CN220415262U - Rotary drilling variable-diameter pilot bit - Google Patents
Rotary drilling variable-diameter pilot bit Download PDFInfo
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- CN220415262U CN220415262U CN202321484617.6U CN202321484617U CN220415262U CN 220415262 U CN220415262 U CN 220415262U CN 202321484617 U CN202321484617 U CN 202321484617U CN 220415262 U CN220415262 U CN 220415262U
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- 238000005553 drilling Methods 0.000 title claims abstract description 122
- 239000011435 rock Substances 0.000 abstract description 22
- 239000002893 slag Substances 0.000 abstract description 10
- 230000036346 tooth eruption Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model discloses a rotary drilling variable-diameter pilot bit, which relates to the technical field of foundation engineering of cast-in-place piles, and comprises a main bit barrel, a connecting barrel and a conical drilling part which are sequentially connected, wherein the bottom end of the main bit barrel is circumferentially provided with a plurality of first picks, the diameter of the connecting barrel is smaller than that of the main bit barrel, and the connecting barrel extends towards the bottom end of the main bit barrel and is coaxially connected with the main bit barrel; the taper drilling part is connected with the end part of the connecting cylinder body extending out of the main drill bit cylinder body, the side wall of the taper drilling part is provided with at least one through hole communicated with the connecting cylinder body, and the taper drilling part is provided with a plurality of second cutting teeth. Positioning is performed through the conical drilling part, the connecting cylinder body guides, and the main drill bit cylinder body is utilized for reaming, so that drilling can be completed without replacing a drill bit, and through holes are formed in the conical drilling part, so that a cut rock ring enters the connecting cylinder body, the time for replacing the slag fishing drill bit is reduced, and the work efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of foundation engineering of cast-in-place piles, in particular to a rotary drilling variable-diameter pilot bit.
Background
In the field of engineering construction at present, the application of bored piles is more and more extensive, and the technology is more and more mature. Especially, the appearance of the rotary drilling rig in recent years gradually replaces other drilling rigs, and the rotary drilling rig becomes a preferred scheme of the bored pile by virtue of the advantages of high efficiency of hole forming, high quality of pile forming, flexibility of construction, controllability of boring verticality and boring depth, strong adaptability of geological conditions and the like. However, when complex rock strata such as pebbles, soft rocks and strong weathering are constructed, the drill bit cannot be uniformly stressed due to uneven geological portions of strata, so that the pore-forming quality is difficult to ensure.
At present, for pile foundations difficult to drill by rotary drilling, more other construction processes such as impact drilling and the like can be selected. However, in the impact process of the impact drill, the reaming coefficient and the verticality of the drill hole are greatly influenced by uncontrollable factors such as geological conditions, drill bit abrasion conditions and the like, so that the quality of the formed hole is uncontrollable. And many construction environments do not allow for a percussion drill construction process. On the other hand, when drilling the large pile diameter, when the hard stratum is encountered after the drilling to a certain depth, the drilling can not be performed due to the fact that the pile diameter is too large, and the grading drilling is needed at this time, namely, the small-diameter drill bit is used for drilling first, and then the large-diameter drill bit is used for drilling.
Therefore, if different drill bits are used for drilling different geological strata, the following technical problems exist: first, constantly changing the drill bit can lead to the problem that the efficiency of construction is low, economic efficiency is low. Secondly, when the grading drilling is finished, the small-diameter drill bit can exist, when the large-diameter drill bit is used for drilling, the cut rock ring is not easy to break, and after the rock ring is drilled to a certain depth, the rock ring can be propped against the top plate of the barrel drill, so that the drilling cannot be continued, and the drill bit can be damaged. Thirdly, during reaming, because the bore diameter is greater than the diameter of the drill rod after reaming, the drill rod can bend downwards under the action of self gravity, so that the drill bit is upward bent, and upward deflection is easily caused during reaming.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a rotary drilling variable-diameter pilot bit so as to solve the problems that the bit needs to be frequently replaced and a cut rock ring can be propped against a top plate of a barrel drill during construction of a rock stratum with a complex address in the prior art, so that continuous drilling cannot be performed.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the application provides a dig reducing pilot bit soon, include:
a plurality of first cutting teeth are circumferentially arranged at the bottom end of the main drill bit barrel;
the connecting cylinder body is smaller than the diameter of the main drill bit cylinder body, extends towards the bottom end of the main drill bit cylinder body and is coaxially connected with the main drill bit cylinder body;
and the conical drilling part is connected with the end part of the connecting cylinder body, which extends out of the main drill bit cylinder body, at least one through hole communicated with the connecting cylinder body is formed in the side wall of the conical drilling part, and a plurality of second cutting teeth are arranged on the conical drilling part.
In some alternative embodiments, two through holes are symmetrically arranged on the side wall of the conical drilling part along the radial line, and the through holes are fan-shaped.
In some alternative embodiments, the conical drilling part comprises two sector plates which are arranged symmetrically along the radial line and form a set angle with the axis of the connecting cylinder, and the two sector plates are arranged at intervals to form two through holes.
In some alternative embodiments, the sector plate has the same area as the through hole.
In some alternative embodiments, two of the sector plates are detachably connected, and the connection part of each sector plate and the connecting cylinder body is in rotary connection.
In some alternative embodiments, the side wall of the sector plate adjacent to the through hole is provided with a plurality of second picks at intervals in the radial direction.
In some alternative embodiments, the main bit barrel is sleeved outside the connecting barrel and is used for being detachably connected to the bit bucket top together with the connecting barrel.
In some alternative embodiments, the outer sidewall of the main bit barrel is provided with a plurality of first helical protrusions axially spaced apart.
In some alternative embodiments, the outer side wall of the connecting cylinder is provided with a plurality of second spiral protrusions at intervals along the axial direction.
In some alternative embodiments, the connecting cylinder is provided with at least one vent hole.
Compared with the prior art, the utility model has the advantages that: the connecting cylinder body with the diameter smaller than that of the main drill bit cylinder body and the conical drilling part connected with the connecting cylinder body are arranged, so that the guiding effect is provided for the main drill bit cylinder body through the drilling of the conical drilling part, and the quality of pile foundation pore forming is ensured; the conical drilling part is provided with the through hole communicated with the connecting cylinder body, so that the cut rock ring can enter the connecting cylinder body, the time for replacing the slag fishing drill bit is reduced, a part of slag soil can be fished out, the process of fishing slag once is reduced, and the work efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a rotary drilling variable diameter pilot bit according to the present utility model;
FIG. 2 is a schematic illustration of the connection of the main bit barrel, the connection barrel, and the tapered drilling portion of FIG. 1;
fig. 3 is a schematic structural diagram of view a of fig. 2.
In the figure: 1. a main bit barrel; 11. a first pick; 12. a first helical projection; 2. a connecting cylinder; 21. a second helical protrusion; 22. a vent hole; 3. a conical drilling section; 31. a through hole; 32. a second pick; 33. a sector plate; 34. a third helical protrusion; 4. a drill bucket top; 41. and (5) a bolt.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
An embodiment of a rotary drilling variable diameter pilot bit according to the present utility model is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the application provides a rotary drilling variable diameter pilot bit, which comprises a main bit barrel 1, a connecting barrel 2 and a conical drilling part 3 which are sequentially connected, wherein the main bit barrel 1, the connecting barrel 2 and the conical drilling part 3 are positioned, the connecting barrel 2 is used for guiding, and the main bit barrel 1 is used for reaming, so that drilling can be completed without replacing a bit.
Specifically, the bottom end of the main drill bit barrel 1 is circumferentially provided with a plurality of first picks 11, the diameter of the connecting barrel 2 is smaller than that of the main drill bit barrel 1, and the connecting barrel extends out towards the bottom end of the main drill bit barrel 1 and is coaxially connected with the main drill bit barrel 1; the taper drilling part 3 is connected to the end of the connecting cylinder 2 extending out of the main drill cylinder 1, at least one through hole 31 communicating with the connecting cylinder 2 is provided on the side wall of the taper drilling part 3, and a plurality of second picks 32 are provided on the taper drilling part 3.
It will be appreciated that the main bit barrel 1 and the connecting barrel 2 are both adapted to be attached to the bit crown 4, and that during drilling, a pilot hole is formed which accommodates the connecting barrel 2 by pre-drilling with a drill bit having the same diameter as the connecting barrel 2. The conical drilling part 3 and the connecting cylinder 2 are placed in the guide hole, and at the moment, the conical drilling part 3 and the connecting cylinder 2 play a role in guiding, so that the main drill cylinder 1 with larger diameter is guided to be reamed. The taper drilling part 3 drills a pilot hole under the drive of a drilling machine, and simultaneously the main bit barrel 1 reams the pilot hole to a designed aperture. Because the conical drilling part 3 is provided with the through hole 31 communicated with the connecting cylinder body 2 in class, at the moment, rock rings and dregs generated during drilling can enter the connecting cylinder body 2 from the through hole 31, the time for replacing the slag fishing drill bit is reduced, the situation that the rock rings are jacked to the conical drilling part 3, the drilling cannot be continued, and the drill bit can be damaged is avoided.
When the drilling reaches a certain depth, the drilling is stopped after the main bit barrel 1 completely enters the drilling, the rotary drilling variable-diameter pilot bit is withdrawn at the moment, and most of dregs can be carried out, so that the time for replacing the dregs-fishing bit is reduced, and the work efficiency is improved.
In some alternative embodiments, two through holes 31 are symmetrically arranged on the side wall of the tapered drilling portion 3 along a radial line, and the through holes 31 are fan-shaped.
It will be appreciated that the two through holes 31 are symmetrically arranged, so that the stability of the overall structure of the tapered drilling portion 3 during the drilling process can be ensured. The through holes 31 are provided in a fan shape so as to maximize the size of the through holes 31 while not affecting the structural strength of the taper drilling portion 3, thereby facilitating entry of the rock ring and the muck into the connecting cylinder 2 at the time of drilling.
The tapered drilling portion 3 is a tapered body having a hollow interior and communicating with the connection cylinder 2, and the large diameter end of the tapered drilling portion 3 is connected to the connection cylinder 2 and has the same diameter. To ensure the effect of drilling, the thickness of the conical drilling section 3 should be ensured.
In some alternative embodiments, as shown in fig. 2 and 3, the tapered drilling part 3 includes two sector plates 33 disposed at a predetermined angle with respect to the axis of the connection cylinder 2 and symmetrically disposed along a radial line, and the two sector plates 33 are disposed at a distance to form two through holes 31.
It will be appreciated that the two sector plates 33 have a set arc and are at a set angle to the axis of the connecting cylinder 2. The tips of the two sector plates 33 are connected to each other, and the arc ends of the two sector plates 33 are connected to the connecting cylinder 2.
In some alternative embodiments, the sector plate 33 has the same area as the through hole 31.
It will be appreciated that in order to allow for the through holes 31 to be sized to allow for the ingress of rock rings and slag while ensuring structural stability of the cone drilling portion 3, in this example, the area of the sector plates 33 and the through holes 31 are set to be the same, i.e. the area of the sector plates 33 is one quarter of the total area of the side walls of the entire cone drilling portion 3.
In other embodiments, the area ratio of sector plate 33 to sector through hole 31 may be specifically set according to drilling needs and formation structure.
In some alternative embodiments, two sector plates 33 are detachably connected, and the connection between each sector plate 33 and the connecting cylinder 2 is in a rotating connection.
In order to facilitate the dumping of rock rings and dregs in the connecting cylinder 2 after the drill withdrawal, the tips of the two sector plates 33 are detachably connected, and the connection part of each sector plate 33 and the connecting cylinder 2 is rotationally connected. After the drill is removed, the two sector plates 33 are separated and rotated away from each other, so that the hollow cavity of the whole connecting cylinder 2 is exposed, and the rock ring and the dregs can be poured conveniently.
In some alternative embodiments, a plurality of the second picks 32 are disposed at radial intervals on the side wall of the sector plate 33 adjacent to the through hole 31.
It will be appreciated that since the sector plate 33 will rotate with the bit driver, in order to increase the drilling effect of the conical drilling section 3 during drilling, a second pick 32 is provided in the side wall of the sector plate 33 adjacent to the through hole 31.
Optionally, a second pick 32 is provided on one side of the direction of rotation of the two sector plates 33.
Of course, a plurality of second picks 32 may be provided on both sides of the two sector plates 33, so that drilling is possible regardless of the direction in which the bit driver is rotated.
In some alternative embodiments, ribs are also provided on sector plate 33.
In some alternative embodiments, the main bit barrel 1 is sleeved outside the connecting barrel 2 and is used together with the connecting barrel 2 to be detachably connected to the bit bucket top 4.
It can be understood that the main drill bit barrel 1 and the connecting barrel 2 are detachably connected to the drill bit bucket top 4, so that the main drill bit barrel and the connecting barrel with suitable diameters can be replaced according to the drilling requirements, and the universality of the equipment is improved.
In this example, the main bit barrel 1 and the connecting barrel 2 are connected to the bit crown 4 with bolts 41 for ease of installation and removal.
In some alternative embodiments, the outer side wall of the main bit barrel 1 is provided with a plurality of first helical protrusions 12 at intervals along the axial direction.
In this example, the first helical projection 12 is a bar piece.
It will be appreciated that the purpose of the first helical projection 12 is to increase friction with the formation during drilling, and that the sharp corners of the steel strip also provide a strong aid in formation drilling. When the drilling tool is carried with slag and lifted in the reverse rotation process, the contact surface between the drilling tool barrel and the hole wall is reduced, and the drilling tool can be effectively prevented from being stuck.
In some alternative embodiments, the outer side wall of the connecting cylinder 2 is provided with a plurality of second spiral protrusions 21 at intervals along the axial direction.
In some alternative embodiments, the outer side wall of the tapered drilling portion 3 is provided with a plurality of third helical protrusions 34 at intervals along the axial direction.
The second helical protuberance 21 and the third helical protuberance 34 are made of steel bars in the same way as the first helical protuberance 12, so that friction force between the steel bars and rock stratum is increased in the drilling process, and sharp corners of the steel bars provide powerful help for rock stratum drilling. When the drilling tool is carried with slag and lifted in the reverse rotation process, the contact surface between the drilling tool barrel and the hole wall is reduced, and the drilling tool can be effectively prevented from being stuck.
Preferably, the first plurality of helical protrusions 12, the second plurality of helical protrusions 21 and the third plurality of helical protrusions 34 are all equally spaced.
In some alternative embodiments, the connecting cylinder 2 is provided with at least one vent hole 22.
It will be appreciated that in order to prevent negative pressure during the drill lifting process, at least one vent hole 22 is provided in the connecting cylinder 2.
In other embodiments, ventilation holes may be provided in the main bit barrel 1.
The working principle of the embodiment of the application is as follows: according to construction requirements, a main drill bit barrel 1 and a connecting barrel 2 with proper diameters are selected and connected to a drill bit bucket top 4 through bolts 41, and when drilling, a drill bit with the same diameter as the connecting barrel 2 is used for pre-drilling, so that a guide hole capable of accommodating the connecting barrel 2 is formed. The conical drilling part 3 and the connecting cylinder 2 are placed in the guide hole, and at the moment, the conical drilling part 3 and the connecting cylinder 2 play a role in guiding, so that the main drill cylinder 1 with larger diameter is guided to be reamed. The taper drilling part 3 drills a pilot hole under the drive of a drilling machine, and simultaneously the main bit barrel 1 reams the pilot hole to a designed aperture. Since the taper drilling portion 3 is provided with the through hole 31 communicating with the connecting cylinder 2, at this time, rock rings and slag generated during drilling can enter into the connecting cylinder 2 from the through hole 31. When the drill hole reaches a certain depth, the drilling is stopped after the main bit barrel 1 completely enters the drill hole, and the rotary drilling variable diameter pilot bit is withdrawn at the moment, the two sector plates 33 are separated and rotated in the direction away from each other, so that the hollow cavity of the whole connecting barrel 2 is exposed, and the rock ring and the dregs are conveniently poured.
According to the rotary drilling variable-diameter pilot bit, the connecting cylinder body 2 with the smaller diameter than the main bit cylinder body 1 is arranged, so that the connecting cylinder body 2 can be used for guiding, the main bit cylinder body 1 is used for reaming, and drilling can be completed without replacing a bit; the connecting cylinder body 2 and the conical drilling part 3 are used for guiding drilling, so that the verticality of pile foundation pore-forming can be effectively ensured; the conical drilling part 3 is provided with the through hole 31 communicated with the connecting cylinder body 2, so that rock rings and dregs generated during drilling can enter the connecting cylinder body 2 from the through hole 31, the time for replacing a slag fishing drill bit is shortened, and the problems that the rock rings are propped against the conical drilling part 3, continuous drilling cannot be performed and the drill bit is damaged are solved; the two sector plates 33 are detachably connected, and the joint of each sector plate 33 and the connecting cylinder 2 is in rotary connection, so that the sector plates 33 are conveniently opened to dump rock rings and dregs in the connecting cylinder 2; the main drill bit barrel 1 and the connecting barrel 2 are detachably connected to the drill bit bucket top 4, so that the main drill bit barrel and the connecting barrel with the proper diameters can be replaced according to the drilling requirements, and the universality of equipment is improved.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A rotary drilling variable diameter pilot bit, comprising:
a main bit barrel (1) with a plurality of first picks (11) circumferentially arranged at the bottom end;
the connecting cylinder body (2) is smaller than the diameter of the main drill bit cylinder body (1) and extends towards the bottom end of the main drill bit cylinder body (1) to be coaxially connected with the main drill bit cylinder body (1);
the conical drilling part (3) is connected to the end part of the connecting cylinder body (2) extending out of the main drill bit cylinder body (1), at least one through hole (31) communicated with the connecting cylinder body (2) is formed in the side wall of the conical drilling part (3), and a plurality of second cutting picks (32) are arranged on the conical drilling part (3).
2. Rotary drilling variable diameter pilot bit according to claim 1, characterized in that two through holes (31) are arranged radially line symmetrically on the side wall of the conical drilling part (3), and in that the through holes (31) are sector-shaped.
3. Rotary drilling variable diameter pilot bit according to claim 2, characterized in that the conical drilling part (3) comprises two sector plates (33) which are arranged symmetrically in radial direction and form a set angle with the axis of the connecting cylinder (2), the two sector plates (33) being arranged at intervals to form two through holes (31).
4. A rotary drill variable diameter pilot bit according to claim 3, characterized in that the sector plate (33) has the same area as the through hole (31).
5. A rotary drill variable diameter pilot bit according to claim 3, characterized in that two sector plates (33) are detachably connected, each sector plate (33) being rotatably connected to the connection of the connecting cylinder (2).
6. A rotary steerable drill bit according to claim 3, characterized in that the side wall of the sector plate (33) adjacent to the through hole (31) is provided with a plurality of the second picks (32) at radial intervals.
7. The rotary drilling variable diameter pilot bit according to claim 1, characterized in that the main bit barrel (1) is sleeved outside the connecting barrel (2) and is used for being detachably connected to a bit bucket top (4) together with the connecting barrel (2).
8. The rotary drilling variable diameter pilot bit according to claim 1, characterized in that the outer side wall of the main bit barrel (1) is provided with a plurality of first helical protrusions (12) at intervals along the axial direction.
9. The rotary drilling variable diameter pilot bit according to claim 1, wherein a plurality of second spiral protrusions (21) are axially arranged on the outer side wall of the connecting cylinder (2) at intervals.
10. Rotary drilling variable diameter pilot bit according to claim 1, characterized in that the connecting cylinder (2) is provided with at least one vent hole (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321484617.6U CN220415262U (en) | 2023-06-12 | 2023-06-12 | Rotary drilling variable-diameter pilot bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321484617.6U CN220415262U (en) | 2023-06-12 | 2023-06-12 | Rotary drilling variable-diameter pilot bit |
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| Publication Number | Publication Date |
|---|---|
| CN220415262U true CN220415262U (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321484617.6U Active CN220415262U (en) | 2023-06-12 | 2023-06-12 | Rotary drilling variable-diameter pilot bit |
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| CN (1) | CN220415262U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118029929A (en) * | 2024-04-11 | 2024-05-14 | 陕西建一建设有限公司 | Rotary drilling device for bridge construction |
-
2023
- 2023-06-12 CN CN202321484617.6U patent/CN220415262U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118029929A (en) * | 2024-04-11 | 2024-05-14 | 陕西建一建设有限公司 | Rotary drilling device for bridge construction |
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