CN110258546A - A kind of Double shaft stirring drill bit of achievable two-way stirring - Google Patents
A kind of Double shaft stirring drill bit of achievable two-way stirring Download PDFInfo
- Publication number
- CN110258546A CN110258546A CN201910681520.6A CN201910681520A CN110258546A CN 110258546 A CN110258546 A CN 110258546A CN 201910681520 A CN201910681520 A CN 201910681520A CN 110258546 A CN110258546 A CN 110258546A
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- Prior art keywords
- stirring
- gear
- level
- drill bit
- blade
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- 238000003756 stirring Methods 0.000 title claims abstract description 109
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims description 20
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 6
- 239000004568 cement Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 208000009146 rhinoscleroma Diseases 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of Double shaft stirring drill bits of achievable two-way stirring, belong to underground engineering pile foundation construction apparatus field, including drilling rod, drill bit, level-one master stirs blade, second level master stirs blade, connecting bracket, driving gear, connection gear, driven gear, bores tooth, fixed link, connecting shaft, follower lever, bearing；By being welded to connect, the connecting bracket is connect with follower lever by bearing for the connecting bracket and drilling rod；The driving gear and connection gear are by connection axis connection, and driving gear is by driving driven gear to drive and changing the direction of rotation of connection gear；It is attached between the driving gear and drilling rod using welding, is attached between the connection gear and drilling rod using welding, the driven gear and follower lever pass through welded connecting.Invention achieves resistance in going down process, is reduced, slurry amount, slurries and the more uniform purpose of soil shear failure are returned in reduction.
Description
Technical field
The present invention relates to underground engineering pile foundation construction apparatus fields, are related specifically to a kind of twin shaft of achievable two-way stirring
Stir drill bit.
Background technique
Cement mixing method is a kind of method for reinforcing saturation Soft Clay Foundation, it using cement as curing agent,
It is produced in ground depths by weak soil and curing agent action of forced stirring using between curing agent and weak soil by special Mixing Machine
Raw a series of physical chemical reaction, makes weak soil scleroma at the high-quality ground with globality, water stability and some strength.Water
There are the construction equipments such as single shaft, twin shaft, three axis in soil mixing pile, different construction equipments is selected according to different geological conditions again
And construction method.Stirring-head is the important component of deep mixer, it directly affects the deep layer that cement slurry and weak soil are mixed to form
The pile body uniformity of mixing pile, determines the consolidation effect of ground.
Currently, cement mixing method is primarily present following defect: (1) being deposited to the bad adaptability on stratum, such as coastal region
On more soft or hard staggeredly stratum, compared with hard formation, construction efficiency is low, at high cost；Compared with soft formation, particularly with highly plastic clay,
Bonding drill bit phenomenon is serious, and pile quality not can guarantee at all.(2) ejection medium (cement slurry either flour) and soil layer
Stirring is uneven, and design requirement is not achieved, influences pile strength.(3) equipment damage is serious, and deep-mixing pile driver is in dense sand stratum
To the abrasion of drill bit than more serious when middle drilling.Therefore, stirring-head generates biggish shadow to the pile quality of cement mixing method
It rings, is based on this, the present invention proposes a kind of Double shaft stirring drill bit of achievable two-way stirring.
Summary of the invention
For the above-mentioned technical problems in the prior art, the invention proposes a kind of twin shafts of achievable two-way stirring
Drill bit is stirred, the deficiencies in the prior art are overcome.By the stirring-head rotated in setting double-shaft two-way, to the greatest extent to the soil body
It is disturbed, so that slurries are uniformly mixed with the soil body, by optimizing the position of spout, ensure that cement mixed weight and cement
The mixing uniformity of slurry and soil.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of Double shaft stirring drill bit of achievable two-way stirring, it is characterised in that: stir blade, two including drilling rod, drill bit, level-one master
Grade is main to be stirred blade, connecting bracket, driving gear, connection gear, driven gear, bores tooth, fixed link, connecting shaft, follower lever, axis
It holds；The drilling rod is the hollow cylindrical body of rod, and drilling rod and drill bit, level-one master stir blade, second level master stirs blade and carried out by welding
Connection；By being welded to connect, the connecting bracket is connect with follower lever by bearing for the connecting bracket and drilling rod；The active
Gear and connection gear are by connection axis connection, and driving gear is by driving driven gear to drive and changing connection gear
Direction of rotation；It is attached between the driving gear and drilling rod using welding, is used between the connection gear and drilling rod
Welding is attached；The level-one master stirs blade and is attached with brill tooth by welding.
Preferably, described two connecting brackets are on same waterline, and two connecting brackets are connected by fixed link, and solid
Fixed pole and connecting bracket are high-strength alloy material, and yield strength should be greater than 600MPa.
Preferably, be interspersed between the main stirring blade, the distance between main stirring blade of two of them level-one with
The distance between two main stirring blades of second level are identical, are 100-300mm.
Preferably, the axle center of the connecting shaft and drilling rod is on same vertical line, and the diameter of connecting shaft is drill pipe diameter
1/3-2/3, and the material of connecting shaft is high-strength alloy, and yield strength should be greater than 500MPa.
Preferably, the driving gear and connection gear are high hardness alloy material, driving gear and connection gear
Identical diameter range is 200-300mm, and the driven gear is high hardness alloy material, and the diameter range of driven gear is
145-195mm。
Preferably, the length of the level-one stirring blade is less than second level stirring blade, and the length range shortened is 100-
300mm。
Preferably, the distance between described adjacent brill tooth is 150-300mm, and brill tooth is evenly distributed on level-one master and stirs under blade
Portion, brill tooth material are high-strength alloy, and yield strength should be greater than 500MPa, Brinell hardness range 250-400.
Preferably, the rear portion that second level master stirs blade is provided with slurries spout, spout is tapered.
Advantageous effects brought by the present invention:
(1) the level-one stirring blade is less than second level stirring blade, and in going down process, level-one stirring blade cuts soil first
Body, blade is smaller to be conducive to bore under stirring-head, meanwhile, second level stirring blade is larger, in the laggard of level-one stirring-head disturbed soil
Row is lower to be bored, and lower brill resistance reduces, and stirs more uniform.(2) two stage blade, and the rotation side of two grade blades are provided on stirring-head
To on the contrary, keeping soil disturbance more violent.(3) two agitating shafts are set simultaneously, and are connected with each other two axis by fixed link, two
The interlaced distribution of stirring blade on axis increases soil disturbance range, and is conducive to bore under stirring-head.(4) pass through by
The notch setting of slurries stirs bucket rear in second level master, and the slurries that make that can be more efficient are filled into surrounding soil, and reduce and return slurry
Amount.
Detailed description of the invention
Fig. 1 is the overall structure front view of the Double shaft stirring drill bit of the achievable two-way stirring of the present invention.
Fig. 2 is the cross-sectional view of the structure of the Double shaft stirring drill bit of the achievable two-way stirring of the present invention.
Wherein, 1- drilling rod；2- drill bit；3- level-one master stirs blade；4- second level master stirs blade；5- connecting bracket；6- driving tooth
Wheel；7- connection gear；8- driven gear；9- bores tooth；10- fixed link；11- connecting shaft；12- follower lever；13- bearing.
Specific embodiment
With reference to the accompanying drawing and specific embodiment invention is further described in detail:
Embodiment 1:
Equipment operation test is carried out on miscellaneous fill place, test pile length is 3m, using provided by the invention a kind of achievable
The Double shaft stirring drill bit of two-way stirring, for testing the using effect of mixing pile.
As shown in Figs. 1-2, a kind of Double shaft stirring drill bit of achievable two-way stirring, it is characterised in that: including drilling rod 1, bore
First 2, level-one master stirs blade 3, second level master stirs blade 4, connecting bracket 5, driving gear 6, connection gear 7, driven gear 8, bores tooth
9, fixed link 10, connecting shaft 11, follower lever 12, bearing 13；The drilling rod 1 is the hollow cylindrical body of rod, drilling rod 1 and drill bit 2, one
Grade master stirs blade 3, second level master stirs blade 4 and is attached by welding；The connecting bracket 5 passes through welded connecting, institute with drilling rod 1
It states connecting bracket 5 and is connect with follower lever 12 by bearing 13；The driving gear 6 is connect with connection gear 7 by connecting shaft 11,
And driving gear 6 is by driving driven gear 8 to drive and changing the direction of rotation of connection gear 7；The driving gear 6 with
It is attached, is attached between the connection gear 7 and drilling rod 1 using welding, the driven tooth using welding between drilling rod 1
Wheel 8 passes through welded connecting with follower lever 12；The level-one master stirs blade 3 and is attached with brill tooth 9 by welding.
Preferably, described two connecting brackets 5 are on same waterline, and two connecting brackets 5 are connected by fixed link 10,
And fixed link 10 and connecting bracket 5 are high-strength alloy material, yield strength 700MPa.
Preferably, be interspersed between the main stirring blade, the distance between main stirring blade 3 of two of them level-one with
The distance between the main stirring blade 4 of two second levels is identical, is 300mm.
Preferably, the connecting shaft 11 and the axle center of drilling rod 1 are on same vertical line, and the diameter of connecting shaft 11 is drilling rod
The 2/3 of 1 diameter, and the material of connecting shaft 11 is high-strength alloy, yield strength 600MPa.
Preferably, the driving gear 6 and connection gear 7 are high hardness alloy material, driving gear 6 and connection gear
Identical 7 diameter is 300mm, and the driven gear 8 is high hardness alloy material, and the diameter of driven gear 8 is 195mm.
Preferably, the length of the level-one stirring blade 3 is less than second level stirring blade 4, and the length shortened is 300mm.
Preferably, the distance between described adjacent brill tooth 9 is 300mm, and brill tooth 9 is evenly distributed on level-one master and stirs under blade 3
Portion, brill 9 material of tooth are high-strength alloy, and yield strength should be greater than as 600MPa, Brinell hardness 300.
Preferably, the rear portion that second level master stirs blade 4 is provided with slurries spout, spout is tapered.
Embodiment 2:
On the basis of the above embodiments, equipment operation test is carried out on outdoor sports, test site is cohesive soil, test pile
Length is 5m, using a kind of Double shaft stirring drill bit of achievable two-way stirring provided by the invention, for testing making for mixing pile
Use effect.
As shown in Figs. 1-2, a kind of Double shaft stirring drill bit of achievable two-way stirring, it is characterised in that: including drilling rod 1, bore
First 2, level-one master stirs blade 3, second level master stirs blade 4, connecting bracket 5, driving gear 6, connection gear 7, driven gear 8, bores tooth
9, fixed link 10, connecting shaft 11, follower lever 12, bearing 13；The drilling rod 1 is the hollow cylindrical body of rod, drilling rod 1 and drill bit 2, one
Grade master stirs blade 3, second level master stirs blade 4 and is attached by welding；The connecting bracket 5 passes through welded connecting, institute with drilling rod 1
It states connecting bracket 5 and is connect with follower lever 12 by bearing 13；The driving gear 6 is connect with connection gear 7 by connecting shaft 11,
And driving gear 6 is by driving driven gear 8 to drive and changing the direction of rotation of connection gear 7；The driving gear 6 with
It is attached, is attached between the connection gear 7 and drilling rod 1 using welding, the driven tooth using welding between drilling rod 1
Wheel 8 passes through welded connecting with follower lever 12；The level-one master stirs blade 3 and is attached with brill tooth 9 by welding.
Preferably, described two connecting brackets 5 are on same waterline, and two connecting brackets 5 are connected by fixed link 10,
And fixed link 10 and connecting bracket 5 are high-strength alloy material, yield strength 750MPa.
Preferably, be interspersed between the main stirring blade, the distance between main stirring blade 3 of two of them level-one with
The distance between the main stirring blade 4 of two second levels is identical, is 250mm.
Preferably, the connecting shaft 11 and the axle center of drilling rod 1 are on same vertical line, and the diameter of connecting shaft 11 is drilling rod
The 2/3 of 1 diameter, and the material of connecting shaft 11 is high-strength alloy, yield strength 700MPa.
Preferably, the driving gear 6 and connection gear 7 are high hardness alloy material, driving gear 6 and connection gear
Identical 7 diameter is 300mm, and the driven gear 8 is high hardness alloy material, and the diameter of driven gear 8 is 195mm.
Preferably, the length of the level-one stirring blade 3 is less than second level stirring blade 4, and the length range shortened is
250mm。
Preferably, the distance between described adjacent brill tooth 9 is 200mm, and brill tooth 9 is evenly distributed on level-one master and stirs under blade 3
Portion, brill 9 material of tooth are high-strength alloy, yield strength 700MPa, Brinell hardness range 400.
Preferably, the rear portion that second level master stirs blade 4 is provided with slurries spout, spout is tapered.
It constructs according to above-mentioned steps, test pile is excavated after conserving, experiment effect is significant, and pile body is uniform,
Quality is preferable.
The Double shaft stirring drill bit of two-way stirring can be achieved in the present invention, by the way that twin shaft twin-stage stirring blade is arranged, disturbs the soil body
It is dynamic more violent, and be conducive to bore under stirring-head；And level-one stirring blade is less than second level stirring blade, in going down process, one
Grade stirring blade cutting soil first, blade is smaller to be conducive to bore under stirring-head, meanwhile, second level stirring blade is larger, in level-one
Lower brill is carried out after stirring-head disturbed soil, lower brill resistance reduces, and stirs more uniform.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also belong to guarantor of the invention
Protect range.
Claims (8)
1. a kind of Double shaft stirring drill bit of achievable two-way stirring, it is characterised in that: including drilling rod, drill bit, level-one master stir blade,
Second level master stirs blade, connecting bracket, driving gear, connection gear, driven gear, bores tooth, fixed link, connecting shaft, follower lever, axis
It holds；The drilling rod is the hollow cylindrical body of rod, and drilling rod and drill bit, level-one master stir blade, second level master stirs blade and carried out by welding
Connection；By being welded to connect, the connecting bracket is connect with follower lever by bearing for the connecting bracket and drilling rod；The active
Gear and connection gear are by connection axis connection, and driving gear is by driving driven gear to drive and changing connection gear
Direction of rotation；It is attached between the driving gear and drilling rod using welding, is used between the connection gear and drilling rod
Welding is attached, and the driven gear and follower lever pass through welded connecting；The level-one master, which stirs blade and bores tooth, passes through welding
It is attached.
2. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that described two
Connecting bracket is on same waterline, and two connecting brackets are connected by fixed link, and fixed link is high-strength with connecting bracket
Alloy material, yield strength should be greater than 600MPa.
3. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that the master stirs
It mixes and is interspersed between blade, between the distance between main stirring blade of two of them level-one and two main stirring blades of second level
It is 100-300mm apart from identical.
4. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that the connection
The axle center of axis and drilling rod is on same vertical line, and the diameter of connecting shaft is the 1/3-2/3 of drill pipe diameter, and the material of connecting shaft
For high-strength alloy, yield strength should be greater than 500MPa.
5. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that the active
Gear and connection gear are high hardness alloy material, and driving gear identical as the diameter range of connection gear is 200-
300mm, the driven gear are high hardness alloy material, and the diameter range of driven gear is 145-195mm.
6. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that the level-one
The length of stirring blade is less than second level stirring blade, and the length range shortened is 100-300mm.
7. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that described adjacent
Boring the distance between tooth is 150-300mm, and brill tooth is evenly distributed on level-one master and stirs blade lower part, and brill tooth material is high-strength alloy,
Its yield strength should be greater than 500MPa, Brinell hardness range 250-400.
8. a kind of Double shaft stirring drill bit of achievable two-way stirring according to claim 1, which is characterized in that in second level master
The rear portion for stirring blade is provided with slurries spout, and spout is tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681520.6A CN110258546A (en) | 2019-07-26 | 2019-07-26 | A kind of Double shaft stirring drill bit of achievable two-way stirring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681520.6A CN110258546A (en) | 2019-07-26 | 2019-07-26 | A kind of Double shaft stirring drill bit of achievable two-way stirring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110258546A true CN110258546A (en) | 2019-09-20 |
Family
ID=67911964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910681520.6A Pending CN110258546A (en) | 2019-07-26 | 2019-07-26 | A kind of Double shaft stirring drill bit of achievable two-way stirring |
Country Status (1)
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158158A (en) * | 2007-11-19 | 2008-04-09 | 徐玉杰 | Single-power bidirectional stir head for soft foundation and mixing pile machine having the same |
| CN201459712U (en) * | 2009-05-14 | 2010-05-12 | 徐宏跃 | Single-power bidirectional soil-cement mixing pile mixing device |
| CN203532633U (en) * | 2013-11-12 | 2014-04-09 | 张新强 | Bidirectional transmission device of soil-cement mixing pile machine |
| CN203770542U (en) * | 2014-04-14 | 2014-08-13 | 张善龙 | Single-shaft bidirectional stirring tank |
| CN203905004U (en) * | 2014-06-25 | 2014-10-29 | 黑龙江省龙建路桥第三工程有限公司 | Bidirectional drill bit blade device of deep cement mixing pile machine |
| CN207469226U (en) * | 2017-11-28 | 2018-06-08 | 吴应寿 | The two-way cement mixing pile crown of multiaxis |
| CN207974762U (en) * | 2018-03-14 | 2018-10-16 | 朱登佩 | One kind rely on oneself commutation bi-directional cement soil mixing pile drilling tool |
| CN210507428U (en) * | 2019-07-26 | 2020-05-12 | 北京中岩大地科技股份有限公司 | Double-shaft stirring drill bit capable of realizing bidirectional stirring |
-
2019
- 2019-07-26 CN CN201910681520.6A patent/CN110258546A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158158A (en) * | 2007-11-19 | 2008-04-09 | 徐玉杰 | Single-power bidirectional stir head for soft foundation and mixing pile machine having the same |
| CN201459712U (en) * | 2009-05-14 | 2010-05-12 | 徐宏跃 | Single-power bidirectional soil-cement mixing pile mixing device |
| CN203532633U (en) * | 2013-11-12 | 2014-04-09 | 张新强 | Bidirectional transmission device of soil-cement mixing pile machine |
| CN203770542U (en) * | 2014-04-14 | 2014-08-13 | 张善龙 | Single-shaft bidirectional stirring tank |
| CN203905004U (en) * | 2014-06-25 | 2014-10-29 | 黑龙江省龙建路桥第三工程有限公司 | Bidirectional drill bit blade device of deep cement mixing pile machine |
| CN207469226U (en) * | 2017-11-28 | 2018-06-08 | 吴应寿 | The two-way cement mixing pile crown of multiaxis |
| CN207974762U (en) * | 2018-03-14 | 2018-10-16 | 朱登佩 | One kind rely on oneself commutation bi-directional cement soil mixing pile drilling tool |
| CN210507428U (en) * | 2019-07-26 | 2020-05-12 | 北京中岩大地科技股份有限公司 | Double-shaft stirring drill bit capable of realizing bidirectional stirring |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190920 |