251results about How to "Guaranteed normal passage" patented technology

The invention discloses a lane adjusting method for urban artery turning traffic. The method is used for relieving tidal flow in urban roads and mainly comprises the number of variable lanes in need of direction changing and a lane turning function determining method after lane adjustment. The method comprises that variable-direction traffic setting conditions of urban arteries are given, the number of variable lanes and the lane turning functions after lane adjustment are determined by combining control of tidal intersection signals, and intersection delay values are calculated and compared to obtain the lane adjusting method for urban artery turning traffic. According to the lane adjusting method, the intersection signal control and the variable-direction traffic technology are combined, so that the tidal traffic jam is relieved, the delay is reduced, and the utilization rate of existing road resources is improved effectively.

The invention discloses an abnormal parking judgment method and an abnormal parking judgment device. The abnormal parking judgment method includes the steps of firstly, acquiring video frame information from video equipment; secondly, acquiring information of a target car from the video frame information by a target analysis algorithm, and then judging whether the target car meets conditions of abnormal parking or not according to the acquired information of the target car, if the target car meets the conditions of abnormal parking, then judging that the target car is in abnormal parking. According to the method and the device, video frames acquired from the video equipment are analyzed by an intelligent algorithm, whether the target car is in abnormal parking such as parallel parking, crossing parking, bias parking and reverse parking can be judged in time, so that the abnormal parking car can be handled to guarantee normal road traffic.

The invention discloses an intelligent networked automobile formation control method and system for coping with communication abnormity. According to the invention, the driving data of each vehicle isacquired through the position acquisition unit, the speed acquisition unit and the acceleration acquisition unit, the data is interacted through the communication unit, and a front vehicle-pilot vehicle following vehicle formation topological structure is established. When communication is normal, according to the ideal vehicle distance calculation model, the multi-input and multi-constraint characteristics of the actual traffic environment are combined, meanwhile, the abnormal condition existing in the communication process is considered, and intelligent network connection vehicle formationcontrol is established based on model prediction control; and when the communication is abnormal, different formation switching modes are determined to be adopted according to the motorcade positionsof the abnormal vehicles. Interference of abnormal communication vehicles on driving of the whole motorcade can be solved, and normal passing of the vehicles is guaranteed.

The invention discloses a method and a unit for extracting traffic attack message characteristics on network equipment. The method comprises the steps of: selecting a network message type which needs to extract message characteristics and is taken as an attack traffic type; taking a header field of a message with the selected type as an item, and finding all frequent item sets which meet the requirement of minimum support in the received network message with the selected type; performing descending sort on all the found frequent item sets according to element numbers, and then performing descending sort on the frequent item sets with the same element number according to the support; and sequentially selecting a group of minimum sets of frequent item sets which meet the requirement of a message filtration proportion threshold value as the attack message characteristics of the message with the selected type from the sorted frequent item sets. The method and the unit overcome the one sidedness of a traffic characteristic extraction method, can accurately filter, avoid error killing, and guarantee the normal pass of valid network traffic.

The invention discloses a high-flux police dynamic face acquisition comparison method and system. The method comprises the following steps: 1, rapidly detecting and snapshooting dynamic faces; 2, performing background system analysis; 3, performing three-dimensional rectification restoration; and 4, performing image preprocessing, feature extraction and comparison. According to the high-flux police dynamic face acquisition comparison method and system related to by the invention, for such features as many police portrait data image types, large quality differences, large data scale, diversified application scenes and the like, through a high-accuracy and rapid portrait feature extraction and comparison method, in a portrait comparison process, image deviations generated by the faces due to postures, decorations, illumination, focusing and the like are overcome, rapid and accurate comparison of face features is realized, a face identification technology is enabled to play an important role in actual application, and the method and system have application prospect.

The invention discloses municipal road indicating equipment for the sponge city. The municipal road indicating equipment for the sponge city comprises a support pillar, wherein an indicator plate is fixedly connected to the side wall of the support pillar; a dust prevention mechanism is arranged on the side wall of the indicator plate and comprises an installation box; the installation box is fixedly connected to the side wall of one end, far away from the support pillar, of the indicator plate; openings communicating with the outside are formed in the front side wall and the back side wall ofthe installation box; an installation rod is fixedly connected to the inner wall, close to the bottom end, of the installation box; a rubber barrel is fixedly connected to the upper wall of the installation rod; a tuning fork is fixedly connected into the rubber barrel; furs are fixedly connected to the side wall of the tuning fork; multiple ventilation holes are formed in the side wall of one end, far away from the indicator plate, of the installation box; and a reciprocating screw rod is rotatably connected to the upper wall of the installation rod through a bearing. According to the municipal road indicating equipment for the sponge city provided by the invention, the amount of dust attached to the side wall of the indicator plate can be greatly reduced, and the indicator plate can beautomatically cleaned, so that time and effort are greatly saved, and the personal safety of people and the normal passage of traffic are further ensured.

The invention discloses a motor vehicle wheel. The wheel includes: the rim 1 is a combination of multiple sets of rubber wheel surface blocks that rotate freely around the hinge point and connects end to end to form a flexible hinge chain ring. Each two sets of rubber wheel surface block assemblies are hinged and fixed on the outer end of the piston rod and can Rotation; the spokes are composed of multiple sets of telescopic cylinders 2 with built-in tension springs uniformly distributed along the circumference; the hub 3 is composed of connecting power source and supporting interface, compressed air connection port and equipped with motorized and neutral gear switching devices. Control the telescopic thrust of the cylinder according to the road conditions, so that the flexible rim can change the shape of the outer rim where the force is applied by amplitude modulation, and automatically adapt to various terrains such as continuous steps, pits, bumps, and slippery roads, so as to generate sufficient grip friction and improve obstacle surmounting And the ability to pass through various road surfaces. The telescopic cylinder buffers and absorbs the bumps and vibrations of the road surface to ensure smooth and comfortable operation at the hub.

The invention relates to a ramp control method based on congestion situation grading, and the method comprises the steps: carrying out the analysis of historical data, carrying out the clustering through a Gaussian mixture model to redivide a congestion situation, because a critical occupancy is usually difficult to obtain, and the inaccuracy of the occupancy will directly affect the performancesof an ALINEA algorithm. Traffic flow is taken as a control parameter of the ALINEA algorithm, the control rate is adaptively selected according to the congestion situation, a segmentation control method is adopted to increase queuing length constraint to avoid influence of overflow generated by overlong ramp queuing on ground traffic, and the control target is transferred to the ramp when queuingis overlong. The simulation experiment is carried out by utilizing SUMO simulation software, and the result shows that ramp queuing and waiting time of vehicles are optimized to different extents under the condition of ensuring passing of the main line so that the road passing efficiency is improved.

The invention relates to a pre-added axial force based circular support system in a shield tunnel and a construction method of the system. The circular support system comprises an annular section steel and steel plate combination, bearers vertical to a shield segment are arranged between the section steel and steel plate combination and the shield segment, the section steel and steel plate combination is divided into multiple segments in the circumferential direction, each segment comprises arc-shaped section steel, the different segments of the arc-shaped section steel are connected via connecting steel plates, and connecting positions are provided with spiral jacks. The spiral jacks apply pressures, the pressures are transferred to the bearers, so that a stress is distributed in the shield segment uniformly, and the continuous rigid integral support system with a pre-stress is formed; and thus, the shield segment is reinforced and supported effectively, and the shield segment is prevented from deformation, cracking, damage and even a safety accident due to concentrated pre-stress of holes in the shield segment in a connection channel.

The invention discloses a three-dimensional compound traffic system which comprises a plurality of elevated piers arranged on the ground road surface. The upper end of each elevated pier is provided with a pier cap beam; a viaduct road surface is laid on the pier cap beams; connecting parts are embedded in the lower portions of the pier cap beams; a rail beam is hung on the lower portion of each connecting part; and an aerial rail train is hung on the lower portion of each rail beam. The three-dimensional compound traffic system is developed by utilizing the surplus space under an elevated road and over the ground road surface and has the advantages of high practicality, high space utilization rate, low manufacturing cost and attractive appearance.

The invention discloses a paddy field leveller. The paddy field leveller comprises a suspension bracket which is connected with a tractor; an oil cylinder and a large scraper are arranged on the suspension bracket; the large scraper is connected with the suspension bracket through a plurality of movable link shafts; a piston rod of the oil cylinder is connected with the large scraper; a folding oil cylinder, a supporting block and a small scraper are respectively arranged on two sides of the large scraper; a piston rod of the folding oil cylinder is connected with the small scraper through a connecting rod; the connecting rod is connected with the supporting block through a rotary shaft; and the small scraper is movably connected with the large scraper through the rotary shaft. The paddy field leveller can work with a wide range of eight metres and is high in working efficiency, foldable, high in safety and convenient to use. The paddy field leveller can run on a vehicle road, can scrape a paddy field, can level the field, and can be easily and flexibly operated. The payload of workers and production cost are reduced.

The invention relates to the technical field of subway tunnel construction, and provides a subway tunnel lining trolley. On the premise that portal units and supporting accessory units are certain, a bracket unit and template units are specifically designed, and therefore it is guaranteed that the trolley is suitable for subway tunnels with different profile sections. Portal vertical columns are in an inclined structural mode, the length of a portal beam meets requirements, and space between the portal vertical columns and portal longerons is increased; the two ends of the portal beam are designed to be in a stepped shape, portal upper longerons are installed in steps, and therefore the installation height of the portal upper longerons is reduced; the clearance of the portal units is increased through the design. In addition, small moving dies are designed in a bottom chamfer structural mode; the portal longerons are lengthened in the tunnel length direction, and a deforming mechanism and a climbing mechanism are installed on the portal longerons; the demold amount of the trolley is increased through the design, and it is guaranteed that the template units do not easily interfere with the deforming mechanism or the climbing mechanism in the die assembly process.

The invention provides a tunnel inverted-arch self-propelled trestle. Walking supports and horizontal moving oil cylinders are arranged below a trestle body, inverted-arch side formworks are arranged on the two sides of the trestle body, and thus the trestle can move front, back, left and right. When a construction vehicle walks to a construction road section through the trestle, concrete is poured, and inverted-arch work is started through the inverted-arch side formworks. A rear approach bridge is arranged behind the trestle body, a driving wheel is arranged below the rear end of the trestle body, the walking supports are arranged below the trestle body, a front approach bridge is arranged in front of the trestle body, a front trestle brace is arranged below the front approach bridge, the integral horizontal moving oil cylinders are arranged below the front end of the trestle body, foot margin oil cylinders are arranged below the integral horizontal moving oil cylinders, side formwork systems are arranged on the two sides of the trestle body, and formwork horizontal moving oil cylinders are arranged above the side formwork systems. The tunnel inverted-arch self-propelled trestle is simple in structure and low in cost and fault rate, inverted-arch construction can be carried out while vehicle traffic is ensured, the tunnel building speed can be effectively ensured, and building accidents are effectively reduced.

The invention discloses a supporting device for a frame structure. The supporting device for the frame structure comprises frame columns, a frame beam, fixing hinge supports, upper supporting rods, shaft pins (a), shaft pins (b), shaft pins (c), lower support rods, snap rings, sliding blocks, chutes, sleeves and an air hoist, wherein the frame beam is arranged on the frame columns in a lapped manner; the fixed hinge supports are positioned at the midspan position of the frame beam and are connected with the upper supporting rods through the shaft pins (a); the upper supporting rods are connected with the lower supporting rods through the shaft pins (b); each lower supporting rod is provided with the corresponding snap ring and is connected with the corresponding sliding block through the corresponding shaft pin (c); each sliding block slides in the corresponding chute; the chutes are positioned in the frame columns; the sleeves are sleeved on the upper supporting rod; and hooks of the air hoist hook the upper supporting rods. The supporting device for the frame structure has the advantages that the supporting device is folded at ordinary times, and usage of space of a building is not affected; the supporting device is unfolded in urgent conditions or in a sudden disaster, the structure rigidity is improved, and a building structure has quite high anti-seismic and shock-resistant abilities in a short time.

The invention discloses a large-span steel box arch rib segmented assembling and integral lifting construction method. The method comprises the following steps that S1, a side arch section support system, a middle arch section support system and a gate-type integral lifting support are erected, a passage channel is reserved between supporting supports of the middle arch section support system, andthe gate-type integral lifting support is located at two ends of the design position of a middle arch section arch rib; S2, arch ribs of the side arch sections are installed at the designed bridge positions; S3, middle arch section arch ribs are located below the designed bridge location, and the middle arch section arch ribs and the middle arch section support system are assembled into a whole;and S4, middle arch section arch rib hoisting construction is carried out. The method is advantaged in that normal passage of a channel is guaranteed, welding quality control difficulty is lowered, and in-place precision of the arch rib sections is guaranteed.

The invention relates to a construction device for in-situ maintenance or extension of a highway tunnel. The construction device comprises a steel protective cover for the in-situ maintenance or the extension of the tunnel. The construction device is characterized in that the steel protective cover is commonly composed of portal frames, a skin covered steel plate and a slide groove; a plurality of the portal frames are arrayed along the longitudinal direction to form a framework of the steel protective cover; the skin covered steel plate is connected with an outer side flange plate of each frame by a skin covered steel plate bolt so as to form a closed inner space; traffic vehicles can pass in the closed space and construction machines can walk above the steel protective cover to carry out various types of maintenance work on tunnel linings; the slide groove is fixedly arranged on a previous road surface by an anchor bolt and each portal frame is connected into the slide groove by the bolt; and the slide groove provides a support pressure to the steel protective cover and also provides guiding orientation on the movement of the steel protective cover. According to the construction device for the in-situ maintenance or the extension of the highway tunnel, a traffic pressure caused by closed traffic controls is greatly relieved, and the adverse effects to public benefits and social benefits, caused by maintenance or extension engineering, are reduced greatly.

The invention discloses a ship with an adjustable ship squat and an adjustable ship width. The ship comprises a ship body. The two sides of the ship body are each provided with ship width adjusting mechanisms and squat adjusting mechanisms, wherein the ship width adjusting mechanisms are used for changing the ship width, and the squat adjusting mechanisms are used for changing the ship squat. Each ship width adjusting mechanism comprises a turnover plate, supporting rods, a first containing cabin and a driving device, wherein the turnover plate is hinged to the side edge of a deck of the ship body, the first containing cabin is arranged in a double-layer hull on the ship board portion of the ship body, the driving device is installed in the first containing cabin, one end of each supporting rod is supported by the turnover plate, the other end of each supporting rod is hinged to the first containing cabin, and the middle portion of each supporting rod is hinged to the driving end of the driving device. Each squat adjusting mechanism comprises a second containing cabin, an inflating and deflating device and an extensible air bag, wherein the second containing cabin is arranged in double-layer hull on the ship board portion of the ship body, the inflating and deflating device is installed in the second containing cabin, and the extensible air bag is communicated with the inflating and deflating port of the inflating and deflating device and can extend out of the ship body. The first containing cabins and the second containing cabins are arranged in a staggered mode.

The invention discloses a narrow area ultra-deep channel inclined well back excavation construction method. The narrow area ultra-deep channel inclined well back excavation construction method comprises the following steps of (1), construction lofting, (2), advance support, (3) freeing surface excavation, (4), measurement lofting, (5), static blasting, (6), rock breaking and residue soil outward transporting and (7), primary support. According to the back excavation construction method, excavation is conducted from bottom to top, the occupied ground road area is small, normal traffic of a road can be guaranteed, and additional pressure is not brought to transportation; residue soil in the inclined well construction process can be transported out directly with residue soil in a main channel, so that the secondary carrying process is omitted, used equipment is simple, personnel input is less, cross operation can be conducted, the construction period is shortened, and the cost is reduced by a large margin; and after rock breaking is conducted through static blasting, manual work and a machine are matched to conduct clear-up and excavation, the residue soil is directly loaded into a vehicle through an excavator after blasting and directly transported to a residue field through a main tunnel, disturbance of inclined well excavation to tunnel bedrock on the two sides and an upper rock stratum is reduced, and construction safety is guaranteed.

The invention discloses a high-speed ice breaking vehicle by utilizing super magnetostrictive devices. The high-speed ice breaking vehicle comprises a chassis, a compartment, a cooling oil tank and a plurality of super magnetostrictive devices. The compartment is fixedly installed on an upper plane of the chassis, walking wheels are connected with a lower plane of the chassis, the cooling oil tank is installed in the compartment, and the super magnetostrictive devices are transversely installed in the compartment. Each super magnetostrictive device comprises an outer shell, an upper end cap and a lower end cap, wherein the upper end cap is arranged on the upper portion of the outer shell, the lower end cap is arranged on the lower portion of the outer shell, and a coil frame is arranged inside the outer shell. According to the high-speed ice breaking vehicle, the super magnetostrictive devices drive ice breaking nails to reciprocate at a high speed to knock and smash accumulated snow and ice blocks on the ground below the chassis and quickly clear away ice on a road; in addition, through the arrangement of the cooling oil tank, oiling and cooling on the super magnetostrictive devices can be achieved, the service life of the high-speed ice breaking vehicle is prolonged, large-thickness ice layers formed on the road of a cold region can be eliminated well, and normal passage of the city road is effectively guaranteed.

The present invention discloses a high-work efficiency wide-width folding type multifunctional water direct sowing machine. The machine comprises a frame. A middle sowing box is arranged on the lower end of the frame. A left sowing box and a right sowing box are symmetrically arranged on both sides of the middle sowing box by connection pins. A left hydraulic cylinder and a right hydraulic cylinder are symmetrically arranged on both sides of the upper end of the frame. A piston rod of the left hydraulic cylinder is connected with the upper end of the left sowing box. A piston rod of the right hydraulic cylinder is connected with the upper end of the right sowing box. A pair of support wheels is arranged on the front ends of the left sowing box and the right sowing box by supports. A pair of power ground wheels is arranged on the rear end of the frame by ground wheel supports.

The invention relates to the technical field of municipal equipment, and discloses a buoyancy type self-cleaning flood gate for an underground garage. The buoyancy type self-cleaning flood gate comprises a door frame, a floating gate body, a buoyancy cavity and a flood discharge cavity. The door frame is movably connected with the floating gate body, the floating gate body is arranged in the buoyancy cavity, and the buoyancy cavity communicates with the flood discharge cavity. According to the buoyancy type self-cleaning flood gate for the underground garage, when there is a light rain and water flow is relatively slow, the buoyancy cavity is a closed space, and a sediment accumulation phenomenon cannot occur. When there is a heavy rain, the floating gate body is triggered to stretch out to block water, one-time high-pressure water column cleaning can occur, so that less silt is accumulated at the bottom of the buoyancy cavity all the time, and it is ensured that the floating gate bodycan stretch out and draw back normally so as to guarantee normal passing of a vehicle. In addition, an inflation air bag carries out sealing protection on the top of the floating gate body, the siltand garbage are prevented from blocking the floating gate body, the force effect of the vehicle on the floating gate body is reduced, and location deformation of the floating gate body is reduced.

The invention discloses an intelligent traffic light controller based on video vehicle queue length detection and a control method thereof, and provides a traffic light controller and method which are low in cost and can adjust traffic light time intervals automatically in various types of road junctions according to vehicle queue waiting condition on the road surface. Besides, road waiting vehicle queue length detection is performed by virtue of existing road cameras and a video analysis technology, and the traffic light time intervals are adjusted dynamically according to detection results of multiple waiting lanes. During construction, all that is needed is to mount a small-size control box on each road junction, the mounting cost is reduced greatly, and the construction scale is reduced; the controller and the method have wider application; and the duration of the traffic lights can be automatically controlled according to the vehicle queue length of each waiting lane in real time, manual adjustment is not needed, the road passage efficiency can be improved effectively, the traffic jam condition of crossroads can be relieved, and the normal passage of vehicles and pedestrians is guaranteed.

The invention provides a suspension bridge superstructure demolition and replacement installation method. The suspension bridge superstructure demolition and replacement installation method comprises the following steps: a. erecting a trestle in parallel with a suspension bridge on the outer side of the suspension bridge, wherein the two ends of the trestle are connected with bridge approaches at the two ends of the corresponding suspension bridge; b. inspecting anchorages at the two ends of the suspension bridge and making sure that the anchorages are in a normal working state; c. demolishing original stiffening girders at an upper portion of the suspension bridge section by section; d. demolishing original suspenders and original cable clamps corresponding to the original stiffening girders; e. lifting a main cable through a crawler crane to realize the demolition of the original main cable at the upper portion of the suspension bridge; f. lifting a new main cable through the crawler crane to realize installation; g. installing new cable clamps and new suspenders at corresponding positions through surveying and setting-out; h. lifting each new stiffening girder section to a designated position by section through the crawler crane, and after all new stiffening girder sections are completely installed, connecting all sections to form an integral body. The suspension bridge superstructure demolition and replacement installation method shortens the demolition and replacement construction period of the suspension bridge superstructure to the utmost extent, and reduces the negative influence caused by the demolition and replacement of the suspension bridge superstructure.

The invention discloses anti-skid cement mortar for a tunnel pavement and a preparation method thereof. The anti-skid cement mortar is prepared from the following components in percentage by weight: 26-36 parts of cement, 48-58 parts of sands, 8-18 parts of polymers, 3-10 parts of water, 0.03-0.07 part of a water reducer, 0.01-0.04 part of a defoamer and 0.01-0.06 part of a stabilizer. The preparation method comprises the following steps: weighing the following raw materials in the anti-skid cement mortar in percentage by weight: cement, sand, polymers, water, a water reducer, a defoamer and a stabilizer for later use; pouring cement and sand into a stirring kettle, pre-mixing, and piling up; adding water into a cement-sand mixture pit, stirring, and then pilling the mixture up again; adding a polymer emulsion into the mixture pit, mechanically stirring and piling the mixture up; and slowly adding the water reducer, the defoamer and the stabilizer, respectively, and uniformly stirring to prepare the anti-skid cement mortar. The anti-skid cement mortar disclosed by the invention is good in peaceability and high in early strength and can be used for effectively improving the anti-skid performance of the pavement.

The invention discloses a road condition intelligent video monitoring method and system, and the method comprises the steps: obtaining a road passing vehicle scene video, carrying out the recognition and analysis of the passing vehicle video based on a deep learning neural network, and carrying out the real-time analysis and collection of vehicle data; the method comprises the following steps: identifying scene videos of vehicles passing the road obtained at different places of the same road section, and determining and counting the ID number of vehicles passing the area within a fixed time interval to obtain vehicle flow and vehicle speed results; and deducing the road condition to a big data platform by using the obtained vehicle flow and vehicle speed results, and carrying out early warning decision making. According to the road condition intelligent video monitoring method and system, real-time intelligent video monitoring is carried out on the road condition through the deep learning neural network, the traffic condition, behaviors and personnel violating the safety specification are found in time, an alarm is automatically sent and uploaded to the rear-end traffic platform, the rear-end traffic platform notifies related workers to immediately process, and the road traffic safety is ensured.

The invention discloses an urban bridge rapid demolition and reconstruction construction method based on a gantry crane, and belongs to the field of bridge engineering. The method comprises the steps that S1, an auxiliary road bridge is constructed, and traffic is guided and changed to the auxiliary road bridge; S2, a main bridge gantry crane is erected; S3, a bridge dismantling bracket is erected; S4, an arch rib support is erected; S5, an accessory structure and a bridge deck system of the old bridge are detached; S6, a rope saw is adopted for cutting the bridge flange plate and hoisting away the bridge flange plate; S7, after the suspender is dismantled, the suspender is transported out of the construction site; S8, arch ribs are cut and hoisted away in a segmented mode through a gantry crane; S9, the main beam is cut, decomposed and hoisted away in a segmented mode through a gantry crane; and S10, the old pier platform steel sheet pile cofferdam is constructed and decomposition and hoisting are performed on a lower structure; according to the rapid dismantling and reconstruction method, ecological dismantling of an old bridge and rapid erection of a new bridge are achieved through repeated utilization of the bridge dismantling gantry crane, the requirements of navigation limitation and environmental protection are met, and normal traffic of urban trunk traffic is guaranteed.

The invention discloses a VTEP (Virtual eXtensible Local Area Network Tunnel End Point)-based routing table maintenance method and device. The method includes: monitoring whether first quantity of hardware routing entries included by a hardware routing table reaches maximum capacity, and if the maximum capacity is not reached, selecting a software routing entry from a software routing table to addthe same into the hardware routing table; monitoring whether each hardware routing entry is hit in an aging period, updating a continuous not-hit period and a first hit identifier of each hardware routing entry, and deleting hardware routing entries, of which continuous not-hit periods exceed a first set threshold, in the hardware routing table and corresponding software routing entries thereof in the software routing table; and monitoring whether each software routing entry is hit in the aging period, updating a continuous not-hit period and a second hit identifier of each software routing entry, and deleting software routing entries, of which continuous not-hit periods exceed a second set threshold, in the software routing table. The solution can better maintain the hardware routing table and the software routing table.

The invention discloses a construction method for making a prestressed back for box-culvert jacking. The construction method is characterized by comprising the steps as follows: preparing the prestressed back according to the maximum jacking force required for box-culvert jacking on one side of a sliding plate; burying a plurality of prestressed steel strands in the prestressed back and the sliding plate; stressing the prestressed steel strands to form a whole structure; prefabricating a box culvert on the sliding plate; and jacking the box culvert through a jack. According to the construction method, under the circumstance that a natural back is inexistent or the natural back cannot provide an enough box-culvert jacking force, the prestressed back is fabricated to provide the jacking force required for box-culvert jacking so as to finish the box-culvert jacking construction; the ground damage degree is small, the traffic is not influenced, the vehicles on the ground are guaranteed to run smoothly, and the traffic pressure is relieved; and noise and environmental pollution cannot be caused in the construction process, less construction equipment is used, the construction method is simple, economic and reasonable, the jacking construction can be carried out in winter without weather influence, the jacking distance is longer, and the construction safety is high.

The invention discloses a highway and railway dual-purpose vehicle capable of fast getting up and down lanes. The cab of the vehicle is located on the top surface of the frame, the powertrain is mounted on the frame and drives the vehicle through the control of the cab, a hydraulic suspension wheel is arranged on the bottom surface of the vehicle frame and drives the vehicle frame to be lifted andlowered through a hydraulic cylinder, a hydraulic suspension wheel drives the wheel to rotate by a driving motor, a steel wheel set is provided with a driving motor and is arranged on the bottom surface of the vehicle frame, a cargo box is arranged on the top surface of the vehicle frame, a hydraulic leg assembly is arranged on the bottom surface of the vehicle frame at intervals, and left-righttranslation of the vehicle frame is realized by vertical lifting and lowering of the legs and expansion and contraction of the legs on the same side. The invention overcomes the shortcomings of the inconvenience of the traditional traction rail car, effectively improves the construction operation efficiency, reduces the construction and equipment cost, reduces the equipment investment, and ensuresthe normal passage of the rail car.

The invention relates to the field of bridge construction, in particular to a construction method for erecting prefabricated box girders through a walking type bridge girder erection machine. The method includes the steps that the prefabricated box girders transported through a girder transporting vehicle are lifted at the rear end of the bridge girder erection machine; components such as front and rear supporting legs and middle and rear carrying wheels of the bridge girder erection machine are adjusted; the bridge girder erection machine is pushed to move forwards when the weight of the bridge girder erection machine is kept balanced; the front supporting legs of the bridge girder erection machine are moved to a pier cover beam to be erected and stridden at the front position, the rear supporting legs support the top faces of the font ends of the erected box girders, and therefore a hole passing purpose is achieved; and then a girder transporting crane on the bridge girder erection machine is used for lifting the box girders. By the adoption of the construction method, the defects that a crane needs to be repeatedly erected and moved, the construction efficiency is low, and the risk coefficient is high are overcome. A construction period can be guaranteed, normal construction and vehicle passage of a road under a bridge are guaranteed as well, meanwhile, the construction cost is reduced, the safety coefficient is high, social benefits and economic benefits are good, the method is suitable for being applied to urban prefabricated box girder lifting projects and particularly suitable for lifting of the relatively high prefabricated box girders of the bridge over water.