1238 results about "Long span" patented technology

The invention discloses a large-span truss hoisting and splitting system and method based on digital twinning, and belongs to the technical field of building construction, and the system comprises a physical entity unit, a data acquisition and transmission unit, a digital twinning model unit, a function service and data analysis unit and an application and interaction unit. According to the invention, through real-time sensing of a physical entity state, multi-source data fusion transmission, high-precision digital twinning modeling, intelligent simulation analysis and decision optimization, and fusion of multi-modal man-machine interaction, a virtual control system which is in whole-course synchronous mapping and bidirectional interaction with a physical entity is constructed; according to the method, real-time visual monitoring, trend prediction and risk early warning of the hoisting and splitting process can be achieved, scheme preview and dynamic optimization are supported, virtual-real fusion operation guidance is achieved through the AR technology, and the safety, precision and efficiency of hoisting and splitting operation of the large-span truss are improved.

The invention belongs to the field of bridge engineering construction monitoring and intelligent control, and provides a Beidou digital twinning system for bridge steel member precision hoisting and a hoisting method aiming at the problems of low efficiency and poor real-time performance of on-site hoisting of a segment steel member in a large-span bridge structure. The system comprises a multi-source data acquisition module, a coordinate conversion module, an attitude calculation module, a three-dimensional virtual model construction module, a hoisting motion state monitoring module and a digital twinning module. The attitude resolving module calculates a standard attitude vector by using a comprehensive deep learning model according to the degree-of-freedom data, the attitude information and the movement speed, and performs attitude resolving based on the standard attitude vector to obtain an attitude angle of the bridge steel member; the hoisting motion state monitoring module can perform safety early warning and posture adjustment when the bridge steel member is abnormal; and the digital twin module can synchronously update the attitude information and the three-dimensional virtual model of the bridge steel member to obtain the current space trajectory and historical state of the bridge steel member.

The invention discloses a high-pier large-span extra-large bridge suspended pouring beam hanging basket construction method, and belongs to the field of bridge engineering construction.The method comprises the following steps that hanging basket rails are installed, the precision is controlled, and a hanging basket comprising a double-channel-steel main truss, a manganese steel sling, an arc-shaped flow guide plate and a honeycomb formwork is assembled; grading pre-pressing is carried out according to the specified multiple of the design load, and the pre-camber of the template is corrected by adopting a BP neural network to ensure that the finished bridge linear error meets the requirement; a mechanical-hydraulic-electrical integrated intelligent control system is deployed, and the traveling speed and synchronism of the hanging basket are controlled through double-oil-cylinder driving, a 5G digital twin platform and an edge computing technology, so that rapid alarm is realized when the load is abnormal; segmental circulation construction is carried out, and when the environment wind speed reaches a set value, a hydraulic rail clamping device is automatically locked; a model is established by using ANSYS software, and simulation verification is performed on multiple types of key working conditions to ensure that the safety coefficient of the structure meets the specification requirement. The construction precision and safety are guaranteed, and the method adapts to complex environments.

The invention provides a bridge stay cable video multi-target identification tracking and vibration extraction method based on an unmanned aerial vehicle. The method comprises the following steps: 1, constructing a bridge stay cable refined inclined slender target detection model based on a YOLOv11 model; 2, providing a multi-target tracking algorithm fusing the inclined slender target detection model and a StrongSORT algorithm; step 3, improving a displacement extraction method combining SIFT / ORB feature point matching and a sub-pixel refinement technology; 4, designing an unmanned aerial vehicle motion correction algorithm based on variational mode decomposition and time-frequency domain combined screening; and 5, constructing a joint working modal analysis algorithm for realizing combination of a natural excitation technology and a random subspace recognition algorithm. According to the method, high-precision extraction of the vibration signals of the stay cable and identification of modal parameters of the stay cable are realized, and technical support is provided for health monitoring of the large-span cable-stayed bridge.

The invention discloses a concrete cantilever structure pull-up formwork construction method which is characterized by comprising the following steps: load calculation and component model selection; pre-burying the U-shaped bolts; pre-burying the upper-section pull rod; i-shaped steel end connecting plates are welded, and double-layer angle steel connecting plates are welded to the cantilever ends of the I-shaped steel; i-shaped steel cantilever girders are installed; assembling a pull rod system; the pull rods are fastened and leveled with a system, the two pull rods are synchronously fastened, the double rods are ensured to simultaneously advance and retreat during adjustment of an adjusting device, and a level gauge is used for observation and leveling after initial adjustment; the formwork frame and the safety enclosure are installed; pull rod pre-tensioning and deflection monitoring are carried out, pre-tension force is applied through an adjusting device, the deflection of the cantilever end is detected, monitoring points are arranged, and a deformation early warning mechanism is established; regulating and controlling concrete pouring; and removing the mold and recycling. The overhanging structure is high in anti-overturning capacity and suitable for large-span and special-shaped overhanging structures, and the safety is remarkably improved.

The invention discloses a large-span steel structure corridor overall lifting rapid installation system and technology. The installation system comprises an inclination angle monitoring module, a steel truss end displacement detection module, a data monitoring module, a detection early warning module and an early warning removing module. According to the inclination angle monitoring module, a high-precision inclination angle sensor is pasted to the middle position of a truss, the inclination angle theta of the steel truss is monitored in real time through the high-precision inclination angle sensor, the sensor is connected with a PC terminal, and inclination angle data are received in real time. Therefore, the construction progress is accelerated, and the construction cost is reduced; the synchronism of the large-span steel truss in the whole lifting process can be accurately monitored; the working procedures of pausing lifting and measuring every time lifting is conducted by a certain distance in the traditional construction process are omitted, continuous lifting is achieved, and the construction quality and efficiency are improved.

The invention relates to a method, a system and equipment for predicting creep stress at a joint of a concrete structure and a medium. The method comprises the following steps: testing a concrete structure material and a concrete structure joint filling material, and constructing a joint material performance database based on test data; constructing a multi-scale mechanical model comprising a macrostructure model and a microcosmic interface model based on the seam material performance database; constructing an interface constitutive relationship based on the seam material performance database and the multi-scale mechanical model; and predicting the creep stress at the joint of the concrete structure based on the material performance database at the joint, the multi-scale mechanical model and the interface constitutive relationship. The method can fully consider the sudden change of the performance of the material at the joint and the interface effect, provides reliable technical support for the safety evaluation and maintenance of the concrete structure, and is particularly suitable for engineering application of large-span and high-rise buildings and the like with higher requirements on the long-term performance of the structure.

The invention relates to a multi-dimensional space long-span bridge track vertical deviation temperature-sensitive component extraction method. The method comprises the steps of integrating long-span bridge track vertical deviation three-dimensional historical data added with an environment temperature label; adopting empirical wavelet transform to construct an MRA component four-dimensional data set containing a temperature label and a wavelength label; after mileage dimension resampling, projecting data to an amplitude-wavelength space, drawing an accumulated amplitude growth curve, judging the type of the amplitude-wavelength curve, and determining a boundary wavelength of bridge deformation and track irregularity; projecting the data to an amplitude-temperature space, and judging an amplitude curve and temperature sensitivity; and in combination with the boundary wavelength and the temperature sensitivity, extracting a temperature sensitive component of track irregularity and a construction deviation component in actual bridge deformation. According to the method, synchronous identification and extraction of the temperature sensitive component in the track vertical deviation and the bridge construction deviation component can be realized, and a quantitative basis is provided for accurate maintenance and repair of a long-span railway bridge.

The invention provides a construction method for installing a large-span special-shaped beam curved template system, and belongs to the technical field of building construction. According to the construction method, accurate three-dimensional modeling is conducted on the shape of a special-shaped beam through a special-shaped curved surface parametric modeling algorithm, and material prefabrication is guided; eight oscillation excitation devices and twelve vibration monitoring devices are optimally arranged by using experimental design and a graph theory analysis method to form a dynamic monitoring network, vibration response data are analyzed in real time by using a wavelet transform monitoring algorithm, and the energy ratio of each frequency band is calculated as a quality evaluation index. A game optimization model is established, and according to different ranges of energy ratios, the support spacing is automatically adjusted, a back ridge fixing mode is combined or a supporting system is reinstalled, so that a comprehensive quality assurance system of accurate geometric modeling-dynamic state monitoring-intelligent parameter adjustment is constructed. The technical problem that the installation quality of a large-span special-shaped beam curved template system is difficult to guarantee is solved.

The invention provides a large-span beam formwork three-dimensional parameterization deepening design method, and belongs to the technical field of building construction.The method includes the steps that geometric parameters of a large-span beam three-dimensional parameterization model are obtained, and a multi-scale homogenization mechanical analysis model is established to describe nonlinear characteristics of a concrete material; an arc length control method is combined with a Newton-Raphson iterative improved algorithm to carry out large-deformation nonlinear analysis to calculate deformation control parameters, safety performance is evaluated, support structure parameters are adjusted, and a double-layer game optimization model is established to determine optimal template support system parameters. On the basis of a bending-torsion coupling analysis result, a force transmission path diagram is established through a load transmission path generation function, and an optimal force transmission path is determined by adopting a gradient optimization algorithm, so that the problems that the design of a large-span beam formwork supporting system lacks an accurate mechanical calculation basis, and structural deformation and stress distribution cannot be accurately predicted are solved; and the design of the supporting system is not reasonable.

The invention relates to the technical field of bridge monitoring, and discloses a bridge structure health monitoring sensing device, comprising: a distributed optical fiber sensing module, in which a sensing optical fiber is configured to be continuously laid along the surface or the interior of a to-be-monitored area of a bridge structural member to form a measurement section covering the monitoring area; the point type sensing module is mounted at the key section position of the structure; the multi-parameter fusion processing unit is in signal connection with the distributed optical fiber sensing module and the point type sensing module; packaging the assembly; the self-energy-supply management module is used for collecting vibration energy and photovoltaic energy in a bridge environment; and a wireless communication module. Through cooperative work of the distributed optical fiber sensing module and the point type sensing module, continuous spatial resolution monitoring of a bridge structure is achieved through distributed optical fibers, a complex structure of a large-span bridge is covered, damage such as fatigue cracks at a local rigidity sudden change position is accurately captured, and the insufficient coverage and omission risk of traditional point type monitoring are avoided.

The invention relates to the technical field of steel structure construction, aims to solve the problem of low precision caused by an existing integral hoisting mode, and provides an integral hoisting system and method for a large-span steel truss girder. Comprising a control module, a hydraulic lifting module, a three-dimensional laser scanner, a total station and an identification acquisition identifier arranged on a steel truss girder to be lifted, and the hydraulic lifting module, the three-dimensional laser scanner and the total station are connected with the control module; a hydraulic synchronous lifting technology is fused with a space positioning technology and a three-dimensional laser scanning technology of the total station, and a hydraulic lifting module is automatically adjusted by adopting data feedback of the three-dimensional laser scanner and the total station, so that the synchronization rate and the accuracy during overall lifting are improved, and the system is suitable for overall lifting of the large-span steel truss girder.

The invention discloses a digital twinning long-span bridge earthquake wind vibration and vibration reduction and isolation system and method, the system takes a high-fidelity digital model for constructing a long-span bridge as a basis, comprises full life cycle monitoring and management of the bridge under earthquake, wind vibration and vibration reduction and isolation conditions, and is based on a sky-air-ground-water integrated ubiquitous sensing module. In combination with artificial intelligence algorithms such as deep learning and a pulse neural network, real-time state evaluation of a bridge structure, material nonlinear analysis, geometric nonlinear analysis, multi-point excitation and pile-soil-structure interaction simulation, wind-induced fatigue damage prediction, earthquake vulnerability evaluation and closed-loop control scientific decision based on an artificial intelligence body are realized. According to the invention, system support and method guidance can be provided for large-span bridge anti-seismic and anti-wind design, intelligent monitoring, operation and maintenance management and vibration reduction and isolation system optimization.

The invention discloses a method for setting and controlling a buckle cable adjustment threshold value in large-span arch bridge hoisting construction, which comprises the following steps of: acquiring construction parameters of a current buckle section, and acquiring a corresponding cable adjustment target value; constructing a structural mechanics finite element model of the target buckle cable based on the construction parameters, and introducing a buckle cable multi-harness nonlinear stress mechanism into the model to calculate upper and lower limit thresholds of cable force in the tensioning process; determining an elevation adjustment threshold according to the target axis, the target elevation, the accumulated deviation and the pre-deformation compensation amount in combination with a geometric linear control model; and generating an environmental influence correction coefficient by utilizing construction environmental parameters, and dynamically correcting the cable force and the elevation threshold value to realize real-time updating of the threshold value in the hoisting process. According to the method, the problems of nonlinearity of multiple wire harnesses of the large-span arch bridge buckle cable, high linear sensitivity of the arch rib, remarkable environmental influence and the like are solved, high-precision cooperation of cable force control and linear control is realized, and the safety, controllability and construction efficiency of hoisting construction are improved.

The invention relates to the technical field of steel structure supporting, and discloses a self-leveling universal support for large-span steel structure temporary supporting and a construction method thereof.The self-leveling universal support comprises a mounting base, a shockproof and antiskid mechanism, a reinforcing lifting mechanism, a fixing mechanism and a stable placement mechanism, and a self-leveling supporting mechanism is arranged on the mounting base. According to the self-leveling universal support for temporary supporting of the large-span steel structure and the construction method of the self-leveling universal support, through the arrangement of the self-leveling supporting mechanism, a first electric push rod can be controlled to stretch out and draw back in a first mounting groove according to the actual state of the steel structure, meanwhile, a supporting plate can freely rotate and slightly move in the horizontal direction through a spherical hinge connecting structure of a ball head and a ball socket, and the self-leveling supporting mechanism is arranged; the jackscrew can be screwed into the connecting block to abut against the surface of the ball head during installation and debugging, the ball head is fixed and limited to a certain degree, the supporting requirements under different working conditions are met, in this way, the situation that additional stress is generated due to the fact that the interior of the structure cannot adapt to deformation is avoided, and installation precision and safety are improved.

The invention relates to a large-span beam arching structure device and an arching method, and the device comprises a supporting device which is arranged at the middle position of a bottom span of a beam body; the jacking arching device is used for applying jacking force to the beam body by taking the midspan center line of the beam body as a symmetry axis and is mounted on the supporting device; and the cable-stayed pull-down device is used for synchronously applying downward and inward component forces to the two sides of the beam body while applying the jacking force along with the jacking arching device so as to form the required arching radian. According to the device, the pull-down device is directly connected with the jacking device, pull-down is automatically achieved in the jacking process, the force flow path is clear, the risk that independent operation is asynchronous is effectively solved, and arching arcs are controlled more accurately and efficiently; downward and inward constraining force is provided in a cable-stayed mode, lateral instability or distortion possibly occurring in the jacking process of a beam body can be effectively restrained, and the safety of the construction process is improved.

The invention provides a vertical position welding method for bridge steel. The vertical position welding method comprises the steps that 1, a groove is manufactured, specifically, the X-shaped groove without a truncated edge is manufactured in a vertical position mode through a flame cutting technology; and the groove is polished and derusted according to requirements. 2, preheating, wherein the bridge steel is preheated to 75 DEG C in an electric heating mode; and 3, welding, wherein solid welding wire argon-rich mixed gas shielded welding is adopted for vertical position welding. And 4, post-weld heat treatment is conducted, specifically, after welding is completed, post-heat treatment is conducted at 200-250 DEG C through a crawler-type heater, and slow cooling is conducted to the room temperature after heat preservation is conducted for 3 hours. By researching and developing a welding material and a welding process matched with the Q890qE high-strength bridge steel, the technical problem of quality of a Q890qE vertical position butt welding seam is solved. Welding forming is stable, efficiency is high, deformation is small, the appearance is good, strength and weather resistance are balanced, the service life is long, and economical efficiency and environment friendliness are both considered; the method is especially suitable for engineering scenes with strict requirements on strength, toughness and durability such as long-span bridges and alpine region bridges, and has remarkable economic advantages and social value.

The invention provides a large-span suspension bridge buffeting analysis method and system based on digital twinning, and relates to the technical field of road and bridge safety, and the method comprises the steps: obtaining a bridge finite element model of a target large-span suspension bridge in a design stage, the fluctuating wind speed time history data, the acceleration data, the actually measured displacement response data and the actually measured acceleration response data are acquired on site; performing parameter optimization on the bridge finite element model according to the acceleration data to obtain structural parameters; performing parameter extraction according to the fluctuating wind speed time history data to obtain wind parameters; performing finite element analysis according to the actually measured displacement response data, the actually measured acceleration response data and the wind parameters to obtain aerodynamic parameters; power load parameters acting on the bridge are obtained through calculation according to the wind parameters and the aerodynamic parameters; and constructing the digital twin according to the dynamic load parameters and the structural parameters. According to the method, high-precision simulation and prediction of the buffeting response of the large-span suspension bridge in a real service environment are realized.

The invention belongs to the technical field of bolt life monitoring, and discloses a device and a method for monitoring a high-strength bolt in a space grid structure based on acoustic emission, and the device is characterized in that an acoustic emission probe is arranged on the surface of a nut of the high-strength bolt; the acoustic emission probe is connected with the charge adapter; the charge adapter is connected with the high-frequency signal acquisition instrument; the high-frequency signal acquisition instrument is connected with the computer; the high-strength bolts generate fatigue cracks under the action of circulating and reciprocating loads; the acoustic emission probe transmits the acoustic emission process before fatigue fracture of the high-strength bolt to the computer, the computer draws a fatigue curve of the high-strength bolt, and online prediction is conducted on the whole life of the bolt, accurate early warning can be conducted before fracture, structural safety accidents are avoided, and the method is suitable for bridges, large-span buildings and other scenes with the high requirement for bolt strength; and long-term safety of infrastructures is guaranteed.

The invention discloses a building construction quality optimization method and system based on a large-span transfer beam, and relates to the technical field of building structure intelligent construction quality control, and the method comprises the steps: collecting multi-source engineering data, constructing a unified data standard, and carrying out the multi-working-condition disturbance modeling through combining a simulation platform; importing a finite element system for dynamic structure response analysis and outputting a response risk map; mapping the response variable to a multi-factor coupled bearing capacity function, and outputting a load limit which can be actually and stably borne by the template system; and constructing an on-site real-time monitoring network, performing linkage comparison on monitoring data and a multi-working-condition disturbance modeling result, and driving response verification, maintenance strategy adjustment and demolding node management and control. According to the method, a construction quality optimization mechanism with disturbance modeling, bearing capacity evaluation and real-time monitoring as the core is constructed, and risk prediction, response regulation and control and quality closed-loop control of the whole construction process of the large-span transfer beam are achieved.

The invention discloses a construction method and system of a three-layer inclined quadrangular pyramid grid structure, and relates to the technical field of building steel structure construction. The method comprises the steps of building an intelligent monitoring control system, carrying out BIM collaborative assembly and calibration, carrying out multi-dimensional graded lifting, carrying out adaptive attitude correction, carrying out BIM collaborative in-place recording and the like. The corresponding system comprises an intelligent monitoring control module, a BIM collaborative management module, a hydraulic synchronous lifting execution module, a posture correction module and an unloading in-place module. Through deep integration of a distributed control network and a BIM technology, dynamic monitoring, self-adaptive adjustment and visual management of the construction process can be realized, the accuracy, safety and efficiency of construction of the three-layer inclined quadrangular pyramid grid structure are improved, and the method is suitable for large-span steel structure grid installation engineering.

The invention belongs to the technical field of process control, and discloses a high-speed rail large-span continuous beam linear whole-process control method. Comprising the following steps: collecting continuous beam structure parameter data in real time and cleaning the data to obtain continuous beam construction data; elevation fluctuation interference identification is carried out, and an elevation difference mutation area is output; performing leveling control based on the height difference abrupt change area to obtain leveling correction data; performing stress interference correction to obtain disturbance correction linear data; tensioning plan information is obtained in real time, tensioning offset correction is conducted on the tensioning plan information, and tensioning correction parameter data are generated; construction climate data are collected, tensioning control calibration is carried out on the tensioning correction parameter data, and calibration control stress data are output; zero offset compensation is executed, and monitoring data in the offset restoration process are output; constructing a control strategy based on the monitoring data of the offset repairing process, and sending the control strategy to a preset construction control terminal; and the stability and the data accuracy of linear control are improved.

The invention discloses a sliding trolley for large-span structure construction and a method thereof, and belongs to the technical field of building engineering construction. The sliding trolley comprises a combined platform and further comprises an assembling support and a walking mechanism; the number of the combined platforms is four, and the four combined platforms are located on the four splicing positions correspondingly. The combined platform comprises a spliced upper chord, a spliced lower chord, a reinforced beam frame and a plurality of groups of connecting and supporting structures; a plurality of groups of walking mechanisms are mounted on the lower side of the reinforcing beam frame; the walking mechanism comprises a guide supporting structure, a walking structure and a rising and falling supporting structure, the walking structure is fixedly installed on the lower side of the reinforcing beam frame, the guide supporting structure is fixedly installed on the base table through bolts, and the walking structure is installed and connected with the guide supporting structure; a plurality of sets of rising and falling supporting structures are evenly installed in the middle of the reinforcing beam frame and on the base table at equal intervals. By means of the mode, the assembling support and the bracket move back and forth below a large-span structure through the four sets of walking mechanisms and the connecting structure on the upper side, and the construction efficiency is improved.

The invention discloses a construction method for integrally lifting and then separately unloading and lifting a large-span split type steel corridor, which comprises the following steps of: overlapping and combining the lower layer and the upper layer of the split type steel corridor through temporary connecting pieces to form an integral lifting unit, and completing ground integrated installation of a preset accessory structure; a lifting device is arranged at the upper part of the design mounting position and is connected with the integral lifting unit; the whole lifting unit is synchronously lifted to the butt joint position of the lower-layer corridor, and butt joint fixing of the lower-layer corridor and the tower structure is completed; the temporary connecting pieces are dismantled for split unloading, so that the load of the lower-layer corridor is transferred to the tower structure; the upper-layer corridor is independently and synchronously lifted to the designed butt joint position of the upper-layer corridor, and butt joint and fixing of the upper-layer corridor and the tower structure are completed; and the lifting device and other temporary measures are dismantled, and construction of the steel corridor is completed. The construction technology of'split stacking and integral lifting + split unloading and re-lifting 'is adopted, and comprehensive optimization of construction of the large-span split steel corridor in multiple aspects of safety, quality and the like is achieved.

The invention belongs to the technical field of automatic control, and particularly relates to a large-span ellipsoidal glass structure space noise reduction method based on sound field optimization, and the method comprises the steps: 1, transmitting a sample noise in an ellipsoidal glass structure through a sound wave generator, building a sound wave propagation model to describe the behavior of the sample noise in the ellipsoidal structure, an incident sound field is obtained; 2, analyzing the propagation characteristics of the sample noise in the ellipsoidal glass structure to obtain an acoustic structure coupling equation, and solving the acoustic structure coupling equation to obtain structural vibration displacement; 3, obtaining a sound radiation field of the ellipsoidal glass structure according to the structural vibration displacement; and step 4, combining the incident sound field and the sound radiation field, and performing spatial noise reduction by reflecting the sound pressure of the sound field. According to the method, the problems of poor adaptability and low control precision of a traditional noise reduction method in a non-uniform structure are effectively solved, and the noise reduction efficiency, the control sensitivity and the environment adaptability of a building space are remarkably improved.

The invention relates to the technical field of large-span steel box girder bridge construction, and discloses a lifting oil jack steel strand and steel box girder lifting lug connecting lifting appliance which comprises a lifting beam, a windproof fixing assembly is arranged at the bottom of the lifting beam, and a stress balance optimizing assembly and a buffering assembly are arranged at the bottom of the lifting beam. The stress balance optimization assembly is used for effectively controlling tension balance of each steel strand in the steel box girder hoisting process of a crane, the buffering assembly is used for effectively buffering impact caused by sudden movement when the crane hoists the steel box girder, and the windproof fixing assembly comprises a motor and a support. And the output end of the motor is fixedly connected with a first rotating shaft. By means of the structure, the problems that a combined body of the lifting appliance and the steel box girder shakes due to wind in the air, the gravity center shifts during lifting, the tension of a steel strand is uneven, and parts are damaged due to sudden movement impact can be effectively solved, the stable lifting posture and operation safety can be guaranteed, and local overload damage can be avoided.

The invention relates to the technical field of building construction, and discloses a BIM (Building Information Modeling) deepening-based steel reinforced concrete composite column ultra-large-span corridor construction method, which comprises the following steps of: constructing a multi-modal sensing building information model, and integrating a fiber bragg grating and a distributed acoustic sensor on a steel member to form an intelligent member; establishing a data link between the intelligent component and the sensing BIM center and calibrating the data link; dynamic optimization control based on strain feedback is carried out on collaborative hoisting, and internal quality monitoring based on multi-modal sensing fusion is carried out on concrete pouring; after construction is completed, digital twin baseline calibration is carried out, and a data packet containing a structure initial state vector is generated. According to the method, the multi-modal sensing system and the BIM are deeply fused, and the whole construction process is penetrated, so that real-time, closed-loop and quantitative control of key procedures is realized, the safety, accuracy and quality of super-large complex structure construction are remarkably improved, and a high-fidelity digital twinning baseline is established for structural health monitoring of the whole life cycle of a building.

The invention provides a magnetic levitation type mechanical damping device for ultra-low-frequency vertical vortex-induced vibration of a super-large-span bridge girder, and belongs to the field of low-frequency structure vertical vibration control. The device comprises a mounting base, a top connecting plate, a spring device, a mass block, a magnetic force compensation unit, a damping device and a plurality of guide devices, the multiple guide devices are installed between the installation base and the top connecting plate, the mass blocks are installed on the peripheries of the multiple guide devices, the magnetic force compensation units are installed on the peripheries of the mass blocks, and the mass blocks can vertically move along the guide devices under the action of the magnetic force compensation units. Wherein the spring device and the damping device are vertically arranged between the top connecting plate and the mass block in parallel. The core innovation of the invention lies in providing a magnetic active compensation mechanism, and through a gradient magnetic field with a special configuration, approximately constant upward buoyancy is generated in a TMD vertical motion stroke, so that the mass block is always in a quasi-suspension state, and complete gravity unloading and dynamic tuning separation are realized.

The invention discloses a large-span suspension bridge support appearance defect image detection method and system, and the method comprises the steps: building a defect image segmentation network: introducing a module for multi-scale feature extraction and structure re-parameterization and a module for multi-scale cavity convolution and adaptive feature fusion into a backbone network, a loss function combined with appearance defect characteristics of the large-span suspension bridge support is added; multi-stage feature extraction is carried out on an input image through the two modules, and fusion and dimension reduction processing is carried out on the extracted features. Inputting a processing result into a head network, and performing up-sampling, feature splicing, multi-scale feature extraction and structure re-parameterization processing for multiple times; constructing a sample data set and completing model training; and obtaining defect information of the to-be-detected defect image based on the trained model. And the accuracy and the reliability of support appearance defect detection are effectively improved.

The invention provides a super-large-span net rack deformation monitoring method, and belongs to the technical field of deformation monitoring. A shape sensor is installed on a key rod piece of a super-large-span net rack in a wind tunnel test section, a double-grating differential compensation system suitable for a wind tunnel environment is established, and wavelength drift caused by high-speed airflow, temperature shock and pressure fluctuation is eliminated; a wavelength division multiplexing technology is adopted to carry out anti-interference signal acquisition, a double-layer game optimization model considering wind tunnel working condition characteristics is constructed to carry out dynamic error compensation, and a grating strain response matrix is established to realize accurate conversion from strain to deformation in a wind tunnel environment. A time sequence model based on a wind tunnel operation cycle is adopted to predict the wavelength drift trend of the sensor and start an adaptive compensation mechanism, and the technical problem that the deformation monitoring precision is seriously reduced due to wavelength drift of a wind tunnel test section ultra-large span grid structure under the action of high-speed airflow is solved.