330results about How to "Improve engineering efficiency" patented technology

According to the present invention, a steel structure integral hoisting method based on BIM comprises: calculating member deflection by using BIM software, determining an arching degree of a single truss, checking member deflection in construction, comparing the member deflection in construction with a pre-arching degree, and comparing a deflection degree after loading that follows completion of construction with designed control deflection degree requirements; using an MIDAS finite element analysis plug-in to set hoisting points at intersection of an upper chord and a diagonal web member on the truss and on each truss, performing design calculations of lifting lugs, and analyzing displacement of structurally critical nodes; performing manual or automatic layout on the integral steel truss, steel tubes and steel cables in a venue model, performing integral analysis on the steel truss of the steel structure, calculating pre-stress of each node of the integral structure by using the BIM software; finally, virtually adding an environment and roads of a construction site by using the BIM software, completing stimulation of a whole erection process, determining the installation time and the situation of occupying construction roads of each steel truss, and estimating construction completion time. The present invention solves the construction problem of limited space, reduces the construction cost and shorten the construction period.

The invention discloses an RFID (Radio Frequency Identification Device)-based urban intelligent curb parking system. The RFID-based urban intelligent curb parking system comprises an intelligent curb parking system cloud service background, an automobile and a parking space, wherein the intelligent curb parking system cloud service background is connected with a mobile phone inside the automobile and a parking terminal through a 3G wireless signal or a 4G wireless signal respectively; the parking terminal is connected with an RFID card on the parking space through a radio frequency wireless signal and comprises a main control CPU (Central Processing Unit) small system module, a GPS (Global Positioning System) module, a vehicle-mounted ETC (Electronic Toll Collection) system module, a wireless communication module, an RFID radio frequency transmitting and receiving module and a power module; the GPS module, the vehicle-mounted ETC system module, the wireless communication module, the RFID radio frequency transmitting and receiving module and the power module are connected with the main control CPU small system module through signal lines respectively. The RFID-based urban intelligent curb parking system is simple in structure, more power-saving, low in cost and more convenient to use.

The invention relates to the field of reservoir reinforcement, and specifically belongs to a seeping hidden trouble detection and directional processing method and detection equipment for an earth and rockfill dam. Aiming at a problem that most of earth and rockfill dams in current water conservancy engineering have a problem of seepage, the invention provides a directional processing method integrating seepage inspection and seepage blocking. The objectives of the invention lie in judging an electrical property abnormal area of a seeping channel according to the testing result of the resistivity of the earth and rockfill dam, interpreting the specific distribution of hidden troubles through combining the technical data of the operation of the reservoir, carrying out the reasonable guide of subsequent reinforcement operations, optimizing the grouting technology, avoiding the blindness of seeping blocking construction, remarkably improving the project benefit and winning social reputation. The method and equipment are advantageous in that the method and equipment introduce the latest parallel electrical method detection technology into the seepage detection of the earth and rockfill dam, carry out reasonable grouting according to a detection result, achieve the integration of hidden trouble inspection and processing, and achieve a purpose of quick directional processing.

A monitoring and display system for a position and a three-dimensional attitude of a floating and semi-submersible type mobile platform comprises an RTK (real time kinematic) DGPS (differential global position system) positioning module which is used for obtaining positioning data of the mobile platform; a bidirectional gravity type inclinometer module which is used for obtaining longitudinal and transverse inclination data of the mobile platform; a wireless transmission module which is used for transmitting the positioning data and the inclination data to a synchronous collection and processing module; the synchronous collection and processing module which is used for collecting the positioning data and the inclination data synchronously and converting the positioning data into a presupposed type coordinate system; and a real-time three-dimensional animation and information display module which is used for dynamically displaying the position and the three-dimensional attitude of the mobile platform in real time in a three-dimensional simulation mode. By means of the GPS (global position system) and the animated simulation, the monitoring and display system for the position and the three-dimensional attitude of a floating and semi-submersible type mobile platform displays dynamically the position and attitude information of the mobile platform in real time, and has the advantages of being intuitional, efficient and highly-accurate, thereby largely improving the safety in construction and engineering efficiency, and having a high automaticity, an accurate measurement during work process and a wide prospect.

Provided is a multifunctional circulation transport cart. The multifunctional circulation transport cart can perform towing in a narrow formwork support system space in the early-stage wall column or formwork removal process in underground structure construction and also can rapidly classify circulation materials and rapidly tow the circulation materials to a discharging port so that the circulation materials can be transferred out by a tower crane in large-scale formwork removal. The multifunctional circulation transport cart comprises a front wheel assembly and a rear wheel assembly, and the front wheel assembly and the rear wheel assembly are connected together through a length-adjustable positioning frame. By the adoption of the spliced adjustable structure, the front wheel assembly, the rear wheel assembly separated from the front wheel assembly, a front frame and a rear frame separated from the front frame form the transport cart of which the size and width are suitable for the narrow space in early-stage formwork removal of a construction engineering basement. The transport cart can play a great role in construction of the construction engineering underground structure or material clearing, transfer the circulation materials and construction materials in or out more rapidly compared with a traditional method, greatly shorten the time for transferring the circulation materials and the construction materials in basement construction, accelerate the progress of the whole basement engineering, lower the construction cost and improve the construction efficiency.

The invention provides a mineral aggregate gradation optimization method based on the mineral aggregate void rate. The method comprises the following steps that 1, mineral aggregates are screened to obtain classification mineral aggregates of various different grain diameter sizes; 2, the mass of each mineral aggregate obtained in the first step is converted into volume on the basis of the percentage; 3, iterative computation is performed to obtain the void rate of the mixed mineral aggregates; 4, the mineral aggregate gradation is optimized according to the void rate of the mixed aggregates. According to the mineral aggregate gradation optimization method, engineering practice is fully considered, and the mineral aggregate void rate can be reasonably estimated and gradation optimization can be performed on the premise that mixed aggregate test pieces are not compacted in the earlier stage, so that workloads and blindness of the mix proportion design stage are greatly lowered, and the engineering efficiency is remarkably improved.

The invention relates to a block stone-reinforced concrete piling composite groyne bank protection structure, which is used for bank protection in hydraulic engineering and ocean engineering. The block stone-reinforced concrete piling composite groyne bank protection structure consists of reinforced concrete pilings, connecting and tying beams and block stones. When the composite pile type groyne structure ensures the accretion promotion and pond protection effect of the pile type groyne, the goal of reducing the engineering manufacture cost is reached through enlarging the piling space and reducing the consumption of reinforced concrete.

The invention discloses a concrete stand column repairing reinforcing method. The method comprises the following steps that a component at the top of a stand column is supported; concrete at the defected portion of the stand column is chiseled out to the surface of a main rib; a reinforcing steel bar is implanted into the portion where the concrete is chiseled out; according to the longitudinal size of the chiseled portion, a steel hoop cylinder is manufactured and installed; the portion between the steel hoop cylinder and the concrete chiseled surface is filled with IV-type cement-based slurry; when the filled slurry reaches the design strength, prestress is applied to the filled portion. By adopting the method, structure repairing reinforcing can be performed on the concrete stand column, so that the structure performance of the stand column is greatly enhanced, meanwhile, the existing whole structural engineering is not affected, repeated construction caused by completely disassembling the stand column is avoided, the engineering efficiency can be improved, and the engineering cost is saved.

The invention provides a bolt ball welding ball mixed node large span cantilever grid structure construction method. The method comprises the steps that 1 a bolt ball welding ball mixed node space grid cell, namely the size and structure of a middle-size cell grid are determined according to the design; 2 a ground assembly moulding bed is arranged; 3 ground assembling is conducted on the middle-size cell grid; 4 coating and numbering are conducted on the middle-size cell grid; 5 a lifting point of the middle-size cell grid is determined and support profile steel is added; 6 a steel wire rope used for lifting and a chain block are arranged, and trying of lifting is conducted; 7 the middle-size cell grid is lifted and installed. The construction period can be greatly shortened, the using amount of construction revolving materials is reduced, the construction efficiency is improved, the safe hidden trouble brought by high altitude construction of constructors can be reduced at the same time, and meanwhile the special requirements on loading, span, forms and the like of a large-scale building grid structure can be met conveniently.

Movable reaction equipment for a shield launching shaft comprises a girder provided with a rectangular frame, wherein the girder is perpendicularly placed on a track of a launching bracket in the shield launching shaft, and the front side of the girder is connected with a reference steel ring through welding, the back side of the girder is connected with a flange at the front end of a horizontal support tube, a flange at the back end of the horizontal support tube is closely attached to a pushing back wall of the shield launching shaft, the horizontal support tube is formed by flanged connection of one section of steel tube or at least two sections of steel tubes, and the length of each steel tube is smaller than the travel of a shield machine jack; and the front side of an embedded support piece on a bottom plate of the shield launching shaft is in threaded connection with the tail of an anti-reverse jack. The equipment is low in construction cost, simple and convenient to construct, high in construction efficiency, short in construction period and low in risk when being used for performing launching construction of the shield launching shaft.

The invention discloses a modular multilevel converter (MMC) voltage-sharing control method, belonging to the capacitance voltage control technical field. The method comprises: initializing capacitance voltage values of all sub modules in a voltage-sharing controller; collecting the bridge arm current of each phase of a MMC, utilizing the voltage and current relation of capacitors to perform differencing to obtain the capacitance voltage change values of all the sub modules in each control period, and correcting the capacitance voltage of all sub modules in the voltage-sharing controller; collecting a small amount of capacitance voltages to obtain the error between a capacitance voltage storage value in the voltage-sharing controller and a capacitance voltage collection value, and correcting the capacitance voltage of all sub modules in the voltage-sharing controller again. The method realizes MMC voltage-sharing control through collecting bridge arm current and a small amount of capacitance voltages, can avoid real time collection of a great amount of sub module capacitance voltages, and guarantee voltage-sharing control effects, and provides a feasible solution for reducing data traffic in practical voltage-sharing control, and improving engineering efficiency.

The invention discloses a joint for connecting a buckling-restrained brace, a concrete beam and a concrete column; an anchoring part anchored in the concrete beam and the concrete column is composed of two groups of spaced H-shaped profile steels; the H-shaped profile steels and an anchoring plate are welded into a whole one; the internal edge of the anchoring plate id arranged at the external sides of the concrete beam and the concrete column; a joint plate is integrally welded with the anchoring plate; the external end of the anchoring plate integrally welded with the joint plate is lengthened to be longer than the lateral side of the joint plate; and bolt holes for fixing the buckling-restrained brace are formed on the joint plate. The H-shaped profile steels in the joint plate have good stability in a plane and high rigidness and are not easy in instability; the profile steels have big welded areas with the anchoring plate and are not easy to produce pulling / pushing damage; the profile steels have big contact and load-transfer areas with the concrete and are capable of uniformly dispersing the load to the concrete beam; the lengthened parts at two ends of the anchoring plate are capable of effectively avoiding direct extrusion between the joint plate and the concrete, so that the stress concentration is relieved and the service life of the joint is prolonged; the integrality of the concrete beam and the concrete column is not influenced, so that hoops and longitudinal ribs in the concrete beam can be arranged easily; the steel ratio in the joint area of the beam and the column is increased and the strength and rigidness of the joint is improved by the plastic deformation of the beam restrained by the anchoring plate; the whole component can be manufactured in a factory and the construction time is saved.

The invention provides an implementation method and system of a business expansion scheme based on a power grid GIS platform. Visual image geographic information is provided by means of the power grid GIS platform, installation target position information of a user is accurately and quickly determined, a preset search scheme is executed after a search template, corresponding to installation capacity and voltage class information, in business expansion request information is obtained to serve as a current filter condition of power grid equipment, all power grid equipment meeting the current filter conditions is searched out, the power grid equipment and access circuits of the power grid equipment are directly displayed through a display interface of the power grid GSI platform, corresponding configuration information is displayed in the mode that design staff click the power grid equipment and the access circuits of the power grid equipment, and then an economic and efficient power grid equipment access circuit is determined according to the configuration information and the business expansion request information of the user, namely the business expansion scheme meeting preset access conditions is determined, so that engineering efficiency is improved and business expansion cost of the user is reduced.

The invention discloses an RTK algorithm for correcting a tropospheric empirical model by using real test meteorological parameters. The method comprises the following steps: step 1, storing an observation value of a reference station and actually measured meteorological elements of the observation value in real time; 2, selecting a global troposphere empirical model, and calculating zenith troposphere delay; 3, establishing the relationship between evelation, a global empirical model ZTD and a meteorological elements ZTD; 4, correcting the global empirical model ZTD of the reference station and the moving station by using the correction model, and obtaining a reference station observation value correction amount by solving the difference between the two models; and 5, correcting the reference station observation value by utilizing the reference station observation value correction amount, broadcasting the corrected reference observation value to the moving station, and carrying out double-difference RTK calculation by the moving station to obtain a three-dimensional coordinate of the moving station. The method has the advantage that the RTK service positioning precision and reliability are improved. The invention further discloses a continuous operation base station service system suitable for the special environment.

The invention relates to the technical field of the rail construction engineering, in particular to a method for adjusting control benchmark point of a rail by means of approximate adjustment. The method is characterized in that two ends of a point to be determined are added into a known traverse point to form an echoed lead according to a point to be determined of a known point lofting control benchmark point, an actual-measurement corner and side relationship and a theoretical corner and side relationship of the echoed lead are compared, the position of each point to be determined is regulated, so that a point location error of the point to be determined falls within the required range, and therefore, the point to be determined is determined as a control benchmark point. According to the method disclosed by the invention, all control benchmark points are related to form a new rail control lead, manual errors in the lofting process are regulated, the precision of a rail control point is improved so as to improve the accuracy of a rail control benchmark and the rail status quality, so that a train can stably and quickly operate, the method is simple to operate, high in precision and high in engineering efficiency, can be completely applied to the rail traffic engineering construction, and is safe and reliable.

The invention discloses a multi-port multi-mode IoT communication terminal supporting multi-meter combined reading and a reading method thereof. A wireless communication unit and a data acquisition unit of the communication terminal are respectively connected to a data processing unit; a configuration interface is respectively connected to the wireless communication unit, the data processing unitand the data acquisition unit through a configuration unit; one end of an RS485 interface and / or an RS232 interface is connected to the data acquisition unit, and the other end is used for connectinga plurality of meters; the wireless communication unit includes a LoRa wireless communication subunit and / or a NB-IoT wireless communication subunit and / or a WIFI wireless communication subunit and / ora GPRS communication subunit. The terminal has the advantage that different types and different protocols of sensor or meter reading data are connected to a wireless network in different modes quickly by configuring the multi-port multi-mode IoT communication terminal, thereby reducing the research and development cost, improving the transformation efficiency of the old equipment and reducing theconstruction quantity.

The invention discloses a structure and method for installing a perpendicularity sensor on an ultralong tubular pillar. The structure comprises a laser gradiograph, a coarse adjusting bolt assembly, a fine adjusting bolt assembly, a light target, an installing bottom plate, an adjusting plate and a right-angle bent plate, and the perpendicularity sensor and a laser transmitter are arranged in the laser gradiograph. The perpendicularity sensor can measure the included angle between a measuring datum line and a natural vertical line. The laser of the laser transmitter is parallel to the measuring datum line of the perpendicularity sensor. The position of the adjusting plate is adjusted through the coarse adjusting bolt assembly and the fine adjusting bolt assembly so that when the light target is installed on different datum lines, the position of the laser on the laser target cannot be changed, and the laser transmitted after the laser gradiograph is installed and fixed is parallel to the axis of the tubular pillar. The problem of installing and positioning of the perpendicularity sensor on the ultralong tubular pillar is solved, it is ensured that the laser transmitted by the laser gradiograph is parallel to the axis of the tubular pillar, the measuring precision of the laser gradiograph is guaranteed, and the perpendicularity adjusting construction of the tubular pillar is more convenient and accurate.

The invention discloses a tunnel supporting formwork for civil engineering. The tunnel supporting formwork comprises a supporting plate, wherein a supporting column is fixedly connected to the supporting plate; a beam frame is fixedly connected to the supporting column; a base is arranged below the supporting plate; and a first lifting mechanism is arranged between the supporting plate and the base. The tunnel supporting formwork further comprises a frame body positioned above the beam frame, and a second lifting mechanism is arranged between the frame body and the supporting plate or the beamframe. The tunnel supporting formwork for civil engineering aims at solving the problem that in the prior art, a tunnel construction supporting device cannot be adjusted according to the heights of different tunnels, and the purposes that the heights of the different tunnels are adjusted, moving is convenient, the time needed by transferring of constructors is shortened, and the engineering efficiency is improved are achieved.

The invention discloses an intelligent output type vibration monitoring device, a system comprising the device, and a monitoring method, and belongs to the vibration monitoring field. The intelligent output type vibration monitoring device comprises an X-direction vibration acquisition unit; a Y-direction vibration acquisition unit; a monitoring alarming unit connected with the X-direction vibration acquisition unit and the Y-direction vibration acquisition unit. The X-direction vibration acquisition unit comprises an acceleration sensor X1 and an acceleration sensor X2, which are redundant to each other; and a signal acquisition module X connected with the two acceleration sensors. The Y-direction vibration acquisition unit comprises an acceleration sensor Y1 and an acceleration sensor Y2, which are redundant to each other; and a signal acquisition module Y connected with the two acceleration sensors. The monitoring alarming unit is connected with the signal acquisition module X and the signal acquisition module Y, and is used to receive acquisition data transmitted by the signal acquisition module X and the signal acquisition module Y, and is used to give fault alarms of different types according to the acquisition data. A cabin vibration false alarm rate of a wind turbine generator set is effectively reduced.

The invention discloses a detachable autorotation type drilling pipe pile. The detachable autorotation type drilling pipe pile comprises a pipe pile body, a movable joint, a drill rod, and a drill bit, wherein the pipe pile is of a hollow structure; the movable joint is slidably arranged on a traction guide pipe in a sliding mode, the lower end of the movable joint is fixedly connected with a traction wire, and the movable joint is arranged in the pipe pile body and can move up and down in the pipe pile body; the drill rod is fixedly connected with the lower end of the movable joint and located in the pipe pile; the drill bit is arranged at the bottom of the drill rod and is connected with a driving mechanism, and the drill bit is driven to rotate through the driving mechanism; the drill bit comprises a mechanical drill bit body and a plurality of high-pressure water jet nozzles; the multiple high-pressure water jet nozzles are arranged on the mechanical drill bit body; and the multiple high-pressure water jet nozzles are arranged in different inclination directions. According to the detachable autorotation type drilling pipe pile, the problem that it is difficult for the pipe pileto penetrate into a rock stratum during the pile sinking construction process is solved; damage of a pile body caused in the pile sinking process is reduced; the soil plug effect of the pipe pile inthe pile sinking process is reduced; and the construction is convenient and simple and convenient to implement.

The invention relates to a reinforced plate type fire control joint structure for a space structure. Six I-shaped section beams are fixed between an upper joint plate and a lower joint plate. A chuck I is arranged in a female clamping groove at the first layer. A cylinder reinforcement ring II or a prism reinforcement ring II is arranged between the chuck I and the lower joint plate. A pipeline is fixed to one of the I-shaped section beams, and a sprayer head is arranged in an equipment hole II and connected with the pipeline; or, at least one chuck II is arranged in female clamping grooves at all layers between the female clamping groove at the second layer and the female clamping groove at the Nth layer. If one chuck II is adjacent to another chuck II, one cylinder reinforcement ring I or prism reinforcement ring I can be arranged. If the chucks II are adjacent to the upper joint plate, one cylinder reinforcement ring II or prism reinforcement ring II can be arranged. Precasting and connecting of sub-parts are simple, detailed design can be conducted in combination with the stress conditions to improve the bending moment and shearing force transmission capacity, space is reserved for passing of pipes through a non-closed web zone, and due to use of a built-in spraying facility, the service building occasions of an aluminum alloy net shell structure are widened.

The present invention discloses a three-dimensional geological raster body model construction method, and belongs to the field of constructing three-dimensional geological body models. The three-dimensional geological raster body model construction method disclosed by the present invention has a particular procedure that comprises the following ten steps: determining a standard project plane range; rasterizing a standard rectangle region G; calculating an earth-surface triangulation net and an underground triangulation net of the standard rectangle region G; calculating a unit grid calculation line and a grid line of the standard rectangle region G; equidistantly dividing an auxiliary line and the calculation line; calculating geological attributes of discrete points; establishing a correspondence relationship between a calculation point and an auxiliary point; constructing three-dimensional geological raster unit bodies; classifying the unit bodies; and combining the unit bodies according to calculation information and position information of the unit bodies. A space is dispersed into a series of points, and the geological attributes of the points are calculated, and then association between the points is analyzed, and thus spatial geometrical bodies where the discrete points are located are combined, so that an overall geological distribution condition of the space is calculated, and the goals of high precision, little space limitation, high efficiency and strong applicability can be achieved.

A screen generation method of an energy management system according to the present disclosure may include performing system visualization modeling indicating a connection relationship between monitoring facilities in a power system to generate a first screen; generating a file containing information on a connection relationship between facilities used during the first screen generation; and generating a second screen for monitoring facilities during the real-time operation using the generated file.

The invention discloses a decoupling control method for a suspension system of a four-degree-of-freedom magnetic levitation motor, which is divided into a suspension system and a torque system. In thesuspension system, there is electromagnetic coupling between the front displacement x1, y1 and the rear displacement x2, y2 in the radial direction, and the coaxial displacement between x1 and x2, y1and y2 will influence each other, so there is mechanical coupling. In order to solve these two kinds of coupling, the input of the controlled object is the current in the suspension winding, and theoutput is the front and rear displacement of the suspension rotor. Two closed-loop controllers are designed to control the front and rear displacement respectively. The displacement sensor is used todetect the radial displacement of the rotor and the displacement signal is fed back to the closed-loop controller. Electromagnetic decoupling controller is constructed to solve the electromagnetic coupling between the front and rear sides of the rotor, and mechanical decoupling controller is constructed to output compensation current to the suspension winding to solve the mechanical coupling.

The invention relates to a multi-pipeline connecting flange which comprises a first flange body, a second flange body, a sealing gasket, fastening bolts and nuts. The sealing gasket is arranged between the first flange body and the second flange body. The corresponding positions of the first flange body and the second flange body are each provided with at least two pipe containing holes and are further each provided with at least two fastening through holes. The fastening bolts sequentially penetrate the fastening through holes of the first flange body and the fastening through holes of the second flange body to be in threaded connection with the nuts. According to the multi-pipeline connecting flange, due to the fact that the corresponding positions of the first flange body and the second flange body are each provided with the at least two pipe containing holes, multiple pipelines can be connected at the same time, the engineering efficiency is greatly improved, manpower and material resources are saved, and the construction progress is accelerated.

The invention relates to a diversion blasting construction method of an intertidal zone blasting displacement bank. The method comprises the following steps: (1) dumping filling a bank body according to a design and construction scheme; (2) calculating for blasting operation design; (3) reserving a silt pack bulged on the head end of the bank, and utilizing the silt pack as one part of an upper overburden load; (4) extracting and guiding water on the periphery of the silt pack into a V-shaped channel; (5) embedding explosive, and detonating; (6) continuously throwing stones, and stopping the throwing of stones in a sliding manner after reaching the balance; (7) throwing filling stones of the needed quantity for the next blasting operation on the bank end, continuously throwing filling stones behind the bank end until the structural balance of the bank body reaches the designed standard height, and arranging a slope by utilizing a construction machine; (8) preparing the next blasting, and thus cycling. By adopting the method, the construction progress of the intertidal zone blasting displacement bank can be accelerated, the engineering cost is reduced, the blasting and displacement bottoming effect is good, the construction process is simple, the tidal establishment operation is not needed, the explosive is more convenient to bury, the construction process has an important significance on guaranteeing the construction quality and accelerating the construction process, and the popularization value is remarkable.

The invention relates to an existing building multi-objective optimization transformation decision-making method based on a GAR-BF algorithm, and the method comprises the following steps: taking the simultaneous minimization of refrigeration energy consumption, thermal comfort and transformation cost as an existing building transformation optimization objective, constructing an objective function,determining the type and number P of decision variables of the existing building multi-objective optimization transformation; determining an optimization interval of each decision variable; determining a reference building and designing an orthogonal table; establishing an existing building performance simulation RBF neural network model; carrying out multi-objective optimization calculation by utilizing an NSGA II algorithm, calling the RBF neural network model by the NSGA II algorithm in each iteration to obtain an output vector matrix so as to update a population of the next iteration, realizing dynamic coupling of the RBF neural network model and the NSGA II algorithm, and obtaining a Pareto optimal solution set; and carrying out statistical analysis on the calculated Pareto optimal solution set to obtain the distribution condition of decision variables, so that the required optimal transformation measures are obtained. Efficiency of actual engineering is improved.

The invention discloses a process for refitting a rudder blade of a ship. The process comprises operating steps of removing an old rudder blade and mounting a new rudder blade. According to the process for refitting the rudder blade of the ship, when the rudder blade of the ship is refit, the rudder plate is constructed onsite under the circumstance of not removing the rudder blade in a dock, so that the engineering efficiency can be improved effectively, the dock period is shortened and the economical benefit is improved. Meanwhile, the positional deviation of the new rudder blade after construction is within a specified scope by adopting reasonable and effective construction flows and positioning precision control measures. The refit new rudder blade is linearly smooth and attractive inappearance as a whole. Via actual production application, the refitting process is practicable in construction scheme, controls the quality and precision well, and lays a good foundation for follow-uptwin rudder refitting engineering of same type ship.

The invention provides a construction traffic plan optimizing method in dam project construction process. The construction traffic plan optimizing method comprises the following steps of S1, accordingto a trunk road plan of a dam project, establishing parameters of a construction trunk road network, and setting information of each road; S2, adding the information of a dam climbing traffic accessing point in the modeling of the dam project, and a material conveying traffic accessing point in the modeling of raw materials of a material yard; S3, according to the data of the accessing points, setting the number of vehicles, transportation capacity, and material transportation time, so as to establish a traffic transportation data model. The construction traffic plan optimizing method has theadvantages that according to the applicable construction traffic parameters, the accurate and efficient modeling is performed, the construction period is shortened, and the efficiency of the dam project is improved.

The invention discloses a high-precision analog to digital conversion method and device based on a double-path combination analog to digital converter. The method includes the following steps that an original digital signal is separated into a precision loss part signal and a precision retention part signal, the precision loss part signal is amplified by appointed times and then transmitted to a low channel of the double-path combination analog to digital converter, and the precision retention part signal is output to a high channel of the double-path combination analog to digital converter; a preset threshold value is larger than the resolution ratio of the double-path combination analogy to digital converter; an analog signal output by the low channel of the double-path combination digital-analog converter is shrunk by appointed times, then summation is performed on an analog signal output by the high channel of the double-path analog to digital, and then the analog signal is output; the device comprises a signal separating unit, an amplifying unit, the double-path analog to digital to digital converter and a weighting and summing circuit. The high-precision digital-analog conversion method and device have the advantages of being in conversion precision, easy to achieve, reliable in conversion, low in implementation cost and low in requirement for the digital-to-analog converter.