49results about How to "Reduce ventilation time" patented technology

The invention discloses an in-situ carbonization curing treatment method for a shallow soft ground, and belongs to the field of civil engineering ground stabilization. The method includes the steps that pretreated ground soil is broken and stirred through a crawler-type stirrer; a first curing agent and a second curing agent are mixed, the mixed curing agents are sprayed into the ground soil, and the mixed curing agents and the ground soil are evenly stirred; U-type drain boards are inserted at intervals through a board inserting device; a compacting device and a film laying device are started, and films are laid while the treated ground soil is rolled; carbon dioxide gas is injected to carry out ventilating carbonization on the compacted ground soil; the steps are repeated, and the steps of mixing the curing agents for the pretreated ground soil, inserting the drain boards, and compacting, sealing and stabilizing the treated ground soil in a carbonization mode are completed continuously. The treatment system and method are simple and reliable and capable of adapting to a complex environment, construction is safe and efficient, and quantification of the curing agents in ground treatment and resource utilization of carbon dioxide are achieved.

The invention discloses a tunnel excavation water pressure blasting construction method. The tunnel excavation water pressure blasting construction method comprises the following steps of (1) arranging a trolley in place and conducting danger elimination; (2) measuring, distributing and drilling holes; (3) installing explosives, water bags and stemming, wherein the peripheral holes are excavated on the arc edge of the tunnel face of a tunnel, and the explosives, the water bags and stemming are installed in the following manners of air spacing, decoupling charge and the explosive quantity at hole bottoms more than that of other parts; cut holes are drilled in an inclined mode, and the included angle between the cut holes and the excavation face is 65 degrees-75 degrees; the continuous coupling charge method is adopted for loosening holes, relief holes, inner ring holes and bottom plate holes, blasting caps are buried into hole bottom cartridges, and energy gathering holes face orifices;the water bags are arranged at the hole bottoms of shot holes, and the water bags are arranged again after completion of explosive charging, and the holes are blocked through the stemming; (4) detonating a detonating network; (5) conducting after-detonation check and misfire processing; and (6) withdrawing the explosives to the warehouse. Through the tunnel excavation water pressure blasting construction method, the energy of explosives can be made full use of, environmental pollution can be reduced, and the cost can be saved.

The invention discloses a periphery hole charging structure for energy-gathered hydraulic pressure smooth blasting, and a construction method thereof, and belongs to the technical field of tunnel construction. The periphery hole charging structure for energy-gathered hydraulic pressure smooth blasting is formed by a shot hole, water bags, an energy-gathered pipe powder charge and a stemming, wherein the water bags, the energy-gathered pipe powder charge and the stemming are arranged in the shot hole; the bottom of the shot hole is a section of water bag; the middle part of the shot hole is twosections of water bags; the energy-gathered pipe powder charge is arranged between the water bag on the bottom of the shot hole and the water bags in the middle of the shot hole; the stemming is blocked in the shot hole; a high-temperature high-pressure gas produced by explosion produces a 'water wedge' effect through a jet flow formed in an energy-gathered groove and the water bags in the smoothblasting shot hole under a blasting action, so that a rock initial crack is promoted to extend, expand and enlarge; meanwhile, due to a composite blocking function of the water bags and the stemming,the formed crack is favorably extended, expanded and enlarged; and the water bags are placed in the smooth blasting shot hole, and a water spray formed in the blasting process further plays a role infalling dust, so that the ventilation time is reduced, the working environment is improved, and the body health of constructing personnel is protected.

The invention discloses a diffusion process of a crystalline silicon solar cell and mainly relates to preparation of a P-N junction by a liquid phosphorus source diffusion method during the production process of the crystalline silicon solar cell. The diffusion process is characterized in that a small amount of oxygen is firstly introduced during the heating process in a diffusion process step after feeding of a boat, and a silicon dioxide thin layer is formed, so that phosphorus atoms deposited on the surface of a silicon chip can only be diffused and enter the silicon chip after passing through a thin film of the silicon dioxide layer, and then the uniform diffusion effect can be realized; then high-temperature source introduction deposition is performed, so that a metal precipitate and a metal complex can be rapidly and effectively dissolved; cooling is further performed, only nitrogen is introduced, and source supplementation secondary low-temperature source introduction deposition is further performed, so that the driving force for absorbing impurities is greatly increased; and propelling and cooling are finally performed. By adopting the process disclosed by the invention, the photoelectric conversion efficiency of the solar cell can be effectively upgraded, the production time is greatly shortened, the production productivity is upgraded, the using quantity of phosphorus sources is saved, and the production cost is reduced; and furthermore, the process is simple and feasible, and additional process steps and materials are not required.

The invention specifically relates to a ventilation method of inclined shaft assisted double-hole construction. The ventilation method comprises the following steps: A, analyzing a pollution source and determining a ventilation standard; B, designing a ventilation system; and C, calculating tunnel ventilation parameters, selecting a fan and implementing a scheme; the ventilation system in the step B is specifically as follows: an axial-flow fan is arranged at an outer hole of an inclined shaft at an inclined shaft construction phase and a phase when inclined shaft construction is completed and a tunnel portal does not communicate with the inclined shaft, and a heading-face forced ventilation pattern is adopted with an air duct extending into a working face for ventilation; at a phase when the tunnel portal communicates with the inclined shaft, the tunnel portal is communicated with the inclined shaft and a jet flow gallery ventilation pattern is adopted, and a secure tunnel and a main tunnel both serve as air intake channels, while the inclined shaft serves as an exhaust channel. The ventilation method in the inclined shaft assisted double-track construction solves a long-distance problem that single forced ventilation fails in solving, and is high in ventilation efficiency and good in effect; moreover, the ventilation time is shortened and the construction efficiency is improved, and both electricity and air ducts can be saved; in addition, maintenance is convenient.

The invention provides a full-automatic tunnel concrete lining maintenance device comprising a maintenance rack, a controller, a water spraying device and a power distribution box. The water spraying device is composed of a pressurizing pump, two rows of arc water spraying pipes and atomizing nozzles. The lower portion of the maintenance rack is provided with a walking device and the controller. The upper portion of the maintenance rack is provided with the two rows of parallel arc water spraying pipes. The full-automatic tunnel concrete lining maintenance device is easy to operate, achieves automatic maintenance, can automatically walk and spray water and effectively reduces cracks on the surface of lining concrete, the walking speed of the full-autonomous tunnel concrete lining maintenance device can be automatically controlled through a remote controller, the strength and the durability of a concrete lining are guaranteed, and indirect economic benefits are generated; the full-automatic tunnel concrete lining maintenance device is suitable for maintenance of all kinds of tunnel lining concrete, improves construction efficiency, lowers the maintenance process cost, improves the appearance quality of concrete, purifies air in a tunnel, and shortens ventilation time. Remarkable economic benefits are created for construction. The full-automatic tunnel concrete lining maintenance device further has the advantages of being simple and compact in structure, low in manufacturing cost and easy and convenient to use.

The invention provides an explosion prevention and noise elimination integrated intelligent speed regulating local fan. The explosion prevention and noise elimination integrated intelligent speed regulating local fan comprises a fan shell of a barrel-shaped structure, a drainage apparatus is arranged at one end of the fan shell, and a current collector is arranged on the inner side of the drainage apparatus; a fan linear temperature speed regulating device is arranged at the other end of the fan shell; and a first-stage explosion prevention motor and a second-stage explosion prevention motor are further arranged in the fan shell, the axial directions of the first-stage explosion prevention motor and the second-stage explosion prevention motor are parallel to the length direction of the fan shell, a rotating shaft of the first -stage explosion prevention motor right faces a rotating shaft of the second-stage explosion prevention motor, and the rotating shafts of the first-stage explosion prevention motor and the second-stage explosion prevention motor are each provided with an impeller. Defects of an existing local fan are overcome. The explosion prevention and noise elimination integrated intelligent speed regulating local fan belongs to the technical field of ventilating devices.

The invention discloses a blasting construction method suitable for a hydraulic pressure smooth surface of a granitic geological III-grade surrounding rock. The blasting construction method comprisesthe following steps: (1) excavating each shot hole including a center breaking-in hole, an inclined breaking-in hole, an auxiliary hole, a coping hole, a bottom plate hole and a peripheral hole; (2) blowing out residues in each blast hole through high-pressure air; (3) mounting an explosive roll clamped between water bags into each shot hole according to blasting design requirements, adopting a stemming material for sealing an opening end of the shot hole, and connecting the explosive roll to an electronic detonator initiation system; (4) checking safety of the electronic detonator initiationsystem, and detonating according to a sequence of blasting the inclined breaking-in hole, the center breaking-in hole, the auxiliary hole, the coping hole, the bottom plate hole and the peripheral hole; and (5) after no squib is checked, performing deslagging operation to accomplish construction. The blasting construction method uses hydraulic pressure blasting to improve drilling depth of the surrounding rock, saves usage amount of explosives, saves conventional blasting ventilation time, controls back break, improves construction efficiency, and greatly saves comprehensive cost by 8.9% in comparison with that in the prior art.

The invention relates to an air purifier for removing harmful gas and dust in a long tunnel, which aims to solve difficulty of ventilation in construction of the long tunnel. By the aid of a centrifugal fan, harmful gas CO, CO2, NO, NO2, sulfide and dust in the long tunnels are delivered into a degradation tank through an induced draft hood and a connecting pipe. Residual CO and NO after degradation are delivered into an adsorption box through a connecting pipe, steam in residual gas is filtered by porous fiber separation membrane, residual CO and a small quantity of NO are adsorbed by a low-temperature variable-pressure adsorption tower after the processes of degradation and membrane filtering, the variable-pressure adsorption tower adsorbing CO and NO is delivered out of the tunnel, and then CO and NO are desorbed after the adsorption tower is heated to the temperature ranging from 80 DEG C to 135 DEG C by electric heating tapes in the adsorption tower. The air purifier for removing harmful gas and dust in the long tunnel has the advantages that harmful gas delivery distance is short, ventilation time is short, ventilation efficiency is high, service cost is low and the like, pollution caused by harmful gas of a tunneling face to the integral tunnel can be avoided effectively, and the air purifier is applicable to removing harmful gas and dust of the tunneling face of the long tunnel.

The invention provides a full-automatic spraying curing equipment for a tunnel. The equipment is suitable for curing concrete at the top of the tunnel and mainly comprises a distance sensor, sprayingassemblies, a support, a lifting device, a lifting motor, a water pump, a traveling motor, a chain transmission, a vehicle body, a water tank, a magnetic flip liquidometer and an electric control cabinet. The full-automatic spraying curing equipment is easy and convenient to operate and can automatically travel, travel in the opposite direction and spray, and as needed, the equipment can also be switched to be manually controlled. The water spraying amount can be automatically adjusted to enable the water spraying amount to be in the best state, so that cracks in the surface of lining concreteare effectively reduced, the concrete lining strength and durability are guaranteed, economic benefits are indirectly generated, and the equipment is suitable for curing construction of various typesof tunnel lining concrete. By means of the equipment, construction efficiency is improved, the curing procedure cost is lowered, the concrete appearance quality is improved, air in the tunnel is purified, and safety and reliability are improved. The full-automatic spraying curing equipment further has the advantages of being concise and compact in structure, low in manufacturing cost and easy andconvenient to use.

The invention relates to a method for clearing harmful gas and dust in a long tunnel, aiming at solving a problem of difficulty in ventilation of the whole tunnel during a construction period of the long tunnel. The method for clearing harmful gas and dust in the long tunnel orderly comprises the following steps of: carrying and transporting a ventilator by a movable carrier, and transmitting harmful gases of CO, CO2, NO, NO2, sulfide and dust to a degradation pool by a fan; degrading the harmful gases of CO2, NO, NO2, sulfide and dust through reaction of alkali compounds in the degradation pool, and filtering steam by a porous fiber separation membrane; absorbing CO and a little NO through a low-temperature pressure swing absorption tower after degradation and membrane filtration; carrying the pressure swing absorption tower which absorbs CO and NO out of the funnel, and heating to 80-135 DEG C by an electric heating strip in the absorption tower so as to remove CO and NO. The method has the advantages of short conveyance distance of the harmful gases, short ventilation time, high ventilation efficiency, low using cost and the like, can effectively clear pollution of the harmful gases in the whole funnel, and is suitable for clearing the harmful gases and dust in a driving face of the long funnel.

The invention provides a negative ion air purification method for a highway tunnel. A negative ion dropping and removing scheme is adopted, and the mechanism that negative ions can have a chemical reaction with poisonous and harmful gases, such as NOx, SO2, H2S and VOCs, and tail gas, dust, germs and the like are gathered into large particles to be dropped and removed is utilized. In reference to tunnel construction or the harmful gas concentration distribution situation, researched negative ion generation devices are installed at the proper positions on the two sides or the single side of a tunnel and distributed in a strip shape or three-dimensionally, and the negative ion generation devices are matched with construction.

The invention discloses an orientation distributing device and method for ventilation volume of tunnel construction. The device comprises a distributing box and a mounting support for horizontally mounting the distributing box; the distributing box comprises a distributing box body of which the front part and the rear part are opened, an air outlet structure arranged at the front side of the distributing box body and an air inlet structure arranged at the rear side of the distributing box body; the air inlet structure comprises left and right air inlet joints which are mounted together; the air outlet structure comprises left and right air outlet joints which are mounted together; the inside of the distributing box body is divided into left and right air supply channels by a separating device; and the separating device is vertically arranged and comprises a separating seat fixed in the distributing box body, a movable door and a swing driving device. The method comprises the following steps: firstly, mounting a ventilation system of a tunnel; and secondly, performing orientation distribution of the ventilation volume. The orientation distributing device disclosed by the invention is reasonable in design, simple and convenient to use and operate and good in service effect; and the ventilation volumes of two tunnel holes in the construction process can be flexibly distributed simply and conveniently, and the utilization rate of ventilation equipment is improved.

The present invention is the semi-automatic control method of feedback ventilation temperature in producing aerobic compost in the compost temperature controlling technology. The semi-automatic control technology of feedback ventilation temperature combining automatic control and manual control is to control the compost center temperature in 70-75 deg.c and 55-65 deg.c in different stages. The said method can kill pathogenic bacteria, maintain optimized compost degradation and water elimination, maintain the set temperature through manually controlling the blower in the late stage for speeding fermentation and shortening processing period, lower power consumption, and realize harmless compost production.

The invention discloses a resistive board chamber detector which comprises a first circuit board, a second circuit board, a first glass piece, a second glass piece, a first graphitic layer, a second graphitic layer, a third glass piece and an annular sealing strip. The first circuit board and the first circuit board are arranged in a spaced mode, the sealing strip is connected between the first circuit board and the second circuit board, a sealing cavity is defined by the sealing strip, the first circuit board and the second circuit board together, an air inlet and an air outlet are formed in the sealing strip in a spaced mode, and both communicated with the sealing cavity, and the first glass piece, the second glass piece and the third glass piece are all located in the sealing cavity. The resistive board chamber detector is a self-sealed multi-air-gap resistive board chamber detector, has the self-sealing performance, does not need to be placed in a flow air box and can independently work, therefore, the cost for manufacturing the flow air box is omitted, and ventilation time and air exchange time spent in preparation before an experiment are shortened.

The invention provides a water pressure blasting construction method for a steeply inclined thin ore body. The water pressure blasting construction method comprises the following steps that a blasting free surface is constructed on the steeply inclined thin ore body, a plurality of blast holes are constructed in the blasting free surface, a certain angle is formed between the extension direction of the blast holes and the horizontal direction, explosive cartridges and water bags are installed in the blast holes, openings of the blast holes are blocked through tamping plug, the explosive cartridges are electrically connected with an electronic detonator detonating system, the electronic detonator detonating system is checked, the safety of the electronic detonator detonating system is confirmed, then detonating is conducted according to the sequence from outside to inside, the ore body after blasting is checked, the safety of the ore body is confirmed, deslagging operation is conducted, and construction is completed. According to the water pressure blasting construction method, blasting construction efficiency is improved, and the comprehensive cost is reduced.

The invention discloses blasting equipment for water-spaced annular non-coupling charging in a blast hole, which comprises a double-layer sleeve arranged in the blast hole, the double-layer sleeve is divided into an outer pipe and an inner pipe, an annular gap is formed between the outer pipe and the inner pipe, water is contained in the annular gap, the bottom of the inner pipe is of a closed structure, explosives are contained in the inner pipe, and a detonation explosive package is arranged at the bottom of the inner side of the inner pipe. The blasting equipment has the characteristics of uniform blasting stress and annular non-coupling charging capable of the utilization rate of explosives.

The invention provides a self-adaptive municipal sewage sludge mixing machine, and relates to a device for cleaning sewers. The self-adaptive municipal sewage sludge mixing machine comprises an uppershell and a lower shell; a vertical first pipeline and a vertical second pipeline are fixedly arranged in the upper shell; the first pipeline extends downwards out of the lower shell and is fixedly connected with a rotary nozzle; a first annular groove recessed upwards is formed in the lower surface of the lower shell; the second pipeline downwards communicates with the first annular groove; fourwall climbing mechanisms are symmetrically arranged in the upper shell in pairs; and a stirring mechanism is arranged on the lower shell. After a sewage well is opened, a worker can directly go down to the well for operation, ventilation is conducted while the machine operates, and the accident risk of the worker is reduced; the stirring mechanism is used for replacing manual stirring, labor forceis saved, the sludge is directly smashed and stirred, and primary suction work in the existing process is omitted; the wall climbing mechanisms have the characteristic of telescopic floating, the machine can adapt to uneven wall surfaces with attachments on the sewage wall and is also suitable for rectangular rainwater well desilting work, and multiple purposes and universalization are achieved.

The invention discloses a mining anti-explosion local ventilator which comprises a drainage machine, a primary box body, a primary explosion-proof motor, primary blades, a secondary box body, a secondary explosion-proof motor, secondary blades, a silencer and an air outlet. The blades are arranged on bearings of the explosion-proof motors, the primary blades and the secondary blades rotate oppositely, the silencer is connected with the secondary box body, and the air outlet is formed in the end opposite to an induced draft fan. The power of the primary explosion-proof motor is equal to that of the secondary explosion-proof motor. The radial clearance between the blades and the corresponding box bodies is 1.6%o-3.7%o of the diameter of an impeller. The number of the primary blades is 12. The number of the secondary blades is 11. The primary blades and the secondary blades are integrally-cast plastic blades. The mining anti-explosion local ventilator is high in safety performance, reasonable in structure, high in ventilation efficiency and suitable for long-distance ventilation.

The invention relates to an air exhaust module and a whole-house regional fresh air replacement system. The air exhaust module comprises an air inlet cavity and an air exhaust cavity, an air exhaust fan is arranged in the air exhaust cavity, an air outlet of the air exhaust fan communicates with the outside through a main air exhaust pipe, and an air suction opening of the air exhaust fan communicates with the air inlet cavity; at least two air inlets are formed in the air inlet cavity, and air doors are arranged on the air inlets; and branch air exhaust pipes are arranged on the air inlets.

The invention relates to a surgical tent capable of being quickly assembled. The surgical tent comprises a three-way combiner, supporting air bag frameworks, framework plates, air bag pipes and a partition wall cloth. The three-way combiner is formed by three steel tubes which are perpendicular to one another and communicated with one another, the inside of each steel tube is provided with one supporting air bag framework, and the supporting air bag frameworks are main stress supporting bodies of the whole surgical tent; each supporting air bag framework is formed by an annular steel tube with a 45-degree notch, and one air bag pipe and one framework plate are arranged in each annular steel tube; each framework plate is formed by a cambered long-strip-shaped steel plate and is formed by a U-shaped positioning fork capable of rotating by 90 degrees; each air bag pipe is made of rubber, and one end of each air bag pipe is formed by an air bag pipe suction and exhaust valve; a gas defense passage is formed by an airtight door, a one-way suction and exhaust pipeline valve and two folding telescopic air bags. The surgical tent has the advantages of being low in weight, good in air tightness, capable of being quickly assembled; an operation can be carried out in the surgical tent in a contaminated condition. By means of the surgical tent, the difficult problem that no operating rooms exist in small hospitals of rural areas and towns in China can be solved.

The invention belongs to the technical field of underground mine excavation, particularly relates to an underground mine cutting raise (vertical shaft) medium-length hole one-time well forming construction process, and particularly relates to a high-depth large-section medium-length hole one-time well forming method which can replace manual construction to cut raises. In process, constructor operates a drill jumbo in a gate way to construct upward vertical blast holes, explosive loading is also completed in the gate way, the operation space height is small, the roof risk is controllable, the gate way is used as a compensation space, delay blasting and one-time well forming are adopted, the construction efficiency is high, construction is easy, mechanical operation is achieved, the safety risk is small, and the labor intensity is low.

The invention relates to a tunnel blasting smoke emission device and belongs to the technical field of blasting engineering auxiliary devices. The tunnel blasting smoke emission device comprises a fixed partition board and a movable partition board. The shapes and specifications of the fixed partition board and the movable partition board are matched with the shape and specification of the cross section of a tunnel. The fixed partition board and the movable partition board are arranged along the same central axis. Guide rails are arranged to be matched with the movable partition board so thatthe movable partition board can do reciprocating motion along the guide rails. The length direction of the guide rails is consistent with the thickness direction of the movable partition board. Damping devices are arranged between the movable partition board and the fixed partition board. The fixed partition board is provided with a smoke discharge hole. A valve is arranged in the smoke dischargehole in a matched mode. A smoke discharge pipe joint is arranged at the end, far away from the movable partition board, of the smoke discharge hole. The tunnel blasting smoke emission device centralizes smoke and dust generated after blasting in a certain space without emission firstly, extracts the smoke and dust out through a suction type draught fan in a centralized mode to achieve the purposeof quick smoke emission and can shorten the ventilation and smoke emission time after blasting and ensure the health and safety of site construction personnel.

The invention relates to an inflatable smoke exhaust and dust removal isolating hood for tunnel shaft construction, aiming at solving the problems that the dust removing effect is poor, the energy consumption is great and the health of construction personnel is jeopardized during treatment of dust produced when a drilling and blasting method is adopted for excavation of the tunnel shaft at present. The inflatable smoke exhaust and dust removal isolating hood for tunnel shaft construction comprises an exhaust fan. An exhaust hose which stretches out of a shaft mouth and is fixedly arranged at the shaft mouth is sheathed at the upper part of the exhaust fan. An umbrella-shaped flexible isolating layer which is fixedly arranged at the lower part of the exhaust fan is sheathed at the lower part of the exhaust fan. A plurality of steel frameworks which are radially arranged are fixedly arranged on the umbrella-shaped flexible isolating layer. The lower end of the umbrella-shaped flexible isolating layer is connected with an annular flexible inflatable sleeve. A blower which is communicated with the annular flexible inflatable sleeve is fixedly arranged on the side wall of the exhaust fan. An air compensation pipe is fixedly arranged on the side wall of the exhaust fan, wherein the lower part of the air compensation pipe is arranged in the umbrella-shaped flexible isolating layer and the lower end of the air compensation pipe is closed. A one-way valve is arranged on the side wall of the lower part of the air compensation pipe. The inflatable smoke exhaust and dust removal isolating hood for tunnel shaft construction has the advantages of simple structure, convenience in operation and low cost.

The invention discloses a building interior decoration construction method. The method comprises the following steps: (1) leveling a wall surface; (2) repairing the wall surface; (3) preparing a caustic soda aqueous solution; (4) smearing a caustic soda aqueous solution; (5) coating a binder; (6) scraping putty; (7) erecting a track; (8) spraying wall paint; and (9) air purification. According to the building interior decoration construction method, the content of harmful elements contained in the selected wall paint during construction is low, the drying time of the wall paint can be shortened during construction of the interior of the building, harm to the human body can be reduced, the paint spraying device is used for paint spraying during spraying, labor input can be saved, and the construction efficiency is improved. The ventilation time can be further shortened by using the air purification device at last, and the content of indoor harmful elements can be known at any time by arranging the detection device, so that whether the decorated building can be put into use or not can be clearly and quickly known.

The invention discloses a mining flame-proof type third-level axial flow disrotatory local fan and solves the problems of the existing fan that the ventilation distance is short, the weight is large, and the efficiency of the fan is low. The mining flame-proof type third-class axial flow disrotatory local fan is characterized in that a III level cylinder body, a III level flame-proof motor and a III level impeller are added to a second-level disrotatory fan, and the I level impeller, the II level impeller and the III level impeller are all plastic impellers which are cast generally from modified polyethylene aggregates. The mining flame-proof type third-level axial flow disrotatory local fan provided by the invention can increase the pressure of the fan and the energy of air flow, and thus the long range ventilation is realized, an ultra-long length ventilation requirement of an advancing tunnel is fully and effectively ensured, meanwhile, the stable and efficient operation in a small flow region can be realized, and the application rang is wide; and a disrotatory structure is adopted and the effect of mutual reverse and equal-speed disrotatory is achieved, and the efficiency of the whole fan is improved; the plastic impellers have the characteristics of anti-static electricity, wear resistance and flame retardance, and the mining flame-proof type third-level axial flow disrotatory local fan has the advantages of good security, light weight, good aerodynamic performance, low noises, high efficiency and the like.

The invention specifically relates to a ventilation method of inclined shaft assisted double-hole construction. The ventilation method comprises the following steps: A, analyzing a pollution source and determining a ventilation standard; B, designing a ventilation system; and C, calculating tunnel ventilation parameters, selecting a fan and implementing a scheme; the ventilation system in the step B is specifically as follows: an axial-flow fan is arranged at an outer hole of an inclined shaft at an inclined shaft construction phase and a phase when inclined shaft construction is completed and a tunnel portal does not communicate with the inclined shaft, and a heading-face forced ventilation pattern is adopted with an air duct extending into a working face for ventilation; at a phase when the tunnel portal communicates with the inclined shaft, the tunnel portal is communicated with the inclined shaft and a jet flow gallery ventilation pattern is adopted, and a secure tunnel and a main tunnel both serve as air intake channels, while the inclined shaft serves as an exhaust channel. The ventilation method in the inclined shaft assisted double-track construction solves a long-distance problem that single forced ventilation fails in solving, and is high in ventilation efficiency and good in effect; moreover, the ventilation time is shortened and the construction efficiency is improved, and both electricity and air ducts can be saved; in addition, maintenance is convenient.

The invention discloses a construction method suitable for granite geological grade III surrounding rock water pressure smooth blasting. ②Blow out the residues in each blasthole by high-pressure air ③In accordance with the blasting design requirements, install the explosive coil sandwiched between the water bags in each blasthole. The safety of the electronic detonator detonation system shall be detonated in the order of blasting the slanted undercutting hole first, then the central undercutting hole, and finally blasting the auxiliary eye, the top hole, the bottom hole and the peripheral eye. , to complete the construction. The invention uses hydraulic blasting to improve the footage of surrounding rock, saves the amount of explosives, saves the ventilation time of conventional blasting, controls over and under excavation, improves construction efficiency, and saves about 8.9% of the overall cost compared with the prior art. %.

The invention discloses a pre-splitting blasting shock absorbing method, which comprises the following steps: step 1, drilling blastholes on the face of the tunnel, the outermost circle of blastholes being peripheral holes; A shock-absorbing hole is drilled between adjacent blastholes; Step 3, blowing and cleaning all blastholes; Step 4, loading explosives in all blastholes; and Step 5, blasting after confirmation is correct. The present invention can separate the rock mass plane of the excavated face part from the surrounding rock mass within a certain depth through the shock absorbing holes and the prescribed blasting sequence to form a shock isolation ditch, effectively reducing the impact of blasting on the excavated hole contour. The vibration velocity of the rock mass is improved, thereby improving the shock absorption effect.