CN106351214A - Construction method of long spiral variable diameter concrete pile - Google Patents
Construction method of long spiral variable diameter concrete pile Download PDFInfo
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- CN106351214A CN106351214A CN201610741635.6A CN201610741635A CN106351214A CN 106351214 A CN106351214 A CN 106351214A CN 201610741635 A CN201610741635 A CN 201610741635A CN 106351214 A CN106351214 A CN 106351214A
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- reaming
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- 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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a construction method of long spiral variable diameter concrete pile, comprising the construction using the non rock rooted long spiral super-fluid reaming bit, and hole boring, ream drilling and bottom enlarging construction on pile positions as required by the design; and then the concrete pump is opened, injecting the super-fluid concrete with pressure and lift the drill pipe with continuous guncreting to keep the concrete pumped into the borehole greater than the volume lifted up by the drill pipe; fix the reinforcement cage at the design elevation on the top of pile. The construction method can realize concrete grouting without lifting up the drill pipe, finish drilling, reaming and ream drilling at one time, and greatly reduce the engineering cost and environmental pollution with good pile quality and high working efficiency, having a good social and economic benefit.
Description
Technical field
The invention belongs to construction engineering technical field is and in particular to a kind of long spire variable diameters cast-with-pressure concrete pile construction party
Method, can realize the cast-in-place superfluidity coagulations such as repeatedly expanding or base expanding and base expanding according to stratum bearing capacity condition in pile body, stake bottom any part
Native shaped pile.The construction method of the present invention is applicable to compared with the Soft Ground of high-bearing capacity eigenvalue with compared with high-bearing capacity
Pile foundation construction.
Background technology
Environmental protection, abnormal shape, high-bearing capacity are the development trends of pile foundation and construction method now, and to pile foundation on weak soil ground
The application that base process, Composite foundation construction, slope retaining are administered produces material impact.Long spire superfluidity cast-in-situ bored pile is with it
Speed of application is fast, quality is good, pollution-free the features such as more and more adopted by engineering circles.Reaming, ream drilling technology are to improve list
The important means of pile bearing capacity, but traditional reaming, ream drilling technology are only applicable to the underwater cast-in-place pile of mechanical hole building, and
Pore-forming, base expanding and base expanding need secondary just can complete, not only speed of application is slow, and is also easy to produce undergauge, collapse hole, underwater grouting broken pile, bottom hole
Sediment is exceeded to wait quality accident, and mud emission amount is big simultaneously, seriously polluted.Therefore, need exploitation one kind badly can once complete to bore
Hole pile work and pile quality is good, efficiency high concrete pile construction method.
Content of the invention
The problem existing for prior art, the present invention provides a kind of long spire variable diameters cast-with-pressure concrete pile construction party
Method.The technical scheme is that
A kind of long spire variable diameters guncreting pile construction method, including the long spire superfluidity reaming bit using non-embedding rock
Construction, holes at stake position according to design requirement, reaming is crept into and carried out base expanding and base expanding construction；It is then turned on concrete pump, pressure injection surpasses
Chutable concrete, carries brill in pressure injection, remains that concrete pumps into amount of concrete in hole and above carries volume more than drilling rod；By steel
Muscle cage is fixed on design of pile top absolute altitude.
In above-mentioned construction method, the long spire superfluidity reaming bit of described non-embedding rock is coaxial Double-pillar hollow-core construction,
Internal layer column structure internal diameter is identical with drilling rod internal diameter, and outer layer column structure is double acting hollow piston hydraulic cylinder, and adopts double cropping
With hollow piston hydraulic cylinder inner wall tube as bit central pipe, realize not proposing brill concrete perfusion operation；And described drill bit two
Side is the reaming wing plate installing cutting tooth, and cutting tooth is used for down-cutting foundation soil, and reaming wing plate is arranged on reaming hinge and props up
On support hinge, reaming wing plate is used for lateral compression ground and makes reducing section stable, and reaming hinge and supporting hinges composition cut with scissors
Chain mechanism, controls the flexible of double acting hollow hydraulic cylinder piston top by control system of rig, by controlling linkage
Realize the boring of reaming wing plate, reaming and the ream drilling process of cutting tooth.
In above-mentioned construction method, the counter bore diameter allowable error of described reaming drilling is -0.1 times of counter bore diameter, and -0.1
Times counter bore diameter≤5cm；Reducing reaming should enter good soil layer in vertical direction and be no less than 0.5m；Base expanding and base expanding position allows vertical
Direction adjusts 0.5～1.0m up and down.
In above-mentioned construction method, described carry brill in pressure injection put forward brill speed controlling in 2.0 ~ 2.5m/min, and drilling rod
Lifting is not more than 30cm.
The invention has the benefit that the present invention can realize not proposing brill concrete perfusion operation, can once complete to bore
Hole, reaming and ream drilling work, and pile quality is good, efficiency high, significantly reduces construction costs and environmental pollution, has
Good Social and economic benef@.
Brief description
Fig. 1 is a kind of flow chart of long spire variable diameters guncreting pile construction method of the present invention.
Fig. 2 is a kind of non-embedding rock long spire superfluidity of long spire variable diameters guncreting pile construction method of the present invention
Reaming bit bore state figure；
Fig. 3 is a kind of non-embedding rock long spire superfluidity reaming of long spire variable diameters guncreting pile construction method of the present invention
Drill bit reaming state diagram；
In Fig. 2 and Fig. 3,1- adpting flange, 2- abrasion-proof helical blade, 3- double acting hollow piston hydraulic cylinder, 4- double acting is hollow
Hydraulic cylinder piston comes directly towards, 5- bit central pipe, 6- reaming hinge, 7- reaming wing plate, 8- supporting hinges, 9- cutting tooth, and 10- is easy
Change bottom side overhead door, 11- bottom cone palm piece.
Fig. 4 is the long spire variable diameters cast-with-pressure concrete pile detail drawing of the present invention.
Fig. 5 is the long spire variable diameters cast-with-pressure concrete pile profile of the present invention, and wherein (a) presses for long spire variable diameters and fill
The longitudinal sectional drawing of concrete-pile；B () is the sectional view in (a) in figure 1-1 face.
Specific embodiment
With specific embodiment, the present invention is described in further details below in conjunction with the accompanying drawings, described is the solution to the present invention
Release rather than limit.
By a kind of long spire variable diameters guncreting pile construction method of the present invention be applied to prototype pile foundation test drilling,
Pile and detection, its partial data is shown in Table 1.
As shown in Figure 4 and Figure 5, the mattress layer of the thick 0.3m of stake top laying of described long spire variable diameters cast-with-pressure concrete pile
(blinding layer), pile body concrete adopts c30 Superfluid state concrete to irrigate, pile body diameter and length be respectively as follows: diameter d=0.4m,
L=8.0m, configures 5 hrb335 18 cage bars, using tie hoop hpb235 6@200, stirrup encryption at stake top, variable diameters,
Away from for 100mm；The pile body reaming of argillic horizon, diameter is respectively d=0.4m, 0.6m, 0.7m, 0.8m, 0.9m.Test site is taken off
The stratum showing is respectively the argillic horizon of thickness 2m and the coarse sands layer of thickness 8m from top to bottom.The severe of argillic horizon is 19.5kn m-3, modulus of compressibility is 15mpa, and Poisson's ratio is 0.35, and cohesion is 20kpa, and Nei Mocha angle is 10 °；The severe of coarse sands layer is
20kn·m-3, modulus of compressibility is 40mpa, and Poisson's ratio is 0.3, and cohesion is 1kpa, and Nei Mocha angle is 40 °.
Described long spire variable diameters guncreting pile construction method, process chart is as shown in figure 1, Specific construction step
It is:
(1) preparation of construction
Purchase material by design requirement, checking and accepting is carried out to the model of material, specification, quantity, quality, checks product certificate
Book, samples by specification and rechecks；
After levelling of the land, carry out pipes investigation, remove the barrier within 2 meters of construction site below ground, then leveling, rammer
Real；Reasonable Arrangement construction machinery, transfer pipeline and power circuit position are it is ensured that " three supplies and one leveling " of construction site；
Using power be 110kw, drill pipe diameter be 400mm izd800 rig, hbt80 type concrete pump, and debug to
Normal operation；Described rig adopts the long spire superfluidity reaming bit of non-embedding rock, and described drill bit is the hollow knot of coaxial Double-pillar
Structure, internal layer column structure internal diameter is identical with drilling rod internal diameter, and outer layer column structure is double acting hollow piston hydraulic cylinder 3, and adopts
Double acting hollow piston hydraulic cylinder inner wall tube, as bit central pipe 5, is realized not proposing brill concrete perfusion operation；And described brill
Head both sides are the reaming wing plate 7 installing cutting tooth 9, and cutting tooth is used for down-cutting foundation soil, and reaming wing plate 7 is arranged on reaming hinge
On chain 6 and supporting hinges 8, reaming wing plate is used for lateral compression ground and makes reducing section stable, reaming hinge and bloster hinge
Chain forms linkage, controls the flexible of double acting hollow hydraulic cylinder piston top 4 by control system of rig, by controlling
Linkage realizes the boring of reaming wing plate, reaming and the ream drilling process of cutting tooth；Fig. 2 and Fig. 3 each provides described
The bore state figure of non-embedding rock long spire superfluidity reaming bit and reaming state diagram；
Laying coarse sand, layered rolling, mattress layer thickness is 0.3m, mattress layer upper surface absolute altitude+0.3m；
(2) the construction line-putting and rig are in place
Before construction, introduce measurement control point from original measurement basic point to construction site, measure long spire variable diameters with total powerstation
The measurement control point of cast-with-pressure concrete pile, discharges stake point bit line；Through repetition measurement test line qualified after, laid on the spot with steel ruler and survey line
Stake position is it is ensured that stake holes center shift variance is less than 50mm；
Rig is in place, makes rig supporting ＆ stablizing, behind align piles site must leveling it is ensured that the perpendicularity of pore-forming；
Set stake top absolute altitude as relative elevation (± 0.000), using nts-355s total powerstation (5 " level), certainty of measurement ± (3mm
+ 2ppm d), measures stake mouth absolute altitude, according to Design of Foundation drawing and geologic prospect report, determines stake boring counterbore depth
For -2.5m, stake drilling total depth 8m；
(3) make steel reinforcement cage, prepare Superfluid state concrete
The entering of reinforcing steel bar should be by " metal stretching experimental technique " (gb/t228 2002), " steel and the sampling of product made from steel mechanical property test
Position and sample preparation " (gb/t2975 1998), the regulation of " bend test of metal materials method " (gb/t232 2010) enter
Row yield point, tensile strength, elongation and cold bending test；Reinforcing bar must be divided by different steel grades, grade, the trade mark, specification and factory
Criticize and check and accept, store up respectively, and board should be found and be easy to identify；Fabrication of reinforcing cage adopts long line method unified making, steel on pedestal mold
Muscle cage saves long 8m, 5 hrb335 18 of steel reinforcement cage cage bar substantially, and hpb235 6 stirrup adopts spiral wound, and cage bar sets every 2m
Put stirrup of putting more energy into (hpb235 12) and fix cage bar, cage bar is connected suitable spot welding with stirrup；Fabrication of reinforcing cage is to bar gauge, welding rod
Specification, kind, fusion length, weld appearance quality, cage bar and stirrup manufacturing deviation etc. are checked；Steel reinforcement cage cage bar with put more energy into
Stirrup must weld, the preferably inside lateral bend 15～30 of cage bar at the 500mm of steel reinforcement cage lower end, and steel reinforcement cage tolerance is as follows: diameter
± 10mm, length ± 100mm, cage bar spacing ± 10mm, stirrup spacing ± 20mm；
C30 Superfluid state concrete selects portland cement, and strength grade is 32.5 mpa, and the ratio of mud is 0.58, slump 23
Cm, when mixing feeds intake, it is dosed order and preferably lags behind water and cement, stone, sand coarse aggregate ratio 44%, and it is every that pile concrete must leave test block
Individual cast machine-team cannot be less than 1 group, every group 3；
(4) draw a little in place, reducing reaming and boring
After rig is in place, stake position is carried out with repetition measurement, firm rig, by the long spire of horizon rule and the non-embedding rock of plumb bob double-direction control
Superfluidity reaming bit center and drilling rod perpendicularity, carry out leveling, centering, the perpendicularity of adjustment stake machine, deviation should to stake machine
Within 10mm, borehole perpendicularity error ＜ 0.3%, control linkage and reaming wing plate to open (as shown in Figure 3)；Verification is bored
Pole length it is ensured that drilling depth accurate；Far from ground 10～20cm, align piles position, in press-in soil, in work progress for drilling rod lower end
Require the cleaning hole side dregs in rotary drill rod, fallen into soil block when preventing from lifting drilling rod, boring procedure total powerstation corrects
Perpendicularity (≤1%), holes at stake position according to design requirement and reaming is to projected depth -2.5m；Then control linkage and
Reaming wing plate is retracted, and continues construction pile body downwards and locates to -8m, stops rig；
In pile body reaming work progress, should conscientiously observe the change of hydralic pressure gauge, the gauge pressure of itemized record each reducing reaming position
Value and reducing reaming, base expanding and base expanding time, -0.1 times of counter bore diameter of counter bore diameter allowable error, and -0.1 times of counter bore diameter≤5cm.Become
Footpath reaming should enter good soil layer in vertical direction and be no less than 0.5m；Base expanding and base expanding position allow in the vertical direction under adjustment 0.5～
1.0m；
(5) pore-forming perfusion
Start hbt80 type concrete pump and start pressure injection Superfluid state concrete, carry brill in pressure injection, drilling rod lifting is not more than
30cm, controls drilling rod lifting speed (2.0 ~ 2.5m/min), remains that pumping into amount of concrete in hole above puies forward volume more than drilling rod
Amount, calculate every dish pumping enter concrete square amount (often 0.44 cubic metre of disk), during construction, by concrete pumping drilling rod is produced upper
Top power, adjustment carries drilling speed degree it is ensured that drilling rod and blade have certain squeezing action to concrete；
(6) lay steel reinforcement cage
For preventing steel reinforcement cage deformation during lifting, attached steel pipe (along the elongated arrangement of cage bar, spacing is 1.5 meters) should be tied up in steel reinforcement cage bottom,
Provide suspension hook for oneself using rig steel reinforcement cage is vertically sling, above aperture, under then helping steady rotation dependence to conduct oneself with dignity and be artificial
Enter in hole, decentralization steel reinforcement cage should be put down gently, slow play, if be hampered hindering, should ascertain the reason, being processed；Can be in termination with counterweight
Vibrator vibration press-in, and monitor stake top absolute altitude；After steel reinforcement cage enters hole, it is positioned to accurately, fixing firm, its median-plane location
Deviation is not more than 20mm, skeleton top elevation ± 20mm.
The embodiment of the present invention is to a kind of pile foundation of long spire variable diameters guncreting pile construction method (as Fig. 4 and Fig. 5
Shown) carry out vertical bearing capacity test, with pile body diameter in argillic horizon from 400mm equal-diameter pile, reaming to pile body diameter
The non-uniform pile of 600mm, 700mm, 800mm, 900mm, the vertical limit load respectively 447.58kn of pile foundation,
508.17kn, 557.99kn, 561.31kn, 585.30kn, the corresponding displacement at pile top of vertical limit load respectively 6.95mm,
7.05mm、7.00mm、6.06mm、5.88mm.
Analyze (see Table 1) from ULTIMATE LOAD OF SINGLE PILE, after viscous soil horizon pile foundation plinth reaming, pile foundation ultimate load is in integrally
Now improve trend, when counter bore diameter is in 700 ~ 800mm, pile foundation is close to large-diameter pile foundation boundary diameter, the limit of stake
Bearing capacity increasing degree is less, shows end resistance and the collateral resistance relaxation phenomenon that similar stake end embeds closely knit foundation soil, 800mm
The ultimate load increasing degree of later stake increases, but less than medium-small diameter pile foundation expanding after ultimate load increment.?
Displacement at pile top aspect, the reaming with stake footpath in viscous soil horizon increases, and displacement at pile top integrally presents the trend of being gradually reduced.Viscous
In property soil layer, after pile foundation reaming, reaming pile body increases the compression depth to bottom dense sand stratum so that 700mm reaming is straight
Pile foundation settling amount within footpath is increased slightly, but increasing degree is less by 0.72% ~ 1.44%；Thereafter, with the increasing of counter bore diameter
Plus, displacement at pile top during ultimate load has more apparent reduction.Concrete data is shown in Table 1.
The ultimate bearing capacity of table 1 long spire variable diameters cast-with-pressure concrete pile and displacement at pile top
Claims (4)
1. a kind of long spire variable diameters guncreting pile construction method is it is characterised in that include surpassing using the long spire of non-embedding rock
Fluidised form reaming bit is constructed, and is holed at stake position according to design requirement, reaming is crept into and carried out base expanding and base expanding construction；It is then turned on coagulation
Native pump, pressure injection Superfluid state concrete, carry brill in pressure injection, remain that concrete pumps into amount of concrete in hole and above carries more than drilling rod
Volume；Steel reinforcement cage is fixed on designed elevation.
2. a kind of long spire variable diameters guncreting pile construction method according to claim 1 is it is characterised in that described
The long spire superfluidity reaming bit of non-embedding rock is coaxial Double-pillar hollow-core construction, internal layer column structure internal diameter and drilling rod internal diameter phase
With, outer layer column structure is double acting hollow piston hydraulic cylinder, and using double acting hollow piston hydraulic cylinder inner wall tube as brill
Head central canal, realizes not proposing brill concrete perfusion operation；And described drill bit both sides are the reaming wing plate installing cutting tooth, cutting
Tooth is used for down-cutting foundation soil, and reaming wing plate is arranged on reaming hinge and supporting hinges, and reaming wing plate is used for laterally squeezing
Pressure ground simultaneously makes reducing section stable, and reaming hinge and supporting hinges form linkage, are controlled double by control system of rig
Act on the flexible of hollow hydraulic cylinder piston top, realize the boring of the reaming wing plate of cutting tooth, expansion by controlling linkage
Hole and ream drilling process.
3. a kind of long spire variable diameters guncreting pile construction method according to claim 1 is it is characterised in that described
The counter bore diameter allowable error of reaming drilling is -0.1 times of counter bore diameter, and -0.1 times of counter bore diameter≤5cm；Reducing reaming is perpendicular
Nogata is no less than 0.5m to entering good soil layer；Base expanding and base expanding position allows to adjust 0.5～1.0m under in the vertical direction.
4. a kind of long spire variable diameters guncreting pile construction method according to claim 1 is it is characterised in that described
In pressure injection, carrying of drilling process bores speed controlling in 2.0 ~ 2.5m/min, and drilling rod lifting is not more than 30cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610741635.6A CN106351214A (en) | 2016-08-29 | 2016-08-29 | Construction method of long spiral variable diameter concrete pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610741635.6A CN106351214A (en) | 2016-08-29 | 2016-08-29 | Construction method of long spiral variable diameter concrete pile |
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| Publication Number | Publication Date |
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| CN106351214A true CN106351214A (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610741635.6A Pending CN106351214A (en) | 2016-08-29 | 2016-08-29 | Construction method of long spiral variable diameter concrete pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313730A (en) * | 2017-08-11 | 2017-11-03 | 朱龙 | One kind fetches earth Screw Pile drilling tool and Screw Pile |
| CN114541372A (en) * | 2022-03-25 | 2022-05-27 | 刘帅 | Soil-squeezing pore-forming and pile-forming method for screw pile |
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| CN1814915A (en) * | 2006-02-24 | 2006-08-09 | 翟向滨 | Apparatus and method for long spiral-drilling enlarging-base agitation and reaming-in-hole concrete filling to form pile |
| CN103089146A (en) * | 2013-01-23 | 2013-05-08 | 阎慧奎 | Engineering driller capable of conducting superfluid concrete grouting pile driving construction on hard rock strata |
| CN103510510A (en) * | 2013-10-22 | 2014-01-15 | 山东鸿顺集团有限公司 | Reinforced long spiral drilling concrete grouting pile and construction method thereof |
| CN104250970A (en) * | 2013-06-27 | 2014-12-31 | 上海城地建设股份有限公司 | Novel visual intelligent super-fluid cast-in-place concrete pile device and construction method |
| CN204225771U (en) * | 2014-10-24 | 2015-03-25 | 中冶沈勘工程技术有限公司 | The embedding rock reaming bit of long auger guncreting pile |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814915A (en) * | 2006-02-24 | 2006-08-09 | 翟向滨 | Apparatus and method for long spiral-drilling enlarging-base agitation and reaming-in-hole concrete filling to form pile |
| CN103089146A (en) * | 2013-01-23 | 2013-05-08 | 阎慧奎 | Engineering driller capable of conducting superfluid concrete grouting pile driving construction on hard rock strata |
| CN104250970A (en) * | 2013-06-27 | 2014-12-31 | 上海城地建设股份有限公司 | Novel visual intelligent super-fluid cast-in-place concrete pile device and construction method |
| CN103510510A (en) * | 2013-10-22 | 2014-01-15 | 山东鸿顺集团有限公司 | Reinforced long spiral drilling concrete grouting pile and construction method thereof |
| CN204225771U (en) * | 2014-10-24 | 2015-03-25 | 中冶沈勘工程技术有限公司 | The embedding rock reaming bit of long auger guncreting pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313730A (en) * | 2017-08-11 | 2017-11-03 | 朱龙 | One kind fetches earth Screw Pile drilling tool and Screw Pile |
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| CN114541372A (en) * | 2022-03-25 | 2022-05-27 | 刘帅 | Soil-squeezing pore-forming and pile-forming method for screw pile |
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