CN107339069A - Drilling method for mechanical drilling pile - Google Patents
Drilling method for mechanical drilling pile Download PDFInfo
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- CN107339069A CN107339069A CN201710479041.7A CN201710479041A CN107339069A CN 107339069 A CN107339069 A CN 107339069A CN 201710479041 A CN201710479041 A CN 201710479041A CN 107339069 A CN107339069 A CN 107339069A
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- China
- Prior art keywords
- diameter
- drilling
- pile
- bit
- stake
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Classifications
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling method of a mechanical drilling pile, and belongs to the technical field of civil construction piling. The method comprises the following steps: firstly, selecting drill bits with at least three sizes according to the diameter of a pile hole in actual construction; and secondly, sequentially drilling the pile forming sites according to the sequence of the diameters of the drill bits from small to large, wherein the drilling depth is the actually designed hole depth each time until the diameter of the formed hole is the same as the diameter of the actually designed pile hole. The pore-forming resistance in the construction process can be reduced.
Description
Technical field
The present invention relates to civil construction piling technology field, more particularly to a kind of boring method of machine drilling stake.
Background technology
Application No. 201510485561.X patent of invention, disclose a kind of drilling construction side of three-stage club-footed pile
Method.
Civil construction be unable to do without pile foundation, and earthward lower drilling is needed before forming pile foundation.Existing boring method is three
Segmentation play, i.e., hole is divided into three sections along its length and carries out drilling construction respectively.
But when being more than 1.5 meters of timber pile footpath to stake footpath, such as：
Stake footpath Φ 2.2m, designing pile length 98m pile foundation, its actual hole depth is 108m.
In punching to 90m position, dash forward and meet compared with hard formation, impact drill due in hole slip consistency it is big, chopping bit is under
The resistance run into during pendant impact reduces kinetic energy, occurs inhaling and bores phenomenon, easily bit freezing.Time-parallel strata is to impact drill rebound effect
Strengthen, impact drill drilling depth effect has been had a greatly reduced quality, and drilling depth is very slow.
Finally, the hole depth that impact drill is replaced with to this last 18m of clean-out machine solution is taken at scene.
But this method pore-forming, it is necessary in boring procedure backfill after continue to drill, add construction duration.Because
The stake holes of 108 meters of depths, need to pour as early as possible after pore-forming.Otherwise, as the increase of engineering time, the risk of collapse hole can increase.Ten thousand
One there is collapse hole, and intractability can be increasing, and working sources and fund input also can be more, cause unnecessary waste.
The content of the invention
It is an object of the invention to provide a kind of boring method of machine drilling stake, reduces the pore-forming resistance in work progress
Power.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of boring method of machine drilling stake,
The first step, the drill bit of at least three kinds sizes is chosen according to the stake holes diameter of practice of construction；
Second step, pile place is drilled successively according to the order of bit diameter from small to large, and drilling depth is every time
The hole depth of actual design, until the diameter of pore-forming is identical with actual design stake holes diameter.
By using above-mentioned technical proposal, the depth for needing pore-forming is first drilled into less than the drill bit of drilling diameter with diameter dimension
Degree.Smaller due to boring footpath, pore-forming resistance diminishes in boring procedure, runs into harder rock stratum and is more easy to punch, runs into sticky mud
Caused resistance is small, is not susceptible to inhale and bores phenomenon.Then reaming, each reaming are carried out using the bigger drill bit of diameter again
When be both less than the resistance of one-step pore-creating in face of resistance caused by drill bit.So drilling depth progress is accelerated, and in this method
In without carrying out backfill processing to stake holes, the pore-forming duration is substantially reduced, so as to reduce the risk that pore-forming caves in.
Further set：When choosing bit diameter size, the minimum bit diameter of selection is no more than 1.5 meters.
By using above-mentioned technical proposal, according to practical construction experience, when stake holes diameter is less than 1.5 meters, it is not susceptible to
The phenomenon that drill bit drops, so the bit diameter of drilling is no more than 1.5 meters for the first time.
Further set：It is no more than 0.5 meter per the adjacent bit diameter difference to drill twice.
Because follow-up drill process, constructed on the basis of previous step pore-forming by using above-mentioned technical proposal,
And drill bit and contact area of ground are bigger, then pore-forming resistance is bigger.So in this programme between every adjacent drill bit to drill twice
Difference is no more than 0.5 meter, and the pore-forming resistance in subsequent step is reduced, penetration rate during so as to accelerate drilling.
In summary, the invention has the advantages that：
1st, because in boring procedure, bit diameter is smaller, and resistance is smaller caused by pore-forming, more the geology easily against complexity
Situation is drilled.And now the penetration rate of pore-forming is fast, it is more easy to be drilled into designed elevation.
2nd, in follow-up reaming, bit size becomes big, but the real contact area between ground diminishes, pore-forming resistance
Power diminishes, and runs into harder rock stratum and is not susceptible to inhale brill phenomenon.So that drill bit is not easy to drop, without time-consuming salvaging, so as to shorten
Duration, and reduce the risk that pore-forming caves in.
Brief description of the drawings
Fig. 1 is the drill bit FEM model for representing Φ 1.5m；
Fig. 2 is the force analysis of drill bit when the FEM model based on Fig. 1 carries out simulating actual probing.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment 1：
Stake footpath Φ 2.2m, designing pile length 98m pile foundation, its actual hole depth is 108m.
The first step, first it is drilled into design stake bottom absolute altitude with Φ 1.5m bradawl；
Second step, the middle drill bit that extraction drilling rod is replaced with Φ 1.8m are drilled into designed elevation；
3rd step, it is replaced with and is drilled into designed elevation with design stake footpath size identical Φ 2.2m big drill bit.
The calculating analysis of first step bit size：
Using GF-400 model clean-out machines, point three steps are excavated, the first stage excavates whether ability directly determines three-step approach
It is feasible.Main-shaft torque 42000N.m, first step bit profile diameter 1.5m, therefore be converted into single-point horizontal loading and be：
42000/0.75/1000=56KN.Because geological condition is complicated at drill bit, 4 of simulating contact are also difficult to using theoretical model
Blade thin portion stressing conditions, and it is also inaccurate.Therefore can be passed through by the way that drill hole geologic counter-force is put on into drill bit to simulate
Bending, shearing, the ratio coefficient of axial action and ultimate load judge reasonability that the drill bit first step is excavated.
With reference to Fig. 1 and Fig. 2, in unit coordinate system z-axis direction, the section calculated using moment M y, cross-section data Czp, Czm
Stress, output be absolute value in two values higher value.Maximum is 57.6MPa, less than allowable stress 145MPa, subitem
Ratio safety coefficient：145/57.6=2.5.Therefore no matter material or safety coefficient disclosure satisfy that requirement to the drill bit.
Bit force situation analysis table
To sum up, the first step uses diameter 1.5m drill bits, is fully able to meet requirement, fact proved that the first step is excavated also very
Smoothly.
Embodiment 2：
Stake footpath Φ 2.4m, designing pile length 104m pile foundation, its actual hole depth is 114m.
The first step, first it is drilled into design stake bottom absolute altitude with Φ 1.4m bradawl；
Second step, the middle drill bit that extraction drilling rod is replaced with Φ 1.8m are drilled into designed elevation；
3rd step, drilling rod takes out and is replaced with Φ 2.1m drill bit be drilled into designed elevation；
4th step, it is replaced with and is drilled into designed elevation with design stake footpath size identical Φ 2.4m big drill bit.
Embodiment 3：
Stake footpath Φ 2.0m, designing pile length 90m pile foundation, its actual hole depth is 100m.
The first step, first it is drilled into design stake bottom absolute altitude with Φ 1.3m bradawl；
Second step, the middle drill bit that extraction drilling rod is replaced with Φ 1.6m are drilled into designed elevation；
3rd step, it is replaced with and is drilled into designed elevation with design stake footpath size identical Φ 2.0m big drill bit.
The above embodiments are only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Claims (3)
- A kind of 1. boring method of machine drilling stake, it is characterised in that：The first step, the drill bit of at least three kinds sizes is chosen according to the stake holes diameter of practice of construction；Second step, pile place is drilled successively according to the order of bit diameter from small to large, and drilling depth is every time The hole depth of actual design, until the diameter of pore-forming is identical with actual design stake holes diameter.
- 2. the boring method of machine drilling stake according to claim 1, it is characterised in that：Choosing bit diameter size When, the minimum bit diameter of selection is no more than 1.5 meters.
- 3. the boring method of machine drilling stake according to claim 2, it is characterised in that：Per the adjacent drill bit to drill twice Diameter difference is no more than 0.5 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479041.7A CN107339069A (en) | 2017-06-22 | 2017-06-22 | Drilling method for mechanical drilling pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479041.7A CN107339069A (en) | 2017-06-22 | 2017-06-22 | Drilling method for mechanical drilling pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107339069A true CN107339069A (en) | 2017-11-10 |
Family
ID=60221105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710479041.7A Pending CN107339069A (en) | 2017-06-22 | 2017-06-22 | Drilling method for mechanical drilling pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107339069A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902939A (en) * | 1996-06-04 | 1999-05-11 | U.S. Army Corps Of Engineers As Represented By The Secretary Of The Army | Penetrometer sampler system for subsurface spectral analysis of contaminated media |
| CN103195365A (en) * | 2013-03-29 | 2013-07-10 | 徐州徐工基础工程机械有限公司 | Rotary drilling rig hard rock stratum step drilling construction process |
| CN104047543A (en) * | 2014-05-30 | 2014-09-17 | 中铁隧道集团有限公司 | Construction method for forming hole by large-diameter bored pile in high-strength rock stratum |
| CN104074458A (en) * | 2014-06-25 | 2014-10-01 | 中铁上海工程局集团有限公司 | Drilled pile graded casing drilling perforating method |
| CN106168024A (en) * | 2015-05-19 | 2016-11-30 | 五冶集团上海有限公司 | A drilling construction method is dug in special formation rotation |
-
2017
- 2017-06-22 CN CN201710479041.7A patent/CN107339069A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902939A (en) * | 1996-06-04 | 1999-05-11 | U.S. Army Corps Of Engineers As Represented By The Secretary Of The Army | Penetrometer sampler system for subsurface spectral analysis of contaminated media |
| CN103195365A (en) * | 2013-03-29 | 2013-07-10 | 徐州徐工基础工程机械有限公司 | Rotary drilling rig hard rock stratum step drilling construction process |
| CN104047543A (en) * | 2014-05-30 | 2014-09-17 | 中铁隧道集团有限公司 | Construction method for forming hole by large-diameter bored pile in high-strength rock stratum |
| CN104074458A (en) * | 2014-06-25 | 2014-10-01 | 中铁上海工程局集团有限公司 | Drilled pile graded casing drilling perforating method |
| CN106168024A (en) * | 2015-05-19 | 2016-11-30 | 五冶集团上海有限公司 | A drilling construction method is dug in special formation rotation |
Non-Patent Citations (1)
| Title |
|---|
| 杜永昌: "《铁路工程施工装备选型配套手册 （1）》", 28 February 2011, 中国铁道出版社 * |
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| PB01 | Publication | ||
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Application publication date: 20171110 |