CN114934749A - Drill bit for filling pile - Google Patents

Abstract

The application relates to a drill bit for a cast-in-place pile, which belongs to the field of cast-in-place equipment and comprises a foundation drill and a connecting rod, wherein the foundation drill is coaxially connected with the connecting rod; the basic drill is provided with an extension rod, one end of the extension rod is arranged at the top end of the side wall of the basic drill, the other end of the extension rod extends towards the direction far away from the axis of the basic drill, and the extension rod is provided with cutting teeth; and a driving mechanism is connected between the extension rod and the connecting rod and is used for driving the extension rod to move towards the direction close to the connecting rod. This application helps reducing bored concrete pile work progress's manpower and materials.

Description

Drill bit for filling pile

Technical Field

The application relates to the field of filling equipment, in particular to a drill bit for a filling pile.

Background

When the cast-in-place pile is constructed, firstly, a drill bit with a larger diameter is used for reaming the bottom surface, and a steel casing is arranged in the reamed hole; then, replacing the drill bit, and drilling on the bottom wall of the expanded hole and in the steel casing to form a pile hole; and finally, placing a pile made of a reinforcement cage and poured concrete into the pile hole to complete construction.

In the process of implementing the present application, the inventors found that the above-mentioned technology has at least the following problems: in the process of reaming and drilling the ground, the drill bit needs to be replaced, the replacement process is complex, and manpower and material resources in the construction process of the cast-in-place pile are increased easily.

Disclosure of Invention

In order to help reducing bored concrete pile work progress's manpower and materials, this application provides a drill bit for bored concrete pile.

The application provides a drill bit for bored concrete pile adopts following technical scheme:

a drill bit for a cast-in-place pile comprises a foundation drill and a connecting rod, wherein the foundation drill is coaxially connected with the connecting rod; the basic drill is provided with an extension rod, one end of the extension rod is arranged at the top end of the side wall of the basic drill, the other end of the extension rod extends towards the direction far away from the axis of the basic drill, and the extension rod is provided with cutting teeth; and a driving mechanism is connected between the extension rod and the connecting rod and is used for driving the extension rod to move towards the direction close to the connecting rod.

By adopting the technical scheme, when the hole is expanded on the ground, the base drill is abutted against the ground, and the connecting rod is rotated, so that the base drill and the extension rod can rotate by taking the axis of the connecting rod as a central line; when needs are drilled on ground, the extension rod is driven by the driving mechanism to move towards the direction close to the connecting rod, so that the cutting teeth are withdrawn, then the connecting rod is driven to rotate, and the foundation drill drills on the bottom wall of the reaming hole to form a pile hole. The drill bit does not need to be disassembled and replaced in the process, and manpower and material resources in the cast-in-place pile construction process are reduced.

In a specific implementation mode, the driving mechanism comprises a sliding assembly, a bearing rod and a first rotating rod hinged between the sliding assembly and the bearing rod, a guide rod is arranged on the connecting rod, the guide rod is arranged along the length direction of the connecting rod, and the sliding assembly is used for moving on the guide rod; the bearing rod is arranged at the top end of the basic drill, a second rotating rod is hinged between the bearing rod and the connecting rod, and a supporting frame is connected between the extending rod and the bearing rod.

Through adopting above-mentioned technical scheme, drive slip subassembly is to the direction motion of keeping away from the connecting rod, and slip subassembly passes through first bull stick pulling carrier bar and moves to the direction that is close to the connecting rod, because the extension rod passes through the support frame and links together with the carrier bar, and the carrier bar can drive the connecting rod and move together, and then withdraws the cutting tooth on the extension rod to carry out the drilling operation.

In a specific implementation scheme, the sliding assembly comprises a sliding table and a fixing ring sleeved outside the sliding table, the guide rod penetrates through the sliding table and is in threaded connection with the sliding table, and the fixing ring is used for rotating relative to the sliding table by taking an axis of the guide rod as a central line; the first rotating rod is hinged to the fixing ring.

By adopting the technical scheme, the sliding table is rotated to move in the direction away from the connecting rod; in the sliding table rotating process, the sliding table and the fixing ring rotate relatively, the fixing ring can move along with the sliding table in the direction away from the connecting rod, the first rotating rod is pulled, and then the cutting teeth on the extension rod are retracted.

In a specific implementation mode, a first fixing rod is arranged on the side wall of the connecting rod, and a supporting rod is hinged to the first fixing rod; the side wall of the bearing rod is provided with a supporting block, a second fixing rod is arranged on the supporting block, and one end, far away from the first fixing rod, of the supporting rod is detachably connected with the supporting rod.

By adopting the technical scheme, when the hole expanding operation is carried out, the first fixing rod, the second fixing rod and the supporting rod are connected together to support the bearing rod, so that the supporting force of the first rotating rod and the second rotating rod on the bearing rod is shared conveniently, and the first rotating rod and the second rotating rod are prevented from being broken during the hole expanding process as much as possible; when drilling operation is needed, the second fixing rod and the support rod are disconnected, and the support rod is retracted, so that the bearing rod is driven to move towards the direction close to the connecting rod.

In a specific possible implementation scheme, a through groove is formed in the side wall of the first fixing rod, and one end of the supporting rod is hinged in the through groove; the outer side of the first fixing rod is sleeved with a first pipe sleeve, one end, close to the first fixing rod, of the supporting rod is located in the first pipe sleeve, and the first fixing rod is in threaded connection with the first pipe sleeve.

Through adopting above-mentioned technical scheme, first pipe box helps consolidating the connection between first solid pole and the bracing pole, avoids the disconnection of being connected between first solid pole and the bracing pole as far as possible.

In a specific possible implementation scheme, a second pipe sleeve is sleeved outside the second fixed rod, one end, close to the second fixed rod, of the support rod is located in the second pipe sleeve, and the second fixed rod is in threaded connection with the second pipe sleeve.

By adopting the technical scheme, the second fixing rod and the supporting rod are connected together through the second pipe sleeve; when the supporting rod needs to be retracted, the second pipe sleeve is rotated to enable the second pipe sleeve to rotate down from the second fixing rod, so that the supporting rod and the second fixing rod can be disconnected, and the detachable connection of the supporting rod and the second fixing rod is further realized.

In a specific possible embodiment, a third pipe sleeve is arranged outside the supporting rod, and the ends of the first pipe sleeve and the second pipe sleeve, which face away from each other, are both located in the third pipe sleeve; a guide groove is formed in the inner side wall of the third pipe sleeve and is arranged along the length direction of the third pipe sleeve, slide bars are arranged on the outer side wall of the first pipe sleeve and the outer side wall of the second pipe sleeve respectively and are arranged along the length direction of the supporting bar, the slide bars extend into the guide groove, and the slide bars are in sliding fit with the guide groove; the internal threads on the first pipe sleeve are opposite in direction to the internal threads on the second pipe sleeve.

By adopting the technical scheme, the sliding rod on the first pipe sleeve and the sliding rod in the second pipe sleeve are both positioned in the guide groove, so that when the third pipe sleeve is rotated, the first pipe sleeve and the second pipe sleeve both rotate by taking the axis of the supporting rod as a central line; and because the internal thread on the first pipe sleeve and the internal thread on the second pipe sleeve are opposite in direction, the first pipe sleeve and the second pipe sleeve can move towards the direction close to each other, so that the first pipe sleeve is turned down from the first fixed rod, and meanwhile, the second pipe sleeve is turned down from the second fixed rod, so that the operation is convenient.

In a specific possible implementation scheme, a connecting ring is arranged on the third pipe sleeve, an abdicating groove is formed in the side wall of the connecting rod, and one end of the connecting ring, which is far away from the connecting ring, is used for extending into the abdicating groove; an accommodating cavity is formed in one side, located in the abdicating groove, of the connecting rod, an inserting rod is arranged on the connecting rod, one end of the inserting rod is inserted into the accommodating cavity, and the other end of the inserting rod penetrates through the side wall of the accommodating cavity and extends into the abdicating groove; the spring is arranged in the accommodating cavity, and the connecting rod is abutted to the inner side wall of the abdicating groove under the action of the spring.

Through adopting above-mentioned technical scheme, putting down the back with the bracing piece, will bracing piece go up the go-between insert the inslot of stepping down to insert in the go-between through the inserted bar, realize the fixed to the go-between position, and then realize the fixed to bracing piece position, avoid the in-process bracing piece swing back and forth at drilling as far as possible.

In a specific implementation scheme, a sliding groove is formed in the inner wall of the accommodating cavity, the accommodating cavity is externally communicated through the sliding groove, and the sliding groove is arranged along the length direction of the connecting rod; a push rod is arranged on the inserted link, and one end of the push rod, which is far away from the inserted link, extends out of the chute.

By adopting the technical scheme, the push rod is manually pulled to slide in the sliding groove, so that the insertion rod is retracted into the accommodating cavity, and the connecting ring is conveniently inserted into the abdicating groove; then the push rod is loosened, the inserted rod extends out of the containing cavity under the action of the spring and passes through the connecting ring to abut against the inner surface of the abdicating groove, and the position of the connecting ring is fixed.

In a specific possible embodiment, a support frame is arranged on the driving mechanism and at the top end of the extension rod, and cutting teeth are arranged on the side wall of the support frame far away from the driving mechanism.

Through adopting above-mentioned technical scheme, the timbering provides decurrent holding power to the extension rod, avoids the extension rod to take place to buckle when reaming as far as possible.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the hole is expanded on the ground, the base drill is abutted against the ground, and the connecting rod is rotated, so that the base drill and the extension rod can rotate by taking the axis of the connecting rod as a central line; when needs are bored to ground, through the direction motion of actuating mechanism drive extension rod to being close to the connecting rod, make the cutting teeth withdraw, drive the connecting rod and rotate after that, make the basis bore and bore on the reaming diapire, form the stake hole. In the process, the drill bit does not need to be disassembled and replaced, so that the manpower and material resources in the cast-in-place pile construction process are reduced;

2. the rotary table is rotated, the rotary table moves towards the direction far away from the connecting rod, the fixing ring can move along the same direction, the first rotating rod and the second rotating rod are pulled to rotate, the bearing rod moves towards the direction close to the connecting rod under the pulling of the first rotating rod and the second rotating rod, and then the cutting teeth are retracted, so that the subsequent drilling operation can be carried out.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a sliding assembly according to an embodiment of the present application.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

Fig. 4 is a cross-sectional view of a third pipe sleeve of an embodiment of the present application.

FIG. 5 is a cross-sectional view of a connecting rod of an embodiment of the present application.

Description of the reference numerals: 1. an extension pole; 11. cutting teeth; 12. a support frame; 13. a support frame; 2. drilling a foundation; 3. a connecting rod; 31. a guide rod; 32. a first fixing rod; 321. a through groove; 33. a yielding groove; 34. an accommodating cavity; 35. inserting a rod; 36. a spring; 37. a chute; 4. a drive mechanism; 41. a carrier bar; 411. a support block; 412. a second fixing rod; 42. a first rotating lever; 43. a second rotating rod; 5. a sliding assembly; 51. a sliding table; 511. a ring groove; 52. a fixing ring; 53. a bearing; 6. a support rod; 61. a first pipe sleeve; 611. a slide bar; 62. a second pipe sleeve; 63. a third pipe sleeve; 631. a guide groove; 632. and (7) connecting rings.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a drill bit for bored concrete pile. Referring to fig. 1, the drill bit for the bored concrete pile includes that 2 and connecting rod 3 are bored to the basis of a plurality of extension rods 1, coaxial setting, and wherein, connecting rod 3 is connected and is bored 2 tops at the basis, and 2 top edges are all bored on the basis to the one end of every extension rod 1, and extension rod 1 is located one side of connecting rod 3 to the other end of every extension rod 1 all extends to the direction of keeping away from connecting rod 3. A plurality of cutting teeth 11 extend from the side wall of the extension rod 1 far away from the connecting rod 3, and the cutting teeth 11 are distributed along the length direction of the connecting rod 3. A driving mechanism 4 is connected between the extension rod 1 and the connecting rod 3, and the driving mechanism 4 is used for driving each extension rod 1 to move towards the direction close to the connecting rod 3.

Referring to fig. 1, when a hole expanding operation is performed, the connecting rod 3 is driven to rotate, the base drill 2 and the extension rod 1 are driven to rotate together, and the cutting teeth 11 on the base drill 2 are in contact with soil, so that the drill bit drills into the ground; after the hole is enlarged, the extension rod 1 is driven by the driving mechanism 4 to move towards the direction close to the connecting rod 3, and the cutting teeth 11 are retracted, so that the cutting teeth 11 are not in contact with soil when the hole is drilled. The drill bit does not need to be disassembled and replaced in the process, and manpower and material resources in the cast-in-place pile construction process are reduced.

Referring to fig. 1, the driving mechanism 4 includes a plurality of carrying rods 41 corresponding to the extension rods 1 one by one, the carrying rods 41 are annularly distributed on the outer side of the connecting rod 3, and a supporting frame 12 is connected between the carrying rods 41 and the corresponding extension rods 1. Every carrier bar 41 all links firmly a support frame 13 on keeping away from the lateral wall of connecting rod 3, and every support frame 13 all sets up on the top of extension rod 1 along vertical direction, extends a plurality of cutting teeth 11 on the lateral wall that support frame 13 kept away from carrier bar 41. The support frame 12 and the support frame 13 both contribute to the support of the extension pole 1.

Referring to fig. 2, the driving mechanism 4 further includes a sliding assembly 5 and a first rotating lever 42 hinged between the carrying lever 41 and the sliding assembly 5. Wherein, the one end coaxial coupling that connecting rod 3 kept away from the drill bit has guide bar 31, and sliding assembly 5 is used for removing on guide bar 31, and it has two second bull sticks 43 to articulate between carrier bar 41 and the connecting rod 3, and one of them second bull stick 43 is connected on carrier bar 41 top, and another second bull stick 43 is connected in carrier bar 41 bottom. When the driving mechanism 4 moves on the guide rod 31 in a direction away from the connecting rod 3, the first rotating rod 42 is pulled to rotate, and the bearing rod 41 is pulled by the first rotating rod 42 to approach in a direction close to the connecting rod 3, so that the cutting teeth 11 are retracted.

Referring to fig. 1 and 2, the slide module 5 includes a slide table 51 and a fixing ring 52, the guide rod 31 penetrates through the center of the slide table 51, and the guide rod 31 is screwed with the slide table 51; the sliding table 51 is provided with a ring groove 511, the ring groove 511 is circumferentially arranged on the outer side wall of the sliding table 51, the fixing ring 52 is positioned in the ring groove 511, and the first rotating rod 42 is hinged on the fixing ring 52; the bearing 53 is connected between the fixing ring 52 and the front of the inner side wall of the ring groove 511, and the fixing ring 52 and the sliding table 51 can rotate relatively. By rotating the sliding table 51, the sliding table 51 drives the fixing ring 52 to move together in a direction away from the connecting rod 3, and further the first rotating rod 42 is pulled to rotate, so that the bearing rod 41 moves in a direction close to the connecting rod 3.

Referring to fig. 3 and 4, a supporting block 411 extends from a side wall of the carrying rod 41, a second fixing rod 412 is fixedly connected to a side wall of the supporting block 411 facing the connecting rod 3, a first fixing rod 32 is fixedly connected to a side wall of the connecting rod 3, and the first fixing rod 32 and the second fixing rod 412 are oppositely arranged. A through groove 321 is formed in the side wall of the first fixing rod 32, the through groove 321 penetrates through the first fixing rod 32 along the vertical direction, and the through groove 321 extends towards the direction close to the second fixing rod 412. A supporting rod 6 is hinged in the through groove 321, a first pipe sleeve 61 is sleeved on the outer side of the first fixing rod 32, the first pipe sleeve 61 is in threaded connection with the first fixing rod 32, one end, close to the first fixing rod 32, of the supporting rod 6 is located in the first pipe sleeve 61, the supporting rod 6 is in threaded connection with the first pipe sleeve 61, and the supporting rod 6 is fixed to the position of the supporting rod 6. A second pipe sleeve 62 is sleeved on the outer side of the second fixed rod 412, and the second pipe sleeve 62 is in threaded connection with the second fixed rod 412; one end of the support rod 6, which is far away from the through slot 321, extends into the second fixing rod 412, and the support rod 6 is in threaded connection with the second fixing rod 412, so that the support rod 6 is connected with the second fixing rod 412.

Referring to fig. 3 and 4, the hinged portion of the supporting rod 6 and the first fixing rod 32 is fixed through the first sleeve 61, and the supporting rod 6 and the second fixing rod 412 are connected through the second sleeve 62, so that the supporting rod 6, the first fixing rod 32 and the second fixing rod 412 are on the same straight line, and play a horizontal supporting force for the bearing rod 41, so as to share the supporting force of the first rotating rod 42 and the second rotating rod 43 for the bearing rod 41. When the bearing rod 41 needs to be retracted, the second sleeve 62 is rotated, the second sleeve 62 can move in a direction away from the second fixing rod 412, and the connection between the second fixing rod 412 and the support rod 6 can be disconnected; meanwhile, the first sleeve 61 is rotated to move the first sleeve 61 in a direction away from the first fixing rod 32, so that the supporting rod 6 naturally hangs down under the influence of gravity, thereby releasing the support of the bearing rod 41.

Referring to fig. 4, the outer side of the supporting rod 6 is sleeved with a third sleeve 63, and the ends of the first sleeve 61 and the second sleeve 62, which are away from each other, are located in the third sleeve 63. A guide groove 631 is formed in the inner side wall of the third pipe sleeve 63, and the guide groove 631 is formed along the length direction of the third pipe sleeve 63; the outer side wall of the first pipe sleeve 61 and the outer side wall of the second pipe sleeve 62 are integrally formed with a sliding rod 611, the sliding rod 611 is arranged along the length direction of the supporting rod 6, and both the sliding rods 611 extend into the guide groove 631. By rotating the third sleeve 63, the first sleeve 61 and the second sleeve 62 are rotated around the axis of the strut 6 by the sliding rod 611, and the first sleeve 61 and the second sleeve 62 are displaced in the length direction of the strut 6.

Referring to fig. 4, the direction of the internal thread of the first socket 61 connected to the first fixing rod 32 is opposite to the direction of the internal thread of the second socket 62 connected to the second fixing rod 412, so that when the third socket 63 is rotated, the first socket 61 and the second socket 62 move in a direction to approach each other, thereby removing the first socket 61 from the first fixing rod 32 and simultaneously removing the second socket 62 from the second fixing rod 412.

Referring to fig. 5, the sidewall of the connecting rod 3 is provided with a relief groove 33 corresponding to the third sleeve 63. An accommodating cavity 34 is formed in one side, located in the yielding groove 33, of the connecting rod 3, an inserting rod 35 is arranged on the connecting rod 3, one end of the inserting rod 35 is inserted into the accommodating cavity 34, a spring 36 is connected between the inner surface of the accommodating cavity 34 and the inner surface of the inserting rod 35, and the other end of the inserting rod 35 penetrates through the inner surface of the accommodating cavity 34 and extends into the yielding groove 33. Under the action of the spring 36, the plunger 35 abuts against the inner surface of the relief groove 33.

Referring to fig. 3, a connection ring 632 is integrally formed on an outer side wall of the third socket 63, one end of the connection ring 632, which is away from the third socket 63, is used to be inserted into the corresponding abdicating groove 33, and the insertion rod 35 in the corresponding abdicating groove 33 is used to pass through the connection ring 632, thereby fixing the connection ring 632 in the abdicating groove 33. The third pipe sleeve 63 and the support rod 6 are prevented from being swung back and forth during the drilling operation.

Referring to fig. 3, a sliding groove 37 is formed in the inner side wall of the accommodating cavity 34, the accommodating cavity 34 is communicated with the outside through the sliding groove 37, and the sliding groove 37 is arranged along the length direction of the connecting rod 3. A push rod extends from the insert rod 35, and one end of the push rod, which is far away from the insert rod 35, extends out of the slide groove 37. The push rod is manually pulled, the plug rod 35 is retracted into the accommodating cavity 34, so that the connecting ring 632 is inserted into the avoiding groove 33 or pulled out of the avoiding groove 33; after releasing the push rod, the plunger 35 can be extended from the receiving chamber 34 by the spring 36.

The implementation principle of a drill bit for bored concrete pile of the embodiment of this application does: through the rotation of drive connecting rod 3, drive basic brill 2 and extension rod 1 and rotate together, then the cutting teeth 11 and basic brill 2 on the extension rod 1 can carry out the reaming operation to ground.

After the reaming operation is completed, the third sleeve 63 is rotated so that the first sleeve 61 is separated from the first fixing bar 32 and the second sleeve 62 is separated from the second fixing bar 412. Then the push rod is pulled to withdraw the inserting rod 35 into the accommodating cavity 34, so that the support rod 6 naturally hangs down, the connecting ring 632 on the third pipe sleeve 63 is inserted into the abdicating groove 33, after the push rod is released, the inserting rod 35 extends out of the accommodating cavity 34 under the action of the spring 36 and passes through the connecting ring 632 to abut against the inner surface of the abdicating groove 33, the connecting ring 632 is fixed in the abdicating groove 33, and the position fixing of the third pipe sleeve 63 and the support rod 6 is realized. Finally, the slide table 51 is rotated to move the slide table 51 in a direction away from the connector link 3, and the fixing ring 52 is moved together in a direction away from the connector link 3. The fixing ring 52 moves the bearing rod 41 to a direction close to the connecting rod 3 by pulling the first connecting rod 3 when moving, and then retracts the extension rod 1 to drill the ground.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A drill bit for a cast-in-place pile is characterized in that: the device comprises a basic drill (2) and a connecting rod (3), wherein the basic drill (2) is coaxially connected with the connecting rod (3); an extension rod (1) is arranged on the basic drill (2), one end of the extension rod (1) is arranged at the top end of the side wall of the basic drill (2), the other end of the extension rod (1) extends towards the direction far away from the axis of the basic drill (2), and cutting teeth (11) are arranged on the extension rod (1); a driving mechanism (4) is connected between the extension rod (1) and the connecting rod (3), and the driving mechanism (4) is used for driving the extension rod (1) to move towards the direction close to the connecting rod (3).

2. A drill bit for a bored concrete pile according to claim 1, wherein: the driving mechanism (4) comprises a sliding assembly (5), a bearing rod (41) and a first rotating rod (42) hinged between the sliding assembly (5) and the bearing rod (41), a guide rod (31) is arranged on the connecting rod (3), the guide rod (31) is arranged along the length direction of the connecting rod (3), and the sliding assembly (5) is used for moving on the guide rod (31); the bearing rod (41) is arranged at the top end of the basic drill (2), a second rotating rod (43) is hinged between the bearing rod (41) and the connecting rod (3), and a supporting frame (12) is connected between the extension rod (1) and the bearing rod (41).

3. A drill bit for a bored concrete pile according to claim 2, wherein: the sliding assembly (5) comprises a sliding table (51) and a fixing ring (52) sleeved on the outer side of the sliding table (51), the guide rod (31) penetrates through the sliding table (51) and is in threaded connection with the sliding table (51), and the fixing ring (52) is used for rotating relative to the sliding table (51) by taking the axis of the guide rod (31) as a central line; the first rotary rod (42) is hinged to the fixed ring (52).

4. A drill bit for a bored concrete pile according to claim 2, wherein: a first fixing rod (32) is arranged on the side wall of the connecting rod (3), and a supporting rod (6) is hinged to the first fixing rod (32); the side wall of the bearing rod (41) is provided with a supporting block (411), the supporting block (411) is provided with a second fixing rod (412), and one end, far away from the first fixing rod (32), of the supporting rod (6) is detachably connected with the supporting rod (6).

5. A drill bit for a bored concrete pile according to claim 4, wherein: a through groove (321) is formed in the side wall of the first fixing rod (32), and one end of the supporting rod (6) is hinged in the through groove (321); the outer side of the first fixed rod (32) is sleeved with a first pipe sleeve (61), one end, close to the first fixed rod (32), of the supporting rod (6) is located in the first pipe sleeve (61), and the first fixed rod (32) is in threaded connection with the first pipe sleeve (61).

6. A drill bit for a bored concrete pile according to claim 5, wherein: a second pipe sleeve (62) is sleeved on the outer side of the second fixing rod (412), one end, close to the second fixing rod (412), of the supporting rod (6) is located in the second pipe sleeve (62), and the second fixing rod (412) is in threaded connection with the second pipe sleeve (62).

7. A drill bit for a bored concrete pile according to claim 6, wherein: a third pipe sleeve (63) is arranged on the outer side of the supporting rod (6), and one ends of the first pipe sleeve (61) and the second pipe sleeve (62) which are deviated from each other are both positioned in the third pipe sleeve (63); a guide groove (631) is formed in the inner side wall of the third pipe sleeve (63), the guide groove (631) is formed in the length direction of the third pipe sleeve (63), slide bars (611) are arranged on the outer side wall of the first pipe sleeve (61) and the outer side wall of the second pipe sleeve (62), the slide bars (611) are arranged in the length direction of the support bar (6), the slide bars (611) extend into the guide groove (631), and the slide bars (611) are in sliding fit with the guide groove (631); the internal thread on the first sleeve (61) is in the opposite direction to the internal thread on the second sleeve (62).

8. A drill bit for a bored concrete pile according to claim 7, wherein: a connecting ring (632) is arranged on the third pipe sleeve (63), an abdicating groove (33) is formed in the side wall of the connecting rod (3), and one end, far away from the connecting ring (632), of the connecting ring (632) is used for extending into the abdicating groove (33); an accommodating cavity (34) is formed in one side, located in the yielding groove (33), of the connecting rod (3), an inserting rod (35) is arranged on the connecting rod (3), one end of the inserting rod (35) is inserted into the accommodating cavity (34), and the other end of the inserting rod (35) penetrates through the inner side wall of the accommodating cavity (34) and extends into the yielding groove (33); a spring (36) is arranged in the accommodating cavity (34), and the connecting rod (3) abuts against the inner side wall of the abdicating groove (33) under the action of the spring (36).

9. A drill bit for a bored concrete pile according to claim 8, wherein: a sliding groove (37) is formed in the inner wall of the accommodating cavity (34), the accommodating cavity (34) is communicated with the outside through the sliding groove (37), and the sliding groove (37) is formed along the length direction of the connecting rod (3); a push rod is arranged on the inserted link (35), and one end, far away from the inserted link (35), of the push rod extends out of the sliding groove (37).

10. A drill for a bored pile according to any one of claims 1 to 9, wherein: a support frame (13) is arranged on the driving mechanism (4) and at the top end of the extension rod (1), and cutting teeth (11) are arranged on the side wall, far away from the driving mechanism (4), of the support frame (13).

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