CN210033290U

CN210033290U - Rotary drilling bit for drilling of rotary drilling bored pile

Info

Publication number: CN210033290U
Application number: CN201920619077.5U
Authority: CN
Inventors: 夏建国; 朱亚静; 金勤胜; 姚院峰; 董治军; 王永忠; 刘雄军; 程伟; 颜阳
Original assignee: Wuhan Nanfang Geotechnical Engineering Technology Co Ltd; China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Current assignee: Wuhan Nanfang Geotechnical Engineering Technology Co Ltd; China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-02-07
Anticipated expiration: 2029-04-30

Abstract

The utility model relates to a dig bored concrete pile soon and creep into with digging the drill bit soon. The drill bit comprises a square head, wherein a barrel is fixedly arranged at the lower end of the square head, a welding barrel is arranged at the lower end of the barrel, one side of the barrel is connected with the welding barrel through a connecting pin, and an opening and closing mechanism is arranged between the inside of the other side of the barrel and the welding barrel; the lower end of the welding cylinder is symmetrically provided with two cutting toothed plates, and the front edges of the tail ends of the two cutting toothed plates are provided with cutting teeth; the barrel is internally and fixedly provided with a ventilation duct, the upper end of the ventilation duct extends out of the top of the barrel, and the lower end of the ventilation duct extends out of the bottom of the welding barrel and is provided with a closed switch. The utility model combines the conventional sand bailing bucket with the two-petal bucket, adopts the two-petal cutting structure, and can improve the drilling efficiency of the drill bit on the loose and easily collapsed layer; through setting up the pipe of ventilating, effectively reduce and carry the possibility that produces vacuum negative pressure below the drill bit in-process, avoid the pore wall to collapse.

Description

Rotary drilling bit for drilling of rotary drilling bored pile

Technical Field

The utility model relates to a drill bit especially relates to a dig bored concrete pile soon and creep into with digging the drill bit soon.

Background

With the rapid development of national economy, China has huge market demands in the construction field of the industries such as traffic, electric power and municipal engineering, and the construction of environment-friendly pile foundation engineering by adopting a rotary drilling rig becomes an unprecedented construction technology. In the actual rotary drilling and pore forming process, the local soil filling layer, the sand layer, the gravel layer and the like are seriously expanded or collapsed, the pore-forming quality is low, the concrete filling coefficient is overlarge, and the engineering benefit is seriously influenced.

In order to reduce the concrete filling coefficient of the rotary drilling bored concrete pile, the slurry performance, the construction process and the rotary drilling bit can be adjusted and improved. In the aspect of rotary drilling of the drill bit, the drill bit is various, and common drill bit types comprise a sand scooping hopper, a two-petal hopper, a cylindrical drill, an auger bit and the like. When the type of the drill bit is not suitable for the drilled stratum, the drilling efficiency is low, the probability of scraping the hole wall by the drill bit is increased, and the phenomena of hole wall collapse and pile hole diameter expansion are caused. Because the annular flow area between the drill bit and the hole wall is too small, the drill bit is easy to form a piston effect in the drill lifting process, so that a vacuum negative pressure area is generated at the bottom of the hole, and the hole wall collapses.

Chinese patent CN208633798U discloses a double-bottom sand scoop, which comprises a barrel body, wherein a balance pipe is fixedly arranged on one side of the top of the barrel body away from the balance pipe, an opening and closing mechanism is arranged on one side of the top of the barrel body away from the balance pipe, a pin shaft is fixedly arranged on one side of the bottom of the barrel body away from the opening and closing mechanism, a bottom plate is rotatably connected to the pin shaft, and a cutting disc is arranged below the bottom plate. The cutting disc can be rotated to drill into the silt through the rotatable cutting disc, and the opening and closing mechanism can be used for enabling the barrel body to rotate around the pin shaft, so that the cutting disc can be opened and closed at a certain angle. The drill bit is easy to form a 'piston' effect in the process of lifting the drill bit, and the hole wall can be collapsed.

Disclosure of Invention

For solving the above problem, the utility model provides a dig bored concrete pile soon and creep into with digging the drill bit soon, adopt this drill bit when the stratum that loosens and easily collapse creeps into, can improve the drilling efficiency of drill bit to avoid carrying the brill in-process to produce the vacuum negative pressure zone bottom the drill bit, cause the pore wall to collapse.

The utility model adopts the technical proposal that: the utility model provides a dig bored concrete pile soon and creep into with digging drill bit soon which characterized in that: the rotary drilling rig comprises a square head connected with the lower end of a drill rod of a rotary drilling rig, wherein a barrel is fixedly arranged at the lower end of the square head, a welding barrel is arranged at the lower end of the barrel, one side of the barrel is connected with the welding barrel through a connecting pin, and an opening and closing mechanism is arranged between the inside of the other side of the barrel and the welding barrel; the lower end of the welding cylinder is symmetrically provided with two cutting toothed plates, and the front edges of the tail ends of the two cutting toothed plates are provided with cutting teeth; and an air duct is fixedly arranged in the cylinder, the upper end of the air duct extends out of the top of the cylinder, and the lower end of the air duct extends out of the bottom of the welding cylinder and is provided with a closing switch.

Preferably, a plurality of upper gauge guards are uniformly arranged on the outer circular wall of the cylinder body.

Furthermore, the cylinder is conical with a wide upper part and a narrow lower part, and the cone angle is 3-10 degrees.

Preferably, a plurality of lower gauge guards are uniformly arranged on the outer circular wall of the welding cylinder.

Preferably, a supporting plate is fixedly arranged between the cutting tooth plate and the welding cylinder.

The utility model discloses the beneficial effect who gains is: the utility model combines the conventional sand bailing bucket with the two-petal bucket, adopts the two-petal cutting structure, and can improve the drilling efficiency of the drill bit on the loose and easily collapsed layer; through setting up the pipe of ventilating, effectively reduce and carry the possibility that produces vacuum negative pressure below the drill bit in-process, avoid the pore wall to collapse.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIGS. 2-3 are cross-sectional views in different directions of FIG. 1;

reference numeral 1, a cylinder; 2. a square head; 3. keeping the diameter; 4. an opening and closing mechanism; 5. an airway tube; 6. closing the switch; 7. a connecting pin; 8. cutting a toothed plate; 9. cutting teeth; 10. welding the cylinder; 11. a support plate; 12. and (5) maintaining the diameter.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in figures 1-3, the utility model discloses a dig bored concrete pile soon and creep into with digging the drill bit soon, including upper portion drag for sand fill, lower part cutting structure, ventilation structure, mechanism and connecting pin 7 etc. several parts open and shut.

The upper sand bailing bucket comprises a cylinder body 1, a square head 2 and an upper gauge 3, wherein the cylinder body 1 is conical (the upper part is wide and the lower part is narrow), the cone angle is 3-10 degrees, the annular flow area of the rotary drilling bit is increased, and the slag soil in the cylinder is easier to discharge; the square head 2 is fixed above the barrel 1 and used for connecting the rotary drilling bit with a drill rod of a rotary drilling rig; the upper gauge 3 is uniformly arranged on the outer circular wall of the cylinder body 1 and used for protecting the cylinder body 1 from being abraded by hole wall rock soil and keeping the drill bit centered to a certain extent.

The lower cutting structure comprises cutting toothed plates 8, cutting teeth 9, a welding cylinder 10 and a supporting plate 11, wherein the two cutting toothed plates 8 are symmetrically fixed at the lower end of the welding cylinder 10 in a welding mode; the front end edge of the cutting toothed plate 8 is provided with cutting teeth 9; a supporting plate 11 is welded between the cutting toothed plate 8 and the welding cylinder 10 and used for enhancing the fixing strength between the cutting toothed plate and the welding cylinder; the inclination angle of the cutting toothed plate 8 can be adjusted according to the drilled stratum, and the number and shape of the cutting teeth 9 can also be adjusted according to the drilled stratum; in addition, the thickness of the welding cylinder 10 is slightly larger than the steel thickness of the cylinder body 1, a plurality of lower gauge 12 are uniformly arranged on the outer wall of the welding cylinder 10, and the number and the shape of the lower gauge 12 can be adjusted as required.

1 one side of barrel is connected with a welding section of thick bamboo 10 through connecting pin 7, is equipped with the mechanism of opening and shutting 4 between 1 opposite side inside and the welding section of thick bamboo 10 of barrel, and the mechanism of opening and shutting 4 is the same with the structure and the principle that conventional sand was fought, and the drill bit is bored the in-process down, and the mechanism of opening and shutting 4 can be so that a welding section of thick bamboo 10 rotates along connecting pin 7 to the cutting teeth 9 on lower extreme cutting pinion rack 8 realizes opening and shutting of certain angle, improves drilling efficiency.

The ventilation structure is fixed in the cylinder body 1 and consists of a ventilation catheter 5 and a closed switch 6. The ventilation pipe 5 is fixed in the cylinder body 1, the upper end of the ventilation pipe extends out of the top of the cylinder body 1, the lower end of the ventilation pipe extends out of the bottom of the welding cylinder 10 and is provided with a closing switch 6, the closing switch 6 is similar to a floor drain switch and is in a closing state in the process of drilling down and normal drilling, and the ventilation pipe 5 is in an opening state under the action of water pressure in the ventilation pipe 5 in the process of drilling lifting, so that a channel is provided for fluid on the upper portion of the drill bit. In addition, the venting structure should not interfere with the opening and closing operation of the lower cutting structure.

The foregoing shows and describes the general principles and principal structural features of the invention. The present invention is not limited by the above-mentioned examples, and the present invention can be modified in various ways without departing from the spirit and scope of the present invention, and these modifications and improvements fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a dig bored concrete pile soon and creep into with digging drill bit soon which characterized in that: the drilling machine drilling rod welding device comprises a square head (2) connected with the lower end of a drilling rod of a rotary drilling rig, wherein a barrel body (1) is fixedly arranged at the lower end of the square head (2), a welding barrel (10) is arranged at the lower end of the barrel body (1), one side of the barrel body (1) is connected with the welding barrel (10) through a connecting pin, and an opening and closing mechanism (4) is arranged between the inner part of the other side of the barrel body (1) and the welding barrel (10); the lower end of the welding cylinder (10) is symmetrically provided with two cutting toothed plates (8), and the front edges of the tail ends of the two cutting toothed plates (8) are provided with cutting teeth (9); the barrel (1) is internally and fixedly provided with an air duct (5), the upper end of the air duct (5) extends out of the top of the barrel (1), and the lower end of the air duct extends out of the bottom of the welding barrel (10) and is provided with a closed switch (6).

2. The rotary drill bit for drilling the rotary drilling bored concrete pile according to claim 1, characterized in that: a plurality of upper gauge guards (3) are uniformly arranged on the outer circular wall of the cylinder body (1).

3. The rotary drill bit for drilling the rotary drilling bored concrete pile according to claim 2, characterized in that: the cylinder body (1) is conical with a wide upper part and a narrow lower part, and the cone angle is 3-10 degrees.

4. The rotary drill bit for drilling the rotary drilling bored concrete pile according to claim 1, characterized in that: a plurality of lower gauge guards (12) are uniformly arranged on the outer circular wall of the welding cylinder (10).

5. The rotary drill bit for drilling the rotary drilling bored concrete pile according to claim 1, characterized in that: and a supporting plate (11) is fixedly arranged between the cutting toothed plate (8) and the welding cylinder (10).