2318results about "Bridge strengthening" patented technology

The invention discloses a construction method and a construction system for bridge joist pier replacement, and relates to the technical field of bridge construction.The construction method comprises the following steps that gate-type pier studs are arranged on the two sides of a to-be-replaced pier, two steel cover beams are arranged on the corresponding gate-type pier studs in the longitudinal direction of a bridge, and a sliding structure is arranged on the two steel cover beams; temporary supporting pieces are arranged on the two steel cover beams, and the bridge superstructure is supported through the temporary supporting pieces; a pier cap of the to-be-replaced pier is cut off, the pier cap is moved out through a sliding structure, and the steel coupling beam is moved to the position where the original pier cap is located through the sliding structure; and supporting the upper structure of the bridge by using the steel coupling beam, and removing the temporary supporting piece to complete pier replacement. According to the construction method, in the joist pier replacement process, the connection stability is high, the construction method is simple, and the construction efficiency and safety are ensured.

The invention relates to the field of intelligent transportation systems, discloses an intelligent highway maintenance system and method, and aims to solve the fundamental defects that in the prior art, the data acquisition dimension is single, the maintenance decision depends on artificial experience, and prospective prediction is lacked. The method comprises the following steps: acquiring multi-modal dynamic sensing data covering a whole road domain; constructing and updating a four-dimensional space-time digital twinborn model in real time; driving the causal graph neural network model to perform structure health state prediction and diagnosis; generating an active maintenance instruction through a multi-objective optimization engine; and the autonomous maintenance execution unit is dispatched to complete unmanned closed-loop operation. According to the method and the system, fundamental transformation of road maintenance from passive response to active prevention, from artificial experience to intelligent decision making and from discrete operation to closed-loop automation is realized, and the maintenance efficiency, the safety and the health level of the whole life cycle of the road are remarkably improved.

The present invention relates to a satellite monitoring method for detecting structural anomalies of a bridge by means of permanent scatterers of a first (IA) and a second (ID) satellite radar images time series, corresponding to opposite ascending and descending satellite orbital geometries along an axis of a satellite reference system. The method comprises a step A of selecting a common subset of permanent scatterers (PSP), a step B of temporal alignment of the time series, a step C of linear interpolation of the time series, a step D of defining a local mobile reference system M-LCRS of the bridge, a step E of projecting the time series in an END reference system, a step F of projecting the time series in the M-LCRS system, a step G of spatial averaging among the permanent scatterers of the common subset of the time series, a step H of processing according to a trendseasonal decomposition STL-LOESS method, and a step I of comparing with predefined thresholds for detecting structural anomalies.

The invention relates to an intelligent permeation grouting process and device for concrete crack self-repairing. The intelligent permeation grouting process and device are suitable for crack detection and repairing of a newly-built concrete structure. The device comprises a blood vessel network embedded into concrete, a crack detection sensor, a control module, a pumping module and a self-repairing material storage module, and automatic detection and repairing of cracks are achieved. The technological process comprises crack detection, data analysis, grouting parameter determination, material injection and repair monitoring. Through the automation and intelligence technology, the repairing efficiency and precision are remarkably improved, and the device is suitable for large structures such as bridges and tunnels.

The utility model discloses a crack maintenance device which comprises a cart plate, a connecting arm fixedly installed on the upper surface of one end of the cart plate, a grab handle fixedly installed at one end of the connecting arm, a locking disc fixedly installed on the upper surface of the cart plate, a material filling barrel fixedly installed on the upper surface of the locking disc, and a discharging pipe communicated with one end of the material filling barrel. The discharging pipe penetrates to the lower surface of the cart plate, a partition mechanism is slidably mounted in the discharging pipe, and the control end of the partition mechanism is fixedly mounted on the outer surface of the grab handle. By means of the design of the filling material barrel, a worker can accurately control flowing-out and stopping of filling materials by kneading the traction handle, through the design, the operator can conveniently control the flow of the filling materials, waste is avoided, and loss of the filling materials in unnecessary areas is reduced.

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

The utility model discloses an anti-scouring device for a river bridge pier, which relates to the technical field of bridge engineering and comprises a bottom support hoop, a first arc-shaped protective cover, a first mounting plate and a second arc-shaped protective cover, and one end of the top of the bottom support hoop is fixedly connected with the first arc-shaped protective cover. First mounting plates are fixedly connected to the two ends of the top and the two ends of the bottom of the first arc-shaped protection cover correspondingly, a second arc-shaped protection cover is slidably connected to the other end of the top of the bottom supporting hoop, and second mounting plates are fixedly connected to the two ends of the top and the two ends of the bottom of the second arc-shaped protection cover correspondingly. According to the bottom supporting hoop, the first arc-shaped protection cover, the first mounting plate and the second arc-shaped protection cover, the bridge pier is protected on the basis of buffering water flow, and therefore the problem that an existing river channel bridge pier anti-scouring device cannot buffer the water flow, and the anti-scouring effect is poor is solved.

The utility model relates to an adjustable steering block device for reinforcing external prestressed tendons of a bridge. The adjustable steering block device comprises a hollow slab beam and a steering block device body arranged on the lower side of the hollow slab beam. The steering block device comprises a bottom plate and a screw supporting plate located below the bottom plate, at least one set of adjusting screws are arranged between the bottom plate and the screw supporting plate, each set comprises two vertically-arranged adjusting screws, a steering block is arranged between the two adjusting screws in the same set, the section of the steering block is semicircular, and the arc-shaped face of the steering block faces downwards. The adjusting screw rod is in threaded connection with an upper adjusting nut and a lower adjusting nut which are used for clamping the end of the steering block in a matched mode. According to the adjustable steering block device for reinforcing the external prestressed tendon of the bridge, the damage degree to the bridge is small, the construction efficiency is high, the steering block is detachably installed, consumables are few, the height of the steering block can be adjusted by matching the adjusting screw rod with the adjusting nut, and the use is convenient. The height of the steering block can be directly adjusted according to the condition of prestress relaxation to improve the prestress degree of the prestressed tendon.

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

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

The invention relates to the technical field of bridge crack repairing, in particular to a bridge beam plate curing and reinforcing device which comprises a glue injection barrel, a glue injection opening and a glue pouring opening are formed in the glue injection barrel, a piston and an elastic piece are arranged in the glue injection barrel, the elastic piece pushes the piston to extrude repairing glue liquid to enter a crack, and an adjusting assembly is further arranged in the glue injection barrel. The adjusting assembly enables the force of the elastic piece for pushing the piston to be increased compared with the force of previous pushing, the repairing glue solution overcomes blockage in the crack and can permeate into the deepest position of the crack, and the multiple locking rods are arranged, so that the force of the elastic piece for pushing the piston each time is larger than the force of pushing the piston last time, and the repairing quality is improved. Therefore, the pushing force of the piston to the repairing glue solution is gradually improved, the glue solution in the crack can be ensured to be densely and uniformly distributed, the repairing quality problem caused by non-uniform flowing of the glue solution subsequently is avoided, and the strength after repairing is improved.

The invention relates to the technical field of beam bridge splicing, in particular to a large-span concrete continuous beam bridge splicing construction method based on intelligent construction. The method comprises the following steps: acquiring digital modeling data of a left bridge and a right bridge to be spliced; analyzing the digital modeling data, and determining the dynamic stress distribution of the whole construction process; acquiring deformation monitoring data in real time, analyzing the deformation monitoring data, and determining a coordinated deformation rule of the left and right bridges; and generating a splicing construction scheme according to the dynamic stress distribution and the coordinated deformation rule. And the decoupling problem of a digital model and a physical entity is eliminated. The problem of stress control blind areas is solved, stress space-time evolution is quantified, it is ensured that stress prediction covers all stages of construction, and the blind areas of a conventional static model are avoided. The problem of quantitative deficiency of the coordination deformation rule is solved, and the defect of neglecting the deformation coordination is avoided. The problem of construction decision lag is solved, the structural damage probability and temperature cracks are reduced, and coupling of construction execution and a physical mechanism is ensured.

The invention belongs to the technical field of asphalt stirring, and discloses an asphalt stirring device based on road and bridge pothole filling, the asphalt stirring device comprises a base, a stirring and scraping mechanism is arranged above the base, the stirring and scraping mechanism comprises a mixing tank, asphalt is fully stirred through the stirring and scraping mechanism, and through a sleeve in the stirring and scraping mechanism, the stirring and scraping mechanism is driven to rotate; according to the double-shaft driving design of the rotating pipe, an efficient and synergistic stirring and scraping system is constructed, the inclined face of an arc-shaped scraping plate is attached to the inner wall of the mixing tank and matched with a wear-resistant ceramic coating, adhered asphalt is scraped in real time in the rotating process, meanwhile, the rotating pipe synchronously rotates, radial stirring is achieved through external stirring blades of the rotating pipe, and a spiral lifting piece pushes bottom asphalt to axially flow; by matching with the turbulent flow effect of the U-shaped heat conduction pipe, the asphalt forms a three-dimensional flow field in the tank, an auxiliary agent and the asphalt are fully fused, the problem of non-uniform mixing caused by traditional single-dimension stirring is solved, the stable performance of the asphalt is guaranteed, and a basic support is provided for crack resistance and water damage resistance after pavement filling.

The invention discloses a combined type cable deicing device and method.The combined type cable deicing device comprises a cable sliding box and a combined type deicing device body, the combined type deicing device body comprises an ultrasonic deicing module, a mechanical deicing module and an electric heating ice melting module, and the mechanical deicing module comprises a rotating base assembly and a rotating driving disc; the rotary base assembly is fixed in front of the cable sliding box through a connecting frame, a motor is installed on the rotary base assembly, a cutter base is installed on the front side of the rotary driving disc, at least one deicing blade is installed on the cutter base, and an electric heating ice melting module is installed on the rear side of the rotary driving disc; a power module electrically connected with the ultrasonic deicing module, the motor and the electric heating ice melting module is arranged in the cable sliding box. The detection processing system obtains the state of the icicles in front, the controller controls the ultrasonic deicing module, the mechanical deicing module and the electric heating ice melting module to work independently or / and work intensity in a combined mode, and the most suitable deicing operation mode can be adopted according to different icicles.

The invention discloses an asphalt pavement crack repairing method based on laser fusion and a crack filling material thereof. The asphalt pavement crack repairing method comprises the following steps that S01, asphalt pavement cracks are accurately detected; s02, the asphalt crack is preprocessed, and parameters of an asphalt pavement material are determined; s03, parameters of a joint filling material are determined; s04, performing laser simulation on the asphalt pavement; s05, joint filling materials are evenly added into the cracks; and S06, performing laser fusion on the asphalt crack. According to the repairing method, the heat energy can be accurately controlled through laser, it is ensured that the crack is repaired under the condition that surrounding asphalt is not damaged, accurate parameter adjustment of different cracks is achieved, a more efficient, more accurate and environment-friendly asphalt crack repairing scheme is provided, repairing is rapidly completed, and the traffic closing time and the construction time are shortened.

The utility model belongs to the technical field of bridge engineering, and particularly relates to a structure for widening a new bridge and an old bridge flexibly by adopting telescopic steel bars, which comprises a bridge web, a mounting groove, a fixing plate unit, the steel bars, pipe bodies and a tensile combination block unit, so that 1, a combined sleeving structure of a plurality of steel bars and a plurality of pipe bodies has enough flexible deformation capability, and the tensile combination block unit can be used for widening the new bridge and the old bridge; the new and old bridges are allowed to generate proper relative displacement in the vertical direction and the longitudinal direction; 2, the combined sleeving structure is still an integrated connecting structure, so that the vertical load can be fully transmitted, and the old bridge is further protected; 3, the new bridge and the old bridge are difficult to be far away from each other greatly in the transverse bridge direction, so that the basic function of widening connection is realized; and 4, when the fixing plate unit is installed, the new and old bridge structures do not need to be greatly changed, and the structural strength of the new and old bridges cannot be greatly damaged.

The invention provides a galvanized bridge steel wire winding device, and relates to the technical field of bridge construction equipment, the galvanized bridge steel wire winding device comprises a connecting seat, a clamping device I, a connecting guide rail, a separable winding mechanism, a walking device and a clamping device II; the device has the advantages of being reasonable and simple in structure, low in production cost, convenient to install and complete in function, stable fixation of the device and a bridge main cable can be achieved through the synergistic effect of multiple clamping structures, the situation that the device shakes or is separated from the main cable in the operation process is effectively avoided, operation safety is guaranteed, winding uniformity of galvanized steel wires is guaranteed, and the service life of the device is prolonged. The protection effect of the main cable is improved; the winding mechanism capable of being separated and combined is adopted, the opening and closing state of the winding mechanism can be flexibly adjusted in cooperation with a specific driving structure, the device can adapt to bridge main cables with different diameters, frequent replacement of assemblies or adjustment of the overall structure is not needed, operation is convenient and fast, consumed time is short, and meanwhile the installation difficulty of winding operation of the middle section of the bridge main cable is reduced.

The utility model relates to a mounting type arch bridge main arch ring maintenance operation platform which comprises a walking system, a suspension system, a platform system and a platform lifting system. The walking system is provided with walking trolleys on the top faces of the two sides of the main arch ring respectively and can walk along rails arranged on the main arch ring, the suspension system is suspended on the two walking trolleys through a cantilever beam, platforms on the two sides of the platform system are located on the two sides of the main arch ring respectively, a lower platform is located below the main arch ring, and a winch of the lifting system is arranged on the suspension system. And the side platform and the lower platform are connected through a traction rope. The main arch ring maintenance platform is directly hung on a main arch ring and walks along the main arch ring, bridge floor traffic can be prevented from being affected, and constructors can carry out all-directional maintenance operation on the main arch ring on the platform.

The utility model relates to the technical field of joint filling, in particular to a joint filling device for road and bridge construction, which comprises a grouting pipe, a joint filling nozzle fixedly connected to the bottom of the grouting pipe, a spring baffle fixedly connected to the bottom of the outer wall of the grouting pipe, a guide sleeve slidably connected to the bottom of the outer wall of the grouting pipe, and a push plate fixedly connected to the bottom end of the guide sleeve. A cover cylinder is fixedly connected to the middle of the bottom end of the push plate, and a vibration plate is fixedly connected to the bottom of the cover cylinder. The grouting device has the advantages that after the material conveying pipe connector is connected with a grouting pipeline, the gap filling nozzle is aligned with a gap and tightly presses the gap, at the moment, the vibration plate is tightly pressed to the edge of the gap, then the gap is grouted through the gap filling nozzle, and meanwhile the vibration assembly is started to drive the guide sleeve to vibrate up and down; and vibration is conducted to the surface of the road bridge through the vibration plate, so that the repaired gap is vibrated heavily, the filler is vibrated to flow into the gap more stably to discharge bubbles, and the filler fills the gap more compactly.

The invention relates to the technical field of bridge construction, and particularly discloses a steel box girder segment hoisting construction error three-dimensional fine adjustment system which comprises a concrete tower column and a first steel box girder segment, the first steel box girder segment is installed on one side of the concrete tower column, and a second steel box girder segment is arranged on the other side of the first steel box girder segment. Measuring points are arranged at the four corners of one side of the second steel box girder section, and the laser scanner can observe the position changes of the four measuring points through the arrangement of the laser scanner, so that the control module can control the use of the three-dimensional jack and the posture adjusting assembly in real time; the position and posture of the second steel box girder section are adjusted, the angle and the real-time three-dimensional position of the second steel box girder section can be adjusted at the same time, accurate and efficient adjustment is achieved, the real-time hoisting position of the second steel box girder section is comprehensively monitored, and the bridge quality is improved.

The invention discloses a high-efficiency cable intelligent control method and system for a steel box truss arch bridge, and the method comprises the steps: 101, sampling the tensioning force of all cables according to a preset sampling period, generating the tension time sequence data of all cables, dividing the tension time sequence data of each cable into a plurality of main windows, each main window is divided into a plurality of sub-windows; 102, sub-windows in each main window are divided into static state sub-windows and dynamic state sub-windows, and the main windows with the number of the dynamic state sub-windows exceeding a dynamic number threshold value serve as dynamic section main windows; and step 103, judging whether each dynamic state sub-window in the dynamic section main window has cable drift or not, and if the cable drift occurs, adjusting the cable.

The invention relates to the field of buildings, in particular to an externally-reinforced concrete-filled steel tube column and a peak bearing capacity calculation method, and the externally-reinforced concrete-filled steel tube column comprises a steel tube and core concrete located in the steel tube; a UHPC layer is poured on the outer ring of the steel pipe, the section of the outer ring of the UHPC layer is square, and the center line of the UHPC layer coincides with the axis of the steel pipe. Stirrups located on the outer ring of the steel pipe are embedded in the UHPC layer, and longitudinal steel bars are arranged on the inner ring of the stirrups in the vertical direction. The invention provides an external reinforcement type concrete filled steel tubular column. The method can reinforce the concrete filled steel tube with the annular void area, so that the actual bearing capacity of the concrete filled steel tube exceeds the original design value level. The invention further provides a method for calculating the peak bearing capacity of the externally-reinforced concrete-filled steel tube column, the peak bearing capacity of the reinforced concrete-filled steel tube can be quantitatively evaluated, and a theoretical basis is provided for subsequent use and maintenance of the concrete-filled steel tube.

The invention discloses a high-performance concrete repairing material, application and a concrete structure repairing method, and belongs to the technical field of concrete structure repairing. The high-performance concrete repairing material is prepared from Portland cement, rapid hardening cement, an inert mineral admixture, an early strength agent, a submicron mineral admixture, a nano material, an anti-freezing binder, fibers, a retarder, a volume compensating agent, fine aggregate, coarse aggregate, a water reducing agent, a defoaming agent and water. Through the interaction of all the components, the functions of early strength, volume stability, freezing resistance, salt freezing resistance, fracture resistance, shrinkage resistance and the like are achieved, through the synergistic effect of all the components in the material, the overall performance of the material is improved, and the material has excellent adaptability and multifunctionality under different environmental conditions; therefore, long-term stable guarantee is provided for application in various damage scenes, and the proportion of each component of the material can be adjusted according to actual requirements of concrete structures so as to meet efficient repair in different damage scenes.

The invention belongs to the field of reconstruction construction of fabricated buildings and public buildings, and particularly relates to a disengagement type internal force balance additional awning reconstruction structure suitable for an existing pedestrian overpass, which comprises a disengagement type additional space prestress tension cable net awning structure; the overground tensioning internal force balance structure is provided with an outer wrapping strengthening structure, a lateral force resisting transformation structure and a tensioning internal force cable-strut system balance structure which are arranged on the basis of an existing pier system. The outer wrapping strengthening structure is arranged on the existing pier column, and the lateral force resistance transformation structure is connected to the outer wrapping strengthening structure of the existing pier column. And the tensioning internal force cable-strut system balance structure is connected between the lateral force resistance transformation structure and the disengagement type additional space prestress tensioning cable net awning structure, and is configured to change the direction of the tensioning cable force of the upper disengagement type additional space prestress tensioning cable net awning structure and transmit the tensioning cable force to the overground tensioning internal force balance structure. The additional awning is separated from the existing bridge body, and additional influence is generated on the existing bridge body structure.

The invention relates to the technical field of seismic resistance and transformation of civil engineering structures, and particularly discloses a novel quick replacement device and method for a seismic isolation support. Pre-pressing and accurate positioning of a new shock insulation support are achieved through the counter-force supporting frame and the pre-pressing system, rapid dismounting of an old or damaged shock insulation support and mounting of the new support are achieved, micro jacking can be conducted on an upper structure within a small disturbance range, the replacement efficiency is remarkably improved, and the construction risk is reduced.

The anti-deformation bridge steel structure comprises a bridge steel structure body, four first clamping grooves are annularly formed in the inner wall of the bridge steel structure body, openings are formed in the front sides and the rear sides of the first clamping grooves, reinforcing plates are movably installed in the first clamping grooves in a clamped mode, and a cylinder is arranged in the bridge steel structure body; through cooperation of the reinforcing plates and the cylinders, the interior of the bridge steel structure body is supported, and the four reinforcing plates are sleeved with the cylinders in a sliding mode. Through the arrangement of a series of structures, the interior of the bridge steel structure main body can be reinforced and supported through the four reinforcing plates and the cylinders, the anti-deformation effect can be effectively achieved in cooperation with injected structural adhesive, and the four reinforcing plates can be adjusted according to the inner diameter of the bridge steel structure main body; and the device can be suitable for bridge steel structure bodies with different inner diameters, manual cutting operation is not needed, the application range is widened, and the use flexibility is improved.

The invention relates to the technical field of bridge engineering maintenance decision, and discloses a bridge maintenance decision method based on big data. The method comprises the steps of collecting bridge monitoring data through a sensor network, performing hierarchical processing on an original data stream, identifying and packaging abnormal fluctuation, trend change and a periodic mode, and forming a structured health event sequence. And dynamically constructing and updating the digital sign profile of the bridge in combination with the design parameters and the material degradation model. And when a decision is triggered, simulating a performance evolution path under multi-factor coupling based on the profile, generating a future maintenance scene set, and matching and assembling a preliminary plan from historical cases and the knowledge graph. And outputting a final maintenance instruction list sorted according to priorities by performing resource and time coupling analysis and multi-target tradeoff on all plans. According to the method, deep analysis and prospective simulation of the bridge state are realized, and the intelligence, accuracy and performability of maintenance decision making are improved.

The invention provides a beam replacing machine for dismantling and replacing a railway simply-supported T-beam under the railway operation condition, and the beam replacing machine is characterized in that a main beam is provided with two crane carriages which are mounted on the main beam and move along the main beam; the number of the main supporting legs is two, the main supporting legs comprise two C-shaped half supporting legs, the tops of the two half supporting legs are hinged to the left side and the right side of the main beam respectively, and the two half supporting legs can be driven by the folding mechanism to horizontally rotate till the two half supporting legs are folded with the main beam; telescopic stand columns are arranged in the two half supporting legs; the left sides and the right sides of the two walking wheel sets are hinged to the bottoms of the two C-shaped half supporting legs correspondingly, and the walking wheel sets are used for driving the whole beam changing machine to walk. The number of the auxiliary supporting legs is two, and the auxiliary supporting legs are provided with overturning mechanisms used for controlling the auxiliary supporting legs to be integrally and vertically overturned to be parallel to the main beam and lifting mechanisms used for controlling the auxiliary supporting legs to be integrally lifted up and down. The beam replacing device has the advantages of simple structure, convenience in operation, short beam replacing construction period and the like.

To provide a technique for evaluating residual proof stress in a structure such as a pier.SOLUTION: A machine learning section 12 performs machine learning that uses teacher data using a deterioration degree of a pile and an external force condition to the pile as explanation variables and a damage state of the pile as an objective variable to generate a learned model. A recording section 13 records the learned model generated by the machine learning section 12. An input section 14 inputs the deterioration degree of the pile that becomes an evaluation target and the external force condition to the pile to the learned model recorded in the recording section 13 as input items. A determination section 15 determines use propriety of the pile when external force in accordance with the external force condition is applied, on the basis of the damage state of the pile obtained in accordance with the input to the learned model by the input section 14. An output section 16 outputs damage state data corresponding to the damage state of the pile obtained in accordance with the input to the learned model by the input section 14 and use propriety data corresponding to use propriety of each pile constituting a pier.SELECTED DRAWING: Figure 2