171results about How to "Guaranteed Build Quality" patented technology

The invention provides a deep adversarial diagnosis method for a fan bearing fault under a non-equilibrium small sample scene. The deep adversarial diagnosis method is characterized by comprising thefollowing steps of acquiring wind turbine bearing vibration signals, building an improved AC-GAN (Generative Adversarial Networks) model, building an improved AC-GAN sample, generating a wind turbinebearing vibration signal sample, and diagnosing wind turbine bearing faults under various scenes. The deep adversarial diagnosis method solves the problems of complex vibration signal noise interferences, fewer fault samples, and unbalanced number of samples between categories in the fan fault diagnosis based on the vibration signals, improves the fault identification accuracy under a small samplenon-equilibrium scene, has good fault identification accuracy under complex scenes such as high noise interferences, insufficient number of samples and nonequilibrium of different types of sample training set scales, has the advantages of being scientific and reasonable, strong in adaptability, high in practical value, and can provide references for fan research and development, wind farm operation and maintenance, wind turbine research and other related personnel.

The invention relates to an irradiation and installation method of a ship rudder system, which comprises the following steps: (1)the irradiation of a rubber system; (2)the borings of the rubber system; (3) the location of a rubber bearing base; (4)the installation of a rubber set; (5)the clutchless-shifting of rudder blades; (6)the installation of a rubber stock; (7)the installation of a rubber bearing; (8) the hydraulic fastening of a rubber stock screw cap; (9)the installation of a rubber handle; (10)the installation of the anti-skip block of the rubber blades, gap submission and examination of a full rubber. By using the method of the invention, construction must be fulfilled according to maps at the construction field of the ship building to guarantee the precision of the installation and avoids the waste of human and material resources caused by the installation failure of related components of the rubber system.

A modular design method for building all units and assembling them together includes such steps as 3D modeling of ship body, 3D arrangement modeling for assembling, dividing it into functional or regional units or modules, providing the interfaces between units or modules, designing and drawing them, and integrating them together in frame mode while preserving the interfaces between them.

The invention discloses a ship segment construction precision control method based on the digital twin. The ship segment construction precision control method comprises the following steps of 1) constructing a ship segment digital twin body; 2) collecting sensory data of ship segments in the construction process, sending the sensory data to the digital twin body, and conducting updating; 3) fusingthe sensory data with technology information in the construction process to form twin data, and calculating the segment accuracy of all ship segments; 4) calculating a deviation between the total accuracy in the actual construction process and the accuracy in the theoretical construction process; 5) conducting accuracy compensation according to the above deviation; and 6) judging whether the accuracy requirement is met or not. By utilizing the digital twin technology, a segmented digital twin model of the ship segment construction process is constructed, real-time simulation and monitoring ofthe ship segment construction process are achieved, the problem about synergy between the technology and the accuracy in the ship segment construction process is well solved, and the quality of shipsegment construction is improved.

The invention discloses full-automatic concrete mixing equipment capable of realizing proportioning. The full-automatic concrete mixing equipment is characterized in that a bottom frame is fixedly connected to the bottom end of a mixing drum, a discharging opening is fixedly connected to the position, corresponding to the top of the bottom frame, of the outer end of the mixing drum, a gravel feeding mechanism is fixedly connected to one side of the top end of the mixing drum, the other side of the top end of the mixing drum is fixedly connected with a cement feeding mechanism, the side edge ofthe outer end of the mixing drum is fixedly connected with a water control mechanism, and a stirring mechanism is embedded inside the mixing drum. The equipment is scientific and reasonable in structure and safe and convenient to use; the gravel feeding mechanism is arranged, a rotating motor drives first rotating rods to rotate, and through cooperation of transmission gears, two first rotating rods drive two rough grinding rollers to rotate together to crush gravel, and meanwhile, through belt transmission, the two first rotating rods drive the two second rotating rods to rotate together, sothat the two fine grinding rollers are driven to rotate, and the gravel and cement mixing effect is improved.

The invention discloses a 3D printing reinforcement masonry shear wall structure and a construction method thereof. The construction method includes the following steps that a, the 3D printing technology is used for manufacturing a first layer of masonry outer shell to the pre-buried elevation position of transverse reinforcement; b, the transverse reinforcement is arranged on the top of the first layer of masonry outer shell; c, the 3D printing technology is used for manufacturing a second layer of masonry outer shell on the top of the first layer of masonry outer shell, and thus the transverse reinforcement can be laid in the masonry outer shell; d, the step b and the step c are executed repeatedly, so that the masonry outer shell is obtained; e, the step a and the step d are executed repeatedly, so that a plurality of masonry outer shells are obtained, and the masonry outer shells are stacked to the designed elevation of a shear wall; f, vertical reinforcement is mounted in each masonry outer shell; g, concrete is poured, and accordingly the shear wall can be constructed. By the adoption of the 3D printing technology, the masonry outer shells of reinforcement masonry can be integrally formed, original concrete small hollow blocks are replaced, the site construction labor force is greatly reduced, the construction procedures are omitted, the building quality is guaranteed, and thus building industrialization can be facilitated.

The invention belongs to grouting devices behind cast-in-place concrete piles, and discloses a pile body longitudinal multipoint grouting device. The device can be widely applied to pile foundations adopted by building pressure bearing or extraction resisting. The device is provided with a grouting guide pipe extending from the ground to a pile end, guide pipe side wall grouting holes and a controllable grouting core pipe which can move vertically and be inserted into the guide pipe. According to the device, grouting is achieved on pile side grouting devices with different elevations at the pile end and the guide pipe, pile body grouting is more uniform, the effect is more reliable, and building quality can be guaranteed conveniently.

The invention discloses a semi-automatic piling and building method for a building. The building is built by piling and building blocks, steel pipes, concrete floor slabs and concrete, wherein the building blocks are in more than more shape and specification. The semi-automatic piling and building method is realized on the basis of a robot assembling assembly capable of realizing moving positioning and combination multiplexing, wherein the robot assembling assembly is formed by matching a slide rail, a PLC (Programmable Logic Controller) program-controlled ascending and descending slide table, a mechanical arm, an elevator, a row-hole type positioning block, an automobile screwing device and a concrete stirring grouting device. By adopting a robot operation mode, each step in the piling and building process is highly consistent, and the problem that the building quality is difficult to ensure due to manual operation is avoided. Meanwhile, the high-precision and low-labor semi-automatic piling and building can be realized only through reasonably compiling PLC programs according to the actual sizes of the building blocks, the actual scale of the building, the wall surface shape and the like. The building quality is ensured, and meanwhile, the required construction period of the building is also greatly shortened.

The invention discloses a device and a method for generating a silicon nitride film. The device comprises a first pipeline for introducing dichlorosilane (DCS), a second pipeline for introducing ammonia (NH3), a third pipeline communicated with the first pipeline, and a low-pressure chemical vapor deposition (LPCVD) reaction cavity, wherein the first pipeline and the second pipeline are respectively connected with the LPCVD reaction cavity; and the third pipeline is used for introducing a first gas capable of discharging the residual DCS gas in the first pipeline to the LPCVD reaction cavity into the first pipeline after the DCS gas is stopped to be introduced into the LPCVD reaction cavity. The device and the method for generating the silicon nitride film can timely discharge the residual DCS gas in the first pipeline after the LPCVD reaction is ended, avoid the problem that the residual DCS gas in the first pipeline is condensed to enter the LPCVD reaction cavity to form granules attached to the surface of a wafer, and guarantee the quality of the generated silicon nitride film on the surface of the wafer.

The invention relates to a microorganism aerosol sampling device which comprises a microorganism solution atomization generation device, a compressed air gasification device, a microorganism aerosol generation device and a sampling vessel, wherein the microorganism solution atomization generation device is connected and mixed with the compressed air gasification device and then connected with the front end of the microorganism aerosol generation device; the sampling vessel is connected onto the tail end of the microorganism aerosol generation device. According to the invention, the microorganism solution atomization generation device, the compressed air gasification device, the microorganism aerosol generation device and the sampling vessel are adopted, and through arrangement of quincuncial spraying holes and refining spray nozzles, the generation quality of microorganism aerosol is ensured; through arrangement of a boosting cylinder, a primary filter cartridge and a pressure stabilization cylinder, the quality and precision of air obtained through compression of the compressed air gasification device are ensured, and the generation quality of microorganism aerosol is further ensured; a sampling film and normal saline are adopted for sampling, so that the sampling quality and sampling rate are ensured, and the sampling capacity is improved.

The invention discloses a wiki semantic matching-based document classification method and system. The method comprises the following steps of (1) obtaining a keyword set of a text document by utilizing keyword matching for each text document D in a document set, and performing matching in a wiki semantic reference space by utilizing a matching rule to obtain a reference concept set related to the text documents; (2) generating keyword vectors of the text document according to the keyword set of the text document, and generating concept vectors of the text document according to the keyword vectors and the reference concept set of the text document; (3) calculating comprehensive similarity between any two text documents in a plurality of to-be-classified text document sets according to the concept vectors and the keyword vectors; and (4) performing classification according to the comprehensive similarity between the any two text documents. The system comprises a first module, a second module, a third module and a fourth module. According to the method and the system, the contradiction between validity and high efficiency confronted by a wiki semantic matching method is overcome and an efficient online document classification method is provided.

The invention discloses an integral modular structure of an industrial furnace and a construction method. The integral modular structure comprises a main body part and accessory equipment and accessories. The main body part of the integral modular structure of the industrial furnace comprises a radiation section modular structure, a convection segment, a radiation furnace pipe, a crossing pipe for connecting a convection furnace pipe with the radiation furnace pipe and a supporting hanging system for the radiation furnace pipe and the crossing pipe. The accessory equipment and accessories comprise a chimney, a waste heat boiler, a steam pocket, a draught fan, an ash ejector, parts of platform and ladder, an instrument and a cable of the instrument. The method comprises the steps that the main body part of an integral module of the industrial furnace and the accessory equipment and accessories of the integral module of the industrial furnace are manufactured and assembled in a workshop, integrally transported and integrally mounted to be in place. Integral modular design, workshop modular manufacturing, integral assembly, integral transportation and field integral mounting to be in place are adopted in the industrial furnace; the construction difficulty is reduced, the manufacturing precision and the construction schedule are ensured, the labor cost of site operation is low, the construction period is short, and construction is safe.

The invention relates to a method for detecting the mechanical performance of shale perforated brick masonry, and the steps are as follows: (1) difference grouping is carried out according to different brick types, brick body strengths and masonry mortar strengths; (2) the loading surfaces of all test pieces are leveled by 1:3 cement mortar before test, and the leveling layer is 10mm; the flatness is checked, and the maintenance lasts three days; (3) axle center compression test is carried out in a 2,000KN pressure test machine; (4) steel plates with the thickness being 50mm are cushioned at the upper end and the lower end of a center compression test piece, and hydraulic loading speed is controlled around 0.3-0.5Mpa / s; (5) a cleavage test and a bending tension test are finished on a 250KN vertical load frame by adopting an oil jack, a pressure sensor and a load indicator; (6) a right-angle load framework welded by steel plates is applied in a principal tensile stress cleavage test. The detection method can precisely detect the mechanical performance of the shale perforated brick masonry, thus providing mechanical parameters for shale perforated brick masonries used in building, and ensuring the building quality.

The invention relates to a pile fixing frame structure constructing process. The pile fixing frame structure constructing process comprises the following processes: blanking and cutting, assembling, rolling a cylinder, welding, prefabricating jig frames, scribing and controlling overall construction precision, constructing a gear rack lifting area structure, performing segmented assembling constructing on a pile fixing frame, and machining the pile fixing frame. The pile fixing frame structure constructing process has the advantages that the constructing process disclosed by the invention is realized through blanking and cutting, assembling, rolling the cylinder, welding, prefabricating the jig frames, scribing and controlling overall construction precision, constructing the gear rack lifting area structure, performing segmented assembling constructing on the pile fixing frame and machining the pile fixing frame in a constructing process of the pile fixing frame; and the construction is reasonable and accurate, rework is avoided, and the segmented making precision of the pile fixing frame is controlled, so that the construction quality is ensured.

The invention discloses a method and a system for quickly constructing a special topic landing page, and relates to the technical field of landing page construction. The method comprises the following steps: initializing an operation page; obtaining historical landing page data, if the historical landing page data succeeds in being obtained, displaying the page of the historical landing page in the operation page, loading the container module and the component module of the historical landing page in the displayed page, and displaying a blank page in the operation page; then, loading the container module and the component module required by current construction in the current display page, triggering the processing event of a corresponding module when a user clicks the container module or the component module in the page, rendering the editable attribute state of a clicked part, and storing the data subjected to a rendering operation; and according to the stored data, generating the preview page of the landing page which is constructed at present. By use of the method, the special topic landing page can be quickly constructed, manpower and material resource cost is reduced, construction efficiency is high, and the quality of the landing page is good.

The invention discloses a complete set of tunnel mechanical equipment, which specifically refers to an excavation trolley (or an excavation gantry), a drainage and steel bar binding trolley, a liningtrolley, a spray maintenance trolley, a ditch cable trough trolley, an inverted arch self-propelled hydraulic trestle and a wet spray manipulator, referred to as five trolleys, one trestle and one wetspray machine. A construction organization method matched with the complete set of mechanical equipment comprises the following construction organization steps: S1, hole excavation; S2, initial support; S3, inverted arch lining; S4, arched wall lining; S5, ditch cable troughs and the complete set of mechanical equipment. The construction organization method is reasonable, effectively improves tunnel management effect, improves construction operation environment, ensures construction safety and quality, improves construction progress and is worthy of promotion.

The invention discloses a detector for a prestressed pipeline. The detector mainly comprises a pipeline probe car (1) provided with a camera. The camera is a camera device for shooting pictures in the pipeline, and the pipeline probe car (1) moves in the pipeline for shooting the pictures in the pipeline. The pipeline probe car (1) comprises a cylinder (11) and an end cap (12) for sealing an open end of the cylinder (11), a cylindrical structure with an open end and a cavity inside is formed, and a plurality of retractable car wheels (2) arranged in order are further disposed outside the cylinder (1). The retractable car wheels have moderate retractility, so car jamming doesn't happen even if bends exist inside the pipeline. Meanwhile, by the aid of the detector for the prestressed pipeline, deforming condition of ducts inside the pipeline can be discovered timely, and engineers can timely analyze and accurately judge the inside condition of the pipeline according to images returned from the inside high-pixel camera.

The invention relates to a method for splicing and connecting precast reinforced concrete floor slabs within a span, and belongs to the field of construction method of precast reinforced concrete overlapped floor slabs for buildings. The method comprises the following steps of: firstly, installing reserved plate bottom steel bars and plate bottom steel bars of the floor slabs in a floor slab component, of which the steel bars at the ends are reserved outside the floor slab component, and each steel bar of the reserved plate bottom steel bars of the floor slab is provided with a vertical hook; secondly, fastening and connecting the reserved plate bottom steel bars of the floor slabs, the vertical hooks and late cast concrete with plate bottom steel bars through metal binding wires, and then screwing a spiral steel wire cover at the fastening joint of the metal binding wires; thirdly, fixing the spiral steel wire cover at the fastening joint of the metal binding wires by overlapping the late cast concrete; and fourthly, repeating the above steps through longitudinal plate bottom steel bars of the floor slabs so as to realize longitudinal connection of slab components. According to the method, the overlapped precast reinforced concrete floor slabs are simple to manufacture and simple in construction technology, the quality is easily ensured, the production and transportation efficiency is improved, the building construction quality can be ensured, and the construction cost is reduced.

The invention discloses an embedded pipe for sampling a pile tip of a filling pile, which belongs to the field of in-situ concrete filling piles for fixing building foundations. Coaxial sleeves of the embedded pipe are pasted on the inner side of a steel reinforcement cage of the filling pile; the internal diameter of the embedded pipe is no less than the diameter of a drill bit of a core drilling and sampling machine; a top elevation of the embedded pipe is the same as that of the steel reinforcement cage; a bottom elevation of the embedded pipe is higher than the end elevation of the filling pile; and the two ends of the embedded pipe are blocked off. According to the embedded pipe, core drilling equipment can conveniently penetrate through a pile body through the embedded pipe to directly drill and obtain a pile tip core sample and a bearing course rock soil core sample; the concrete quality at the pile tip, the sediment condition and the supporting course condition can be evaluated; and detection modes and data are enriched, so that the building quality can be better ensured.

The invention discloses a device and a method for multi-metal component online polargrafic detection of complex feed liquid in the wet-process metallurgy process and aims to provide an online polargrafic detection device for metallurgical industrial sites. The device comprises an automatic dropping-mercury quick lifting device, a pressure difference liquid level measuring device, a spiral hose connector and an automatic cleaning detection tank. When the online polargrafic detection device and the online polargrafic detection method are used, a mercury storage bottle can be lifted / dropped quickly, accurately and stably to ensure that the height of a liquid level, which is lifted every time, of a mercury surface of the mercury storage bottle is consistent; the spiral hose connector is durable, and the detection tank can realize the automatic filling and cleaning of the feed liquid; the quick online automatic detection of multiple metal components is realized, real-time and accurate information is provided for the optimization and control of the operating process, and the energy conservation, consumption reduction and emission reduction in the wet-process metallurgy process are promoted powerfully, so the online polargrafic detection device and the online polargrafic detection method have a great significance for the improvement of comprehensive automation level of enterprise production and the enhancement of international competitive power.

The invention discloses a method for carrying out pile leg connection by utilizing a 3000t floating crane. The method comprises the following steps: carrying out water drilling on a pile below an offshore self-elevating type drilling platform, and pre-joining two truss type pile leg sections on a slipway to form a total section (with height being about 70 cm, triangle edge length being 13 m, and total height being about 550 t); then, assembling a rope and a rig for hoisting; and finally, utilizing a secondary hook (with safety load being 750t) of the 3000t floating crane to hoist the pile leg total section to a trunk of the drilling platform from the slipway, positioning the floating crane by utilizing a tug and a rope, carrying out butt-welding on the lower end of the pile leg total section and the top end of the front pile leg section, and dismounting a hoisting tool until the total section is firmly welded. The method for carrying out pile leg connection disclosed by the invention can effectively reduce operations such as high-altitude put-up, welding, transporting and the like of pile leg connection, and is carried out at a height of about 100m from the ground; meanwhile, the hoisting times of the floating crane are halved; hoisting points are reasonably arranged, so that the pile leg total section is uniform in stress; and the method not only can guarantee the safe operation, but also can greatly reduce the production cost and can guarantee the construction quality of a pile leg.

The invention discloses a fully prefabricated cable channel, which comprises a spliced ​​multi-section prefabricated cable trench, and prefabricated joint wells and prefabricated working wells are arranged at intervals between the multi-section prefabricated cable trenches, and the prefabricated cable trench includes a rectangular frame , on the inner walls of the left and right sides of the rectangular frame, there are multi-layer separation grooves, the cable pipe installation plate is fixed in the separation groove, and the cable pipe installation plate is fixed on the cable pipe installation plate. In the technical scheme adopted by the present invention, the cable channel is composed of prefabricated cable trenches, prefabricated working wells, prefabricated joint wells, and prefabricated turning wells. Each unit is factory-processed and assembled on site. In order to realize the mechanized construction of the whole process, shorten the construction period and ensure the construction of the project Quality creates conditions.

A ship large-area deck planeness rapid measurement and calculation method comprises the steps: S1, selecting a to-be-measured ship deck surface area, and determining the boundary of a measurement area; S2, determining a measurement station, and pasting a target sheet as a common point; S3, scanning and measuring a mounting surface of the to-be-measured deck surface to a base under multiple stations, and acquiring point cloud data of a measurement plane and space coordinates of the measurement common point; S4, resolving the coordinates of the common point by using a four-parameter coordinate conversion calculation model, and solving coordinate system conversion parameters; S5, fitting the point cloud data to a plane, and solving a plane fitting parameter by adopting a least square fittingmethod; and S6, rotating the point cloud data to an O-xy plane by utilizing the solved plane fitting parameter, and solving planeness data. An existing measuring and calculating method is improved, and the ship large-area deck flatness measuring and evaluating efficiency is effectively improved.

The invention belongs to timber machining equipment and discloses a large timber milling turning lathe. A core is arranged in a frame which is arranged on a trolley, water cooling devices and driving devices in Y-axial direction and Z-axial direction of a tool are arranged in the core, a tool bit is arranged on an output shaft of a water cooling motor which is arranged at the Y-axial front end of the tool, an angle adjustment device is arranged between the water cooling motor and the Y-axis of the tool, the water cooling motor is connected with the water cooling devices through pipelines, and a controller and an operation board are arranged on a lathe body. By the large timber milling turning lathe, automation in machining can be realized, labor intensity is relieved for workers, machining speed is increased while machining precision is improved, and construction quality of large buildings is guaranteed.

The invention discloses a semi-automatic building construction method. The building is composed of blocks of more than one shape and specification, steel pipes, concrete floors and concrete. The semi-automatic construction method is based on movable positioning and combination The robot assembly assembly is realized by using a robot assembly assembly, wherein the robot assembly assembly is composed of a slide rail, a PLC program-controlled lifting slide table, a mechanical arm, a hoist, a row of hole positioning blocks, an automatic screw connection device, and a concrete mixing and grouting device. The present invention makes every step in the building process highly consistent by adopting the mode of robot operation, and avoids the problem that the building quality is difficult to guarantee caused by manual operation. At the same time, the present invention only needs to rationally write the PLC program according to the actual size of the blocks, the actual scale of the building and the shape of the wall surface, etc., to realize the semi-automatic code building with high precision and low human effort, which greatly improves the quality of the building while ensuring the quality of the building. The required construction period is shortened.

The embodiment of the invention discloses an acrostic couplet generation method and device based on artificial intelligence, equipment and a medium, and relates to the technical field of computer dataprocessing. The method comprises the following steps: receiving an acrostic word set; extracting a first text and a second text from the acrostic word set as an upper sentence initial and a lower sentence initial of the acrostic couplet respectively; inputting the upper sentence initial into a neural network model to obtain a candidate upper sentence set; calling a seq2seq model and inputting thecandidate upper sentence set and the candidate lower sentence initial, and generating at least one matched lower sentence for each upper sentence; and combining the upper sentence and the lower sentence into couplet output, and if the upper sentence and the lower sentence are combined into multiple couplets, performing quality scoring on the multiple couplets, and outputting the couplet with thehighest quality score. According to the method, sampling is carried out according to the probability to obtain the acrostic word so as to improve the generation quality of the couplet, the diversity of the generated couplet is increased, the couplet is output after being subjected to quality scoring, the generation quality of the couplet can be guaranteed to a large extent, and the use experienceof a user is improved.

The invention discloses an inorganic acid passivation solution used for an electro-galvanized coating and relates to the technical field of metal surface treatment. The inorganic acid passivation solution is composed of the following substances of molybdate, tungstate, silicate, hydrogen peroxide, addition agents and water. The prepared passivation solution has the characteristics of being environmentally friendly, safe, free of pollution, good in processing quality and high in manufacturing efficiency and extremely has popularization value.

The invention relates to an artificial intelligence technology, and discloses a medical image generation method comprising the following steps: obtaining an original medical image, and preprocessing the original medical image to obtain a standard medical image; generating a first sample image set by using a medical image generation model according to the standard medical image; performing effective information amount calculation on the first sample image set, and selecting K first sample images corresponding to the effective information amount to obtain an effective image set, and inputting the effective image set and the standard medical image into an image discrimination model having a mutual constraint relationship with the image generation model for discrimination, and obtaining a discrimination result, adjusting parameters of the image discrimination model according to the discrimination result to obtain a standard image generation model, and inputting the original medical image into the standard image generation model to generate a final medical image. The method can solve a problem that the training of a medical image model consumes a large number of manpower resources.

The invention discloses a mortar and putty constructability detecting device. The device comprises a supporting frame and a measuring assembly, the supporting frame comprises an upper flat panel, a lower flat panel and a connecting rod; the upper flat panel and the lower flat panel are connected through the connecting rod, the upper flat panel is arranged above the lower flat panel, and a detecting gap is arranged between the upper and lower flat panels; a groove hole is formed in the upper flat panel, a sliding groove is formed in the concave part of the groove wall, the measuring device comprises a tension spring, a sliding panel and a scaling ruler, one end of the tension spring is connected with the part, located at the groove hole, of the upper flat panel, the upper portion of the sliding panel penetrates through the groove hole and extends to the upper portion of the upper flat panel, and the upper portion of the sliding plate is connected with the other end of the tension spring; the lower portion of the sliding plate extends to the detecting gap, a protruded sliding block is arranged by the cooperation of the sliding panel and the sliding groove, the sliding block is arranged in the sliding grove to allow the sliding panel to be slidably connected with the upper flat panel, and the scaling ruler is arranged on the upper flat panel and is used for measuring the sliding range of the sliding panel. By means of the device, the constructability can be quantified through the sliding range of the sliding panel, and therefore the constructability detecting is more accurateand reliable.