A full-protected shoe follow-up drill device

Abstract

This invention discloses a full-casing follow-up drill bit device, relating to the field of follow-up drill bit devices and an anti-collapse hole mechanism. The device is located in the middle of the inner side of a base and includes a worm gear. A housing is rotatably connected to the surface of the worm gear. A drive motor is fixedly connected to the top of the base near the housing. A worm is fixedly connected to the output end of the drive motor. An internal thread is provided on the inner side of the worm gear, and a helical assembly is connected to the worm gear via the internal thread. In this full-casing follow-up drill bit device, the worm gear utilizes the lifting characteristics of the thread to cause the helical assembly to rotate downwards. The drilling assembly drills into the stratum to form a hole, which is annular. A drag-reducing mechanism then removes the soil inside the annular hole, replacing the direct forming of the drill hole in existing technologies. This effectively reduces disturbance to the stratum and solves the problem of the drill bit causing the rotation of boulders in the backfill soil, resulting in significant hole collapse.

Description

Technical Field

[0001] This invention relates to the field of follow-up drill bit devices, specifically a full casing follow-up drill bit device. Background Technology

[0002] Rotary drilling rigs can be used to test drill piles in the site. During the rotary drilling process, the drill bit drives the boulders in the backfill to rotate, causing a large number of holes to collapse. Continue drilling until the hole is about 4 meters deep. The surrounding boulders collapse into the hole. There is a thick layer of plain fill in the site. The plain fill is mainly composed of broken stones. There are many gaps in the layer. During the rotary drilling process, the drill bit drives the boulders in the backfill to rotate, causing a large number of holes to collapse. The construction of existing pile foundation projects faces three major challenges, among which the collapse problem is one of the most difficult to solve. Currently, there are two traditional methods to prevent collapse: one is mud slurry wall protection, which uses special wall protection materials mixed in a certain proportion and poured into the foundation pile hole. During drilling, the drill bit throws the mud slurry onto the hole wall to prevent collapse. This method is inexpensive, but it is not suitable for quicksand and large-scale collapses. The other method is to use casing, but the efficiency of casing installation is very low and requires special tools, such as pipe rolling machines. These pipe rolling machines are expensive and extremely inefficient. Due to the friction of the entire inner wall of the hole, it is difficult to install the casing. When pulling out the casing, the weight of the casing itself must also be taken into account, making the extraction even more difficult. Moreover, a project often requires more than one type of pile diameter and more than one type of casing, resulting in poor versatility and extremely high costs.

[0003] Existing full-casing follow-up drill bit devices have structural design flaws that cause problems such as the drill bit rotating boulders in the backfill soil, resulting in a large number of hole collapses, and the friction of the entire inner wall of the borehole making it difficult to pull out the casing. Summary of the Invention

[0004] This invention provides a full casing follow-up drill bit device, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a full-casing follow-up drill bit device, comprising...

[0006] A base, the bottom of which is fixedly connected to an extension rod, and the end of the extension rod away from the base is fixedly connected to a concrete platform;

[0007] An anti-collapse hole mechanism is located in the middle of the inner side of the base; it includes a worm gear, the surface of which is rotatably connected to a housing, a drive motor is fixedly connected to the top of the base near the housing, a worm is fixedly connected to the output end of the drive motor, the inner side of the worm gear is provided with an internal thread, a helical assembly is connected to the worm gear through the internal thread, and a drilling assembly is fixedly connected to the bottom end of the helical assembly. The rotation of the worm gear drives the helical assembly to rotate and move downward, and the drilling assembly drills into the interior of the stratum to form a drill hole;

[0008] The drag reduction mechanism is located above the base. The drilling component drills into the formation to form a cylindrical hole. The drag reduction mechanism rotates downward to the inside of the spiral component, lifting the soil inside the spiral component out of the formation, thereby forming a complete drill hole.

[0009] Preferably, the bottom of the base is in direct contact with the ground, and the concrete platform extends into the ground. The anti-collapse hole mechanism is screwed into the ground to drill a hole on the surface. The bottom of the shell is fixedly connected to the top of the base near the middle. The spiral assembly replaces the existing casing to support the drilled hole and prevent collapse. The bottom end of the extension rod extends to a position below the ground. The concrete platform makes the base closely attached to the ground, driving the motor to drive the worm to rotate. The surface of the worm meshes with the surface of the worm wheel, causing the worm wheel to rotate on the inner side of the shell.

[0010] Preferably, the spiral assembly includes a cylinder, the surface of which is provided with a threaded groove, and the surface of the threaded groove is connected to the inner side of the worm gear by a thread.

[0011] Preferably, the cylinder has a flow guide layer inside, and the surface of the cylinder has flow guide holes that communicate with the flow guide layer. The flow guide holes are located below the surface of the cylinder, and the cylinder is located below the formation. After the complete drilling hole is formed, concrete slurry is injected into the inside of the cylinder. The slurry penetrates into the gap between the threaded groove and the formation through the flow guide holes.

[0012] Preferably, the drilling assembly includes a drilling cylinder, the top of which is fixedly connected to the bottom of the cylinder body. The inner side of the drilling cylinder is provided with a cavity. The inner side of the worm gear is connected to the surface of the thread groove through a thread. When the worm gear is driven to rotate by the worm, the cylinder body is driven to rotate downwards by the thread groove. The bottom of the drill block is screwed into the formation. The protrusion of the drill block makes it easier for the ground to be squeezed into a hole, so that the formation forms an annular drilling hole.

[0013] Preferably, a cutter plate is fixedly connected to the inner side of the drilling cylinder, the cutter plate penetrates the cavity of the drilling cylinder, and a drilling block is fixedly connected to the bottom of the drilling cylinder, the bottom of the drilling block is provided with a protrusion.

[0014] Preferably, the drag reduction mechanism includes a first motor, the bottom of the first motor is fixedly connected to the top of the base near the edge, the output shaft of the first motor is fixedly connected to a lead screw, and a lifting platform is threadedly connected to the upper part of the surface of the lead screw.

[0015] Preferably, a sliding rod is slidably connected to the inner side of the lifting platform, the bottom end of the sliding rod is fixedly connected to the top of the base, a temperature control component is fixedly connected to the top of the lifting platform, and a soil lifting component is fixedly connected to the inner side of the temperature control component. When the worm gear is driven to rotate by the worm, the spiral component rotates downward into the interior of the stratum, and the drilling component rotates to drill into the stratum and form an annular drilling hole. After the drilling hole is formed, the spiral component supports the drilling hole to prevent it from collapsing.

[0016] Preferably, the temperature control component includes a temperature control wall, the bottom of which is fixedly connected to the middle of the top of the lifting platform, and an air guide pipe is fixedly connected to the upper part of the surface of the temperature control wall.

[0017] Preferably, a second motor is fixedly connected to the bottom of the inner side of the temperature control wall, the second motor being a hollow type motor, and a sealing cover is fixedly connected to the top of the temperature control wall.

[0018] Preferably, the soil lifting assembly includes a rotating tube, the upper part of the rotating tube is fixedly connected to the inner side of the second motor, and the top end of the rotating tube extends to the upper part of the inner side of the temperature control wall. After the annular drilling hole is formed, the inner diameter of the drilling hole and the inner diameter of the spiral assembly are both larger than the inner and outer diameters of the spiral assembly. At this time, the spiral assembly provides support inside the drilling hole to prevent the hole from collapsing.

[0019] Preferably, the bottom end of the rotating tube is provided with a tapered tip, an air guide hole is opened at the lower position of the surface of the rotating tube, and a spiral blade is fixedly connected to the surface of the rotating tube, with the bottom end of the spiral blade extending to the tapered tip.

[0020] This invention provides a full casing follow-up drill bit device. It has the following beneficial effects:

[0021] 1. This full casing follow-up drill bit device uses the lifting characteristics of the threaded screw to make the spiral assembly rotate downwards. The drilling assembly drills into the interior of the formation to form a drill hole. This drill hole is annular. Then, the drag reduction mechanism is used to remove the soil inside the annular hole. This replaces the direct forming of the drill hole in the existing technology, which can effectively reduce the disturbance to the formation and solve the problem of the drill bit driving the rotation of boulders in the backfill soil, causing a large number of hole collapses.

[0022] 2. The full casing follow-up drill bit device has the drill block screwed into the interior of the formation. One side of the cutter plate extends to the outside of the drill casing, and the other side of the cutter plate extends to the inside of the drill casing. This makes the outside and inside of the drill hole slightly larger than the inner and outer diameters of the casing. When it is necessary to screw the casing out of the formation, the gap formed by the inner and outer sides can effectively reduce the resistance of the formation to the casing.

[0023] 3. In this full casing follow-up drill bit device, the first motor drives the lead screw to rotate, and the inner side of the lifting platform slides downward on the surface of the slide rod. The temperature control component drives the soil lifting component to rotate, and the soil lifting component is screwed into the soil layer on the inner side of the spiral component. When the soil lifting component is completely screwed into the soil layer, the first motor reverses to make the lifting platform move upward, and the soil inside the spiral component is lifted out. There is a gap between the spiral component and the stratum, which solves the problem of difficulty in pulling out the casing caused by the friction of the entire inner wall of the borehole diameter.

[0024] 4. In this full casing follow-up drill bit device, when the lifting platform is driven to move downward, the second motor drives the rotating tube to rotate, so that the spiral blades are screwed into the inner side of the spiral assembly. The soil on the inner side of the spiral assembly is screwed out in a spiral shape. When the bottom end of the spiral blades reaches the bottom of the spiral assembly, the lifting platform moves upward, so that the soil is driven out of the formation by the spiral blades, cleaning the soil on the surface of the spiral blades, and forming a complete drill hole.

[0025] 5. In this full casing follow-up drill bit device, the lifting platform drives the rotating tube to rotate into the inside of the casing. Cooling gas is introduced into the inside of the air guide pipe. The cooling gas diffuses on the inner side of the casing through the air guide hole, which cools the casing and slows down the solidification speed of the mud near the casing. The worm is driven to move in the opposite direction, which makes the casing rotate out of the formation. The concrete mud solidifies in the gap to form a solid support layer, thus making the anti-collapse hole effect of the device better. Attached Figure Description

[0026] Figure 1 This is a perspective view of the top of the entire casing-following drill bit device of the present invention;

[0027] Figure 2 This is a perspective view of the bottom of the entire casing-following drill bit device of the present invention;

[0028] Figure 3 This is a schematic diagram of the anti-collapse hole mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the spiral assembly of the present invention;

[0030] Figure 5 This is a schematic diagram of the drilling assembly of the present invention;

[0031] Figure 6 This is a schematic diagram of the drag reduction mechanism of the present invention;

[0032] Figure 7 This is a schematic diagram of the temperature control component of the present invention;

[0033] Figure 8 This is a schematic diagram of the soil lifting component of the present invention.

[0034] In the diagram: 1. Base; 2. Extension rod; 3. Concrete platform; 4. Anti-collapse hole mechanism; 41. Shell; 42. Drive motor; 43. Worm gear; 44. Worm wheel; 45. Spiral assembly; 451. Cylinder; 452. Threaded groove; 453. Guide layer; 454. Guide hole; 46. Drilling assembly; 461. Drilling cylinder; 462. Cavity; 463. Cutting plate; 464. Drill block; 5. Drag reduction mechanism; 51. First motor; 52. Lead screw; 53. Lifting platform; 54. Slide rod; 55. Temperature control assembly; 551. Temperature control wall; 552. Sealing cover; 553. Air guide pipe; 554. Second motor; 56. Soil lifting assembly; 561. Rotating pipe; 562. Air guide hole; 563. Conical tip; 564. Spiral blade. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1-3 As shown, the present invention provides a technical solution: a full casing follow-up drill bit device, comprising;

[0037] Base 1, with an extension rod 2 fixedly connected to the bottom of base 1, and a concrete platform 3 fixedly connected to the end of extension rod 2 away from base 1;

[0038] The anti-collapse hole mechanism 4 is located in the middle of the inner side of the base 1; it includes a worm gear 44, the surface of which is rotatably connected to a housing 41, a drive motor 42 is fixedly connected to the top of the base 1 near the housing 41, a worm 43 is fixedly connected to the output end of the drive motor 42, an internal thread is provided on the inner side of the worm gear 44, a spiral assembly 45 is connected to the worm gear 44 through the internal thread, and a drilling assembly 46 is fixedly connected to the bottom end of the spiral assembly 45. The rotation of the worm gear 44 drives the spiral assembly 45 to rotate and move downward, and the drilling assembly 46 drills into the interior of the stratum to form a drilling hole;

[0039] The bottom of the base 1 is in direct contact with the ground, and the concrete platform 3 extends into the interior of the ground. The anti-collapse hole mechanism 4 is screwed into the interior of the ground to drill a hole on the surface. The bottom of the shell 41 is fixedly connected to the top of the base 1 near the middle. The spiral assembly 45 replaces the existing casing to support the drill hole and prevent it from collapsing.

[0040] The drag reduction mechanism 5 is located above the base 1. The drilling component 46 drills into the stratum to form a cylindrical hole. The drag reduction mechanism 5 rotates downward to the inside of the spiral component 45, lifting the soil inside the spiral component 45 out of the stratum, thereby forming a complete drill hole.

[0041] In use, the bottom end of the extension rod 2 extends to a position below the ground. The concrete platform 3 makes the base 1 closely close to the ground, driving the motor 42 to drive the worm 43 to rotate. The surface of the worm 43 meshes with the surface of the worm wheel 44, causing the worm wheel 44 to rotate on the inner side of the housing 41. The worm wheel 44 uses the lifting characteristics of the thread to make the spiral assembly 45 rotate downwards. The drilling assembly 46 drills into the interior of the stratum to form a drill hole. This drill hole is annular. Then, the drag reduction mechanism 5 is used to remove the soil inside the annular hole, replacing the direct forming drill hole in the existing technology. This can effectively reduce the disturbance to the stratum and solve the problem of the drill bit driving the rotation of boulders in the backfill soil, causing a large number of hole collapses.

[0042] like Figure 3 , Figure 4 , Figure 5 As shown, the spiral assembly 45 includes a cylinder 451, with a threaded groove 452 on the surface of the cylinder 451. The surface of the threaded groove 452 is connected to the inner side of the worm gear 44 by threads. A flow guide layer 453 is provided inside the cylinder 451. A flow guide hole 454 communicating with the flow guide layer 453 is provided on the surface of the cylinder 451. The flow guide hole 454 is located below the surface of the cylinder 451. The drilling assembly 46 includes a drilling cylinder 461. The top of the drilling cylinder 461 is fixedly connected to the bottom of the cylinder 451. A cavity 462 is provided on the inner side of the drilling cylinder 461. A cutter plate 463 is fixedly connected to the inner side of the drilling cylinder 461. The cutter plate 463 penetrates the cavity 462 of the drilling cylinder 461. A drilling block 464 is fixedly connected to the bottom of the drilling cylinder 461. A protrusion is provided on the bottom of the drilling block 464.

[0043] In use, the inner side of the worm gear 44 is connected to the surface of the threaded groove 452 via a thread. When the worm gear 44 is driven to rotate by the worm 43, the cylinder 451 is driven to rotate downwards by the threaded groove 452. The bottom of the drill block 464 is screwed into the formation. The protrusion of the drill block 464 makes it easier for the ground to be squeezed into a hole, so that the formation forms an annular drilling hole. The drill block 464 is screwed into the interior of the formation. One side of the cutter plate 463 extends to the outside of the drilling cylinder 461, and the other side of the cutter plate 463 extends to the inner side of the drilling cylinder 461, so that the outer and inner sides of the drilling hole are slightly larger than the inner and outer diameters of the cylinder 451. When it is necessary to screw the cylinder 451 out of the formation, the gap formed by the inner and outer sides can effectively reduce the resistance of the formation to the cylinder 451.

[0044] like Figure 3 , Figure 6 As shown, the worm gear 44 is connected to a helical assembly 45 via an internal thread. A drilling assembly 46 is fixedly connected to the bottom end of the helical assembly 45. The rotation of the worm gear 44 drives the helical assembly 45 to rotate and move downwards, allowing the drilling assembly 46 to drill into the formation and form a borehole. The helical assembly 45 replaces the existing casing to support the borehole and prevent collapse. A housing 41 is rotatably connected to the surface of the worm gear 44. The bottom of the housing 41 is fixedly connected to the top of the base 1 near the center. A drive motor 42 is fixedly connected to the top of the base 1 near the housing 41. The output end of 2 is fixedly connected to a worm gear 43. The drag reduction mechanism 5 includes a first motor 51. The bottom of the first motor 51 is fixedly connected to the top of the base 1 near the edge. The shaft of the output end of the first motor 51 is fixedly connected to a lead screw 52. A lifting platform 53 is threadedly connected to the upper part of the surface of the lead screw 52. A slide rod 54 is slidably connected to the inner side of the lifting platform 53. The bottom end of the slide rod 54 is fixedly connected to the top of the base 1. A temperature control component 55 is fixedly connected to the top of the lifting platform 53. A soil lifting component 56 is fixedly connected to the inner side of the temperature control component 55.

[0045] In use, when the worm gear 44 is driven to rotate by the worm 43, the spiral assembly 45 spirals downward into the interior of the stratum. The drilling assembly 46 rotates and drills into the stratum to form an annular drilling hole. After the drilling hole is formed, the spiral assembly 45 supports the drilling hole to prevent it from collapsing. Subsequently, the first motor 51 drives the lead screw 52 to rotate, and the inner side of the lifting platform 53 slides downward on the surface of the slide rod 54. The temperature control assembly 55 drives the soil lifting assembly 56 to rotate, and the soil lifting assembly 56 spirals into the soil layer inside the spiral assembly 45. When the soil lifting assembly 56 is completely spiraled into the soil layer, the first motor 51 reverses to make the lifting platform 53 move upward, and the soil inside the spiral assembly 45 is lifted out. There is a gap between the spiral assembly 45 and the stratum, which solves the problem of the friction of the entire inner wall of the borehole causing difficulty in pulling out the casing.

[0046] like Figure 6 , Figure 7, Figure 8 As shown, the temperature control component 55 includes a temperature control wall 551, the bottom of which is fixedly connected to the middle of the top of the lifting platform 53. A vent pipe 553 is fixedly connected to the upper part of the surface of the temperature control wall 551. A second motor 554, which is a hollow motor, is fixedly connected to the bottom of the inner side of the temperature control wall 551. A sealing cover 552 is fixedly connected to the top of the temperature control wall 551. The soil lifting component 56 includes a rotating tube 561, the upper part of which is fixedly connected to the inner side of the second motor 554. The top of the rotating tube 561 extends to the upper part of the inner side of the temperature control wall 551. A conical tip 563 is provided at the bottom of the rotating tube 561. A vent hole 562 is provided at the lower part of the surface of the rotating tube 561. A spiral blade 564 is fixedly connected to the surface of the rotating tube 561. The bottom of the spiral blade 564 extends to the conical tip 563.

[0047] In use, after the annular drilling hole is formed, both the inner diameter of the drilling hole and the inner diameter of the spiral assembly 45 are larger than the inner and outer diameters of the spiral assembly 45. At this time, the spiral assembly 45 provides support inside the drilling hole to prevent collapse. When the lifting platform 53 is driven to move downward, the second motor 554 drives the rotating tube 561 to rotate, so that the spiral blade 564 is screwed into the inner side of the spiral assembly 45. The soil on the inner side of the spiral assembly 45 is spiraled out. When the bottom end of the spiral blade 564 reaches the bottom of the spiral assembly 45, the lifting platform 53 moves upward, so that the soil is driven out of the stratum by the spiral blade 564, and the soil on the surface of the spiral blade 564 is cleaned, and the complete drilling hole is formed.

[0048] like Figure 4 , Figure 8 As shown, a threaded groove 452 is formed on the surface of the cylinder 451. The surface of the threaded groove 452 is connected to the inner side of the worm gear 44 by threads. A flow guide layer 453 is provided inside the cylinder 451. A flow guide hole 454 is formed on the surface of the cylinder 451 near the threaded groove 452. The flow guide hole 454 is located at the lower part of the surface of the cylinder 451. The upper part of the surface of the rotating tube 561 is fixedly connected to the inner side of the second motor 554. The top end of the rotating tube 561 extends to the upper part of the inner side of the temperature control wall 551. A tapered tip 563 is provided at the bottom end of the rotating tube 561. An air guide hole 562 is formed at the lower part of the surface of the rotating tube 561. A spiral blade 564 is fixedly connected to the surface of the rotating tube 561. The bottom end of the spiral blade 564 extends to the tapered tip 563.

[0049] During use, the cylinder 451 is positioned below the stratum. After the complete drilling hole is formed, concrete slurry is injected into the cylinder 451. The slurry penetrates into the gap between the threaded groove 452 and the stratum through the guide hole 454. At this time, the lifting platform 53 drives the rotating pipe 561 to rotate into the cylinder 451. Cooling gas is introduced into the air guide pipe 553. The cooling gas diffuses on the inner side of the cylinder 451 through the air guide hole 562, which cools the cylinder 451 and slows down the solidification speed of the slurry near the cylinder 451. The worm gear 43 is driven to move in the opposite direction, causing the cylinder 451 to be rotated out of the stratum. The concrete slurry solidifies in the gap to form a solid support layer, thereby making the anti-collapse hole effect of the device better.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A full casing follow-up drill bit device, characterized in that: include The base (1) has an extension rod (2) fixedly connected to its bottom, and a concrete platform (3) is fixedly connected to one end of the extension rod (2) away from the base (1). The anti-collapse hole mechanism (4) is located in the middle of the inner side of the base (1); it includes a worm wheel (44), the surface of which is rotatably connected to a housing (41), a drive motor (42) is fixedly connected to the top of the base (1) near the housing (41), a worm (43) is fixedly connected to the output end of the drive motor (42), the inner side of the worm wheel (44) is provided with an internal thread, the worm wheel (44) is connected to a spiral assembly (45) through the internal thread, and a drilling assembly (46) is fixedly connected to the bottom end of the spiral assembly (45). The worm wheel (44) rotates and drives the spiral assembly (45) to rotate and move downward, and the drilling assembly (46) drills into the interior of the stratum to form a drilling hole; The drag reduction mechanism (5) is located above the base (1). The drilling component (46) drills into the stratum to form a cylindrical hole. The drag reduction mechanism (5) rotates downward to the inside of the spiral component (45) to lift the soil inside the spiral component (45) out of the stratum, thereby forming a complete drilling hole. The drilling assembly (46) includes a drilling cylinder (461), the top of which is fixedly connected to the bottom of the cylinder body (451), and a cavity (462) is provided on the inner side of the drilling cylinder (461). A blade (463) is fixedly connected to the inner side of the drilling cylinder (461). The blade (463) penetrates the cavity (462) of the drilling cylinder (461). A drilling block (464) is fixedly connected to the bottom of the drilling cylinder (461). A protrusion is provided at the bottom of the drilling block (464). The interior of the cylinder (451) is provided with a flow guide layer (453), and the surface of the cylinder (451) is provided with a flow guide hole (454) that communicates with the flow guide layer (453).

2. The full casing follow-up drill bit device according to claim 1, characterized in that: The bottom of the base (1) is in direct contact with the ground, and the concrete platform (3) extends into the interior of the ground. The anti-collapse hole mechanism (4) is screwed into the interior of the ground to drill a hole on the surface. The bottom of the shell (41) is fixedly connected to the top of the base (1) near the middle. The spiral assembly (45) replaces the existing casing to support the drill hole and prevent it from collapsing.

3. A full guard following drill bit apparatus as defined in claim 2, wherein: The spiral assembly (45) includes a cylinder (451) with a threaded groove (452) on its surface. The surface of the threaded groove (452) is connected to the inner side of the worm gear (44) by threads.

4. A full guard following drill bit apparatus as defined in claim 3, wherein: The flow guide hole (454) is located below the surface of the cylinder (451).

5. A full-protecting back-up drill bit apparatus according to claim 1, wherein: The drag reduction mechanism (5) includes a first motor (51), the bottom of the first motor (51) is fixedly connected to the top of the base (1) near the edge, the output shaft of the first motor (51) is fixedly connected to a lead screw (52), and a lifting platform (53) is threadedly connected to the upper part of the surface of the lead screw (52).

6. The full casing follow-up drill bit device according to claim 5, characterized in that: The inner side of the lifting platform (53) is slidably connected to a slide rod (54), the bottom end of the slide rod (54) is fixedly connected to the top of the base (1), the top of the lifting platform (53) is fixedly connected to a temperature control component (55), and the inner side of the temperature control component (55) is fixedly connected to a soil lifting component (56).

7. A full guard following drill bit apparatus as defined in claim 6, wherein: The temperature control component (55) includes a temperature control wall (551), the bottom of which is fixedly connected to the middle of the top of the lifting platform (53), and a gas guide pipe (553) is fixedly connected to the upper part of the surface of the temperature control wall (551).

8. A full guard following drill bit apparatus as defined in claim 7, wherein: A second motor (554) is fixedly connected to the bottom of the inner side of the temperature control wall (551). The second motor (554) is a hollow motor. A sealing cover (552) is fixedly connected to the top of the temperature control wall (551).

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