CN118292789A - Coring device capable of completely cutting rock and applied to geotechnical engineering investigation - Google Patents

Abstract

The invention discloses a coring device capable of completely cutting rock, which is applied to geotechnical engineering investigation and comprises a coring bit and a core barrel, wherein a coring support is arranged on the inner side of the coring bit in the axial direction, a rotary cutter bit is arranged on the outer side of the coring bit in the axial direction, a drill pipe is arranged on the inner side of the rotary cutter bit in the axial direction, the core barrel is movably connected with the drill pipe, the rotary cutter bit is connected with the coring support in an embedded manner, the rotary cutter bit is in a cone shape with a small upper part and a large lower part, and the inner side end of an arc cutter tooth is positioned at the position opposite to the outer side of an inner diameter opening of the coring support in a normal state. The rotary cutter head with the variable shape is arranged, is used as a structure for assisting in coring when encountering a relatively hard core, can also play a role in supporting a certain inward in a relatively soft core, and ensures the integrity and quality of coring. Meanwhile, a plurality of strip-shaped grooves are formed in the circumferential direction of the core barrel, and after the drill pipe is disassembled, the coring rock stratum can be removed relatively easily.

Description

Coring device capable of completely cutting rock and applied to geotechnical engineering investigation

Technical Field

The invention relates to the technical field of drilling engineering, in particular to a coring device capable of completely cutting rock, which is applied to geotechnical engineering investigation.

Background

In mineral exploration and development, drilling work is required to be performed according to the stratum level and depth of geological design, and therefore, in order to intuitively study the underground structure and the rock deposition environment, understand the fluid properties and the like therein, a coring tool is usually sent into a well, and rock samples are drilled out to measure various properties of the rock.

The coring tool commonly used at present is a coring drilling machine, and the coring drilling machine in the prior art usually performs drilling and coring through a rotary drilling method. That is, the rock is drilled using the mechanical rotation of the drill bit, causing impact damage to the rock, thereby retrieving the broken rock for predicting the geological conditions. However, the cutting area is very large, the efficiency is very low, the energy consumption is high, the time and the labor are wasted, and the cost is high when the drilling is performed.

If the patent number is CN105952406B, the name is "a rock bottom cutting coring bit", it discloses including flange and barrel, and the flange rigid coupling is in the upper end of barrel, and the barrel is inside to be equipped with control room and drive chamber, is equipped with motor, reduction gear, limit switch, stroke control device … … coring speed in the control room, can take out the core monoblock, and has reduced the cutting area, has improved work efficiency. However, in the drilling process, the rock stratum generally has a certain depth, the driving end of the mode is a cutting position from top to bottom, the applicability of the power system is low, and the use efficiency of the power system is relatively low due to the combination of the height problem in a reciprocating cutting mode of a chain belt moving rope saw.

In order to solve the problems, the proposal is generated.

Disclosure of Invention

(One) solving the technical problems

Aiming at the defects of the prior art, the invention provides a coring device which is applied to geotechnical engineering investigation and can completely cut rock, and solves the problems in the background art.

(II) technical scheme

In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a but be applied to coring device of rock is got in complete cutting of geotechnical engineering reconnaissance, includes coring bit, core tube, the axial inboard of coring bit is equipped with coring support, and the axial outside is equipped with the rotary cutter tool bit, the axial inboard of rotary cutter tool bit is equipped with the drill pipe, core tube and drill pipe swing joint, the rotary cutter tool bit links to each other with coring support embedding, the rotary cutter tool bit is big-end-up's cone form, and under the normality, the inboard end of arc sword tooth is in coring support internal diameter mouth relative outside department, receives the effect of outside circumference inwards shrink in the power can progressively inwards imbed coring support bore, and cone form deformation trend is progressively to the column to progressively inwards cut the ground under the rotatory effect that the drive end drove.

Preferably, a plurality of reserved grooves are formed in the circumferential direction of the rotary cutting tool bit, caulking grooves are correspondingly formed in the coring support, the width of the wall surface between two adjacent caulking grooves is matched with the width of the reserved grooves, arc-shaped cutter teeth are formed in the circumferential inner wall of the bottom of the rotary cutting tool bit, and then the arc-shaped cutter teeth can be embedded into the coring support.

Preferably, the rotary cutting tool further comprises a rotary cutting outer cylinder, wherein the radial dimension of the inner diameter of the rotary cutting outer cylinder is larger than the radial dimension of the outer diameter of the core barrel, and the rotary cutting outer cylinder continuously stretches down until an inward converging force is given to the cone-shaped rotary cutting tool bit after falling into the core barrel.

Preferably, the inner wall of the drill pipe is provided with a thread groove, the outer wall of the bottom of the core barrel is provided with external threads with adaptive size, and the external threads and the core barrel can be in threaded connection in a rotating mode.

Preferably, the radial dimension of the bottom of the rock core pipe at the position provided with the screw thread is smaller than that of the main body part, the two parts are connected through a base ring at the joint position, and the whole base ring has a certain metal deformation function.

Preferably, a plurality of strip-shaped grooves are formed in the periphery of the core barrel, and the bottom of the core barrel is screwed into the drill pipe to complete inward shrinkage so as to have certain prestress for shrinkage clamping the rock stratum.

(III) beneficial effects

After the technical scheme is adopted, compared with the prior art, the invention has the following advantages: the rotary cutter head with the variable shape is arranged as a structure for assisting in coring when encountering a relatively hard core, and can also play a role in supporting a certain inward in a relatively soft core. Secondly, the rotary cutting tool bit mainly carries out auxiliary rotary cutting on the interior after coring, reduces disturbance of shaking drilling to stratum in the coring process, and ensures the integrity and quality of coring; meanwhile, a plurality of strip-shaped grooves are formed in the circumferential direction of the core barrel, and after the drill pipe is disassembled, the coring rock stratum can be taken off relatively easily and is not easy to break.

Drawings

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic illustration of the core barrel and coring bit configuration of the present invention shown in an exploded view;

FIG. 3 is a schematic top view of a rotary cutting head structure according to the present invention;

FIG. 4 is a schematic view showing the overall structure of the present invention in a disassembled state;

fig. 5 is a schematic view of the rotary-cut outer cylinder of the present invention after being sleeved.

In the figure: 1. coring bit; 2. core pipe; 3. coring a support; 4. a rotary cutter head; 5. drilling a pipe; 6. a reserved groove; 7. a caulking groove; 8. arc-shaped cutter teeth; 9. rotary cutting the outer cylinder; 10. a thread groove; 11. an external thread; 12. a susceptor ring; 13. and (5) slotting in a strip shape.

Detailed Description

The invention is further illustrated by the figures and examples.

As shown in fig. 1-2: the utility model provides a be applied to coring device that geotechnical engineering reconnaissance can be intact to cut rock, the improvement part is coring and coring cutting part, specifically includes structures such as rotary-cut urceolus 9, coring bit 1, rotary-cut tool bit 4, coring support 3, core barrel 2.

Wherein the coring bit 1 is disposed axially outward of the rotary cutter head 4, and the coring support 3 is disposed axially inward of the coring bit 1. The rotary cutter head 4 is circumferentially provided with a plurality of reserved grooves 6, simultaneously, the coring support 3 is correspondingly provided with caulking grooves 7, the width of the wall surface between two adjacent caulking grooves 7 is matched with the width of the reserved grooves 6, the circumferential inner wall at the bottom of the rotary cutter head 4 is provided with arc-shaped cutter teeth 8, and then the arc-shaped cutter teeth 8 can be locally embedded into the coring support 3.

Referring to fig. 3, the rotary cutting bit 4 serves as a structure for assisting in coring when encountering a relatively hard core, while also providing some inward bearing support in a relatively soft core.

Secondly, the rotary cutting tool bit 4 mainly rotates the inner part after coring, reduces disturbance of shaking drill to stratum in the coring process, and ensures the integrity and quality of coring.

Some relatively hard rock soils, such as granite, are generally encountered, are not easily broken, and are difficult to core. Conventionally, the method is to increase the accelerator at the driving end to shake the drill left and right or to press the drill to fill the drill fully (to take the drill first), so that hard cores are difficult to take out.

Therefore, the rotary cutter head 4 is arranged to be in a cone shape with a small upper part and a large lower part, under a normal state, the inner side end of the arc cutter tooth 8 is positioned at the opposite outer side of the inner diameter opening of the coring support 3, and under the action of the external side circumferential inward shrinkage, the force can be gradually and inwards embedded into the caliber of the coring support 3 so as to gradually and inwards cut the rock and soil under the rotation action driven by the driving end.

Specifically, referring to fig. 4-5, the inner diameter radial dimension of the rotary-cut outer barrel 9 is slightly larger than the outer diameter radial dimension of the core barrel 2, and is continuously straightened until an inward converging force is given to the cone-shaped rotary-cut cutter head 4 after falling into the core barrel 2, so that a plurality of arc-shaped cutter teeth 8 are tightly abutted against the core to be taken out inwards, at the moment, the driving end at the top drives rotation, at the moment, the arc-shaped cutter teeth 8 continuously cut the core, and the core is progressively rotary-cut inwards under the continuous converging force until annular cracks appear at the upper end and the lower end of the core, and at the moment, the firm core is convenient to take down.

It should be noted that, when the rotary-cut outer barrel 9 falls to the top of the core bit 1, it falls to the bottom, and at this time, the arc-shaped cutter tooth 8 is completely embedded into the core support 3 and is cylindrical (of course, the complete deformation state is not required), firstly, deformation is difficult to be realized in consideration of the hardness problem of rotary cutting, and secondly, the deformed dimension cannot be set too large in consideration of the dimension, and only the rotary cutting to a certain depth of the rock core is achieved.

The rotary-cut outer tube 9 itself has a certain weight, and of course, a pressing force may be applied to the upper end.

When the core pipe 2 and the core are taken out, the existing rope which is more commonly used can be adopted to drive the lifting device to pull up for coring, and the driving end can be rotated to drive the conventional drilling machine.

The axial inner side of the rotary cutter head 4 is connected with a drill pipe 5, the inner wall of the drill pipe 5 is provided with a thread groove 10, the outer wall of the bottom of the core barrel 2 is provided with an external thread 11 with the size being adapted, and the drill pipe and the external thread are in threaded connection in a rotating mode.

Because both hard rock, such as granite, and soft rock, such as mudstone, are quite fragile in terms of their physical structure, they are easily broken when they are gripped and are not easily removed relatively completely from the core barrel 2.

Conventionally, a blocking device or a bottom ring step, a tooth seat, internal teeth and the like are annularly arranged in the coring bit 1 to be filled in and blocked in rock strata so as to take out the rock cores relatively, and the rock cores taken out in the mode have relatively poor integrity and are difficult to take out better overall.

Further, the solution of the scheme is as follows: the radial dimension of the bottom of the core pipe 2 at the position provided with the thread is smaller than the radial dimension of the main body part, the two are connected through the base ring 12 at the joint, the whole base ring 12 has a certain metal deformation function, a plurality of strip-shaped grooves 13 are formed in the circumference of the core pipe 2, the dimension is slightly reduced after the bottom of the core pipe 2 is screwed into the drill pipe 5, so that certain prestress for contracting and clamping rock stratum is provided, and further after the drill pipe 5 is disassembled, the core rock stratum can be taken off relatively easily and is not easy to break.

The above-described embodiments are intended to suggest that, in view of the above description, various changes and modifications may be made by the worker without departing from the spirit of the invention. The technical scope of the present invention is not limited to the description, but the scope of protection must be determined according to the scope of claims.

Claims (6)

1. The utility model provides a be applied to coring device that geotechnical engineering reconnaissance can be intact surely gets rock, includes coring bit, core barrel, its characterized in that: the utility model discloses a coring bit, including coring bit, core bit, rotary cutter head, core pipe, drive end, core bit, rotary cutter head, core bit, core pipe, rotary cutter head, core bit, the axial inboard of coring bit is equipped with coring support, the axial outside is equipped with the rotary cutter head, the axial inboard of rotary cutter head is equipped with the drill pipe, core pipe and drill pipe swing joint, the rotary cutter head links to each other with coring support is embedded, the rotary cutter head is little big-end-down's cone form, under the normality, the inboard end of arc sword tooth is in coring support internal diameter mouth relative outside department, the effect that receives outside circumference inwards shrink force can progressively inwards be embedded to coring support bore, and cone form deformation trend is progressively to the column, so as to progressively inwards cut the ground under the rotatory effect that the drive end drove.

2. A coring device for use in geotechnical engineering investigation for complete rock cutting as claimed in claim 1, wherein: the rotary cutter head is circumferentially provided with a plurality of reserved grooves, the coring support is correspondingly provided with caulking grooves, the width of the wall surface between two adjacent caulking grooves is matched with the width of the reserved grooves, the circumferential inner wall of the bottom of the rotary cutter head is provided with arc-shaped cutter teeth, and then the arc-shaped cutter teeth can be embedded into the coring support.

3. A coring device for use in geotechnical engineering investigation for complete rock cutting as claimed in claim 1, wherein: the rotary cutting tool also comprises a rotary cutting outer cylinder, wherein the radial dimension of the inner diameter of the rotary cutting outer cylinder is larger than the radial dimension of the outer diameter of the core barrel, and the rotary cutting outer cylinder continuously extends downwards until the conical rotary cutting tool bit is provided with an inward converging force after falling into the core barrel.

4. A coring device for use in geotechnical engineering investigation for complete rock cutting as claimed in claim 1, wherein: the inner wall of drill pipe is equipped with the screw thread groove, and the external screw thread of size adaptation is seted up to the outer wall of core barrel bottom, and both accessible rotatory mode threaded connection.

5. A coring device for use in geotechnical engineering investigation for complete rock cutting as claimed in claim 4, wherein: the radial dimension of the core barrel bottom at the position provided with the screw thread is smaller than the radial dimension of the main body part, the two parts are connected through the base ring at the joint position, and the whole base ring has a certain metal deformation function.

6. A coring device for use in geotechnical engineering investigation for complete rock cutting as claimed in claim 5, wherein: a plurality of strip-shaped grooves are formed in the periphery of the core barrel, and the bottom of the core barrel is screwed into the drill pipe to complete inward shrinkage so as to have certain prestress for shrinkage and clamping of rock stratum.