which is located on the steel strand output side of the hydraulic lift and behind or to the side rear of the hydraulic lift. The steel strand guide frame includes a support rod, a diagonal brace, an auxiliary rod, and a guide rod. The guide rod is arranged obliquely along the discharge direction of the steel strand extension section to limit the discharge direction of the steel strand after it passes through the hydraulic lift, so that the steel strand is discharged in a direction away from the operating area of ​​the hydraulic lift.

9. An integrated hydraulic lifting device for implementing the method of any one of claims 1 to 8 for a large-span cantilever irregular steel truss structure, characterized in that, include: The lifting platform is set on the main building and used as a first-type lifting point; A temporary lifting tower is set up in the area corresponding to the L-shaped corner and used as a second type of lifting point; Hydraulic lifting devices are respectively installed on the lifting platform and / or temporary lifting tower; The temporary lifting device at the lower lifting point is set at the predetermined lifting node on the upper chord of the irregular steel truss structure; Steel strands and bottom anchors are used to connect the hydraulic lifter to the temporary lifting device at the lower lifting point; Reinforcing rods are used to form a temporary load-bearing system during the lifting phase; A steel strand guide frame is installed on the steel strand output side of the hydraulic lifter; The monitoring module includes a strain monitoring device, a BeiDou monitoring device, and a laser rangefinder; The control module is used to receive data from the monitoring module and control the synchronous lifting, attitude adjustment and micro-positioning of each hydraulic lifter; The control module is also used to calculate the target correction displacement of each lifting point based on strain information, spatial displacement and attitude information, and vertical displacement information of the lifting point, and to control each hydraulic lifter to perform synchronous lifting, attitude adjustment, speed limit control, pause control and single-point micro-motion positioning.

10. An integrated hydraulic lifting device for a large-span cantilever irregular steel truss structure, characterized in that, It includes a hydraulic lifter, a hydraulic pump source system, a controller, a strain monitoring device, a Beidou monitoring device, a laser rangefinder, and a human-machine interface terminal; The controller is connected to the hydraulic lifter, the hydraulic pump source system, the strain monitoring device, the Beidou monitoring device, the laser rangefinder, and the human-machine interaction terminal, respectively. The controller is used to calculate the target corrected displacement and target lifting speed of each hydraulic lifter based on the vertical displacement deviation of the lifting point, the overall posture deviation, and the strain safety status of the key stress parts, and to control the hydraulic pump power system to adjust the lifting stroke and lifting speed of each hydraulic lifter.

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