CN110872838A

CN110872838A - Drill body

Info

Publication number: CN110872838A
Application number: CN201811010914.0A
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-03-10
Also published as: AU2019330308A1; WO2020042846A1; ZA202102137B; AU2019330308B2

Abstract

The invention discloses a drill body, which comprises: a hollow transmission shaft; the hollow drill rod is sleeved on the hollow transmission shaft in the axial direction and rotates integrally with the hollow transmission shaft; wherein the hollow transmission shaft is provided with an upper discharge port and a lower discharge port at intervals along the axial direction; the hollow drill rod is provided with an upper nozzle and a lower nozzle at intervals along the axial direction; the hollow drill rod can axially reciprocate relative to the hollow transmission shaft, and the lower discharge hole is communicated with the lower nozzle when drilling; and when the drill is withdrawn, the upper discharge hole is communicated with the upper nozzle. The drilling body of structure like this, when advancing to bore or moving back to bore, need not artificial switching conduction mode and can realize corresponding required lower nozzle and spout fluid or go up the nozzle and spout the fluid automatically, and then can make the drilling body evenly stir in order to guarantee the overall structure intensity of cement soil mixing pile.

Description

Drill body

Technical Field

The invention relates to the field of pile foundation construction, in particular to a drill body for pile foundation construction.

Background

A cement-soil mixing pile is used to reinforce the saturated and soft clay foundation, and features that cement is used as solidifying agent, the deep soft soil and solidifying agent are forcibly mixed by special mixing machine, and the solidified agent and soft soil are chemically and physically reacted to form a high-quality foundation with high integrity, water stability and strength.

When the existing pile machine is used for construction operation of a cement-soil mixing pile, bottom guniting is carried out when drilling is carried out in a mode that a guniting port is arranged at the lower end part of a drill rod, cement paste cannot be stirred when the drill rod rotates reversely and retreats from drilling, so that stirring is uneven, and the overall structural strength of the cement-soil mixing pile is further influenced.

In order to solve the problems, the prior art provides a cement mixing pile device capable of converting guniting up and down, which comprises a drill rod, a combined grout inlet pipe and a pneumatic control valve, wherein the combined grout inlet pipe is arranged in the drill rod and is sequentially and axially communicated; the pneumatic control valve controls the switching and the conduction of the upper slurry spraying port, the lower slurry spraying port and the combined slurry inlet pipe through inflation and exhaust.

Although the cement mixing pile device can realize the guniting at the bottom of the drill rod during drilling down and the guniting at the upper part of the drill rod during lifting, the switching conduction of the upper guniting port, the lower guniting port and the combined type grout inlet pipe needs to be realized by pulling a mode of a pneumatic control valve control switch so as to realize operation control, and therefore, the automation degree is poor. .

Disclosure of Invention

The invention aims to solve the problem that the existing drill rod is lack of automatic control for switching and conducting the upper nozzle and the lower nozzle.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a drill body having the following features, comprising:

a hollow transmission shaft; and

the hollow drill rod is sleeved on the hollow transmission shaft in the axial direction and rotates integrally with the hollow transmission shaft;

the axial length of the hollow transmission shaft is greater than that of the hollow drill rod, and the hollow transmission shaft is provided with an upper discharge hole and a lower discharge hole at intervals along the axial direction; the hollow drill rod is provided with an upper nozzle and a lower nozzle at intervals along the axial direction;

the hollow drill rod can axially reciprocate relative to the hollow transmission shaft, and the lower discharge hole is communicated with the lower nozzle when drilling; and when the drill is withdrawn, the upper discharge hole is communicated with the upper nozzle.

Further, the drill body has the following characteristics: the distance between the upper nozzle and the lower nozzle is L1, the distance between the upper discharge port and the lower discharge port is L2, the caliber of the upper discharge port is diameter D, and the sum of the distance L2 and the diameter D is equal to the distance L1;

the hollow drill rod is axially provided with a waist-shaped hole, the hollow transmission shaft is radially provided with a stop lever penetrating through the waist-shaped hole, and the reciprocating distance of the stop lever in the waist-shaped hole is equal to the diameter D.

Further, the drill body has the following characteristics: the hollow transmission shaft comprises an upper shaft section and a lower shaft section which are axially butted, and an output shaft of the power device is axially connected with the upper shaft section;

the hollow drill rod shaft is sleeved on the lower shaft section of the hollow transmission shaft outwards, and the upper discharge port and the lower discharge port are arranged on the lower shaft section of the hollow transmission shaft at intervals;

the periphery wall of the lower shaft section is provided with at least one straight plane, and the hollow drill rod is provided with a profiling hole matched with the lower shaft section along the axial direction on the top end face.

Further, the drill body has the following characteristics: further comprising: and the two ends of the elastic element are respectively abutted against the hole bottom of the profiling hole and the lower end part of the lower shaft section.

Further, the drill body has the following characteristics: the lower extreme of hollow drill rod is provided with the cutting portion, the cutting portion contains:

a drill tip formed with a cutting edge; and

at least one circle of spiral wings which are arranged on the outer peripheral surface of the hollow drill rod and are close to the drill tip;

wherein the spiral wing forms a continuous cutting edge on the radial end surface close to the drill tip;

or a plurality of detachable relieving teeth are arranged on the radial end surface of the spiral wing close to the drill tip.

Further, the drill body has the following characteristics: the drill point is provided with at least two spiral cutting edges around the central axis, and the spiral cutting edges are distributed at intervals around the central axis of the central drill rod.

Further, the drill body has the following characteristics: a plurality of stirring blades are arranged on the peripheral wall of the hollow drill rod at intervals, and the maximum rotation diameter of the stirring blades around the central axis of the hollow drill rod is smaller than or equal to the maximum drilling diameter of the hollow drill rod.

Further, the drill body has the following characteristics: every two to five stirring blades are arranged around the central axis of the hollow drill rod to form a radial stirring blade group, and the radial stirring blade groups are arranged at intervals along the central axis of the hollow drill rod;

alternatively, each of the stirring blades may be arranged spirally around the outer peripheral wall of the drill rod.

Further, the drill body has the following characteristics: the stirring blades are obliquely arranged relative to the cross section of the hollow drill rod.

Further, the drill body described above further has the following features, and further includes: the power device drives the hollow transmission shaft to rotate; and

the rigid outer pipe is axially sleeved on the upper shaft section of the hollow transmission shaft, and the top of the rigid outer pipe supports the power device;

an output shaft of the power device is axially connected with the upper shaft section, and the bottom of the rigid outer tube is movably connected with the upper shaft section through a sliding sleeve or a bearing;

the circumferential surface of the upper end of the rigid outer pipe is provided with at least one radial channel, and the inner circumferential wall of the rigid outer pipe is provided with an annular groove communicated with the radial channel;

further, the drill body has the following characteristics: the hollow transmission shaft is provided with a radial hole for communicating the self axle center hole with the annular groove,

or the output shaft is provided with an axial hole communicated with a central shaft hole of the hollow transmission shaft, and the output shaft is provided with a radial hole communicated with the annular groove and the axial hole;

or the rigid outer pipe is connected with the power device through a cylinder, an annular groove is formed in the inner peripheral wall of the cylinder, radial holes for communicating the outer peripheral wall of the cylinder with the annular groove are formed in the cylinder along the radial direction, an output shaft penetrating through the cylinder is provided with an axial hole for communicating with a central hole in the hollow transmission shaft, and the output shaft is provided with a radial hole for communicating the annular groove with the axial hole.

According to the drill body structure provided by the invention, the hollow drill rod can axially reciprocate relative to the hollow transmission shaft, when drilling is carried out, under the resistance action of a cut body, the hollow drill rod axially moves upwards relative to the hollow transmission shaft so that the upper discharge port is isolated from the upper nozzle, the lower discharge port is communicated with the lower nozzle, and at the moment, the lower nozzle can spray fluid to a drilling area; when the drill is withdrawn, under the action of the dead weight of the hollow drill rod, the hollow drill rod moves downwards relative to the hollow transmission shaft in the axial direction to enable the lower discharge port to be isolated from the lower nozzle, the upper discharge port is communicated with the upper nozzle, and at the moment, the lower nozzle can spray fluid to the stirring area. Such structural design, when boring the body and advancing to bore or move back to bore, need not artificial switching on mode and can realize corresponding required lower nozzle and spout fluid or upper nozzle and spout the fluid, and then can make the body of boring evenly stir in order to guarantee the overall structure intensity of cement soil mixing pile.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a perspective view of a drill body according to one embodiment.

FIG. 2 is a front view of a drill body according to one embodiment.

FIG. 3 is a schematic structural view of a lower shaft segment in accordance with one embodiment.

FIG. 4 is an axial cross-sectional view of a hollow drill rod according to an embodiment.

Figure 5 is an axial cross-sectional view of a drill body according to a first embodiment.

Fig. 6 is an enlarged view of a portion corresponding to the letter a in fig. 5.

Fig. 7 is an enlarged view of a portion corresponding to the letter B in fig. 5.

FIG. 8 is a schematic view of the assembly of the hollow drill rod and the lower shaft section in the second embodiment.

FIG. 9 is a schematic view showing the internal structure of the drill body in the top position of the rigid outer tube in the third embodiment.

FIG. 10 is a schematic view of the internal structure of the drill body in the top position of the rigid outer tube in the fourth embodiment.

In the drawings:

100. a drill body;

1. a hollow transmission shaft; 11. an upper shaft section; 12. a lower shaft section; 121. a feeding hole and a discharging hole; 122. a lower discharge hole; 123. flat surface; 124. a stop lever; 13. a shaft center hole; 14. a radial bore; 15. a hub;

2. a power plant; 21. an output shaft; 211. an axial bore; 212. a radial bore;

3. a hollow drill rod; 31. an upper nozzle; 32. a lower nozzle; 33. profiling a hole; 34. a cutting portion; 341. drilling a tip; 342. a helical wing; 343. a cutting edge; 344. relieving teeth; 35. a stirring blade; 36. a kidney-shaped hole;

4. an elastic element;

5. a rigid outer tube; 51. a radial channel; 52. an annular groove;

6. a seal body;

7. an arc-shaped cover; 71. a tapered wedge surface; 72. a fastener;

8. a sliding sleeve;

9. a cylinder; 91. an annular groove; 92. a radial bore.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.

< example one >

As shown in fig. 1, 2 and 5, the drill body 100 according to the present embodiment is used for pile foundation construction in the case of a cement-soil mixed pile, and the drill body 100 includes: the device comprises a hollow transmission shaft 1, a power device 2, a hollow drill rod 3 and a rigid outer pipe 5.

As shown in fig. 1 and 2, the lower end of the hollow drill rod 3 is provided with a cutting part 34, the cutting part 34 comprises a drill tip 341 and at least one circle of spiral wings 342, specifically, the drill tip 341 is provided with a cutting edge 343, and the spiral wings 342 are arranged on the outer circumferential surface of the hollow drill rod 3 and close to the drill tip 341; the spiral wing 342 is welded and fixed with the hollow drill rod 3. The helical flight 342 has a plurality of removable teeth 344 arranged on a radial end surface adjacent the drill tip 341. Of course, the present invention provides a drill body 100 in which the helical fins 342 form a continuous cutting edge on the radial end surface near the drill tip 341.

As shown in fig. 1 and 2, in the present embodiment, as a preferred technical solution, at least two helical cutting edges 343 with a helix angle of 5 ° to 85 ° are disposed on the drill tip 341 around the central axis, and the helical cutting edges 343 are spaced around the central axis of the central drill rod. The rod body of the hollow drill rod 3 and the drill tip 341 are welded and fixed, or the hollow drill rod 3 and the drill tip 341 are screwed and fixed by fasteners not shown in the figure, or the hollow drill rod 3 and the drill tip 341 are screwed and fixed axially.

As shown in fig. 1 and 2, a plurality of stirring blades 35 are spaced apart from the outer circumferential wall of the hollow drill rod 3, and the stirring blades 35 extend radially outward from the outer circumferential wall of the hollow drill rod 3. Of course, the rigid outer tube 5 can likewise be provided with a plurality of stirring blades 35 which are not shown in the figures. And the maximum rotation diameter of the stirring blade 35 around the central axis of the hollow drill rod 3 is smaller than or equal to the maximum drilling diameter of the hollow drill rod 3, so that the stirring blade 35 can be ensured to fully and uniformly stir the cut and crushed objects or solid-liquid mixtures.

As shown in fig. 2, as a preferred technical solution, every two to five stirring blades 35 are arranged around the central axis of the hollow drill rod 3 to form a radial stirring blade group, and each radial stirring blade group is arranged at intervals along the central axis of the hollow drill rod 3. When a plurality of drill bodies 100 with similar structures are combined into a whole to carry out pile foundation construction, the structural design can avoid the mutual interference among the drill bodies 100.

As shown in fig. 1 and 2, in order to reduce the axial movement resistance of the drill body 100 during drilling or withdrawal, the stirring blades 35 are arranged in an inclined manner with respect to the cross section of the hollow drill rod 3. In detail, the length direction of the stirring blade 35 is perpendicular to the axial direction of the hollow drill rod 3, and the blade surface of the stirring blade 35 is inclined to the central axis of the hollow drill rod 3.

Of course, in the drill body 100 provided by the present invention, for a single operated drill body 100 or a combination drill composed of a plurality of drill bodies 100 with similar structures to perform pile foundation construction, when the spacing between the drill bodies 100 is large enough and/or the mutual rotation speed and rotation direction are constant, the stirring blades 35 may be arranged spirally around the outer circumferential wall of the hollow drill rod 3.

As shown in fig. 3 to 5, the axial length of the hollow transmission shaft 1 is greater than the axial length of the hollow drill rod 3, the hollow transmission shaft 1 includes an upper shaft section 11 and a lower shaft section 12, the hollow transmission shaft 1 is provided with an upper discharge port 121 and a lower discharge port 122 at an interval along the axial direction, preferably, the discharge port 121 and the lower discharge port 122 are provided at the lower shaft section 12 of the hollow transmission shaft 1 at an interval; the hollow drill rod 3 is provided with an upper nozzle 31 and a lower nozzle 32 at intervals in the axial direction. When drilling, the hollow transmission shaft 1 moves downwards relative to the hollow drill rod 3 in the axial direction, so that the lower discharge hole 122 is communicated with the lower nozzle 32, and the upper discharge hole 121 is isolated from the upper nozzle 31; when the drill is withdrawn, the hollow drive shaft 1 moves upward relative to the hollow drill rod 3 so that the upper discharge port 121 and the upper nozzle 31 are communicated, and the lower discharge port 122 and the lower nozzle 32 are isolated.

As shown in fig. 3 to 5, in particular, the power device 2 is used for driving the hollow transmission shaft 1 to rotate, and the upper shaft section 11 and the lower shaft section 12 are axially butted by the shaft hub 15 and integrally and synchronously rotate. As shown in the figure, the output shaft 21 of the power device 2 is axially connected with the upper shaft section 11 through a shaft hub. And the hollow drill rod 3 can axially reciprocate relative to the hollow transmission shaft 1.

As shown in fig. 3 to 5, the hollow drill rod 3 is axially sleeved on the hollow transmission shaft 1 and integrally rotates with the hollow transmission shaft 1. Specifically, the hollow drill rod 3 is axially sleeved on the lower shaft section 12 of the hollow transmission shaft 1. The peripheral wall of lower shaft section 12 has at least a straight plane 123, and hollow drilling rod 3 sets up the profile modeling hole 33 that matches lower shaft section 12 along the axial in the top terminal surface, and such structural design can prevent that hollow drilling rod 3 from rotating for hollow transmission shaft 1 circumferential direction.

As shown in fig. 3 to 5, in the present embodiment, the distance between the upper nozzle 31 and the lower nozzle 32 is a linear distance L1, the distance between the upper discharge hole 121 and the lower discharge hole 122 is a linear distance L2, and the caliber of the upper discharge hole 121 is a diameter D, in order to ensure that the lower discharge hole 122 and the lower nozzle 32 are completely conducted during drilling, the upper discharge hole 121 and the upper nozzle 31 are completely conducted during withdrawal, and the sum of the linear distance L2 and the diameter D is equal to the linear distance L1.

As shown in fig. 5 and 6, in order to prevent the axial separation of the hollow drill rod 3 and the hollow transmission shaft 1 when the drill body 1 is withdrawn, the hollow drill rod 3 is provided with a kidney-shaped hole 36 along the axial direction, the lower shaft section 12 is provided with a stop lever 124 penetrating through the kidney-shaped hole 36 along the radial direction, and the stop lever 124 reciprocates along the axial direction of the hollow drill rod 3 relative to the hollow transmission shaft 1, i.e. the stop lever 124 and the kidney-shaped hole 36 are combined to form the separation-preventing device. However, it should be ensured that the reciprocating distance of the stop rod 124 in the kidney-shaped hole 36 is equal to the diameter D of the upper discharge hole 121, and such a size design can ensure that the lower discharge hole 122 and the lower nozzle 32 are completely communicated when the drill body drills; when the drill is retreated, the upper discharge hole 121 and the upper nozzle 31 are completely communicated.

As shown in fig. 5 and 6, in order to prevent the broken body from entering the kidney-shaped hole 36 during the construction of the pile foundation and affecting the reciprocating travel of the stop lever 124, the stop lever 124 can be further provided with an arc-shaped cover 7 which is close to the outer peripheral wall of the hollow drill rod 3, the arc-shaped cover 7 moves synchronously with the stop lever 124, and the arc-shaped cover 7 can effectively cover the kidney-shaped hole 36 no matter which end of the kidney-shaped hole 36 the stop lever 124 is located. Of course, the arc cover 7 and the stop lever 124 are preferably detachably connected by the fastening member 72, and the structure is designed to periodically perform cleaning and maintenance after the arc cover 7 is removed even if a part of the micro-crushed bodies enters the kidney-shaped hole 36.

As shown in fig. 5 and 6, it is more preferable that both ends of the arc cover 7 are formed as tapered surfaces 71 in the axial direction of the drill body 100, that is, both ends of the arc cover 7 have blade bodies formed by the tapered surfaces 71, and such a structure is designed to scoop crushed bodies or solid-liquid mixtures with adhesive bodies attached to the outer circumferential wall of the hollow drill rod 3 while the arc cover 7 reciprocates.

As shown in fig. 2, 5 and 7, in the present embodiment, the rigid outer tube 5 is axially sleeved on the upper shaft section 11 of the hollow transmission shaft 1, and the power device 2 is supported at the top, and the bottom of the rigid outer tube 5 is movably connected with the upper shaft section 11 by the sliding sleeve 8, so that the upper shaft section 11 can freely rotate relative to the rigid outer tube 5. Specifically, the rigid outer tube 5 is connected with the power device 2 through a cylinder 9, an annular groove 91 is formed in the inner peripheral wall of the cylinder 9, a radial hole 92 communicating the outer peripheral wall of the cylinder 9 with the annular groove 91 is formed in the cylinder 9 in the radial direction, an axial hole 211 communicating with a central axis hole 13 in the hollow transmission shaft 1 is formed in an output shaft 21 penetrating through the cylinder 9, and a radial hole 212 communicating the annular groove 91 with the axial hole 211 is formed in the output shaft 21.

As shown in fig. 2, 5 and 7, a slight radial clearance is provided between the output shaft 21 of the power device 2 and the cylinder 9 to ensure that the output shaft 21 can rotate freely relative to the cylinder 9, and in order to prevent fluid (gas or cement slurry) from entering and interfering with the normal operation of the power device 2 and the freedom of movement of the hollow transmission shaft 1 relative to the rigid outer pipe 5, the cylinder 9 is embedded with sealing bodies 6 at two axial sides of the annular groove 91. The sealing member 6 may be single or plural, and the material and structure of each sealing member 6 may be different.

As shown in fig. 2, 5 and 7, in the above-mentioned structure, when the drill body 100 is drilled, the fluid (gas or cement slurry) is conveyed to the lower nozzle 32 to be discharged out of the drill body 100 after passing through the radial hole 92, the annular groove 91, the radial hole 212, the axial hole 211, the axial hole 13 and the lower discharge hole 122 in sequence; when the drill body 100 is retreated, the fluid (gas or cement slurry) is conveyed to the upper nozzle 31 to be discharged out of the drill body 100 after passing through the radial hole 92, the annular groove 91, the radial hole 212, the axial hole 211, the axial hole 13 and the upper discharge hole 121 in sequence.

In the present embodiment, as shown in fig. 2, it is preferable that the fluid discharged from the drill body 100 through the lower nozzle 32 is cement slurry when the drill body 100 is drilled; when the drill body 100 is being drilled out, the fluid exiting the drill body 100 through the upper nozzle 31 is all gas (e.g., compressed air). Of course, when the drill body 100 provided by the present invention is used, the fluids discharged from the drill body 100 through the upper nozzle 31 or the lower nozzle 32 are all cement slurries during the drilling or the withdrawal of the drill body 100.

< example two >

In the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same description is omitted.

As shown in fig. 8, the drill body 100 provided in this embodiment further has such a different structural design as follows: the drill body 100 provided by the present embodiment further includes an elastic element 4, specifically, the elastic element 4 is disposed in the contour hole 33, and two ends of the elastic element 4 respectively abut against the bottom of the contour hole 33 and the lower end of the lower shaft segment 12, so as to ensure that the elastic element 4 works effectively, the elastic deformation amplitude of the elastic element 4 is equal to or greater than the diameter D of the upper discharge hole 121. When the drill body 100 is drilled, the hollow drive shaft 1 presses down the elastic element 4 to shorten it axially, in which case the lower outlet 122 is in communication with the lower nozzle 32.

With respect to the first embodiment, the elastic element 4 functions as: when the drill body 100 retreats from drilling, the axial extrusion force borne by the elastic element 4 is eliminated, and then the two end portions of the elastic element 4 respectively push against the hole bottom of the profiling hole 33 and the lower end portion of the lower shaft section 12, so that the hollow drill rod 3 is facilitated to move downwards relative to the hollow rotating shaft, and the condition that the upper discharge hole 121 and the upper nozzle 31 are communicated is met. In this embodiment, the elastic element 4 is preferably a compression spring, but of course, in the drill body 100 provided by the present invention, the elastic element 4 may also be a retractable elastic ring made of a material with elastic properties, such as polyurethane.

< example three >

As shown in fig. 9, the drill body 100 provided in this embodiment further has such a different structural design as follows: the upper end periphery of the rigid outer pipe 5 is provided with at least one radial channel 51, the inner periphery wall of the rigid outer pipe 5 is provided with an annular groove 52 communicated with the radial channel 51, and the hollow transmission shaft 1 is provided with a radial hole 14 communicated with the self axis hole 13 and the annular groove 52.

With the structure design, when the drill body 100 drills, fluid (gas or cement slurry) is conveyed to the lower nozzle 32 to be discharged out of the drill body 100 after sequentially passing through the radial channel 51, the annular groove 52, the radial holes 14, the axial hole 13 and the lower discharge hole 122; when the drill body 100 is removed, the fluid (gas or cement slurry) is conveyed to the upper nozzle 31 to be discharged out of the drill body 100 through the radial channel 51, the annular groove 52, the radial hole 14, the axial hole 13 and the upper discharge hole 121 in sequence.

Compared with the first embodiment, the drill body 100 provided by the present embodiment omits the barrel 9, so that the structure of the drill body 100 can be more compact.

< example four >

As shown in fig. 10, the drill body 100 provided in this embodiment further has such a different structural design as follows: the upper end peripheral surface of the rigid outer tube 5 is provided with at least one radial channel 51, the inner peripheral wall of the rigid outer tube 5 is provided with an annular groove 52 communicated with the radial channel 51, the output shaft 21 is provided with an axial hole 211 communicated with the axial hole 13 in the hollow transmission shaft 1, and the output shaft 21 is provided with a radial hole 212 communicated with the annular groove 52 and the axial hole 211.

With the structure design, when the drill body 100 drills, fluid (gas or cement slurry) is conveyed to the lower nozzle 32 to be discharged out of the drill body 100 after sequentially passing through the radial channel 51, the annular groove 52, the radial hole 212, the axial hole 211, the axial hole 13 and the lower discharge hole 122; when the drill body 100 is drilled back, the fluid (gas or cement slurry) is conveyed to the upper nozzle 31 to be discharged out of the drill body 100 through the radial channel 51, the annular groove 52, the radial hole 212, the axial hole 211, the axial hole 13 and the upper discharge hole 121 in sequence.

The technical principles of the present invention have been described above in connection with specific embodiments, but it should be noted that the above descriptions are only for the purpose of explaining the principles of the present invention, and should not be construed as specifically limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will appreciate that other embodiments of the present invention or equivalents thereof without inventive step, are also within the scope of the present invention.

Claims

1. A drill body, comprising:

a hollow transmission shaft; and

2. The drill body of claim 1, wherein the spacing between the upper nozzle and the lower nozzle is a distance L1, the spacing between the port is a distance L2, the port is a diameter D, and the sum of the distance L2 and the diameter D is equal to the distance L1;

3. The drill body of claim 1, wherein the hollow drive shaft comprises axially abutting upper and lower shaft sections;

4. The drill body of claim 3, further comprising: and the two ends of the elastic element are respectively abutted against the hole bottom of the profiling hole and the lower end part of the lower shaft section.

5. Drill body according to claim 1, characterized in that the lower end of the hollow drill rod is provided with a cutting portion comprising:

a drill tip formed with a cutting edge; and

6. The drill body of claim 5, wherein the drill tip is configured with at least two helical cutting edges about a central axis, and wherein the helical cutting edges are spaced about the central axis of the central drill rod.

7. The drill body as claimed in claim 1, wherein a plurality of stirring blades are arranged on the outer circumferential wall of the hollow drill rod at intervals, and the maximum rotating diameter of the stirring blades around the central axis of the hollow drill rod is smaller than or equal to the maximum drilling diameter of the hollow drill rod.

8. The drill body as claimed in claim 7, wherein every two to five stirring blades are arranged around the central axis of the hollow drill rod to form a radial stirring blade group, and the radial stirring blade groups are arranged at intervals along the central axis of the hollow drill rod;

9. Drill body according to claim 7 or 8, characterized in that the stirring blade is arranged obliquely in relation to the cross-section of the hollow drill rod.

10. The drill body of claim 3, further comprising: the power device drives the hollow transmission shaft to rotate; the rigid outer pipe is axially sleeved on the upper shaft section of the hollow transmission shaft, and the top of the rigid outer pipe supports the power device;

the hollow transmission shaft is provided with a radial hole for communicating a self shaft center hole with the annular groove;