CN214145376U - Fan blade type super-large-diameter rotary drilling bit - Google Patents
Fan blade type super-large-diameter rotary drilling bit Download PDFInfo
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- CN214145376U CN214145376U CN202120108501.7U CN202120108501U CN214145376U CN 214145376 U CN214145376 U CN 214145376U CN 202120108501 U CN202120108501 U CN 202120108501U CN 214145376 U CN214145376 U CN 214145376U
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Abstract
The utility model discloses a fan blade type ultra-large diameter rotary drilling bit, which relates to the technical field of rotary drilling technology, and comprises a bit body, wherein the bit body comprises a central body, the bottom of the central body is provided with a cutting disc, and the top of the central body is provided with a connecting side for connecting a drill rod; the reaming wings are arranged and evenly distributed on the side wall of the central body, and the bottoms of the reaming wings are higher than the bottom of the central body; toothed plates are arranged at the bottoms of the reaming wings and the cutting disc. The utility model discloses the maximum diameter of increase drill bit body solves the current difficult problem of digging the technology soon and being unable to be applied to super large diameter bored concrete pile construction field by the drill bit restriction, widens the application market who digs the rig soon.
Description
Technical Field
The utility model relates to a dig technology technical field soon, especially relate to a drill bit is dug soon to fan blade type super large diameter.
Background
At present, in the construction of urban high-rise buildings, subways, loop lines, light rails, high-speed and high-speed railways and the like in China, the rotary excavating process is widely popularized and applied in the field of large-diameter cast-in-place pile foundation construction by means of the remarkable characteristics of high construction speed, strong bearing capacity, low cost, strong stratum practicability and the like.
Wherein, the large diameter pile refers to a bored pile with the diameter of more than or equal to 2.50 meters, and the super large diameter pile refers to a pile with the diameter of more than 3.5 meters.
Rotary drilling process (rotary drilling rig, rotary drill bit): the rotary drilling rig is a comprehensive drilling rig, can use various bottom layers, and has the characteristics of high hole forming speed, less pollution, strong maneuverability and the like; the rotary excavating machine adopts a plurality of layers of telescopic drill rods, has less drilling auxiliary time and low labor intensity, does not need mud to discharge slag circularly, saves cost and is suitable for the construction of pile foundations such as urban construction, bridges and the like; the rotary drilling bit is connected with the main body of the rotary drilling rig and is main equipment for drilling.
As shown in fig. 3, the maximum drilling diameter of the rotary drilling rig is determined by the distance D between the center of the drill rod and the mast, and if the used drill bit radius exceeds the distance, the drill bit bucket will interfere with the mast when lifted. At present, the torque of the largest rotary drilling rig-800E rotary drilling rig in China is 793KN.m, the distance between the center of a drill rod and a mast is 2500mm, namely the maximum diameter of the drill rod allowed to rotate is 5000mm, and how to break through the distance limitation is the most key technical difficulty for breaking through the super-large diameter construction by the rotary drilling technology.
The maximum diameter rotary drilling bit produced in China at present is
A cutting pick sand scoop, the maximum diameter of the cast-in-place pile constructed by the domestic rotary drilling rig is
The general slag unloading mode of the domestic bailing bucket at present is as follows: lifting the drill bit to the upper part of the mast by the drill rod, pushing the opening and closing mechanism of the drill bit by the power head pressure plate, opening the bottom door, discharging soil and rotationally throwing the soil; the super large diameter drill bit is designed, if a conventional circular shape and an opening and closing structure are used, the drill bit cannot be lifted to the upside of a mast, a bottom door of the whole drill bit cannot be pressed open through a pressure plate (the inner diameter and the outer diameter of the pressure plate are only 820mm/1420mm, and the diameter of the bottom door of the drill bit is at least 3000mm), and soil cannot be thrown in a rotating mode.
At present, the maximum torque of a rotary drilling machine in the world is 793KN.m, the weight of a maximum drill rod-720 matched with the rotary drilling machine is 40t, the maximum weight of a drill bit is limited not to exceed 40t, and the rotary drilling machine is required to reduce the weight of the drill bit as much as possible while meeting the lifting force of the drilling machine and overcoming the difficulty of rotary locking of the drilling machine.
The maximum width of the land transport vehicle is 3m, the maximum load is about 29t (minus the dead weight of the vehicle body), and how to solve the transport problem is a big problem of the drill design.
Preventing hole deviation, i.e., how to center and guide, during drilling is an important part of the design of the ultra-large diameter drill bit.
Along with the rapid development of economy in China, the construction scale is continuously increased, the construction grade is gradually improved, the structural form design is changed day by day, the requirement on the bearing capacity of a pile foundation in engineering design such as electric power, traffic and urban construction is higher and higher, the diameter and the burial depth of the pile foundation are larger and larger, and the pile foundation is developedMeasurement of
The design of the pile foundation with the ultra-large diameter.
Along with the high-speed development of urban construction, a large number of large-size, large-span and ultrahigh-height buildings emerge in dense urban space areas in succession, and the buildings often have the characteristics of overlarge-diameter rock-socketed pile foundations, large pile lengths and large rock-entering depths; in addition, the method is also limited by factors such as the existing building foundation at the periphery, subway tunnels (docking stations) and the like, and has strict limiting requirements on pile driving vibration, blasting and underground water level change. How to complete the construction of the large-diameter socketed pile on the original site on the premise of ensuring the environmental protection and safe civilized construction becomes a technical difficulty to be solved urgently.
Before the construction problem of the cast-in-place pile with the ultra-large diameter, exploration and attempt are carried out at home and abroad, and a plurality of successful cases are obtained, wherein the processes adopted at present at home are as follows:
(1) the positive circulation process is used for pore forming, namely, a positive circulation submersible drilling machine is used for carrying out graded drilling, as shown in figure 2, slurry or water enters from a drill rod 8 and drilling slag carrying drill cuttings flows out from a well mouth of a pile hole 9;
(2) drilling holes by reverse circulation, and drilling holes by grading drilling by using a reverse circulation process, as shown in figure 1;
(3) manually digging holes and blasting;
(4) a large-diameter steel pipe pile vibrating hammer pile sinking process;
due to the fact that no ultra-large-diameter rotary drilling bit capable of being matched with a rotary drilling rig is available, the rotary drilling process cannot be applied to the field of construction of the ultra-large-diameter cast-in-place pile all the time.
However, the prior art has the following disadvantages:
(1) the defects of the positive circulation process for pore forming are as follows: 1. the sectional area of the pile hole is large, so that the drilling resistance in the drilling process is large; 2. because the drilling slag discharge amount is large, when the mud retaining wall is adopted to drill in a forward circulation mode to form a hole, the mud in the pile hole of the extra-large-diameter drilling cast-in-place pile has a slow rising speed, and if the mud index is controlled improperly or the emptying is not thorough, the thickness of the sediment at the bottom of the hole is easy to be overlarge; 3. because the self-standing stability of the hole wall of the ultra-large diameter cast-in-situ bored pile is relatively poor, the phenomenon of hole wall collapse is easy to occur.
(2) The disadvantages of reverse circulation drilling are as follows: 1. the drill bit central pipe is easy to block due to larger broken stones; 2. because multistage reaming is needed, the drill is easy to be held when the stage reaming is started; 3. the cutter is easy to wear because the crushing area is too large.
(3) The defects of manual hole digging and blasting are as follows: 1. because large-area pile holes are excavated, the stability of a soil body in the pile hole forming process is difficult to ensure; 2. because the explosion disturbs the stratum too much, the negative effects are caused to the surrounding buildings and the living environment, and the method is not suitable for popularization and application.
(4) The vibrating hammer pile sinking process has the following defects: 1. the steel pipe pile with the ultra-large diameter has large weight, so that the large-scale piling and hoisting equipment capacity is required on site, and the cost is high; 2. the process is that the vibration sinking into the ground has larger resistance, so the process cannot be suitable for hard formation.
Therefore, it is desirable to provide a fan blade type ultra-large diameter rotary drilling bit to solve the above problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a drill bit is dug soon to fan blade type super large diameter, the maximum diameter of increase drill bit body solves the present difficult problem of digging the technology soon and being unable to be applied to super large diameter bored concrete pile construction field by the drill bit restriction, widens the application market who digs the rig soon.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides a fan blade type ultra-large diameter rotary drilling bit, which comprises a bit body, wherein the bit body comprises a central body, the bottom of the central body is provided with a cutting disc, and the top of the central body is provided with a connecting side for connecting a drill rod; the reaming wings are arranged and evenly distributed on the side wall of the central body, and the bottoms of the reaming wings are higher than the bottom of the central body; toothed plates are arranged at the bottoms of the reaming wings and the cutting disc.
Preferably, an upper disc is arranged above the central body, an upper rib plate is arranged above the upper disc, the bottom of the upper rib plate is connected with the upper disc, and the inner side of the upper rib plate is connected with the side wall of the connecting part.
Preferably, the upper rib plates are arranged on both sides of the connecting side, and the upper rib plates on both sides of the connecting side are symmetrically arranged; two upper rib plates are arranged on two sides of the connecting side, and the two upper rib plates on each side are arranged in a V shape.
Preferably, the toothed plate is an integral toothed plate, the toothed plate at the bottom of the cutting disc is in a conical arrangement, and the toothed plate at the bottom of the reaming wing is horizontally arranged.
Preferably, the toothed plate is provided with a plurality of cutting teeth.
Preferably, two reaming wings are arranged, and the two reaming wings are symmetrically arranged on two sides of the central body; the two reaming wings are perpendicular to the upper disc.
Preferably, the reaming wings are arranged separately from the central body, and the reaming wings are welded with the central body during construction; and a reinforcing rib plate is additionally welded above the hole expansion wing.
Preferably, the diameter of the central body is 3500mm, and the diameter of the drill bit body is 5800 mm.
Preferably, the bit body is advanced with the central body before drilling.
The utility model discloses following beneficial technological effect has been gained for prior art:
(1) the drill bit body adopts a fan-shaped structure, the drill bit can be lifted to the position above the mast in the construction process to be operated, and the problem that the maximum diameter of a drilled hole is limited by the distance between the center of the drill rod and the mast for a long time is solved.
(2) No matter the centre body or the reaming wing all designs whole pinion rack, for full section breakage, reduced the drilling resistance among the drilling process.
(3) When drilling in a single-pass mode, the rotary drilling rig reversely rotates to close the bottom door of the central body, so that slag can be carried in a lifting mode, and circulating sludge discharge is not needed.
(4) The center body is subjected to advanced pilot in the drilling process, and the phenomenon of drilling deviated holes can not occur.
(5) The diameter of the central body can reach 3500mm, multi-stage reaming is not needed, drilling accidents cannot occur, and the drilling time is shortened.
(6) The mud retaining wall can be used in the drilling process, the stability of the pile hole soil body is strong, and the disturbance to the stratum is small.
(7) The rotary excavating construction process does not need the capability of large-scale piling and hoisting equipment on site, and is low in cost.
(8) The cutting tool is provided with cutting teeth, so that a harder rock stratum can be drilled, and the stratum applicability is strong.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a reverse circulation drilling process in the prior art;
FIG. 2 is a schematic diagram of a prior art forward circulation drilling process;
FIG. 3 is a schematic illustration of a prior art drill rig illustrating a maximum borehole diameter;
FIG. 4 is a schematic structural view of the vane-type ultra-large diameter rotary drilling bit of the present invention;
FIG. 5 is a front view of the vane type ultra-large diameter rotary drilling bit of the present invention;
FIG. 6 is a top view of the vane type ultra-large diameter rotary drilling bit of the present invention;
FIG. 7 is a first schematic view of the connection of the central body and the upper tray of the present invention;
FIG. 8 is a second schematic view of the connection of the central body and the upper tray of the present invention;
FIG. 9 is a front view of the central body and upper plate of the present invention connected together;
FIG. 10 is a side view of the connection of the central body and the upper plate of the present invention;
FIG. 11 is a top view of the central body and upper tray connection of the present invention;
FIG. 12 is a schematic view of the center body lead of the present invention;
wherein, 1, a connecting party; 2. a rib plate is arranged; 3. hanging the plate; 4. a central body; 5. a cutting disk; 6. reaming wings; 7. reinforcing rib plates; 8. a drill stem; 9. pile hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a drill bit is dug soon to fan blade type super large diameter, the maximum diameter of increase drill bit body solves the present difficult problem of digging the technology soon and being unable to be applied to super large diameter bored concrete pile construction field by the drill bit restriction, widens the application market who digs the rig soon.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 4-12, the present embodiment provides a fan-blade type ultra-large diameter rotary drilling bit, which includes a bit body, the bit body includes a central body 4, a cutting disc 5 is disposed at the bottom of the central body 4, and a connection block 1 is disposed at the top of the central body 4 and used for connecting a drill rod; the reaming wings 6 are arranged, the reaming wings 6 are uniformly distributed on the side wall of the central body 4 in the circumferential direction, and the bottoms of the reaming wings 6 are higher than the bottom of the central body 4; toothed plates are arranged at the bottoms of the reaming wings 6 and the cutting disc 5.
In this embodiment, an upper tray 3 is disposed above the central body 4, an upper rib 2 is disposed above the upper tray 3, the bottom of the upper rib 2 is connected to the upper tray 3, the inner side of the upper rib 2 is connected to the side wall 1 of the connection part, and the outer side extends along the upper tray 3. Specifically, both sides of the connecting side 1 are provided with two upper rib plates 2, the upper rib plates 2 on both sides of the connecting side 1 are symmetrically arranged, and the two upper rib plates 2 on each side are arranged in a V shape.
In this embodiment, the toothed plate is an integral toothed plate, the toothed plate at the bottom of the cutting disc 5 is arranged in a conical shape, and the toothed plate at the bottom of the reaming wing 6 is arranged horizontally; the toothed plate is provided with a plurality of cutting teeth.
In the present embodiment, two reaming wings 6 are preferably provided, and the two reaming wings 6 are symmetrically arranged on both sides of the central body; the two reaming wings 6 are arranged vertically to the upper disc 3 to form a fan-like structure; the traditional rotary drilling bit has a circular section, so that the maximum diameter of a drilled hole is limited by the distance between the center of a drill rod and the mast for a long time.
In the embodiment, the reaming wings 6 and the central body 4 are arranged separately, so that the transportation is convenient, and the central body 4 and the upper disc 3 can be combined for transportation; after being transported to a construction site, the reaming wings 6 are welded with the central body 4, and reinforcing rib plates 7 are additionally welded above the reaming wings 6.
In this embodiment, the diameter of the central body 4 is 3500mm and the diameter of the drill body is 5800 mm.
In the embodiment, the drill bit body is subjected to center body advanced pilot before drilling, so that drilling deviation is avoided, and drilling resistance is reduced;
specifically, as shown in fig. 12, during the construction, D1 diameter drilling construction is first performed using a drill of a conventional structure (the maximum drillable hole diameter is currently the maximum drillable hole diameter)
) Then, the drill bit body of the embodiment is put into the drill bit body to carry out D2 diameter drilling construction (the diameter of D2 can reach
) Design H2>H1 (the lead length can be adjusted according to the diameter D2, DThe larger the 2 is, the smaller the advanced ruler of H2 is suggested to be), the advanced part directly enters the drilled hole after construction, thus when the hole expanding construction is carried out, the concentric drilled hole can be ensured, the drilling is uniform strip-shaped crushing, the drilling resistance is reduced, and the verticality of the drilled hole is ensured.
In this embodiment, during single-pass drilling, the rotary drilling rig rotates reversely, the bottom door of the central body 4 is closed, and slag can be carried by lifting the rotary drilling rig up without circulating slurry for slag discharge.
Specifically, the bottom of the central body 4 is provided with a double-layer bottom plate, namely an upper bottom plate and a lower bottom plate, the upper bottom plate is fixedly welded with the barrel of the central body 4, the lower bottom plate is connected with the upper bottom plate through a central shaft, the upper bottom plate and the lower bottom plate are both provided with soil inlets, during normal drilling, the soil inlets of the upper bottom plate and the lower bottom plate are superposed, drilling residues enter a drill bit from the soil inlets, after the drilling is completed, the drilling machine rotates reversely to drive the upper bottom plate and the lower bottom plate to be staggered, the lower bottom plate is limited by a limiting block, the soil inlets of the upper bottom plate can be just plugged, and the slag carrying function is completed.
The utility model discloses fan blade type super large diameter digs the drill bit soon, will dig the maximum diameter of drill bit soon and increase to 5800mm from present 3500mm, further perfect dig construction process soon, solve present dig the difficult problem that the process was unable to be applied to super large diameter bored concrete pile construction field soon by the drill bit restriction, widen the application market of digging the rig soon, provide a low cost, short period, high-quality construction process for the society, contribute to the economic construction of china.
It should be noted that, as is obvious to a person skilled in the art, the invention is not limited to details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (9)
1. A fan blade type rotary drilling bit with an ultra-large diameter comprises a bit body, wherein the bit body comprises a central body, a cutting disc is arranged at the bottom of the central body, and a connecting part is arranged at the top of the central body and used for connecting a drill rod; the method is characterized in that: the reaming wings are arranged and evenly distributed on the side wall of the central body, and the bottoms of the reaming wings are higher than the bottom of the central body; toothed plates are arranged at the bottoms of the reaming wings and the cutting disc.
2. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 1, characterized in that: an upper disc is arranged above the central body, an upper rib plate is arranged above the upper disc, the bottom of the upper rib plate is connected with the upper disc, and the inner side of the upper rib plate is connected with the side wall of the connecting part.
3. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 2, characterized in that: the upper rib plates are arranged on two sides of the connecting side, and the upper rib plates on the two sides of the connecting side are symmetrically arranged; two upper rib plates are arranged on two sides of the connecting side, and the two upper rib plates on each side are arranged in a V shape.
4. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 1, characterized in that: the pinion rack is whole pinion rack, cutting dish bottom the pinion rack is the toper setting, reaming wing bottom the pinion rack level sets up.
5. The fan blade type ultra-large diameter rotary drilling bit according to claim 1 or 4, characterized in that: the toothed plate is provided with a plurality of cutting teeth.
6. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 2, characterized in that: the number of the reaming wings is two, and the two reaming wings are symmetrically arranged on two sides of the central body; the two reaming wings are perpendicular to the upper disc.
7. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 6, characterized in that: the reaming wings are arranged separately from the central body and are welded with the central body during construction; and a reinforcing rib plate is additionally welded above the hole expansion wing.
8. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 1, characterized in that: the diameter of the central body is 3500mm, and the diameter of the drill bit body is 5800 mm.
9. The fan-blade type ultra-large-diameter rotary drilling bit according to claim 1, characterized in that: the drill body is advanced with the central body before drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120108501.7U CN214145376U (en) | 2021-01-15 | 2021-01-15 | Fan blade type super-large-diameter rotary drilling bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120108501.7U CN214145376U (en) | 2021-01-15 | 2021-01-15 | Fan blade type super-large-diameter rotary drilling bit |
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| Publication Number | Publication Date |
|---|---|
| CN214145376U true CN214145376U (en) | 2021-09-07 |
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ID=77548028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120108501.7U Active CN214145376U (en) | 2021-01-15 | 2021-01-15 | Fan blade type super-large-diameter rotary drilling bit |
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| Country | Link |
|---|---|
| CN (1) | CN214145376U (en) |
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2021
- 2021-01-15 CN CN202120108501.7U patent/CN214145376U/en active Active
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