36results about How to "Short engineering cycle" patented technology

The invention belongs to the technical field of underground water supply and drainage pipeline leakage repair, and particularly relates to a drainage pipeline non-excavation grouting repair construction method. According to the method, excavation does not need to be carried out, and leakage to the earth surface can be prevented. The method comprises the steps of scene investigation, positioning, internal support mounting, placement of a drilling machine and a grouting device, grout production, drilling, grouting, hole sealing, machine moving and the like. The drainage pipeline non-excavation grouting repair construction method has the advantages that a flow cross section is small in loss after repairing is carried out; the flow is basically lossless; the grouting operation is easy, and the grouting effect is easy to control; construction is easy and convenient; the construction period is short; no special equipment is needed; the engineering cost is low; the application range is wide; and in the whole repairing process, a road surface is not required to be excavated.

The invention relates to an installation method for thermal insulation and decoration integrated facade panels in the field of construction methods of the construction industry. The method includes the following steps: (Step 1) main wall surface treatment; (Step 2) datum line making; (Step 3) framing installation; (Step 4) thermal insulation and decoration integrated facade panel installation; (Step 5) gap filling; (Step 6) sealant filling; (Step 7) panel surface cleaning. When the method disclosed by the invention is adopted, integral installation is convenient, cost is reduced, the construction period is short, the load of facade panels is reduced greatly, the utilizability of space and land is enhanced, the application range is wide, temperature is kept, heat is insulated, energy consumption is reduced, structural destruction caused by the circulation of rain, snow, freezing, thawing, dryness and wetness is prevented, the worry about the water seepage of wall surfaces is eased after installation, the phenomenon that indoor wall surfaces go moldy is effectively prevented, and the thermal insulation and decoration integrated facade panels are environment-friendly and durable.

The system includes following parts: control center connected to Internet and control terminal, and through Internet, control terminal is able to connect to the control center; mobile communication network connected to Internet; communication terminal connected to mobile network wirelessly; terminal for monitoring feed line connected to communication terminal and electric devices respectively. Through Internet, control terminal sends control command to the control center. Through Internet and mobile network, the control center sends control command to communication terminal, which transfers the received command to the monitoring terminal. The monitoring terminal sends monitored state information at site of power distribution to the communication terminal, which sends the information to control center through mobile network and Internet. The control center returns the information bake to control terminal. Advantages are: short building period, easy of upgrading etc.

The invention belongs to the technical field of marshalling-station hump-yard signal equipment automation control, and discloses a novel controlling, supervising and monitoring integrated hump full-electronic automatic system. The system is of a three-stage system structure which comprises an operational layer, a monitoring layer and an executive layer. The operational layer, the monitoring layer and the executive layer are established on a computer network transmission platform, and by adopting a database technology, integrated sharing and exchanging of information are achieved. The executive layer is composed of full-electronic intelligent executive control module groups, and the functions of information collection, logical judgment, control execution, state memory, fault protection, monitoring alarm and the like are achieved. The system is provided with a maintenance monitoring machine to achieve the function of computer monitoring, the functions of fault self-diagnosis and self-recovery are achieved, and an alarm display part can be rapidly positioned to a board stage. Compared with the prior art, the system is safe and reliable, simple in structure, high in integration level, the higher in functionality, the better in expansibility and convenient to maintain, and the hump full-electronic automatic system has the intelligent characteristic and integrates controlling, supervising and monitoring.

The invention discloses an underground integrated domestic sewage treatment device and a method thereof, and belongs to the field of purification of the domestic sewage. The underground integrated domestic sewage treatment device comprises a grilling tank, an adjusting tank, an anaerobic digestion tank, an anaerobic biological filtration tank, an aerobiotic biological filtration tank I, an aerobiotic biological filtration tank II, an aerobiotic biological filtration tank III, a vertical flow sedimentation tank and a control chamber, wherein the underground integrated domestic sewage treatment device is an underground stereoscopic integrated device; the control chamber comprises an upper layer part and a lower layer part; the upper layer part is arranged at the upper part of the control chamber; an electric control box and an ultraviolet device are arranged in the upper layer part; a fan and a chemical adding device are mounted at the lower layer part. The underground integrated domestic sewage treatment device is small in occupied area, convenient in drainage and low in energy consumption; the energy conservation and environment protection are facilitated; by virtue of the auxiliary adoption of the chemical treatment process on the main basis of biological degradation, the emission of the water with the up-to-standard water quality is ensured.

The invention relates to lightweight silt foam composite soil which is characterized by comprising the following components by mass percent: 81% to 85% of raw soil as, 10.5% to 13.5% of cement as a curing agent, 2.5% to 4.5% of gypsum powder or silicon powder and 1% to 3% of lightweight materials. The invention further discloses a preparation method of the lightweight silt foam composite soil. The lightweight silt foam composite soil has the advantages of light weight, high strength, good independence, short construction period, waste recycling and environmental protection. In addition, the lightweight silt foam composite soil can solve the problems of uneven settlement and vehicle bumping at a bridge head, poor stability of a retaining wall, untight pressing of a pipe ditch, slumping of a side slope and the like due to the soil filling on a roadbed. Therefore, the lightweight silt foam composite soil is an ideal civil engineering material and can be widely applied to the construction of transportation, civil engineering and hydraulic engineering.

The invention provides a wide-area oil field infrared panoramic imaging radar reconnaissance, command and control system. The system comprises one or more control towers arranged at preset positions of an oil field working area and a monitoring center. Each control tower is equipped with an infrared surrounding scanning imaging unit which is used for carrying out horizontal 360-degree scanning on surroundings of the control tower, thereby obtaining an infrared panoramic picture; a moving target detection unit which is used for judging whether a moving target exists in the current infrared panoramic picture or not and determining measurement angle data when the moving target exists; a remote partial picture / video collection unit, wherein a servo direction of the remote partial picture / video collection unit is determined according to the measurement angle data, thereby collecting partial high-definition picture / video data; and a sending unit which is used for sending the partial high-definition picture / video data collected by the remote partial picture / video collection unit to the monitoring center in a wire or wireless mode. The technology of the invention can be used for day and night monitoring of an oil field, is high in monitoring and alarm accuracy and has the advantages that report failures are few, misinformation is little and the engineering is highly simplified.

The technology for processing wastewater generated during the brown coal upgrading process comprises the following steps: cooling the wastewater, adding a positive flocculant so as to form precipitable solid particles during the cooling process of wastewater, stirring to homogenize the water quality; adding a flocculant and a coagulant aid into the wastewater to carry out re-agglomeration after the wastewater reaches the room temperature, subjecting the wastewater to processes of separation, filtration, and adsorption so as to remove almost all micro impurities in wastewater; introducing the processed wastewater into a biological reaction tank, carrying out bio-degradation on the organic matters and nitric pollutants in the wastewater by utilizing a microorganism membrane in a biological filling material; introducing part of the water in the biological reaction tank into a membrane separation tank, withholding all biomass in the wastewater in the membrane separation tank through a membrane separating member arranged in the membrane separation tank; refluxing the water, which is held back by the membrane separating member and contains nitrifying bacteria, to the biological reaction tank; adding sodium hypochlorite into the water filtered by the membrane separating member so as to disinfect the water, and finally introducing the disinfected water into a clean water tank.

The invention discloses a method of curing a soil body through motivating and cultivating microorganism in situ. The method comprises the following steps: at first, adding motivating liquid in the soil body to promote reproduction of microorganism in the soil body, then, adding cementing liquid in the soil body to cure the soil body, and further, calculating the usage amount of the motivating liquid and / or cementing liquid added each time through the porosity, the treatment area and the treatment depth of the soil body. Through adding the motivating liquid in situ, reproduction of self microorganism in the soil body is promoted; the in-situ motivated microorganism in the soil body environment is balanced in nutrient substances, has interactive adjustment and sensing with other microorganism, grows and breeds rapidly and is high in urease activity; and in addition, the in-situ microorganism motivating method reduces the process of adding bacteria solution in the soil body, greatly reduces the influence of non-uniform solution flowing to non-uniform microorganism distribution and effectively improves the MICP effect.

The invention provides a soft soil stratum subway station expansion method and structure based on an inserted beam freezing method. The soft soil stratum subway station expansion structure comprises shield tunnels, a middle platform connected between the two parallel shield tunnels and communicating with the shield tunnels, and frozen soil layers wrapping the outer side of the middle platform; themiddle platform comprises a top lining unit, a bottom lining unit, side columns and a structural bottom plate, the top lining unit and the bottom lining unit are arranged between the shield tunnels and are symmetrical up and down, and the frozen soil layers are distributed along the arched outer surfaces of the top lining unit and the bottom lining unit; the two side ends of the bottom lining unit and the two side ends of the top lining unit are connected and supported through the side columns; and the structural bottom plate is arranged above the bottom lining unit and is kept on the same horizontal plane with the two ends of the bottom lining unit. The method solves the problem of large deformation of subways and surrounding soil caused by serious soil moving in an expansion mode, and has the advantages of being high in construction efficiency, short in construction period and high in safety.

The invention discloses a testing system of an optical fiber network, and belongs to the technical field of optical fiber communication transmission. The testing system comprises a first reference clock chip and a second reference clock chip, and further comprises a central processing unit, an optical transceiver, an FPGA, an EPROM and a JTAG debugger, wherein the first reference clock chip and the second reference clock chip are both connected with the central processing unit, the central processing unit, the EPROM, the JTAG debugger and the optical transceiver are all connected with the FPGA, and the JTAG debugger is connected with the EPROM. By means of the testing system, each module of the FPGA can be tested, configuration programs can be directly written in the EPROM, the engineering period is short, and the development can be conveniently and flexibly realized.

The invention relates to a digital multipoint distribution system and a transmission processing method thereof. According to the digital multipoint distribution system, a near-end access unit is composed of a power module, a monitor panel, a frequency conversion module, a medium frequency processing portion and a modem; a system expansion unit is composed of a power supply, a monitor panel, an interface conversion portion and a medium frequency processing portion; a system far-end unit is composed of a medium frequency portion, a frequency conversion module and a radio frequency amplifying portion. The transmission processing method of the digital multipoint distribution system is composed of the steps including system near-end unit transmission, system expansion unit transmission and system far-end transmission. The digital multipoint distribution system and the transmission processing method thereof solve the problems of incapability of achieving multiple-network common access, multiple-network coexisting interference, poor indoor telephone traffic absorption capacities and the like and has the advantages of multiple-network co-construction, resource sharing and construction investment sharing, low noise introduction, better signal coverage quality, convenient design, simple construction, energy conservation, emission reduction, operating cost reduction and the like.

The invention discloses a laser radar applied to mobile equipment and a using method thereof, and a laser radar system. The laser radar comprises a radar body, a communication module, and a housing. The radar body emits and receives a laser beam to detect a characteristic signal of a measured object. The communication module includes a wireless communication module; and the laser radar realizes information interaction of the characteristic signal with the mobile terminal through the wireless communication module. The radar body, the communication module and a power supply module are all arranged in the housing. According to the application, the laser radar is independent in physical structure and functions and carries out remote information interaction with a conventional mobile terminal through the wireless communication module and thus the user can directly and remotely regulate and control the laser radar through the mobile terminal. The operation of the laser radar is simplified and remote controlling can be realized. The laser radar can be installed on mobile equipment or installed at a specific measurement position rapidly, simply and detachably and can be installed simply and conveniently.

The invention discloses and provides a kitchen biogas slurry treatment method and device which are simple in technological process, low in equipment cost, small in agent adding amount and stable in treatment effect. The kitchen biogas slurry treatment device comprises a pre-treatment part, an MVR evaporator, a primary steam purifier and a secondary steam purifier. The pre-treatment part is connected with the water inflow end of the MVR evaporator, the MVR evaporator, the primary steam purifier and the secondary steam purifier are sequentially connected, the secondary steam purifier is connected with the MVR evaporator, and the pre-treatment part is connected with an external biogas slurry pond. The kitchen biogas slurry treatment method and device are suitable for the field of kitchen biogas slurry treatment.

The invention relates to a subway station extension method and structure based on a concrete-filled steel tube beam insertion method. The subway station extension method comprises the steps that a transverse through middle platform is built between existing bidirectional parallel shield tunnels to form an extension structure; and corresponding upper through holes and lower through holes are obliquely formed in segments of the two shield tunnels, jacking bent steel pipes are inserted from the through holes to be transversely connected to serve as external supports, a lining structure is constructed after soil is excavated on the inner side, and through connection is achieved after the segments at shield tunnel connectors are detached. Small expansion, downward storey addition and step-by-step expansion can be achieved, and the subway station extension method is suitable for expansion of subway stations with strict control over ground displacement and ground surface settlement and construction of shallow soil, soft stratums and large-span underground spaces.

The invention discloses a wireless monitoring system. The wireless monitoring system comprises multimedia nodes which are connected through a wireless network; and each multimedia node comprises a multimedia information acquisition unit for acquiring multimedia information, a multimedia information conversion unit for converting the acquired multimedia information into multimedia code streams through coding and a programmable wireless receiving and transmitting unit for detecting the network environment where the node is located and configuring protocol parameters to receive and transmit the multimedia code streams wirelessly. By means of the wireless environment self-detection, protocol programming, RF front-end dynamic configuration and baseband unit reconfigurable technologies provided by the wireless monitoring system, it can be guaranteed that the overall wireless monitoring system achieves the good system security, the signal stability, the deployment convenience, the application practicability and the flexible expansibility in the multimedia signal transmission monitoring process.

The invention relates to a wireless mobile phone building intercom access control system. A mobile phone voice calling intercom module, an RFID intelligent card access control module and an opening control module are connected with a 3G data communication management module which is connected with a real IP network server by a central data processing platform through a 3G network, and the real IP network server is connected with a property management platform, a system maintenance platform and a data memory. The wireless mobile phone building intercom access control system has the advantages that talk-back equipment at a passageway gate is only required to be installed, less hardware equipment is required, electrical energy is saved, the project cycle is short, the construction cost is low, the post maintaining workload is low, the using cost is low, and an owner can perform talkback and open the door at any place.

The invention belongs to the technical field of underground water supply and drainage pipeline leakage repair, and particularly relates to a drainage pipeline non-excavation grouting repair construction method. According to the method, excavation does not need to be carried out, and leakage to the earth surface can be prevented. The method comprises the steps of scene investigation, positioning, internal support mounting, placement of a drilling machine and a grouting device, grout production, drilling, grouting, hole sealing, machine moving and the like. The drainage pipeline non-excavation grouting repair construction method has the advantages that a flow cross section is small in loss after repairing is carried out; the flow is basically lossless; the grouting operation is easy, and the grouting effect is easy to control; construction is easy and convenient; the construction period is short; no special equipment is needed; the engineering cost is low; the application range is wide; and in the whole repairing process, a road surface is not required to be excavated.

The invention discloses an underground integrated domestic sewage treatment device and a method thereof, and belongs to the field of purification of the domestic sewage. The underground integrated domestic sewage treatment device comprises a grilling tank, an adjusting tank, an anaerobic digestion tank, an anaerobic biological filtration tank, an aerobiotic biological filtration tank I, an aerobiotic biological filtration tank II, an aerobiotic biological filtration tank III, a vertical flow sedimentation tank and a control chamber, wherein the underground integrated domestic sewage treatment device is an underground stereoscopic integrated device; the control chamber comprises an upper layer part and a lower layer part; the upper layer part is arranged at the upper part of the control chamber; an electric control box and an ultraviolet device are arranged in the upper layer part; a fan and a chemical adding device are mounted at the lower layer part. The underground integrated domestic sewage treatment device is small in occupied area, convenient in drainage and low in energy consumption; the energy conservation and environment protection are facilitated; by virtue of the auxiliary adoption of the chemical treatment process on the main basis of biological degradation, the emission of the water with the up-to-standard water quality is ensured.

The invention relates to a seven-core fireproof cable. Seven phase line cable cores coated with insulating layers constitute a cable phase line conductor. A metal shielding layer is pre-arranged in the insulating layer of each phase line cable core. The cable phase line conductor is coated with an inner sheath and an outer sheath in turn from inside to outside. A belting layer is arranged betweenthe sheaths. There is a phase-N phase line cable core in the center of the cable phase line conductor. Two sets of phase-A, phase-B and phase-C phase line cable cores are distributed uniformly, at intervals and in a staggered manner along the circumference outside the phase-N phase line cable core. A fireproof material layer fills the gaps of the phase-N phase line cable core and the two sets of phase-A, phase-B and phase-C phase line cable cores. The inner sheath is a rubber layer. The outer sheath is a stainless steel strip armored layer. The seven-core fireproof cable has high rigid supportstrength and excellent fireproof performance. Cable phase line laying required by star-triangle step-down starting can be completed at a time. The seven-core fireproof cable has the advantages of fewer accessories, short project cycle, time and labor saving, and convenient installation.

The invention discloses an evaporative condensation integrated machine with a hydraulic module. The evaporative condensation integrated machine comprises an evaporator, a compressor connected with theevaporator, an evaporative condenser, a throttling device arranged between the evaporative condenser and the evaporator, an oil separator disposed between the compressor and the evaporative condenserand a water-cooled heat exchange unit matched with the evaporator. The water-cooled heat exchange unit includes a filter device, a pump body, a medium outflow pipe, and a medium backflow pipe, wherein the medium outflow pipe and the medium backflow pipe separately communicate with the evaporator, and the filter device and the pump body are disposed on the medium outflow pipe. The evaporative condensation integrated machine is provided with own water-cooled heat exchange unit, just a chilled water pipe and a power cable need to be connected so as to be put into use, the engineering cycle is short, a refrigeration plant room is not required to be additionally arranged, the land occupation is small, and the space is saved; and moreover, the operation energy efficiency of a system can be effectively improved, and operating costs are significantly reduced.

The invention relates to a cabinet body of a low-voltage power distribution AC cabinet, which includes a cabinet body, which is divided into several chambers by partition boards, and electronic components are placed in each chamber. The cabinet body includes a cabinet frame, and the cabinet frame is opposite to The cabinet door and heat dissipation door are provided. The heat dissipation door includes a door body, a shaft sleeve, a blade shaft, a blade and a fixed casing. The blade includes a first blade and a second blade, and the first blade and the second blade are relatively attached. The blades are fixed together by bolts to form a whole blade. The blade rotating shaft passes through the bushing on one side of the door body, the blade and the bushing on the other side of the door body in turn, and is fixed on the door body by a rotating wheel. It is easy to install and disassemble, reduces the self-weight of the blade, greatly facilitates the construction personnel, has strong flexibility and adaptability, greatly improves the construction progress, and saves costs.

The invention discloses a lime-soil compaction pile and CFG rigid pile combined device and method for disposing collapsible loess. The device comprises multiple lime-soil compaction piles arranged in a collapsible loess area to be disposed, wherein CFG rigid piles are arranged in lime-soil compaction pile bodies, and the pile diameter of each lime-soil compaction pile is larger than that of each CFG rigid pile. The method comprises the steps of pre-disposing the collapsible loess area to be disposed; then arranging the lime-soil compaction piles at the designed positions, adopting an immersed tube piling machine to perform hole forming till the designed depth is reached, filling lime-soil padding into holes and using a column hammer to ram the lime-soil compaction piles in a layered mode; using a long spiral drilling machine to performing drilling in the lime-soil compaction pile bodies till the designed depth of the lime-soil compaction piles is reached, and pouring concrete in the holes to form the CFG rigid piles. The collapsible loess foundation treatment quality can be remarkably improved, engineering safety can be ensured, engineering investment can be remarkably reduced, and the lime-soil compaction pile and CFG rigid pile combined device is reasonable in design, simple in structure, safe, reliable and well-adapted.

The invention discloses a sewage lifting and treatment system which comprises a pump station, an adjusting tank, sewage treatment equipment and a sludge tank. The pump station comprises a barrel, a top cover arranged at the top end of the barrel and a base arranged at the bottom end of the barrel, the barrel is a glass fiber reinforced plastic barrel manufactured through a winding forming process, a submersible sewage pump is arranged at the top of the base, the outlet end of the submersible sewage pump communicates with the inner side end of a water outlet of the pump station through a pressure pipeline, and the water outlet of the pump station communicates with a first water inlet of the adjusting tank; the sewage treatment equipment comprises an equipment main body, a biochemical reaction tank, an MBR membrane tank and a clean water tank are sequentially arranged in the equipment main body, and a water outlet of the adjusting tank communicates with a sewage inlet of the biochemical reaction tank; and the MBR membrane tank is internally provided with an MBR membrane assembly, the water outlet end of the MBR membrane assembly is connected with a clear water outlet pipe, the clear water outlet pipe is connected with a backwashing device, the bottom of the MBR membrane tank is provided with a sludge discharge port, and the sludge discharge port communicates with the sludge inlet of the sludge tank.

The invention belongs to the technical field of marshalling-station hump-yard signal equipment automation control, and discloses a novel controlling, supervising and monitoring integrated hump full-electronic automatic system. The system is of a three-stage system structure which comprises an operational layer, a monitoring layer and an executive layer. The operational layer, the monitoring layer and the executive layer are established on a computer network transmission platform, and by adopting a database technology, integrated sharing and exchanging of information are achieved. The executive layer is composed of full-electronic intelligent executive control module groups, and the functions of information collection, logical judgment, control execution, state memory, fault protection, monitoring alarm and the like are achieved. The system is provided with a maintenance monitoring machine to achieve the function of computer monitoring, the functions of fault self-diagnosis and self-recovery are achieved, and an alarm display part can be rapidly positioned to a board stage. Compared with the prior art, the system is safe and reliable, simple in structure, high in integration level, the higher in functionality, the better in expansibility and convenient to maintain, and the hump full-electronic automatic system has the intelligent characteristic and integrates controlling, supervising and monitoring.

The invention discloses a solar energy and geothermal energy co-generation system, which consists of a solar hot air flow generation system and at least one geothermal heat pipe generation system; in the solar hot air flow generation system, a turbine generator set is arranged at the bottom of a solar chimney which is in smooth transition connection with a solar heat collection shed; the geothermal heat pipe generation system is installed below the solar heat collection shed; and in the geothermal heat pipe generation system, an evaporation cavity is in sealed connection with a condensation cavity through a tapered pipe cavity, and a generation device is installed in the condensation cavity. The invention has the advantages of simple structure, high degree of automation, effective utilization of the solar energy and geothermal energy, environment-friendly and low-cost operation and maintenance and continuous, stable and efficient generation, practically contributes to energy conservation, emissions reduction and the like, and promotes the sustainable development of cyclic economy.

The invention relates to a low-voltage AC distribution cabinet body comprising a cabinet framework. A cabinet door and a heat-dissipating door are arranged oppositely on the cabinet framework. The heat-dissipating door comprises a door body, shaft sleeves, blade rotating shafts, blades, and fixed sleeve housings. The blades comprise a first blade and a second blade which adhere to each other and which are fixed by a bolt to form a blade body. Each blade rotating shaft successively passes through the shaft sleeve on a side of the door body, the blades, and the shaft sleeve on the other side of the door body, and is fixed to the door body through a rotating wheel. The low-voltage AC distribution cabinet body is easy to install and uninstall. The weight of the blades is reduced so as to greatly contribute to constructors. Further, good flexibility and adaptability are achieved; a construction progress is accelerated; and cost is saved.

The invention relates to a 7-core fireproof cable. 7 phase line cable cores wrapped with insulating layers respectively form a cable phase line conductor; an inner sheath and an outer sheath sequentially wrap the periphery of the cable phase line conductor; a wrapping tape layer is arranged between the outer sheath and the inner sheath; an N-phase phase line cable core is arranged at the center ofthe cable phase line conductor; two sets of A-phase line cable cores, two sets of B-phase line cable cores and two sets of C-phase phase line cable cores are evenly spaced along the circumference ofthe N-phase phase line cable core; gaps among the N-phase phase line cable core, the two sets of A-phase line cable cores, the two sets of B-phase line cable cores and the two sets of C-phase phase line cable cores are filled with a fireproof material layer; the inner sheath is a rubber layer; and the outer sheath is a stainless steel strip armoring layer. The 7-core fireproof cable has the advantages of high rigid support strength, superior fireproof performance, few accessories, short engineering cycle, time-saving and labor-saving performance, and convenient installation. The 7-core fireproof cable can be laid one time, so that cable line phase laying required by star-delta step-down start can be realized.

The invention provides a method and structure for expanding a subway station on soft ground based on a beam-inserting and freezing method, which includes a shield tunnel, an intermediate platform connected between two parallel shield tunnels and communicated with the shield tunnel, and wrapped in Frozen soil layer outside the middle platform; the middle platform includes top lining unit and bottom lining unit, side columns and structural floor. The top lining unit and bottom lining unit are arranged between shield tunnels and are vertically symmetrical. The arched outer surfaces of the lining unit and the bottom lining unit are arranged; the two ends of the bottom lining unit and the top lining unit are connected and supported by side columns; the structural bottom plate is set above the bottom lining unit and kept at the same level. The invention solves the problem that the large deformation of the subway and the surrounding soil is caused by serious ground breaking in the expansion mode, and the invention has the advantages of high construction efficiency, short construction period and high safety.