131results about How to "Strong anti-destructive" patented technology

The invention relates to a hydrophobic granule and a preparation method thereof, and a waterproof breathable structure and a forming method thereof. The hydrophobic granule comprises aggregate and a hydrophobic resin film coated on the aggregate, wherein the aggregate size is 6-300 meshes, and the hydrophobic resin film is made of one or a plurality of hydrophobic epoxy resin, bakelite, polyurethane resin and silicone resin, and coated on the aggregate. The preparation method of the hydrophobic granule comprises the following steps: heating the aggregate to 50-400 DEG C; adding the hydrophobic resin, evenly stirring so that a film is coated on the aggregate surface; and cooling, crushing and screening to obtain the hydrophobic granules. The hydrophobic granule can be widely used as a waterproof breathable layer in desert planting, lake bottom seepage-proofing, river course seepage-proofing, landscape water system bottom seepage-proofing, and has favorable waterproof and breathable properties.

The invention relates to a roof water control method based on presplitting and grouting modification. The roof water control method includes the following steps that first, the height of a water diversion fissure zone on the working surface is determined; second, fracturing and grouting are carried out before determining extraction of the working surface; third, fracturing horizon and grouting horizon are determined; fourth, the fracture and grouting plane range and thickness are determined; fifth, horizontal holes of a roof stratum are subjected to hydraulic fracturing, hydraulic fracturing is carried out on the rock stratum through horizontal branch holes of the construction ground, and an original continuous medium is fractured into a discontinuous medium; and sixth, roof stratum grouting is conducted, and the water-passing capacity of the rock stratum is greatly reduced. Thereby, the roof water control method fractures the rock stratum with good continuity into a discontinuity rockstratum, then a grouting technology is adopted to transform the rock stratum into a relatively weak waterproof protective layer to achieve the dual purposes of inhibiting upward development of the water diversion fissure zone and weakening the permeability of the rock stratum, and thus the water yield of aquifer underground water of a coal roof pouring into the coal face through the water diversion fissure zone is decreased.

The invention provides an intelligent flexible crawling machine which comprises a flexible framework, a driving structure, protecting structures and crawling structures, wherein the flexible framework provides an attaching substrate for the driving structure, the protecting structures and the crawling structures; the driving structure comprises a driving film group, internal flexible electrodes, internal leads and an external flexible electrode; the driving film group is formed by bonding two driving films; the internal flexible electrodes are packaged inside two driving films; one end of each internal lead is in contact with the corresponding internal flexible electrode; the other end of each internal lead is led out and is connected with one pole of an external power supply; the external flexible electrode covers the outer surface of the driving film group and is connected with the other pole of the external power supply. The driving force of the intelligent flexible crawling machine is generated by shrinkage and relaxation of the driving films; the protecting structures are two prestretched protecting films; the crawling structures are a plurality of one-direction friction structures. The intelligent flexible crawling machine provided by the invention is made of a full soft material, is driven by using the intrinsic strain and has the characteristics of being high in crawling speed and impact resistance, low in noise and high in affinity to a human body.

The invention relates to a method for the mark, identification and information management of articles, which comprises the following steps: materials containing element marks are arranged on finished products and semi-finished products and are arrayed in different positions in the space; a database is provided, wherein, the database comprises the materials containing element marks and spatial position data of the materials containing element marks, and also comprises information which is represented by the data; the materials containing element marks and the spatial position of the materials containing element marks are detected; comparing detecting data and the data in the database, the identification and the information management of the articles are performed according to the set comparison conditions and the information which is represented by the data in the database.

The invention discloses a two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle, the innovation of the method is that related knowledge of machine vision and hydromechanics are combined, a reflecting silk thread which is a solid control model is used for transmitting visual information, according to visual information acquired by a CCD area-array camera, non- contact measurement is performed on the position and the attitude of the silk thread, a relation between spatial position variation and fluid velocity of the solid control model is established through mapping of two-dimensional image and three-dimensional Cartesian space information and a visual measurement system, so that the wind speed and direction can be indirectly measured through visual identification.

The invention relates to a blocking type mechanical anti-theft lock which comprises a lock core and a lock hole and is characterized in that the lock core is formed by laminating a plurality of steel plates; the steel plates are provided with elastic body holes; the elastic body holes are ranked in parallel, vertically through and perpendicular to slit-type lock holes at the horizontal direction; and a lock hole (5) is formed on the upper surface of the downmost steel plate, and a hole sealing plate (7) arranged on the lower portion of the lock hole and an unlocking sliding plate (10) arranged on the upper portion of the lock hole are movable pieces. During unlocking, the movable hole sealing plate (7) transversally moves for an elastic body hole diameter distance to seal the middle of the elastic body hole and block contact and connection between holes in vertical mode. By means of the blocking type mechanical anti-theft lock, keys are only inserted in or pulled out, no rotation is required, unlocking can be completed by rotating a handle for 90 degrees, and keys are not required during locking. The blocking type mechanical anti-theft lock is in pure mechanical structure and is low in manufacture cost, simple to operate, and strong in damage resistant capabilities including drilling-resistant and the like.

The invention discloses a ductile cast iron pipe with a waterproof protective layer and a production process thereof. The method comprises the following steps of: (1) performing surface treatment on the ductile cast iron pipe to remove surface oxides thereof; (2) spraying a zinc protective layer; (3) spraying a stainless steel protective layer; and (4) coating an enclosed corrosion-resistant protective layer. The invention has the advantages that: the zinc protective layer, the stainless steel protective layer and the enclosed corrosion-resistant protective layer are sequentially sprayed at the periphery of the ductile cast iron pipe through an arc spraying method, and a sacrificial anode protection function of the zinc protective layer, the wear resistance and corrosion resistance of thestainless steel coating and the hole-sealing corrosion inhibition performance of the enclosed coating can be cooperatively exerted, so that the ductile cast iron pipe is well protected. The ductile cast iron pipe with the coating structure has high corrosion resistance in a hydraulic environment, the waterproof protective layer has a neat appearance, covers uniformly and densely, has long protection period, high corrosion resistance and high damage resistance, secondary excavation construction is not needed, and the life cycle cost of a project is obviously reduced.

The invention discloses a preparation method of an antibacterial ceramic. According to the method, a glaze formulation and a glazing method are optimized and improved, so that the durable ceramic with a high antibacterial property can be obtained by a conventional universal ceramic production method under the conventional universal preparation conditions. The method has the outstanding characteristics that antibacterial ions are attached to a white carbon black carrier by a sol-gel method so as to obtain an antibacterial powder material, the antibacterial powder material is mixed with a common glaze material and the mixture is subjected to wet ball milling to prepare composite antibacterial glaze slip; then by adopting a double-layer glazing method, a common glaze material inner layer is uniformly poured and a composite antibacterial glaze slip outer layer is uniformly sprayed on the outer wall of a green body or a biscuit; finally, the obtained product is baked at a high temperature to form the required antibacterial ceramic. The method has the advantages that not only the product has the antibacterial broad-spectrum property and a high sterilizing rate, has no drug resistance and is environmental-friendly and healthy, but also the antibacterial metal ions are lost a little in the baking process, and have a high ion activity and a high usage rate; the antibacterial glaze material has good adsorbability and influences a ceramic green body a little; the ceramic is integrally high in quality and has strong damage resistance; moreover, a glaze surface is smooth and wear-resistant. Generally, the antibacterial ceramic prepared by the preparation method is controllable in cost, has high cost performance and is beneficial to scale quantitative production in the future market.

The anti-theft and pick-proof door has an electronic cipher lock controlled door outside of the inner door. The cipher lock comprises a spring bolt, a bolt mechanical device and an electronic controlled device. The electronic controlled device includes a major controller, an executive mechanism for electronically controlled unlocking and a signal receiving device. Major controller receives and verifies the accuracy of the codes and drives the electronic control device opening the cipher lock and the unlocking spring within the inner doorand the electronic controlled door props the said electronic controlled door open. The inner door has electronically controlled cipher mechanical lock with the core of the lock connected with the electronic control device. Only if the inner door code is correct, can the key to open the lock. The major controller also has a warning circuit, a timing circuit, an electronic controlled door, and the location and vibration sensor equipped on the inner door, featuring on the characteristics of warning system for wrong entering of codes, overtime code entering and strong vibration and system locking function. A power management device and a spare battery guarantee the normal operation of the electronic control system of the door. With double protective ability added, the door is safe, secure and reliable with fine appearance.

The invention provides a repairable electric heating ice-melting wind power generator rotor blade and a making method thereof. According to the repairable electric heating blade, a repairable carbon-fiber ice-melting electric heating chip is installed in the blade, and therefore the electric heating ice-melting function of the blade is achieved; meanwhile, the carbon-fiber ice-melting electric heating chip is made in a carbon fiber bundle warp and weft intersecting manner, the density of an electric current passing through the electric heating chip is adjusted by adjusting the density of carbon fiber bundles, and therefore heating temperature of the electric heating chip is adjusted. Meanwhile, by means of arrangement of a bidirectional latticed structure, warp carbon fibers are mutually connected through weft carbon fiber bundles, the warp carbon fiber bundles and the weft carbon fiber bundles form a whole in electrical performance, destruction resistance is high, and when a certain carbon fiber bundle breaks down, the heating property of the electric heating ice-melting chip is not affected; in addition, when multiple warp carbon fiber bundles are broken, the warp carbon fibers of the whole electric heating chip can be connected through the weft carbon fiber bundles, the disconnection range can be effectively narrowed, the non-heating area is decreased, and the ice-melting effect of the electric heating chip is guaranteed.

The invention discloses disc type production line equipment for the element marking of a metal workpiece. The equipment comprises a mechanical turntable system, a marking system, a replacement system, an identification system and a central control system, wherein the mechanism turntable system comprises a drive device, a plurality of rotating arms and a plurality of trays, the drive device drives a mechanical arm to rotate at a certain speed, and meanwhile, the mechanism arm drives the trays and processing workpieces on the trays to rotate at the same speed; the marking system comprises a marking device and a signal transmission device and is used for supplying pattern information to each workpiece, and the signal transmission device is used for transmitting the information data to the marking device; the replacement system is used for supplying element marking information to each workpiece, comprises a plurality of replacement devices, a plurality of replacement arms which are connected with the replacement devices and are used for controlling the contact between replacement heads and the workpieces and a plurality of replacement heads which are arranged on the replacement arms and used for contacting the workpieces and performing the replacement work; the identification system comprises an identification device and a data transmission device and is used for collecting the data information of the marked workpieces and uploading the data information to a data bank; and the central control system is used for controlling the operation of the whole production line.

A building construction structure with movable rooms is composed of a building main body, movable room beam frames and the movable rooms. The building main body comprises a plurality of sets of departments, and at least one room in each set of department is a movable room; each movable room is of a box type structure, windows are arranged on three sides of each movable room, air in the rooms can be fully circulated, and air quality is improved. When the building construction structure encounters with an earthquake, the movable rooms have strong damage resistance, and damage to human bodies can be reduced; when the building construction structure encounters with a fire hazard, the movable rooms with fireproof and heat insulation boards can be moved out of the departments to be isolated from a fire source, and safety guarantee is improved; when the movable rooms are moved out of the departments, temporary use areas of the departments can be increased.

The invention provides a cellular solid fluctuating micromechanical gyroscope and a preparation method thereof. The gyroscope comprises a base, a cellular harmonic oscillator, a support body, a drive electrode, a detection electrode, a monitoring electrode and a balance electrode, wherein the cellular harmonic oscillator is arranged on the base; the support body is located on the base, is connected with the harmonic oscillator and plays a supporting role; the drive electrode, the detection electrode, the monitoring electrode and the balance electrode are located around the cellular harmonic oscillator; the inside of the cellular harmonic oscillator is of a honeycomb structure; the cross section of a structure unit of the honeycomb is a regular hexagon; every two adjacent units share the same wall; and the strength and the rigidity are adjusted by adjusting the aperture of a honeycomb core and the height of a core column. The cellular solid fluctuating micromechanical gyroscope has the advantages of simple structure, small size, impact resistance, light weight, high Q value and the like, and is relatively low in cost and suitable for preparation in a large quantity.

The invention discloses a safety protection early warning system for a buried natural gas pipeline. The system comprises a central processing unit, an optical fiber sensing module, an environmental data acquisition module, a pipeline image processing module, a memory, a warning module, a power supply module, a wireless communication module and a monitoring terminal. According to the safety protection early warning system, the running state of the pipeline is detected in real time through the optical fiber sensing module; the environmental data around the pipeline is acquired through the environmental data acquisition module; when the leakage and sudden shock of natural gas occur, the optical fiber sensing module can be used for detecting the abnormal information of the pipeline and the position where the abnormal position of the pipeline is located; the abnormal point of the pipeline and the environmental data are marked on a pipeline image through the pipeline image processing module;meanwhile, the system is used for sending warning information and marked pipeline image information to the monitoring terminal, and thus, the on-line monitoring and safety early warning function of the pipeline are realized.

The invention discloses a hinge movable dam, which consists of a plurality of movable dam units, wherein the lower end of the water retaining dam face (1) of each movable dam unit is connected with a gate bottom tilting fillet (3) through a gate hinge (2). The hinge movable dam is characterized in that a hydraulic oil cylinder (5) is connected to the middle part of the inner side of each water retaining dam face (1); the hydraulic oil cylinders (5) are connected through synchronous motors (21); a support rod (7) is connected to the upper part of the inner side of each water retaining dam face (1); a chain (20) is connected to the lower end of each support rod (7), and is connected to a driving chain wheel (15) and a driven chain wheel (15'); each driving chain wheel (15) is connected with a driving shaft (16); each driven chain wheel (15') is connected with a driven shaft (16'); each driving chain wheel (16) is connected with a hydraulic motor (18). The hinge movable dam is simple and practical in structure, convenient to use, high in damage prevention capability, long in service life, safe and reliable, and has a good floodwater draining effect, water blocking is avoided, and good stress conditions are ensured.

The invention discloses a foldable solar energy movable power supply. The power supply comprises foldable units and an output interface, wherein, the foldable unit comprises solar cell components which are overlapped from the top to the bottom, a flexible binding material layer and a backplane; the solar cell components are connected through flexible cables; the foldable units are sealed and melted into a whole through the flexible binding material; and the output interface is connected with cathode and anode which are led from the flexible cables. The invention also discloses a method for manufacturing the power supply. The foldable solar energy movable power supply has light weight and convenient portability, and can be well folded. Compared with the prior art, the folding performance of the power supply is greatly improved. The manufacture method improves the method for feeding materials of the backplane. The hollow material feeding method solves the problem that when a small component is laminated, a polyvinyl fluoride composite film (TPT) and the component have relative displacement because of flowing of an EVA or PVB coating.

The invention discloses a high-temperature high-pressure steam split-ranging valve control device. The device comprises a valve beam, wherein a plurality of valve discs are connected to the valve beam through valve disc bolts; the valve discs are matched with valve seats; the valve beam is provided with stepped holes through which the valve disc bolts pass; bushings are arranged in the stepped holes; the valve disc bolts pass through the valve beam and the bushings; the upper ends of the valve disc bolts can be limited with the bushings; the lower ends of the valve disc bolts are in fixed threaded connection with the valve discs; the upper ends of the valve disc bolts do not exceed the top surface of the valve beam; and left and right ends of the valve beam have smooth transition structures. Through the technical scheme, the device has a simple structure, high damage resistance and low jitter, and the valve disc bolts are subjected to low and uniform load.

The invention discloses wearable equipment having a massage function. The wearable equipment comprises a wearable module and a massage module installed on the wearable module, wherein the massage module comprises a flexible massage unit, a driving unit; the driving unit comprises an electric driving film, flexible electrodes and a driving circuit; the electric driving film is combined with the massage unit and used for driving the massage unit to shrink and open; the flexible electrodes are coated on two side surfaces of the electric driving film; and the anode and the cathode of the driving circuit are electrically connected with the flexible electrodes at two sides respectively. Simultaneously, the invention further discloses an intelligent bracelet having the massage function. The intelligent bracelet comprises a bracelet body and the massage module, wherein the massage module is installed on the bracelet body. Compared with the traditional mechanical driving manner, the flexible massage action of the wearable equipment and the intelligent bracelet disclosed by the invention imitates hand action of people; therefore, the wearable equipment and the intelligent bracelet are better in comfort degree, smaller in size, lighter in weight and convenient to carry; and simultaneously, the wearable equipment and the intelligent bracelet are lower in noise in the massage process.

The invention discloses an adaptive vibration-reducing and noise-reducing foam sandwich plate and a preparation method thereof. The sandwich plate comprises an upper panel, a lower panel and a foam sandwich arranged in an intermediate layer, wherein the foam sandwich is a metamaterial isotropy ISOMAX foam structure, the structure consists of an anisotropic square wallboard structure and a triangular pyramid wallboard structure; the upper and lower panels are Qtech413 constrained damping panels, and are formed by bonding both upper and lower identical metal sheets through Qtech413 polymer damping glue and bonded. Compared with a traditional metal honeycomb and foam structure, the sandwich plate has strong rigidity and strength even under very light weight conditions, has strong anti-deformation and anti-destroying ability under strong acoustic excitation, and has ultra-light and super-strong performance; in addition, the upper and lower damping plates of the invention use the Qtech413 constrained damping plates, and can still adapt to reduction of vibration and noise in a wide frequency band without increasing structural quality and without affecting original mechanical properties of the structure.

The invention discloses a process method for connecting a metal-extrusion type pipe fitting with high infiltration prevention and relates to a construction method for connecting the metal-extrusion type pipe fitting. The process method for connection comprises the following steps of: preparing a metal-extrusion socket type pipe fitting; arranging a circumferential convex ring at a socket mouth to form a groove; placing an elastic sealing member in the groove; uniformly coating a prepared adhesive sealing glue to the circumferential surface of an inner cylinder body at the socket mouth pipe fitting joint by using a coating device or a brush; inserting a pipe, of which a pipe mouth is cleaned, into the socket mouth pipe fitting of the pipe, wherein the pipe is inserted into the depth of a limitation joint of the socket mouth; and inserting an outer wall of the pipe into a gap of an inner wall of the socket mouth of the pipe fitting, wherein the gap is between 0.1mm and 0.3mm. A jaw mould matched with the joint of the pipe is arranged by a joint clamping tool; the joint of the pipe is placed into the jaw; double or multiple paths of compressed rings are pressed by cylinder bodies on two sides of the convex ring of the sealing member; and the socket mouth of the pipe and a sub-lock of the pipe are fixed integrally. The defects of pure elastic sealing or pure rigid sealing are overcome, so that the pipeline is reliably connected and the anti-damage capability is stronger; and therefore, the process method is a powerful sealing type method for the joint of the pipe with high pressure resistance and high security.

The invention relates to a modified copper-based pantograph sliding material and a preparation method. The material contains raw materials of Cu, Ti2AlC, BN and graphite in a volume ratio of (60-95) to (1-30) to (1-10) to (1-5). The method comprises the following steps of: mixing the four raw materials and putting the mixture in a steel die; firstly carrying out cold pressing to the mixture, putting the mixture in a high-temperature furnace under the protection atmosphere of hydrogen, increasing the temperature to 700-900 DEG C, keeping the temperature for 5-30 min, taking out a sample and carrying out cold pressing; then, secondarily sintering at 800-900 DEG C and keeping the temperature for 30-60 min. The invention has simple process, is convenient to operate, can rapidly prepare the modified copper-based pantograph sliding material by utilizing traditional production equipment, and the material has the advantages of excellent performance and lower cost.

The invention provides an aircraft carrier with a ridge bottom tank, which relates to a military equipment, the structure of which comprises the ridge bottom tank, a causeway and a power propeller. The invention is characterized in that: the bottom tank of the aircraft carrier consists of a plurality of ridge bottom tanks which are longitudinally arrayed at intervals; the causeway is arranged between the adjacent two ridges; the rear part of the causeway is widened and is provided with the power propeller. Compared with the prior art, the aircraft carrier with the ridge bottom tank of the invention is characterized by reasonable design, small navigation resistance, shallow draught, strong power, energy saving performance, strong mobility, strong anti-damage capacity, stability, easy control, etc., and simultaneously the ridge bottom tank structure is also applicable to large naval ships for other uses, thus realizing favorable use value.

The invention discloses a burglarproof deception-proof code system of automobile, which comprises the following parts: CPU, data input and display equipment, alarming device, wherein the CPU connects each original ECU in the automobile; the legal user with two patterns as 'manager' and 'visitor' is stored in the CPU; the system enters 'normal' working pattern when enrolling the system at 'manager' ID; the user can operate automobile normally and sets 'visitor' user and effective driving time; the system can be enrolled to do normal operation within effective driving time preset by user when the user enrolls the system at 'visitor' ID; otherwise, the system can't be enrolled; if the user information is different from the stored user information in the CPU, the system enters 'burglarproof alarm' working pattern to trigger alarming device without starting automobile. The invention not only has reliable burglarproof ability, but also possesses unique robbery-proof function.

The invention relates to an integral V seam filter self-cleaning sieve tube, which consists of a base tube and a filter, wherein the filter consists of a filtering core and a protecting cover, and the filtering core consists of a central column, a plurality of filtering rings and a fixing ring; all the filtering rings are coaxially nested together, and the central column is embedded in the filtering ring having the smallest inner diameter; the fixing ring is sleeved outside the filtering ring having the largest inner diameter, and the shape of the fixing ring corresponds to the shape of the filtering ring having the largest inner diameter; the central column, the filtering rings and the fixing ring are connected by a plurality of reinforcing ribs, and the reinforcing ribs are radially equispaced outwards by taking the central column as a center; the outer wall surface of the central column and the outer wall surfaces of all the filtering rings are inverted conical surfaces; the inner wall surface of all the filtering rings and the inner wall surface of the fixing ring are straight surfaces; and the protecting cover is covered on the upper part of the fixing ring, and the top surface of the protecting cover is provided with a plurality of louver windows. The integral V seam filter self-cleaning sieve tube has the advantages of strong deformation resistance, stable sizes of filter seams, high precision of baffle sand, high permeability and jam resistance.

The invention discloses an intrusion detection system and a method thereof. The system has a plurality of detection networks arranged on a guarding site; and a bus is used to connect the detection networks to a remote monitoring center. The method comprises the following steps: a wireless sensing module is added into a network established by a wireless data module and uploads a neighbor sheet after receiving a network address distributed by the wireless data module; a network topological graph is formed at the remote monitoring center end; broadcast is transmitted and received after the work parameters of the remote monitoring center are received; the radio signal strength of the broadcasting signal is acquired and is routed and uploaded to the wireless data module; the wireless data module carries out a decision algorithm according to the information so as to determine whether the intrusion behavior brings about the abnormality of the radio signal strength; in case of abnormity, the wireless data module gives off an alarm and determines the position of an intruder through the positioning algorithm in a sensitive area; and the position of the intruder and the alarm information aresent to the remote monitoring center. The intrusion detection system can identify the intrusion behavior, give off the alarm and determine the position of the intruder without being easily affected by environmental factors, as well as has a high interference killing capability and low cost.

The invention provides a piezoresistor ceramic material and a preparation method thereof. The preparation method is as follows: (1) mixing silicon carbide, silicon nitride, kaolin, tin dioxide, vanadium pentoxide, boron carbide, strontium carbonate, manganese carbonate, monazite, spherical nano titanium dioxide and anhydrous ethanol, and performing ball milling; (2) performing drying in an oven; (3) adding polyanionic cellulose, potassium perchlorate, beeswax, orthophosphate and polycarbonate, performing uniform mixing and adding the obtained mixture to a twin-screw extruder for extrusion granulation; (4) adding the material obtained in the step (3) into a uniaxial hydraulic press for pressing to obtain circular sheets, performing degumming at a temperature of 600 to 700 DEG C; and (5) putting the obtained material into a sintering furnace for sintering. The piezoresistor ceramic material disclosed by the invention has low leakage current, high nonlinear coefficient, good non-linear performance, high density, strong anti-destruction capability, good anti-aging effect, simple preparation method and low cost.

The invention provides a splicing-type heat-preservation waterproof roofing slate and a composite structure thereof and a construction method. The problem that sealing at combination of adjacent slate bodies of a waterproof heat-preservation composite board and a composite structure thereof is untight is solved, and the traditional construction method is simplified. A roofing slate body is provided with a supporting side end and a lap joint end, a transverse lap-joint eave is provided with a front end extending in an aslant-downward mode, and a boss is arranged at the lower portion of a back end face of a heat-preservation layer; a groove opening formed in the portion, located at the upper portion of the boss at the back end face of the heat-preservation layer of the roofing slate, of the front portion of the composite structure is filled with polyurethane polyfoam. The construction method includes the steps of transverse laying and longitudinal laying; foam filling grooves in the supporting side ends of the slate bodies are filled with polyurethane polyfoam, and the transverse lap-joint eaves at lap-joint side ends of transverse adjacent roofing slates are buckled on waveform fiber tiles at the supporting side ends of the adjacent slate bodies; the traditional construction method is simplified, the waterproof performance is reliable and lasting, the water draining function is powerful, the heat preservation performance and the heat insulating performance are good, the fireproof performance is excellent, damage resistance is high, and the waterproof and heat-preservation effects are obvious.

The invention relates to a fibrous Ti3C2MXene-based torsion angle sensor and a preparation method of the fibrous Ti3C2MXene-based torsion angle sensor. According to the sensor, a Ti3C2 nanosheet is used as a strain-sensitive material, the strain-sensitive material is assembled on a framework of foam fibers, and a flexible polymer is used as a substrate for providing large deformation, so that thesensor with torsion response characteristics is prepared. The fibrous torsion angle sensor can give torsion angle values corresponding to different rotating speeds by monitoring electric signals undertorsion deformation in real time, and has the characteristics of easiness in preparation, stable performance and recyclability. Due to the fact that the novel two-dimensional nano material Ti3C2 hasgood conductivity and is convenient to synthesize, the novel two-dimensional nano material Ti3C2 can be directly deposited on the surface of the framework of porous fibers in an immersion adsorption self-assembly mode, and the Ti3C2-based flexible porous conductive fiber with torsion angle response is obtained. The structure of the sensor is improved, the performance of the sensor is improved, thesensitivity is good, and the damage resistance is improved.

A double-layer high-speed overhead flyover for cars is suitable for main roads or secondary main roads. The overhead flyover, corresponding to two directions A and B, is composed of a first bridge floor, a second bridge floor, four ramps, four platforms, and pillars. The overhead flyover is specially-designed for cars and is characterized by miniaturization and low weight, is less in occupied materials and is light in weight and low in cost. The overhead flyover can be manufactured and assembled from steel structures through industrial production in factories, so that a new manufacturing industry entity can be formed. The high-speed overhead flyover achieves single-layer and one-way traffic of cars; according to invention, a high-speed crossroad overhead flyover is linked to a crossroad while a high-speed T-junction overhead flyover is linked to a T-junction. The overhead flyover can create a traffic network without traffic lights for whole city, which would be a wonder of city traffic.

The invention provides a preparation method of a toughness-enhanced melamino-formaldehyde polyvinyl alcohol composite foam material, which comprises the following steps: soaking melamino-formaldehydefoam in a polyvinyl alcohol water solution, adsorbing to be saturated, soaking in a crosslinking agent solution, curing and crosslinking to obtain the melamino-formaldehyde polyvinyl alcohol compositefoam material, and drying to obtain the toughness-enhanced melamino-formaldehyde polyvinyl alcohol composite foam material, wherein the alcoholysis degree of the polyvinyl alcohol is 60-99%, the molecular weight of the polyvinyl alcohol is 10000-250000, the viscosity of the polyvinyl alcohol is 2.0-125.0 mPa.s, and the cross-linking agent is selected from one or more of urea, boric acid, citric acid, formic acid, formaldehyde, glyoxal, glutaraldehyde and calcium chloride. The composite foam material with an interpenetrating cross-linked network structure is constructed by utilizing a chemicalcross-linking reaction of hydroxyl (-OH) in PVA molecules and a secondary amine group (-NH-) in the MF foam material under the action of the cross-linking agent through physical adsorption and chemical cross-linking treatment, the toughness of the composite foam material is remarkably improved, and the composite foam material has excellent damage resistance.