CN219587502U - Drilling device for advanced drainage of weak rock stratum separation layer water body - Google Patents

Abstract

The utility model provides a drilling device for advanced drainage of a weak rock stratum separation layer water body. According to the drilling device for advanced drainage of the weak stratum separation layer water body, drilling is carried out through the drill bit, meanwhile, the primary casing pipe and the secondary casing pipe are driven to move into a drilled hole, slurry is conveyed through a casing pipe gap, and the defect that the traditional drainage water is only drilled and not reinforced is overcome; grouting the soft rock damage gap caused by drilling when drilling to the soft water-resisting layer below the water body of the separation layer through the outer spray holes, and reinforcing the water-resisting layer; if a large amount of water is suddenly dredged into in the separation layer water, then increase slurry pump slip casting pressure, make thick liquid get into the clearance between one-level inner tube and the drilling rod by interior hydrojet hole, in time carry out the hole sealing and handle to prevent effectively that the water barrier that the drilling caused from breaking, avoid artificially causing the separation layer water damage.

Description

Drilling device for advanced drainage of weak rock stratum separation layer water body

Technical Field

The utility model relates to the technical field of rock stratum drilling, in particular to a drilling device for advanced drainage of a weak rock stratum separation layer water body.

Background

In the underground mining process of the coal mine, the coal seam overlying strata generate a separation layer, and a part of water-filled separation layer space is broken and is collapsed into the underground in a short time to cause disasters under the influence of factors such as hydrostatic pressure, stress or mining disturbance.

To the prevention of separation layer water damage mainly be to the separation layer water drain in advance, current leading drain drilling equipment is main to the pore wall consolidates in the drilling process to guarantee that the pore-forming is complete, when drilling to the comparatively hard stratum of coal seam roof, it is less to the water proof layer destruction of covering under the separation layer water, can not cause the water proof layer destruction because of the drilling leads to, and then causes the water of separation layer to burst into the condition of stoping face suddenly.

However, when the overlying strata under the water body of the separation layer is softer, the existing drilling equipment can disturb the water-resisting layer in the drilling process to destroy the mechanical balance state between the original strata, so that the water-resisting layer generates cracks, and expands along with continuous invasion of a drill bit, finally under the hydrostatic pressure effect of the water body of the separation layer, the water body of the separation layer breaks through the water-resisting layer to artificially cause the water damage of the separation layer, and the situation that the water-logging working face is caused by the fact that the water-logging working face cannot be timely sealed when the water drainage exceeds the expected drainage amount is faced.

Thus, there is a need to provide a solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The utility model aims to provide a drilling device for advanced drainage of a weak rock stratum separation layer water body, so as to solve or alleviate the problems in the prior art.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides a drilling device for advanced drainage of a weak rock stratum separation layer water body, which comprises: the drill bit, the rotary connecting unit, the primary casing, the secondary casing and the drill rod; the bottom surface of the drill bit is provided with a mounting groove, and the rotary connecting unit is arranged in the mounting groove; the rotary connection unit includes: the device comprises two rotating rings, fixing rings and steel balls, wherein the two rotating rings are symmetrically arranged on two sides of the fixing rings respectively, rotating sliding grooves are formed in the end faces of the rotating rings, which are opposite to the fixing rings, and a plurality of steel balls are arranged in the rotating sliding grooves; the primary sleeve includes: the device comprises a primary inner pipe, a primary outer pipe, a hole sealing cover plate and a film partition plate, wherein the upper ends of the primary inner pipe and the primary outer pipe are detachably and coaxially connected to the bottom surface of the hole sealing cover plate, and stepped bosses are arranged on the inner side wall of the primary outer pipe and/or the outer side wall of the primary inner pipe; the thin film partition plate is positioned on the stepped boss, and a compression spring is arranged between the thin film partition plate and the hole sealing cover plate; the outer side wall of the rotating ring is tightly matched with the mounting groove, and the inner side wall of the fixing ring is connected with the outer side wall of the primary outer tube; the side wall of the primary outer pipe is provided with a plurality of outer liquid spraying holes, the side wall of the primary inner pipe is provided with a plurality of inner liquid spraying holes, and the outer liquid spraying holes and the inner liquid spraying holes are respectively positioned at two sides of the film partition plate; the secondary sleeve is detachably connected to the lower end of the primary sleeve, the side wall of the outer tube of the secondary sleeve is provided with a plurality of outer liquid spraying holes, the bottom end of the secondary sleeve is axially provided with a liquid passing hole, and the liquid passing hole is positioned between the outer tube and the inner tube of the secondary sleeve; the drill rod sequentially passes through the inner pipe of the secondary sleeve and the primary inner pipe and then is connected with the drill bit.

Preferably, the bottom of drill bit is detachably connected with and compresses tightly the end cover, it is provided with and compresses tightly the boss to compress tightly the up end of end cover, compress tightly the boss along the axial top the swivelling joint unit.

Preferably, a threaded connection blind hole is formed in the bottom surface of the mounting groove, and the end portion of the drill rod is mounted in the threaded connection blind hole.

Preferably, the bottom surface of hole sealing apron is along circumference equipartition a plurality of first spring grooves, and is corresponding, the top surface of film baffle is along axial equipartition a plurality of second spring grooves, a plurality of first spring groove with a plurality of second spring groove one-to-one, and every first spring groove and corresponding in the second spring groove respectively with one hold-down spring's both ends adaptation is connected.

Preferably, the primary sleeve further comprises: the guide bolt penetrates through the film partition plate and the compression spring from the bottom surface of the film partition plate in sequence and then is connected to the lower end of the hole sealing cover plate.

Preferably, the lower extreme of the lateral wall of one-level outer tube is provided with first connection boss, the upper end of the inside wall of second grade sheathed tube outer tube is provided with the second connection boss, first connection boss with second connection boss screw thread adaptation is connected.

Preferably, the upper end surface of the inner tube of the secondary sleeve is flush with the bottom surface of the second connecting boss.

Preferably, a third connection boss is arranged at the lower end of the outer side wall of the outer tube of the secondary sleeve, the length of the third connection boss along the axial direction is equal to that of the second connection boss along the axial direction, and the outer surface of the third connection boss is provided with a connection external thread.

The beneficial effects are that:

in the drilling device for advanced drainage of weak rock strata separation water bodies, which is provided by the embodiment of the utility model, the bottom surface of a drill bit is provided with the mounting groove, the mounting groove is internally provided with the rotary connecting unit, in the rotary connecting unit, the outer side wall of the rotary ring is tightly matched with the mounting groove, and the inner side wall of the fixed ring is connected with the outer side wall of the primary outer pipe; because the upper ends of the inner pipe and the first-stage outer pipe in the first-stage casing pipe are coaxially connected to the bottom surface of the hole sealing cover plate, the relative rotation between the drill bit and the first-stage outer pipe is realized, and meanwhile, the drill bit drives the first-stage casing pipe to move forwards along with the drill bit in the drilling process.

In the primary sleeve, a step boss is arranged on the inner side wall of the primary outer tube and/or the outer side wall of the primary inner tube, and a film baffle plate pressed by a pressing spring is arranged on the step boss; meanwhile, a plurality of inner liquid spraying holes positioned above the film partition plate are formed in the primary inner pipe, when the drill bit drills into the water body of the separation layer, if the water body of the separation layer suddenly and largely collapses into the drainage water, the film partition plate moves upwards under the action of the pressure of slurry in the primary sleeve through increasing the grouting pressure of the slurry pump, and then the slurry enters a gap between the primary inner pipe and the drill rod through the inner liquid spraying holes, so that hole sealing treatment is timely carried out.

The outer side wall of the primary outer pipe is provided with an outer liquid spraying hole positioned below the film baffle plate, slurry in the primary sleeve pipe is sprayed into cracks of a water layer of the outer liquid spraying Kong Xiangge to strengthen the water-resisting layer, and if a large amount of water body without a separation layer is crushed into drainage water, the sleeve pipe is unscrewed step by step when drilling is completed, and the drill bit is withdrawn; if a large amount of water is suddenly poured into the water drainage layer, slurry enters a gap between the first-stage inner pipe and the drill rod from the inner liquid spraying hole, hole sealing treatment is timely carried out, the drill bit, the drill rod and the first-stage sleeve are left in the drill hole, and other second-stage sleeves at all stages are gradually withdrawn, so that water damage caused by human being in the water drainage layer is effectively avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. Wherein:

FIG. 1 is a schematic diagram of a drilling apparatus for advanced drainage of weak formation delamination water bodies according to some embodiments of the present utility model;

FIG. 2 is an axial cross-sectional view of the embodiment shown in FIG. 1;

FIG. 3 is a partial view at B in the view shown in FIG. 2;

FIG. 4 is a schematic illustration of a encasement of a primary outer tube and a primary inner tube provided in accordance with some embodiments of the present utility model;

FIG. 5 is a schematic illustration of an assembly of a membrane separator on a plugged cover plate according to some embodiments of the utility model;

fig. 6 is a schematic structural view of a hole sealing cover plate according to some embodiments of the present utility model;

FIG. 7 is a schematic view of a drill bit according to some embodiments of the present utility model;

FIG. 8 is an axial cross-sectional view of a thin film separator provided in accordance with some embodiments of the present utility model;

FIG. 9 is an assembled schematic view of a rotary connection unit provided in accordance with some embodiments of the present utility model;

fig. 10 is an axial cross-sectional view of a secondary cannula provided in accordance with some embodiments of the present utility model.

Reference numerals illustrate:

100. a drill bit; 200. a primary sleeve; 300. a secondary sleeve; 400. a rotary connection unit;

201. a primary outer tube; 202. a primary inner tube; 203. a hole sealing cover plate; 204. a thin film separator; 205. a compression spring; 212. an inner spray orifice;

301. a liquid passing hole;

401. a fixing ring; 402. a rotating ring; 403. and (3) a steel ball.

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the utility model and not limitation of the utility model. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present utility model without departing from the scope or spirit of the utility model. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present utility model encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.

In order to overcome the defect that the water-resisting layer of the soft rock stratum is damaged by advanced drainage of the water body of the separation layer, the utility model releases the solidification liquid with good fluidity and quick solidification time into a drilled hole when drilling to the pre-estimated water-resisting layer through the drilling device for advanced drainage of the water body of the soft rock stratum, so as to fill cracks generated in the water-resisting layer during drilling and strengthen the water-resisting layer in time, thereby effectively preventing the water-resisting layer from being broken caused by drilling and avoiding the water damage of the separation layer caused by people.

As shown in fig. 1 to 10, the drilling device for advanced drainage of weak formation delamination water body comprises: drill bit 100, rotary connection unit 400, primary casing 200, secondary casing 300, and drill pipe. The drill bit 100 and the primary casing 200 are detachably connected through the rotary connection unit 400, the lower end of the primary casing 200 is detachably connected with the secondary casing 300, and the drill rod is detachably connected to the bottom of the drill bit 100 and penetrates through the primary casing 200 and the secondary casing 300.

The driving unit drives the drill rod to rotate, the drill rod drives the drill bit 100 to rotate, and relative rotation is realized between the drill bit 100 and the first-stage sleeve 200 through the rotary connection unit 400, so that the first-stage sleeve 200 and the second-stage sleeve 300 are driven to advance along a drilling hole when the drill rod and the drill bit 100 advance, and when the drilling hole drills to the estimated water-resisting layer, the coagulating liquid with good fluidity and quick coagulating time is released into the drilling hole so as to fill cracks generated in the water-resisting layer during drilling, and the water-resisting layer is reinforced in time.

In the present utility model, an installation groove is provided at the bottom of the drill bit 100, and a rotary connection unit 400 is installed in the installation groove, specifically, the outer diameter of the rotary connection unit 400 is adapted to the radial dimension of the installation groove, so that the rotary connection unit 400 is tightly matched with the installation groove; meanwhile, a compression end cover is detachably connected to the bottom end face of the drill bit 100, specifically, the compression end cover is in fastening connection with the drill bit 100 through fastening bolts (inner hexagonal cylindrical bolts), compression bosses are arranged on the upper end face of the compression end cover, the compression bosses axially push against the rotary connection unit 400, and the rotary connection unit 400 is compressed in the installation groove.

The bottom surface of the installation recess is provided with a threaded connection blind hole for connecting the upper end of the drill rod, so that power transmission is realized between the drill rod and the drill bit 100 through threaded connection. In addition, the drill rod connected with the drill bit 100 can be fixedly connected with the drill bit 100 through other fixed connection modes such as welding, so as to further enhance the connection firmness of the drill rod and the drill bit 100.

In the present utility model, the rotary connection unit 400 includes: a rotating ring 402, a fixed ring 401 and steel balls 403. The two rotating rings 402 are symmetrically arranged on two end faces of the fixed ring 401, rotating sliding grooves are formed in the end faces of the rotating rings 402, which are opposite to the fixed ring 401, and a plurality of steel balls 403 are arranged in the rotating sliding grooves.

The outer side wall of the rotating ring 402 is tightly matched with the mounting groove, and meanwhile, under the action of the pressing end cover, the whole rotating connection unit 400 is pressed and fixed in the mounting groove; the inner side wall of the fixing ring 401 is connected with the primary sleeve 200, specifically, a detachable connection mode such as threaded connection can be adopted, and a fixed connection mode such as welding can also be adopted. Thereby, the relative rotation between the rotary ring 402 and the fixed ring 401 is realized, and meanwhile, the transmission of the axial force between the rotary ring 402 and the fixed ring 401 is realized through the steel balls 403, so that the primary sleeve 200 can move into the borehole along with the drill bit 100 and does not rotate along with the drill bit 100.

In the present utility model, the primary cannula 200 includes: a primary inner pipe 202, a primary outer pipe 201, a hole sealing cover plate 203 and a film baffle 204. Wherein, the first-stage outer tube 201 and the first-stage inner tube 202 are all tubular structures, and the upper ends of the first-stage outer tube 201 and the first-stage inner tube 202 are all detachable and coaxially connected to the bottom surface of the hole sealing cover plate 203, and specifically, are connected to the hole sealing cover plate 203 in a threaded connection manner.

The inner side wall of the primary outer pipe 201 and the outer side wall of the primary inner pipe 202 are respectively provided with a stepped boss, and a thin film baffle 204 is arranged on the stepped bosses during normal drilling. Specifically, a compression spring 205 is arranged between the film separator 204 and the hole sealing cover plate 203, and after the upper ends of the primary outer pipe 201 and the primary inner pipe 202 are screwed on the hole sealing cover plate 203, the film separator 204 is compressed on the step boss under the action of the compression spring 205.

Further, a plurality of first spring grooves are uniformly distributed on the bottom surface of the hole sealing cover plate 203 along the circumferential direction, a plurality of second spring grooves are correspondingly uniformly distributed on the top surface of the film partition plate 204 along the axial direction, the plurality of first spring grooves are in one-to-one correspondence with the plurality of second spring grooves, and each of the first spring grooves and the corresponding second spring grooves is respectively matched with two ends of a compression spring 205. That is, two ends of one compression spring 205 are respectively located in the first spring groove and the second spring groove which are correspondingly arranged, so that the compression force of the compression spring 205 can uniformly act on the film baffle 204, the film baffle 204 is uniformly compressed on the stepped boss, the film baffle 204 is prevented from bearing unbalanced load, and the stability of the film baffle 204 is enhanced.

In a specific example, the guide bolts sequentially penetrate through the membrane partition 204 and the compression springs 205 from the bottom surface of the membrane partition 204 and then are connected to the lower end of the hole sealing cover plate 203. Specifically, a mounting counter bore and a coaxial mounting through hole are axially formed in the bottom surface of the film partition 204, a compression thread blind hole is axially formed in the bottom surface of the hole sealing cover plate 203, the mounting counter bore, the mounting through hole and the compression thread blind hole are coaxial with the corresponding first spring groove and second spring groove, and after the rod portion of the guide bolt passes through the mounting through hole, the guide bolt passes through the compression spring 205 and is in threaded connection with the compression thread blind hole. The adjustment of the pre-compression force of the compression spring on the membrane separator 204 can be achieved by adjusting the guide bolt.

In the utility model, a plurality of outer liquid spraying holes are arranged on the side wall of the primary outer pipe 201, a plurality of inner liquid spraying holes 212 are arranged on the side wall of the primary inner pipe 202, and the outer liquid spraying holes and the inner liquid spraying holes 212 are respectively positioned on two sides of the film partition 204. That is, the outer liquid spray holes on the side wall of the primary outer tube 201 are located below the film partition 204, and the inner liquid spray holes 212 on the side wall of the primary inner tube 202 are located above the film partition 204. When drilling to the estimated water-resisting layer, the coagulating liquid with good fluidity and quick coagulating time is released into the drilled hole through the outer liquid spraying hole so as to fill the cracks generated in the water-resisting layer during drilling and timely strengthen the water-resisting layer; when the drill bit 100 drills into the water body of the separation layer, if a large amount of water is not poured into the water body of the separation layer, the casing pipe is unscrewed step by step when the drilling is completed, and the drill bit 100 is withdrawn; if a large amount of water is suddenly poured into the delamination water body, the grouting pressure of the slurry pump can be increased to enable the film baffle 204 to move upwards, and then the slurry enters the gap between the first-stage inner pipe 202 and the drill pipe through the inner liquid spraying holes 212, so that hole sealing treatment is performed in time.

If a large amount of water is suddenly poured into the delamination water body, the grouting pressure of the slurry pump can be increased, under the pressure of the slurry in the primary sleeve 200, the film baffle 204 moves upwards, and then the slurry enters the gap between the primary inner pipe 202 and the drill rod from the inner liquid spraying hole 212, hole sealing treatment is performed in time, the drill bit 100, the drill rod and the primary sleeve 200 are left in the drill hole, and other secondary sleeves 300 at all levels are gradually withdrawn, so that the delamination water hazard caused by people is effectively avoided.

In the utility model, the secondary sleeve 300 is detachably connected to the lower end of the primary sleeve 200, specifically, the lower end of the outer side wall of the primary outer tube 201 is provided with a first connection boss, the upper end of the inner side wall of the outer tube of the secondary sleeve 300 is provided with a second connection boss, and the first connection boss is in threaded fit connection with the second connection boss. That is, the outer sidewall of the first coupling boss is provided with an external thread, and the inner sidewall of the second coupling boss is provided with an internal thread, and the primary outer tube 201 and the secondary sleeve 300 are coupled together by screw coupling.

Further, the upper end surface of the inner tube of the secondary casing 300 is flush with the bottom surface of the second connection boss, that is, after the first connection boss is screwed to the second connection boss, the lower end surface of the primary inner tube 202 abuts against the upper end surface of the inner tube of the secondary casing 300, so that the slurry flows along the casing by abutting between the lower end surface of the primary inner tube 202 and the upper end surface of the inner tube of the secondary casing 300, that is, the threaded connection between the first connection boss and the second connection boss is limited, and meanwhile, the drill rod and the casing are effectively isolated.

As the drill bit 100 drives the primary casing 200 to move in the borehole, another secondary casing 300 is threaded at the lower end (tail) of the secondary casing 300, and the circulation is performed until the drilling is completed to the target water-resistant layer. The connection between the secondary sleeve 300 is realized through the threaded connection between a second connection boss arranged at the upper end of the secondary sleeve 300 and a third connection boss arranged at the lower end of the outer side wall of the outer tube of the secondary sleeve 300. The length of the third connecting boss along the axial direction is equal to that of the second connecting boss along the axial direction, the outer surface of the third connecting boss is provided with connecting external threads, and the third connecting boss is in threaded connection with the internal threads of the second connecting boss.

The outer pipe side wall of the secondary casing 300 is provided with a plurality of outer spray holes, the bottom end of the secondary casing 300 is provided with a liquid passing hole 301 along the axial direction, and the liquid passing hole 301 is positioned between the outer pipe and the inner pipe of the secondary casing 300, thereby enabling slurry to enter a gap between the outer pipe and the inner pipe of the secondary casing 300 through the liquid passing hole 301 and to be conveyed to the primary casing 200.

In the utility model, the drill bit 100 is used for drilling, and the primary sleeve 200 and the secondary sleeve 300 are driven to move into the drill hole, and slurry is conveyed through the sleeve gap, so that the defect that the conventional dredged water is only drilled and not reinforced is overcome; grouting the soft rock damage gap caused by drilling when drilling to the soft water-resisting layer below the water body of the separation layer through the outer spray holes, and reinforcing the water-resisting layer; if a large amount of water is suddenly poured into the water drainage layer, the grouting pressure of the slurry pump is increased, so that slurry enters a gap between the first-stage inner pipe 202 and the drill pipe from the inner liquid spraying hole 212, and hole sealing treatment is performed in time, thereby effectively preventing the condition that the water quantity exceeds the expected water drainage capacity to cause flooding of the working surface.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (8)

1. Drilling device for advanced drainage of weak rock stratum separation layer water body, which is characterized by comprising: the drill bit, the rotary connecting unit, the primary casing, the secondary casing and the drill rod;

the bottom surface of the drill bit is provided with a mounting groove, and the rotary connecting unit is arranged in the mounting groove;

the rotary connection unit includes: the device comprises two rotating rings, fixing rings and steel balls, wherein the two rotating rings are symmetrically arranged on two sides of the fixing rings respectively, rotating sliding grooves are formed in the end faces of the rotating rings, which are opposite to the fixing rings, and a plurality of steel balls are arranged in the rotating sliding grooves;

the primary sleeve includes: the device comprises a primary inner pipe, a primary outer pipe, a hole sealing cover plate and a film partition plate, wherein the upper ends of the primary inner pipe and the primary outer pipe are detachably and coaxially connected to the bottom surface of the hole sealing cover plate, and stepped bosses are arranged on the inner side wall of the primary outer pipe and/or the outer side wall of the primary inner pipe; the thin film partition plate is positioned on the stepped boss, and a compression spring is arranged between the thin film partition plate and the hole sealing cover plate;

the outer side wall of the rotating ring is tightly matched with the mounting groove, and the inner side wall of the fixing ring is connected with the outer side wall of the primary outer tube; the side wall of the primary outer pipe is provided with a plurality of outer liquid spraying holes, the side wall of the primary inner pipe is provided with a plurality of inner liquid spraying holes, and the outer liquid spraying holes and the inner liquid spraying holes are respectively positioned at two sides of the film partition plate;

the secondary sleeve is detachably connected to the lower end of the primary sleeve, the side wall of the outer tube of the secondary sleeve is provided with a plurality of outer liquid spraying holes, the bottom end of the secondary sleeve is axially provided with a liquid passing hole, and the liquid passing hole is positioned between the outer tube and the inner tube of the secondary sleeve;

the drill rod sequentially passes through the inner pipe of the secondary sleeve and the primary inner pipe and then is connected with the drill bit.

2. The drilling device for advanced drainage of weak strata separation water body according to claim 1, wherein the bottom of the drill bit is detachably connected with a compression end cover, the upper end face of the compression end cover is provided with a compression boss, and the compression boss axially abuts against the rotary connection unit.

3. The drilling device for advanced drainage of a weak strata separation water body according to claim 1, wherein a threaded connection blind hole is formed in the bottom surface of the installation groove, and the end portion of the drill rod is installed in the threaded connection blind hole.

4. The drilling device for advanced drainage of water bodies in weak strata separation layers according to claim 1, wherein a plurality of first spring grooves are uniformly distributed on the bottom surface of the hole sealing cover plate along the circumferential direction, a plurality of second spring grooves are uniformly distributed on the top surface of the film partition plate along the axial direction, the plurality of first spring grooves are in one-to-one correspondence with the plurality of second spring grooves, and each of the first spring grooves and the corresponding second spring grooves are respectively connected with two ends of one compression spring in an adaptive manner.

5. The drilling apparatus for advanced drainage of weak formation separation bodies of water of claim 4, wherein the primary casing further comprises: the guide bolt penetrates through the film partition plate and the compression spring from the bottom surface of the film partition plate in sequence and then is connected to the lower end of the hole sealing cover plate.

6. The drilling device for advanced drainage of weak rock bed water bodies according to claim 1, wherein a first connecting boss is arranged at the lower end of the outer side wall of the primary outer pipe, a second connecting boss is arranged at the upper end of the inner side wall of the outer pipe of the secondary sleeve, and the first connecting boss is in threaded fit connection with the second connecting boss.

7. The drilling device for advanced drainage of weak formation separation water body according to claim 6, wherein the upper end face of the inner tube of the secondary casing is flush with the bottom face of the second connecting boss.

8. The drilling device for advanced drainage of weak rock delamination water body according to claim 6, wherein a third connecting boss is arranged at the lower end of the outer side wall of the outer pipe of the secondary casing, the length of the third connecting boss along the axial direction is equal to the length of the second connecting boss along the axial direction, and the outer surface of the third connecting boss is provided with connecting external threads.