CN108505957B - Reaming stirring drilling tool assembly - Google Patents

Abstract

A reaming and stirring drilling assembly comprises a screw drill pipe comprising a male joint body, a female joint socket, a screw blade, a drill pipe oil pipe combination, a drill pipe slurry pipe, an upper end check ring, a lower end check ring and an upper end seal ring, and a reaming drilling tool comprising an outer joint body, a drill pipe combination, a reaming mechanism, an oil distribution ring, a grouting pipe, an upper spiral fin, a lower spiral fin, an inner cutter body, an upper end check ring and an upper end seal ring; the drill rod slurry pipe is fixed in the hollow drill rod inner cavity, the drill rod built-in pipeline is arranged in the grouting pipe inner cavity through the bracket, the upper end of the drill rod built-in pipeline is fixedly arranged in the male connector body and then is fixedly provided with the quick male connector, and the lower end of the drill rod built-in pipeline is fixedly arranged in the male connector socket and then is fixedly provided with the quick female connector; the grouting pipe penetrates through the extension oil cylinder and the oil distribution ring; the upper end of the drill bit oil pipe is fixedly arranged in the outer joint body through a second outer joint seat, then a second quick male joint is fixedly arranged, and the lower end of the drill bit oil pipe is fixedly arranged in an end face counter bore of the oil distribution ring; the invention effectively improves the sealing performance of the hydraulic system, and the hydraulic pipeline is convenient, safe and reliable to assemble, disassemble and maintain, thereby greatly improving the working efficiency.

Description

Reaming stirring drilling tool assembly

Technical Field

The invention relates to a reaming and stirring drilling tool assembly, in particular to a reaming and stirring drilling tool assembly of a reaming drilling machine suitable for pile planting construction.

Background

Along with the construction and development of foundation engineering such as large-scale buildings, high-speed railways, highways, large-scale bridges, urban underground pipe galleries and the like, in order to improve the bearing capacity of pile foundations, a large number of novel pile foundation construction methods of root pile planting combinations are adopted to construct novel bearing piles such as various pedestal piles, calabash piles and the like. The construction method is a large integration of various pile foundation technologies such as drilling, deep stirring, reaming, prefabrication and the like, is suitable for the pile diameter phi 500-1200 mm, has the maximum soil penetration depth of 90m, has the remarkable characteristics of no vibration, low noise, good pile forming quality, high single pile bearing capacity and less mud discharge, and has good social benefit and popularization value. The construction of various pedestal piles and gourd piles is finished, a static pressure reaming pile planting drilling machine is adopted and popularized in large quantity at present, a super drilling tool can penetrate through hard strata such as sand layers and medium-stroke rock strata through being equipped, reaming operation can be carried out at the bottom of a pile hole or the middle part of the pile hole after reaming by using a reaming bit, a hole larger than a pile is formed, the maximum diameter of a single pile section can reach 1.5 m, and the drilling depth can reach more than 100 m. After the reaming operation is finished, mud is injected into the bottom of the pile hole through the inner cavity of the hollow drill rod by the reaming drill, and finally precast piles in various forms are pressed into the pile hole, which shows that the static pressure pile planting technology can improve the bearing capacity of a single pile, reduce the soil compaction effect, has the functions of low carbon, energy conservation and environmental protection, and can be widely applied to future urban construction. For the drilling rod that current hydraulic reaming rig used, in order to satisfy and provide the hydraulic power source to the built-in extension hydro-cylinder of reaming drilling tool, the oil feed and the oil return pipeline that set up on the drilling rod generally have following several forms and the problem that exists: 1) The hydraulic oil pipe arranged in the inner cavity of the drill rod adopts a mode of suspending in the inner hole of the drill rod, and when the drill rod needs to be connected with the drill rod along with the increase of the drilling depth, the connection of the hydraulic oil pipe cannot be ensured to be convenient and fast in place; 2) The hydraulic oil pipe is arranged on the outer side of the drill rod, so that the drill rod structure and the installation are more complicated, the abrasion of the oil pipe is serious, the sealing performance is poor, and the reaming operation efficiency of the drilling machine is greatly reduced. 3) As disclosed in chinese patent CN103206176a, a counter bore step at the end face of the outer hexagon head of the upper end and the bottom of the hexagonal socket of the lower end of each unit drill rod are provided with a fixing ring and a retainer ring, the oil inlet pipe and the oil return pipe are arranged in the inner cavity of the drill rod in parallel, and are fixed by sealing seats arranged on the upper and lower fixing rings, the quick connector is screwed into the sealing seat positioned on the upper fixing ring, and the quick connector is screwed into the sealing seat positioned on the lower fixing ring. Therefore, when the upper drill rod and the lower drill rod are in butt joint, the quick connectors of the oil inlet pipe and the oil return pipe of the lower drill rod are respectively inserted into the quick connector seats of the oil inlet pipe and the oil return pipe of the upper drill rod. The structure is arranged, so that the connection between the oil inlet pipe and the oil return pipe and the fixing ring is quite complex, great difficulty is brought to processing, the manufacturing cost is high, the sealing performance of the oil inlet pipe and the oil return pipe can not be effectively guaranteed in the use process of the installed product, when the structure is used, cement slurry in the inner cavity of the drill rod can sometimes enter the oil pipe, the hole enlarging drill bit at the front end of the drill rod is caused to be failed, the timely opening and closing of the expansion cutting fins can be influenced at any time, and the construction efficiency is greatly reduced.

Disclosure of Invention

The invention aims to overcome the defects of the conventional reaming drilling machine, and provides a reaming and stirring drilling tool assembly capable of effectively ensuring accurate connection of a built-in hydraulic pipeline and a grouting pipeline of a drilling machine, effectively improving the sealing performance of the connection of a hydraulic oil pipe of a reaming mechanism, facilitating accurate butt joint of a quick connector, and having the advantages of convenient assembly, disassembly and maintenance of the hydraulic pipeline, greatly improving the drilling, reaming and stirring operation efficiency of a pile planting drilling machine and effectively reducing engineering construction cost.

The invention is realized by the following technical scheme:

a reamer mixing drill assembly comprising: auger stem, reamer bit with helical blade and extension arm, wherein:

the spiral drill rod comprises a hollow drill rod body with a male connector body and a female connector socket, a spiral blade arranged on the outer wall of the hollow drill rod body, a drill rod oil pipe combination arranged in the hollow drill rod body, and a drill rod slurry pipe with a bracket, an upper end check ring, an upper end seal ring, a lower end check ring and a lower end seal ring, wherein:

the male joint body comprises a first step-shaped step positioned in the through hole of the upper end surface of the male joint body, a male joint journal positioned on the outer wall of the upper part of the male joint body and a first transverse semicircular groove positioned on the outer wall of the middle part of the male joint body; the female joint socket comprises a second step, a third step, a second transverse semicircular groove and a locking screw hole, wherein the second step and the third step are positioned in the socket at the lower part of the female joint socket;

The drill pipe oil pipe combination includes that two sets of parallel arrangement have outer joint assembly, nipple assembly and be in outer joint assembly and nipple assembly between the built-in pipeline of drill pipe that has first hard tube, outer joint seat, nipple seat and a plurality of bracket, wherein:

the outer joint seat comprises a base with two symmetrical first jacks and first grouting holes, a flange which is connected above the base and provided with opposite first notches, an outer seat flange groove positioned on the outer circle of the flange, and an outer seat flange pin hole and an outer seat flange screw hole on the end face of the flange;

the outer joint assembly comprises a first outer joint, a quick male joint, an elastic retainer ring and a first O-shaped ring; wherein, the upper part of the outer wall of the first outer joint is provided with a convex ring, when the first outer joint is installed in the outer joint seat, the first outer joint is placed on the bottom end of the base socket of the outer joint seat through the convex ring, and the outer wall of the first outer joint is divided into an upper first journal and a lower second journal by taking the convex ring as a boundary; the first outer joint further comprises an outer upper end counter bore used as an inner hole in the corresponding position of the first journal, an outer lower end counter bore used as an inner hole in the corresponding position of the second journal, and an outer groove and an outer annular groove which are arranged on the outer wall opposite to the base of the outer joint seat;

The inner joint seat comprises a base with two symmetrical second jacks and second grouting holes, a flange which is connected below the base and provided with a second opposite notch, an inner seat flange groove positioned on the outer circle of the flange, an inner seat flange pin hole and an inner seat flange screw hole on the end face of the flange;

the inner joint assembly comprises a first inner joint, a guide sleeve, a guide rod, a second inner joint, a butterfly spring, a quick female joint, an elastic retainer ring, a first O-shaped ring, a framework seal, a second O-shaped ring and a third O-shaped ring; wherein,,

the second inner joint is provided with a convex ring at the upper part of the outer wall, when the second inner joint is installed in the inner joint seat, the second inner joint is placed on the top end of a base socket of the inner joint seat through the convex ring, and the outer wall of the second inner joint is divided into an upper fourth shaft neck and a lower inner and outer thread by taking the convex ring as a boundary; the second inner joint also comprises an inner two upper end counter bore which is used as an inner hole at the corresponding position of the fourth journal, and an inner two groove and an inner two ring groove which are arranged on the outer wall opposite to the base of the inner joint seat;

the guide sleeve is sequentially provided with a sleeve internal thread, a sleeve middle through hole and a sleeve lower end counter bore from bottom to top, and also comprises a sleeve internal groove and a sleeve internal ring groove which are positioned on the inner wall of the sleeve lower end counter bore;

The guide rod is a stepped rod with a head and comprises a rod journal, rod threads and a rod through hole;

an inner upper end counter bore, an inner thread, an inner middle step bore, an inner lower end counter bore and an inner annular groove positioned on the inner wall of the inner upper end counter bore are arranged in the inner hole of the first inner joint;

the brackets are arranged in the drill rod slurry pipe and are provided with two symmetrical pipeline through holes, two symmetrical third slurry injection holes and bracket ring grooves;

the reaming bit includes the cavity bit body, have the through-hole and be located the outer joint body of cavity bit body top, be located the drill bit oil pipe combination of cavity bit body hole, have the slip casting hole and be located the bottom flange of cavity bit body below, have the reaming mechanism of extension arm and extension hydro-cylinder, be located the oil ring that joins in marriage of extension hydro-cylinder top, run through the slip casting pipe of extension hydro-cylinder and oil ring, arrange in cavity bit body outer wall and be located the upper spiral fin of extension arm top, be located the extension arm below and have the lower spiral fin of cutting cutter body, be located the inner cutter body of bottom flange terminal surface, upper end retaining ring and upper end sealing washer, wherein:

the outer joint body comprises a fourth step-shaped step positioned in the through hole of the upper end surface of the outer joint body, an outer joint journal positioned on the outer wall of the upper part of the outer joint body, a third transverse semicircular groove positioned on the outer wall of the middle part of the outer joint body and a fifth step-shaped step positioned at the bottom of the outer joint body;

The drill bit oil pipe assembly comprises a second outer joint seat, an oil distribution ring, two groups of drill bit built-in pipelines which are arranged in parallel and provided with a second outer joint assembly comprising a second outer joint, a second quick male joint, an elastic retainer ring and a first O-shaped ring, and a second hard pipe which is arranged between the second outer joint and the oil distribution ring and provided with a hard pipe upper joint body and a hard pipe lower joint body; wherein,,

the second outer joint is provided with a convex ring at the upper part of the outer wall, when the second outer joint is installed in the second outer joint seat, the second outer joint is placed on the bottom end of the base socket of the second outer joint seat through the convex ring, and the outer wall of the second outer joint is divided into an upper outer two upper shaft necks and a lower outer two lower shaft necks by taking the convex ring as a boundary; the second outer joint further comprises an outer two upper end counter bore used as an inner hole at the corresponding position of the outer two upper journals, an outer two lower end counter bore used as an inner hole at the corresponding position of the outer two lower journals, and an outer two groove and an outer two ring groove which are arranged on the outer wall opposite to the base of the second outer joint;

the second outer joint seat comprises a base with two symmetrical third jacks and fourth grouting holes, a flange which is connected above the base and provided with a third gap opposite to the third jack, a second outer seat flange groove positioned on the outer circle of the flange, and a second outer seat flange pin hole and a second outer seat flange screw hole on the end face of the flange;

The oil distribution ring comprises two axially parallel end face counter bores, two axially parallel straight oil channels arranged in the oil distribution ring, a transverse inner oil channel connecting the end face counter bores and the straight oil channels, an oil ring middle hole arranged in the oil distribution ring and positioned below the end face counter bores, an oil ring bottom hole and two oil ring inclined holes;

the method is characterized in that:

the drill rod slurry pipe of the spiral drill rod is fixed in the inner cavity of the hollow drill rod body by welding by utilizing a plurality of brackets, and two ends of the drill rod slurry pipe are respectively communicated with the inner holes of the male joint body and the female joint socket;

the drill pipe oil pipe assembly is arranged in an inner hole of the drill pipe slurry pipe, two first hard pipes penetrate through two symmetrical pipeline through holes in the plurality of brackets, the brackets are fixed on the outer wall of the first hard pipe, and bracket ring grooves of the plurality of brackets are arranged in the inner hole of the drill pipe slurry pipe after the O-shaped sealing rings are arranged; the upper end of the drill pipe oil pipe assembly is fixed at the bottom of the first step-shaped step of the male joint body in a mode of installing an upper end retainer ring on the outer side surface of the outer joint seat, an upper end sealing ring is installed in an outer seat flange groove, and an outer seat flange pin hole and an outer seat flange screw hole on the flange end surface of the drill pipe oil pipe assembly are respectively positioned by adopting a positioning pin and fastened by adopting a screw; the lower end of the inner joint seat is fixed at the bottom of a second step of the female joint socket in a mode of installing a lower end retainer ring on the outer side surface of the inner joint seat, a lower end sealing ring is installed in an inner seat flange groove, and an inner seat flange pin hole and an inner seat flange screw hole on the flange end surface of the inner seat flange groove are respectively positioned by a positioning pin and fastened by a screw;

The two groups of built-in pipelines of the drill pipes are respectively formed by connecting a first hard pipe, an outer joint assembly and an inner joint assembly, and two ends of the first hard pipe are respectively fixedly arranged in an outer lower end counter bore of the first outer joint and inner two upper end counter bores of the second inner joint;

the outer joint assemblies of the two groups of built-in pipelines of the drill rod are respectively inserted into two symmetrical first sockets in the outer joint seat through second journals of the first outer joint and are fixed in a mode that elastic check rings are arranged in an outer groove, and a first O-shaped ring is arranged in the outer annular groove; a quick male connector is arranged in a counter bore at the upper end of the first outer connector;

the inner joint assemblies of the two groups of built-in pipelines of the drill rod are respectively inserted into two symmetrical second sockets in the inner joint seat through fourth shaft necks of the second inner joint and are fixed in a mode of installing elastic check rings in the inner two grooves, and a first O-shaped ring is installed in the inner two ring grooves;

the guide rod passes through a rod thread at the lower end of the guide sleeve to be screwed with an internal thread in the inner hole of the first inner joint through a sleeve lower end counter bore of the guide sleeve, the rod shaft neck of the guide rod is arranged in a sleeve lower end counter bore of the guide sleeve, and a sleeve inner groove and a sleeve inner ring groove of the sleeve lower end counter bore are respectively provided with a skeleton seal and a third O-shaped ring;

The belleville springs are formed by overlapping one group of 2 plates and a plurality of groups of plates, and are arranged in the middle through hole of the sleeve of the guide sleeve and positioned between the upper end face of the guide rod and the lower end face of the second inner joint;

the guide sleeve is screwed on the internal and external threads at the lower end of the second inner joint through the sleeve internal threads at the upper end of the guide sleeve;

a second O-shaped ring is arranged in an annular groove of a counter bore at the inner upper end of the first inner joint; a quick female connector is arranged in a middle step hole in the first inner connector;

when the outer joint body of the reaming bit is inserted into the female joint socket at the lower end of the spiral drill rod, the outer joint journal of the outer joint body is arranged on a third step-shaped step of the female joint socket of the spiral drill rod in a matched manner, a locking pin hole which is oppositely matched with a second transverse semicircular groove which is positioned on the inner wall of the female joint socket of the spiral drill rod is formed by the third transverse semicircular groove positioned on the outer wall of the outer joint body, the outer joint body is locked after a joint bolt is inserted, and finally the outer joint body of the reaming bit is completely locked in the female joint socket of the spiral drill rod after a locking bolt is screwed into the locking pin hole, so that the upper spiral drill rod is firmly connected with the reaming bit below;

the two drill bit built-in pipelines of the drill bit oil pipe combination are respectively formed by connecting a second hard pipe and an outer joint assembly, the upper end of the drill bit built-in pipeline is fixed at the bottom of a fourth step of an outer joint body in a mode of installing a second upper end check ring on the outer side surface of a second outer joint seat of the drill bit built-in pipeline, a second upper end sealing ring is installed in a second outer seat flange groove of the drill bit built-in pipeline, and a second outer seat flange pin hole and a second outer seat flange screw hole on the flange end surface of the drill bit built-in pipeline are respectively positioned by adopting a positioning pin and fastened by adopting a screw;

The upper ends of the two second hard pipes are fixedly arranged in outer lower end counter bores of the second outer joint through hard pipe upper joint bodies respectively, the lower ends of the two second hard pipes are connected with two end face counter bores of the oil distributing ring through hard pipe lower joint bodies, the two end face counter bores are communicated with two straight oil passages through two transverse inner oil passages respectively, and the oil distributing ring is fixedly arranged together with an expansion oil cylinder of the reaming mechanism through screws and is arranged in a hole of the hollow drill bit body; the two straight oil channels are communicated with two straight oil channels arranged in a piston rod at the upper end of the expansion cylinder;

the second outer joint assemblies of the two groups of drill bit built-in pipelines are respectively inserted into two symmetrical third sockets in the second outer joint seat through outer lower journals of the second outer joint and are fixed in a mode of installing elastic check rings in outer two grooves, and a first O-shaped ring is installed in the outer two grooves; a second quick male connector is arranged in the counter bore at the outer two upper ends of the second outer connector;

the grouting pipe penetrates through the inner cavity of the expansion oil cylinder, the upper end of the grouting pipe is arranged in an oil ring bottom hole of the oil distribution ring, and the oil ring bottom hole is connected with an oil ring middle hole and two oil ring inclined holes; the lower end of the flange is fixedly arranged in a central counter bore of the bottom flange;

The lower edges of blades of the helical blades on the outer wall of the hollow drill rod body of the helical drill rod are mutually attached to the upper edges of the fins of the upper helical fins on the outer wall of the hollow drill bit body of the reaming bit, so that the helical blades and the upper helical fins are combined smoothly;

when the male joint body of one spiral drill rod is inserted into the female joint socket of the other spiral drill rod, the male joint shaft neck of the male joint body is arranged on the third step of the female joint socket in a matched mode, a first transverse semicircular groove positioned on the outer wall of the male joint body and a second transverse semicircular groove positioned on the inner wall of the female joint socket form a relatively-matched locking pin hole, the male joint body is locked after the joint pin is inserted, and finally the male joint body is completely locked in the female joint socket after the locking bolt is screwed in the locking pin hole, so that the upper spiral drill rod and the lower spiral drill rod are firmly connected.

The invention can be that the parallelism tolerance requirement of the axial center line of the two drill rod built-in pipelines relative to the outer circles of the flanges of the outer joint seat and the inner joint seat is 0.08-0.10mm; the parallelism tolerance requirement of the axial center line of the two drill bit built-in pipelines relative to the second outer joint seat and the flange excircle of the oil distributing ring is 0.08-0.10mm.

The invention can also be that after the belleville spring in the inner joint assembly is assembled to the sleeve middle through hole of the guide sleeve, the initial pressing force is more than or equal to 2.0kN, and the pressing force is more than or equal to 4.0kN after the belleville spring is compressed for 2.10 mm.

Drawings

FIG. 1 is a schematic view of the reamer tool assembly of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a cross-sectional view taken in the direction M-M of FIG. 1;

FIG. 4 is an N-N cross-sectional view of FIG. 2;

FIG. 5 is a bottom view of FIG. 1;

FIG. 6 is a cross-sectional view taken in the direction K-K of FIG. 4;

FIG. 7 is an enlarged view of portion C of FIG. 3;

FIG. 8 is an enlarged view of portion B of FIG. 4;

fig. 9 is an enlarged view of a portion a in fig. 4;

FIG. 10 is a schematic view of the drill pipe and tubing assembly of the auger stem of the present invention;

FIG. 11 is a cross-sectional view taken along line A-A of FIG. 10;

FIG. 12 is a top view of FIG. 10;

FIG. 13 is a bottom view of FIG. 10;

FIG. 14 is a sectional view taken along E-E of FIG. 8;

FIG. 15 is a schematic view of a partial construction of a bit oil line assembly of a reamer bit of the present invention;

FIG. 16 is a cross-sectional view taken along B-B in FIG. 15;

fig. 17 is a top view of fig. 15.

Detailed Description

The drill pipe with built-in hydraulic oil pipe according to the invention will be further described with reference to the accompanying drawings.

A reamer mixing drill assembly comprising: auger stem 1, reamer bit 9 with helical blades and extension arms, wherein:

the auger stem 1 comprises a hollow stem body 10 having a male connector body 11 and a female connector socket 12 with through holes, an auger blade 16 arranged on the outer wall of the hollow stem body, a drill stem oil pipe combination 2 arranged in the hollow stem body, and a drill stem slurry pipe 3 having a bracket 32, an upper end retainer 248, an upper end seal ring 249, a lower end retainer 258 and a lower end seal ring 259, wherein: the male joint body 11 includes a first stepped step 112 in the through hole of the upper end surface thereof, a male joint journal 113 in the upper outer wall thereof, and a first transverse semicircular groove 114 in the middle outer wall thereof; the female connector socket 12 includes a second stepped step 122 in its lower socket or receptacle, a third stepped step 123, a second transverse semicircular slot 124 in its inner wall, and a locking screw hole 125 extending therethrough.

The drill pipe and tubing assembly 2 includes two sets of parallel drill pipe built-in lines 27, 27' having a first hard pipe 26 disposed between the outer joint assembly and the inner joint assembly, an outer joint seat 240, an inner joint seat 250, and a plurality of brackets 22, wherein:

the outer joint part 240 comprises a base having two symmetrical first sockets 2401, 2401' and first grouting holes 2403, 2403' and a flange connected above the base and having opposed first notches 2402, 2402' thereon, which typically also extend partially downwardly into and on opposite sides of the peripheral outer wall of the base; the flange also has an outer seat flange groove 2406 on the outer circumference of the flange, and outer seat flange pin holes 2404 and outer seat flange screw holes 2405 on the end face of the flange.

The outer joint assembly includes a first outer joint 245, a quick-male joint 246, a circlip 44, and a first O-ring 55; among them, the first outer joint 245 has a convex ring on the upper part of its outer wall, when installed in the outer joint seat 240, it rests on the bottom end of the base socket of the outer joint seat through the convex ring, and its outer wall is divided into an upper first journal 2453 and a lower second journal 2452 by the convex ring as a boundary; the first outer joint 245 further comprises an outer upper end counter bore 2451 in the inner bore corresponding to the first journal 2453, an outer lower end counter bore 2454 in the inner bore corresponding to the second journal 2452, and an outer groove 24522 and an outer ring groove 24521 provided on the outer wall opposite to the base of the outer joint seat 240; the inner joint part 250 comprises a base having two symmetrical second sockets 2501, 2501' and second grouting holes 2503, 2503' and a flange connected above the base and having opposite second notches 2502, 2502' in the lower part thereof, the first notches also extending generally partially downwardly into and on opposite sides of the peripheral outer wall of the base; the flange also has an inner seat flange recess 2506 on the outer circumference of the flange and inner seat flange pin holes 2504 and inner seat flange screw holes 2505 on the flange end faces.

The nipple assembly includes a first nipple 251, a guide sleeve 253, a guide rod 252, a second nipple 255, a belleville spring 254, a quick box 256, a circlip 44, a first O-ring 55, a backbone seal 66, a second O-ring 77, and a third O-ring 88; wherein, the second inner joint 255 is provided with a convex ring at the upper part of the outer wall thereof, when being installed in the inner joint seat 250, the second inner joint 255 is placed on the top end of the base socket of the inner joint seat through the convex ring, and the outer wall thereof is divided into an upper fourth journal 2552 and a lower inner and outer thread 2553 by taking the convex ring as a boundary; the second inner joint 255 further comprises an inner two upper end counter bore 2555 serving as an inner hole in a corresponding position of the fourth journal 2552, and an inner two groove 25522 and an inner two ring groove 25521 which are arranged on the outer wall opposite to the base of the inner joint seat 250; the guide sleeve 253 is provided with a sleeve internal thread 2533, a sleeve middle through hole 2532 and a sleeve lower end counter bore 2531 in sequence from bottom to top, and the guide sleeve 253 also comprises a sleeve internal groove 25311 and a sleeve internal ring groove 25312 which are positioned on the inner wall of the sleeve lower end counter bore 2531; the guide rod 252 is a stepped rod with a head, having a rod neck 2522, rod threads 2521, and a rod through bore 2523; inner bore of first inner joint 251 is provided with an inner upper counterbore 2514, an inner thread 2513, an inner middle step bore 2512 and an inner lower counterbore 2511, as well as an inner annular groove 25141 located on the inner wall of inner upper counterbore 2514.

A plurality of brackets 22 are mounted in the drill pipe 3 with two symmetrical pipe through holes 221, 221', two symmetrical third grouting holes 223, 223' and a bracket ring groove 220.

The reamer bit 9 comprises a hollow bit body 90, an outer joint body 91 with a through hole and positioned above the hollow bit body, a bit oil pipe combination 92 positioned in the hollow bit body hole, a bottom flange 93 with a grouting hole 931 and positioned below the hollow bit body, a reaming mechanism 94 with an expansion arm 941 and an expansion cylinder 942 and positioned inside and outside the hollow bit body 90 respectively, an oil distribution ring 922 positioned above the expansion cylinder, a grouting pipe 97 penetrating the expansion cylinder and the oil distribution ring, an upper spiral wing 96 arranged on the outer wall of the hollow bit body 90 and positioned above the expansion arm 941, a lower spiral wing 98 positioned below the expansion arm 941 and provided with a cutting blade, an inner blade 99 positioned on the end face of the bottom flange, an upper end retainer 248 and an upper end sealing ring 249; wherein:

the outer joint body 91 includes a fourth stepped step 912 in the through hole of the upper end surface thereof, an outer joint journal 913 in the upper outer wall thereof, a third transverse semicircular groove 914 in the middle outer wall thereof, and a fifth stepped step 916 in the bottom thereof.

The bit oil pipe assembly 92 includes a second outer joint seat 9240, an oil distribution ring 922, two sets of parallel bit built-in pipelines 927, 927' with a second outer joint assembly including a second outer joint 9245, a second quick-connect male joint 9246, a circlip 44 and a first O-ring 55, a second hard pipe 926 between the second outer joint 9245 and the oil distribution ring, with a hard pipe upper joint body 9261 and a hard pipe lower joint body 9262; wherein,,

The second outer joint 9245 is provided with a convex ring at the upper part of the outer wall thereof, when being installed in the second outer joint seat 9240, the second outer joint 9245 is placed on the bottom end of the base socket of the second outer joint seat through the convex ring, and the outer wall thereof is divided into an upper outer two upper journals 92453 and a lower outer two lower journals 92452 by taking the convex ring as a boundary; the second outer joint 9245 further comprises an outer two upper end counter bore 92451 as the position of an outer two upper journal 92453, an outer two lower end counter bore 92454 as the position of a fourth journal 2452, and an outer two groove 924522 and an outer two ring groove 924521 provided on the outer wall opposite to the base of the second outer joint 9245; the second outer joint part 9240 comprises a base having two symmetrical third sockets 92401, 92401' and fourth grouting holes 92403, 92403' and a flange connected above the base and having opposed third notches 92402, 92402' thereon, which typically also extend partially downwardly into and on opposite sides of the peripheral outer wall of the base; the flange also has a second seat flange recess 92406 on the outer circumference of the flange and second seat flange pin holes 92404 and second seat flange screw holes 92405 on the flange end face.

The oil distribution ring 922 has two axially parallel end face counter bores 9221, 9221', two axially parallel straight oil passages 9222, 9222' disposed inside the oil distribution ring, transverse inner oil passages 9223, 9223 'connecting the end face counter bores and the straight oil passages, an oil ring intermediate bore 9224 disposed within the oil distribution ring below the end face counter bores, an oil ring bottom bore 9226, and two oil ring inclined bores 9225,9225'.

The drill pipe slurry pipe 3 of the spiral drill pipe 1 is placed in the inner cavity of the hollow drill pipe body 10 by utilizing a plurality of brackets 32 and being fixed by welding, and two ends of the drill pipe slurry pipe are respectively communicated with the inner holes of the male joint body 11 and the female joint socket 12.

The drill pipe oil pipe assembly 2 is placed in the inner hole of the drill pipe slurry pipe 3, two first hard pipes 26 pass through two symmetrical pipeline through holes 221, 221' in the plurality of brackets 22, the brackets are fixed on the outer wall of the first hard pipes 26, and bracket ring grooves 220 of the plurality of brackets 22 are placed in the inner hole of the drill pipe slurry pipe 3 after the O-shaped sealing rings are installed; the upper end of the drill pipe oil pipe assembly 2 is fixed at the bottom of the first step-shaped step 112 of the male connector 11 by installing an upper end retainer 248 on the outer side surface of the outer connector seat 240, an upper end sealing ring 249 is installed in an outer seat flange groove 2406, and an outer seat flange pin hole 2404 and an outer seat flange screw hole 2405 on the flange end surfaces of the upper end sealing ring 249 are respectively positioned and fastened by adopting positioning pins and screws; the lower end of the inner seat flange groove 2506 is fixed at the bottom of the second step 122 of the female connector socket 12 by installing a lower end retainer ring 258 on the outer side surface of the inner connector seat 250, the lower end sealing ring 259 is installed on the inner seat flange groove 2506, and the inner seat flange pin hole 2504 and the inner seat flange screw hole 2505 on the flange end surface are respectively positioned and fastened by positioning pins and screws.

The two sets of built-in drill pipes 27, 27' are respectively formed by connecting a first hard pipe 26, an outer joint assembly and an inner joint assembly, specifically, two ends of the first hard pipe 26 are respectively fixedly installed in an outer lower end counter bore 2454 of a first outer joint 245 and inner two upper end counter bores 2555 of a second inner joint 255; in addition, the outer joint assemblies of the two sets of built-in drill pipes 27, 27 'are respectively inserted into the two symmetrical first sockets 2401, 2401' of the outer joint seat 240 through the second shaft neck 2452 of the first outer joint 245, and are fixed in a manner that the circlips 44 are installed in the outer groove 24522, and the first O-rings 55 are installed in the outer ring groove 24521; a quick male connector 246 is arranged in an outer upper end counter bore 2451 of the first outer connector 245; the inner joint assemblies of the two sets of built-in drill pipes 27 and 27 'are respectively inserted into the two symmetrical second sockets 2501 and 2501' in the inner joint seat 250 through the fourth shaft neck 2552 of the second inner joint 255 and are fixed in a manner that the circlips 44 are arranged in the inner two grooves 25522, and the first O-rings 55 are arranged in the inner two ring grooves 25521; the guide rod 252 is screwed with the internal thread 2513 in the inner hole of the first inner joint 251 through the rod thread 2521 at the lower end of the guide rod through the sleeve lower end counter bore 2531 of the guide sleeve 253, the rod shaft neck 2522 of the guide rod 252 is placed in the sleeve lower end counter bore 2531 of the guide sleeve 253, and the sleeve inner groove 25311 and the sleeve inner ring groove 25312 of the sleeve lower end counter bore 2531 are respectively provided with a framework seal 66 and a third O-shaped ring 88; the belleville springs 254 are formed by overlapping one group of 2 pieces and overlapping a plurality of groups of belleville springs, are arranged in the sleeve middle through holes 2532 of the guide sleeve 253 and are positioned between the upper end face of the guide rod 252 and the lower end face of the second inner joint 255; the guide sleeve 253 is screwed on the internal and external threads 2553 at the lower end of the second inner joint 255 through the sleeve internal threads 2533 at the upper end of the guide sleeve; an inner annular groove 25141 of an inner upper end counterbore 2514 of first nipple 251 mounts second O-ring 77; a quick-connect coupling 256 is disposed in an inner intermediate stepped bore 2512 of the first nipple 251.

When the outer connector 91 of the reamer bit 9 is inserted into the female connector socket 12 at the lower end of the spiral drill rod 1, the outer connector journal 913 thereof is matched with the third step 123 of the female connector socket 12 of the spiral drill rod 1, the third transverse semicircular groove 914 on the outer wall of the outer connector 91 forms a relative matched locking pin hole with the second transverse semicircular groove 124 on the inner wall of the female connector socket 12 of the spiral drill rod 1, the outer connector 91 of the reamer bit 9 is locked after the connector pin is inserted, and finally the outer connector 91 of the reamer bit 9 is completely locked in the female connector socket 12 of the spiral drill rod 1 after the locking bolt is screwed into the locking screw hole 125, so that the spiral drill rod 1 above and the reamer bit 9 below are firmly connected.

The two built-in drill pipes 927, 927' of the drill oil pipe assembly 92 are respectively formed by connecting a second hard pipe 926 and a second outer joint assembly, the upper end of the two built-in drill pipes is fixed at the bottom of a fourth step 912 of the outer joint body 91 in a mode of installing a second upper end retainer ring 9248 on the outer side surface of a second outer joint seat 9240, a second upper end sealing ring 9249 is installed in a second outer seat flange groove 92406, and a second outer seat flange pin hole 92404 and a second outer seat flange screw hole 92405 on the flange end surface of the two built-in drill pipes are respectively positioned by positioning pins and screw fastening.

The upper ends of the two second hard pipes 926 are respectively fixed in the outer two lower end counterbores 92454 of the second outer joint 9245 through a hard pipe upper joint body 9261, the lower ends of the two second hard pipes are connected with the two end face counterbores 9221, 9221 'of the oil distributing ring 922 through a hard pipe lower joint body 9262, the two end face counterbores 9221, 9221' are respectively communicated with the two straight oil passages 9222, 9222 'through two transverse inner oil passages 9223, 9223', and the oil distributing ring 922 is fixedly arranged together with the expansion oil cylinder 942 of the reaming mechanism 94 through screws and is arranged in the hole of the hollow drill bit body 90; the two straight oil passages 9222, 9222' are communicated with two straight oil passages arranged in a piston rod at the upper end of the expansion cylinder 942.

The second outer joint assemblies of the two sets of the drill bit built-in pipelines 927, 927 'are respectively inserted into the second symmetrical third sockets 92401, 92401' in the second outer joint base 9240 through the outer lower journals 92452 of the second outer joint 9245, and are fixed in a manner that the elastic retainer rings 44 are arranged in the outer two grooves 924522, and the first O-shaped rings 55 are arranged in the outer two ring grooves 924521; a second quick-connect male connector 9246 is disposed in the outer two upper counterbore 92451 of the second outer connector 9245.

After penetrating through the inner cavity of the expansion cylinder 942, the grouting pipe 97 is arranged at the upper end of the grouting pipe and is arranged in an oil ring bottom hole 9226 of the oil distribution ring 922, and the oil ring bottom hole is connected and communicated with an oil ring middle hole 9224 and two oil ring inclined holes 9225,9225'; the lower end of which is fixed in a central counter bore of the bottom flange 93.

The lower blade edge 161 of the helical blade 16 on the outer wall of the hollow shank body 10 of the auger stem 1 is in abutment with the upper blade edge 961 of the upper helical blade 96 on the outer wall of the hollow bit body 90 of the reamer bit 9 so that the helical blade 16 and the upper helical blade 96 are smoothly and complementarily integrated. Therefore, when the drilling machine drills, stirs and discharges soil, the smooth and convenient discharge of soil and residue in the hole forming is effectively ensured, and the operation efficiency of the drilling machine is improved.

When the male joint body 11 of one screw rod 1 is inserted into the female joint socket 12 of another screw rod 1, the male joint journal 113 of the male joint body is matched with the third step 123 of the female joint socket 12, the first transverse semicircular groove 114 positioned on the outer wall of the male joint body 11 and the second transverse semicircular groove 124 positioned on the inner wall of the female joint socket 12 form a relatively matched locking pin hole, the male joint body 11 is locked after the joint pin is inserted, and finally the male joint body 11 is completely locked in the female joint socket 12 after the locking bolt is screwed in the locking screw hole 125, so that the upper screw rod and the lower screw rod are firmly connected.

The parallelism tolerance requirement of the axial center lines of the two drill rod built-in pipelines 27, 27' relative to the flange excircles of the outer joint seat 240 and the inner joint seat 250 is 0.08-0.10mm; the axial center lines of the two built-in drill pipes 927, 927' have a parallelism tolerance of 0.08-0.10mm with respect to the flange outer circles of the second outer joint base 9240 and the oil distribution ring 922. After the belleville springs 254 in the inner joint assembly are assembled to the sleeve middle through holes 2532 of the guide sleeve 253, the initial pressing force is more than or equal to 2.0kN, and after the belleville springs are compressed for 2.10mm, the pressing force is more than or equal to 4.0kN. Like this, when effectively having guaranteed the butt joint of the auger stem 1 of top and the reamer bit 9 of below, the second quick-operation male connector 9246 of two built-in pipelines of drill bit 927, 927 'in reamer bit 9 inserts the quick-operation female connector 256 of two built-in pipelines of drill bit 27, 27' in auger stem 1 in place and fully reliable's butt joint, and can reach in time breaking away from when the separation of second quick-operation male connector 9246 from quick-operation female connector 256 to the drilling rod dismantles, and effectively improves hydraulic line's sealing performance.

When the upper spiral drill rod 1 is in butt joint with the lower reaming bit 9, after the second quick male connector 9246 in the drill pipe assembly 92 in the hole of the hollow drill bit body 90 of the reaming bit 9 is inserted into the quick female connector 256 in the drill pipe assembly 2 in the hole of the hollow drill rod body 10 of the spiral drill rod 1, the second outer connector 9245 pushes the first inner connector 251 and the guide rod 252 in threaded connection with the first inner connector upward to apply and maintain an acting force on the belleville spring 254, and the acting force is used as a compensation stroke, so that the effective communication between the drill pipe assembly 92 and the two groups of built-in oil pipes of the drill pipe assembly 2 is facilitated, and the two groups of oil pipes of the oil distribution ring 922 are communicated with the built-in oil pipes of the expansion oil cylinder 942, so that the expansion arm 941 is ensured to perform contraction and expansion operation; and inner lower end counterbore 2511 of first inner joint 251 is used as a pilot hole and mates with third collar 92453 of second outer joint 9245 when second quick male joint 9246 is inserted into quick female joint 245.

In the grouting pipe 3 arranged in the inner cavity of the spiral drill rod 1, a communicated cement slurry conveying pipeline is formed through two symmetrical third grouting holes 223, 223' on a plurality of brackets 22 fixed on two groups of built-in oil pipes 27, 27', and the grouting pipe 3 in the spiral drill rod 1 is communicated with the grouting pipe 93 in the reaming bit 9 through two symmetrical third grouting holes 92403, 92403' arranged on the base of the second outer joint seat 9240 in the counter bore of the outer joint body 91 of the reaming bit 9 and the third notches 92402, 92402' arranged on the outer wall and the opposite flange above the base, and two symmetrical second jacks 2501, 2501' and second grouting holes 2503, 2503' arranged on the base of the inner joint seat 250 and the second notches 2502, 2502' connected on the outer wall and opposite flange above the base.

After the pile planting drilling machine, namely the reaming and stirring drilling assembly of the invention, completes the connection of all drill rods, the spiral drill rods and the reaming drill bit and the connection of the built-in oil pipe, the inner cutter head 99 arranged on the flange surface of the front end part of the hollow drill bit body 90 of the reaming drill bit 9 and the cutting cutter body positioned below the lower spiral wing piece 98 of the outer wall of the hollow drill bit body 90 are utilized to simultaneously drill, cut and stir the stratum, and the lower spiral wing piece 98, the upper spiral wing piece 96 positioned above the lower spiral wing piece 98 and the spiral blade 16 positioned on the outer wall of the hollow drill bit body 10 are utilized to discharge the redundant soil and the hole slag in the hole out of the pre-drilled hole; according to the technical requirements of pile planting, a reaming bit 9 performs reaming operation at the positions of the bottom of a pre-drilled hole or different depths of the pre-drilled hole, after the reaming diameter reaching the design requirements is achieved, an expanding arm 942 is folded, after the soil at the positions of the bottom of the hole and the different positions of a hole body is fully stirred, a grouting system from outside is used for preparing cement slurry solidifying liquid for the soil at the pile end and the soil at the pile body in a certain proportion through a spiral drill rod 1, a pipeline built-in by the reaming bit 9 and a grouting hole 931, after all drill rods and bits of a drilling machine are pulled out, a precast pile is pressed into the pre-drilled hole, and after the cement slurry and the precast pile are solidified and fully combined, a cement soil column pile body with the diameter larger than that of the precast pile is formed. The binding force between the pile and the cement soil is greatly increased, the pile end bearing capacity is improved by lengthening the length of the solidified root part of the pile end and enlarging the bottom expanding diameter, the horizontal bearing capacity of the upper part of the pile body is improved, and the resistance of the pile periphery and the pile end is effectively increased.

The outer joint assembly and outer joint seat 240 in the drill pipe assembly 2 and the second outer joint assembly and second outer joint seat 9240 in the drill pipe assembly 92 are identical in structural shape, and because they are respectively located in different parts, the names and labels of the outer joint assemblies and outer joint seats are respectively distinguished.

Various changes and modifications may be made to the invention without departing from the general inventive concept, and, if the same or equivalent thereto is made, the invention is also within the scope of the invention.

Claims (3)

1. A reamer mixing drill assembly comprising: auger stem (1), reamer bit (9) with helical blades and extension arm, wherein:

the screw drill rod (1) comprises a hollow drill rod body (10) with a male connector body (11) and a female connector socket (12) which are provided with through holes, screw blades (16) arranged on the outer wall of the hollow drill rod body, a drill rod oil pipe combination (2) arranged in the hollow rod body, and a drill rod slurry pipe (3) with a bracket (32), an upper end check ring (248), an upper end seal ring (249), a lower end check ring (258) and a lower end seal ring (259), wherein:

the male joint body (11) comprises a first step-shaped step (112) positioned in the through hole of the upper end surface of the male joint body, a male joint journal (113) positioned on the outer wall of the upper part of the male joint body and a first transverse semicircular groove (114) positioned on the outer wall of the middle part of the male joint body; the female joint socket (12) comprises a second step (122) and a third step (123) which are positioned in the lower socket, a second transverse semicircular groove (124) positioned on the inner wall of the middle part of the female joint socket and a locking screw hole (125) communicated with the second transverse semicircular groove;

The drill pipe and oil pipe assembly (2) comprises two sets of drill pipe built-in pipelines (27, 27') which are arranged in parallel and provided with an outer joint assembly, an inner joint assembly and a first hard pipe (26) arranged between the outer joint assembly and the inner joint assembly, an outer joint seat (240), an inner joint seat (250) and a plurality of brackets (22), wherein:

the outer joint seat (240) comprises a base with two symmetrical first jacks (2401, 2401 ') and first grouting holes (2403, 2403 '), and a flange which is connected above the base and provided with opposite first notches (2402, 2402 '), wherein the flange is also provided with an outer seat flange groove (2406) positioned on the outer circle of the flange, an outer seat flange pin hole (2404) and an outer seat flange screw hole (2405) on the end face of the flange;

the outer joint assembly comprises a first outer joint (245), a quick male joint (246), a circlip (44) and a first O-ring (55); wherein, the first outer joint (245) is provided with a convex ring at the upper part of the outer wall thereof, when being arranged in the outer joint seat (240), the first outer joint is placed on the bottom end of the base socket of the outer joint seat through the convex ring, and the outer wall thereof is divided into an upper first journal (2453) and a lower second journal (2452) by taking the convex ring as a boundary; the first outer joint (245) further comprises an outer upper end counter bore (2451) serving as an inner hole in the corresponding position of the first journal (2453), an outer lower end counter bore (2454) serving as an inner hole in the corresponding position of the second journal (2452), and an outer groove (24522) and an outer annular groove (24521) which are arranged on the outer wall opposite to the base of the outer joint seat (240);

The inner joint seat (250) comprises a base with two symmetrical second sockets (2501, 2501 ') and second grouting holes (2503, 2503 ') and a flange which is connected below the base and is provided with opposite second notches (2502, 2502 '), an inner seat flange groove (2506) positioned on the outer circle of the flange and an inner seat flange pin hole (2504) and an inner seat flange screw hole (2505) on the end face of the flange;

the inner joint assemblies comprise a first inner joint (251), a guide sleeve (253), a guide rod (252), a second inner joint (255), a belleville spring (254), a quick female joint (256), a circlip (44), a first O-shaped ring (55), a framework seal (66), a second O-shaped ring (77) and a third O-shaped ring (88); wherein,,

the second inner joint (255) is provided with a convex ring at the upper part of the outer wall thereof, when being arranged in the inner joint seat (250), the second inner joint is placed on the top end of the base socket of the inner joint seat through the convex ring, and the outer wall thereof is divided into an upper fourth journal (2552) and a lower inner and outer thread (2553) by taking the convex ring as a boundary; the second inner joint (255) further comprises an inner two-groove (25522) and an inner two-ring groove (25521) which are arranged on the outer wall opposite to the base of the inner joint seat (250) and serve as inner two upper end counter bores (2555) in the inner holes at the corresponding positions of the fourth shaft neck (2552);

The guide sleeve (253) is provided with a sleeve internal thread (2533), a sleeve middle through hole (2532) and a sleeve lower end counter bore (2531) from bottom to top in sequence, and the guide sleeve (253) further comprises a sleeve internal groove (25311) and a sleeve internal annular groove (25312) which are positioned on the inner wall of the sleeve lower end counter bore (2531);

the guide rod (252) is a stepped rod with a head, and is provided with a rod journal (2522), rod threads (2521) and a rod through hole (2523);

an inner upper end counter bore (2514), an inner thread (2513), an inner middle step hole (2512) and an inner lower end counter bore (2511) are arranged in an inner hole of the first inner joint (251), and the inner joint further comprises an inner annular groove (25141) positioned on the inner wall of the inner upper end counter bore (2514);

a plurality of brackets (22) are arranged in the drill pipe slurry pipe (3) and are provided with two symmetrical pipeline through holes (221, 221 '), two symmetrical third grouting holes (223, 223') and a bracket ring groove (220);

the reaming bit (9) comprises a hollow bit body (90), an outer joint body (91) provided with a through hole and positioned above the hollow bit body, a bit oil pipe combination (92) positioned in the hollow bit body hole, a bottom flange (93) provided with a grouting hole (931) and positioned below the hollow bit body, a reaming mechanism (94) provided with an expansion arm (941) and an expansion cylinder (942) and respectively arranged inside and outside the hollow bit body (90), an oil distribution ring (922) positioned above the expansion cylinder, a grouting pipe (97) penetrating the expansion cylinder and the oil distribution ring, an upper spiral wing (96) arranged on the outer wall of the hollow bit body (90) and positioned above the expansion arm (941), a lower spiral wing (98) positioned below the expansion arm (941) and provided with a cutting blade body, an inner blade body (99) positioned on the end face of the bottom flange, an upper end retainer ring (248) and an upper end sealing ring (249), wherein:

The outer joint body (91) comprises a fourth step (912) positioned in the through hole of the upper end surface of the outer joint body, an outer joint journal (913) positioned on the outer wall of the upper part of the outer joint body, a third transverse semicircular groove (914) positioned on the outer wall of the middle part of the outer joint body and a fifth step (916) positioned at the bottom of the outer joint body;

the drill bit oil pipe combination (92) comprises a second outer joint seat (9240), an oil distributing ring (922), two groups of drill bit built-in pipelines (927, 927') which are arranged in parallel and provided with a second outer joint assembly comprising a second outer joint (9245), a second quick male joint (9246), a circlip (44) and a first O-shaped ring (55), and a second hard pipe (926) which is arranged between the second outer joint (9245) and the oil distributing ring and provided with a hard pipe upper joint body (9261) and a hard pipe lower joint body (9262); wherein,,

the second outer joint (9245) is provided with a convex ring at the upper part of the outer wall, when the second outer joint is installed in the second outer joint seat (9240), the second outer joint is placed on the bottom end of the base socket of the second outer joint seat through the convex ring, and the outer wall of the second outer joint is divided into an upper outer two upper journals (92453) and a lower outer two lower journals (92452) by taking the convex ring as a boundary; the second outer joint (9245) further comprises an outer two upper end counter bore (92451) serving as an inner hole in the corresponding position of the outer two upper shaft necks (92453), an outer two lower end counter bore (92454) serving as an inner hole in the corresponding position of the outer two lower shaft necks (92452), and an outer two groove (924522) and an outer two ring groove (924521) which are arranged on the outer wall opposite to the base of the second outer joint (9245);

The second outer joint seat (9240) comprises a base with two symmetrical third sockets (92401, 92401 ') and fourth grouting holes (92403, 92403 '), and a flange which is connected above the base and is provided with third notches (92402, 92402 ') opposite to the third sockets, the flange is also provided with a second outer seat flange groove (92406) positioned on the outer circle of the flange, and a second outer seat flange pin hole (92404) and a second outer seat flange screw hole (92405) on the end face of the flange;

the oil distributing ring (922) is provided with two axially parallel end face counter bores (9221, 9221 '), two axially parallel straight oil channels (9222, 9222') arranged inside the oil distributing ring, transverse inner oil channels (9223, 9223 ') connecting the end face counter bores and the straight oil channels, an oil ring middle hole (9224) arranged in the oil distributing ring and positioned below the end face counter bores, an oil ring bottom hole (9226) and two oil ring inclined holes (9225,9225');

the method is characterized in that:

the drill rod slurry pipe (3) of the spiral drill rod (1) is fixed in the inner cavity of the hollow drill rod body (10) by welding by utilizing a plurality of brackets (32), and two ends of the drill rod slurry pipe are respectively communicated with the inner holes of the male joint body (11) and the female joint socket (12);

The drill rod oil pipe combination (2) is arranged in the inner hole of the drill rod slurry pipe (3), two first hard pipes (26) respectively penetrate through two symmetrical pipeline through holes (221, 221') in the plurality of brackets (22) and fix the brackets on the outer wall of the first hard pipes (26), and bracket ring grooves (220) of the plurality of brackets (22) are arranged in the inner hole of the drill rod slurry pipe (3) after O-shaped sealing rings are arranged; the upper end of the drill pipe oil pipe combination (2) is fixed at the bottom of a first step-shaped step (112) of the male joint body (11) in a mode of installing an upper end retainer ring (248) on the outer side surface of an outer joint seat (240), an upper end sealing ring (249) is installed in an outer seat flange groove (2406), and an outer seat flange pin hole (2404) and an outer seat flange screw hole (2405) on the flange end surface of the drill pipe oil pipe combination are respectively positioned and fastened by positioning pins; the lower end of the inner joint socket (250) is fixed at the bottom of a second step (122) of the female joint socket (12) by installing a lower end retainer ring (258) on the outer side surface of the inner joint socket, a lower end sealing ring (259) is installed in an inner seat flange groove (2506), and an inner seat flange pin hole (2504) and an inner seat flange screw hole (2505) on the flange end surface of the inner joint socket are respectively positioned by adopting a positioning pin and fastened by adopting a screw;

The two groups of built-in pipelines (27, 27') of the drill rod are respectively formed by connecting a first hard pipe (26), an outer joint assembly and an inner joint assembly, and two ends of the first hard pipe (26) are respectively fixedly arranged in an outer lower end counter bore (2454) of a first outer joint (245) and inner two upper end counter bores (2555) of a second inner joint (255);

the outer joint assemblies of the two groups of built-in drill rod pipelines (27, 27 ') are respectively inserted into two symmetrical first sockets (2401, 2401') in the outer joint seat (240) through a second journal (2452) of a first outer joint (245) and are fixed in a manner of installing an elastic retainer ring (44) in an outer groove (24522), and a first O-shaped ring (55) is installed in the outer annular groove (24521); a quick male connector (246) is arranged in a counter bore (2451) at the upper end of the first outer connector (245);

the inner joint assemblies of the two groups of built-in pipelines (27, 27 ') of drill rods are respectively inserted into two symmetrical second sockets (2501, 2501') in the inner joint seat (250) through fourth journals (2552) of the second inner joint (255) and fixed in a mode of installing elastic check rings (44) in inner two grooves (25522), and a first O-shaped ring (55) is installed in the inner two annular grooves (25521);

The guide rod (252) is screwed with an internal thread (2513) in an inner hole of the first inner joint (251) through a rod thread (2521) at the lower end of the guide rod and a sleeve lower end counter bore (2531) of the guide sleeve (253), a rod shaft neck (2522) of the guide rod is arranged in a sleeve lower end counter bore (2531) of the guide sleeve (253), and a sleeve inner groove (25311) and a sleeve inner ring groove (25312) of the sleeve lower end counter bore (2531) are respectively provided with a framework seal (66) and a third O-shaped ring (88);

the belleville springs (254) are formed by overlapping one group of 2 sheets and after overlapping, and are arranged in a sleeve middle through hole (2532) of the guide sleeve (253) and are positioned between the upper end face of the guide rod (252) and the lower end face of the second inner joint (255);

the guide sleeve (253) is screwed on the inner and outer threads (2553) at the lower end of the second inner joint (255) through the sleeve inner threads (2533) at the upper end of the guide sleeve;

a second O-ring (77) is arranged in an inner annular groove (25141) of an inner upper end counter bore (2514) of the first inner joint (251); a quick female connector (256) is arranged in an inner middle step hole (2512) of the first inner connector (251);

when the outer joint body (91) of the reaming bit (9) is inserted into the female joint socket (12) at the lower end of the spiral drill rod (1), the outer joint journal (913) of the outer joint body is matched with the third step-shaped step (123) of the female joint socket (12) of the spiral drill rod (1), the third transverse semicircular groove (914) positioned on the outer wall of the outer joint body (91) and the second transverse semicircular groove (124) positioned on the inner wall of the female joint socket (12) of the spiral drill rod (1) form a relatively matched locking pin hole, the outer joint body (91) of the reaming bit (9) is locked after the joint pin is inserted, and finally the outer joint body (91) of the reaming bit (9) is completely locked in the female joint socket (12) of the spiral drill rod (1) after the locking bolt is screwed in the locking screw hole (125), so that the upper spiral drill rod (1) is firmly connected with the reaming bit (9) below;

The two drill bit built-in pipelines (927, 927') of the drill bit oil pipe combination (92) are respectively formed by connecting a second hard pipe (926) and a second outer joint assembly, the upper end of the drill bit built-in pipeline is fixed at the bottom of a fourth step (912) of the outer joint body (91) in a mode of installing a second upper end retainer ring (9248) on the outer side surface of a second outer joint seat (9240), a second outer seat flange groove (92406) is provided with a second upper end sealing ring (9249), and a second outer seat flange pin hole (92404) and a second outer seat flange screw hole (92405) on the flange end surface of the drill bit oil pipe combination are respectively fastened by adopting a positioning pin to position and screw;

the upper ends of the two second hard pipes (926) are respectively fixedly arranged in outer two lower end counter bores (92454) of the second outer joint (9245) through a hard pipe upper joint body (9261), the lower ends of the two second hard pipes are connected with two end face counter bores (9221, 9221 ') of the oil distributing ring (922) through hard pipe lower joint bodies (9262), the two end face counter bores (9221, 9221') are respectively communicated with two straight oil passages (9222, 9222 ') through two transverse inner oil passages (9223, 9223'), and the oil distributing ring (922) is fixedly arranged together with an expansion oil cylinder (942) of the reaming mechanism (94) through screws and is arranged in a hole of the hollow drill bit body (90); the two straight oil channels (9222, 9222') are communicated with two straight oil channels arranged in a piston rod at the upper end of the expansion oil cylinder (942);

The second outer joint assemblies of the two groups of the built-in drill bit pipelines (927, 927 ') are respectively inserted into two symmetrical third sockets (92401, 92401') in the second outer joint seat (9240) through outer two lower journals (92452) of the second outer joint (9245) and are fixed in a mode of installing elastic check rings (44) in outer two grooves (924522), and a first O-shaped ring (55) is installed in the outer two annular grooves (924521); a second quick male connector (9246) is arranged in a counter bore (92451) at the outer two upper ends of the second outer connector (9245);

the grouting pipe (97) penetrates through the inner cavity of the expansion oil cylinder (942), the upper end of the grouting pipe is arranged in an oil ring bottom hole (9226) of the oil distribution ring (922), and the oil ring bottom hole is connected with an oil ring middle hole (9224) and two oil ring inclined holes (9225,9225'); the lower end of the flange is fixedly arranged in a central counter bore of the bottom flange (93);

the lower blade edge (161) of the helical blade (16) on the outer wall of the hollow drill rod body (10) of the helical drill rod (1) is mutually attached to the upper blade edge (961) of the upper helical blade (96) on the outer wall of the hollow drill bit body (90) of the reaming bit (9) so as to smoothly combine the helical blade (16) with the upper helical blade (96);

When the male joint body (11) of one spiral drill rod (1) is inserted into the female joint socket (12) of the other spiral drill rod (1), the male joint journal (113) of the male joint body is cooperatively arranged on the third step (123) of the female joint socket (12), the first transverse semicircular groove (114) positioned on the outer wall of the male joint body (11) and the second transverse semicircular groove (124) positioned on the inner wall of the female joint socket (12) form opposite butt locking pin holes, the male joint body (11) is locked after the joint bolt is inserted, and finally the male joint body (11) is completely locked in the female joint socket (12) after the locking bolt is screwed in the locking screw hole (125), so that the upper spiral drill rod and the lower spiral drill rod are firmly connected.

2. A reaming and stirring drilling assembly as defined in claim 1, characterized in that the axial centreline of said two built-in drill pipe (27, 27') has a parallelism tolerance requirement of 0.08-0.10mm with respect to the flange outer circles of the outer joint seat (240) and the inner joint seat (250); the axial center lines of the two drill bit built-in pipelines (927, 927') are required to be 0.08-0.10mm in parallelism tolerance relative to the second outer joint seat (9240) and the flange excircle of the oil distributing ring (922).

3. A reaming and stirring drilling assembly as defined in claim 1, characterized in that said belleville springs (254) in said nipple assembly are mounted to said sleeve central through hole (2532) of said guide sleeve (253) with an initial compression force of 2.0kN or more and a compression force of 4.0kN or more after 2.10mm of re-compression.