3249 results about "Bridge deck" patented technology

The invention relates to the technical field of bridge engineering construction, in particular to a bridge deck concrete flatness detection and correction method, which comprises the following steps: synchronously acquiring bridge deck point cloud, elevation and crack data through a three-dimensional laser scanner, a laser profiler and an ultrasonic sensor, and fusing to generate a three-dimensional digital model; defects such as local protrusions and wave deformation are recognized based on an intelligent analysis algorithm, causes are analyzed, and correction process parameters such as milling, cladding, grouting or ultrathin layer pouring are generated in a targeted mode; operation is executed through equipment such as a finish milling machine, closed-loop control is realized by combining real-time monitoring of a laser profiler, and finally, a traceable digital file is formed through laser detection, inspection and acceptance of an unmanned aerial vehicle and data archiving. By means of the method, the pass percent of the flatness of the bridge floor can be increased to 94% or above, the maximum height difference is controlled within 3 mm, the maintenance period of the bridge is prolonged, and the maintenance cost is reduced.

The invention relates to the technical field of hogging moment region calculation, in particular to a hogging moment region long-term rigidity prediction method for a steel-concrete composite beam bridge. The invention discloses a long-term rigidity prediction method for a hogging moment area of a steel-concrete composite beam bridge. Comprising the steps that a welding stud connecting piece degradation time-varying model and a concrete bridge deck degradation full-time-domain model under the corrosion-fatigue coupling effect are constructed according to test data, and a steel-concrete composite beam bridge hogging moment area rigidity degradation model, steel-concrete composite beam bridge hogging moment area long-term rigidity prediction and the like are constructed. In the process of predicting the rigidity of the hogging moment area of the steel-concrete composite bridge, the deterioration mechanism of a welding stud connector under the corrosion-fatigue coupling effect is considered, the pitting corrosion condition under the environment influence and the welding stud crack condition under the vehicle load influence are considered, the influence of bridge deck slab cracks is considered in the pitting corrosion condition, and the rigidity of the hogging moment area of the steel-concrete composite bridge is predicted. In addition, the mutual relation among the welding stud pitting corrosion influence, the welding stud crack influence and the bridge deck crack influence is considered, and the rigidity of the hogging moment area of the steel-concrete combined bridge is accurately analyzed.

The invention relates to the technical field of ultra-high performance concrete, particularly discloses a fatigue performance evaluation method for a steel-UHPC combined bridge deck slab, and is used for solving the problem that the fatigue damage evolution process of the steel-UHPC combined bridge deck slab in the life cycle is difficult to accurately predict due to the fact that an existing evaluation method does not consider the influence of structural fatigue performance degradation. And the evaluation result is likely to be unsafe. According to structural parameters and material attributes of a reinforced UHPC layer, fatigue performance evaluation of a reinforced UHPC component under the action of an axial tension fatigue load is carried out, fatigue performance analysis of a stud connecting piece in ultra-thin UHPC under the action of a shear fatigue load is carried out, bending fatigue performance analysis of a steel-UHPC-pavement composition board is carried out based on a five-point bending test, and the bending fatigue performance of the steel-UHPC-pavement composition board is analyzed. And a time-varying fatigue analysis framework of the steel-concrete composite effect degraded steel-UHPC composite bridge deck is established, so that the evaluation result is more reliable, and the risk of unsafety is reduced.

The invention relates to the technical field of bridge construction monitoring, and provides a digital twinborn digital-intelligent construction method and system for paving and erecting all-in-one machines. Under the construction operation working condition that a PK type section steel beam and a concrete prefabricated bridge deck slab are overlapped later, according to obtained construction monitoring sensing information of all the paving and erecting all-in-one machines in the main bridge construction process, the construction monitoring sensing information of all the paving and erecting all-in-one machines is obtained; oPC data is integrated to form logic and physical information and construction environment data information of the laying and erecting all-in-one machine, and modular association simulation driving is used for conducting three-dimensional simulation on main beam construction and associating construction monitoring data information through PLC programming data processing. The working posture and physical information state matching of each simulation model and dynamic construction simulation of the construction environment are completed, digital twin digital-intelligent construction of actual physical data is achieved, digital-intelligent development of bridge construction is improved, and the problem that in the prior art, under the PK type steel beam and prefabricated bridge deck slab post-overlapping asynchronous construction condition, the construction efficiency is greatly improved is solved. And the intelligent safety monitoring technology of the construction equipment and the steel beam structure is immature.

The invention belongs to the technical field of infrastructure structures and materials, and discloses an intrinsic self-prestress ECC material, a surface layer structure prepared from the intrinsic self-prestress ECC material and application of the intrinsic self-prestress ECC material. A low-dosage volume expansion component and a building and curing combined strategy are utilized, the bottleneck that self-stress and a construction window period are not coordinated is broken through, the highest free expansion deformation of the intrinsic self-prestress ECC material in the temperature and humidity curing process is controlled to range from 1500 mu epsilon to 10000 mu epsilon, the later-period service free volume deformation is kept to be 55% higher than the early-period highest free expansion deformation, and the service life of the intrinsic self-prestress ECC material is prolonged. And the dual requirements of intrinsic self-prestress and construction windows are innovatively met. The maintenance-free seamless ultrathin target of the ECC surface layer structure is achieved through high-performance intrinsic self-prestress and self-healing. The method is widely applied to the fields of ocean ultra-thin large-buoyancy floating bodies, road surfaces, bridge floors, airport runways, ultra-thin box culverts, concrete panels, pumped storage power station panels, anti-seepage panels, floor panels, canal linings, tunnel linings, old structure updating and repairing and the like.

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention provides a maglev traffic track structure and a construction method thereof. The maglev traffic track structure comprises a bridge deck, a maglev track assembly and an induction plate assembly. The magnetic levitation rail assembly comprises a magnetic levitation rail, a hexagon nut, a gasket, a thin nut and a screw. The induction plate assembly comprises an iron core, an aluminum plate, shear nails and screws. The iron core is vertically welded and fixedly connected with the shear nails, the shear nails and the bridge deck are cast and anchored into a whole, the iron core is arranged on the upper end face of the bridge deck, and the aluminum plate is installed on the upper end face of the iron core through screws; the construction method comprises the steps that the prefabricated bridge deck slab is modularly poured in a factory, the magnetic levitation rail is installed, adjusted and locked in the factory, the levelness and straightness of the magnetic levitation rail are measured again, and the bridge deck slab is installed on a construction site. According to the invention, high-precision, high-efficiency and low-cost installation of the maglev traffic track is realized.

The utility model provides a concrete pouring and distributing device for bridge construction, and relates to the technical field of bridge construction equipment.The concrete pouring and distributing device comprises a supporting frame used for being erected on a bridge deck system pouring formwork, an inclined discharging groove is slidably connected to the supporting frame, and a driving assembly used for driving the inclined discharging groove to move on the supporting frame in the transverse bridge direction is arranged on the supporting frame; the bottom of the inclined discharging groove is evenly provided with a plurality of discharging openings, the discharging openings are connected with a material distribution hose, the lower end of the material distribution hose is provided with a moving trolley, the bottom of the inclined discharging groove is fixedly provided with a guide frame, and the moving trolley is connected with the guide frame in a sliding mode. Concrete falls to different positions of a bridge floor along a plurality of discharging ports of the inclined discharging groove and the material distribution hose, multiple vehicle-mounted concrete pumps do not need to work at the same time, the pumping cost is effectively reduced, the driving assembly drives the inclined discharging groove to move on the supporting frame in the transverse bridge direction, and workers pull the lower end of the material distribution hose to move in the longitudinal bridge direction through the moving trolley. Labor is saved, and the labor intensity of workers is reduced.

The invention discloses a steel structure bridge welding device and method, and relates to the technical field of steel structure welding, the steel structure bridge welding device comprises a welding main body and a moving assembly for moving the welding device; the hoisting assembly is used for clamping and moving the U-shaped rib plate; the unloading assembly is used for unloading the welded bridge deck steel plate; the pushing assembly is used for pushing the welding device to move; the adjusting assembly is used for adjusting the angle of the welding device. A double-sided toothed plate is pushed through an electric telescopic rod, a telescopic plate is pushed through a linkage gear, the position of a storage box is adjusted, the output end of a welding gun is aligned with the welding face of a U rib and a bridge deck slab, then an electric telescopic frame is started, the joint of the U rib and the outer wall of the bridge deck slab is welded, and the problem that a traditional steel structure bridge welding device is inconvenient to use when used is further solved. And due to the fact that the limitation of a device for welding the U-shaped rib plate and the inner wall of the bridge deck steel plate is large, an additional device is needed for cooperation subsequently, and the problem that the U-shaped rib plate and the surface of the bridge deck steel plate are welded is solved.

The invention relates to a double-layer steel truss arch bridge mounting process. The double-layer steel truss arch bridge mounting process is characterized by comprising the following specific mounting processes: S1, field arrangement; s2, mounting on-shore and in-water temporary piers; s3, assembling the truss pieces and the bridge deck system; s4, mounting a main beam; s5, mounting an arch rib bracket; s6, assembling the arch ribs; s7, arch rib installation; and S8, the temporary structure is dismantled, and construction is completed. The construction sequence of mounting on-shore and in-water temporary piers, assembling truss pieces and a bridge deck system, mounting main beams and mounting arch ribs is sequentially carried out on the double-layer steel truss arch bridge, temporary support sets are adopted for auxiliary construction in the construction process of the main beams, and the laying sequence of the main beams is fully combined with the composition and erection positions of temporary supports; the main beam is laid in the side span direction by taking the revetment as a reference, so that the temporary support and the main beam are laid more scientifically; in addition, during installation of the arch rib sections, hoisting is carried out in the mode that the two ends are firstly arranged and then the middle is arranged, and safety and stability during installation of the arch rib sections are guaranteed.

The invention discloses an intelligent damage monitoring control method and system for a steel-UHPC (Ultra High Performance Concrete) combined bridge deck slab. The intelligent damage monitoring control method comprises the following steps: arranging a multi-source sensor in a key stress area of the steel-UHPC combined bridge deck slab; the data acquisition module synchronously acquires multiple physical quantity signals monitored by each sensor; the feature extraction module captures deep correlation characteristics among physical quantities to obtain enhanced feature vectors; the state recognition and prediction module dynamically recognizes the health state of the structure according to the enhanced feature vector and predicts the crack evolution trend; the active control module deduces local pressure stress needing to be applied to active regulation and control of the steel bridge deck slab and the UHPC according to the intelligent identification and evolution prediction result; after regulation and control are executed, the feedback optimization module collects operation data and feedback information of each module, optimizes and adjusts parameters and control strategies of the system, and feeds back the optimized parameters and strategies to each module to form a closed-loop self-adaptive control mechanism; according to the invention, full-life-cycle health management of the steel-UHPC combined bridge deck can be realized.

The invention discloses a suspension bridge double-layer different-sag four-main-cable extension structure and an extension method. The extension structure is characterized in that a lower-layer extension stiffening beam and an existing suspension bridge stiffening beam are arranged in parallel up and down and are connected through web members to form a double-layer truss structure; the lower-layer extension stiffening beam transmits a load to the newly-added main cable through the beam bottom transverse suspension cable cross beam and the newly-added sling; the newly-added main cables are located on the side, far away from the center line of the bridge axis, of the existing main cable and arranged side by side, the newly-added main cables are vertically supported on the expanded bridge tower through newly-added vertical main cable saddles, and pulling force is transmitted to the newly-added second anchors through side span newly-added second cable saddles and anchoring systems. The midspan point of the newly-added main cable is located below the upper-layer bridge floor, the vertical span ratio is larger than that of an existing main cable, and the number of materials of the newly-added main cable is reduced. The newly-added slings and the existing slings are longitudinally arranged at intervals and are different in longitudinal and transverse positions, so that the problem that the local fatigue stress of the steel structure at the anchoring positions of the slings and the steel beams is large is solved; the sags of the four main cables are different, so that the dynamic stability of the suspension bridge is improved.

The invention discloses fiber reinforced concrete for bridge deck pavement and a preparation method thereof, and belongs to the technical field of concrete. The fiber reinforced concrete is prepared from the following raw materials: Portland cement, modified basalt fiber, a slow-release mineralizer, a stress-oriented dispersing aid and the like. The modified basalt fiber is a basalt fiber which is subjected to amino silanization through a silane coupling agent KH-550 and then is catalytically grafted with ethylenediamine tetraacetic acid and hydroxyethyl methylacrylate through DCC (dicyclohexylcarbodiimide); the slow-release mineralizer comprises calcium sulphoaluminate and silicon-based coated nano calcium sulfate; the silicon-based coated nano calcium sulfate is core-shell structure powder formed by coating a nano calcium sulfate core material with a silicon dioxide shell layer; the concrete is strong in interface bonding, excellent in dynamic fatigue resistance, good in durability and stable in volume, and the problem that the mechanical property, the durability and the dynamic anti-interference capability of the concrete cannot be considered at the same time is solved.

The invention discloses a bridge expansion joint abnormity diagnosis method and system based on voiceprint recognition and deep learning, and the method comprises the steps: arranging sensors on the bridge surface and under the bridge of an expansion joint, and obtaining the video data of a vehicle passing through the expansion joint and the audio data of the vehicle passing through the expansion joint; constructing a vehicle seam crossing discrimination model based on a neural network, inputting the video data of the vehicle passing through the expansion joint into the vehicle seam crossing discrimination model, and detecting a vehicle seam crossing scene; identifying a single vehicle seam crossing event in the vehicle seam crossing scene by adopting a data cleaning algorithm; cutting from the audio data of the expansion joint passing of the vehicle to obtain a bicycle seam passing audio of a time period corresponding to the bicycle seam passing event; extracting a Mel spectrogram of a single-vehicle seam-crossing audio frequency, and carrying out feature coding on the Mel spectrogram to obtain an enhanced Mel spectrogram; and constructing an expansion joint anomaly diagnosis model based on an unsupervised linear self-encoding network, inputting the high-dimensional Mel spectrum feature vector of the enhanced Mel spectrum into the expansion joint anomaly diagnosis model, and identifying the abnormal state of the expansion joint.

The invention belongs to the technical field of roads and bridges, and discloses a bridge floor icing traffic safety intelligent monitoring and early warning method, which comprises the following steps: S1, bridge floor time-varying temperature multi-source prediction based on thermal environment change; s2, predicting the time-varying friction coefficient of the frozen bridge floor based on the temperature field; s3, icing driving safety prediction based on the friction coefficient and the line condition; and S4, bridge deck icing traffic safety comprehensive speed-limiting intelligent early warning is carried out. The core innovation of the invention lies in a full-chain intelligent early warning system, through a closed-loop process of multi-source temperature prediction, dynamic friction modeling, driving safety evaluation and intelligent speed limit decision, the early warning precision and practicability are significantly improved, and through a technical path of data driven prediction, accurate safety evaluation and intelligent decision output, the early warning precision and practicability are improved. The technical performance, the economic benefit and the social safety are all broken through, and a good solution is provided for road traffic safety in winter.

The invention relates to the technical field of bridge engineering, in particular to an in-service steel bridge U rib and top plate crack double-face welding repairing method and application thereof. The method comprises the steps that the position of a crack is determined, a bridge deck pavement layer above the crack is removed, and the surface of a bridge deck slab in a crack area is cleaned; flattening the bridge deck slab on the two sides of the crack, and fixing the flattened bridge deck slab; u-rib internal welding construction process holes are formed; u rib inner welding reinforcing welding and weld leg increasing welding are carried out in an inner corner area where the U rib with the cracks is connected with the top plate; sealing and repairing the construction process hole; carrying out carbon arc air gouging on the crack above the bridge deck slab, and forming a gouging groove in the bridge deck slab; and polishing and multi-layer and multi-pass welding are carried out on the planed groove. The method is fused with an internal welding technology, is a comprehensive repair scheme with root treatment, double reinforcement, controllable deformation and reliable quality, thoroughly overcomes the technical defects of treatment of symptoms, no treatment of root causes, easy secondary damage, poor reliability and the like in the prior art, and remarkably prolongs the service life and the safety performance of the in-service steel bridge.

The invention discloses an epoxy resin tack coat oil material suitable for a steel bridge deck, which constructs a multi-scale toughening composite system through the synergistic effect of an epoxy-terminated polyurethane elastomer toughening agent (molecular-scale chemical grafting) and a nano-scale elastomer filler (nano dispersion toughening), and solves the problem of rigidity-flexibility imbalance of the traditional epoxy tack coat oil. The material has the advantages of fast curing (surface drying at 25 DEG C is less than or equal to 4 hours), high toughness (the elongation at break is greater than or equal to 250%) and excellent weather resistance (the performance retention rate is greater than or equal to 85% after ultraviolet aging for 500 hours), and is suitable for interlayer interface bonding of steel bridge deck pit slot and crack repair. According to the preparation method, uniform dispersion and interface chemical bonding of the nanofiller are achieved through a segmented stirring process, the comprehensive performance of the material is remarkably improved, and the important engineering application value is achieved.

The invention relates to the technical field of steel-concrete composite beams, and discloses a steel-concrete composite beam bridge deck reinforcing device which comprises a sealing plate, a first hydraulic cylinder, a first supporting plate, a first polished shaft, a second supporting plate, a first support, a first rotating arm and a second hydraulic cylinder. In the using process, when one side of the top face of the web beam is subjected to overload pressure, the second supporting plate on the same side can be pressed downwards, then the first supporting plate on the same side is made to move downwards, and therefore the moving ends of the first hydraulic cylinders on the same side are made to return. And at the moment, hydraulic oil in the rodless cavities of the first hydraulic cylinders on the same side can enter the rodless cavities of the second hydraulic cylinders on the same side, and then the moving ends of the second hydraulic cylinders on the same side stretch out. And then, under the support of the first support on the same side, the first rotating arms on the same side can deflect towards the direction of the web beam. Due to the fact that hydraulic pressure is adopted as a power source, enough supporting force can be provided for the bottom face and the two side faces of the web beam, and then the anti-overturning performance is improved.

The invention relates to the technical field of bridge pavement, in particular to a concrete bridge anti-crack bridge deck pavement structure and a pavement method. A high-elasticity modified asphalt mastic macadam concrete upper surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a fiber high-strength dense water asphalt concrete lower surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a high-toughness asphalt sand stress absorbing layer, a fiber waterborne epoxy anti-cracking waterproof bonding layer and a C50 fiber concrete anti-freezing and anti-cracking layer are sequentially arranged from top to bottom. The durability of the bridge deck pavement structure is improved, and the problem that the service life of the bridge deck pavement structure is short is solved.

The invention discloses a bridge deck system multi-sub-project integrated construction process optimization method. The method comprises the following steps: step 1, optimizing a process based on a BIM (Building Information Modeling); step 2, carrying out combined measurement by adopting GNSS-RTK and laser scanning; 3, bridge deck pavement construction and expansion joint installation are conducted on the basis of the combined measurement result; 4, the paver is linked with the reserved groove for positioning, the flatness error can be effectively controlled, and the bridge deck pavement quality is guaranteed; 5, guardrail modular construction is carried out; sixthly, seamless connection, layered backfilling and dynamic compaction are conducted on the butt strap behind the abutment; 7, whole-process environmental protection and finished product protection; 8, performing three-dimensional scanning comparison; step 9, block chain data archiving; the method has the beneficial effects that construction simulation, sequence adjustment and dynamic monitoring are carried out based on the model optimization process logic, the problems of process crossing and construction period conflict can be recognized and eliminated by simulating the construction process in advance, accurate positioning of each subentry project is ensured, and the overall coordination of construction is improved.

The invention provides a fatigue performance evaluation method and system for a U rib of an orthotropic steel bridge deck slab, and relates to the technical field of U rib fatigue performance evaluation, and the method comprises the steps: constructing a U rib model, setting a load and environmental parameter working condition combination, simulating residual stress evolution, and screening out main control parameters; a residual stress change coefficient theoretical equation is constructed, and a final formula is obtained through processing; the main control parameters are combined, the welding process without cyclic load is simulated, and initial values of the characteristic parameters are extracted; finding out the most unfavorable combination, simulating stress evolution under the action of the most unfavorable combination, extracting a final value, comparing the final value with an initial value to obtain a variable quantity, generating a fatigue comprehensive index, and comparing the fatigue comprehensive index with a preset threshold value to evaluate the fatigue performance of the U rib. The method disclosed by the invention reveals a core mechanism that residual stress, load and environmental factors cooperatively change the stress state of the U rib, provides a solid theoretical support for evaluation of the fatigue performance of the U rib, accurately quantifies the influence of main control parameters on the fatigue performance of the U rib, and remarkably improves the evaluation result of the fatigue performance.

The invention discloses an ultra-precision global bridge rotation angle measurement method, and relates to the technical field of angle measurement. The method comprises the following steps: continuously shooting a bridge motion image sequence, and recording timestamps; key points on the bridge deck slab are selected through a feature detection algorithm, a spatio-temporal data matrix is constructed, and data standardization processing is carried out. Linear principal component analysis is adopted to extract global features of overall movement of the bridge deck; and extracting local nonlinear motion characteristics in the residual error through nonlinear principal component analysis. And calculating the displacement of the feature points based on the reconstruction matrix in combination with an lk optical flow method. A least square method is adopted to fit displacement data, and an angle is calculated through an arc tangent function on the basis. The method has the characteristics of high precision and global coverage, is suitable for the fields of bridge health monitoring, safety evaluation and the like, and can effectively capture the overall and local motion characteristics of the bridge.

The invention discloses an intelligent jacking system for bridge construction. The intelligent jacking system comprises a data acquisition module, a control calculation module, an execution driving module and a self-learning optimization module. The data acquisition module acquires pressure value and displacement value data between the hydraulic oil cylinders and the bridge floor in real time to generate a pressure-displacement data matrix; the control calculation module calculates real-time stress and settlement state information of the bridge pile through an intelligent control algorithm library based on the matrix; and the execution driving module calls a preset control library according to the state information and generates a corresponding control instruction to drive the hydraulic system. And the self-learning optimization module dynamically optimizes control parameters by constructing a learning model of equipment working data.

The invention relates to the technical field of connection structure testing, in particular to a bridge deck slab dry joint connection structure testing method which comprises the following steps: preparing a bridge deck slab test piece containing a steel structure embedded dry joint; building a testing device, and arranging strain, displacement and pressure sensors in a dry joint area; carrying out a graded loading test, including static loading to 1.5 times of the designed bearing capacity and dynamic cyclic loading; an environment simulation test is carried out, and repeated loading is carried out in a temperature and humidity circulation box simulation environment; data are evaluated through a multi-source data fusion optimization algorithm model, and indexes such as flexural rigidity and shear rigidity are calculated; in addition, a construction stage simulation test is added, and the alignment deviation and the filling compactness of the components are monitored. According to the method, the structural performance can be comprehensively evaluated, key indexes can be accurately evaluated, durability degradation can be scientifically predicted, construction simulation is innovated, test conditions are guaranteed to be consistent, visualization and verification are achieved, and the problem of limitation of a traditional test method is effectively solved.

The invention belongs to the technical field of industrial detection, and provides a low-temperature fatigue crack propagation life prediction method and system based on a steel bridge deck, and the method comprises the steps: judging whether the crack direction deflection risk assessment needs to be started or not through the sharp reduction of steel plasticity and the non-uniform analysis of local stress gradient; if yes, the crack direction deflection risk of the steel bridge deck is evaluated by analyzing the grain orientation difference and the strengthening phase of the welding seam and the HAZ area; if the risk is high, a stress gradient gentle area is determined through a weld toe stress gradient cloud picture, a resistance-gradient coupling equation is established according to the minimum resistance principle and in combination with the stress gradient, and a crack deflection path is determined; dividing the crack crossing area according to the crack deflection path, calculating the actual propagation rate of the crack by combining the path proportion and stress gradient distribution of each stress gradient area after division, and correcting the life prediction output result, thereby improving the crack propagation path prediction precision and the fatigue life prediction evaluation precision.

The invention discloses a building construction temporary steel trestle bearing capacity detection device and a detection method thereof, and relates to the technical field of building bridge bearing capacity detection.The building construction temporary steel trestle bearing capacity detection device comprises a bottom plate, a detector body and supporting legs fixedly installed on the periphery of the bottom of the bottom plate; an inclined rod is fixedly connected to one side of the top of the bottom plate, a fixing plate is installed on one side of the inclined rod, a supporting column is fixedly connected to the bottom of the inclined rod, an annular spherical shell sleeve is fixedly connected to the top end of the inclined rod, a supporting assembly is arranged on one side of the fixing plate, and an adjusting assembly is arranged on the other side of the fixing plate. The supporting assembly comprises connecting plates which are symmetrically arranged up and down, and one side of the interior of each connecting plate is fixedly connected with a one-way screw rod, so that the problems that the position of the detector is not fixed during detection, and the bridge floor vibrates during bridge load detection, so that the vibration of the detector is possibly caused, and the detection efficiency is improved are solved. And the accuracy of the pressure needle detection structure is influenced.

The invention discloses an unmanned aerial vehicle bridge detection method based on machine vision. According to the method, an unmanned aerial vehicle is used as an autonomous mobile platform, and full-coverage and high-resolution image data acquisition of structural surfaces such as a bridge deck, a beam body and a bridge pier is realized through systematic task planning. The collected data is processed by a motion recovery structure and a multi-view three-dimensional algorithm to generate a high-precision three-dimensional live-action model and a digital orthophoto map. On the basis, a deep learning target detection algorithm is adopted to perform intelligent analysis on the image, apparent defects such as cracks, spalling and corrosion are automatically identified, positioned and classified, and accurate quantification of parameters such as crack width and spalling area is realized. According to the method, the problems of high risk, low efficiency, high subjectivity, existence of detection blind areas and the like in traditional manual detection are effectively solved, and key technical support is provided for digital and intelligent transformation of bridge operation and maintenance management.

The invention relates to the field of asphalt production equipment, in particular to an ultrathin bridge deck pavement high-performance asphalt mixture production device and process, and the ultrathin bridge deck pavement high-performance asphalt mixture production device comprises a mixing barrel which is connected to a base; the top and the bottom of the mixing barrel are respectively connected with the barrel cover and the discharge pipe; a mixing mechanism and a plurality of solid material feeding ports are arranged on the barrel cover, and the mixing mechanism is inserted into the material mixing barrel; the mixing mechanism is connected with a power mechanism arranged on the barrel cover; a matrix asphalt spraying mechanism is connected into the discharging pipe; the upper end of the matrix asphalt spraying mechanism is inserted into the mixing barrel; a heating mechanism is arranged at the bottom of the mixing barrel. The matrix asphalt spraying mechanism is arranged below the mixing barrel, and matrix asphalt can be sprayed into the mixing barrel through the matrix asphalt spraying mechanism, so that the matrix asphalt is headed and mixed with various fixed reinforcing materials falling from top to bottom, and the mixing uniformity of the fixed reinforcing materials and the matrix asphalt is improved.

Disclosed in the present invention is a spatial three-dimensional suspended corridor, comprising a suspended corridor that connects indoor floor passageways, wherein diagrid columns are provided on all edge portions of the indoor floor passageways; the suspended corridor comprises several fixed segments and several bridge deck segments from bottom to top; and the fixed segments or corner segments are all connected to the corresponding bridge deck segments by means of node connecting components. In the present invention, by means of some implementable tests and on the basis of having a preliminary understanding of the stress performance of a corridor structure, a corridor simulation model is also established, parameters of the model are continuously optimized for repeated debugging, preliminary stress performance calculations are then performed and compared with results of some previously conducted tests, and if results are quite similar to the test results, this proves that the model is relatively optimal, that is, an optimized model is obtained, and then this model is used to analyze other more complex performances of the corridor. The optimization objective of the present invention is to make the structure and stress of an aerial corridor safer, more reliable and more comfortable.

The invention provides a multi-mode intelligent cooperative suppression method and system for wind vibration in a cable-stayed bridge construction period, and relates to the technical field of cooperative control, and the method comprises the steps: mapping three-dimensional wind speed vector field data and a strain field to a unified three-dimensional space-time grid coordinate system, and carrying out the screening to generate a composite risk focus coordinate set; defining a weighted Voronoi subdivision weight according to main beam rigidity distribution and path probability density, and generating a responsibility partition set; establishing a damping force-current-vibration response empirical mapping model, and solving an optimal current sequence through model prediction control; bridge floor acceleration response data after vibration suppression are monitored through an MEMS accelerometer array, and an optimized control strategy is formed; model parameters are updated online by using MAML meta-learning, and cross-section migration deployment of the model is realized through lightweight adjustment, so that multi-mode intelligent collaborative suppression of wind vibration during the construction period of the cable-stayed bridge is completed. According to the method, multi-mode intelligent cooperative suppression of wind vibration in the construction period of the cable-stayed bridge is achieved, and the stability and safety of a bridge structure are ensured.