32results about How to "Avoid or reduce harm" patented technology

The invention relates to a mountainous area highway landslide risk evaluation model. The method is based on the theory of fuzzy mathematics, uses fuzzy comprehensive evaluation method, Delphi method, analytic hierarchy process and other methods to calculate the membership influencing hazard and vulnerability of highway side slope so as to obtain index evaluation level of hazard and vulnerability of slide slope risk, on the basis, adopts method of risk evaluation matrix to carry out risk evaluation of talus side slope. The model can predict, recognize, assess and analyze the slide slope risk of side slope that is possible to meet, and on the basis effectively cope with the risk to avoid or reduce the hazard of landslide geological disaster on national economy and life and property of people, and can take measures such as corresponding prevention and treatment on the basis of judgment and prediction of development and change trend of the landslide body.

The invention relates to a tunnel smoke-discharge method, which comprises: (1), insulating one independent smoke-discharge channel in the tunnel, which comprises a smoke-discharge valve, a smoke-discharge transmission channel through to the smoke-discharge channel and a smoke-discharge fan inside the smoke-discharge transmission channel; (2) in normal condition, the smoke-discharge channel, smoke-discharge valve, the smoke-discharge transmission channel and the smoke-discharge fan do not work; (3), when discharging smoke, starting the smoke-discharge valve near the smoke source, to discharge the smoke into the smoke-discharge channel, and via the smoke-discharge transmission channel to be discharge outside the tunnel. The invention also discloses a relative tunnel ventilation system, with independent smoke-discharge system. The invention can be used in variable tunnels.

The invention relates to a drop and mistaken-pull prevention infusion apparatus which comprises a plug needle, a drip chamber, a flow regulator and an infusion needle. The plug needle comprises a conical thrusting needle and a thrusting needle seat, wherein the conical thrusting needle is connected to the thrusting needle seat, more than two clamping jaws upwards facing conical thrusting needle are evenly distributed and connected to the thrusting needle seat, jaw heads of the more than two clamping jaws are clamped or hung to the side or inner end face of a sealing plug / cap of an infusion bottle / bag in a connecting mode. The infusion bottle / bag is closed up and fixed by adopting the thrusting needle seat with the clamping jaws, of the plug needle, the infusion apparatus can be effectively fixed, a plug of the infusion apparatus can be prevented from dropping out of the infusion bottle / bag, and safe, complete and effective infusion treatment can be ensured.

The invention provides an urban road network brittleness evaluation method based on anomaly detection. The urban road network brittleness evaluation method comprises the following steps: A, identifying abnormal edges in an urban road network based on anomaly detection; b, proposing a road network brittleness evaluation method based on an abnormal index; c, proposing a road network brittleness evaluation method based on the abnormal region; and D, analyzing evolution characteristics of urban road network brittleness. According to the method, the road network brittleness evaluation method basedon anomaly detection is constructed by utilizing actual road network operation data, and a decision maker can intuitively analyze an anomaly generation period, a propagation period and a recovery period, so that a reasonable adjustment and control opportunity is selected; according to the geographical distribution condition of the abnormal area, key area adjustment and control are carried out preferentially; frequently-occurring abnormal road sections are excavated, road section level prevention and control and dispersion measures are provided, and therefore harm caused by road network brittleness is avoided or reduced; the method has the advantages of real-time performance, systematicness, easiness in research and judgment, wide application and the like.

The invention discloses an air intake and exhaust pressure-bearing bidirectional pressure-regulating type water hammer protective device, and relates to a pipeline water hammer protective device. According to the invention, the problems of high installation height and water pollution existing for a directional pressure regulating tower are solved. According to the invention, the lower end of a pressue bearing water tank is provided with a supporting body; the top plate of the pressure bearing water tank is provided with an air valve opening and an overhauling port; the air valve opening is provided with an air valve; the overhauling port is provided with an overhauling closed cover; the bottom plate of the pressure bearing water tank is provided with a water injection opening and an air releasing opening; the water injecton opening is provided with a water injection pipe; the water injection pipe is provided with an overhauling valve; the air releasing opening is provided with an air releasing pipe; the air releasing pipe is provided with an air releasing vavle; the inner wall of the pressure water tank is provided with an air bag supporting plate; the air bag supporting plate is provided with an air bag; one side of the air bag is connected with the air bag supporting plate through an elastic pulling rope, and the other side of the air bag is connected with the inner wall of the pressure bearing water tank through the elastic pulling rope; and an energy dissipation plate is installed fixedly on the inner wall of the pressure bearing water tank. The air intake and exhaust pressure-bearing bidirectional pressure-regulating type water hammer protective device provided by the invention is especially suitable for a water pipe with obvious changes of topographic inequality.

Provided are a metallic reflection heat preservation cover and a manufacturing method of the metallic reflection heat preservation cover. The metallic reflection heat preservation cover mainly comprises a metallic shell and a built-in heat preservation layer. The metallic shell is a block-shaped shell formed by connecting four side wall plates, an outer wall plate and an inner wall plate. The outer wall plate and the inner wall plate are made into arc plates correspondingly and form the arc block-shaped shell together with the four side wall plates. The plate surface of the inner wall plate is coated with a high temperature resistant coating layer. The manufacturing method comprises the steps that firstly, materials are selected, then part cutting and blanking are carried out; secondly, an inner supporting frame is fixedly mounted through assembling and spot welding, and the side wall plates on the four edges and the outer wall plate are fixedly mounted on the inner supporting frame through assembling and spot welding; thirdly, multiple pieces of metallic foil are pressed respectively, arranged in the inner supporting frame and fixed; fourthly, the inner wall plate and the supporting frame are assembled and connected in a rived mode, and the block-shaped shell is formed; finally, the high temperature resistant coating layer is smeared on the plate surface of the inner wall plate. The metallic reflection heat preservation cover has the advantages of being low in manufacturing cost and environmentally friendly, generating no dust and the like, and manufacturing technology is easy.

The invention discloses a method for avoiding continuous cropping obstacles of sheltered watermelon, which includes: diluting photosynthetic bacteria culture solution, and performing irrigation and root irrigation for sheltered watermelon. By the method, disease resistance, insect resistance and stress resistance of the sheltered watermelon can be improved, various soil-borne diseases can be inhibited and reduced, healthy growth of the sheltered watermelon is promoted, and yield is increased; pesticide and fertilizer residue and other toxic harmful substances (hydrogen sulfide, organic amines and chlorobenzene) in soil and plants can be degraded, and safety of agricultural products is guaranteed; and nitrogenase activity of watermelon plant rhizosphere can be improved, organic content of the soil is increased effectively under the action of carbon fixation and nitrogen fixation of the watermelon plants, and consumption of fertilizer is reduced. Material sources for the method are extensive and cheap, the problem of failure of continuous cropping in sheltered watermelon culture is solved thoroughly, residue of harmful substances is avoided, and production of pollution-free watermelons is effectively and technically guaranteed.

The invention discloses a method for improving the shock absorption effect and stability of a downhole drilling tool and the downhole drilling tool. The method is characterized in that a hydraulic shock absorber is arranged between a lower connector and a spindle, to eliminate or relieve the up-and-down vibration caused by bit jumping; stabilizers are arranged on the outside of the hydraulic shock absorber and on the lower connector, to prevent borehole deflection caused by lateral displacements of the drilling tool. According to the invention, by improving the structure of the downhole drilling tool, the two-way hydraulic shock absorber, the drill string stabilizer and the near-bit stabilizer are integrated to one drilling tool ingeniously, the structure of the drilling tool is simplified, bit jumping and vibration are overcome, and a near-bit drill string can be guaranteed to be kept stably in the middle under the effects of torque and bending moment. In the drilling process, the drilling speed and the quality of a well bore can be improved, and the drilling cost can be reduced. By applying the method for improving the shock absorption effect and stability of the downhole drilling tool and the downhole drilling tool, damage to the drilling equipment caused by the vibration can be effectively avoided or reduced, instability caused by the bending moment of the drill string can be overcome, the service life of a bit is greatly prolonged, the quality of the well bore is guaranteed, the drilling speed is improved, and the drilling cost is lowered.

The invention provides a welding-following postheat welding method, which is characterized in that along with welding, the cross section of a weldment is heated within a distance between 55 and 500 millimeters behind a welding heat source; the temperature is between 250 and 850 DEG C; and the cross section of the weldment is naturally cooled soon. The welding-following postheat welding method provided by the invention has the advantages that as a post heat source is far (more than 50 millimeters) from the welding heat source and has no aqueous medium, the method can not interfere with electric arc or affect the metallurgical quality of welding seams; the implementation of unstressed or low-stress welding can avoid or reduce the harm of the residual tensile stress of welding, and gets rid of a working procedure of eliminating stress after welding, thereby saving labor, time and energy; appropriate compressive stress existing in the welding seams and zones near the seams is favorable for preventing stress corrosion cracking and improving fatigue life; and welding-following postheat at a low temperature (250 to 350 DEG C) can prevent welding cold cracks and can leave out the working procedure of postheating after welding, which saves labor, time and energy and can leave out special heating equipment.

The invention discloses a closed-loop roller shutter system, and belongs to the field of door and window curtains. According to the technical scheme, the closed-loop roller shutter system comprises aroller shutter, and the roller shutter comprises a blocky material which has shading and heat-insulating functions and can be rolled up. The roller shutter further comprises a thin film which has a lighting function and is resistant to ultraviolet rays and infrared rays. The blocky material and the two ends of the thin film are mutually connected and fixed to form the closed-loop roller shutter. Arotating shaft A and a rotating shaft B are arranged at the two ends of the interior of the roller shutter respectively, and the rotating shaft A or the rotating shaft B is provided with a speed reducing motor. One side or two sides of the blocky material can be provided with monochromatic or colorful characters or pictures with various visual effects. The thin film can be arranged to be a one-way perspective reflecting thin film or cut into a special shape. The system has the remarkable advantages of having shading, heat insulation, sound insulation, anti-freezing functions and being sanitary, fireproof, environmentally friendly, capable of saving energy, tidy, attractive, convenient to use and wide in application range.

The invention discloses a high-performance metal reflecting type heat preservation layer, and belongs to high-performance heat preservation equipment. The problems that for a non-metal heat preservation material, the degradation phenomenon exists, the pit filter screen blocking risk is prone to occurring, and dust can be generated to harm health of construction personnel are solved. The high-performance metal reflecting type heat preservation layer is formed by assembling and connecting high-performance metal reflecting type heat preservation blocks, and connectors have two modes of detachableconnection and non-detachable connection and have the better high temperature resistance, corrosion resistance and thermal insulation resistance; the containment circulation pit filter screen blocking risk is effectively reduced; the nuclear power plant maintenance and replacement time is shortened; the mechanical strength is high, and the anti-seismic property and the shock resistance are good;the service life is long, and the heat preservation performance is stable in the service life; no dust is generated, no pollutant diffusion occurs, and harm of radioactive substances to operation andmaintenance personnel can be avoided or reduced; and no corrosivity is generated to the equipment or pipelines.

The invention relates to a vibration damping structure for portable electronic equipment and a laptop. The vibration damping structure for portable electronic equipment comprises a casing, a damping cavity arranged on the casing, a cover board covering the damping cavity and damping parts arranged in the damping cavity. The damping cavity can be independent or a plurality of sub-aspect damping cavity divided by a separator and the damping parts can be particles, small rods or plates. When the vibration damping structure for portable electronic equipment of the invention vibrates periodically or non-periodically especially randomly due to vibration, drop and other external shocks, the damping parts enclosed in the cavity will move and lose a large amount of energy by mutual collision, thus absorbing and consuming a substantial amount of vibration energy and reducing the harm caused by vibration. The damping structure is compact, thin and light weighted and the damping does not change within a temperature range of minus forty DCG to eighty DCG, which represents the excellent property of the damping structure.

The invention provides a metal double-wall dismountable thermal insulation cover and a manufacturing method. The metal double-wall dismountable thermal insulation cover mainly comprises a metal outer shell and an inner thermal insulation layer, wherein the metal outer shell is a block-shaped box body formed by four side wall boards, an outer wall board and an inner wall board, fireproof bricks are arranged inside the block-shaped box body in an overlaying mode, fill the inner cavity of the block-shaped box body and form at least two parallel layers between the outer wall board and the inner wall board which are opposite, the outer wall board and the inner wall board correspondingly form an arc-shaped board, and an inner supporting frame is arranged inside the block-shaped box body and connect the four side wall boards, the outer wall board and the inner wall board. The manufacturing method comprises the following steps of selecting materials, cutting components, blanking, presetting the fireproof bricks, fixedly arranging the inner supporting frame through spot welding, respectively and fixedly arranging the four side wall boards and the outer wall board on the inner supporting frame through group spot welding, fill the inner supporting frame with the fireproof bricks and fixing, and group-riveting the inner wall board and the supporting frame to form the block-shaped box body.

The invention discloses a metal double-laser-beam impact forging low-stress welding device and method. The device comprises a laser welding system, a laser impact forging system and an intelligent detection control system. The method comprises the following steps that 1) the laser welding system heats the surface of a metal workpiece for welding through high-energy laser beams by utilizing heat effect radiation, and meanwhile, a second short pulse laser utilizes a shock wave mechanical effect to perform impact forging on a welding area in a forging temperature range; and 2) laser welding parameters such as pulse width, energy, peak power and repetition frequency are mutually constrained and coordinated with the impact forging parameters, and the optimal temperature region, size range and impact strengthening parameters of the laser impact forging are determined. The thermal effect and the shock wave mechanical effect are fully utilized through the double laser beams, the labor and thetime are saved, special heating equipment is omitted, the internal residual stress of a welded part can be eliminated, the damage of the welding residual tensile stress can be avoided or reduced, andgreat economic benefits and social benefits are obtained.

The invention discloses a retractable intelligent water-saving sterilization pedestal pan and belongs to the field of sanitary wares. The technical scheme is that the retractable intelligent water-saving sterilization pedestal pan comprises an excrement collector, the excrement collector is provided with a cover plate, one side of the inside of the cove plate is provided with transparent glass, the other side of the inside of the cover plate is provided with a protective plate, and an ultraviolet sterilizing lamp is disposed between the two; the excrement collector is provided with a shaft rod, the shaft rod is disposed on a bracket matched with the excrement collector, and the excrement collector can smoothly rotate relative to the bracket and can stop upwards or downwards. The power forthe excrement collector to rotate up and down is provided by a power assisting device or an electric device, and a mode of combining the electric device and the power assisting device can also be adopted. The excrement collector is overturned up and down with the shaft rod as a supporting point; after excrement is poured and drained in the overturning mode, the flushing with a small amount of water is adopted for cleaning, and the excrement collector is provided with a vibrating device and accelerates the excrement discharging speed under the vibration action. The retractable intelligent water-saving sterilization pedestal pan has the advantages of saving water, being hygienic, intelligent and environmentally friendly, saving energy and being tidy and attractive.

The invention relates to a screw, in particular to a self-tapping screw. According to the technical scheme, the self-tapping screw comprises a screw body. The screw body comprises a nut and a screw rod located at the bottom end of the nut. The screw rod is provided with threads, and a self-tapping end in a pointed cone shape is arranged at the tail end of the screw rod. A tapered cylindrical section is arranged between the nut and the screw rod. The small end diameter of the tapered cylindrical section is the same as the diameter of the screw rod, and the large end diameter of the tapered cylindrical section is smaller than the diameter of the nut. A plurality of long bar-shaped convex teeth are arranged on the circumferential face of the tapered cylindrical section. All the long bar-shaped convex teeth are arranged at intervals. A groove is formed between two threads of the screw rod and located close to the self-tapping end. The self-tapping screw has the advantages that machining and assembling are simple, the antiskid effect is obvious, an exposed part can be effectively prevented from being rusted, the service life of the screw is prolonged, and possible harm to human bodies by the exposed part can be avoided or reduced.

The invention discloses a folding-and-unfolding type water-saving and sterilizing crapping-and-peeing use system which belongs to the field of sanitary wares. The folding-and-unfolding type water-saving and sterilizing crapping-and-peeing use system is characterized in that the system comprises a cabinet; the cabinet is provided with an urinal opening, a water closet opening and an armrest opening; the urinal opening is provided with an urinal; the urinal is connected with and fixed to a right front board through a hinge; the water closet opening is provided with a water closet; one side of the back end of the water closet is hinged with and fixed to one side of a shaft hinge; the other side of the shaft hinge is connected with and fixed to a bearing plate; the armrest opening is providedwith an armrest; the armrest is provided with a box for storing articles; and the armrest is connected with and fixed to a left front board through a hinge. Through separated arrangement, the folding-and-unfolding type water-saving and sterilizing crapping-and-peeing use system has advantages of higher water-saving effect, higher sanitation, environment-friendly and energy-saving performance, effective space saving function, high neatness and attractive appearance.

The invention relates to a chemical accident early warning system and method based on emergency response data, and the method comprises a field data collection module which is used for collecting thefield information of stored chemicals; a database module which is used for storing the field information and presetting an accident prediction model which is established based on emergency response data of the chemical accident and reflects a trend relationship between the field information and the chemical accident; and a prediction module which is used for carrying out prediction according to the accident prediction model in combination with the field information so as to obtain a corresponding chemical accident occurrence trend. On the basis of basic data records of chemical accident emergency response, a typical accident prediction model is established through in-depth statistical analysis of past chemical accident record data, prediction and early warning of chemical accidents are achieved, the chemical accidents are effectively prevented, chemical accident harm and influence are avoided or reduced to the maximum extent, and casualties and property loss are reduced as much as possible.

The invention discloses an invisible pedestal pan. The invention belongs to the field of sanitary ware, and the technical scheme is as follows: the invisible pedestal pan comprises a cabinet body anda pedestal pan body, the pedestal pan body is arranged in the cabinet body, universal rotating wheels are arranged at the bottom of the front end of the pedestal pan body, a water storage bent pipe and a blow-off straight pipe are arranged at the rear portion of the pedestal pan body, threads arranged at the lower end of the blow-off straight pipe are in threaded connection with a straight-throughnut, and the straight-through nut is arranged in the middle of the turntable bracket; a circular turntable is arranged on the turntable bracket; the bottom of the rear end of the pedestal pan is connected with the panel of the circular turntable, and the pedestal pan can stably rotate in parallel by taking the straight-through nut as an axis under the common support of the universal rotating wheels and the turntable bracket; an electric push rod is arranged on one side of the rear end of the pedestal pan, the pedestal pan is driven to retract into the cabinet body when the electric push rod extends out, and the pedestal pan is driven to rotate out for people to use when the electric push rod retracts; a cleaning device and a detection device which are arranged on the top of the pedestal pan can intelligently clean the pedestal pan. The invisible pedestal pan has the remarkable characteristics of space saving, water saving, disinfection and sterilization, and neatness and attractiveness.

The invention relates to a structure of gas vibration isolation, buffering and anti-dropping damping and a laptop. The gas vibration isolation, buffering and anti-dropping structure comprises a substrate, a cover board which covers the substrate to form a gap with the substrate and is provided with a channel for the gas to flow in or out of the gap. The difficulty and resistance of gas flowing should be considered during the designing process. The cover board is connected with the substrate by a plurality of screws and a gap is formed between the cover board and the substrate. An air membrane is formed between the cover board and the substrate of the structure. The air membrance is oppressed high -speedily by the vibrating cover board and the substrate in case of mechanical vibration, dropping and impacting, and the air becomes viscous and swirly when passing the channel (gap). Due to the viscosity of the air, the energy consumption includes two parts of viscosity and eddy current loss which increase the damping of the system that rapidly attenuates the vibration or reduces the resonance amplitude, thus avoiding or reducing the harm caused by the external load.

The invention relates to a mistaken-pull prevention spiral infusion apparatus convenient and quick to dismount. The mistaken-pull prevention spiral infusion apparatus comprises a plug needle, a drip chamber, a flow regulator and an infusion needle, wherein the plug needle comprises a conical thrusting needle and a thrusting needle seat, the conical thrusting needle is connected to the thrusting needle seat, and more than one circle of threaded or spiral grooves are formed in the outer conical face of the conical thrusting needle. An infusion bottle / bag is engaged and connected by adopting the threaded or spiral grooves formed in the outer conical face of the conical thrusting needle of the plug needle, the infusion apparatus can be effectively fixed, the plug needle of the infusion apparatus can be prevented from mistakenly pulled out or dropping out of the infusion bottle / bag, and safe, complete and effective infusion treatment can be ensured.

The invention relates to a vibration-reducing and damping structural part of a portable electronic device and a notebook computer. The vibration-damping structural part of the portable electronic device includes: a damping cavity, which is opened on the casing of the portable electronic device; a cover plate, which covers the damping cavity; and a vibration-damping component, which is placed in the above-mentioned damping cavity. The above-mentioned damping cavity can be independent, or divided into several sub-damping cavities by partitions. The vibration-damping components mentioned above can be particles, thin rods, flat plates and the like. The vibration-damping structural components of the portable electronic equipment of the present invention, when periodic or non-periodic vibrations are caused by external forces such as vibration, drop, impact, etc., especially random vibrations, the vibration-damping components enclosed in the cavity move and collide with each other It consumes a lot of energy, absorbs and consumes a lot of vibration energy, and reduces the harm caused by vibration. The damping structure is compact, light and thin, and the damping does not change with temperature in the range of -40-80°C, which is its excellent characteristic.

The invention provides ultra-light lead-free medical flexible X-ray shielding clothes which comprise an upper clothes body, a protective cap body, sleeves, cuff bands, attaching strips, a lower clothes body, foot sleeve bodies, ankle restraint straps, son hook-and-loop fasteners, mother hook-and-loop fasteners, a waist restraint strap, restraint rings, a clamping seat and an inserting buckle plate, and the protective cap body is integrally sewn to the upper portion of the upper clothes body; the sleeves are sewn to the upper portions of the left side and the right side of the upper garment body respectively. The ultralight lead-free medical flexible X-ray shielding clothes are applied to medical radiodiagnosis places and are used for protecting the health of workers and patients; the ultralight lead-free medical flexible X-ray shielding clothes have extremely strong X-ray absorption capacity, also have the advantages of light weight, no toxicity, softness, long service life, environmental protection and the like, and meet the protection requirements of a series of radiodiagnosis such as X-ray shooting, chest X-ray radiography, CT (Computed Tomography) and molybdenum targets in modern medicine and the comfort requirements of wearers.

The invention discloses an air intake and exhaust pressure-bearing bidirectional pressure-regulating type water hammer protective device, and relates to a pipeline water hammer protective device. According to the invention, the problems of high installation height and water pollution existing for a directional pressure regulating tower are solved. According to the invention, the lower end of a pressue bearing water tank is provided with a supporting body; the top plate of the pressure bearing water tank is provided with an air valve opening and an overhauling port; the air valve opening is provided with an air valve; the overhauling port is provided with an overhauling closed cover; the bottom plate of the pressure bearing water tank is provided with a water injection opening and an air releasing opening; the water injecton opening is provided with a water injection pipe; the water injection pipe is provided with an overhauling valve; the air releasing opening is provided with an air releasing pipe; the air releasing pipe is provided with an air releasing vavle; the inner wall of the pressure water tank is provided with an air bag supporting plate; the air bag supporting plate is provided with an air bag; one side of the air bag is connected with the air bag supporting plate through an elastic pulling rope, and the other side of the air bag is connected with the inner wall of the pressure bearing water tank through the elastic pulling rope; and an energy dissipation plate is installed fixedly on the inner wall of the pressure bearing water tank. The air intake and exhaust pressure-bearing bidirectional pressure-regulating type water hammer protective device provided by the invention is especially suitable for a water pipe with obvious changes of topographic inequality.

The invention relates to the technical field of aluminum oxide production, in particular to application of an additive for promoting dissolution of bauxite and and adding equipment. The additive comprises iron powder and ether cellulose. The additive can be used for replacing lime and promoting aluminum oxide to be dissolved out of bauxite. While normal high-pressure dissolution of the diasporic bauxite is ensured, the use amount of the lime in the process of producing the aluminum oxide by taking the diasporic bauxite as the raw material is reduced, so that the harm of the lime in the process of producing the aluminum oxide by taking the diasporic bauxite as the raw material is avoided or reduced.

The invention provides an urban road network brittleness evaluation method based on anomaly detection. The urban road network brittleness evaluation method comprises the following steps: A, identifying abnormal edges in an urban road network based on anomaly detection; b, proposing a road network brittleness evaluation method based on an abnormal index; c, proposing a road network brittleness evaluation method based on the abnormal region; and D, analyzing evolution characteristics of urban road network brittleness. According to the method, the road network brittleness evaluation method basedon anomaly detection is constructed by utilizing actual road network operation data, and a decision maker can intuitively analyze an anomaly generation period, a propagation period and a recovery period, so that a reasonable adjustment and control opportunity is selected; according to the geographical distribution condition of the abnormal area, key area adjustment and control are carried out preferentially; frequently-occurring abnormal road sections are excavated, road section level prevention and control and dispersion measures are provided, and therefore harm caused by road network brittleness is avoided or reduced; the method has the advantages of real-time performance, systematicness, easiness in research and judgment, wide application and the like.

The invention discloses a tunnel smoke exhaust method, which includes: (1) isolating an independent smoke exhaust air duct in the tunnel, the smoke exhaust air duct is provided with a smoke exhaust damper, and an exhaust air duct connected with the smoke exhaust air duct; The smoke connecting air duct is equipped with a smoke exhaust fan; (2) The smoke exhaust duct, the smoke exhaust damper, the smoke exhaust connecting air duct and the smoke exhaust fan do not work under normal conditions; (3) when When the smoke needs to be exhausted in the tunnel, open the smoke exhaust damper near the smoke source, discharge the smoke from the opened smoke exhaust damper into the smoke exhaust duct, and then exit the tunnel through the smoke exhaust contact duct. The invention also discloses a tunnel ventilation system implementing the above method, and the ventilation system is provided with an independent smoke exhaust device. The invention solves the harm caused by fire smoke easily spreading along the longitudinal direction when longitudinal ventilation is adopted in the tunnel, and the ventilation system is energy-saving and safe, and is suitable for one-way and two-way tunnels with various cross-sections such as arched, circular and rectangular. .