564 results about "Conductor pipe" patented technology

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 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 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 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 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.

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.

The utility model belongs to the technical field of detection equipment, and particularly relates to a tubular product external pressure test tool. Comprising an outer box body which surrounds the sample pipe and is provided with a spacing part between the outer box body and the sample pipe; the supporting part comprises a first end connected with the outer surface of the sample pipe and a second end connected with the outer box body; the supporting part is used for positioning the sample pipe so as to maintain the spacing distance between the outer surface of the sample pipe and the outer box body; the packaging part, the outer box body and the outer surface of the sample pipe are matched to form at least part of the inner contour of the spacing part; and the guide pipe is arranged on the outer box body or the packaging part, and the spacing part is communicated to the voltage withstanding test equipment through the guide pipe. The device is a pipe external pressure test tool which can be matched with internal pressure test equipment, is good in compatibility with the internal pressure test equipment, is easy to obtain materials, is simple in installation mode, and has relatively low price cost and operation learning cost.

The utility model belongs to the technical field of heat exchangers, and particularly relates to a lean and rich liquid double-flow-channel heat exchanger which comprises a shell, a shell cavity is formed in the shell, and first liquid flows in the shell cavity. At least one baffle plate group is arranged in the shell cavity, the baffle plate group comprises a plurality of baffle plates, the baffle plates and the inner wall of the shell cavity are obliquely arranged, and through holes are formed in the surfaces of the baffle plates; the guide pipe is arranged in the shell cavity and penetrates through the through hole, so that the spiral cavity is formed in the guide pipe, the second liquid spirally flows in the spiral cavity, the flowing path of the second liquid in the guide pipe is increased, the heat exchange area of the second liquid in the guide pipe is increased, and therefore the heat exchange performance of the pipe side is improved. Meanwhile, the second liquid flowing spirally can generate certain centrifugal force, so that heat exchange between the second liquid and the inner wall of the guide pipe is more sufficient, and the heat exchange efficiency is further improved.

The application discloses a kind of marine wellhead casing layer-by-layer tie-in method, comprising the following steps, cutting water conductor, annulus plugging device is lowered, and annulus pressure is isolated;Remove wellhead device;Layered finishing casing, remove internal inflatable annulus plugging device;Lift the trestle;Using outer tie-in mode, tie-in oil layer casing, and carry out internal pressure test;Outer tie-in cylinder ties out technical casing, and carries out external pressure test;Using welding method, tie-in water conductor, and carry out external pressure test;Each layer casing head installation, and pressure test;Install blowout preventer;Complete wellhead tie-in.The application is aimed at the situation that water conductor, surface casing or technical casing is damaged after blowout of marine platform production well, after emergency rescue link ends, in the initial stage of platform resumption, layer-by-layer tie-in operation is carried out on wellhead casing, overall method is simple, strong feasibility, short construction period, can cope with a variety of complex situations.

The application relates to an aluminum alloy cable and a preparation method thereof, the aluminum alloy cable comprises, from inside to outside, an aluminum alloy conductor pipe, an insulation layer, a shielding layer and an outer protective layer which are sequentially arranged; the material of the aluminum alloy conductor pipe comprises aluminum, a rare earth metal, iron, copper and magnesium; the aluminum alloy conductor pipe comprises the rare earth metal 0.1-0.5%, the iron 0.5-1.8%, the copper 0.15-0.3% and the magnesium 0.01-0.05% according to 100% of the mass fraction of the aluminum alloy conductor pipe. The application limits the material of the aluminum alloy conductor pipe in the aluminum alloy cable, and specifically limits the mass fraction of each material in the aluminum alloy conductor pipe, so that the mechanical strength of the aluminum alloy cable is improved, and the fatigue resistance and the service life under the vibration working condition of the aluminum alloy cable are improved.

The application relates to a water guide wall with controllable permeability, and belongs to the technical field of water guide walls.The water guide wall is composed of a rubber ring, a guide pipe, a double-layer porous steel plate, a rubber bag and a controller for controlling water pressure in the rubber bag, a plurality of holes are formed in the double-layer porous steel plate, the inner walls of the holes are provided with the rubber rings, one rubber bag is arranged in each hole, the two rubber bags are connected by the guide pipe, the rubber bags in the double-layer porous steel plate are connected in series by the guide pipe to form a dragon, and the controller for controlling water pressure in the rubber bag is connected to the head and tail of the dragon.The holes in the steel plate are filled and the holes have gaps by controlling the expansion and contraction of the rubber bags, so that the switching of water blocking and water permeation of the wall body is realized.The water guide wall can be used as a permeable reaction wall supporting structure to replace the existing steel sheet pile technology, and can be switched between water permeation and water blocking after use, so that the application scenarios are more abundant.

The invention provides a myriameter deep well pipe column structure and a design and construction method thereof. The myriameter deep well pipe column structure comprises a well bore structure, and the well bore structure sequentially comprises a guide pipe, a technical casing, a technical tail pipe and a production casing from top to bottom; the high-strength drilling tool assembly sequentially comprises a drill rod assembly, a drill collar assembly, a drilling tool check valve and a drill bit from top to bottom; wherein the drill collar assembly comprises a plurality of conventional drill collars and non-magnetic drill collars, and centralizers are arranged between the conventional drill collars and the non-magnetic drill collars. According to the myriameter deep well pipe column structure, casing pipe layers are matched according to stratum characteristics, compared with the prior art, the casing pipe layers are reduced, and the grading pipe column structure resistant to high temperature and high pressure and high in safety redundancy is designed; and a high-strength drilling tool combination and a matched anti-failure process are developed, and the fracture risk of the drill column is reduced. According to the design method and the construction method, fine pressure control and well body quality control technologies are integrated, and safe drilling of a complex stratum is achieved; and a well cementation and well completion integrated scheme suitable for myriameter-level well depth is provided.

The invention discloses a construction method for preventing aggregate segregation of a full-pile-casing rotary excavating cast-in-place pile. The construction method comprises the following steps that a temporary pile casing is driven in; after the hole is formed, the reinforcement cage, the disturbance ball and the guide pipe are all placed in the temporary pile casing; concrete is poured into a hole formed by the temporary pile casing through the guide pipe; the temporary pile casing is lifted by the driving and pulling machine; after the temporary pile casing is lifted to a certain height, the pile casing body is driven to be lifted through the connecting rope; when the pile casing cap and the pile casing body are pulled out and exceed the ground by a certain distance, the disturbance ball is connected with the pile casing body; and the disturbance ball ascends along with the temporary pile casing, moves upwards relative to the concrete and disturbs the concrete fluid. According to the construction method for preventing aggregate segregation of the full-pile-casing rotary excavating cast-in-place pile, the concrete segregation phenomenon can be reduced.

An apparatus for severing a conduit in the borehole includes a combustible fuel; a nozzle section comprising a cavity with apertures providing passages from the cavity to outside the apparatus; a movable swirl generator located between the combustible fuel and the nozzle section, the swirl generator comprising: a piston and a plurality of helical vanes, the piston located initially above the apertures; and an activation device for igniting the combustible fuel for creating a matrix of combustion products that pass between and / or along the helical vanes and move the swirl generator in the cavity so that the piston is moved below the apertures for passage of the matrix of combustion products into the cavity and out of the apertures. The helical vanes rotate the matrix of combustion products and direct the rotating matrix of combustion products radially through of the apertures for cutting the conduit.