CN109630040A - A kind of novel long screw drill rod and concrete screw thread pile construction method - Google Patents
A kind of novel long screw drill rod and concrete screw thread pile construction method Download PDFInfo
- Publication number
- CN109630040A CN109630040A CN201811501247.6A CN201811501247A CN109630040A CN 109630040 A CN109630040 A CN 109630040A CN 201811501247 A CN201811501247 A CN 201811501247A CN 109630040 A CN109630040 A CN 109630040A
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- CN
- China
- Prior art keywords
- drill rod
- novel long
- long screw
- screw thread
- pile
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- 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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
-
- 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
- E02D5/56—Screw piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0038—Production methods using an auger, i.e. continuous flight type
Abstract
The present invention provides a kind of novel long screw drill rod and concrete screw thread pile construction methods, the rag portion of one section of protrusion helical blade is welded with by the extending direction on the edge of helical blade along helical blade, during long screw drill rod creeps into and punches, the rag portion of protrusion carves thread groove along hole wall in drilling and lifting process, concrete Screw Pile can be thus formed after casting cement, screw thread is embedded in thread groove, compared to traditional cylinder pile, bearing capacity promotes 30~40%, and the bearing capacity of stake is greatly improved.Relative to compacted screw thread (bar) stake machine is rotated, long screw drill rod of the invention rotates rag during drilling and promotion, and soil exports ground, and rag is simple, not will increase the burden of motor, can greatly improve working efficiency, reduces construction cost.
Description
Technical field
The present invention relates to concrete Screw Pile technical field of construction, in particular to a kind of novel long screw drill rod and
Concrete screw thread pile construction method.
Background technique
CFG are that soil is screwed out ground, is perfused at pile top by ground pump pump concrete by rotating elongated helical blade
Concrete formation.At present using commonplace in the projects such as railway, highway, Fang Jian, harbour, airport, power plant.
It rotates (bar) stake of compacted screw thread and drilling rod rotation is driven by big power motor, computer control, using simultaneous techniques, because
It engraves screw thread around concrete-pile, greatlys improve the bearing capacity of stake, patent of invention is by high-volume for height
The engineerings such as are built in iron, room.It is exactly to utilize one currently, there is the compaction thread construction technology of the modest and sincere company's invention in Wuhan in the market
Compacted device, top fills a steel plate blade, and using flywheel technology, when rotating forward is closed, and when reversion opens rag, but in practice,
This technology can not open steel plate in the soil, can not open especially in pan soil, and theory and practice seriously disconnects, thus
In practice, rag truly can not achieve, the stake got cannot form obvious screw thread.
(1) it is unearthed since CFG systems are rotated by elongated helical blade, passes through ground pump pumped concrete earth forming, the stake of formation
For cylinder, the bearing capacity of stake is greatly reduced.
(2) the big compacted screw thread of dynamic rotation (bar) stake system is positive by rotating the dedicated compacted Soil Surrounding of threaded drillpipe
Rotation is lower to bore, and reversely rotates and is promoted, and using simultaneous techniques, realizes that drilling rod is promoted to invert along the original lower screw thread bored and is promoted, together
When pump concrete, formed Screw Pile, the bearing capacity of stake is provided.But also there is disadvantage as follows
(1) computer controls, and needs to put into increase, and a set of computerized control system needs 150,000 yuan, at high cost.
(2) compacted by rotating because pure, mechanical torque is very big, the mechanical torque in order to generate rotation generation, top
Motor power power of motor is larger.Power head is generally with the motor of 2 75KW or 90KW or even 120KW.
(3) because torque is big, rack must be more sturdy, tall and big, thus mechanical overall weight is very big.180 drilling machines
At present by factory, the Shandong Weihai in Shandong province Zhuo Lichang, an equipment of production, weight reaches more than 150 tons.
(4) transport is inconvenient.When entrucking, 17.5 meters of trucies is needed to fill the transport of 5 trolleys, installation, the project amount of lifting are bigger,
(5) speed of production for rotating compaction pile is extremely slow, and it is ten thousand yuan more that an equipment sells 200--300, and the output value only has daily
350 meters or so, thus it is higher to ask a price, construction is slow, and cost performance is low, and benefit is unobvious.
(6) compaction thread machinery is rotated because its weight is too heavy, on soft ground, is easy frame, once frame, all
It is biggish safety accident, first is that mechanical damage is serious, pounds people, can not even more estimate, construction production can not be continued.
(7) simultaneously for areas such as coastal, Shaanxi, 65% is greater than for full water rate, marine facies of the water content greater than 24% are full
And soil, design compaction pile, necking down and the protuberance of stake are easily caused, the compaction pile of some 400mm diameters, meeting necking down is arrived after construction
270mm greatly reduces the bearing capacity of stake, and generation total bearing capacity is inadequate, and the screw thread compaction pile of construction separately changes what scheme was done over again
Designing quality accident.
Summary of the invention
The main purpose of the present invention is to provide a kind of novel long screw drill rod and concrete screw thread pile construction methods, to mention
For a kind of long bolt stake rag drilling rod simple and practical, manufacture construction cost is low, and specific construction method is provided, to manufacture
Strong, the at low cost concrete Screw Pile of bearing capacity out.
To achieve the goals above, the present invention provides a kind of novel long screw drill rods, including drill bit and drilling rod ontology, bore
Head is set to one end of drilling rod ontology, and the helical blade for exporting soil, the edge of helical blade are provided on drilling rod ontology
On the rag portion of one section of protrusion helical blade is welded with along the extending direction of helical blade, when construction, soil passes through helical blade
It is transported on ground, rag portion carves thread groove when boring and promoted under novel long screw drill rod on hole wall.
Further, rag portion is steel plate or reinforcing bar.
Further, rag portion is welded on the helical blade of drill bit.
Further, rag portion is gradually reduced close to one end of drill bit forms tip.
The present invention also provides a kind of concrete screw thread pile construction method, including step S10 to step S40, wherein step
S10: installing novel long screw drill rod on screw rod pile machine, and novel long screw drill rod is above-mentioned novel long screw drill rod；Step
S20: starting the driving motor of screw rod pile machine, and backspin drills, the rag portion of novel long screw drill rod in boring procedure
Thread groove is carved on hole wall；Step S30: when the hole depth in step S20 reaches design requirement, continue to keep driving motor by step
The direction of rapid S20 rotates, and promotes novel long screw drill rod, promotes novel length in the speed and step S20 of novel long screw drill rod
The speed of auger stem backspin is identical；Step S40: concrete grout is carried out in lifting process and is poured, forms concrete after solidification
Screw Pile.
Further, in step s 30, it keeps novel long screw drill rod to rotate up to novel long screw drill rod to be promoted completely
To outside hole.
Further, in step s 30, thread groove runs through entire hole wall, in step s 40, in entire screw thread pile body
It is covered with screw thread.
Further, in step s 30, after lifting process a distance, stop driving motor, and by novel long screw auger
Bar is directly promoted to outside hole.
Further, in step s 30, thread groove is located at the lower part of hole wall, in step s 40, under screw thread pile body
Portion forms screw thread, and the top of screw thread pile body is cylindrical shape.
It applies the technical scheme of the present invention, is welded with by the extending direction on the edge of helical blade along helical blade
The rag portion of one section of protrusion helical blade carves thread groove along hole wall in drilling and lifting process using the rag portion of protrusion,
Concrete Screw Pile can be thus formed after casting cement, screw thread is embedded in soil, compared to traditional cylinder pile, carrying
Power promotes 30~40%, and the bearing capacity of stake is greatly improved.Relative to compacted screw thread (bar) the stake machine of rotation, long screw auger of the invention
Bar rotates rag during drilling and promotion, and soil exports ground, and rag is simple, not will increase the burden of motor, can
Working efficiency is greatly improved, construction cost is reduced.Also, novel long screw auger rod structure of the invention is simple, and it is easy to be changed to, system
It makes at low cost, is worthy of popularization.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of novel long screw drill rod of the invention；
Fig. 2 shows the top views of Fig. 1；
Fig. 3 shows the schematic diagram that the rag portion in Fig. 1 gradually dwindles into tip；
Fig. 4 shows the structural schematic diagram that concrete Screw Pile of the invention is covered with screw thread；
Fig. 5 shows the threaded structural schematic diagram in lower part of concrete Screw Pile of the invention.
Wherein, the above drawings include the following reference numerals:
10, screw thread pile body；20, screw thread；30, drill bit；40, drilling rod ontology；50, helical blade；60, rag portion.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is usually needle
For direction shown in the drawings, or for component itself is on vertical, vertical or gravity direction；Equally
Ground for ease of understanding and describes, and " inside and outside " refers to the inside and outside of the profile relative to each component itself, but the above-mentioned noun of locality is not
For limiting the present invention.
As shown in Figure 1 to Figure 3, novel long screw drill rod includes drill bit 30 and drilling rod ontology 40, and drill bit 30 is set to drilling rod
One end of ontology 40 is provided with the helical blade 50 for exporting soil, edge on the edge of helical blade 50 on drilling rod ontology 40
The extending direction of helical blade 50 is welded with the rag portion 60 of one section of protrusion helical blade 50, and when construction, soil passes through helical-blade
Piece 50 is transported on ground, and rag portion 60 carves thread groove when boring and promoted under novel long screw drill rod on hole wall.
One section of protrusion helical blade is welded with by the extending direction on the edge of helical blade 50 along helical blade 50
50 rag portion 60 carves thread groove along hole wall in drilling and lifting process using the rag portion 60 of protrusion, thus is pouring
Concrete Screw Pile can be formed after cement, screw thread 20 is embedded in soil, and compared to traditional cylinder pile, bearing capacity is promoted
30-40%, the bearing capacity of stake is greatly improved.Relative to compacted screw thread (bar) stake machine is rotated, long screw drill rod of the invention is being bored
Rag is rotated during, soil exports ground, and rag is simple, not will increase the burden of motor, can greatly improve work
Efficiency reduces construction cost.
As shown in Figures 1 to 3, rag portion 60 is steel plate or reinforcing bar, and rag portion 60 is welded in the helical blade close to drill bit 30
On 50, and before welding by steel plate or bar bending at the shape of helical blade.
As shown in figure 3, rag portion 60 is gradually reduced close to one end of drill bit 30 forms tip, to subtract in the process pierced
Few resistance, facilitates rag.
The present invention also provides a kind of concrete screw thread pile construction method, including step S10 to step S40, wherein step
S10: installing novel long screw drill rod on screw rod pile machine, and novel long screw drill rod is above-mentioned novel long screw drill rod；Step
S20: starting the driving motor of screw rod pile machine, and backspin drills, and the rag portion 60 of novel long screw drill rod is in boring procedure
Thread groove is carved on hole wall；Step S30: when the hole depth in step S20 reaches design requirement, continue keep driving motor by
The direction of step S20 rotates, and promotes novel long screw drill rod, promoted the speed of novel long screw drill rod with it is novel in step S20
The speed of long screw drill rod backspin is identical；Step S40: concrete grout is carried out in lifting process and is poured, forms coagulation after solidification
Native Screw Pile.
In step S20, for novel long screw drill rod during lower brill, rag portion 60 is in boring procedure on hole wall
The soil for carving thread groove, but transferring out in the process of ascension can fill up thread groove, thus novel in step S30 promotion
During long screw drill rod, continues that driving motor is kept to rotate by the direction of step S20, promote novel long screw drill rod, mention
The speed for rising novel long screw drill rod is identical as the speed of long screw drill rod backspin novel in step S20, thus in lifting process
It is middle to be taken out of the soil filled out in thread groove using rag portion 60, guarantee the formation of thread groove.
In a kind of construction method, in step s 30, novel long screw drill rod is kept to rotate up to novel long screw drill rod
It being promoted to outside hole completely, thread groove runs through entire hole wall, thus as shown in figure 4, in step s 40 can be in entire screw thread pile body
10 are covered with screw thread 20.
In another construction method, in step s 30, after lifting process a distance, stop driving motor, and will be new
Type long screw drill rod is directly promoted to outside hole, and the soil filled up in the thread groove on hole top at this time is not carried over, thus thread groove
Positioned at the lower part of hole wall, top is circular hole, and then as shown in figure 5, in step s 40, spiral shell is formed at the lower part of screw thread pile body 10
Line 20, the top of screw thread pile body 10 are cylindrical shape.
Using long spire Screw Pile of the present invention, the bearing capacity of CFG (cement fly ash gravel pile) is greatlyd improve, flower is very
Small cost, rag speed is fast, obtains biggish social value.Especially the high-speed rail of investment, Fang Jian, harbour, airport, harbour,
In the projects such as highway engineering, the CFG stake enormous amount used is designed, the CFG stake whole year of whole nation design is as many as 60,000,000-
As many as 9000 myriametres, if being related into CFG Screw Pile, synchronous construction only spends the low cost materials money of screw thread concrete, mechanical the same
Construction, operating, synchronously complete concreting molding, cost only increases the concrete parts of screw thread, 400mm diameter, spiral shell
Line increased costs 8% obtain bearing capacity and increase by 40%, 500mm diameter, and screw thread accounts for increased costs 5%, obtains bearing capacity and increases
30-40%, efficiency ratio is 8 times, if promoted the use of, stake as 1000 myriametres can save 400,000,000 yuan of cost or more.
Calculate as follows: the CFG stake of 400MM diameter, 0.1256 square metre of every section, expending die 1.15-1.18, C20 are mixed
Solidifying soil 300 yuan/M3 of unit price, the concrete 0.1256*1.15*300=43.33 member of 1 linear meter(lin.m.) stake consumption；Average each meter of acquisition
Frictional resistance be thousand Ns of A, the cost ratio B1=43.33/A of investment, unit be member/thousand Ns, if using CFG thread technologies,
Only (0.3 meter of screw pitch, 0.05*0.04 meters of screw thread) 1 meter of long internal screw thread length of stake is (0.32+ (3.14*0.4) under radical sign to cost
2)=1.291 meter, screw thread concrete 1.291*0.05*0.04*300=0.77 member, increased Cost of Concrete 0.77/43.33
=2%, and the increased bearing power increase 30% of CFG screw thread is designed, cost ratio B2=0.77/ (30%A)=2.56/A of investment,
Unit be member/thousand Ns, B2/B1=2.56/43.33=5.91%, benefit improve 16.93 times, if according to Tangshan Fengnan steel
Factory engineering is long according to 15 meters of stakes, and design limit bearing capacity is calculated according to 810KN, that is, the ultimate bearing capacity designed is averaged every linear meter(lin.m.)
54KN, screw thread B2=2.56/54=0.0474 member/KN, 400mm diameter CFG king pile B1=43.33/54=0.8024 member/KN,
1000 myriametre stakes, concrete material take saving 10,000,000 linear meter(lin.m.) * 54* (0.8024-0.0474)=407,700,000 yuan=4.077 hundred million
Member.Considerable benefit.
As can be seen that using CFG Screw Pile, Benefit, the whole nation is promoted, and can save tens hundred million yuan of people every year
Coin.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, work, device, component and/or their combination.
It should be noted that term " includes " and " tool in the description and claims of this application and above-mentioned attached drawing
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of novel long screw drill rod, which is characterized in that including drill bit (30) and drilling rod ontology (40), the drill bit (30) is set
It is placed in one end of the drilling rod ontology (40), the helical blade for exporting soil is provided on the drilling rod ontology (40)
(50), the extending direction on the edge of the helical blade (50) along the helical blade (50) is welded with one section of protrusion spiral shell
The rag portion (60) of vane piece (50), when construction, soil is transported on ground by helical blade (50), the rag portion (60)
Thread groove is carved on hole wall when boring and promoted under the novel long screw drill rod.
2. novel long screw drill rod according to claim 1, which is characterized in that the rag portion (60) is steel plate or steel
Muscle.
3. novel long screw drill rod according to claim 2, which is characterized in that the rag portion (60) is welded in close to institute
It states on the helical blade (50) of drill bit (30).
4. novel long screw drill rod according to claim 2, which is characterized in that the rag portion (60) is close to the drill bit
(30) one end, which gradually reduces, forms tip.
5. a kind of concrete screw thread pile construction method, which is characterized in that including
Step S10: installing novel long screw drill rod on screw rod pile machine, and the novel long screw drill rod is in Claims 1-4
Novel long screw drill rod described in any one；
Step S20: starting the driving motor of the screw rod pile machine, and backspin drills, the rag of the novel long screw drill rod
Portion (60) carves thread groove in boring procedure on hole wall；
Step S30: when the hole depth in the step S20 reaches design requirement, continue to keep the driving motor by the step
The direction of rapid S20 rotates, and promotes the novel long screw drill rod, promotes the speed and the step of the novel long screw drill rod
The speed of novel long screw drill rod backspin described in S20 is identical；
Step S40: concrete grout is carried out in lifting process and is poured, forms concrete Screw Pile after solidification.
6. concrete screw thread pile construction method according to claim 5, which is characterized in that in the step S30, keep
The novel long screw drill rod rotates up to the novel long screw drill rod and is promoted to outside hole completely.
7. concrete screw thread pile construction method according to claim 6, which is characterized in that described in the step S30
Thread groove runs through entire hole wall, and in the step S40, entire screw thread pile body (10) is covered with screw thread (20).
8. concrete screw thread pile construction method according to claim 5, which is characterized in that in the step S30, promoted
After process a distance, stop the driving motor, and the novel long screw drill rod is directly promoted to outside hole.
9. concrete screw thread pile construction method according to claim 8, which is characterized in that described in the step S30
Thread groove is located at the lower part of hole wall, and in the step S40, the lower, outer perimeter of screw thread pile body (10) forms screw thread (20), spiral shell
The top of line pile body (10) is cylindrical shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501247.6A CN109630040A (en) | 2018-12-10 | 2018-12-10 | A kind of novel long screw drill rod and concrete screw thread pile construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501247.6A CN109630040A (en) | 2018-12-10 | 2018-12-10 | A kind of novel long screw drill rod and concrete screw thread pile construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109630040A true CN109630040A (en) | 2019-04-16 |
Family
ID=66072383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811501247.6A Pending CN109630040A (en) | 2018-12-10 | 2018-12-10 | A kind of novel long screw drill rod and concrete screw thread pile construction method |
Country Status (1)
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0253988A1 (en) * | 1986-07-23 | 1988-01-27 | Delmag-Maschinenfabrik Reinhold Dornfeld GmbH & Co. | Prefabricated concrete element and method for introducing such an element to the soil |
| DE102004005967A1 (en) * | 2004-02-06 | 2005-09-08 | Bauer Spezialtiefbau Gmbh | Archimedean screw for placing concrete in ground for construction of vertical walls in ground with mixed-in-place concrete has single spiral fin with cutouts surrounding circular-section tube |
| CN1807769A (en) * | 2006-01-27 | 2006-07-26 | 刘润郊 | Screw pile forming device and forming method |
| CN1851152A (en) * | 2006-05-11 | 2006-10-25 | 黑龙江博施建筑工程技术开发有限公司 | Long-spiral drilling machine screw-thread pile piling device and method |
| KR20100122068A (en) * | 2010-10-19 | 2010-11-19 | 문동춘 | Grouting method using enlarged concrete consolidation grouting apparatus |
| CN204457446U (en) * | 2015-01-09 | 2015-07-08 | 王树仁 | A kind of long auger pressure fills with helical burr ram drill bit |
| CN204532082U (en) * | 2015-01-30 | 2015-08-05 | 刘淼 | A kind of forward becomes spiral shell extruding and expanding drilling tool structure |
-
2018
- 2018-12-10 CN CN201811501247.6A patent/CN109630040A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0253988A1 (en) * | 1986-07-23 | 1988-01-27 | Delmag-Maschinenfabrik Reinhold Dornfeld GmbH & Co. | Prefabricated concrete element and method for introducing such an element to the soil |
| DE102004005967A1 (en) * | 2004-02-06 | 2005-09-08 | Bauer Spezialtiefbau Gmbh | Archimedean screw for placing concrete in ground for construction of vertical walls in ground with mixed-in-place concrete has single spiral fin with cutouts surrounding circular-section tube |
| CN1807769A (en) * | 2006-01-27 | 2006-07-26 | 刘润郊 | Screw pile forming device and forming method |
| CN1851152A (en) * | 2006-05-11 | 2006-10-25 | 黑龙江博施建筑工程技术开发有限公司 | Long-spiral drilling machine screw-thread pile piling device and method |
| KR20100122068A (en) * | 2010-10-19 | 2010-11-19 | 문동춘 | Grouting method using enlarged concrete consolidation grouting apparatus |
| CN204457446U (en) * | 2015-01-09 | 2015-07-08 | 王树仁 | A kind of long auger pressure fills with helical burr ram drill bit |
| CN204532082U (en) * | 2015-01-30 | 2015-08-05 | 刘淼 | A kind of forward becomes spiral shell extruding and expanding drilling tool structure |
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Application publication date: 20190416 |