3449 results about "Box girder" patented technology

The invention discloses a bridge disease detection method and system based on an improved multi-mode visual language model, and the method comprises the steps: obtaining a historical bridge original image which comprises a bridge cantilever casting section, a cast-in-place section, a web, a diaphragm plate, a closure section and a concrete box girder; constructing an improved multi-modal visual language target detection model; based on the bridge original image, training the improved multi-modal visual language target detection model to obtain a trained improved multi-modal visual language target detection model as a bridge disease detection model; obtaining a to-be-detected bridge image, and dividing the to-be-detected bridge image into a plurality of overlapped image blocks based on an SAHI sliding window mechanism; detecting each image block in a local region based on the bridge disease detection model to obtain a region detection result; and on the basis of the detection result of each region, generating a global detection result in a splicing and fusion mode.

The invention relates to the technical field of stress detection, in particular to an absolute stress detection method and system for a concrete bridge, and the method comprises the following steps: obtaining stress data of a bridge girder, a support, a box girder and a main tower, collecting wind speed and wind direction sensor data, calculating a wind load gradient value, and extracting wind load primary and secondary influence regions and a transmission buffer region. And generating a wind load area stress data set. According to the method, through environmental factors and stress data, the influence of wind load on structure stress is identified, data comprehensiveness is ensured, through wind load gradient change rate calculation and stress sudden change area extraction, the structure weak point identification capability is improved, the stress fluctuation trend is quantified through time sequence analysis, and the cumulative change rate is deduced, so that fatigue damage prediction is more accurate; abnormal point identification is combined with deviation ratio analysis, measurement data is corrected, analysis reliability is improved, fatigue damage information is extracted based on stress attenuation features, local fatigue evaluation is optimized, a damaged area is accurately locked, and the accuracy of structural health monitoring is improved.

A method for testing and evaluating lateral stiffness of small box girder bridges is provided. The method includes the following steps: a deflection sensor collects a deflection value of a measuring point based on a loading process of a loading vehicle; based on the deflection value of the measuring point and an information matrix of the loading vehicle, an influence line of longitudinal bridge deflection of each measuring point is obtained; based on the influence line of longitudinal bridge deflection, the influence line of lateral bridge deflection of small box girder bridge is obtained by interpolation method; and based on the influence line of lateral deflection of small box girder bridge, a stiffness evaluation result is obtained.

The invention relates to the technical field of bridge construction, in particular to an intelligent cleaning device and method for a box girder side formwork. The device comprises a mobile platform, a control device, a mechanical arm assembly, a cleaning device, an infrared induction sensor, a dust collection device, a multispectral visual recognition module, a 3D environment modeling module, a path planning module, a cleaning quality detection module and a self-adaptive learning database. The multispectral visual recognition module recognizes the stain type and the adhesion strength. The 3D environment modeling module is used for constructing a three-dimensional point cloud model of a working area in real time; the path planning module generates an optimal cleaning path based on a reinforcement learning algorithm; the cleaning quality detection module detects residual stains and triggers secondary cleaning; the adaptive learning database stores historical cleaning data and optimizes a cleaning strategy through a machine learning model. The full-process automatic cleaning operation of the box girder side form can be achieved, and the comprehensive functions of dirt recognition, autonomous path planning, efficient cleaning, real-time detection and the like are achieved.

Provided in the present invention are an integrated intelligent construction method for a cast-in-place box girder, and a system. The method comprises the following steps: S1, designing a scheme on the basis of BIM; S2, forming and transporting a rebar part; S3, establishing a box girder formwork; S4, testing the precision of the formwork; S5, assembling the rebar part in the formwork; S6, testing the quality of the rebar part; S7, constructing a prestressed pipeline and performing alignment inspection; S7, casting concrete; S8, testing the quality of the concrete; S9, curing the concrete; S10, controlling the quality of curing; and S12, performing prestressed tensioning and grouting inspection. Intelligent integrated box girder construction is realized by means of the above steps. In the present invention, the above solution is used, and intelligent control technology is introduced into a construction method, so that the mechanization, automation and intelligence levels of cast-in-place box girder construction can be improved, thereby greatly improving the construction efficiency, reducing labor intensity, improving on-site management levels, and ensuring construction safety and construction quality.

The invention discloses a railway box girder full-section data monitoring method and system based on a three-dimensional scanner, and particularly relates to the technical field of data monitoring, and the method comprises the steps: collecting the data of the full section of a railway box girder through the three-dimensional scanner, scanning each part of the box girder for multiple times, and determining the data collection process of the full section of the railway box girder. Collected railway box girder full-section data are processed, point cloud data are spliced through an aerial triangulation calculation process based on dense point cloud data, key point circle center position accurate estimation and key plane fitting and optimization, and an operator uploads the spliced data and special mark point coordinates to an intelligent measurement integrated platform system. The point cloud information and the contour information of the prefabricated box girder are collected, the acceptance assessment model of the prefabricated box girder is constructed, the possible significant deviation between the box girder model and the design standard is quantified, and the railway box girder full-section acceptance efficiency can be improved.

The invention belongs to the technical field of prefabricated box girder crack detection, and particularly relates to a prefabricated box girder crack dynamic detection system and a prefabricated box girder crack dynamic detection method. The crack initiation position is efficiently identified from a single-source spectral image by utilizing spectral reflectivity difference, so that the crack detection efficiency is remarkably improved, and meanwhile, crack information and stress data are subjected to correlation analysis to determine a critical stress distribution state causing crack initiation, so that effective prediction of potential cracks is realized, and the accuracy of crack detection is improved. And meanwhile, after the crack is initiated, the crack propagation speed and the crack propagation direction are continuously monitored, so that the real-time tracking of the crack dynamic evolution process is realized, and targeted crack propagation response measures are taken by utilizing the risk orientation obtained by performing risk assessment in combination with a crack propagation monitoring result, so that the further propagation of the crack can be effectively prevented.

The present disclosure provides a molding machine for flexible production of a rebar of bottom, web, and top plates of a precast small box girder, comprising a molding mainframe and a movable gantry welder disposed on an outlet end of the molding mainframe. The molding mainframe includes a frame, two synchronous lifters, a vertical movable sliding table, a plurality of upper support plates, and a plurality of comb-like support plates. A plurality of spot welding assemblies are disposed on an upper side and a lower side of an outlet end of the frame, a straightening rebar receiving assembly is mounted on the lower side and two bending assemblies are mounted on a left side and a right side of the outlet end of the frame, and a straightening rebar feeding assembly is disposed between the straightening rebar receiving assembly and the frame.

The invention provides a portable stirrup welding device for high pier construction, and relates to the technical field of box girder stirrup welding equipment.The portable stirrup welding device comprises a welding hand-held piece, and a steel bar storage part is installed on the welding hand-held piece; the steel bar storage part is used for storing stirrup connecting bars; a connecting rib pushing piece is mounted on the welding handheld piece; the connecting rib pushing piece is used for pushing stirrup connecting ribs; two stirrup prestress pieces are mounted on the welding handheld piece; the two stirrup prestressed parts are used for pulling stirrups; prestress annealing welding can be achieved, the welding tension degree is poor, meanwhile, the accuracy of welding seams can be affected by deviation of the stirrups, and the problems that the welding efficiency is low, the stirrups are not convenient to automatically correct and the tension degree of the welded stirrups is poor due to the fact that welding work of the stirrups for high pier construction mostly adopts manual handheld welding gun operation are solved.

The invention relates to the technical field of prefabricated box girders, and particularly discloses a prefabricated box girder vibrating device which comprises an electric sliding rail, a hanging plate and a mounting plate, the mounting plate is arranged at the bottom of the hanging plate, multiple sets of vibrating assemblies are arranged on the mounting plate, the hanging plate is vertically arranged on the electric sliding rail, and a transmission assembly is arranged between the hanging plate and the electric sliding rail; the hanging plate can be driven by the electric sliding rail to move, so that the transmission assembly drives the mounting plate to slide in the length direction of the hanging plate. The vibrating assembly comprises a plurality of vibrators, vibrating hoses and vibrating rods, the vibrators are fixed on the mounting plate at equal intervals, and the vibrating hoses are arranged at the output ends of the vibrators; according to the precast box girder vibrating device, the vibrating rod advances along the S-shaped route, so that two adjacent drop points of the vibrating rod are staggered and cannot be kept on the same straight line, the vibrating coverage area of the vibrating rod is increased, the vibrating dead angle is reduced, and concrete is more comprehensively and fully vibrated.

The invention relates to the technical field of bridge engineering, and discloses a concrete box girder prefabricated segmental girder formwork system and a construction method thereof.The concrete box girder prefabricated segmental girder formwork system comprises a connecting beam frame and fences, the fences are fixedly connected to the upper surface of the connecting beam frame, and an end formwork is detachably installed on the front surface of the connecting beam frame; a side formwork is fixedly connected to the lower portion of the front surface of the connecting beam frame, a side formwork is detachably installed on the upper surface of the side formwork, and an auxiliary formwork is detachably installed on the lower portion of the side formwork. Through the arrangement of the end formworks, the side formworks, the auxiliary formworks, the movable bottom formworks, the walking sliding shoes, the jacks, the reinforcement cages and the side formwork frames, a short line matching method is adopted for prefabrication, a formwork system is matched, reasonable hydraulic jack arrangement is adopted, precise formwork adjustment, supporting and demolding are achieved, the segmental beam prefabrication precision is improved, the bridge splicing quality is guaranteed, the construction process is optimized, and the construction efficiency is improved. All procedures are closely connected, construction time is shortened, and construction efficiency is improved.

The invention discloses a multi-sensor fusion-based suspended casting box girder hanging basket state monitoring method and system, and relates to the technical field of intelligent monitoring of engineering equipment. The method comprises the following steps: collecting deformation monitoring data and environment data of a hanging basket system in an operation process; constructing a hanging basket system deformation quantity prediction model taking the deformation monitoring data and the environment data as input; training the prediction model by using historical monitoring data, and minimizing a prediction error by adjusting model parameters; and outputting a hanging basket system deformation quantity prediction result by using the trained prediction model, and effectively improving the precision and reliability of deformation quantity prediction by combining a convolutional neural network and a long-short-term memory network, thereby providing powerful support for safety monitoring and quality control of bridge construction.

The invention discloses a multi-station device for producing and welding box girder prestress positioning meshes, which relates to the technical field of reinforcing mesh production and comprises a straightening machine, a feeding conveying mechanism, a long rib conveying mechanism, a short rib conveying mechanism, an assembling conveying mechanism, a bending mechanism, an assembling carrying mechanism, a welding mechanism and a discharging mechanism. Steel bar raw materials are straightened and cut through the straightener, a feeding outlet of the straightener is connected with a feeding inlet of the feeding conveying mechanism, and long bars and short bars which are straightened and cut are conveyed to the feeding conveying mechanism to be correspondingly conveyed to the long bar conveying mechanism and the short bar conveying mechanism. The conveyed long ribs are conveyed to the bending mechanism to be bent or not to be bent, then the long ribs and the short ribs sequentially pass through the assembling and conveying mechanism, the assembling and carrying mechanism and the welding mechanism to be assembled and welded, and finally the discharging action is achieved through the discharging mechanism. According to the device, full-automatic small box girder welding production is achieved, and the production efficiency is improved.

The invention discloses a concrete box girder defect automatic detection method and system based on deep learning, and the method comprises the steps: obtaining a visible light image, a laser point cloud and an acoustic emission signal of a box girder, carrying out the data fusion operation, generating new box girder data, setting a defect detection model, and according to the new box girder data, carrying out the automatic detection of the defect of the concrete box girder. Identifying cracks and damages on the box girder; setting a risk assessment model, and calculating a risk index of the box girder according to the new box girder data and cracks and damages on the box girder; and setting a plurality of preset risk grading thresholds, and performing defect risk grading on the box girder in combination with the risk index so as to complete defect detection.

The invention discloses a vibration noise analysis method for a combined box girder bridge with an axle coupling effect, and belongs to the technical field of bridge engineering. The method comprises the following steps: S1, establishing a train-track-bridge coupled vibration model of a high-speed railway steel-concrete combined box girder bridge, and compiling a train-track-bridge coupled vibration simulation analysis program based on a Matlab language and Ansys finite element software; s2, establishing a low-frequency noise prediction model in the steel-concrete combined box girder bridge of the high-speed railway, and obtaining a low-frequency noise radiation rule of a bridge structure; s3, establishing a medium-high noise prediction model of the steel-concrete combined box girder bridge of the high-speed railway, and performing numerical simulation on medium-high frequency radiation noise of a bridge structure; and S4, analyzing the influence parameters of the vibration noise of the steel-concrete combined box girder bridge of the high-speed railway in combination with the models established in the steps S1 to S3. The technical scheme is used for analyzing vibration and noise conditions of the steel-concrete composite beam applied to the field of railroad bridges.

The invention relates to a high-speed railway box girder longitudinal bar distribution method, which comprises the following steps of S1, setting a longitudinal bar datum line at a preset position of a box girder template through a high-precision laser measurement tool and a digital positioning system, and ensuring that the initial position of a longitudinal bar is accurately butted with a design drawing, so that the distribution error is reduced to the greatest extent; through a high-precision laser measuring tool, a digital positioning system and laser scanning equipment, it is ensured that the arrangement precision of longitudinal bars reaches the millimeter level, the distribution error is reduced to the maximum extent, the construction quality is ensured, manual intervention is reduced through an automatic steel bar bracket mounting device and an automatic binding device of a multi-axis mechanical arm structure, and the construction efficiency is improved. The construction efficiency is improved, it is ensured that the installation precision of the steel bars is highly consistent with the design requirement, in addition, a real-time monitoring system is arranged in the whole material distribution process and comprises a sensor, a visual recognition system and a holographic projection technology, and deviation can be detected and corrected in real time in the longitudinal bar arrangement process.

The invention relates to the technical field of box girder reinforcement framework machining, in particular to a bottom web stirrup integrated machining single-machine-head bending device and a forming method of the bottom web stirrup integrated machining single-machine-head bending device. The bending device comprises a straightening mechanism, a feeding and bending mechanism, a transferring mechanism, a welding device and a discharging mechanism. The straightening mechanism comprises a steel bar straightening machine; the feeding and bending mechanism comprises a bending platform, a bending head is arranged in the center of the bending platform, and a steel bar traction device is arranged between the bending head and the straightening mechanism. A reinforcing steel bar cutting device is further arranged between the bending head and the reinforcing steel bar traction device; a regular pushing device is arranged on one side of the bending platform; the transfer mechanism comprises a transfer gripper; the welding device is used for welding the stirrup meshes into an integrated structure; and the discharging mechanism comprises a discharging gripper. According to the bending device, all construction processes for producing the stirrup meshes are smoothly joined, the stirrup mesh bending operation is more efficient, the operation intensity of constructors can be reduced, and the production efficiency of the bottom web stirrup meshes is improved.

The present application relates to the technical field of bridge construction, and in particular to a railway box girder drop system, including a longitudinal deviation correction mechanism, a transverse deviation correction mechanism, and a beam drop mechanism; a plurality of longitudinal deviation correction mechanisms are symmetrically distributed along the longitudinal direction of the bridge between the piers of the box girder to be dropped; a plurality of transverse deviation correction mechanisms are symmetrically distributed along the transverse direction of the bridge between the piers of the box girder to be dropped; the longitudinal deviation correction mechanism includes a first temporary pier, a first slide, a first slide shoe, and a plurality of first jacking devices arranged in sequence from bottom to top, the first slide is fixedly connected to the first temporary pier, and a plurality of first jacking devices are fixed along the transverse direction of the bridge and symmetrically distributed on the first slide shoe; the transverse deviation correction mechanism includes a second temporary pier, a second slide, a second slide shoe, and a plurality of second jacking devices arranged in sequence from bottom to top, the second slide is fixedly connected to the second temporary pier, and a plurality of second jacking devices are fixed along the longitudinal direction of the bridge and symmetrically distributed on the second slide shoe. Through the above arrangement, the accuracy of the box girder drop position can be improved.

The present invention provides a piece-by-piece assembled variable-section box girder structure and a construction method. Each box girder segment box girder includes a top plate unit, two web plate units and a bottom plate unit. A plurality of web vertical ribs are embedded in the web plate unit. A threaded sleeve is connected to each web vertical rib at both ends. Vertical rib holes are provided in the top plate unit and the bottom plate unit. Vertical ribs are inserted into the top plate and bottom plate vertical rib holes and are respectively screwed to the threaded sleeves at both ends of the web vertical ribs. When the box girder is hoisted for construction, the plate units of each segment are hoisted separately and connected to form a segment as a whole through the vertical ribs. The present invention can reduce the use of large equipment and reduce the difficulty and cost of prefabrication construction.

The invention discloses a large-span box girder bridge time-varying reliability evaluation method considering concrete fatigue creep. The method comprises the steps that concrete static creep and shrinkage strain are calculated; calculating concrete fatigue creep strain generated by the vehicle load; constructing a concrete unified constitutive model considering a multi-factor coupling effect; establishing a long-term performance fine analysis numerical model of the large-span box girder bridge; establishing a large-span box girder bridge time-varying reliability calculation method; establishing a limit state equation of reliability analysis; and evaluating the structural time-varying reliability considering the concrete fatigue creep effect. According to the method, the time-varying reliability of the large-span box girder bridge under the coupling action of factors such as concrete static creep, cyclic creep and shrinkage can be accurately evaluated, and technical support can be provided for health diagnosis, maintenance and reinforcement of bridges of the same type.

The invention discloses a steel bar modular prefabricated box girder and a construction method. A steel bar framework is disassembled into a flange three-dimensional steel bar module, a top plate three-dimensional steel bar module, a web three-dimensional steel bar module and a bottom plate three-dimensional steel bar module; each reinforcing steel bar module forms a closed reinforcing steel bar cage structure matched with a flange, a top plate, a web plate and a bottom plate of the prefabricated box girder, a reinforcing steel bar framework with the large overall size is disassembled into the small reinforcing steel bar modules, construction and installation are convenient, each reinforcing steel bar module forms reinforcing steel bars in the corresponding area, hoisting and placing of the reinforcing steel bars and meshes one by one are not needed, and the construction cost is reduced. And meanwhile, the steel bar modules are connected through the local reinforcing steel bar modules, and the construction quality can be effectively improved.

Automated side forming device for box girders for high-speed railways with: a side forming mechanism (2) wherein a side forming flange plate part and a side forming web part are connected to each other; a support traverse (4) which is arranged symmetrically on two outer sides of the base of the side forming mechanism (2); a support mechanism of the side form (3), wherein this is provided in several groups at longitudinal intervals on both outer sides of the side form mechanism (2), wherein each group of the support mechanism of the side form (3) comprises at least two length-adjustable side form spacers, one end of which supports a corresponding section of the side form flange section and the section of the side form web section, the other end of which is connected to the support traverse (4); a lifting mechanism (5) which is spaced longitudinally below the support traverse (4) and whose upper end is connected to the support traverse (4) in a way that allows it to be raised.

The invention relates to the technical field of bridge maintenance equipment, and particularly discloses a prefabricated box girder maintenance device which comprises a device body, the device body comprises a plurality of bearing mechanisms and a spraying mechanism, the bearing mechanisms are arranged in an array mode in the length direction of a box girder, and each bearing mechanism comprises a first supporting frame and a second supporting frame; the bearing mechanisms are provided with first driving assemblies, the first driving assemblies are used for driving the multiple bearing mechanisms to move in the length direction of the box girder, the multiple bearing mechanisms are arranged at equal intervals, the bearing mechanisms have the folded state and the unfolded state, the multiple spraying mechanisms are arranged, and each spraying mechanism comprises a water pipe and a second driving assembly. A plurality of nozzles are arranged on the water pipe, and the second driving assembly is used for driving the water pipe to rotate around the axis of the water pipe so as to increase the spraying area of the nozzles; the device body can adapt to maintenance of box girders with different lengths through the unfolding degree of the bearing mechanism, and the maintenance efficiency can be improved.

The invention relates to the technical field of bridge construction, and discloses a bridge prestress tensioning device which comprises a prefabricated box girder, a plurality of tensioning assemblies are arranged on the prefabricated box girder, and the tensioning assemblies are used for applying tensioning force to the prefabricated box girder. The tensioning assembly comprises a corrugated pipe, a fixing clamping block, a first limiting block, a conical clamping sleeve clamping piece, a steel strand, a protective outer cover, a hydraulic driving assembly, a spiral fixing strip, a grouting hole, a second limiting block and a protruding block, and the spiral fixing strip arranged on the conical clamping sleeve clamping piece is in a spiral shape matched with the twisting direction of the steel strand; in this way, when the hydraulic driving assembly abuts against the second limiting block, the conical clamping sleeve clamping piece can exert certain twisting acting force on the steel strand, and therefore the fixing stability of the steel strand is enhanced, and the situation that in a traditional mode, when a clamping piece sleeve with the smooth inner wall is used for fixing, the clamping piece sleeve cannot be fixed easily is avoided. And the problem that the steel strand is difficult to fix stably for a long time due to single clamping force is solved.

The invention discloses a 3D box girder point cloud data topological structure identification method based on continuous coherence, and the method comprises the steps: S1, obtaining a point cloud of a box girder, carrying out the preprocessing of the point cloud, and generating a three-dimensional data set; s2, performing continuous homology analysis according to the three-dimensional data set to obtain topological characteristics of the box girder; s3, topological characteristics of the box girder are analyzed, and areas with structural problems are marked; and S4, according to the marked region, carrying out physical interpretation on the topological characteristics, and generating a health assessment report. Through a continuous coherence technology, in combination with topology analysis, noise robustness, geometric mechanics interpretation and multi-scale feature capture of point cloud data, multi-scale, robust and highly-interpretable topology structure analysis of the point cloud data of the box girder is realized, and complex topology features of the box girder can be comprehensively captured under different scales. The method overcomes the defects of a traditional geometric analysis method, and especially has higher robustness and reliability when processing the problems of noise, non-uniform point cloud data and the like.

The invention belongs to the technical field of steel reinforcement framework three-dimensional reconstruction, and particularly discloses an automatic high-precision three-dimensional dense reconstruction method for a box girder steel reinforcement framework, which comprises the following steps of: dividing a scanning area into a plurality of sub-areas according to a depth image by moving an inspection robot along the steel reinforcement framework, and performing multi-angle local scanning in each sub-area; constructing a local point cloud model by combining camera poses during acquisition, further calculating a relative spatial transformation relationship by using an overlapping region between adjacent local models, constructing a pose map and implementing global optimization, and uniformly adjusting the poses of the local models in a world coordinate system; and finally, all corrected local point clouds are fused to generate a complete global three-dimensional model, so that collaborative reconstruction operation of domain-divided scanning, segmentation reconstruction and global optimization is realized, frame-by-frame accumulation of errors in traditional scanning-while-splicing reconstruction is effectively blocked, long-distance drift is remarkably inhibited, and the precision of three-dimensional reconstruction of the reinforcement cage is greatly improved.

The invention relates to the field of image data processing, in particular to a prefabricated box girder template detection method and system, and the method comprises the steps: obtaining a surface image of a prefabricated box girder template, carrying out the edge detection of the surface image, and marking the surface image as a to-be-analyzed pixel point set; calculating the defect expression degree of the pixel points in the to-be-analyzed pixel point set, and obtaining the possibility that each edge connected domain in the to-be-analyzed pixel point set is a bump region according to the defect expression degree; in response to the fact that the possibility that each edge connected domain is a bulge area is larger than or equal to a defect threshold value, the edge connected domain is the bulge area, and a pixel point with the lowest gray value in the corresponding bulge area is selected as a seed point; and taking all the selected seed points as input points of a watershed algorithm so as to identify the bump defect in the surface image. According to the method, the change characteristics of the gray value of the bump area are analyzed, so that the seed point of the watershed algorithm is adaptively determined, and the detection accuracy is improved.

The invention provides a concrete elastic-plastic damage constitutive model construction method and system, belongs to the field of computers, and solves the problems that in the prior art, an integral or gradient enhanced regularization method is adopted to establish a non-local constitutive model, but the two methods require relatively fine finite element grid division, and numerical value implementation is very difficult. Comprising the following steps: 1, determining a damage variable, nominal stress, effective stress and an elastic-plastic damage stress-strain relationship, and decomposing the effective stress according to tension and compression characteristics; 2, in the effective stress space, a concrete elastic-plastic damage constitutive model is established; and step 3, based on an energy regularization method, determining a tensile damage variable, a compression damage variable and a corresponding stress-strain relationship, and in combination with a plastic loading and unloading rule, constructing a concrete elastic-plastic damage constitutive model based on energy regularization. The invention provides the construction method of the PC box girder concrete elastic-plastic damage constitutive model under the non-uniform constraint, and the application range is wide.

The invention relates to a simply supported girder bridge virtual construction optimization method based on a digital twin technology, and the method comprises the steps: building a BIM model which comprises a simply supported girder bridge BIM model, a girder field BIM model and an equipment BIM model; construction information data are collected, the construction information data are hung to the BIM model, and the construction information data comprise one or more of box girder production data, box girder transportation data and box girder erection data; a virtual construction system is constructed based on a digital twinborn technology, and real-time monitoring and visual display are carried out on the manufacturing, transportation and erection process of the simply supported girder bridge in combination with a BIM model. According to the simply supported girder bridge virtual building optimization method based on the digital twinborn technology, the construction progress can be mastered in real time according to the BIM model, and related data can be monitored; the virtual building system constructed based on the digital twinborn technology is combined with a whole-line BIM model to carry out real-time monitoring and visual display on the manufacturing, transportation and erection process of the simply supported girder bridge, interconnection and collaboration are achieved, and therefore the construction period is shortened, and the safety risk is reduced.

The invention relates to the field of metal wire machining, in particular to a feeding and conveying system for small box girder prestress positioning mesh production, which comprises a moving assembly and a tray, the tray is arranged at the moving end of the moving assembly, the tray comprises a mounting frame and a plurality of first supporting plates, and the first supporting plates are arranged on the top surface of the mounting frame; first clamping grooves allowing short ribs to be clamped in are formed in the first supporting plates, a plurality of sliding holes are formed in the top face of the mounting frame, a second supporting plate is arranged in each sliding hole, second clamping grooves allowing long ribs to be clamped in are formed in the second supporting plates, a guide rail is arranged in the mounting frame, and at least two sliding blocks connected with the second supporting plates are arranged on the guide rail. A first electric push rod is arranged on one sliding block, and a piston rod of the first electric push rod is connected with the other sliding block. The pre-stress positioning mesh laying device can meet laying requirements of pre-stress positioning meshes of different specifications, follow-up automatic welding is facilitated, and the production efficiency of the pre-stress positioning meshes is improved.