1859 results about "Long span" patented technology

The invention discloses a large-span bridge vibration response prediction method based on data driving, and relates to the technical field of bridge vibration response prediction, and the method comprises the following steps: arranging a plurality of sensors at a plurality of key structure parts of a bridge, collecting vibration response data of the bridge during operation in real time based on an initial sampling frequency set based on the inherent frequency of the bridge structure; performing frequency domain analysis on the collected vibration response data, extracting a main excitation frequency component under the current working condition, and constructing a current excitation frequency spectrum; the method comprises the following steps: calling structural modal parameters obtained in a design stage, a static load test or a modal test of a bridge, extracting the natural vibration frequency of each order of structure, and constructing a bridge inherent frequency feature library; according to the method, the resonance state is dynamically identified through frequency domain analysis and the fuzzy risk index, the sampling frequency is intelligently adjusted, high-frequency response accurate capture and resource efficiency optimization are realized, and the sensitivity, the real-time performance and the safety of a bridge health monitoring system are remarkably improved.

The invention discloses a radar detection blind area wind field fine reconstruction method based on anemograph collaborative networking, and the method comprises the specific steps: firstly, separating wind speed measurement deviation caused by vibration displacement in real time, eliminating vibration interference, carrying out the automatic diagnosis and restoration of data based on machine learning, and optimizing the integrity of wind speed data and the measurement continuity; secondly, an ultrasonic anemograph array optimization arrangement method oriented to global wind field sensing is established, time-space consistency calibration of multi-sensor data is achieved, and the precision and reliability of wind speed measurement are improved; and finally, carrying out data-physical fusion bridge flow field high-resolution intelligent reconstruction, and improving the data integrity of a complex flow field area. The reconstruction method effectively cooperates with the wind measurement laser radar and the anemograph, the advantages of high-frequency single-point measurement and wide-area space scanning of the wind measurement laser radar and the anemograph can be exerted, high-precision reconstruction of the global flow field of the bridge is expected to be achieved, and reliable support is provided for guaranteeing wind resistance safety of a large-span bridge.

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 relates to the technical field of steel structure construction, and discloses a large-span steel structure high-altitude slippage real-time monitoring mechanism based on multi-sensor fusion, comprising two slippage supports which are slidably arranged on a steel structure slippage track and are used for supporting a large-span steel structure; the detection assembly is movably arranged between the two sliding supports, located at the bottom of the steel structure and used for detecting the midspan curvature of the steel structure; the supporting plate is movably arranged between the two sliding supports and used for supporting and protecting the large-span steel structure; the driving assembly is arranged on the sides, close to each other, of the two sliding supports and used for driving the supporting plate to move at the bottom of the steel structure. The large-span steel structure high-altitude slippage real-time monitoring mechanism based on multi-sensor fusion can effectively solve the problem that in the prior art, a large potential safety hazard possibly exists due to deformation and damage in the slippage construction process of a large-span steel structure.

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 mobile crossing frame capable of automatically unfolding a telescopic cloth net, and relates to the field of crossing frames for power line construction. A traditional electric power line crossing frame is usually built by adopting moso bamboos or steel pipes, and the building mode of the crossing frame is long in construction period and large in safety risk. The automatic net arranging device comprises a U-shaped frame body, a front automatic net arranging mechanism capable of automatically arranging a bearing net forwards, a rear automatic net arranging mechanism capable of automatically arranging the bearing net backwards, a telescopic stay cable and an adjustable connecting frame capable of adjusting a pitching angle and a horizontal rotation angle, wherein the extension length of the bearing net can be flexibly set according to field conditions; and a plurality of rolling shafts are arranged on a cross beam of the U-shaped frame body. The crane can be used as a mobile platform to carry out flexible mobile construction, the construction period is short, the telescopic stay cable can have pretightening force to synchronously extend with the front and rear automatic net arrangement mechanisms, the bearing capacity and flatness of the net blocking platform are enhanced, the adaptability and safety of large-span construction are improved, and the traction resistance of a wire can be reduced through the rolling shafts.

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 discloses a BIM (Building Information Modeling)-based large-span post-tensioned bonded prestressed beam construction method. The BIM-based large-span post-tensioned bonded prestressed beam construction method comprises the following steps: collecting a vibration signal of a working rib and a matt rib reference signal of a matt rib; inputting the dummy rib reference signal into an adaptive filtering algorithm to which phase preserving constraint is applied, and performing noise cancellation processing on the working rib vibration signal to generate a purified pressure wave signal; performing multi-scale decomposition on the purified signal, extracting propagation time delay of the direct wave based on coherence analysis among components, and generating a phase-time delay characteristic matrix; and based on pre-configured geometric parameters of the BIM three-dimensional model, a real-time stress distribution field is calculated through inversion according to the phase-time delay characteristic matrix, and the real-time stress distribution field is synchronously updated to the BIM three-dimensional model. According to the method, the phase distortion problem under noise interference is solved through a physical reference channel and phase preserving filtering, the accuracy of time delay extraction is improved through a multi-path separation technology, and high-precision and high-robustness real-time monitoring of the prestress is achieved.

The invention belongs to the technical field of steel arch building monitoring, particularly relates to a large-span steel arch building monitoring and early warning method and system based on digital twinning, and solves the technical problems that the structural state of a large-span steel arch building cannot be comprehensively and accurately mastered in real time, and early warning and monitoring cannot be comprehensively and timely performed. According to the method, the three-dimensional twinborn model is constructed through the BIM technology, and the sensor data is mapped, so that the real-time data of different nodes of the large-span steel arch building can be intuitively and comprehensively obtained in real time. Compared with a traditional monitoring mode, the building structure state can be visually analyzed on the basis, the monitoring accuracy and comprehensiveness are greatly improved, and a scientific and systematic analysis process is established; through identification of stress data distribution conditions under different working conditions and comparison with material allowable stress, a stress change rate preset value, a safety margin reserved safety margin and the like, whether the structure is abnormal or not can be accurately judged, and an early warning signal is generated in time.

Disclosed in the present invention are a method and system for determining reasonable vertical stiffness of a long-span new highway bridge. The method comprises: by means of a finite element model for an initial design scheme of a long-span new highway bridge, calculating a vertical deflection-to-span ratio and a beam end vertical rotation angle of the bridge under the characteristic combination of a permanent load, a live load, a temperature action, and a wind load; performing checking calculation on indicators for driving safety and comfort on the bridge, indicators for the usage of a beam end bearing and an expansion joint, and indicators for a vertical curve of a route after vertical deformation of a main girder; taking the requirements for the driving safety and comfort on the bridge, the requirements for the usage of the beam end bearing and the expansion joint, and the requirements for the vertical curve of the route after the vertical deformation of the main girder as constraints to decrease or increase bridge design parameters in the finite element model; and determining, as the minimum value of the reasonable vertical stiffness of the bridge, the maximum vertical deflection-to-span ratio and the maximum beam end vertical rotation angle in all schemes satisfying the constraints. The present invention can provide a reliable reference for the reasonable design, economy, and safety of long-span new highway bridges.

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 relates to the technical field of constructional engineering, in particular to a prefabricated large-span reinforced concrete floor capable of being assembled and adjusted. The floor slab comprises a prefabricated reinforced concrete slab with the length extending in the front-back direction, the front side and the rear side of the lower end face of the prefabricated reinforced concrete slab are each provided with a set of lap joint parts extending downwards, and a bottom support assembly fixed to the lower end face of the prefabricated reinforced concrete slab is arranged between the two lap joint parts; the bottom support assembly comprises a plurality of bottom support units which are arranged at intervals in the front-back direction, the bottom support units are symmetrically arranged in the front-back direction with the center of the prefabricated reinforced concrete slab as the center, the lower end of the bottom support unit in the middle is lower than the lower ends of the bottom support units on the two sides, and a prestress inhaul cable is connected between the two lap joint parts. And the lower end of each collet unit is supported and fixed on the prestressed inhaul cable. The bottom support assembly and the prestress inhaul cable are adopted to replace a lower flange and a web, the self weight is light, meanwhile, the lap joint part is arranged, the contact area of the floor and a building structure is increased, stress is reduced, assembling is convenient, and safety is improved.

The invention discloses a large-span concrete structure construction method based on a frequency modulation mass damper, which comprises the following steps: firstly, erecting a formwork body, paving a beam bottom formwork, and then binding beam steel bars; then, profile steel embedded parts are installed, embedded lug plates are welded, and H-shaped steel beams are installed; then, a beam side mold is closed and reinforced; then, a frequency modulation mass damper is installed and welded and fixed, and a weld joint is coated with anti-corrosion and fireproof paint; construction of a structural formwork is conducted on the portion where the frequency modulation mass damper is installed; finally, concrete is poured; and after concrete pouring is completed, the formwork is removed, and construction of the large-span concrete structure with the frequency modulation mass damper is completed. The purpose of saving the construction period is achieved by improving the construction process, the project of reserving a hoisting hole is omitted by installing the damper in place in advance at a time, the risk of leakage of the structural slab due to a construction joint can be avoided, and the purpose of saving the construction period can be further achieved.

The invention relates to the technical field of vibrating equipment, in particular to a multi-point vibrating system for improving the pouring quality of a large-span concrete plate structure, which comprises a truss and a vibrating mechanism, the vibrating mechanism comprises an offset assembly, a lifting execution assembly, a vibrating rod and a lifting driving assembly, a vibrating rod installed on the lifting execution assembly can be guided to be vertically inserted into concrete through the lifting driving assembly, and when the vibrating rod makes contact with a steel bar, and descending resistance is suddenly increased, the lifting arm set guides the lifting execution assembly to be reset to the safe height, and then the horizontal position is adjusted through the offset frame to avoid the steel bar; and the vibrating rod is inserted downwards again to complete concrete vibrating operation, and the problem that an existing vibrating device cannot continue to descend to be inserted into the concrete after the vibrating rod abuts against the reinforcing steel bar is solved.

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 the technical field of civil engineering digitization, and discloses a steel structure physical digital twin model construction method, device and equipment and a medium, the method comprises the following steps: carrying out multi-source point cloud data acquisition on a steel structure, and generating a steel structure complete point cloud model based on the multi-source point cloud data; extracting a complete geometric line model and a section size of the steel structure from the complete point cloud model of the steel structure, and obtaining an actually measured material constitutive of the steel structure through a material property test; establishing a large-span space steel structure finite element model by adopting finite element analysis software based on the complete geometric line model, the section size and the actually measured material constitutive structure of the steel structure; and correcting the finite element model based on the residual error between the measured data of the steel structure and the simulated data of the steel structure output by the finite element model, and taking the corresponding finite element model when the residual error is less than a preset threshold value as the physical digital twinborn model of the large-span space steel structure. According to the method, millimeter-level geometric reduction, real material parameter association, lightweight efficient calculation and dynamic data correction are realized.

The invention discloses a long-span bridge typhoon effect probability prediction method based on physical-data cooperative driving, and the method comprises the steps: obtaining typhoon and typhoon effect monitoring data recorded by a structure health monitoring system, and calculating typhoon characteristic parameters and bridge vibration response parameters; then, taking typhoon characteristic parameters as model input and bridge vibration response parameters as model output, constructing a sample set, and dividing the sample set into a training set and a test set; a deep integration strategy of physical-data cooperative driving is further adopted to adjust a neural network architecture, and a typhoon effect probability prediction model providing response mean value and variance dynamic estimation is constructed; then, based on the divided data set and the established probability prediction model, carrying out model training and response prediction; and finally, carrying out model interpretation analysis by adopting an improved Shapril additive interpretation method. According to the method, the typhoon effect prediction accuracy and uncertainty quantification performance of the long-span bridge can be effectively improved, and the robustness and interpretability of the model are synchronously enhanced.

The invention relates to the technical field of civil engineering and constructional engineering, in particular to a large-span structural member installation deviation intelligent evaluation method, which comprises the following steps of: calculating a difference value between an actual installation coordinate and a design coordinate of each rod member to obtain a coordinate deviation; the coordinate deviation is input into a first calculation and analysis model, and a first deformation response value of each rod piece is obtained; calculating a deformation response coefficient I of each rod piece in a self-weight state, and performing first-stage evaluation; applying an external load to the calculation analysis model II to obtain a deformation response value II and a load coordinate of each component; calculating a deformation response coefficient II of each component in a load state, calculating a difference value between a load coordinate and a design coordinate to obtain a finished deformation value, and performing second-stage evaluation; according to the results of the first-stage evaluation and the second-stage evaluation, judging whether the requirements are met or not; whether the deviation meets the requirement or not is judged through two-stage evaluation, potential safety hazards can be found in time, and structural safety and construction quality are guaranteed.

The utility model relates to the technical field of building construction, and discloses a segmented butt joint construction structure of large-span steel beams, which comprises a plurality of steel beams which are sequentially connected end to end, fixing columns are arranged at the head end of the first steel beam and the tail end of the last steel beam, temporary buttresses are arranged at the joints of the middle steel beams, and the temporary buttresses are connected with the steel beams. And the temporary buttresses are used for supporting and fixing the segmented parts of the steel beam. The temporary buttresses are used for temporarily supporting the sections of the steel beam, the sections of the steel beam are prevented from being broken and collapsed due to gravity, the buckling grooves and the buckling blocks are arranged on the connecting sections of the steel beam for pre-fixed connection, and the sections of the steel beam are pre-fixed under the action of the temporary buttresses. The situation that the position of the steel beam swings randomly when the steel beam is hoisted is avoided, an operator can further reinforce the steel beam on the basis of pre-fixing, the fixing bolts are fixed in the first steel beam and the second steel beam through the operation grooves, and the convenience of mounting and fixing is improved.

The invention discloses a large-span arched steel truss with oblique supports and a construction method thereof, the steel truss is arched, the central structure of the steel truss is a pair of upper chords and a lower chord, the lower chord is located under the middle position of the pair of upper chords, and the two ends of each upper chord exceed the two ends of the lower chord in the chord direction; oblique supporting structures are symmetrically arranged at the two ends of a steel truss and used for supporting and installing the steel truss, and each oblique supporting structure comprises a reinforced steel concrete column, a steel column base, an A-shaped steel column and a back pulling steel rod, and the steel column base is directly or indirectly welded to the top end of a steel rib of the reinforced steel concrete column; the A-shaped steel columns incline upwards in the direction close to the chordwise midpoint of the steel truss, the two ends of the lower portions of the A-shaped steel columns are hinged to the pair of steel column feet respectively, the upper ends of the A-shaped steel columns are hinged to the ends of the lower chords, and the back-pulling steel rods incline upwards in the direction away from the chordwise midpoint of the steel truss, and the upper ends and the lower ends of the back-pulling steel rods are hinged to the ends of the upper chords and the steel column feet respectively. According to the steel truss, deflection deformation can be reduced, the anti-deflection performance is enhanced, the anti-seismic performance is improved, and steel is saved.

According to the method for designing the reasonable arch axis of the large-span arch bridge based on the hybrid calculation algorithm and the self-adaptive load distribution, an analytic equation method, a curve fitting method and an intelligent optimization algorithm are combined, and by selecting the initial arch axis, introducing a dynamic load distribution model and applying a genetic algorithm and a particle swarm optimization algorithm, the reasonable arch axis of the large-span arch bridge is designed. Global and local optimization is carried out, and the optimal shape and load distribution of the arch axis are ensured. And finally outputting design parameters, such as a control point, a bending moment, thrust and the like. According to the method, the design precision, flexibility and safety can be effectively improved, the material utilization rate is optimized, the cost is reduced, and the method is particularly suitable for design of large-span bridges and has high practical value.

The invention discloses an integral dismantling method for a rigid frame bridge hanging basket formwork, and relates to the technical field of bridge engineering construction. The problems that in the prior art, the rigid frame bridge hanging basket formwork dismantling efficiency is low, potential safety hazards are high, and cost is high are solved. The dismantling method comprises the following steps of: pre-burying a winch anchor bolt to anchor a winch; loosening a hanging basket anchor system to separate a hanging basket bottom die from a concrete box girder; arranging four winches to be matched with fixed pulleys; synchronously lifting the hanging basket bottom die for static load test, then synchronously lowering the hanging basket bottom die to the ground, and decomposing and dismantling the hanging basket bottom die on the ground. And the hanging basket truss is disassembled on the bridge floor. The integral dismantling method for the hanging basket formwork of the rigid frame bridge is used for dismantling the hanging basket bottom formwork of the rigid frame bridge, an integral dismantling mode is adopted, high-altitude split operation of the hanging basket bottom formwork is converted into integral ground dismantling, the operation time is shortened, and the dismantling efficiency is improved; the template loss is reduced, and the cost is reduced; aloft work is reduced, and potential safety hazards are reduced. The method is particularly suitable for large-span bridge engineering crossing rivers and seas or expressways.

The invention belongs to the technical field of fast assembly houses, and discloses a container-based house for a large-span structure and a mounting method, a plurality of containers are arranged in two rows, and the two rows of containers are oppositely arranged in pairs; the two opposite containers are connected through an arched roof truss; corner connecting pieces are arranged at the corners of the container; a sliding groove assembly is installed at the top of the container and comprises a sliding groove rail with a sliding groove, a sliding seat is installed in the sliding groove of the sliding groove rail in a sliding mode, a sliding connecting piece is installed on the sliding seat, a fixing bolt ball is arranged at the top of the sliding connecting piece, and the end of the arch roof truss is connected with the fixing bolt ball. According to the invention, the movable installation and repeated disassembly and assembly of the house for the large-span structure can be realized, the problems of bearing horizontal thrust and releasing temperature stress of a large-span building structure supported on the top of the container are solved, and meanwhile, the sliding adjustment connection between the roof truss structure and the support structure can also be realized.

The invention relates to the technical field of pumped storage power stations, in particular to a large-span pumped storage power station tunnel construction geological risk safety control method. The large-span pumped storage power station tunnel constructed in the inclined rock stratum in the trend is divided into three parts in the trend direction, firstly, the half side with the relatively high trend is grooved, then a low-trend area is excavated and supported in time, the inclined rock stratum outside the grooving area is made to conduct creep displacement towards the grooving area during the period, and the inclined rock stratum outside the grooving area is cut into the large-span pumped storage power station tunnel. The creep quantity of the rock stratum mostly occurs in the early stage which is just revealed, and the creep quantity of the inclined rock stratum in the high inclination area in the later stage can be reduced after the inclined rock stratum is constructed after a large amount of creep deformation. And then the residual creep deformation amount is obtained according to the creep characteristic curve of the inclined rock stratum, so that the high-inclination area is accurately expanded, and it is guaranteed that the tunnel section can still meet the requirement after final creep deformation of the inclined rock stratum. The method is particularly suitable for tunnel construction conditions that the tunnel section is large and inclined strata are affected by bias pressure, and construction is easy and beneficial to popularization.

The invention discloses a steel plate floor support plate and an implementation method, and aims at solving the problems that a traditional floor support plate is insufficient in rigidity and strength, large in steel consumption, complex in construction, low in material utilization rate and the like. The floor support plate comprises a wide upper flange (the minimum width is larger than or equal to 30 mm), a wave-shaped reinforcing steel bar web member, a lower chord reinforcing steel bar and a profiling thin-bottom steel plate, the wide upper flange is of a combined type or thin steel plate type or trapezoidal steel pipe structure, and a side plate forming an inclination angle with a vertical shaft enhances the out-of-plane stability; the inclination angles of the steel bar web members are consistent with those of longitudinal ribs (trapezoidal ribs, closed inverted triangular ribs and the like) of the upper flange side plates and the profiled thin-bottom steel plates, so that line-surface contact welding is realized; the profiled thin-bottom steel plate is provided with longitudinal ribs and transverse ribs, so that the overall rigidity is improved; the lower chord steel bar adopts a double-layer design to strengthen node stress. According to the implementation method, industrial production is achieved through cold roll forming, automatic resistance welding and other processes. A traditional triangular truss is optimized into a trapezoid and four-side box type space structure, the bending rigidity is remarkably improved (the inertia distance between the upper flange and the profiling thin bottom steel plate is increased by 40% or above), the steel consumption is reduced by about 30%, the connection reliability is enhanced, meanwhile, the concrete consumption is reduced, the construction process is simplified, and the structure is suitable for various building scenes such as large span and heavy load.

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 an exhibition hall roof adopting large-span folded-surface arch trusses and a construction method of the exhibition hall roof, a plurality of large-span folded-surface arch trusses are sequentially connected, and each group of supporting mechanisms are respectively arranged at two ends of each corresponding large-span folded-surface arch truss; the (n / 2 + 1) th truss and the (n / 2) th truss of adjacent large-span folded-surface arched trusses are connected through knuckle bearings, and the other two adjacent large-span folded-surface arched trusses are connected through connecting flanges; the large-span folded-surface arched truss comprises a main truss and two sets of wing trusses, and the two sets of wing trusses are hinged to the two opposite sides of the main truss respectively. The main truss is of an inverted triangular space truss structure; the wing truss is of a cantilever space structure. The exhibition hall roof is small in steel consumption in design, good in economic benefit, high in repeated utilization rate and high in industrial assembly degree.