Intelligent hanging basket construction method and system under highly restricted conditions

Abstract

The application discloses a kind of highly restricted conditions under intelligent hanging basket construction method, specifically including the following steps: S100, complete support foundation, column, truss, distribution beam and the erection of work platform, synchronous layout settlement observation point and determine initial elevation;S200, hoist river side bottom basket component, sequentially complete track, main truss, anchoring device, flat link piece core structure installation;S300, symmetrically complete side span hanging basket installation, install pre-press reaction frame and complete hanging basket pre-press detection;S400, according to the sequence of bridge deck, distribution beam, truss, column, gradually remove support, cut off site embedded part, pull out support foundation pile body;S500, carry out comprehensive detailed inspection, carry out cantilever casting segment reinforcement binding, prestressed pipe installation. By adopting support erection, hanging basket installation, intelligent pre-press, support removal, cantilever casting integrated construction scheme, the problem that traditional hanging basket installation cannot be implemented under the condition of high-voltage line, adjacent traffic trunk line and other multi-dimensional restricted environment, high safety risk is solved.

Description

Technical Field

[0001] This invention belongs to the field of intelligent hanging basket technology, and more specifically, relates to an intelligent hanging basket construction method and system under highly restricted conditions. Background Technology

[0002] With the rapid development of modern bridge engineering, the cantilever construction method is widely used in the construction of continuous beam bridges spanning rivers, lakes, and existing transportation lines. The hanging basket, as the core equipment in cantilever construction, is a mobile scaffolding and formwork support system capable of moving forward along the track of the already cast beam segment. It directly utilizes the completed piers and beams as support points, eliminating the need for large-area, full-span scaffolding under the bridge. This effectively solves construction obstacles when crossing deep valleys, deep-water channels, and busy transportation hubs, making it an indispensable key technical equipment in the construction of modern long-span bridges.

[0003] In existing conventional hanging basket construction methods, the initial assembly and positioning of the hanging basket is usually concentrated on block #0 at the top of the pier. Generally, the construction unit will rely on the spacious ground working space to pre-assemble the main truss, anchoring system, suspension system, and formwork components of the hanging basket on the ground or access road. Subsequently, heavy-duty cranes are used to directly hoist the components or the entire structure to the working surface at the top of the pier. This conventional method relies heavily on the large-scale spatial working capacity of the lifting equipment, using the free lifting and rotation of the boom to quickly complete the high-altitude assembly and positioning of the hanging basket.

[0004] However, the shortcomings of existing hanging basket construction methods become increasingly apparent when bridge pier construction is situated in complex environments with height restrictions such as high-voltage power lines overhead and extremely limited surrounding space due to proximity to highways and river embankments. In such a multi-dimensional environment with intersecting height restrictions, the lifting height of large cranes is strictly limited by the safety distance to overhead high-voltage lines, and their turning radius is also prone to encroaching on the lifting restrictions of existing surrounding facilities, rendering conventional direct lifting schemes completely ineffective. To complete installation within such limited clearance, construction teams are often forced to adopt a compromise: first erecting temporary auxiliary supports, then assembling the superstructure in small components on-site, and finally moving the main truss forward as a whole. This non-standard method not only involves cumbersome procedures, a large amount of high-altitude assembly work, and a sharp increase in safety risks, but also severely restricts construction efficiency and significantly increases the overall cost of the project. Summary of the Invention

[0005] In response to the above-mentioned defects or improvement needs of existing technologies, this invention provides a smart hanging basket construction method and system under highly restricted conditions. By adopting an integrated construction scheme of support erection, hanging basket installation, intelligent preloading, support dismantling, and cantilever pouring, it solves the problems of traditional hanging basket installation being impossible and having high safety risks in multi-dimensional restricted environments such as under high-voltage lines and adjacent to main traffic lines. It achieves the overall goal of safe, efficient, economical, and controllable hanging basket construction in complex environments.

[0006] According to a first aspect of the present invention, a smart hanging basket construction method under highly confined conditions specifically includes the following steps: S100. Construct the support foundation, columns, trusses, distribution beams and work platform in sequence according to the construction process. After construction, take edge protection measures, set up settlement observation points and determine the initial elevation at the same time, and track and monitor the settlement throughout the construction process. S200, hoisting the bottom basket components on the riverside, and sequentially completing the installation of the core structure of the track, main truss, anchoring device, and horizontal connecting rod; S300, symmetrically complete the installation of the side span hanging basket, then carry out the bottom basket assembly and bottom protection construction, install the overall formwork system and set up the operation platform, install the pre-compression reaction frame to complete the pre-compression test of the hanging basket, and remove the reaction frame after the pre-compression is qualified; S400, dismantle the supports in the order of bridge deck, distribution beam, truss, and column, cut off the embedded parts on site, remove the support foundation piles, strictly control the safety of hoisting operations during the dismantling process, clean up construction waste in time after dismantling, and backfill and compact the site. S500. Conduct a comprehensive and detailed inspection, and carry out the binding of steel bars for the cantilevered segments and the installation of prestressed ducts.

[0007] Furthermore, in step S300, the pre-compression of the hanging basket specifically includes: S301. Move the upper main truss structure of the hanging basket to the design position, symmetrically complete the installation of the side span hanging basket, and use symmetrical balance control to ensure uniform overall stress. Then, complete the construction of the bottom basket frame, bottom protection and operating platform in sequence, and then install the inner and outer sliding beams and formwork. S302. Embed pre-embedded parts on block 0#, assemble reaction frame and reliably connect it with beam body, arrange jacks, pad beams and hydraulic equipment, attach strain gauges, set up displacement gauges and visual targets, and complete hardware wiring and software debugging through line connection and signal verification control. S303. Perform graded loading, applying the design load sequentially to 30%, 50%, 100%, and 120%. The loading process is controlled synchronously at multiple points to ensure consistent output of each jack. After each load level is reached, the load is held for a predetermined time. The system monitors stress and displacement in real time, and automatically stops immediately if any abnormality occurs. S304. After the preloading is completed, unload in stages of 120%, 100%, 50%, and 0%. Deformation tracking control is performed throughout the process. Elastic and inelastic deformations are recorded, and the measured values ​​are compared with the allowable values ​​to determine whether the strength, stiffness, and stability of the hanging basket meet the construction requirements. S305. After the data is properly organized and a pre-stressing report is generated, the pre-stressing equipment is dismantled in sequence. Based on the deformation data obtained from the pre-stressing, the elevation of the hanging basket formwork is adjusted by pre-throwing height correction to achieve precise adjustment.

[0008] Furthermore, in step S301, it is also necessary to ensure that the template is smooth and the joints are tight, eliminating assembly deviations. At this time, the dual-control method of axis and elevation is used for control. The dual-control method of axis and elevation uses the longitudinal axis of the bridge design as the plane position control reference and the beam design elevation line as the vertical position control reference to dually control the plane axis deviation and vertical elevation deviation of the hanging basket template, while limiting the misalignment of template joints and surface smoothness deviations.

[0009] Furthermore, in step S302, the line connectivity and signal verification control is divided into two core stages: physical line connectivity verification and multi-type sensor signal verification and calibration. Through full-link, multi-dimensional detection and debugging, it is ensured that the hardware equipment wiring is fault-free, the signal transmission is lossless, and the software system and hardware equipment are coordinated and matched.

[0010] Furthermore, during the verification of physical line connectivity, the continuity, loop impedance, and polarity matching of each device are quantitatively determined. The necessary and sufficient condition for the wiring of a single device to be qualified is that all elements of its physical characteristic matrix are within the allowable threshold range. in, For physical characteristic matrix, , To allow threshold matrix, , In on / off state, Indicates pathway, Indicates a circuit break. , The loop impedance must meet the equipment design impedance range. ,Right now ; For polarity matching degree, Indicates polarity matching, Indicates reverse polarity, that is .

[0011] The overall line connectivity qualification criterion is: the physical characteristic matrix of all hardware devices in the system meets the compliance requirements, that is: .

[0012] Furthermore, after the physical circuit connectivity verification is qualified, multi-type sensor signal verification and calibration are performed. For different types of sensor signals such as strain, displacement, visual positioning, and hydraulic pressure, single-point signal validity verification, multi-point signal synchronization verification, signal range and accuracy calibration, and software and hardware signal interaction matching verification are performed.

[0013] Furthermore, when solving for the calibration coefficients, the first... Taking this type of device as an example, the measured signal vector With standard signal vector The fitting relationship is as follows: in, To fit the residual vector, Calibration coefficient The optimal solution is to minimize the Euclidean norm of the residuals, specifically: Then, the optimal calibration coefficient is obtained by matrix differentiation. : The criterion for signal validity is that the Euclidean norm of the calibrated residual vector must be less than the permissible threshold for signal validity. ,Right now: in Let be the dimension of the signal vector. The residual vector is the first Each element.

[0014] In multi-point signal synchronization verification, a signal time series cross-correlation algorithm is used to quantify the signal synchronization between multiple devices, and the first step is to calculate the... Class 1 , The cross-correlation function of the signals from each device is used to solve for the synchronization time difference. And determine whether it is within the allowed range.

[0015] Among them, two signals are , The device cross-correlation function is: Synchronization time difference When the cross-correlation function reaches its maximum value Value, that is: The absolute value of the synchronization time difference between all devices of the same type is less than the allowable limit, that is: .

[0016] Furthermore, when performing software and hardware signal interaction matching verification, the software and hardware interaction process is treated as a linear time-invariant system. The frequency domain characteristics of the transfer function are used to determine the software and hardware compatibility. for: in The Laplace transform of the instructions output by the software system. The Laplace transform of the response signal of the hardware device; Amplitude-frequency response of transfer function and phase frequency characteristics The design requirements must be met, namely: in Angular frequency, For the allowable range of amplitude-frequency characteristics, To allow the maximum phase shift for phase frequency characteristics, This refers to the system's operating frequency band.

[0017] Furthermore, after the verification and calibration of multiple types of sensor signals are completed, system integration and overall verification are also required. The total error of the entire system link is calculated using a high-order [process]. The norm is used for quantification, taking into account wiring errors. Signal acquisition error Transmission error Software and hardware interaction errors Due to the superposition effect, the total error is: in ; The total error across the entire link is less than the allowable limit and meets all the above sub-item control requirements, namely: in, For the permissible characteristic domain of the transfer function, when all conditions are met simultaneously, it is determined that the line connection and signal verification control are completed, and the hardware wiring and software debugging are qualified.

[0018] According to a second aspect of the present invention, a smart hanging basket construction system under highly confined conditions is provided, comprising: The detection module is used to complete the erection of the support foundation, columns, trusses, distribution beams and working platform in sequence according to the construction process. After the erection is completed, edge protection measures are taken, settlement observation points are set up at the same time and the initial elevation is determined, and the monitoring is carried out throughout the entire construction stage. Installation module: used for hoisting the bottom basket components on the riverside, and sequentially completing the installation of the core structure of the track, main truss, anchoring device, and horizontal connecting rod; Preloading module: Used to symmetrically complete the installation of the side span hanging basket, followed by the assembly of the bottom basket, bottom protection construction, overall installation of the formwork system and the erection of the operation platform, installation of the preloading reaction frame to complete the preloading test of the hanging basket, and removal of the reaction frame after the preloading is qualified; Dismantling module: Used to dismantle the support in the order of bridge deck, distribution beam, truss, and column, cut off the embedded parts on site, remove the foundation piles of the support, strictly control the safety of hoisting operations during the dismantling process, clean up construction waste in time after dismantling, and backfill and compact the site. Casting module: Used for comprehensive and detailed inspection, binding of reinforcing bars for cantilevered segments, and installation of prestressed ducts.

[0019] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The intelligent hanging basket construction method of the present invention, by adopting an integrated construction scheme of support erection, hanging basket installation, intelligent pre-stressing, support dismantling and cantilever pouring, solves the problem that traditional hanging basket installation cannot be implemented and has high safety risks in multi-dimensional restricted environments such as under high voltage lines and adjacent to traffic arteries, and achieves the overall goal of safe, efficient, economical and controllable hanging basket construction in complex environments.

[0020] 2. The intelligent hanging basket construction method of the present invention uses the dual control method of symmetrical balance control and axis elevation to assemble and position the hanging basket, which solves the problems of hanging basket installation deviation, uneven stress, misalignment of formwork and grout leakage, and achieves the effects of high installation accuracy, balanced structural stress, smooth line and tight joints, thus providing a guarantee for the quality of subsequent pouring.

[0021] 3. The intelligent hanging basket construction method of the present invention completes hardware wiring and software debugging through line connection and signal verification control, which solves problems such as sensor signal drift, transmission distortion, and asynchronous response of software and hardware, and achieves intelligent control effect of accurate pre-pressure data, stable and reliable system, and accurate execution of loading instructions.

[0022] 4. The intelligent hanging basket construction method of the present invention solves the risks of structural rebound impact, sudden stress change of components, and loose connection caused by sudden load changes by adopting uniform and slow unloading control during the unloading stage. It achieves a safe construction effect of stable release of structural deformation, continuous controllability of stress state, and no vibration and impact throughout the process. Attached Figure Description

[0023] Figure 1 This is a schematic flowchart of a smart hanging basket construction method under highly restricted conditions according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the specific process of step S300 in a smart hanging basket construction method under highly restricted conditions according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the monitoring point layout for a smart hanging basket construction method under highly restricted conditions according to an embodiment of the present invention; Figure 4 This is a schematic diagram of strain gauge arrangement for a smart hanging basket construction method under highly constrained conditions according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the arrangement of rope displacement sensors in a smart hanging basket construction method under height-restricted conditions according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the visual target arrangement for a smart hanging basket construction method under highly restricted conditions according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the experimental loading of a smart hanging basket construction method under highly restricted conditions according to an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1 like Figure 1 As shown, this embodiment of the invention provides a smart hanging basket construction method under highly confined conditions, specifically including the following steps: S100. Construct the support foundation, columns, trusses, distribution beams and work platform in sequence according to the construction process. After construction, take edge protection measures, set up settlement observation points and determine the initial elevation at the same time. Track and monitor throughout the construction process, set early warning thresholds, and immediately initiate graded emergency response if any abnormality occurs. S200. Conduct a comprehensive quality inspection of the hanging basket components and key parts such as welding and bolt connections. After passing the inspection, construction can begin. The bottom basket components on the riverside side are hoisted in advance. The core structure of the track, main truss, anchoring device and horizontal connecting rod are installed in sequence to ensure that the connection of each part is firm and the positioning is accurate. S300. Move the upper structure of the hanging basket to the design position, symmetrically complete the installation of the side span hanging basket, then carry out the bottom basket assembly and bottom protection construction, install the overall formwork system and set up the operation platform, install the pre-compression reaction frame to complete the pre-compression test of the hanging basket, remove the reaction frame after the pre-compression is qualified, and clean up the assembly site. After the S400 and hanging basket assembly and pre-stressing are completed, the supports are dismantled step by step in the order of bridge deck, distribution beam, truss, and column. The embedded parts on site are cut off, and the foundation piles of the supports are removed. During the dismantling process, the safety of hoisting operations is strictly controlled. After dismantling, construction waste is cleaned up in time, and the site is backfilled and compacted. S500: Conduct a comprehensive and detailed inspection of the main truss, slideway, formwork, and suspension system of the hanging basket, implement the requirements for pre-construction, daily and phased graded inspections, replace damaged components in a timely manner, and carry out the binding of steel bars for the cantilevered segments and the installation of prestressed pipes after confirming that the hanging basket meets the standards. Ensure construction safety and quality control throughout the entire process.

[0026] In step S100, during scaffold erection, based on the limited space and load requirements on site, the scaffold foundation construction is completed first. Specialized equipment is used to drive the foundation piles to the designed bearing layer, ensuring proper pile connection and fixation to guarantee the foundation's bearing capacity meets standards. Subsequently, the scaffold columns are installed sequentially. Measuring tools are used to calibrate the verticality and planar position of the columns, and horizontal connecting members are installed to form a stable frame, enhancing the lateral stiffness of the scaffold. Next, the assembled truss structure is hoisted, precisely positioned, and securely connected to the columns. Then, distribution beams are laid and fixed, ensuring the support points of the distribution beams correspond to the stress points of the truss. Finally, the work platform panel is laid, and protective railings are installed around the platform to form a closed construction operating space. Throughout the process, the connection accuracy and installation quality of each component are strictly controlled.

[0027] like Figure 3 As shown, during settlement monitoring, settlement observation points are set up at key nodes connecting the foundation piles and columns of the support structure, clearly marked and with unobstructed views. Initial observations are conducted within 24 hours of support installation, and multiple measurements are taken to obtain the effective values ​​as the baseline elevation. Throughout the entire construction phase, including installation, assembly, and movement of the hanging basket, settlement observations are carried out at key nodes, and the settlement is calculated by comparing the initial data. Settlement warning indicators are clearly defined. If the warning threshold is reached, construction is immediately suspended, structural problems with the support structure are investigated, and graded emergency response measures such as reinforcement and unloading are taken until the support settlement stabilizes, ensuring the safety of subsequent construction.

[0028] In step S200, for areas with restricted hoisting on site, the key crossbeam of the bottom basket on the riverside is hoisted to the reserved position on the top surface of block #0 in advance and temporarily fixed. Then, the basket track and support beam anchor rods are installed, and the track flatness and height difference are calibrated to ensure a firm track connection. Inverted wheel sets and front supports are installed on the track, and temporary rear supports are set up. The assembled single main truss piece is hoisted into place and fixed with temporary diagonal bracing to ensure the stability of multiple main truss pieces. The main truss anchoring device is installed, and the main truss is firmly anchored to the beam or support using precision-rolled threaded steel. Then, the horizontal connecting rods and the front upper crossbeam are installed in sequence, and the high-strength bolts at each part are tightened. Finally, the hoisting rods are installed, the temporary support pads are removed, and the core structure debugging is completed.

[0029] In step S300, during the overall assembly of the hanging basket, a hydraulic walking device is used to slowly move the upper main truss structure of the hanging basket to the designed position of block 0#, simultaneously and symmetrically completing the installation and positioning of the side span hanging baskets to ensure the overall force balance of the hanging basket. Next, the bottom basket system is assembled. The pre-hoisted bottom basket crossbeams are lowered to the designed height, and high-strength threaded steel is used to anchor the rear crossbeams. The bottom longitudinal beams are installed and firmly connected to the crossbeams to form the bottom basket frame. A bottom protective structure is erected at the bottom of the bottom basket, an operating platform is laid, and protective railings are installed, with a material hoisting channel reserved. Then, the formwork system is installed. First, the outer sliding beam is hoisted and dragged through the outer formwork frame, suspending the outer formwork on the outer sliding beam and sliding it to the designated pouring position. Next, the inner sliding beam is hoisted, and the installation is completed using a winch. The inner formwork is assembled piece by piece, and finally, the end formwork is installed. Sealing between the formwork sections is performed to prevent grout leakage during pouring, and operating platforms are erected for each part.

[0030] After the formwork system is installed, the preloading reaction frame is hoisted and securely connected to the embedded parts of the beam to establish a complete preloading system. Using standard load preloading methods, the actual stress conditions during the hanging basket construction process are simulated to comprehensively test the load-bearing capacity and deformation of the main truss, suspension, and bottom basket structures. Elastic and inelastic deformation data of the hanging basket are recorded to provide parameter basis for subsequent construction. During preloading, the deformation and settlement of the hanging basket are monitored in real time. If any abnormality occurs, preloading is immediately stopped and the problem is investigated. After successful preloading, the reaction frame is dismantled in reverse order. The elevation of the hanging basket formwork is adjusted according to the preloading data. After assembly, the site is tidied up, and preparations are made for subsequent construction.

[0031] In step S400, after the hanging basket assembly and pre-stressing are completed and accepted, the scaffold dismantling operation begins. First, the protective railings of the work platform are removed, then the platform panels are removed piece by piece, followed by the distribution beams. Specialized tools are used to loosen the fixing clamps, and the beams are lifted off one by one by hoisting equipment. Next, the truss structure is dismantled, using multiple pieces of equipment working together to lift and remove the truss in sections, followed by the removal of the load-bearing beams and embedded parts. Then, the scaffold columns and horizontal connecting members are dismantled section by section. Before dismantling, hoisting equipment is used to secure the components to prevent them from falling. Finally, specialized equipment is used to remove the scaffold foundation piles, which are then cut, tidied, and transported away from the site.

[0032] Throughout the dismantling process, ensure proper safety measures are in place for high-altitude operations, establish a site warning zone, and strictly control the radius and height of hoisting operations to avoid contact with surrounding facilities. After the scaffolding is dismantled, promptly clean up component waste and construction debris at the construction site, and classify and properly store recyclable components. Level the site after the foundation piles have been removed, and use specialized equipment to backfill and compact the site to ensure a flat surface and adequate load-bearing capacity. If necessary, harden the site to restore the construction environment.

[0033] In step S500, before the cantilever casting construction, it is necessary to check the main truss welds, connecting bolts, and anchoring devices to ensure that the main truss is free from deformation, the welds are free from cracks, and the anchoring is firm; check the flatness of the slide, the connection status, and the application of lubricant to ensure smooth movement of the formwork; inspect the formwork system, checking the flatness of the formwork, the sealing of the joints, and the reinforcement status to ensure there is no deformation or grout leakage; check the slings, precision-rolled threaded steel, and lifting point connections of the suspension system to ensure there is no damage or looseness; check the jacks, hydraulic cylinders, and roller supports of the traction system to ensure normal operation; and at the same time, conduct a comprehensive inspection of all operating platforms, guardrails, and other safety facilities to ensure they are firm and reliable.

[0034] After the hanging basket passes inspection and acceptance, the cantilever casting construction officially commences. First, the reinforcing bars for the cantilever segments are tied within the hanging basket formwork, strictly controlling the bar spacing and protective layer thickness according to design requirements, and ensuring quality control of bar connections. Next, prestressed ducts are installed, their positions precisely positioned, and they are secured and sealed to prevent displacement and grout leakage during concrete pouring. After the reinforcing bars and prestressed ducts pass inspection, concrete is poured, controlling the pouring speed and sequence to ensure compaction. Once the concrete reaches its design strength, prestressing tensioning and grouting are carried out, strictly controlling tensioning stress and grouting quality to ensure the prestressing system meets standards. After completing one segment, a hydraulic walking device slowly moves the hanging basket to the next segment's designed position, repeating the above process until all cantilever casting is completed. Throughout the process, the deformation of the hanging basket and the stress on the beam are monitored in real time to ensure construction quality and safety control.

[0035] like Figure 2 , 4As shown in Figure -7, step S300, during the pre-compression of the hanging basket, specifically includes: S301. Move the upper main truss structure of the hanging basket to the design position, symmetrically complete the installation of the side span hanging basket, and use symmetrical balance control to ensure uniform overall stress. Then, complete the construction of the bottom basket frame, bottom protection and operating platform in sequence, and then install the inner and outer sliding beams and formwork. S302. Embed pre-embedded parts on block 0#, assemble reaction frame and reliably connect it with beam body, arrange jacks, pad beams and hydraulic equipment, attach strain gauges, set up displacement gauges and visual targets, and complete hardware wiring and software debugging through line connection and signal verification control. S303. Perform graded loading, applying the design load sequentially to 30%, 50%, 100%, and 120%. The loading process is controlled synchronously at multiple points to ensure consistent output of each jack. After each load level is reached, the load is held for a predetermined time. The system monitors stress and displacement in real time, and automatically stops immediately if any abnormality occurs. S304. After the preloading is completed, unload in stages of 120%, 100%, 50%, and 0%. Deformation tracking control is performed throughout the process. Elastic and inelastic deformations are recorded, and the measured values ​​are compared with the allowable values ​​to determine whether the strength, stiffness, and stability of the hanging basket meet the construction requirements. S305. After the data is properly organized and a pre-stressing report is generated, the pre-stressing equipment is dismantled in sequence. Based on the deformation data obtained from the pre-stressing, the elevation of the hanging basket formwork is adjusted by pre-throwing height correction to achieve precise adjustment.

[0036] In step S301, the symmetric balance control includes walking synchronization symmetric control, load symmetric balance control, deformation and torsion symmetric control, and overturning moment symmetric balance control.

[0037] The aforementioned synchronous symmetrical control of the travel needs to ensure that the displacement deviation on both sides does not exceed the allowable value at any time during the entire travel process of the main truss of the hanging basket. Specifically: in, For any moment during the walking process, for The displacement of the left main truss along the bridge axis at any given moment. for The displacement of the right-side symmetrical main truss along the bridge axis at any given moment. Allowable deviation for lateral walking synchronization.

[0038] The load symmetry balance control is used to control the self-weight and construction load deviation of symmetrically positioned components, ensuring symmetrical and uniform load distribution on both sides. It is a graded control system to achieve synchronous installation of components on both sides, consistent load growth rates, and that the relative deviation of the total load does not exceed the allowable value. Specifically, it includes: Load deviation control for individual symmetrical components: , Overall load symmetry balance control: , And synchronous control of load rate during installation: , in, The left side Total load of each component unit The right side Total load of each component unit This represents the total load of the left-side hanging basket. This represents the total load of the right-side hanging basket. The allowable load deviation for a single component. This represents the allowable relative deviation of the total load.

[0039] The deformation and torsional symmetry control includes vertical displacement deviation control of symmetry points and structural torsional angle control. The vertical displacement deviation control of symmetry points is as follows: The structural torsion angle is controlled as follows: in, The left side Vertical displacement of each monitoring point The right side of the first Vertical displacement of each monitoring point This refers to the allowable deviation of vertical displacement. The lateral torsion angle of the hanging basket or block #0. The allowable torsion angle for the hanging basket or block #0. The horizontal spacing between the monitoring points is symmetrical.

[0040] The overturning moment symmetric balance control is used to control the overturning moment generated by asymmetrical loads, ensuring overturning safety throughout the entire installation process of the hanging basket. This includes unbalanced moment control and overturning safety factor control. The unbalanced moment control is as follows: The anti-overturning safety factor is controlled as follows: in, The moment generated by the load on the left side about the overturning axis. This represents the moment generated by the load on the right side about the overturning axis. To design the maximum allowable unbalanced torque, The overturning moment provided for the hanging basket anchoring system This is the overturning safety factor.

[0041] In step S301, it is also necessary to ensure the smoothness of the formwork and the tightness of the joints, eliminating assembly deviations. At this time, the dual-control method of axis and elevation is used for control. The dual-control method of axis and elevation uses the longitudinal axis of the bridge design as the plane position control reference and the beam design elevation line as the vertical position control reference. It performs dual control on the plane axis deviation and vertical elevation deviation of the hanging basket formwork, while limiting the misalignment of the formwork joints and the surface smoothness deviation, so as to completely eliminate the formwork assembly deviation and ensure the smoothness of the formwork and the tightness of the joints.

[0042] like Figure 4-6 As shown, in step S302, the line connectivity and signal verification control is divided into two core stages: physical line connectivity verification and multi-type sensor signal verification and calibration. Through full-link, multi-dimensional detection and debugging, it is ensured that the hardware equipment wiring is fault-free, the signal transmission is lossless, and the software system and hardware equipment are coordinated and matched, providing a reliable foundation for the accurate acquisition and loading control of subsequent pre-pressure monitoring data.

[0043] During the physical circuit connectivity verification, after completing the cable wiring for hardware such as strain gauges, displacement gauges, visual targets, cameras, jacks, and hydraulic pump stations, and connecting them to the hydraulic control cabinet and intelligent pre-pressure control cabinet, a full-link connectivity verification of the power supply lines and signal transmission lines is performed using a path-by-path continuity test and loop impedance test. The focus is on checking the tightness of cable connections, the correctness of positive and negative polarities, and the reliability of shielding grounding, eliminating problems such as loose connections, incorrect connections, open circuits, and short circuits. Simultaneously, the loop impedance of each line is tested to ensure that the impedance value is within the allowable range of the equipment design, avoiding signal attenuation or equipment damage due to abnormal line impedance, thus achieving full connectivity and fault-free operation of all hardware devices and the control system's physical circuits.

[0044] When verifying the connectivity of physical circuits, the continuity, loop impedance, and polarity matching of each device are quantitatively determined. The necessary and sufficient condition for the wiring of a single device to be qualified is that all elements of its physical characteristic matrix are within the allowable threshold range. in, For physical characteristic matrix, , To allow threshold matrix, , In on / off state, Indicates pathway, Indicates a circuit break. , The loop impedance must meet the equipment design impedance range. ,Right now ; For polarity matching degree, Indicates polarity matching, Indicates reverse polarity, that is .

[0045] The overall line connectivity qualification criterion is: the physical characteristic matrix of all hardware devices in the system meets the compliance requirements, that is: .

[0046] After the physical circuit connectivity verification is passed, multi-type sensor signal verification and calibration are performed. For different types of sensor signals such as strain, displacement, visual positioning, and hydraulic pressure, single-point signal validity verification, multi-point signal synchronization verification, signal range and accuracy calibration, and software and hardware signal interaction matching verification are performed.

[0047] During the single-point signal validity verification, an excitation signal is sent to each sensor to detect whether the sensor's feedback signal is normal and whether there are any abnormalities such as no signal, garbled characters, or jumps, ensuring that a single sensor can normally collect and transmit signals. During multi-point signal synchronization verification, synchronization excitation commands are sent to multiple sensors of the same type simultaneously to detect the time synchronization deviation of the feedback signals from each sensor, ensuring that the synchronously acquired signals have no significant time difference and meeting the real-time monitoring requirements of graded loading. During signal range and accuracy calibration, a standard calibration source is used to calibrate the range of each sensor, and the actual measured signal of the sensor is compared with the standard value to correct the signal acquisition error and ensure that the signal acquisition accuracy meets the design requirements. During the software and hardware signal interaction matching and verification, loading commands are simulated in the intelligent pre-compression software system to test the hydraulic control cabinet's response to the jack's actions and the software system's real-time reception and analysis capabilities of sensor signals. This ensures that the software's command output is consistent with the hardware's action execution and that the hardware's signal acquisition matches the software's data analysis, thereby achieving coordinated linkage between software and hardware.

[0048] When performing verification and calibration of multiple types of sensor signals, the sensor signals are first calibrated. The signal calibration coefficients are then calculated by minimizing the Euclidean norm error between the measured signal and the standard signal. This enables precise signal control; simultaneously, the signal validity is determined by the signal residual norm.

[0049] When solving for the calibration coefficients, take the first... Taking this type of device as an example, the measured signal vector With standard signal vector The fitting relationship is as follows: in, To fit the residual vector, Calibration coefficient The optimal solution is to minimize the Euclidean norm of the residuals, specifically: Then, the optimal calibration coefficient is obtained by matrix differentiation. : .

[0050] The criterion for signal validity is that the Euclidean norm of the calibrated residual vector must be less than the permissible threshold for signal validity. ,Right now: in Let be the dimension of the signal vector. The residual vector is the first Each element.

[0051] In multi-point signal synchronization verification, a signal time series cross-correlation algorithm is used to quantify the signal synchronization between multiple devices, and the first step is to calculate the... Class 1 , The cross-correlation function of the signals from each device is used to solve for the synchronization time difference. And determine whether it is within the allowed range.

[0052] Among them, two signals are , The device cross-correlation function is: Synchronization time difference When the cross-correlation function reaches its maximum value Value, that is: The absolute value of the synchronization time difference between all devices of the same type is less than the allowable limit, that is: .

[0053] When performing software and hardware signal interaction matching verification, the software and hardware interaction process is treated as a linear time-invariant system. The frequency domain characteristics of the transfer function are used to determine the software and hardware compatibility. for: in The Laplace transform of the instructions output by the software system. The Laplace transform of the response signal of the hardware device; Amplitude-frequency response of transfer function and phase frequency characteristics The design requirements must be met, namely: in Angular frequency, For the allowable range of amplitude-frequency characteristics, To allow the maximum phase shift for phase frequency characteristics, This refers to the system's operating frequency band.

[0054] After the multi-type sensor signal verification and calibration are completed, system integration and overall verification are also required. The total error of the entire system link is calculated using a high-order [process]. The norm is used for quantification, taking into account wiring errors. Signal acquisition error Transmission error Software and hardware interaction errors Due to the superposition effect, the total error is: in ; The total error across the entire link is less than the allowable limit and meets all the above sub-item control requirements, namely: in, For the permissible characteristic domain of the transfer function, when all conditions are met simultaneously, it is determined that the line connection and signal verification control are completed, and the hardware wiring and software debugging are qualified.

[0055] In S304, a uniform, gradual unloading method is used during the unloading process to prevent structural rebound impact. This uniform, gradual unloading employs a first-order linear feedback control algorithm to ensure that the load descent process is free of sudden changes and impacts. Specifically: in, The instantaneous unloading rate of the load. For a moment The preload, To achieve the target unloading rate, , To allow the maximum unloading rate, This is the proportional control coefficient. For rate control error, ; Meanwhile, to avoid impact caused by sudden changes in unloading acceleration, the second derivative constraint must be satisfied: Ensure the unloading rate smoothly transitions from the initial value to the target rate. Then maintain a constant speed, with no acceleration or sudden stops throughout the entire process.

[0056] During the initial unloading phase, a smooth rate transition control is employed to avoid abrupt changes in the initial rate. Specifically: in, The transition time constant, To achieve the target rate Time; It is also necessary to consider the dynamic characteristics of the hanging basket structure to prevent structural rebound impact, resulting in: in, The rate of structural springback deformation. , For a moment Springback deformation of the hanging basket structure For the dynamic stiffness of the hanging basket structure, To prevent structural springback impact, the following conditions must be met simultaneously: Allowable error for rate control.

[0057] Example 2 This invention provides a smart hanging basket construction system under highly confined conditions, comprising: The detection module is used to complete the erection of the support foundation, columns, trusses, distribution beams and working platform in sequence according to the construction process. After the erection is completed, edge protection measures are taken, settlement observation points are set up at the same time and the initial elevation is determined, and the monitoring is carried out throughout the entire construction stage. Installation module: used for hoisting the bottom basket components on the riverside, and sequentially completing the installation of the core structure of the track, main truss, anchoring device, and horizontal connecting rod; Preloading module: Used to symmetrically complete the installation of the side span hanging basket, followed by the assembly of the bottom basket, bottom protection construction, overall installation of the formwork system and the erection of the operation platform, installation of the preloading reaction frame to complete the preloading test of the hanging basket, and removal of the reaction frame after the preloading is qualified; Dismantling module: Used to dismantle the support in the order of bridge deck, distribution beam, truss, and column, cut off the embedded parts on site, remove the foundation piles of the support, strictly control the safety of hoisting operations during the dismantling process, clean up construction waste in time after dismantling, and backfill and compact the site. Casting module: Used for comprehensive and detailed inspection, binding of reinforcing bars for cantilevered segments, and installation of prestressed ducts.

[0058] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A smart hanging basket construction method under highly confined conditions, characterized in that, Specifically, the following steps are included: S100. Construct the support foundation, columns, trusses, distribution beams and work platform in sequence according to the construction process. After construction, take edge protection measures, set up settlement observation points and determine the initial elevation at the same time, and track and monitor the settlement throughout the construction process. S200, hoisting the bottom basket components on the riverside, and sequentially completing the installation of the core structure of the track, main truss, anchoring device, and horizontal connecting rod; S300, symmetrically complete the installation of the side span hanging basket, then carry out the bottom basket assembly and bottom protection construction, install the overall formwork system and set up the operation platform, install the pre-compression reaction frame to complete the pre-compression test of the hanging basket, and remove the reaction frame after the pre-compression is qualified; S400, dismantle the supports step by step in the order of bridge deck, distribution beam, truss, and column, cut off the on-site embedded parts, and remove the support foundation piles; S500. Conduct a comprehensive and detailed inspection, and carry out the binding of steel bars for the cantilevered segments and the installation of prestressed ducts.

2. The intelligent hanging basket construction method under height-restricted conditions according to claim 1, characterized in that, In step S300, the pre-compression of the hanging basket specifically includes: S301. Move the upper main truss structure of the hanging basket to the design position, symmetrically complete the installation of the side span hanging basket, and use symmetrical balance control to ensure uniform overall stress. Then, complete the construction of the bottom basket frame, bottom protection and operating platform in sequence, and then install the inner and outer sliding beams and formwork. S302. Embed pre-embedded parts on block 0#, assemble reaction frame and reliably connect it with beam body, arrange jacks, pad beams and hydraulic equipment, attach strain gauges, set up displacement gauges and visual targets, and complete hardware wiring and software debugging through line connection and signal verification control. S303. Perform graded loading, applying the design load sequentially to 30%, 50%, 100%, and 120%. The loading process is controlled synchronously at multiple points to ensure consistent output of each jack. After each load level is reached, the load is held for a predetermined time. The system monitors stress and displacement in real time, and automatically stops immediately if any abnormality occurs. S304. After the preloading is completed, unload in stages of 120%, 100%, 50%, and 0%. Deformation tracking control is performed throughout the process. Elastic and inelastic deformations are recorded, and the measured values ​​are compared with the allowable values ​​to determine whether the strength, stiffness, and stability of the hanging basket meet the construction requirements. S305. After the data is properly organized and a pre-stressing report is generated, the pre-stressing equipment is dismantled in sequence. Based on the deformation data obtained from the pre-stressing, the elevation of the hanging basket formwork is adjusted by pre-throwing height correction to achieve precise adjustment.

3. The intelligent hanging basket construction method under height-restricted conditions according to claim 2, characterized in that, In step S301, it is also necessary to ensure that the template is smooth and the joints are tight to eliminate assembly deviations. At this time, the dual control method of axis elevation is used for control. The dual-control method of axis elevation uses the longitudinal axis of the bridge design as the plane position control benchmark and the beam design elevation line as the vertical position control benchmark to control the plane axis deviation and vertical elevation deviation of the hanging basket formwork, while limiting the misalignment of the formwork joints and the surface smoothness deviation.

4. A method for constructing a smart hanging basket under height-restricted conditions according to any one of claims 1-3, characterized in that, In step S302, the line connectivity and signal verification control is divided into two core stages: physical line connectivity verification and multi-type sensor signal verification and calibration. Through full-link, multi-dimensional detection and debugging, it is ensured that the hardware equipment wiring is fault-free, the signal transmission is lossless, and the software system and hardware equipment are coordinated and matched.

5. The intelligent hanging basket construction method under height-restricted conditions according to claim 4, characterized in that, When verifying the connectivity of physical circuits, the continuity, loop impedance, and polarity matching of each device are quantitatively determined. The necessary and sufficient condition for the wiring of a single device to be qualified is that all elements of its physical characteristic matrix are within the allowable threshold range. in, For physical characteristic matrix, , To allow threshold matrix, , In on / off state, Indicates pathway, Indicates a circuit break. , The loop impedance must meet the equipment design impedance range. ,Right now ; For polarity matching degree, Indicates polarity matching, Indicates reverse polarity, that is , The overall line connectivity qualification criterion is: the physical characteristic matrix of all hardware devices in the system meets the compliance requirements, that is: 。 6. The intelligent hanging basket construction method under height-restricted conditions according to claim 5, characterized in that, After the physical circuit connectivity verification is passed, multi-type sensor signal verification and calibration are performed. For different types of sensor signals such as strain, displacement, visual positioning, and hydraulic pressure, single-point signal validity verification, multi-point signal synchronization verification, signal range and accuracy calibration, and software and hardware signal interaction matching verification are performed.

7. The intelligent hanging basket construction method under height-restricted conditions according to claim 6, characterized in that, When solving for the calibration coefficients, take the first... Taking this type of device as an example, the measured signal vector With standard signal vector The fitting relationship is as follows: ， in, To fit the residual vector, Calibration coefficient The optimal solution is to minimize the Euclidean norm of the residuals, specifically: ， Then, the optimal calibration coefficient is obtained by matrix differentiation. : ， The criterion for signal validity is that the Euclidean norm of the calibrated residual vector must be less than the permissible threshold for signal validity. ,Right now: ， in Let be the dimension of the signal vector. The residual vector is the first One element, In multi-point signal synchronization verification, a signal time series cross-correlation algorithm is used to quantify the signal synchronization between multiple devices, and the first step is to calculate the... Class 1 , The cross-correlation function of the signals from each device is used to solve for the synchronization time difference. And determine whether it is within the allowable range. Two of the signals are , The device cross-correlation function is: ， Synchronization time difference When the cross-correlation function reaches its maximum value Value, that is: ， The absolute value of the synchronization time difference between all devices of the same type is less than the allowable limit, that is: 。 8. The intelligent hanging basket construction method under height-restricted conditions according to claim 7, characterized in that, When performing software and hardware signal interaction matching verification, the software and hardware interaction process is treated as a linear time-invariant system. The frequency domain characteristics of the transfer function are used to determine the software and hardware compatibility. for: ， in The Laplace transform of the instructions output by the software system. The Laplace transform of the response signal of the hardware device; Amplitude-frequency response of transfer function and phase frequency characteristics The design requirements must be met, namely: ， in Angular frequency, For the allowable range of amplitude-frequency characteristics, To allow the maximum phase shift for phase frequency characteristics, This refers to the system's operating frequency band.

9. The intelligent hanging basket construction method under height-restricted conditions according to claim 8, characterized in that, After the multi-type sensor signal verification and calibration are completed, system integration and overall verification are also required. The total error of the entire system link is calculated using a high-order [process]. The norm is used for quantification, taking into account wiring errors. Signal acquisition error Transmission error Hardware and software interaction errors Due to the superposition effect, the total error is: ， in ; The total error across the entire link is less than the allowable limit and meets all the above sub-item control requirements, that is: ， in, For the permissible characteristic domain of the transfer function, when all conditions are met simultaneously, it is determined that the line connection and signal verification control are completed, and the hardware wiring and software debugging are qualified.

10. A smart hanging basket construction system under highly confined conditions, used to implement the construction method as described in any one of claims 1-9, characterized in that, include: The detection module is used to complete the erection of the support foundation, columns, trusses, distribution beams and working platform in sequence according to the construction process. After the erection is completed, edge protection measures are taken, settlement observation points are set up at the same time and the initial elevation is determined, and the monitoring is carried out throughout the entire construction stage. Installation module: used for hoisting the bottom basket components on the riverside, and sequentially completing the installation of the core structure of the track, main truss, anchoring device, and horizontal connecting rod; Preloading module: Used to symmetrically complete the installation of the side span hanging basket, followed by the assembly of the bottom basket, bottom protection construction, overall installation of the formwork system and the erection of the operation platform, installation of the preloading reaction frame to complete the preloading test of the hanging basket, and removal of the reaction frame after the preloading is qualified; Dismantling module: Used to dismantle the support in the order of bridge deck, distribution beam, truss, and column, cut off the embedded parts on site, remove the foundation piles of the support, strictly control the safety of hoisting operations during the dismantling process, clean up construction waste in time after dismantling, and backfill and compact the site. Casting module: Used for comprehensive and detailed inspection, binding of reinforcing bars for cantilevered segments, and installation of prestressed ducts.

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