1043 results about "Drill pipe" patented technology

The present application belongs to the field of coal mine, and relates to a coal mine underground orifice blowout prevention dust isolation device, which comprises, in sequence, a stamping dust isolation assembly, a gasket eccentric isolation assembly, a columnar brush array isolation assembly and a slag collecting main body, the slag collecting main body is connected with an orifice sealing pipe in a hole, and a drill rod is arranged through the stamping dust isolation assembly, the gasket eccentric isolation assembly, the columnar brush array isolation assembly and the slag collecting main body. The present application realizes the blocking of dust in the hole through the brush dust blocking of the columnar brush array isolation assembly, the eccentric dust isolation of the eccentric isolation assembly and the stamping dust isolation of the stamping dust isolation assembly, realizes the linkage control of the mechanism on the sealing assembly, and the greater the gas pressure sprayed out of the hole, the better the sealing effect of the sealing assembly, so that the safety hidden danger problem of gas spray hole in the drilling process can be effectively solved.

The utility model discloses a directional drilling unjamming device relates to directional drilling unjamming technical field, including base, be equipped with lifting assembly on the base and be located opening both sides respectively, be equipped with hammering subassembly on the base and be located opening rear, the utility model will the fixed mounting of bottom plate be in the drill rod, and make the drill rod embed in the opening and the mouth, the plug -in block is inserted into the dovetail groove through the dovetail rod at this time, the plug -in block is installed at the mouth, the first through -hole and the second through -hole are located on the same axis at this time, insert the limiting bolt into the first through -hole and the second through -hole, and the limiting nut is screwed on the limiting bolt, the upper slip body is inserted into the upper slip seat at this time, and then the drill rod is fixed, the upper slip seat is pushed through the lifting assembly, and then the upward thrust is provided to the drill rod, and the vibration force and the knocking force are provided to the upper slip seat through the hammering subassembly, and then the drill rod is unjammed.

The application discloses a kind of mine roadway surrounding rock fissure rock mass bearing capacity detection equipment with drilling, and the application relates to the technical field of coal mine drilling survey, including drill rod, one end of the drill rod is provided with comprehensive drilling bit, water inlet pipe is arranged in the drill rod, and the water inlet pipe is used to supply water to the inside of comprehensive drilling bit, the inside of the drill rod is also provided with detection mechanism, the detection mechanism includes: pressure storage tank, one side of the pressure storage tank is fixedly connected with first connecting pipe, the first connecting pipe is fixedly connected with the output end of water pump at the end away from the pressure storage tank, the present application is provided with pressure detection module, flow rate detection module and high-frequency dynamic pressure sensing module, and combined with multi-parameter synchronous acquisition and coupling analysis, the pressure decay characteristic, flow change characteristic and transient pressure response characteristic can be obtained simultaneously, so as to construct surrounding rock fissure equivalent permeation response parameter, with the advantages of realizing the continuous acquisition of surrounding rock fissure permeation characteristic and its spatial distribution.

The application discloses a soil layer moisture content real-time discrimination and regulation powder jet pile drill bit and a powder jet pile construction method, and relates to the technical field of geotechnical engineering. The drill bit comprises a drill rod, a plurality of moisture content detection units, a processor and the like. The rod wall of the drill rod is provided with a plurality of stirring blades. The plurality of moisture content detection units are arranged at different height positions of the drill rod and are used for detecting the moisture content of soil layers at different depths in real time. The upper rod wall of the drill rod is provided with a water injection port, and the lower rod wall is provided with a dust injection port. The processor is connected with the moisture content detection unit in signal and is used for adjusting the water injection pressure and the dust injection pressure according to the measured moisture content. The application can realize the moisture content regulation in the powder jet pile construction process, ensure the strength of the pile body of the powder jet pile in the soil layer with low natural moisture content, and has important significance for improving the construction quality of the powder jet pile and expanding the application range of the powder jet pile.

The invention relates to the technical field of drilling and production equipment testing tools, in particular to a drill rod bidirectional clamping high-temperature testing clamp which comprises a shell, an outer wall clamping mechanism and an inner wall clamping mechanism, and the outer wall clamping mechanism and the inner wall clamping mechanism are arranged in the shell. The outer wall clamping mechanism comprises a contraction elastic clamping sleeve and a first driving device in driving connection with the contraction elastic clamping sleeve, and the inner wall clamping mechanism comprises an expansion elastic clamping sleeve and a second driving device in driving connection with the expansion elastic clamping sleeve. The contraction elastic clamping sleeve and the expansion elastic clamping sleeve are coaxially arranged in a spaced mode, and a clamping channel used for clamping the end of the drill rod is formed between the inner wall of the contraction elastic clamping sleeve and the outer wall of the expansion elastic clamping sleeve. The first driving device can drive the contraction elastic clamping sleeve to contract in the radial direction of the clamping channel, and the contraction elastic clamping sleeve expands and resets in the radial direction of the clamping channel after being undriven; the second driving device can drive the expansion elastic clamping sleeve to expand in the radial direction of the clamping channel, and the expansion elastic clamping sleeve shrinks and resets in the radial direction of the clamping channel after being undriven.

The present application relates to the technical field of punching equipment, and discloses a street lamp pole multi-specification aperture self-adaptive positioning punching equipment, which comprises a supporting platform, further comprises: a drilling frame which is translated along the long axis direction of the supporting platform, a positioning cylinder is fixedly connected to the top of the drilling frame, a clamping frame is fixedly connected to the telescopic end of the positioning cylinder, and a clamping part for welding positioning is arranged on the clamping frame; a mounting plate is fixedly connected to the bottom of the clamping frame; the present application realizes accurate longitudinal positioning of the drilling frame by cooperation of a shifting motor and a reciprocating screw rod, realizes self-adaptive rigid clamping of street lamp poles with different diameters by the positioning cylinder and the arc-shaped clamping plate, ensures the processing stability, adopts a tapered drill rod with a small upper end and a large lower end, cooperates with a distance measuring sensor to realize real-time feedback, realizes multi-specification aperture processing by a single drill bit through accurate control of the pressing depth, does not need to frequently change tools, significantly improves the adaptability and drilling efficiency of the equipment, avoids idle stroke impact, and protects the drill rod and the workpiece.

The present application relates to the technical field of drilling, and discloses a mountain drilling machine, which comprises support parts arranged symmetrically, a connecting part arranged between the two support parts, a motor one arranged below the connecting part and a drill rod connected to the output end of the motor one, and a supporting mechanism, which comprises guide rails slidingly inserted into the bottom ends of the support parts and used for adjusting the positions of the support parts, bases arranged below the two ends of the guide rails and used for supporting the guide rails, and a plurality of inserting rods fixed to the bottom side of the base and used for fixing the position of the base, and the connecting part is provided with an adjusting mechanism used for adjusting the angle of the drill rod. The position of the drill rod of the drilling machine can be adjusted according to the punching coordinate point, so that the drilling operation of the punching coordinate point can be quickly performed, the angle of the drill rod can be flexibly adjusted, the flexibility is high, the mountain drilling machine can be adaptively controlled according to the construction environment, so that the construction personnel can conveniently install the mountain drilling machine in the complex construction environment, and the working performance is good.

The application relates to the field of geological re-prospecting coring, in particular to a multi-tube-line site karst broken stratum multi-set-tube coring method and device, which comprises the following steps: determining a lofting drilling point position, fixing a hole punching and coring device; installing a first coring casing and a first drill bit on the hole punching and coring device, punching and coring a concrete layer and a soil layer located on a municipal road; installing a second coring casing and a second drill rod with a second drill bit on the hole punching and coring device, inserting a first metal wire into the second drill rod to the bottom of the second drill bit or clamping the first metal wire on the side of the second drill bit, punching a broken rock layer located below the soil layer until water gushing occurs and then coring; installing a third drill rod with a third drill bit on the hole punching and coring device, inserting a second metal wire into the third drill rod to the bottom of the third drill bit or clamping the second metal wire on the side of the third drill bit, and punching a fully strong weathered rock layer located below the broken rock layer. The application has the effect that coring can be completed in different strata.

The utility model relates to drilling platform mud sewage treatment technical field especially, more particularly to a kind of mud sewage collector. Including communication pipe, the inside of communication pipe is provided with drill rod, the arc surface of communication pipe is provided with collection device, collection device includes mud collection subassembly, sewage collection subassembly, filter component and fixed component, mud collection subassembly is set in the upper end arc surface of communication pipe, sewage collection subassembly is set in the bottom end arc surface of communication pipe, filter component is set in the upper end inner wall of communication pipe, communication pipe is set with the collection umbrella cloth of mud collection subassembly and the position of sewage collection subassembly, mud collection device includes mud fixed frame and mud butt joint frame, the arc surface of the inner wall of mud fixed frame and mud butt joint frame and connecting pipe is abutted, the both end surface of mud fixed frame and mud butt joint frame is fixedly connected by means of fixed component. The mud sewage collector provided in the utility model has the advantage that mud sewage in well drilling operation is effectively separated.

This utility model discloses a directional drilling structure, including a square tube with symmetrically arranged strip-shaped grooves on its sidewalls. Drilling structures are installed within these grooves, and the outer sides of the two drilling structures are fixedly connected to the inner wall of the square tube. During directional drilling, the drilling structures provide orientation, while simultaneously providing clamping force via hydraulic cylinders. These structures also have a spacing adjustment function, ensuring smooth rotation while clamping the drill rod. When the drill rod needs to be removed, a servo motor is installed. The servo motor provides power to the arc-shaped rotating roller, assisting in the upward removal of the drill rod and providing stable drilling guidance. It also provides sufficient limiting to avoid difficulties in drilling bare holes. During directional drilling, an annular plate is also installed at the top of the square tube to limit the top of the drill rod, ensuring it is centered and that the directional drilling proceeds in the designed direction.

This invention relates to a high-efficiency drilling device for cable tray processing, comprising a support base, a positioning plate, and a drilling machine; the inner edge of the positioning plate is provided with parallelly distributed limiting plates and flexible plates, and a hinge frame is provided between the limiting plates and the flexible plates; when the drilling machine descends to drill a hole in the cable tray, the rack descends with the drilling machine and inserts into channel three; when the flexible plate is in contact with the cable tray, the drill bit contacts the surface of the cable tray, thereby preventing the cable tray from shifting during drilling, which would lead to low drilling efficiency; under the resistance force between the first resistance pad, the second resistance pad, and the hollow cylinder, when the load on the drill bit exceeds the limit, the resistance force between the first resistance pad, the second resistance pad, and the hollow cylinder can be gradually reduced to zero, at which point the second drill rod can be driven normally by the motor, while the first drill rod stops rotating, thereby protecting the first drill rod, the second drill rod, and the motor.

This invention relates to the field of geotechnical drilling engineering technology, and discloses a method for drilling small-diameter deep wells, comprising the following steps: using a positive circulation drilling rig to prepare a mud system based on the laterite soil of the construction site; using a composite reinforced roller cone bit for drilling operations in pebble layers; using a semi-automatic pulley system to connect or disconnect drill rods; using a positive circulation drilling rig to perform a segmented lifting and scraping wall composite process for drilling, in which a hole guide tool is used for scraping the wall; determining the depth of the aquifer before lowering the well casing; completing the butt joint connection of the well casing by welding, and completing the lowering and installation of the well casing; after the well casing is installed, sequentially performing mud replacement, air compressor agitation and well washing, and simultaneously completing the symmetrical backfilling of filter material; conducting a pumping test to complete the well completion quality acceptance. This invention can significantly improve drilling efficiency, well completion quality, and construction safety in complex pebble formations, while effectively reducing construction costs.

This invention discloses a method for hydraulic mining of ultra-steep and steeply inclined coal seams using boreholes, relating to the field of coal mining technology. The method includes a roadway layout in the mining area, with roadway modules arranged in the pseudo-incline uphill and longwall mining face roadways of the steeply inclined coal seam. The borehole hydraulic mining module includes boreholes and a borehole hydraulic mining system, with a drilling water gun fixed to the top of the drill rod. High-pressure water jets generated by the drilling water gun are used to break up the coal body around the borehole, achieving hydraulic mining. The coal and water transport module includes a coal and water gravity flow channel and a gravity flow trench. A flexible protective net is used to isolate the goaf and protect the coal face and the coal and water gravity flow channel. Therefore, this method requires only the lower roadway drilling rig operator, enabling unmanned operation of the coal face and providing a new technical approach for the safe and efficient mining of steeply inclined coal seams.

The present application provides a kind of inner slag discharging device and its slag discharging method, it includes high wear-resistant obturator, drill bit drill rod device, venturi water and drill slag dry-wet separator, the drill bit drill rod device is located in high wear-resistant obturator, drill slag dry-wet separator is connected with drill bit drill rod device by venturi water.The flow direction of drill slag can be changed by changing the running direction of slag discharging medium, so as to reduce the scouring, soaking and friction of slag discharging medium and drill slag on the hole wall, which is beneficial to the formation of drilling hole;It can achieve the purpose of point coring by achieving "falling and discharging simultaneously";Drilling cuttings can be well collected, which is beneficial to the civilized production of construction site and prevents dirtiness and disorder;If inert gas is used for slag discharging during construction, it can also achieve the purpose of inhibiting spontaneous combustion of coal seam.Through the above technical scheme analysis, the device is theoretically feasible and the operation is reliable, which provides good drilling quality for casing, greatly improves the success rate of drilling and casing and the extraction effect.

This utility model discloses an anti-winding device for pneumatic coal drills, comprising: a base and a stop bar. The base is installed on a housing on one side of the pneumatic coal drill spindle, and the end of the stop bar is fixed to the base, positioning the stop bar on one side of the spindle. The stop bar is spaced apart from the spindle, and the stop bar engages the water hyacinth inlet to prevent it from rotating and winding with the drill rod on the spindle. This device, used in conjunction with a pneumatic coal drill, eliminates the need for the user to hold the water pipe during drilling, preventing it from rotating and winding with the drill rod. It is adaptable to various underground pneumatic coal drills, effectively improving construction safety. The device has a simple structure, is easy to use and manufacture, is safe and reliable, convenient to operate, and cost-effective, achieving the expected results and meeting usage requirements. Its widespread use is recommended.

The utility model relates to the technical field of geotechnical engineering supporting equipment, and disclose a kind of side slope anchor rod positioning support, including support frame, the support frame top is provided with positioning mechanism and moving mechanism;The positioning mechanism includes support assembly and positioning assembly, and support assembly is located at the side of positioning assembly.By setting positioning mechanism, by setting first motor drives first reciprocating screw rod to rotate, to adjust the height of first support box according to the height of side slope and the specific position of anchor rod needing positioning, to effectively carry out the positioning and processing of anchor rod, facilitate operator to operate;By setting moving mechanism, by setting second motor drives second reciprocating screw rod to rotate, so that second reciprocating screw rod drives second support plate to move, to adjust the height of second hydraulic rod and drill rod, to carry out positioning drilling operation to different positions of side slope, to effectively carry out side slope protection work.

The present application relates to the technical field of drill bit, in particular to a rotary drilling rig drill bit with low noise and efficient residue discharge function. It comprises a drill cylinder and a residue discharge mechanism. The top of the drill cylinder is provided with a fixed cylinder and a drill rod. The residue discharge mechanism comprises an inner sandwich layer, which forms an annular air cavity with the drill cylinder. The inner sandwich layer is uniformly provided with a plurality of obliquely downward jet holes in the circumferential direction. A push disc is axially movably arranged in the inner sandwich layer. A plurality of scrapers are evenly distributed along the inner wall of the inner sandwich layer. A telescopic ring is arranged in the annular air cavity, and an air hole is arranged on the telescopic ring corresponding to each jet hole. The main residue is forcedly discharged by the push disc. After resetting, the stress block is aligned with the tangential jet hole, and the compressed air is sprayed out from the obliquely downward jet hole through the annular air cavity to flush the residue. At the same time, the tangential airflow drives the push disc and the elastic scraper to rotate through the jet hole. The scraper is tightly attached to the inner wall to scrape off the adhered soil residue. The residue is discharged without shaking, with low noise and high efficiency.

The utility model discloses a kind of hole-inclination prevention devices for drilling machine, it is related to drilling machine technical field, including fixed vertical plate, the fixed vertical plate is connected with turnover cross frame in the upper end of the side of drill rod close, and turnover rectification pressure arm is hingedly connected with the side of fixed vertical plate away from turnover cross frame, the upper end of turnover rectification pressure arm is hingedly connected with contact groove wheel, and the bottom center of the side of fixed vertical plate towards drill rod is fixedly connected with elastic rectification seat, the center sliding connection of elastic rectification seat has center sliding block, and the center of both sides of center sliding block is fixedly connected with cooperation convex shaft, using the resilience of disc spring group to drill rod is carried out reverse rectification, ensure that drill rod keeps vertical state, improve the accuracy of drilling, through the multiple groups of turnover rectification pressure arm and elastic rectification seat set around drill rod array, cooperate the elastic force of disc spring group, the effective rectification to drill rod is realized, prevent drilling inclination, improve the accuracy and efficiency of drilling.

This utility model relates to a floating centering vertical flipping fixture for wheel hub shafts, comprising a connecting bridge plate, an elastic positioning element, a support structure, and a clamping structure. The upper surface of the connecting bridge plate has several assembly holes. The elastic positioning element is detachably fixed inside the assembly holes for insertion of the wheel hub shaft. The support structure is fixedly connected to the upper surface of the connecting bridge plate near the assembly holes to support the wheel hub shaft. The clamping structure is located on the upper surface of the connecting bridge plate near the outer side of the support structure to clamp the wheel hub shaft. This utility model can simultaneously cover the processes of rough turning the rod section, rough turning the disc section, drilling the center hole, fixing the length, and drilling the center hole of the drill rod section, eliminating the need for multiple clamping fixtures. Multiple processes can be completed in a single clamping, effectively improving work efficiency and avoiding the increased errors caused by repeated clamping in traditional methods.

This utility model relates to the field of oil and gas drilling technology, and in particular to a multifunctional drill pipe transport device for oil drilling. The multifunctional drill pipe transport device includes a frame, a moving mechanism, a supporting mechanism, a first cleaning mechanism, a second cleaning mechanism, and an oiling mechanism. The moving mechanism can drive the frame to move linearly back and forth between the pipe stack and the drill table. The supporting mechanism supports the drill pipe and moves it to the cleaning position. The first and second cleaning mechanisms are respectively located on both sides of the frame along its length to clean the male and female threads of the drill pipe at the cleaning position. The oiling mechanism is located on the first cleaning mechanism for clamping and oiling the male thread of the drill pipe. This device can complete the cleaning of both ends of the drill pipe while transporting it, avoiding the need for additional operations required by separating drill pipe transport and cleaning in the prior art, saving time and ensuring the cleanliness of the drill pipe joints.

The application discloses a black soil layering sampling detection device and belongs to the technical field of soil sampling, which comprises a vertical rack, one side end face of which is fixed with an assembly plate, and the other side end face of the vertical rack is vertically and symmetrically fixed with a slide rail, and the slide rail is vertically and slidably connected with a fixing frame; a soil drilling unit is installed on the fixing frame, and an outer drill pipe is vertically connected below the soil drilling unit; a sample tube is coaxially connected in the outer drill pipe; a soil sampling device is installed below the vertical rack and below the soil drilling unit; in the application, the soil drilling unit can rotate the outer drill pipe into the black soil by using a soil sampling ring knife, and the sample tube is installed in the outer drill pipe and used for soil sampling; after sampling is completed, the sample tube can slide upward relative to the outer drill pipe, and the soil in the sample tube is loosened by using a loosening device, so that different layering soils can be sampled and collected by using the inner channel of the soil sampling device.

The utility model belongs to the technical field of drilling equipment, concretely relates to a high -efficient cleaning equipment of drill rod, including frame, the inner side bottom fixed connection of frame has motor, the pivot fixed connection of motor has drive wheel, the top fixed connection of frame has a pair of mounting seat, a pair of mounting seat between rotationally connected have cleaning axle, the one end fixed connection of cleaning axle towards drive wheel has driven wheel, the drive wheel and driven wheel between the transmission belt of setting up have, the one end fixed connection of cleaning axle away from driven wheel has mounting panel, the side wall rim of mounting panel away from cleaning axle one side surrounds the even setting of a plurality of cleaning mechanisms along cleaning axle. The utility model has the advantages of being provided with motor, cleaning axle and cleaning mechanism, can realize the automatic cleaning to the drill rod, effectively improves the cleaning efficiency to the drill rod, can realize the all -round cleaning to the drill rod simultaneously, effectively improves the cleaning effect to the drill rod.

This utility model relates to a drill pipe device for petroleum geological exploration, comprising a base plate, a mounting frame fixedly installed on the top of the base plate, a hydraulic rod fixedly installed on the bottom of the mounting frame, a motor box fixedly installed on the bottom of the hydraulic rod, a first motor installed inside the motor box, a drill pipe fixedly installed at the output shaft of the first motor, a drill bit connected to the bottom of the drill pipe, and an auxiliary mechanism provided at the bottom of the base plate. When the drill pipe and drill bit move upwards from the soil, they are scraped by three cleaning scraper rings, gradually removing large clumps of soil adhering to the outside of the drill pipe and drill bit. This prevents soil from adhering to the inner wall of the borehole when passing through it. After scraping, a second motor can be controlled to drive two striking rods to swing. The striking rods and cleaning scraper rings are staggered, thus knocking off soil clumps adhering to the bottom of the cleaning scraper rings, reducing the amount of manual cleaning work.

This application provides a parasol cone retrieval device, including a parasol cone sleeved on the outside of a male cone. The male cone has a flange at its end, and an annular groove on its end face. A positioning ring is screwed into the annular groove. A connecting plate is provided at the end of the parasol cone, passing through the flange and screwing into the positioning ring. In this application, the positioning ring fixes the parasol cone and the male cone together. The larger end of the parasol cone guides the fallen drill rod to move towards the axis of the borehole. After the fallen drill rod is straightened, it aligns with the male cone, enabling rapid connection and improving retrieval efficiency.

The application discloses a kind of equipment, system and method for T pile construction, solve the problem that the construction of T pile in prior art needs multiple equipment to be repeatedly withdrawn in turn and then work, with the beneficial effect of improving work efficiency, specific scheme is as follows: a kind of equipment for T pile construction, including bearing platform, rotatable installation is in vehicle frame;Drilling mechanism, installed in bearing platform, drilling mechanism includes power head, power head is detachably connected with auger stem, auger stem is hollow and bottom is provided with drill bit, drill bit can be opened relative to auger stem, internal grouting passage is arranged in the side wall of auger stem, internal grouting passage is arranged through auger stem, the outer diameter of auger stem is large from top to bottom;Steel cage hoisting mechanism, installed in vehicle frame, after power head and auger stem are separated, steel cage hoisting mechanism can be lifted to be placed into auger stem inside after rotating setting angle in bearing platform.

This invention discloses an intensive reverse borehole reaming construction method and equipment, relating to the field of underground engineering construction technology. The core of this method lies in innovating the traditional full-face rock breaking into a two-step process of "peripheral annular cutting + central hydraulic crushing": first, the roller cutter on the reaming drill bit cuts an annular groove in the rock strata, retaining a cylindrical central rock core; then, the hydraulic crushing device integrated into the reaming drill bit directly squeezes or impacts the central rock core, causing it to break and fall off entirely. This invention significantly reduces the rock breaking area and the number of roller cutters, significantly improving drilling efficiency and reducing energy consumption and tool wear. The corresponding equipment includes a drilling rig, drill rod, reaming drill bit, hydraulic power unit system, and an optional clamping and pressing device.

This invention relates to the field of surface defect detection technology, specifically to a vision-based scanning surface defect detection device for oil drill pipes. It includes a drive unit, a displacement assembly, a laser probe, and a control feedback module. This solution uses a clamping assembly to fix the drill pipe's position and provide position status feedback. A laser receiver and laser emitter interact to detect and capture abnormal positional distributions of the drill pipe, avoiding the influence of irrelevant defects or abnormal placement on the surface defect detection. Simultaneously, the displacement assembly and drive unit perform defect detection at different locations on the drill pipe's outer surface, achieving comprehensive defect detection. The control feedback module collects positional parameters of the detection area in real time, constructing a location-based defect re-inspection route for irregularly placed drill pipes, precisely capturing the repair status of each defect repair point, avoiding repeated position corrections, and improving re-inspection efficiency.

This application provides a coal mine gas extraction device, relating to the field of gas extraction technology. It includes a mounting frame, a mounting plate, a drill rod, an extension rod, a lifting assembly, and a rotating assembly. The lifting assembly is mounted on the mounting frame and is used to move the mounting plate up and down. The extension rod is rotatably mounted on the mounting plate via bearings. The rotating assembly is mounted on the mounting plate and is used to rotate the extension rod. The drill rod is slidably sleeved on the extension rod. A first locking assembly is provided between the top of the extension rod and the drill rod, and a second locking assembly is provided between the bottom of the extension rod and the drill rod. The interiors of both the drill rod and the extension rod are hollow, and a through hole is provided at the bottom of the drill rod. By using hollow extension rods and drill rods, and inserting extraction pipes into the extension rods and drill rods, friction between the extraction pipes and the borehole wall is prevented.