834 results about "Conductor pipe" patented technology

The invention discloses a cast-in-place pile pouring process quality detection method capable of sensing ERT on the inner side and the outer side. The cast-in-place pile pouring process quality detection method comprises the steps that conductivity information of the inner side and the outer side of a cast-in-place pile is collected through an electrical resistance tomography electrode array arranged at the bottom of a cast-in-place pile feeding guide pipe; the two-dimensional position information of the electrical resistance tomography electrode array in the pile hole in the horizontal direction is positioned through an ultrasonic transducer array arranged at the bottom of the feeding guide pipe; the depth information of the electrical resistance tomography electrode array is acquired through an incremental encoder and a roller which move along with the feeding guide pipe in the vertical direction; transmitting the obtained conductivity information, the two-dimensional position information and the depth information to a computer imaging system to obtain a three-dimensional conductivity distribution image of the cast-in-place pile, and analyzing the obtained image to realize quality detection of the cast-in-place pile. Total cross-section imaging of concrete and a reinforcement cage can be achieved, and the positions and sizes of karst caves and collapse possibly existing in the pile hole wall can be accurately measured.

The full-coverage and full-process automatic production line comprises a feeding mechanism, a feeding cutting mechanism, a butt welding mechanism, a cold bending mechanism, a hole cutting mechanism, a transferring mechanism and a connecting plate welding mechanism, and the feeding cutting mechanism is used for cutting and chamfering the two ends of steel; the butt-joint welding mechanism is arranged between the feeding cutting mechanism and the cold bending mechanism and is used for performing butt-joint welding on the current steel and the remaining raw materials of the previous section; the cold bending mechanism carries out cold bending treatment on the steel; the hole cutting mechanism is arranged on a discharging path of the cold bending mechanism, and a guide pipe hole for loading a small guide pipe is formed in the steel; the fixed-length cutting mechanism is arranged at the output end of the hole cutting mechanism and is used for carrying out fixed-length cutting treatment; the transferring mechanism is arranged on the downstream portion of the fixed-length cutting mechanism and transfers the steel to a welding preset station, and the connecting plate welding mechanism conducts end connecting plate welding on the steel transferred in place. The automatic production line can meet the requirements of tunnel construction for steel hole sites, structural strength and batch production.

The invention relates to the field of construction tools, in particular to light foam concrete pouring and conveying equipment which structurally comprises a base, a horizontally-arranged discharging device is arranged at the top of the base, an upper cover plate is installed on the upper surface of the discharging device, a feeding pipe is arranged on one side of the upper cover plate, and the discharging device comprises a guide pipe and a buffer. The buffer is connected with a feeding hopper, the feeding hopper and a bottom pipe at the bottom form a groove body, a rotary feeding rod is arranged in the buffer and the bottom pipe, the feeding rod is connected with a driving motor main shaft installed outside the feeding hopper, the synchronous motor drives the middle pipe to rotate, and the synchronous motor is electrically connected with a driving motor main board. The long-distance conveying capacity of foam concrete is achieved, defoaming in the start-stop process is greatly reduced, the effective pushing torque of the feeding rod is concentrated in the axial conveying direction by means of the segmented design of the pre-conveying section and the conveying section of the feeding rod and the radial limiting effect of the buffer, radial overflow of materials is restrained, and damage to foam caused by radial shearing is reduced.

The invention provides an offshore wind power jacket prefabricated joint structure and a construction method thereof. The offshore wind power jacket prefabricated joint structure comprises a main pipe, a branch pipe, a main pipe connecting part and a branch pipe connecting part. The main pipe comprises a main pipe outer steel pipe and a main pipe inner steel pipe which are coaxially sleeved; concrete is filled between the main pipe outer steel pipe and the main pipe inner steel pipe to form a main pipe concrete interlayer; the branch pipe comprises a branch pipe outer steel pipe and a branch pipe inner steel pipe which are coaxially sleeved, and concrete is filled between the branch pipe outer steel pipe and the branch pipe inner steel pipe to form a branch pipe concrete interlayer; one end of the branch pipe is connected to the side wall of the main pipe, and the other end of the branch pipe is connected with the jacket inclined strut through the branch pipe connecting part; a first grouting partition plate and a second grouting partition plate are connected between the main pipe outer steel pipe and the main pipe inner steel pipe. A third grouting partition plate is connected between the branch pipe outer steel pipe and the branch pipe inner steel pipe. The anti-fatigue performance of the joint is improved, the influence of stress concentration is weakened, and then the stability and durability of the jacket foundation are enhanced.

The invention relates to the field of underground engineering construction, and discloses a hole wall cleaning device for rapid hole sealing after coal mining and a hole sealing method.The hole wall cleaning device comprises two guide pipes, each guide pipe is provided with a rear plug located at an opening of the hole wall for sealing, the two rear plugs are both arranged on the right side of the guide pipe, and a wooden plug head is detachably installed at one end of one guide pipe; one end of the other guide pipe is fixedly connected with a tamping head, the other end of the other guide pipe is slidably or fixedly connected with a pulling end, the water pumping pipe extends to the left end of the guide pipe and is communicated with an opening for draining water, and a water conveying pipe is slidably arranged in the guide pipe and extends into the cleaning assembly. After the straight sleeve and the rotating sleeve move in one direction through water supply of the water supply pipe, the other face is blocked by the adjusting sleeve through impact, the inner wall of the adjusting sleeve is hung through the scraping ring, and the effects of washing the inner wall and moving the cleaning sleeve are achieved through the inclined spray head and the rotating sleeve in use.

A system includes a tubular disposed inside of the casing that includes an inner circumferential surface delineating a conduit, an external circumferential surface, a first end, and a second end located uphole from the first end in the well. The system also includes a slip disposed circumferentially around the external circumferential surface of the tubular configured to grip an inner surface of the casing. The system also includes an expansion subassembly configured to expand radially when activated and expand an area of the tubular around the expansion subassembly from the initial outer diameter to a final outer diameter. The system also includes a string that extends from a surface location through the conduit of the tubular to the expansion subassembly and configured to pull the expansion subassembly up-hole.

This utility model discloses a ball mill that allows material feeding and discharging without stopping the machine. It includes a drum driven by a motor and its reducer, with a main feed inlet on the side of the drum and a control valve thereon; at least one auxiliary feed inlet on the end face of the drum; a fixed outer tube; and an inner tube installed at the center of the drum's end face and rotating synchronously with the drum. The inner tube contains a centrally located main feed channel and peripheral auxiliary feed channels arranged side-by-side. The inner end of the main feed channel is connected to the drum's inner cavity via a main feed guide pipe and a main feed inlet, while the outer end of the main feed channel is connected to the outer tube along the inner tube's axial direction via a first rotary joint. The inner end of the auxiliary feed channels is connected to the drum's inner cavity via an auxiliary feed guide pipe and an auxiliary feed inlet, while the outer end of the auxiliary feed channels is connected to an auxiliary feed inlet / outlet pipe along the inner tube's radial direction via a second rotary joint. This design ensures smooth feeding and discharging of both main and auxiliary materials in the drum without stopping the machine; prevents material leakage during high-speed drum rotation; and improves the ball mill's applicability and production efficiency.

The invention provides a method, a system and equipment for evaluating fatigue performance of an inner ring rib steel pipe concrete joint. The method comprises the following steps: calculating structural geometric parameters of the jacket foundation according to an ultimate load condition; obtaining a fatigue load time history curve through load simulation based on the parameters; a node hot spot stress cycle amplitude is obtained through finite element analysis; and finally, calculating fatigue accumulated damage through an S-N curve specially fitted for the inner ring rib steel pipe concrete node, and performing evaluation. The method can solve the technical problems that an existing fatigue evaluation method does not consider the specific structure, material and process characteristics of the inner ring rib steel pipe concrete joint, so that the evaluation result discreteness is large, the accuracy is insufficient, and the requirement for accurate evaluation of the fatigue life of the complex space joint of the offshore wind turbine generator is difficult to meet.

The invention relates to the technical field of grouting, in particular to a multifunctional gradient grouting device and a grouting method. The multifunctional gradient grouting device comprises a grouting assembly and a mud jacking assembly, the grouting assembly comprises a grouting pipe, a grouting zoning mechanism, a plurality of annular mud blocking plugs and a plurality of grouting guide pipes, the grouting zoning mechanism is arranged in the grouting pipe, the interior of the grouting pipe is divided into a plurality of grouting channels extending in the length direction of the grouting pipe through the grouting zoning mechanism, and the annular mud blocking plugs are arranged in the grouting channels. And a plurality of grouting hole groups are formed in the peripheral surface of the grouting pipe. The multifunctional gradient grouting device integrates multiple functions, solves the problems that an existing grouting mode is single in grouting type and pressure, and can achieve simultaneous grouting, segmented grouting, layered grouting and gradient grouting of multiple types of grout under multiple pressures so as to repair cracks of an injected body in a targeted mode, reinforce and modify the injected body, improve the grouting efficiency and improve the grouting quality. And a'deep and shallow hole high-low pressure grouting 'process can be realized at the same time, procedures can be simplified, the construction cost is reduced, and the construction efficiency is improved.

The invention discloses an offshore wind turbine split type jacket foundation structure and an oblique insertion type grouting connection method. The offshore wind turbine split type jacket foundation structure comprises a lower jacket, and a suction pile is fixed to the bottom of the lower jacket; a tower drum is mounted at the top of the upper jacket, and the upper jacket and the lower jacket are connected through oblique insertion type grouting; the inserting tip comprises a connecting steel pipe, the top end of the connecting steel pipe extends into the upper jacket, the bottom end of the connecting steel pipe is inserted into the lower jacket, a sealer is arranged at the bottom of the connecting steel pipe, a first grouting cavity is formed between the top of the lower jacket and the sealer, and a second grouting cavity is formed between the bottom of the upper jacket and the top of the connecting steel pipe; the positioning assembly is arranged between the upper jacket and the lower jacket; a fixing assembly is installed on the connecting steel pipe. The jacket is designed into a split type, so that the performance requirements of manufacturing, transportation, hoisting and the like on ship machine equipment are greatly reduced, and the jacket foundation can be conveniently applied to deep and far sea areas.

The application provides a multi-wire feeding device and method for multi-layer multi-pass welding seam structure and element regulation, and relates to the field of welding.The device comprises a wire feeding front end shell, a secondary wire guide disc, a wire feeding guide pipe, a tertiary wire guide disc, a wire feeding middle section shell and a clamping shell; the wire feeding front end shell is composed of a wire guide front nozzle, a wire guide cone and a primary wire guide disc; the wire feeding guide pipe is connected with the secondary wire guide disc and passes through the tertiary wire guide disc, and the tail end port of the wire feeding guide pipe is connected with a wire guide wheel group circular middle joint; the wire guide wheel group is composed of two wire guide wheel groups and a motor, and the motor is controlled by a control device to realize wire feeding and wire withdrawal by controlling the forward and reverse rotation of the motor.The method uses different component welding wires in one welding process to realize the regulation of the structure and elements in the welding process.The application improves the problems of uneven welding seam structure, grain coarsening and element burning loss in multi-layer multi-pass welding, and improves the performance of the multi-layer multi-pass welding seam.

The invention discloses a shield tunnel double-area synchronous grouting control system and method. The system comprises a first main pipeline and a second main pipeline, the first main pipeline comprises a first grouting pipeline and a first grout supplementing pipeline; the second main pipeline comprises a second grouting pipeline and a second grout supplementing pipeline; the first grouting pipeline and the second grouting pipeline are connected with a shield tail grouting guide pipe of the shield tunneling machine, and single-slurry synchronous grouting is conducted when the shield tunneling machine conducts tunneling; and the first slurry supplementing pipeline and the second slurry supplementing pipeline are connected with grouting holes in a shield tail segment of the shield tunneling machine, and double-slurry synchronous secondary slurry supplementing is conducted during tunneling of the shield tunneling machine till the pressure of the slurry supplementing pipelines reaches a preset pressure threshold value. Through the design of double-area synchronous operation, the single-ring grouting time is effectively shortened, meanwhile, the grouting fullness is improved, double-liquid slurry is rapidly solidified, floating of the duct piece is effectively controlled, the problem of hysteresis of filling slurry behind the duct piece wall in a traditional grouting mode is solved, and the method is widely applied to the shield construction technology.

The invention relates to an automatic wire threading method and device for reciprocating wire cut electrical discharge machining. The automatic wire threading device comprises a pretreatment part, an upper wire guide part, a lower wire guide part and a signal trigger, the pretreatment part straightens and cuts off the front section of the electrode wire, the upper wire guide part comprises a first sensor and a hydraulic wire conveying piece, and the first sensor is used for detecting the starting point position of a wire head of the electrode wire; the guide pipe assembly is provided with a second wire guide path, the axis of the second wire guide path is tangent to the wire storage barrel at the first position, and an outlet of the second wire guide path is adjacent to or abuts against the wire clamping mechanism on one side of the wire storage barrel at the second position. And the signal trigger is positioned between the outlet of the second wire guide path and the wire clamping mechanism. According to the automatic wire threading device, wire threading of the electrode wire is achieved, the operation difficulty is lowered, the personnel intervention degree is lowered, and the wire threading efficiency is improved.

The utility model relates to a multifunctional integrated flying shear turning device, which relates to the technical field of high-speed wire rod production, aims to solve the problem of possibility of steel suffocation of flying shears, and comprises a turning device mechanism, a flying shear mechanism and a discharging mechanism which are sequentially arranged, the turning device mechanism comprises a turning device guide pipe, a guide pipe stroke frame, a guide pipe driving shaft and a guide pipe fixing frame, the guide pipe driving shaft is connected to the guide pipe fixing frame, the guide pipe stroke frame is arranged at the middle section position of the guide pipe driving shaft, and the turning device guide pipe is connected to the output end of the guide pipe driving shaft. The turning device guide pipe is arranged in the direction of the flying shear mechanism, a guide pipe tip device is arranged at the end of the turning device guide pipe, a guide pipe baffle is arranged at the bottom of the turning device guide pipe and extends in the direction of the discharging mechanism, and a waste hopper used for collecting waste is arranged at an inlet of the discharging mechanism. According to the invention, the situation of steel suffocation caused by short ends is reduced, and the equipment failure rate is reduced.

The invention discloses a near-driving working face high-pressure hydraulic fracturing advanced pressure relief anti-scour device which comprises a fracturing pipe, a plurality of fracturing holes are formed in the pipe wall of the fracturing pipe, a sealing bag frame used for separating the adjacent fracturing holes is further arranged on the outer wall of the fracturing pipe, a first inner guide pipe is installed on the inner wall of the fracturing pipe through a first through-flow ring frame, and self-adaptive fracturing nozzles are arranged in the fracturing holes; an oscillation mechanism is arranged on the outer wall of the inner conduit I; the perforation pipe is connected with the pipe cavity of the inner guide pipe I, a plurality of jet flow holes are formed in the pipe wall of the perforation pipe, and a temporary blocking mechanism for separating adjacent jet flow holes is further arranged on the outer wall of the perforation pipe.

The utility model discloses a kind of steel wire surface coating machines, belong to coating machine technical field, including box, the front end surface of box is rotatably provided with swing door, surface of swing door is through and is provided with air hole, the inside fixed setting of air hole has first filter screen, the left side top of box is fixedly installed with control panel, the inside of box is sequentially provided with coating cavity, heat treatment cavity and cold treatment cavity from left to right by multiple partition plates, second guide hole is communicated and is opened between coating cavity and heat treatment cavity.The utility model through the structural design of first filter screen, air hole, second filter screen, through slot, fan, support plate, third filter screen, fixed cavity, air pump, pipe, spray head, air inlet, heating block, fourth filter screen and air outlet, can be realized to be convenient for steel wire to be heated and dried, it can be realized to be convenient for steel wire after heat drying treatment to be cold treated simultaneously, so heat stress can be eliminated, and then the overall quality and durability of coating are improved.

The present disclosure relates to a leakage current induction conduit and an electric shock prevention device including the same. According to the present disclosure, a leakage current induction conduit through which a cable passes includes a first leakage current induction pipe section formed as a tubular component made of an insulating material; a first leakage current induction body section provided in the first leakage current induction pipe section, and configured to transmit, when leakage current occurs, leakage current to a second leakage current induction body section; a second leakage current induction pipe section provided at one end of the first leakage current induction pipe section, and formed as a tubular component made of an insulating material; and the second leakage current induction body section provided on the second leakage current induction pipe section, and configured to be connected to the first leakage current induction body section.

The utility model relates to the technical field of building construction, in particular to a quick pressure relief device for a drilled pile after secondary hole cleaning of a positive circulation guide pipe, which comprises a pressure relief ball, a connecting pipe and a fan-shaped part, the plurality of connecting pipes are directly or indirectly hinged in the circumferential direction of the pressure relief ball; the fan-shaped part is arranged in a fan-shaped space between the connecting pipes; and the two side edges of the fan-shaped part are fixedly connected with the connecting pipe. A rolling ball is arranged at the end, away from the pressure relief ball, of the connecting pipe. The rolling balls abut against the inner wall of the pile hole. The device further comprises a hoisting mechanism. The hoisting mechanism is arranged above the guide pipe; a connecting arm is arranged below the hoisting mechanism and hinged to the connecting pipe. When the device is not used, the device can be folded like an umbrella, namely the waterproof cloth is folded. When in use, the device is hoisted into the guide pipe through the electric winch at the orifice position.

The invention relates to the technical field of municipal engineering, in particular to a construction method for quickly forming a small-caliber hole in a reinforced concrete retaining structure based on a pipe jacking method, which comprises the steps of processing a steel water tank, combining and processing a reinforcement cage and the steel water tank, installing the reinforcement cage, installing a guide pipe, filling pile body concrete, digging the hole after excavation, constructing and reinforcing a ring beam and the like. According to the construction method, by optimizing the pile foundation construction technology and adopting the mode that the steel water tank and the reinforcement cage are combined and poured on site, the hole opening difficulty is greatly reduced, the pile chiseling time is greatly shortened, instability caused by disturbance of a pile body is effectively prevented, the overall stability of an enclosure structure is ensured, and the construction efficiency and safety are improved; and the device is effectively suitable for various municipal engineering small-caliber pipe jacking method construction.

The utility model belongs to the wire rod technology field's wire rod wire bar machine entrance curved guide pipe structure. Including curved guide pipe (1), scratchproof guide pulley (2) and connecting piece (3), curved guide pipe (1) import end is close to pinch roll group (4), curved guide pipe (1) export end upper portion sets up connecting piece (3), connecting piece (3) connects scratchproof guide pulley (2), and scratchproof guide pulley (2) is the movable runner. The utility model discloses the wire rod wire bar machine entrance curved guide pipe structure, simple structure can effectively solve the problem that wire rod and curved guide pipe export end rub and cause curved guide pipe damage and wire rod surface scratch, improve the guide pipe life, improve wire rod surface quality, simple structure, convenient maintenance replacement, curved guide pipe life improvement can reduce the downtime influence time, save the cost.

The utility model provides a liquid storage device and a compressor. The liquid storage device comprises a shell, a liquid inlet and a liquid outlet, the protruding part is arranged on the shell, and the protruding part is provided with a mounting channel communicated with the interior of the shell; one end of the guide pipe is arranged in the mounting channel, the other end of the guide pipe is located outside the shell, a mounting gap is formed between the peripheral face of the guide pipe and the inner wall face of the mounting channel, and the mounting gap close to one end of the guide pipe is smaller than the mounting gap close to the other end of the guide pipe. According to the liquid storage device provided by the invention, the mounting gap can be gradually increased or suddenly increased from one end of the guide pipe to the other end of the guide pipe, so that a connecting structure or a connecting piece can be arranged in the large mounting gap, and even if the guide pipe deviates towards one side, a sufficient laying space can be provided for a welding strip or a welding flux; and therefore, the welding strength is effectively improved, the pressure resistance value of the liquid storage device is increased, and the stability and reliability of the liquid storage device in the using process are ensured.

The present application relates to a kind of complex water level geological conditions under booster station jacket foundation construction method, belong to marine wind power engineering technical field.The method solves in deep water, torrent, hard seabed environment, booster station jacket foundation construction is prone to structural tilt due to environmental load, and the problem that stability is insufficient and construction precision is difficult to control.The method includes: stress analysis to jacket, calculate total overturning moment and carry out stability judgment;Submarine pre-investigation and leveling;Using GPS and cable wind rope cooperation, complete accurate installation and pre-leveling of jacket;According to specific order, steel pipe pile is inserted and sunk, and pile body stress real-time monitoring and energy dynamic control are implemented during sinking process;Jacket leveling is fixed, annular space grouting and pile top cutting are carried out.The method is mainly used for the safe, efficient construction of offshore wind farm booster station jacket foundation under complex hydrogeological conditions.

The invention discloses a spherical corrugated pipe type large-angle high-pressure universal joint, and relates to the technical field of aircraft high-pressure guide pipes. In order to solve the problems that an existing flexible joint is small in compensation angle, limited in pressure resistance and poor in vibration resistance and fatigue reliability, the following technical scheme is provided: the flexible joint comprises a spherical corrugated pipe, outer cylinders symmetrically sleeve the two ends of the outer side of the spherical corrugated pipe, connecting rings are arranged on the outer cylinders, and welding rings are movably connected to the two ends of the spherical corrugated pipe; according to the high-pressure high-temperature compensation device, the high-pressure high-temperature compensation device not only can work in a high-pressure environment, but also can have large-angle compensation capacity, meanwhile, the high-pressure high-temperature compensation device is compact in structure and good in vibration resistance and fatigue resistance, adopts an all-metal structure and is resistant to high temperature, and the maintenance rate is reduced.

The invention belongs to the technical field of cast-in-place pile hole collapse prevention, and particularly relates to a silt layer self-balancing hole collapse prevention cast-in-place pile structure which comprises a reinforcement cage and a pile casing, the pile casing is detachably installed at an opening of a cast-in-place pile hole, and the reinforcement cage penetrates through an inner cavity of the pile casing and makes contact with the bottom of the inner cavity of the cast-in-place pile hole. The fixing part is detachably mounted at the top of the reinforcement cage, and the top of the reinforcement cage mounted closest to an opening of a cast-in-place pile hole can be continuously pressed through the fixing part; the adjusting part is arranged outside the fixing part, and the position of the reinforcement cage can be adjusted in time through the adjusting part, so that the central axis of the reinforcement cage coincides with the central axis of the cast-in-place pile hole all the time. According to the concrete foundation pile, through mutual cooperation of the parts, stirrup deformation and main reinforcement bending of the reinforcement cage caused by collapse of a silt layer during concrete pouring can be avoided, the bearing capacity of the built concrete foundation pile is guaranteed, and meanwhile the influence on lifting of the guide pipe and normal construction of a cast-in-place pile hole is avoided.

The invention relates to the technical field of steel surface coating, and discloses an anti-rust coating spraying device in the steel production process, which comprises a material conveying table, steel is borne on the material conveying table, the material conveying table is used for conveying the steel, a coating spraying main machine is arranged on the left side of the material conveying table, and a coating storage tank is mounted at the top of the coating spraying main machine; a paint spraying guide pipe is arranged outside the paint spraying main machine, the top of the paint spraying guide pipe is fixedly connected with an air pump, an air pressure flow dividing pipe is arranged outside the paint spraying main machine, the air pump is communicated with the air pressure flow dividing pipe, and the air pump is used for conveying compressed air to the air pressure flow dividing pipe. Through synchronization of power and operation, vibration self-adaptive regulation and control can be achieved, meanwhile, nozzle skinning and blocking can be avoided, the non-planned shutdown frequency is reduced, continuous and stable operation of a steel spraying production line is guaranteed, large particle splashing is restrained, the paint film forming quality is improved, and it is guaranteed that the paint film thickness is uniform.

The utility model relates to a guide pipe winding device which is used for achieving the technical purposes of automatic pipe winding and accurate adjustment of winding specifications. The device comprises a pipe supplying mechanism, a winding mechanism, a pipe clamping assembly and a transferring assembly. The pipe supply mechanism achieves continuous pipe supply through a guide piece, a first pipe finger clamp and a pipe cutting assembly, a pipe cutting translation air cylinder drives a pipe cutting guide piece to move, and it is ensured that the cut-off pipe keeps the clamping length. The winding mechanism is composed of a rotating disc, two sets of winding columns and a stroke controller, and a push rod is accurately controlled to ascend and descend through a servo driving module. The transferring assembly drives the pipe clamping assembly and the pipe coiling clamping assembly to move pipes cooperatively, and the pipe clamping assembly clamps a guide pipe through a lifting pipe clamping air cylinder and transfers the guide pipe to a coiling station. According to the device, automatic feeding, precise winding and damage prevention design are integrated, and the production flexibility and efficiency are remarkably improved.

The application discloses a kind of long big tunnel utilizes short step to carry out the rapid construction method of full section, comprising the following steps: S1: by excavator, site is simultaneously flattened, and the wind pipe, water pipe of excavation face is installed in place, and the illumination equipment of face is normal;S2: the excavation height of upper step is 7-8 meters, the excavation height of lower step is 3-3.5 meters, and upper and lower steps are staggered for 8-12 meters, and lower step is staggered 3-5 meters on left and right sides, and upper and lower steps are synchronously advanced;S3: by excavator, hole residue of upper step is scooped to lower step, then residue is discharged in lower step;S4: after section inspection is qualified, according to the order of lower step first and then upper step, initial spraying closure is sequentially completed;S5: after initial spraying is completed, upper and lower steps are simultaneously constructed, and finally, according to the order of lower step first and then upper step, secondary spraying concrete closure is sequentially completed.Not only the tunnel safety management level is improved, and safety risk is reduced, but also the tunnel construction efficiency is improved.

The utility model discloses a total oxygen heating furnace water cooling burner cooling device which comprises a burner, a connecting flange and a guide pipe, the outer wall of the burner is fixedly connected with a first fixing ring and a second fixing ring respectively, one side of the first fixing ring is fixedly connected with an inner ring, the outer wall of the inner ring is provided with a positioning groove, and the outer wall of the inner ring is provided with a second fixing ring. A water cooling coil pipe is installed on the outer wall of the burner, a water outlet of the water cooling coil pipe is fixedly connected with a water outlet pipe, the outer wall of the inner ring is movably connected with an upper connecting cover and a lower connecting cover, a through groove is formed in the outer wall of the upper connecting cover, and the upper connecting cover and the lower connecting cover are arranged to be of a split structure to be installed outside the burner. And therefore, the upper connecting cover and the lower connecting cover can be sequentially disassembled during disassembly and maintenance in the later period, the situation that disassembly and assembly between structures are inconvenient and tedious due to a welding or bolt installation mode is avoided, the convenience of maintenance work is further improved, and the problem that disassembly and assembly are inconvenient at present is solved through the device.

By adding infiltration injection to the conventional high-pressure grouting method, it becomes possible to form large-diameter solidified bodies using suspended grout. Furthermore, it is possible to add injection material to excavated soil and reinject it, enabling ground improvement that is environmentally friendly and reduces CO2 emissions, while also providing a ground improvement method and injection device that can form larger solidified bodies that are lighter than conventional methods. [Solution] An injection device used in a high-pressure jet mixing method, comprising a guide pipe inserted into the ground, an injection inner pipe placed inside the guide pipe and used for injecting the injection material, and an opening / closing mechanism for opening or closing the space between the guide pipe and the injection inner pipe.