4932 results about "Bridge deck" patented technology

The invention relates to the technical field of road engineering, in particular to a construction positioning method and system for simulation equipment in a steel bridge deck pavement twinning scene, and the method comprises the steps: obtaining the positioning information and construction data of a construction site in real time, and constructing a construction site data set; performing primary processing on the construction site data set through a positioning algorithm to obtain a positioning position and construction dynamic characteristics of equipment; based on a GIS technology and a BIM architecture, constructing a three-dimensional twinborn scene model of the steel bridge deck, and numbering the three-dimensional model according to bridge deck pile numbers and pile-by-pile coordinate information; and matching the processed equipment positioning position data with the three-dimensional twin scene, and displaying the real-time position and the movement track of the equipment through a model. According to the invention, the problem of inaccurate positioning data caused by signal interference in the steel bridge deck pavement construction process is effectively solved, the accurate monitoring of the equipment position and the construction track is realized, and the comprehensive monitoring capability of the construction progress and quality is improved.

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.

To provide a technique for supporting structural calculation of a deck plate used in a roof structure, which can reduce the complexity of management by a user.SOLUTION: An information processing system 1 includes an information processing terminal 12 having a display device 305 and a server 11 connected to the information processing terminal 12 via a communication network 13A. The server 11 includes: a reception unit 21 configured to receive deck plate information 200; a storage unit 20; a calculation unit 22 configured to perform structural calculation of the deck plate based on the deck plate information 200 and store calculation results in the storage unit 20; and an output unit 23 configured to transmit the calculation results to the information processing terminal 12 and cause the display device 305 to display the calculation results. The deck plate information 200 includes information 200C on material, cross-sectional performance, beam support method, support distance, and acting load of the deck plate.SELECTED DRAWING: Figure 2

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 relates to the technical field of steel bridge deck system disease detection, in particular to a steel bridge deck system disease detection method and system and a construction method of the steel bridge deck system disease detection method and system. Attributes of a steel bridge deck system entity are mapped into a digital twinborn model of a virtual space by using a digital means, so that steel bridge deck system disease data are analyzed more comprehensively; the virtual service state analysis of the current steel bridge deck system entity and the prediction of the formation and development degree of the steel bridge deck system diseases are realized through the Internet of Things technology and big data processing. In the process of predicting the formation and development degrees of steel bridge deck system diseases, steel bridge deck system entity monitoring data are updated in a digital twinborn model and a steel bridge deck system twinborn database in real time by using the Internet of Things technology, so that accurate establishment of the digital twinborn model and accurate mapping of total data are realized; meanwhile, the virtual test model accurately simulates the service state of the steel bridge deck system, and it is ensured that the steel bridge deck system disease development model has credibility and reference in predicting the formation and development degree of the steel bridge deck system diseases.

The invention relates to a suspended printing reinforced concrete bridge, a construction device and a printing method. The bridge comprises a pier, a variable cross-section beam, a bridge deck slab and longitudinal and transverse steel bars. The bridge pier is firstly printed, and then the variable cross-section beam and the bridge deck are printed. The variable cross-section beam is printed layer by layer from bottom to top, the upper layer is suspended and lengthened layer by layer compared with the lower layer, and longitudinal and transverse reinforcements are laid between layers. The construction device comprises a rail system, a frame system, a formwork system and a printing system, the frame system provides a working platform for the formwork system and the printing system, the formwork system adopts a suspended formwork to provide support for suspended printing of the variable cross-section beam, the printing system adopts a manipulator to install steel bars, and an extrusion head is adopted to extrude and stack and print concrete. According to the variable cross-section beam bridge, direct layered printing can be achieved, suspended printing of reinforced concrete is achieved through the suspended formwork system, the working procedure is simple, and the variable cross-section beam bridge is suitable for site construction.

The invention relates to the technical field of bridge monitoring, in particular to an intelligent bridge structure health monitoring and early warning device which comprises a monitoring base, a supporting mechanism is arranged at the center of the top of the monitoring base, a monitoring top plate is arranged above the supporting mechanism, and a vibration monitoring module is arranged at the top of the supporting mechanism. A distance monitoring module is arranged in the supporting mechanism, an offset monitoring module is arranged on the outer side of the monitoring base, and a protection module is arranged on the outer side of the monitoring base. The vibration sensor, the first infrared distance measuring sensor and the second infrared distance measuring sensor are arranged in the monitoring device, the distance change and the relative position deviation between the bridge support and the bridge deck system are monitored, the vibration condition of the bridge deck system is monitored, the structural health condition of a bridge is comprehensively monitored, and the monitoring efficiency is improved. Therefore, tiny damage and abnormal change of the bridge structure can be found in time, and the bridge accident rate is reduced.

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 relates to a construction method of an anti-typhoon sea wave sea-crossing steel trestle and platform adjacent to a residential building. The construction method comprises the steps that firstly, deep fusion application of BIM and VR is conducted; step 2, surveying and setting out; step 3, embedding steel bars and pouring strip-shaped concrete; fourthly, the steel pipe piles are transported and lengthened; fifthly, steel pipe piles are driven; sixthly, parallel connection and diagonal bridging construction is conducted; seventhly, bearing beams are installed; eighthly, longitudinal beams are installed; ninthly, the distribution beams are installed; tenthly, bridge deck slabs and guardrails are installed; and 11, an intelligent monitoring and early warning system.

The invention discloses a road and bridge deck disease identification method based on deep learning. The method comprises the following steps: acquiring a road and bridge deck disease image data set; constructing a road and bridge deck disease recognition model, and training the road and bridge deck disease recognition model based on the road and bridge deck disease image data set to obtain a trained road and bridge deck disease recognition model; the road and bridge floor disease identification model is constructed and obtained on the basis of a YOLOv9 network framework in combination with a CARAFE up-sampling module and a Triplet Attention mechanism; and obtaining a to-be-identified road and bridge surface image, and inputting the to-be-identified road and bridge surface image into the trained road and bridge surface disease identification model to obtain a disease identification result of the to-be-identified road and bridge surface image. According to the method provided by the invention, the problem of low recognition precision of an existing algorithm in different application scenes is effectively solved, and multiple disease types in road surface and bridge environments can be effectively and accurately recognized.

The invention relates to an ultrasonic guided wave array detection method and system for orthotropic steel bridge deck cracks, and the method comprises the steps: employing an ultrasonic guided wave generator to apply ultrasonic guided waves propagating in a second direction to a plurality of set areas delimited in a first direction on a steel bridge deck one by one, a signal receiver is adopted to receive a reflection signal of the ultrasonic guided wave; a preset signal analysis model is adopted to carry out intelligent processing on the reflection signals, the intelligent processing comprises signal data preprocessing, first module strength feature analysis based on a dense block convolutional neural network and second module time sequence dependency analysis based on a bidirectional long-short-term memory neural network, and therefore cracks are accurately recognized; in addition, the invention further provides a detection system for executing the method. The crack detection method provided by the invention is simple and convenient to operate, solves the problem that a traditional detection method is difficult to fully cover, and improves the accuracy and efficiency of detection.

The invention relates to the technical field of bridge construction, and provides a construction method of a cable-stayed-continuous cooperative system composite beam bridge, which does not need to arrange a large batch of prestressed corrugated pipes and steel beams to ensure the use performance of a bridge deck slab, fully utilizes the structural characteristics of the cable-stayed-continuous cooperative system composite beam bridge, and improves the construction efficiency of the cable-stayed-continuous cooperative system composite beam bridge. By changing the overlapping sequence of the continuous composite beam bridge deck slabs, it is guaranteed that the bridge deck slabs in the hogging moment area of the continuous composite beam do not generate tensile stress, the bridge deck slabs in the sagging moment area generate pressure stress reserve, and by increasing the tension stay cable force, the continuous composite beam moves upwards close to a side main beam of the cable-stayed bridge and moves downwards close to a side span side main beam; the bridge deck slab generates compressive stress, the steel main beam generates tensile stress, the compressive property of concrete materials and the tensile property of steel are fully played, the material utilization rate is increased, the compressive pre-stress of the bridge deck slab is completed through internal force distribution of the composite beam, the construction method is simple and operable, the structural stress is clear, and the reasonability and safety of the structural stress are guaranteed.

The invention provides an aircraft load bridge monitoring method and monitoring system based on a microwave radar, and the method employs the microwave radar to monitor the dynamic displacement of an aircraft load bridge in real time, employs a video recognition technology to recognize an aircraft passing through the bridge, and carries out the comparison with flight information in an airport data system. The model, the quality and the speed of the airplane passing through the bridge are automatically confirmed; then, endowing an airplane model with the obtained airplane mass and speed, establishing an airplane-bridge coupling vibration model considering the bridge deck irregularity, and obtaining the dynamic displacement of the bridge midspan when the airplane passes through the airplane load bridge through nonlinear numerical calculation; and comparing the actually measured dynamic displacement with the theoretically calculated dynamic displacement, and judging whether the aircraft load bridge has a safety problem or not. According to the invention, automation and intellectualization of aircraft load bridge health monitoring can be realized, the efficiency of aircraft load bridge monitoring and evaluation is greatly improved, the cost is saved, and the accuracy of monitoring and evaluation is improved.

The invention relates to the technical field of data processing systems for supervision or prediction, in particular to a road and bridge deck sudden collapse early warning system and method based on the Internet of Things, and the system comprises a deformation monitoring system which is used for collecting the deformation data of a road and bridge deck; the data processing system is used for processing the deformation data based on the Internet of Things so as to obtain effective data meeting a preset storage condition; and the early warning management center is used for inputting the effective data into a pre-constructed road and bridge surface collapse risk prediction model to obtain a risk assessment result and a trend prediction result of the road and bridge surface so as to carry out early warning on sudden collapse of the road and bridge surface. Therefore, the problems of low data precision, poor credibility, early warning information delay, increased safety risk and the like caused by the fact that an early warning system only depends on a single technology, is easily influenced by environmental factors and cannot comprehensively capture various abnormal signals which may predict collapse in related technologies are solved.

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 FEBD seamless bridge deck connecting plate adopting the T-shaped shear nail structure comprises a semi-continuous UHPC bridge deck connecting plate arranged on the upper side of a telescopic gap at the beam end in a striding mode, and a polyurethane pavement layer used for bearing vehicle loads is laid on the upper side of the semi-continuous UHPC bridge deck connecting plate. T-shaped shear nails are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge floor connecting plate. According to the connecting plate, the seamless bridge floor can be realized, and the diseases such as pavement layer disengagement and hemming caused by large deformation difference when wheels pass through the expansion joint are obviously relieved; and in addition, the complex space stress state of the bridge deck can be better adapted, the normal use requirement of the bridge deck continuous structure is met, the construction period is effectively shortened, and the influence on traffic is small.

The invention discloses an implementation method of an assembled Larsen steel plate trestle, and relates to the technical field of foundation pit platform construction processes. An implementation method of an assembled Larsen steel plate trestle comprises the following steps of pile foundation and trestle vertical frame construction, trestle beam frame construction, trestle deck construction, first-layer trestle vertical frame supporting construction, multiple-layer trestle vertical frame supporting construction, construction and follow-up maintenance. According to the construction method provided by the invention, the assembled Larsen steel plate trestle can be constructed, the assembled Larsen steel plate trestle not only has high bearing capacity, but also is simple and convenient to construct, can be quickly mounted and dismounted on a foundation pit construction site, and has high construction efficiency, in addition, each main structure can be repeatedly used for multiple times, materials are favorably saved, and the construction cost is reduced. The construction cost is reduced.

The invention discloses a construction method for removing an old bridge and newly building bridges without interrupting traffic. The construction method comprises the following steps that a first bridge and a second bridge are newly built on the two sides of an original old bridge correspondingly; two-way traffic on the old bridge is guided to the first bridge firstly, and then the old bridge is dismantled; bridge decks flush with the surface of the second bridge are installed on the two sides of the second bridge, so that bidirectional widening of the second bridge is completed; two-way traffic on the first bridge is guided to the widened second bridge, and the first bridge is closed; bridge decks flush with the surface of the first bridge are installed on the two sides of the first bridge, so that bidirectional widening of the first bridge is completed; and then the traffic flow in one direction is guided to the widened first bridge, and only the one-way traffic flow in the other direction is reserved on the second bridge. According to the method, the transformation mode of double-side bridge building and two-way widening is adopted, the defects of existing single-side widening and double-side widening are overcome, the defects existing after double-width bridges are widened are overcome, and the later maintenance cost is reduced.

The invention discloses a steel bridge deck fatigue crack propagation evaluation method and device, a storage medium and a product. The method comprises the steps that equivalent stress range prediction models of different vehicle types are constructed according to a probability model of actually measured traffic loads; according to the actually measured traffic load probability model and the equivalent stress range prediction model, constructing a steel bridge deck weld fatigue stress spectrum probability model; constructing an equivalent stress strength factor range prediction model of the crack tip and the crack edge; according to the initial crack depth, the form ratio, the probability model of the material related parameters, the stress spectrum probability model and the equivalent stress strength factor range prediction model of the crack tip and the crack edge, performing crack random propagation analysis; and probability evolution analysis of different sensitivity parameters and reliability evaluation of the steel bridge deck are carried out according to the distribution characteristics of the sensitivity parameters in the crack propagation process. According to the invention, the evaluation accuracy is improved, the evaluation time consumption is reduced, and the evaluation efficiency is improved.

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.