2386 results about "Box girder" patented technology

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 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 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 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.

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 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 multi-component non-landing construction bridging system comprises at least two main beams, the main beams are supported at the tops of box beams, cover beams or pier bodies through legs, supporting cross beams are arranged between the legs and the pier bodies, and the supporting cross beams stretch across the tops of the multiple pier bodies; at least one crown block is arranged at the top of the main beam, and the crown block is provided with a hoisting trolley capable of moving transversely and used for hoisting and installing a cover beam and a box beam. The bent cap is divided into two pieces in the longitudinal direction, the two pieces of bent cap are hoisted respectively, and the two pieces of bent cap are fixedly connected with each other when located at the top of the pier body. By the adoption of the structure, under the constraint that the legs do not fall to the ground, hoisting construction of the bent cap and the small box girder can be completed, and the device is suitable for the construction working conditions of three-dimensional overlapped elevated frames and spanning existing roads. And through optimization of the construction process, hoisting construction of the cover beam and the small box beam can be achieved within the range of the main beam only exceeding the length of two spans. By means of the scheme that the bent cap is installed in a split mode, the weight of the bent cap of the large-width bridge is greatly reduced.

The invention discloses a prefabricated box girder reinforcement cage forming method suitable for factory manufacturing, which is characterized in that a box girder reinforcement cage obtained by assembling an existing closed hoop is improved into a structure of a bottom web double-U mesh and a top plate double-layer mesh according to a'double-U + top plate 'forming and assembling thought; each type of reinforcing mesh can be automatically produced by bending, binding and welding equipment at the same time, the mesh is moved to a reinforcing steel bar framework assembling area through a special lifting appliance to form a box girder reinforcing steel bar framework, and meanwhile prestressed pipeline strand penetrating installation is carried out. The construction quality problems of strand pulling displacement, deformation damage and the like of the prestressed pipeline are solved, the subsequent prestressed tension safety quality is guaranteed, and the service life of the prefabricated PC box girder is prolonged.

The utility model relates to the technical field of support deviation rectification, and discloses a deviation rectification device for a cast-in-place box girder support, which comprises a base, a support frame and a positioning frame, a lifting mechanism is arranged on the support frame, and a deviation rectification mechanism is arranged on the positioning frame. A first motor is started to enable a rotating rod to rotate, and a gear and a toothed plate are in meshing transmission, so that a supporting column drives a positioning frame to be subjected to lifting adjustment, the device can meet the requirements of different construction environments and can flexibly cope with complex geological conditions, and the deviation rectifying effect on the cast-in-place box girder support is effectively improved; when the height of the support is adjusted, a positioning insertion rod is taken out from a locking disc so as to release locking and fixing of a rotating rod, after adjustment, the positioning insertion rod penetrates through a corresponding limiting hole and is inserted into a locking hole, locking and fixing of the rotating rod are achieved, and the situation that the rotating rod slides to cause deviation of the support, and consequently deviation correction operation is affected is prevented; and the stability of the bracket after height adjustment is effectively improved.

The automatic production equipment for the U-shaped reinforcing mesh in the box girder comprises a straightening structure, a bending structure and a welding assembly, the straightening structure is arranged on the upstream portion of the bending structure, and the welding assembly is arranged on the downstream portion of the bending structure; the reinforcing steel bars sequentially pass through the straightening structures, the bending structures and the welding assemblies to form an inner U-shaped reinforcing steel bar net. Steel bars are automatically produced to form inner U-shaped steel bars, then the inner U-shaped steel bars are in lap joint with longitudinal steel bars conveyed in the limiting holes, a plurality of lap joint welding spots are welded and fixed through the first welding gun and the second welding gun, the inner U-shaped steel bar mesh with the stable structure is formed, automatic control is achieved in the whole process, and the production efficiency is high; meanwhile, manual intervention is avoided, and the formed inner U-shaped reinforcing mesh is good in consistency, high in strength and suitable for continuous large-scale production.

The invention relates to a method for monitoring prefabrication and assembly errors of a steel box laminated continuous box girder bridge, and belongs to the technical field of data processing. The method comprises the following steps: collecting prefabrication and assembly error monitoring data of the steel box superposed continuous box girder bridge, and marking the data; an error prediction model is constructed, wherein the error prediction model comprises a physical constraint feature fusion layer, a causal convolution layer, a Bayesian uncertainty propagation layer, a residual attention mechanism module and a dual-channel gating fusion module; training the model by adopting the marked data; in the training process, optimizing the model by constructing mixed loss to obtain a trained model; and aligning timestamps of the collected structure parameters, construction processes, environment parameters and measurement and state parameters of the new prefabricated segment, integrating the parameters into an input sample isomorphic with the training set, and inputting the input sample into the trained model to obtain a prediction result. According to the invention, systematic deviation can be effectively eliminated, and high-robustness and high-precision error prediction is realized.

The invention discloses movable welding equipment for a box girder jig frame, which comprises a mounting base and locking assemblies uniformly assembled on the mounting base, and the locking assemblies are used for positioning the bottom of the box girder jig frame; the equipment further comprises a gantry type advancing frame assembled on the mounting base, and the gantry type advancing frame runs in the length direction of the base and is erected to the periphery of the box girder jig frame. A lifting platform is arranged on the gantry frame, two sets of outer positioning assemblies and two sets of inner positioning assemblies are installed on the platform in a sliding mode, and the inner positioning assemblies and the outer positioning assemblies are symmetrically arranged and located on the inner side and the outer side of the box girder jig frame respectively. The lifting platform is further provided with a flow dividing driving assembly which is responsible for transmitting power to the outer positioning assembly and the inner positioning assembly to drive the outer positioning assembly and the inner positioning assembly to operate independently. The clamping assembly comprises two sets of chucks which are symmetrically arranged, and the chucks are installed at the bottom of the outer positioning assembly in a sliding mode and move in the width direction of the installation base. According to the equipment, the welding precision and efficiency are remarkably improved, the stability and reliability of the equipment are enhanced, and meanwhile, the maintenance difficulty is reduced by simplifying a power system.

The invention relates to an automatic binding system for a reinforcement cage and application of the automatic binding system. The system comprises a control station, a binding jig frame, a four-way rail arranged in the circumferential direction of the binding jig frame, a four-way RGV arranged in a sliding mode in cooperation with the four-way rail, a sub-control piece, a mechanical arm, an identification piece and a binding piece, wherein the sub-control piece and the mechanical arm are arranged on the four-way RGV, and the identification piece and the binding piece are arranged at the output end of the mechanical arm. The control station is in communication connection with the sub-control piece and is used for directly or indirectly controlling the four-way RGV, the mechanical arm, the identification piece and the binding piece; the automatic binding system for the reinforcement cage is applied to binding of the reinforcement cages of T-shaped beams, box beams, pier columns and cover beams. The method has the advantages of improving the production efficiency and ensuring the batch steel bar binding result, and is suitable for batch production of steel bar cages of T beams, box beams, pier columns and cover beams.

The invention provides a box girder defect recognition method and system based on structured light and deep reinforcement learning, and relates to the technical field of box girder defect recognizing.The method comprises the steps that equipment integration and joint calibration are conducted on a to-be-detected box girder component, structured light projection is conducted according to a preset track, and a to-be-detected box girder component is obtained; the method comprises the following steps: triggering an event camera to image by utilizing controlled stroboscopic scanning of structured light, obtaining an event stream and a structured light depth map, carrying out representation conversion and multi-modal alignment, obtaining multi-modal mapping alignment data to carry out primary defect identification, obtaining an initial defect identification result, and triggering a deep reinforcement learning active perceptron to carry out perception strategy analysis. And obtaining a perception strategy analysis result, and carrying out deepening defect identification on the to-be-detected box girder component to obtain a defect identification result. The technical problems that in the prior art, box girder defect detection is low in detection efficiency, not high in accuracy and poor in detection comprehensiveness are solved. The technical effect of improving the efficiency, accuracy and comprehensiveness of box girder defect detection is achieved.

The invention discloses a 3D visual guidance steel box girder pushing and position adjusting method based on Beidou positioning. The method comprises the steps that a Beidou positioning device and an inclinometer are installed at a positioning datum point and a horizontal datum point of a steel box girder respectively; feature identifiers are installed on the box girder segments, and visual devices are correspondingly installed on the outer sides of the box girder segments and are used for monitoring three-dimensional displacement of the feature identifiers in the pushing process in real time; monitoring data of the Beidou positioning device, the inclinometer and the visual device are collected in real time, a dynamic three-dimensional model of the steel box girder is established, and the pushing posture and the pushing stroke of the steel box girder are adjusted on the basis of the dynamic three-dimensional model till the current box girder section reaches the designed mileage. According to the method, the dynamic characteristics of the steel box girder are perfected by taking the Beidou positioning data as the reference and utilizing the visual monitoring data and the inclination angle monitoring data, and the steel box girder pushing dynamic three-dimensional model is established, so that the pushing posture and the pushing stroke of the steel box girder can be automatically and accurately adjusted in the pushing process, and the efficiency and the safety of pushing construction are ensured.