CN211115787U - Borehole wall assembly and borehole wall device - Google Patents

Abstract

The application provides a drilling dado subassembly for use with the drilling tool cooperation. The drilling retaining wall assembly comprises N retaining wall sleeves and N-1 limiting pieces, wherein N is a natural number larger than 1, the inner diameter of the (N-1) th retaining wall sleeve is equal to or larger than the outer diameter of the (N) th retaining wall sleeve, and the (N-1) th retaining wall sleeve comprises a first end and a second end which are oppositely arranged; when the (N-1) th retaining sleeve is sleeved on the (N) th retaining sleeve, the (N-1) th limiting piece is used for limiting the (N) th retaining sleeve to move along the direction from the first end to the second end. The drilling dado subassembly of using this application can effectively maintain the stability of drilling in-process pore wall, makes drilling can not take place bad changes such as undergauge, breakage, fall the piece, collapse, has guaranteed going on smoothly of drilling process. The application also provides a drilling dado device.

Description

Borehole wall assembly and borehole wall device

Technical Field

The application relates to the technical field of drilling, in particular to a drilling dado subassembly and drilling dado device.

Background

With the development of science and technology, soil drilling technology is applied to a plurality of technical fields, and in many technical fields, there is a certain requirement for the depth of soil drilling, for example, in the technology of obtaining a core sample and in the technology of detecting an underground instrument, a deeper drill hole needs to be drilled in soil first.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a drilling dado subassembly and drilling dado device for at the drilling in-process, maintain the stability of pore wall, prevent that drilling from taking place undergauge, breakage, falling the piece, collapsing etc. bad change.

The drilling retaining wall assembly is used in cooperation with a drilling tool and comprises N retaining wall sleeves and N-1 limiting pieces, wherein N is a natural number larger than 1, the inner diameter of the N-1 th retaining wall sleeve is equal to or larger than the outer diameter of the N-1 th retaining wall sleeve, and the N-1 th retaining wall sleeve comprises a first end and a second end which are oppositely arranged;

when the (N-1) th retaining sleeve is sleeved on the (N) th retaining sleeve, the (N-1) th limiting piece is used for limiting the (N) th retaining sleeve to move along the direction from the first end to the second end.

The (N-1) th limiting part comprises a limiting part, and the limiting part is arranged on the inner surface of the (N-1) th retaining sleeve or the outer surface of the (N) th retaining sleeve.

The N-1 th limiting part comprises two limiting parts, and the two limiting parts are respectively arranged on the inner surface of the N-1 th retaining sleeve and the outer surface of the N-1 th retaining sleeve.

Wherein, the spacing portion is an elastic spacing portion.

Wherein the length of the Nth retaining sleeve is greater than the length of the (N-1) th retaining sleeve.

Wherein, the outer surface of each dado sleeve is provided with the external screw thread.

And a lubricating layer is arranged on the outer surface of each wall protection sleeve.

The drilling wall protection assembly further comprises a sleeve frame, the sleeve frame comprises an installation surface, and an accommodating groove is formed in the installation surface and used for accommodating N wall protection sleeves.

The mounting surface is further provided with a through hole penetrating through the sleeve frame, and the inner diameter of the through hole is equal to or larger than the outer diameter of any one of the wall protection sleeves.

The application the drilling dado device, including drilling tool and foretell drilling dado subassembly, the drilling tool is used for drilling, the drilling tool includes drilling rod and drill bit, the drilling dado subassembly is used for protecting the drilling that the drilling tool drilled out.

The mechanical arm is used for placing the Nth wall protection sleeve into the (N-1) th wall protection sleeve.

The drilling device further comprises a fixing piece, wherein the fixing piece is used for fixing the drilling rod and one of the wall protection sleeves relatively.

Wherein, the drilling tool further comprises a rope, and the rope is used for taking the drilling tool out of the wall protection sleeve.

The method for drilling the retaining wall uses the drilling retaining wall device, and comprises the following steps:

forming an N-1 th drilled hole;

placing the (N-1) th retaining sleeve into the (N-1) th drilled hole;

drilling by a drilling tool through the (N-1) th protective wall sleeve to form an Nth drill hole;

and taking the drilling tool out of the wall protection sleeve, and putting the Nth wall protection sleeve into the Nth drilling hole.

Wherein the drill rod is fixed with the (N-1) th retaining sleeve by a fixing member before the drilling tool drills through the (N-1) th retaining sleeve.

And placing the wall protection sleeve into the drilled hole by using a manipulator in the process of placing the wall protection sleeve into the drilled hole.

Wherein the drill is threaded through and withdrawn from the retaining sleeve with a wireline during the threading and withdrawal of the drill through and from the retaining sleeve.

The drilling dado subassembly of using this application can effectively maintain the stability of drilling in-process pore wall, makes drilling can not take place bad changes such as undergauge, breakage, fall the piece, collapse, has guaranteed going on smoothly of drilling process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a borehole retaining wall assembly according to an embodiment of the present application.

FIG. 2 is a cross-sectional schematic view of a retaining sleeve of the borehole wall assembly of FIG. 1.

Fig. 3 is a schematic combined structural diagram of a borehole wall protection assembly according to an embodiment of the present application.

FIG. 4 is a schematic illustration of the construction of the borehole wall assembly of FIG. 3 in another embodiment.

FIG. 5 is a schematic view of a third embodiment of the borehole wall assembly shown in FIG. 3.

FIG. 6 is a top view of a mounting surface of a sleeve mount in a borehole wall assembly according to an embodiment of the present application.

FIG. 7 is a schematic structural diagram of another borehole retaining wall assembly provided by an embodiment of the present application.

FIG. 8 is a schematic structural view of a third borehole retaining wall assembly provided by an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a borehole wall protection device according to an embodiment of the present application.

Fig. 10 is a schematic flow chart of a method for drilling a retaining wall according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 and 2 together, fig. 1 is a schematic structural diagram of a borehole wall protection assembly 100 according to an embodiment of the present application. FIG. 2 is a cross-sectional schematic view of the retaining sleeve 10 of the borehole wall assembly 100 of FIG. 1.

The borehole retaining wall assembly 100 of the present embodiment is configured for use with a drilling tool during a drilling process, including, but not limited to, surface, wall, deep sea, or lunar surface drilling.

The borehole retaining assembly 100 includes N retaining sleeves 10 and N-1 limiters 20, N being a natural number greater than 1. The inside diameter of the (N-1) th retaining sleeve 10 is equal to or greater than the outside diameter of the (N) th retaining sleeve 10. The nth-1 dado sleeve 10 includes oppositely disposed first and second ends 101 and 102. When the N-1 th retaining sleeve 10 is sleeved on the N-1 th retaining sleeve 10, the N-1 th limiting member 20 is used to limit the N-1 th retaining sleeve 10 to move along the first end 101 to the second end 102. Wherein the first end 101 faces the ground surface and the second end 102 faces the subsurface during use of the borehole retaining wall assembly 100.

The drilling dado subassembly 100 that uses this application embodiment to provide can effectively maintain the stability of drilling in-process pore wall, makes drilling can not take place bad changes such as undergauge, breakage, fall piece, collapse, has guaranteed going on smoothly of drilling process.

The drilling dado assembly 100 provided in this embodiment is described in detail by taking N ═ 3 as an example, it can be understood that N may be any natural number greater than 1, and for the case where N is other number, reference may be made to the contents of the embodiment where N is 3, and further description is not repeated here.

When N-3, the drill retaining wall assembly 100 includes three retaining sleeves 10 and two retaining members 20. In this embodiment, each retaining sleeve 10 is cylindrical. In particular, the outer surface of the retaining sleeve 10 is provided with an external thread 30. In the process of drilling and protecting the wall, due to the existence of the external thread 30 on the outer surface of the wall protecting sleeve 10, the wall protecting sleeve 10 is more easily screwed into the dug drill hole, and after the wall protecting sleeve 10 is fixed in the corresponding drill hole, due to the existence of the external thread 30, the friction force between the outer surface of the wall protecting sleeve 10 and the drill hole is increased, so that the wall protecting sleeve 10 cannot be separated from the drill hole or outwardly displaced from the drill hole due to vibration or other reasons, thereby causing process defects. Further, the inner surface of the retaining sleeve 10 is provided with a lubricating layer 40. When the N retaining sleeves 10 are sleeved together, the friction between every two retaining sleeves 10 is reduced due to the existence of the lubricating layer 40, and the N retaining sleeves 10 are more easily sleeved together, that is, the N-th retaining sleeve 10 is more easily sleeved on the N-1-th retaining sleeve 10.

Referring to fig. 3, fig. 3 is a schematic view of an assembly structure of a borehole wall protection assembly 100 according to an embodiment of the present disclosure.

The three retaining sleeves 10 are a first retaining sleeve 11, a second retaining sleeve 12 and a third retaining sleeve 13, respectively. The inner diameter of the first retaining sleeve 11 is equal to the outer diameter of the second retaining sleeve 12, and the inner diameter of the second retaining sleeve 12 is equal to the outer diameter of the third retaining sleeve 13. Namely, the first retaining sleeve 11 can be sleeved on the second retaining sleeve 12, and the inner surface of the first retaining sleeve 11 is attached to the outer surface of the second retaining sleeve 12. Meanwhile, the second retaining wall sleeve 12 can be just sleeved on the third retaining wall sleeve 13, and the inner surface of the second retaining wall sleeve 12 is attached to the outer surface of the third retaining wall sleeve 13. That is, the first retaining sleeve 11, the second retaining sleeve 12 and the third retaining sleeve 13 can be sequentially sleeved together from outside to inside, and between adjacent retaining sleeves 10, the outer surface of the inner retaining sleeve 10 is partially attached to the inner surface of the outer retaining sleeve 10.

In one embodiment, the two limiting members 20 are a first limiting member 21 and a second limiting member 22. Each of the position-limiting members 20 includes a position-limiting portion, that is, the first position-limiting member 21 includes a first position-limiting portion 211, and the second position-limiting member 22 includes a second position-limiting portion 221. The first stopper 211 is disposed on the inner surface of the first retaining sleeve 11, and the second stopper 221 is disposed on the inner surface of the second retaining sleeve 12.

It will be appreciated that the first retaining member 21 serves to limit movement of the second retaining sleeve 12 in the direction from the first end 101 to the second end 102, and the second retaining member 22 serves to limit movement of the third retaining sleeve 13 in the direction from the first end 101 to the second end 102. Specifically, when the first retaining sleeve 11 is installed under the ground, the second retaining sleeve 12 is moved downward from the inside of the first retaining sleeve 11 along the first end 101 toward the second end 102, the first limiting member 21 is in a passing state, the second retaining sleeve 12 can be smoothly placed in the second bore, and after the second retaining sleeve 12 is attached to the second bore, the first limiting member 21 is in a non-passing state along the second end 102 toward the first end 101, and the first limiting member 21 limits the second retaining sleeve 12 from moving along the second end 102 toward the first end 101. The action mechanism of the second limiting member 22 is substantially the same as that of the first limiting member 21, and will not be described herein.

The existence of the limiting member 20 prevents the retaining sleeve 10 located at the inner side from being separated from the retaining sleeve 10 located at the outer side due to vibration or other reasons, thereby causing process defects, and the bottom of the retaining sleeve 10 can be always attached to the bottom of the corresponding drilling hole, thereby causing no adverse effect on the drilling process.

Referring to fig. 4, fig. 4 is a schematic diagram of the borehole wall assembly 100 of fig. 3 in another embodiment.

The difference between the borehole wall protection assembly 100 of this embodiment and the borehole wall protection assembly 100 of the previous embodiment is that the stopper is provided on the outer surface of the wall protection sleeve 10, i.e., the first stopper 211 is provided on the outer surface of the second wall protection sleeve 12, and the second stopper 221 is provided on the outer surface of the third wall protection sleeve 13. The presence of the stop 20 limits the movement of the retaining sleeve 10, making the connection between the retaining sleeves 10 more stable.

Referring to fig. 5, fig. 5 is a schematic diagram of the borehole wall assembly 100 of fig. 3 in a third embodiment.

The drill retaining wall assembly 100 of this embodiment differs from the drill retaining wall assemblies 100 of the two embodiments described above in that each of the limiting members 20 includes two limiting portions. Specifically, the first limiting member 21 includes a first limiting portion 211 and a third limiting portion 212, the first limiting portion 211 is disposed on an inner surface of the first retaining sleeve 11, and the third limiting portion 212 is disposed on an outer surface of the second retaining sleeve 12. The second position-limiting member 22 includes a second position-limiting portion 221 and a fourth position-limiting portion 222, the second position-limiting portion 221 is disposed on the inner surface of the second retaining sleeve 12, and the fourth position-limiting portion is disposed on the outer surface of the third retaining sleeve 13. Each limiting member 20 has two limiting portions, so that the inner surface and the outer surface of each retaining wall sleeve 10 are provided with the limiting portions, and the two limiting portions limit the connection between each retaining wall sleeve 10 and the adjacent retaining wall sleeve 20 more stably.

The limiting member 20 may be a buckle limiting member 20, a bolt limiting member 20, a spring limiting member 20, or other types of limiting members 20, in this embodiment, the limiting member 20 is made of an elastic material, and the structure of the limiting member 20 is an annular three-dimensional structure with a triangular cross section.

The drilling retaining wall assembly 100 provided by the embodiment can be sleeved together with a plurality of drilling retaining walls, and the retaining sleeve 10 is limited by the limiting part 20 to move only in a specified direction, so that when the plurality of retaining sleeves 10 are assembled together, the stability of the assembly structure is stronger, and when the device assembled by using the drilling retaining wall assembly 100 provided by the embodiment is used for drilling retaining walls, the stability of the hole wall of a drill hole can be better maintained, so that the situations of hole shrinkage, crushing, block falling, collapse and the like of the drill hole can be avoided.

Referring to fig. 6, fig. 6 is a top view of a mounting surface 51 of a sleeve holder 50 of a borehole wall assembly according to an embodiment of the present disclosure.

In this embodiment, the borehole wall sleeve 100 further includes a sleeve mount 50. The retaining wall sleeve is fixed through the sleeve frame 50, the sleeve frame 50 comprises a mounting surface 51, a plurality of regularly-arranged accommodating grooves 52 are formed in the mounting surface 51, the accommodating grooves 52 are used for accommodating the retaining wall sleeve, it can be understood that a plurality of retaining wall sleeves can be arranged in each accommodating groove 52 according to conditions, meanwhile, the sizes of the accommodating grooves 52 can be different from each other, and each accommodating groove 52 is used for accommodating one corresponding retaining wall sleeve, namely, the size of each accommodating groove 52 is matched with the size of the corresponding retaining wall sleeve.

The sleeve frame 50 is used for vertically fixing the retaining sleeve in various complex environments, so that the retaining sleeve is convenient to take and place, and when only one corresponding retaining sleeve is placed in each accommodating groove 52, the positions of the retaining sleeves 10 with different inner diameters can be quickly positioned through regular arrangement of the accommodating grooves 52.

It should be noted that, a through hole 53 penetrating through the mounting surface 51 is further provided at a middle position of the mounting surface 51, that is, at a middle position of the plurality of regularly arranged receiving grooves 52, a radius of the through hole 53 is larger than a radius of the dug hole, and the retaining wall sleeve can be placed into the corresponding hole after passing through the through hole 53.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another borehole wall protection assembly 100 according to an embodiment of the present application.

The drill retaining assembly 100 of the embodiment of the present application differs from the drill retaining assembly 100 of the previous embodiment in that the length of the nth retaining sleeve 10 is greater than the length of the (N-1) th retaining sleeve 10, also exemplified by N ═ 3, i.e., the length of the first retaining sleeve 11 is greater than the length of the second retaining sleeve 12, and the length of the second retaining sleeve 12 is greater than the length of the third retaining sleeve 13.

When the three retaining sleeves 10 are put together, the first ends of the three retaining sleeves 10 are in the same horizontal plane, and the second end of the inner retaining sleeve 10 extends from the second end of the outer retaining sleeve 10, i.e. the second end of the second retaining sleeve 12 extends from the second end of the first retaining sleeve 11, and the second end of the third retaining sleeve 13 extends from the second end of the second retaining sleeve 12. When the device assembled by the drilling dado assembly 100 provided by the embodiment is used for drilling dado, the first dado sleeve 11 dado is used for dado of a first drilling; a second retaining sleeve 12 is located in the upper half of the interior of the first retaining sleeve 11 and retains the first borehole, the second retaining sleeve 12 extending from the second end of the first retaining sleeve 11 in the lower half thereof to retain the second borehole; a third retaining sleeve 13 is located in the upper half of the first retaining sleeve 11 and simultaneously protects the first borehole, a third retaining sleeve 13 is located in the middle of the second retaining sleeve 12 and simultaneously protects the second borehole, and a third retaining sleeve 13 extends from the lower half of the second retaining sleeve 12 and simultaneously protects the third borehole. Because above-mentioned structure, at the in-process of drilling dado, there is a plurality of dado sleeves 10 to the condition of carrying out common dado to same drilling, and along the second end to the first end direction of first dado sleeve 11, the number of piles that overlaps of a plurality of dado sleeves 10 increases gradually, be close to the drilling mouth promptly, the number of piles that dado sleeve 10 overlaps is more, the stability of dado device has been increased, there is better effect to the pore wall stability that maintains drilling, be difficult to take place drilling undergauge, breakage, fall the piece, collapse scheduling problem.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a third drilling dado assembly 100 according to an embodiment of the present disclosure.

The difference between the borehole wall assembly 100 of the embodiment of the present application and the borehole wall assembly 100 of the embodiment described above is that the inside diameter of the N-1 th wall casing 10 is larger than the outside diameter of the N-th wall casing 10, and similarly, N ═ 3 is taken as an example, that is, the inside diameter of the first wall casing 11 is larger than the outside diameter of the second wall casing 12, the inside diameter of the second wall casing is larger than the outside diameter of the third wall casing 13, and when the wall casings 10 are sleeved, a gap exists between the adjacent wall casings 10.

When the device composed of the drilling dado assembly 100 provided by the embodiment is used for drilling dado, only the size of a drill hole is matched with the size of the corresponding dado sleeve 10, and the gap between the dado sleeves 10 which are sleeved together cannot generate adverse effects. When the first retaining sleeve 11 of the borehole retaining assembly 100 of the present embodiment has the same shape and size as the first retaining sleeve 11 of the borehole retaining assembly 100 of the first embodiment, it can be easily understood that the second retaining sleeve 12 and the third retaining sleeve 13 of the borehole retaining assembly 100 of the present embodiment are further reduced in size compared to the second retaining sleeve 12 and the third retaining sleeve 13 of the borehole retaining assembly 100 of the first embodiment, thereby reducing the production cost.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a borehole wall protection device 200 according to an embodiment of the present application.

The drilling technology that this application embodiment relates to can be used to a plurality of fields such as the acquisition of core sample, underground instrument surveys, the acquisition of the inside resource of moon, and this application embodiment provides a drilling dado device 200, can be used to the acquisition of core sample.

The drilling dado device 200 provided by the embodiment includes the drilling dado assembly 100 and the drilling tool 60 provided by any of the above embodiments, the drilling tool 60 includes the drill rod 61 and the drill bit 62, wherein, the drill bit 62 is further provided with a coring device, while the drill bit 62 is used for drilling, the coring device provided thereon can collect cores, the drill rod 61 is used for connecting the drill bit 62, when the drilling dado device 200 provided by the embodiment of the application is used for drilling the drilling dado, the drilling tool 60 is used for drilling, the hole drilled by the drilling dado assembly 100 is protected, the stability of the hole wall is maintained, and the whole drilling dado device 200 can effectively complete the drilling dado process.

Wherein the drill 60 in the borehole wall protecting apparatus 200 is used to perform a drilling operation to drill a plurality of boreholes which are distributed in an overlapping manner in a vertically downward direction of the earth's surface, and the radius of the plurality of boreholes gradually decreases in the downward direction of the earth's surface. A plurality of retaining sleeves 10 in the drilling retaining wall assembly 100 are respectively placed in a plurality of drill holes matched with the size of the plurality of retaining sleeves, and a plurality of limiting parts 20 in the drilling retaining wall assembly 100 limit the connection and fixation among the plurality of retaining sleeves 10, so that the structure among the plurality of retaining sleeves 10 is more stable, and a better retaining effect is achieved.

The borehole wall protection apparatus 200 further comprises a manipulator 70, wherein the manipulator 70 is configured to place the nth wall protection sleeve 10 into the corresponding borehole through the (N-1) th wall protection sleeve 10, that is, to place the second wall protection sleeve 12 into the second borehole through the first wall protection sleeve 11, and to place the third wall protection sleeve 13 into the third borehole through the second wall protection sleeve 12. The manipulator 70 can be used by the operator to remotely control the wall-protecting tool, so that the necessary wall-protecting drilling process can be completed without field operation of the operator in any severe environment, and the influence of the severe environment can be effectively overcome.

The borehole wall guard 200 further comprises a fastener 80, the fastener 80 being adapted to secure the drill rod 61 to one of the wall sleeves 10, the fastener 80 being of a manually operable configuration to contract or expand. Specifically, when the drill rod 61 needs to be fixed with one of the retaining sleeves 10, the fixing member 80 located between the drill rod 61 and the retaining sleeve 10 is expanded, so that the fixing member 80 is respectively contacted with the inner surfaces of the drill rod 61 and the retaining sleeve 10, the friction force between the fixing member 80 and the drill rod 61 and the retaining sleeve 10 is increased, and the drill rod 61 and the retaining sleeve 10 are indirectly prevented from relative movement, namely the drill rod 61 and the retaining sleeve 10 are fixed. The existence of the fixing piece 80 ensures that the drill rod 61 can not move relative to the wall protection sleeve 10 in the drilling process, vertical drilling is always carried out, and the stability of drilling is improved. When it is desired to remove the drill rod 61 from the retaining sleeve 10, the fastener 80 is simply retracted, reducing the friction between the fastener 80 and the drill rod 61 and the retaining sleeve 10, so that the drill rod 61 can be removed.

It should be noted that no lubricating layer is provided at the inner surface of the retaining sleeve 10 that is in contact with the fixing member 80, so that the frictional force between the fixing member 80 and the corresponding retaining sleeve 10 is ensured.

The borehole wall guard 200 further comprises a cable 90, which cable 90 is used to remove said drilling tool 60 from the wall guard sleeve 10.

When the drilling retaining wall device 200 of the present embodiment is used for drilling retaining wall, wherein the drilling tool 60 drills a hole wall, the drilling retaining wall assembly 100 is used to maintain the stability of the drilled hole, and the drilling retaining wall device 200 formed by the two effectively completes the whole drilling retaining wall process.

Referring to fig. 10, fig. 10 is a schematic flow chart illustrating a method for drilling a retaining wall according to an embodiment of the present disclosure.

The method for drilling the protective wall, which is disclosed by the embodiment of the application, uses the drilling protective wall device disclosed by the embodiment of the application, and comprises the following steps of:

forming an N-1 th drilled hole;

putting the (N-1) th wall protection sleeve 10 into the (N-1) th drilled hole;

the drilling tool 60 drills through the (N-1) th retaining sleeve 10 to form an Nth drilled hole;

the drilling tool 60 is removed from the nth-1 retaining sleeve 10 and the nth retaining sleeve 10 is placed in the nth borehole.

When the method for drilling the retaining wall is used for drilling the retaining wall, the retaining wall is circularly performed by the combined structure of the plurality of retaining walls and sleeves, so that the stability of the hole wall in the drilling process can be effectively maintained, the drilling cannot be subjected to undesirable changes such as diameter shrinkage, crushing, block falling and collapse, and the smooth drilling process is ensured.

Specifically, taking N as an example of 3, when the borehole wall protection device 200 provided in the embodiment of the present application is used for borehole wall protection, the borehole wall protection method includes:

in step S1, the target area is excavated to form a first bore hole having a depth matching the depth of the first retaining sleeve 11.

In step S2, the first retaining sleeve 11 is placed in the first borehole. Specifically, the outer surface of the first retaining wall sleeve 11 is attached to the inner wall of the first borehole, the bottom of the first retaining wall sleeve 11 and the bottom of the first borehole are located on the same horizontal plane, and the top of the first retaining wall sleeve 11 and the ground surface are located on the same horizontal plane.

Step S3, the drill 60 is passed through the first retaining sleeve 11 to drill a space below the first retaining sleeve 11 to form a second bore hole with a size and length matching the second retaining sleeve 12.

In step S4, the drill 60 is removed from the first retaining sleeve 11 and a second retaining sleeve 12 is placed in the second borehole. Specifically, the outer surface of the second retaining sleeve 12 is attached to the inner wall of the second borehole, the bottom of the second retaining sleeve 12 is at the same level as the bottom of the second borehole, and the top of the second retaining sleeve 12 is at the same level as the top of the second borehole.

Step S5, the drill 60 is passed through the second retaining sleeve 12 to drill a lower space in the area enclosed by the second retaining sleeve 12, so as to form a third drill hole with a size and a length matched with the third retaining sleeve 13.

Step S6, remove the drill 60 from the second retaining sleeve 12 and place the third retaining sleeve 13 in the third borehole. Specifically, the outer surface of the third retaining wall sleeve 13 is attached to the inner wall of the third borehole, the bottom of the third retaining wall sleeve 13 and the bottom of the third borehole are located on the same horizontal plane, and the top of the third retaining wall sleeve 13 and the top of the third borehole are located on the same horizontal plane.

It is understood that N may be any natural number greater than 1, and for the case that N is other values, referring to the content of the embodiment where N is 3, the drilling-casing-releasing process may be performed in the same manner, until the drilled hole reaches the required depth, the drilling process may be stopped, which is not further described herein.

In step S3, before the drilling tool 60 drills a hole, the drill rod 61 may be fixed to the inner surface of the first retaining sleeve 11 by the fixing member 80, so that the upper portion of the drill rod 61 is kept stable during the drilling process of the drilling tool 60, and a vertical drilling is performed, so that the drilled hole has a more regular shape and a more stable structure.

Similarly, in step S5, the drill rod 61 may be fixed to the inner surface of the second casing 12 by the fixing member 80 for vertical drilling.

It is understood that in steps S2, S4, S6, the taking, moving and placing of the retaining wall sleeve 10 may be achieved by the robot 70. When the moon bed surface drilling and the deep sea drilling are carried out, manual operation is adopted

The placement of the retaining wall sleeve 10 has great difficulty and high risk, for example, when drilling on the surface of the moon bed, firstly, technical obstacles need to be overcome to convey personnel to the surface of the moon, and meanwhile, special environmental conditions such as ultrahigh vacuum, microgravity, extreme temperature difference, high cosmic radiation and the like on the surface of the moon bed need to be overcome; when deep sea drilling is carried out, huge pressure on the seabed needs to be overcome. The placement of the retaining sleeve 10 is now a necessary option using robotic 70 automation.

In the process of passing the drill 60 through the retaining wall sleeve 10 and taking the drill 60 out of the retaining wall sleeve 10, the drill 60 may be pulled, moved and placed by the rope 90 in steps S3, S4, S5 and S6, so that the operation is more convenient.

When the drilling and wall protecting method provided by the embodiment is used for drilling and wall protecting, the external wall protecting sleeve 10 is firstly placed into the dug drill hole matched with the external wall protecting sleeve in size and length, then the space below the region surrounded by the external wall protecting sleeve 10 is drilled to form the drill hole matched with the adjacent internal wall protecting sleeve 10 in size and length, so that the adjacent internal wall protecting sleeve 10 is placed into the drill hole, meanwhile, the adjacent wall protecting sleeves 10 are fastened and connected together through the limiting part 20, the drilling and sleeve placing process is circularly carried out in the same mode, and the drilling process can be stopped until the drilled drill hole reaches the required depth. The operation is simple, convenient and feasible, deeper drilling requirements can be realized by circularly performing the processes of drilling and sleeve placing, and the function of drilling and wall protection can be effectively realized by the existence of the plurality of wall protection sleeves 10.

Claims (13)

1. A drilling retaining wall assembly is used in cooperation with a drilling tool and is characterized by comprising N retaining wall sleeves and N-1 limiting pieces, wherein N is a natural number larger than 1, the inner diameter of the N-1 th retaining wall sleeve is equal to or larger than the outer diameter of the N retaining wall sleeve, and the N-1 th retaining wall sleeve comprises a first end and a second end which are oppositely arranged;

when the (N-1) th retaining sleeve is sleeved on the (N) th retaining sleeve, the (N-1) th limiting piece is used for limiting the (N) th retaining sleeve to move along the direction from the first end to the second end.

2. The borehole wall assembly of claim 1, wherein the (N-1) th retaining member comprises a retaining portion disposed on an inner surface of the (N-1) th wall sleeve or an outer surface of the (N) th wall sleeve.

3. The borehole wall assembly of claim 1, wherein the (N-1) th retaining member comprises two retaining portions disposed on an inner surface of the (N-1) th wall bushing and an outer surface of the (N) th wall bushing, respectively.

4. The borehole wall assembly according to claim 2 or 3, wherein the stop is a resilient stop.

5. The borehole wall assembly of claim 1, wherein the nth wall guard sleeve has a length greater than a length of the N-1 th wall guard sleeve.

6. The borehole wall assembly of claim 1, wherein an outer surface of each of the wall sleeves is externally threaded.

7. The borehole wall assembly of claim 1, wherein an outer surface of each of the wall sleeves is provided with a lubricating layer.

8. The borehole wall assembly of claim 1, further comprising a sleeve holder, the sleeve holder including a mounting surface, the mounting surface defining a receiving slot for receiving N of the wall sleeves.

9. The borehole retaining wall assembly of claim 8, further comprising a through bore extending through the sleeve mount, the through bore having an inner diameter equal to or greater than an outer diameter of any of the retaining sleeves.

10. A borehole retaining apparatus comprising a drilling tool for drilling a borehole, the drilling tool comprising a drill stem and a drill bit, and a borehole retaining assembly according to any of claims 1 to 9 for protecting a borehole drilled by the drilling tool.

11. The borehole wall guard of claim 10, further comprising a manipulator to place the nth wall guard sleeve into the N-1 th wall guard sleeve.

12. A borehole wall guard according to claim 10 further comprising a fastener for securing the drill rod relative to one of the wall guards.

13. The borehole wall guard of claim 10, further comprising a cable for removing the drill from the wall guard sleeve.

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