1253 results about "Bridge deck" patented technology

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 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 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 discloses a simple layout method for distributed optical fiber deflection monitoring of a continuous beam bridge cluster, and the method comprises the steps: laying upper and lower edge strain sensing optical cables on a boundary beam of the continuous beam bridge cluster, only laying the lower edge strain sensing optical cable on a middle beam, and obtaining the deflection of the boundary beam through the upper and lower edge strain monitoring data of the boundary beam; and reconstructing the upper edge strain data of the middle beam by utilizing the upper edge strain data of the boundary beam, and realizing the accurate reconstruction of the deflection of the middle beam by combining the lower edge strain monitoring data of the middle beam through a continuous beam bridge deflection reconstruction method based on data-physical hybrid driving. The method not only solves the problems of large sensor consumption, complex arrangement, high construction cost, poor cluster monitoring economy and the like caused by simultaneous arrangement of optical fibers on the upper edge and the lower edge of each beam in the prior art, but also solves the problems of difficulty in arrangement of sensors and large construction damage caused by bridge deck pavement coverage on the upper edge of the middle beam; and the robustness and the data reconstruction capability of the monitoring system are effectively improved.

The invention relates to the technical field of bridge engineering detection and life evaluation, and discloses a bridge deck residual fatigue life prediction method and system based on real-time image information. The objective of the invention is to solve the problems of low subjective efficiency, time-consuming numerical simulation, low automation and intelligence level and poor generalization ability of the existing in-service bridge RC deck residual fatigue life evaluation means. According to the scheme, an evaluation system including image acquisition, physical simulation data set generation, deep learning evaluation model and result output is constructed; generating a bridge deck crack image-residual fatigue life pairing data set covering mirror symmetry and extreme crack modes by using a high-fidelity physical simulation platform, and training an end-to-end deep convolutional neural network regression model; a bridge floor image is collected on site and preprocessed, the residual fatigue life is directly output by an input model, and finally a visual evaluation report is generated.

The invention relates to a method and device for determining the arch axis of an arch bridge, electronic equipment and a storage medium, and belongs to the technical field of bridge engineering.The method for determining the arch axis of the arch bridge comprises the steps that the main beam axis of a bridge floor in the arch bridge is determined, and the bridge floor of the arch bridge is located on an asymmetric longitudinal section line; determining two arch feet of the arch bridge on a main beam axis based on a preset calculation span in the arch bridge, and constructing a three-dimensional rectangular coordinate system by taking an intersection point of a horizontal line passing through the first arch foot and a central stake mark line of the arch bridge as an origin of coordinates; in the three-dimensional rectangular coordinate system, the centroid of the arch rib is determined based on the origin of the coordinates and the preset rise, curve fitting is conducted on the two arch feet and the centroid of the arch rib, and a projection curve of the arch axis of the arch bridge on the vertical face of the arch bridge and the coordinates of the position relation between the three-dimensional rectangular coordinate system and the arch rib in the three-dimensional rectangular coordinate system are obtained. According to the method, the arch axis of the through type simply supported basket arch bridge with the bridge deck located on the asymmetric longitudinal section line can be determined.

The invention discloses bridge floor self-moving installation equipment and method for a prefabricated guardrail wall of a subway viaduct. The equipment comprises a base, a supporting displacement mechanism, a vertical supporting rod mechanism, an operation platform, a balance weight mechanism, a hoisting mechanism and a detection assembly. The supporting displacement mechanism comprises a wheel set and an oil cylinder supporting leg which are used for overall displacement and ground supporting respectively. The vertical supporting rod mechanism is fixedly arranged on the top of the base and used for supporting the operation platform. The counterweight machine is arranged on the base, so that the equipment is prevented from overturning; the hoisting mechanism comprises a moving trolley, a longitudinal driving assembly and a winch; the detection assembly detects related installation information; according to the installation equipment, an integrated installation system with a hoisting function is formed through the bridge floor self-moving base, the hoisting mechanism capable of being adjusted in a three-dimensional mode and the matched vertical supporting rod and counterweight system, dependence on large ground hoisting machinery is not needed, and the problems that in traditional hoisting operation, traffic limitation is serious, and efficiency is low are effectively solved; and meanwhile, precise positioning and mounting of the prefabricated guardrail wall are achieved.

The invention discloses a bridge flood damage rapid pass keeping truss device and a construction method.The bridge flood damage rapid pass keeping truss device comprises a truss body, a pilot truss, a deflection adjusting device, a truss pushing device, a truss jacking device, a rolling supporting device, a counter-force device and an anchoring device, and the pilot truss can be detachably installed at the front end of the truss body; the deflection adjusting device is installed at the bottom of the front side of the pilot truss, the truss jacking devices are detachably installed at the front end and the rear end of the truss body respectively, and the rolling supporting device is arranged below the truss body, makes rolling contact with the truss body and is used for supporting the truss body in a rolling mode. The counter-force device is anchored on a roadbed and / or a bridge floor through the anchoring device, the truss pushing device is connected with the counter-force device, and the truss pushing device is supported by the counter-force device and used for pushing the truss body to move forwards on the rolling supporting device. According to the method, the rapid communication keeping construction of the water destroyed bridge can be completed on the basis of not using large hoisting equipment, and the construction cost is low.

The invention relates to the technical field of big data processing bridge health monitoring, in particular to a distributed bridge disease data summarization bridge health monitoring method and system, and the method comprises the steps: obtaining vibration data and steel beam stress data of a bridge at a plurality of positions, and wind speed data near the bridge; obtaining the validity coefficient of each modal component of the vibration data to extract the de-noised vibration data in each time period of the current position, calculating the significant value of the dominant frequency down-shift characteristic of the de-noised vibration data in each time period of the current position, and further obtaining the abnormal coefficient of the bridge floor vibration in each time period of the current position; and obtaining the abnormal coefficient of the bridge deck steel beam stress at the current position in each time period by combining the random fluctuation degree of the de-noised steel beam stress data in each time period, and obtaining the significant value of the bridge load influence by combining the average distribution level of the wind speed data for monitoring the health state of the bridge. The bridge health monitoring precision can be improved.

The invention relates to the technical field of concrete paving, in particular to a steel truss bridge surface ultrahigh toughness concrete automatic dispersing and paving device and a construction method.The device comprises a mounting shell assembly, a concrete dispersing mechanism is mounted at the upper end of the mounting shell assembly, and a paving range regulating and controlling mechanism is arranged in the mounting shell assembly; the paving range regulating and controlling mechanism is arranged at the lower end of the concrete dispersing mechanism; the method comprises the following steps of traction installation, concrete dispersion, preliminary adjustment of output width, preliminary adjustment of paving thickness, high-frequency vibration and power output. According to the device, full dispersion operation can be carried out on ultrahigh-toughness concrete, dispersion uniformity is guaranteed, targeted adjustment can be carried out according to the paving width and thickness, and plane vibration leveling operation is carried out on the surface of the ultrahigh-toughness concrete after paving is completed; the dispersion uniformity and the paving quality of the ultrahigh-toughness concrete are further ensured.

The present invention relates to the technical field of bridge engineering. Particularly disclosed are a steel shell-concrete composite orthotropic bridge deck structure and a fabrication method and device. The steel housing-concrete composite orthotropic bridge deck structure comprises a steel shell structure, infilled concrete, longitudinal and transverse stiffening ribs arranged at the bottom of the steel shell structure, and a deck-end connecting structure, wherein the steel shell structure comprises an upper steel plate and a lower steel plate that are arranged in parallel, and a plurality of perforated T-shaped ribs arranged in parallel in a longitudinal direction. Webs of the perforated T-shaped ribs are welded to the upper steel plate, flanges are riveted to the lower steel plate, the upper steel plate and the lower steel plate are connected into the steel shell structure, and reinforced concrete tenons formed by the perforated T-shaped ribs and core bar reinforcements and shear bolts anchor the upper steel plate and the lower steel plate in the infilled concrete to form a steel shell-concrete composite deck that bears loads jointly. The present invention provides high bending stiffness, solves the problem of fatigue at welds between the stiffening ribs and a steel top plate, fully utilizes the properties of a steel shell and concrete, and solves the problems of the crackability under a negative bending moment and excessive weight of a traditional composite bridge deck.

The utility model discloses a local variable stiffness enhanced welding stud shear connector and a steel-concrete combined track beam. The connector comprises a thickened bottom rod, a slender middle rod and a cylindrical head which are connected in sequence, the diameter of the thickened bottom rod is greater than that of the slender middle rod; the cylindrical head is larger in diameter than the elongated middle rod. The steel-concrete combined track beam comprises a UHPC cast-in-place bridge deck slab, a local variable stiffness enhanced welding stud shear connector and a track steel beam, and the local variable stiffness enhanced welding stud shear connecting piece is welded on the top surface of the track steel beam and is used for connecting the track steel beam with the UHPC cast-in-place bridge deck at the upper part. The connecting piece has the advantages of being suitable for the steel-concrete combined track beam and aiming at solving the problems that a traditional shearing force connecting piece is insufficient in shearing bearing capacity under the complex dynamic load environment, a concrete panel is prone to cracking and the like, and therefore the overall bearing capacity, durability and anti-cracking performance of the track beam are improved, and the quality and efficiency of the cast-in-place construction technology are optimized.

The invention relates to a bridge deck pavement layer recessive disease nondestructive testing method and system. The method comprises the following steps: determining an interfered coefficient of a corresponding frame of infrared image according to a light change coefficient at each moment, a vehicle speed at a corresponding moment and a distribution dispersion of edge lines in the corresponding frame of infrared image; according to the interference coefficient in each constant-speed time period and the vehicle speed in the constant-speed time period, determining an inclusion coefficient of each constant-speed time period; determining a strain coefficient of each speed change time period according to the plurality of light change coefficients, the vehicle speed variation and the duration of the speed change time period in each speed change time period, and determining a light interference coefficient of the target moment according to the plurality of containing coefficients and the plurality of strain coefficients; and determining the vehicle speed of the next moment based on the light interference coefficient of the target moment, the average speed of the vehicle in the driving process and the driven distance of the vehicle. According to the method, the influence of ambient light fluctuation on the infrared image acquisition precision can be effectively inhibited, and the detection accuracy and reliability of the bridge deck pavement layer recessive diseases are enhanced.

The invention provides a bridge floor slag blocking wall stability analysis system and method for a high-speed railway, and relates to the technical field of high-speed railway engineering. The system comprises a data acquisition and processing unit, a structure analysis and calculation unit and a stability evaluation and early warning unit. The data acquisition and processing unit is used for acquiring geometric parameters of the slag wall, material performance parameters and original data and historical data of environmental load; the structural analysis and calculation unit is used for simulating dynamic stress and displacement response of the slag wall under multiple working conditions in the whole life cycle based on the original data and the historical data; and the stability evaluation and early warning unit is used for carrying out self-adaptive intelligent judgment on the stable state of the slag blocking wall based on the dynamic stress and the displacement response, carrying out graded early warning on potential risks and predicting the evolution trend of the potential risks. The method and the device are used in the stability analysis process of the bridge floor slag blocking wall, and solve the technical problem of lagging risk early warning of the stability analysis of the bridge floor slag blocking wall of the high-speed railway in the prior art.

The invention discloses an intelligent prediction method for welding deformation of a steel bridge deck based on physical-virtual double-domain collaboration and CNN-LSTM fusion modeling, relates to the technical field of welding process optimization and intelligent manufacturing, and aims to solve the problem that traditional welding deformation control mainly depends on empirical formula derivation and finite element thermoelastic-plastic analysis. However, the former is difficult to accurately reflect a nonlinear relation of a complex welding condition, and the latter has the problems of high computing resource consumption, low modeling efficiency and the like, and particularly, the prediction precision and the real-time performance are difficult to meet intelligent manufacturing requirements in the face of a multi-welding-seam coupling effect and a large-scale structure. The invention provides an intelligent prediction method for welding deformation of a steel bridge deck based on physical-virtual double-domain cooperation and CNN-LSTM fusion modeling, and the method comprises the steps: deeply fusing the dynamic mapping capability of the physical-virtual double-domain cooperation and the spatial-temporal feature modeling advantages of a CNN-LSTM fusion model, and synchronously integrating an NSGA-II algorithm to construct a process optimization closed-loop system; and high-precision prediction and process dynamic optimization of the welding deformation of the steel bridge deck are realized.

The utility model discloses an extension type hoisting frame body based on bridge deck slab installation construction, which comprises an extension frame body structure which is fixedly connected and assembled on a hoisting tool base in a transmission manner to form a positioning extension type hoisting platform; the inhaul cable limiting structure comprises a lifting hook body and a limiting sleeve, a plurality of groups of lifting hook bodies and limiting sleeves are arranged, and the plurality of groups of lifting hook bodies are fixedly connected to the positioning extension type lifting platform in a distributed manner so as to lift an inhaul cable; the multiple sets of limiting sleeves are fixedly connected to the positioning extension type hoisting platform in a distributed mode and located on the side portions of the peripheries of the multiple sets of lifting hook bodies in a one-to-one correspondence mode so as to form a linear limiting function corresponding to the inhaul cables. The technical problem that in the prior art, when bridge deck slabs are hoisted and installed, the position adjusting accuracy is not high is solved.

A cantilever cast-in-place flower pond bailey beam construction trolley comprises a bailey beam base and a plurality of sets of bailey beam cross beams arranged on the top of a cantilever bailey beam, the bailey beam base and the cantilever bailey beam are further fixedly connected through a horizontal support, and a support is arranged on the cantilever bailey beam; the Bailey beam base, the embedded steel bar, the round steel rolling rod and the counter weight form a trolley base, the embedded steel bar is embedded in a bridge deck pavement and is fixedly connected with the Bailey beam base, the round steel rolling rod is laid on the lower portion of the Bailey beam base, and the counter weight is arranged on the lower portion of the Bailey beam base. The cantilever cast-in-place bailey beam construction trolley can overcome the defects that the requirement for a foundation is high, safety risks are large, material investment is large, and embedded parts cannot be repeatedly used, is high in strength, good in structural stability, capable of achieving full protection in the operation process and small in potential safety hazard, does not need beam body embedding, reduces personnel investment, accelerates the construction progress, and improves the construction efficiency. And the construction benefit is improved.

The application relates to the technical field of bridge deck runoff intelligent monitoring, and discloses a highway bridge deck runoff intelligent monitoring and shunting method, which acquires multidimensional data at a bridge deck runoff collection point, transmits the collected multidimensional data to a central controller in real time, inputs the data into an improved RF-XGBoost fusion model after preprocessing, outputs prediction probabilities of three different hazard levels, outputs the hazard level corresponding to the highest prediction probability, and performs intelligent shunting and emergency linkage based on the output hazard level. The method uses a multi-parameter water quality sensor, a high-definition camera, a hydrological and meteorological sensor and an ultrasonic flowmeter, all of which meet the performance standards of industrial-grade monitoring equipment. Through temperature compensation of the sensor, anti-clogging design and optimization of the data transmission protocol, the water quality parameter measurement error can be less than or equal to 5% in theory, the image anomaly recognition accuracy can be greater than or equal to 95%, and the data transmission success rate can be greater than or equal to 99.8%, so that the demand for high-precision collection of bridge deck runoff multi-source data is met.

The present application relates to bridge detection technical field, especially in the bridge dynamic characteristic detection robot straddling crash barrier and detection method. The bridge detection robot includes a mobile device and a detection device; The mobile device is used for walking along the bridge side crash barrier robot; The detection device is installed on the mobile device, and is used for detecting the measured bridge to obtain the bridge dynamic characteristic. The bridge detection robot can ride on the bridge crash barrier and detect the work, and has no any influence on the bridge traffic, and the structural health detection system does not need to be installed on the bridge, so that the bridge dynamic characteristic can be identified. The second purpose of the present application is to provide a kind of bridge detection method, by which, bridge detection robot can travel or stop on bridge crash barrier and carry out vibration signal acquisition, so as to identify bridge dynamic characteristic parameter. The present application can replace the traditional bridge dynamic load test, and the dynamic characteristic of road network bridge group can be quickly detected without affecting traffic.

To provide a method for removing an existing hollow floor slab supported from below by a substructure, which can safely remove the existing hollow floor slab without restricting the space below the existing hollow floor slab and can improve workability. [Solution] The method for removing an existing hollow deck according to the embodiment is a method for removing an existing hollow deck 1 supported by a pier 8, and includes an installation process for attaching anchor brackets 21, 21 to the underside of each of the existing hollow deck 1's piers 8, 8 between a pair of piers 8, 8, attaching an external cable 3 to the anchor brackets 21, 21, and tensioning the external cable 3; a cutting process for cutting the existing hollow deck 1 in the bridge axis direction X after tensioning the external cable 3 to form a first block 71 having the external cable 3; and a removal process for removing the first block 71 using lifting devices 83, 84.

The invention discloses a new and old beam UHPC transverse connection bridge floor structure and a calculation method and construction method thereof.The new and old beam UHPC transverse connection bridge floor structure comprises an old main beam, a new main beam, an old bridge floor concrete pavement layer, a new main beam bridge floor concrete pavement layer, a UHPC connecting plate, a stainless steel plate and a debonding layer structure, the new main beam is arranged on the side edge of the old main beam in parallel, and a set distance is reserved between the new main beam and the old main beam; the old bridge deck concrete pavement layer and the new main beam bridge deck concrete pavement layer are respectively paved at the tops of the old main beam and the new main beam, and a reserved connecting groove is formed at the transverse butt joint of the old main beam and the new main beam; the two ends of the stainless steel plate are arranged at the tops of the new main beam and the old main beam correspondingly, and the UHPC connecting plate is poured into the reserved connecting groove. And debonding layer structures are arranged between the UHPC connecting plates and the new and old main beams, the outer side bottoms of the debonding layer structures are arranged at the tops of the stainless steel plates, and the inner side bottoms of the debonding layer structures are supported at the tops of the new and old main beams. By additionally arranging the debonding layer, the transverse calculation length of the UHPC connecting plate is prolonged, reasonable weakening of the transverse connecting rigidity is achieved, and the transverse rigidity is dynamically adjusted by adjusting the plate thickness and length of the UHPC connecting plate.

The utility model belongs to the field of arch bridges, and discloses a tied-arch bridge which comprises a main span beam, side span beams and arch ribs. The main span beams extend in the bridge direction and bear vehicle loads and the weight of a bridge deck system. The side span beams are connected to the two ends of the main span beam in the bridge direction and can guide transmission of bridge deck loads, release the bending moment of the main span beam and reduce the rotating angle of the main span beam. The arch rib comprises a main arch rib and an auxiliary arch rib, the main arch rib is bent upwards, arch feet at the two ends of the main arch rib are connected to the two bridge-direction ends of the main span beam respectively, the arch foot at one end of the auxiliary arch rib is connected to the bridge-direction end of the side span beam, the arch foot at the other end of the auxiliary arch rib is connected to the main arch rib, and the main arch rib, the auxiliary arch rib and the side span beam define a triangular structure. By means of the geometric stability principle of a triangle, the corner displacement of the bridge end of the tied-arch bridge is effectively restrained, and the smoothness and comfort of driving on the bridge are improved. The structure can also reduce the destructive effect of the bending moment on the side span beam on the main span beam, and the overall durability and safety of the bridge are further enhanced.

The invention belongs to the technical field of sail-shaped cable-stayed bridge construction, and relates to a long and thin structure arched steel tower installation method which comprises the steps that a bridge lower structure and a main tower are constructed, and an auxiliary tower root embedded section, a top connecting piece and related construction components are embedded in the main tower; during main tower construction, an attached tower fixing section and a main beam are synchronously installed, and the attached tower fixing section is fixedly connected with the main tower through welding and a steel truss set; a support is erected on a girder bridge floor, tower-attached sections are assembled according to the inverted arch posture, the pre-bias value and the pre-camber are preset, and rotating hinges are installed; a vertical rotating cable, a back cable and a cable wind cable which are made of steel strands are arranged, and testing is completed; one-time vertical rotation welding of one section of the attached tower is achieved through synchronous traction of a continuous jack, and then secondary vertical rotation is conducted on the whole section of the attached tower; after vertically rotating in place, welding and fixing, and dismounting related equipment and a bracket; the invention aims to solve the problems of high overhead operation risk, difficulty in control of construction precision, large temporary support investment, low work efficiency and insufficient adaptability of a traditional mounting method.

The utility model discloses a light pushable high-speed railway bridge protective wall vibrating operation platform which is characterized in that two handrails are oppositely arranged in parallel, handrail stand columns are fixedly welded to the two sides and the middle bottom ends of the two handrails, and a working platform is fixedly welded to the inner side edge ends of the handrail stand columns; the light vibrating operation platform is composed of the handrails, the handrail stand columns, the working platform, the platform supporting rods, the step supporting rods and the pulleys with the brakes, the whole light vibrating operation platform is made of high-strength light aluminum alloy rectangular square tubes, a main body is of a rectangular structure, and on the premise that stability is guaranteed, the vibrating efficiency of a high-speed rail bridge deck protection wall can be effectively improved; the operation that a worker stands on the protective wall to vibrate concrete is eradicated, the operator is prevented from accidentally falling, the problems that the pouring and vibrating operation efficiency of the high-speed rail bridge protective wall is low, and vibrating construction operation is inconvenient and unsafe are solved, and the field safe and civilized construction level is also improved while the vibrating efficiency is improved.

This invention provides a microbridge structure and its fabrication method, as well as an uncooled infrared microbolometer, belonging to the fields of microelectromechanical systems (MEMS) and infrared detection technology. The microbridge structure includes two diagonally arranged anchor posts, two supporting legs, a bridge deck, and an umbrella-shaped canopy. Each supporting leg consists of multiple alternating longitudinal segments and multiple transverse segments connected end-to-end. The longitudinal segments extend at an angle greater than 45 degrees relative to the horizontal plane, while the transverse segments extend parallel to the horizontal plane. One end of each supporting leg is connected to an anchor post, and the other end is connected to the end of the bridge deck, suspending the bridge deck. This design maintains the slender characteristics of the supporting legs to ensure low thermal conductivity and high thermal insulation performance, while significantly reducing the residual stress on the supporting legs by utilizing the high cross-sectional moment of inertia of the longitudinal segments. This improves the mechanical stability and deformation resistance of the microbridge structure, solving the problem of balancing stability and thermal performance in traditional horizontal supporting leg structures. This invention also provides a corresponding fabrication method.

The application relates to a bridge collapse identification method and system based on vehicle mobile terminal sensing data, and belongs to the technical field of bridge safety monitoring. The method comprises the following steps: in the case that a target vehicle is determined to be located on a bridge section based on relative positions, monitoring driving acceleration of the target vehicle according to IMU data of a vehicle mobile terminal; in the case that a mutation occurs in vertical acceleration in the driving acceleration of the target vehicle, judging whether the target vehicle appears a bridge falling state caused by bridge collapse based on the vertical acceleration and synthetic lateral acceleration; if the target vehicle appears the bridge falling state caused by bridge collapse, obtaining jerk of the vertical acceleration, and determining bridge falling time information of the target vehicle based on the jerk; and based on the bridge falling time information of the target vehicle and falling heights of multiple vehicles when falling off the bridge, adjusting the credibility of the bridge collapse based on the falling heights of the multiple vehicles when falling off the bridge, so as to improve the determination accuracy and credibility of the bridge collapse state.

The utility model provides a steel-concrete composite beam cast-in-place bridge deck slab supporting structure which comprises a plurality of steel plate beams with the two ends supported on bridge piers, a plurality of pairs of hanging rings are arranged between the adjacent steel plate beams, two hanging rings in one pair of hanging rings are prefabricated on the edges of the two steel plate beams respectively, and the hanging rings extend in the extending direction of the steel plate beams. The lifting rings at the same end are arranged at the two ends of the middle main beam in a sleeving mode, a plurality of middle transverse distribution beams are laid on the main beam, the steel plate beam comprises a top plate, a bottom plate and a vertical plate connecting the bottom plate and the top plate together, and middle supporting pads are laid on the middle transverse distribution beams. The steel plate beam and the middle supporting pad form a bridge deck slab bottom formwork. The utility model has the advantage that the construction of the cast-in-place bridge deck of the steel-concrete composite beam can be completed without erecting a support frame on site, and solves the problem that the existing cast-in-place bridge deck of the steel-concrete composite beam needs to erect a support structure supported on the ground on site for construction.

The utility model discloses a template-free central anti-collision guardrail structure prefabricated by pouring concrete in the middle. The template-free central anti-collision guardrail structure comprises a beam body, a prefabricated body, a steel reinforcement framework and a middle core body, a first reinforcing steel bar is pre-buried in the beam body; the prefabricated body is made of concrete, the prefabricated body abuts against a beam body, the prefabricated body comprises a base shell and a guardrail body, and a hollowed-out space with a downward opening is formed in the middle of the base shell; the prefabricated body is arranged, the hollowed-out space is formed in the middle of the base shell, after the prefabricated body is hoisted, the steel reinforcement framework can be connected with the first steel reinforcement in a coupling mode, factory prefabrication and on-site rapid hoisting can be achieved, the bridge deck pavement construction procedure is not affected, concrete is secondarily poured into the hollowed-out space through the pouring hole, and the middle core body is formed; and a template is not needed in the construction process, so that the construction progress is greatly accelerated, the efficiency is greatly improved, the pouring quality can be guaranteed, noise and dust residue pollution generated in the construction process can be reduced, and the method is environmentally friendly and can be widely popularized and used.

The invention relates to an integrated dismantling method and system for an arched beam of a tied-arch bridge and a storage medium, and the method comprises the following steps: arranging a temporary supporting structure under the tied-arch bridge, and carrying out consolidation treatment on a support of the tied-arch bridge; demolition operation is carried out on the bridge deck system structure of the arch bridge in sequence; an arched girder and a stiffening girder of the main bridge are divided into a plurality of large sections in the longitudinal bridge direction, and the large sections are sequentially subjected to arched girder integrated dismantling operation; and dismantling the residual components of the arch bridge so as to complete dismantling of the arched beam of the tied-arch bridge.

According to the prefabricated pavement slab mounting structure and the construction method, the prefabricated pavement slab mounting structure comprises a leveling bonding layer laid on a foundation pavement and a prefabricated pavement slab arranged on the leveling bonding layer, a leveling hole of the prefabricated pavement slab is matched with an adjusting mechanism used for adjusting the elevation and gradient of the prefabricated pavement slab, and slurry before the leveling bonding layer is solidified is filled into a reserved hole; the slurry supplementing liquid flows into the leveling bonding layer through the reserved hole and is solidified with the unsolidified slurry of the leveling bonding layer to form an integrated structure. According to the prefabricated pavement slab mounting structure, the elevation and gradient of the prefabricated pavement slab are adjusted through the adjusting mechanism, the slurry supplementing liquid and the sheet adjusting bonding layer are solidified into an integrated structure, the interlayer bonding force is good, the bearing capacity is high, splicing type and full-width rapid on-site assembly thickening construction of the prefabricated pavement slab can be achieved on different types of foundation pavements, and the construction efficiency is improved. When the device is applied to airfield pavement slab repair, non-stop fast delivery is achieved, and when the device is applied to a steel bridge deck, the requirements of multi-dimensional deformation and stress release of a bridge, especially an extra-large flexible steel bridge under the action of external force are met.