CN109083181A - Collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique - Google Patents
Collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique Download PDFInfo
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- CN109083181A CN109083181A CN201811112884.4A CN201811112884A CN109083181A CN 109083181 A CN109083181 A CN 109083181A CN 201811112884 A CN201811112884 A CN 201811112884A CN 109083181 A CN109083181 A CN 109083181A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- 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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- 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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Abstract
The present invention provides a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique, belongs to pile foundation churning driven hole creating technology field.Determination including pile foundation churning driven half bore mud wet process pore-forming condition, smooth location bury casing, slurrying, drilling, borehole cleaning, the production of steel reinforcement cage, the installation of steel reinforcement cage, conduit installation and filling concrete.The application half bore mud wet process pore-forming technique top crack cratering develops section using dry method without mud pore-forming, and speed is fast, and drilling bucket squeezes hole wall, increases wall stability；Lower part uses mud off wet process pore-forming, can effectively prevent collapse hole, ensure that speed of fulfiling hole.Mud off effect is good, significant to collapse hole and other effects is reduced, and safety is easy to ensure；It bottom is blown using high pressure water turns over quarrel and direct circulation and adds low-gravity mud or clear water in bottom hole and directly dilute mud and carry out borehole cleaning, the heavy quarrel of bottom hole can be cleaned out, reduce a possibility that heavy quarrel of pile foundation concrete presss from both sides mud, quality is easier to ensure that.
Description
Technical field
The invention belongs to pile foundation rotary digging drilling hole technical field, specially a kind of collapsible loess super long large diameter pile foundation rotary digging
Bore half bore mud wet process pore-forming technique.
Background technique
Since the new century, with the promotion that the people require road-ability, high-grade railway, the design of highway are vertical
Slope etc. is gradually reduced, and High-pier Long-span bridge is more and more, and High-pier Long-span bridge since structure needs, want by the bearing capacity of pile foundation
Ask big.Especially northern China Shaanxi, Gansu province major part geology be collapsible loess, due to collapsible loess soil layer compared with
Thickness, pile side friction are lower, and various is more than that the pile foundation of growing up of 50m is come into being.The characteristics of pile foundation of growing up is pile foundation length, aperture
Greatly, pile lining soil layer is thick, self-stability is poor, and pore-forming, steel reinforcement cage installation, concrete pouring time are long, easily collapses, mud sediment speed is fast, heavy
Shallow lake amount is big, thus difficulty of construction greatly increases, how quickly, safety, economy, environmental protection the long timber pile in completion Collapsible Loess District
The construction of base is always a problem of puzzlement construction.
The construction method of collapsible loess super long large diameter pile foundation will be according to the diameter of pile foundation, length, geology, landform, water
The conditions such as text are comprehensive to be determined, it is crucial that match with the geological conditions of pile foundation.Currently, collapsible loess Transmission of Super-Long Large Diameter
The construction method of pile foundation mainly has rotary digging drilled as holes, impact drilled as holes, circulation drilled as holes etc..
Summary of the invention
It is straight greatly suitable for serious collapsible loess crack cratering development location overlength that the purpose of the present invention is to provide one kind
Diameter pile foundation churning driven half bore mud wet process pore-forming technique, top are quickly drilled without mud using dry method, and compacted pile lining, lower part utilizes
Premium mud retaining wall, rotary digging drilled as holes.
The object of the invention is achieved through the following technical solutions:
A kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique, including pile foundation churning driven
The determination of half bore mud wet process pore-forming condition, smooth location bury casing, and slurrying drills, borehole cleaning, the production of steel reinforcement cage,
The installation of steel reinforcement cage, conduit installation and filling concrete:
The determination of pile foundation churning driven half bore mud wet process pore-forming condition: serious collapsible loess location, soil structure are dredged
The large diameter pile foundation that pine, hole cratering are developed, length is more than 75m, lower part pile foundation water content > 23.5%, 1.8~2.5m of diameter
Using churning driven half bore mud wet process pore-forming；
It is more than the loose hole cratering development of 75m, top pile foundation soil structure to serious collapsible loess location, length, straight
Easily there is collapse hole, spillage problem using dry method or full hole mud wet process pore-forming in the large diameter pile foundation of 1.8~2.5m of diameter, using rotary digging
Half bore mud wet process pore-forming is bored, top half shortens the construction time using dry method pore-forming, and lower half portion uses mud wet process pore-forming
It is safer to be not easy collapse hole, reduces slurrying and processing is more economical.
Smooth location: smooth grinding compacting is carried out to pile foundation construction place, place surrounding excavates intercepting ditch, and place should be formed
One-way or bi-directional draining horizontal slope for being greater than 2%；
Embedded casing: embedded casing length should pass through soft layer and the soil layer that easily collapses, 2 meters of layer slightly close into soil structure, and
It is able to satisfy the extruding for resisting construction loads to pile lining, casing periphery gap is closely knit using clay or mortar filling；
Slurrying: mud pit is arranged at hole number simultaneously according to pile foundation, mud uses bentonite pulping, and mixes burning
Alkali, anti-sloughing agent and sealing agent；In boring procedure, mud balance is controlled in 1.1~1.3t/m3, mud should prepare storage in advance；
Mud pit is set at hole number simultaneously according to pile foundation, mud should prepare storage in advance.Mud uses bentonite pulping,
Incorporation caustic soda, anti-sloughing agent and sealing agent simultaneously add water and stir uniformly, and in boring procedure, mud balance is controlled in 1.1~1.3t/m3,
Bad section of geology uses larger specific gravity, guarantees that pile foundation hole wall surrounding stablizes not collapse hole.
Drilling: original place rotates clockwise aperture when drilling, first creeps at a slow speed, after being drilled into soil layer 1m or less, then is changed to normal
Speed drilling；Pile foundation top half geology is more loose, pores'growth section uses dry method without mud drilling, and rotary drilling-head squeezes repeatedly
Hole wall is pressed, keeps hole wall closely knit；Using the positive drilling of hosqe bit wet process drilling, reversion promotes clear quarrel and immediately for pile foundation lower half portion
Mud is supplemented into hole, should adjust mud prescription and specific gravity according to soil property situation in boring procedure；
Examine hole: stake holes is made a record using intelligence inspection hole instrument detection；
Borehole cleaning: after half bore puddling wet process pore-forming, sediment is cleared up with rotary drilling digger, sediment is proposed outside hole；It is good under conduit
After carry out secondary pile hole cleaning, bottom is blown using high pressure water and turns over quarrel, and take direct circulation bottom hole add low-gravity mud or clear water it is direct
Diluting high-concentration drilling slurry is to 1.1t/m3Below；
The production of steel reinforcement cage: two section steel reinforcement cage main reinforcements of steel reinforcement cage merogenesis machine-shaping, every contiguous concatenation must spell in advance
It is connected into one, is disassembled again after being processed into skeleton, and carries out the label of docking, to splice in aperture；
The installation of steel reinforcement cage: steel reinforcement cage is mechanically connected using sleeve, and lower section steel reinforcement cage in advance pacifies sleeve after being installed
On upper section steel reinforcement cage reinforcing wire mouth, after upper section steel reinforcement cage main reinforcement and the contraposition of lower section steel reinforcement cage main reinforcement, sleeve is reversely revolved
Turn decline, is located at bushing core at steel bar end；
Conduit installation: conduit is connected using silk mouth, single-unit full-length 4m, catheter diameter is not less than 35cm；
Filling concrete: half bore mud wet process pore-forming pile foundation uses catheterized reperfusion concrete piles, should device to hole again before perfusion
Bottom, mud balance are checked；Depth of tremie is not less than 10m during concrete placings, and the stake top absolute altitude of pile foundation of growing up perfusion should compare
Design height is higher by 1.0m or more, when perfusion to stake top absolute altitude, the part reinforcing bar in stake top is entangled using pvc pipe, to protect steel
Muscle is not damaged when cutting pile crown.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the casing be steel pile casting, casing internal diameter is 20cm or more bigger than stake diameter, thickness be not less than 12mm, when
When stake diameter is greater than 2.2m, dual-layer welding is reinforced at the top of casing；The a length of 2m of casing merogenesis section, using digging when shield-tube embedment is shorter
The digging of pick machine is buried, and is buried when longer using churning driven major diameter drill bit brill, and casing periphery gap is closely knit using clay or mortar filling.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the volume of the mud pit is 1.3~1.6 times of pile foundation volume, including volume is pile foundation volume 0.1
One, slurrying pond again, volume are equal with pile foundation volume for 0.2~0.5 times of the pulp storage tank one and volume of pile foundation volume
Sedimentation basin one；The raw material and quality mixture ratio of the mud are water: bentonite: caustic soda: anti-sloughing agent: sealing agent=1:0.1:
0.008:0.001:0.001.Wherein, pile foundation volume is pile foundation volume of the wet process at hole section.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the drilling is greater than 1.15 times of rotary drilling rig, hosqe bit using torque redundancy, and drills
Rate of penetration are as follows: general new loess, crack cratering develop section penetration rate 3m/h, strong yellow soil, ancient soil penetration rate 4~
8m/h；It mentions drilling speed degree: when churning driven reversion is promoted, should control and promote speed in 8m/min.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the borehole cleaning carries out in two stages: the first stage: after drilling to completion, with rotary digging drill bit
Clear up sediment；Second stage: carrying out after good under steel reinforcement cage, conduit, and volume weight of slurry control is in 1.02~1.1t/m after borehole cleaning3。
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the steel reinforcement cage formed using the steel bar meter of 12m length, and reinforced bar sleeve mechanical connection is using rolling
Straight thread；Steel reinforcement cage spreading uses length silk spreading, answers long filament in upper, short silk under；The protective layer of framework of steel reinforcement uses mortar
Annular cushion block.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, after the completion of the reinforcing bar cage hoisting, top hangs muscle of burn-oning is fixed on well-head frame；A most upper section adds
Strengthening tendons carry out reinforcement welding, and reinforce with main reinforcement welding " ┍ " shape muscle.
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, the conduit will carry out examination spelling, waterproof test and connector tensile test before use；Catheter diameter
The needs of concrete pouring speed and concrete back-pressure jacking diffusion diameter must be met, the pile foundation catheter diameter of diameter 2m or more is not less than
35cm。
As a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention,
A specific embodiment, in the filling concrete step, in perfusion to stake top, since hopper to concrete face height difference becomes smaller,
Concrete top surface beds of precipitation thickness thickens, and concrete pouring is difficult, need to dilute the mud of concrete top surface using high pressure water and exclude, and promote hopper
Highly.
A kind of technique of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique of the present invention is former
Reason: serious collapsible loess crack cratering develops location super long large diameter pile foundation churning driven half bore mud wet process drilling construction, on
Using dry method quickly without mud drilling, compacted pile lining, lower part utilizes premium mud retaining wall, rotary digging drilled as holes in portion.For half bore mud
It starches wet process pore-forming mud face and aperture height difference is big, be difficult to meet to want using Pump breath countercirculate or gas lift reverse circulation its pressure
It asks, borehole cleaning blows bottom using high pressure water and turns over quarrel, and direct circulation is taken directly to be diluted in bottom hole admixture low-gravity mud or clear water
1.1t/m3Below.
Compared with prior art, the invention has the following advantages:
1, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction is drilled using churning driven, on
Portion crack cratering develops section using dry method without mud pore-forming, and speed is fast, and drilling bucket squeezes hole wall, increases wall stability；Lower part
Using mud off wet process pore-forming, it can effectively prevent collapse hole, ensure that speed of fulfiling hole.
2, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction bores quarrel and directly utilizes drilling machine
It is proposed hole outside, can be directly transported to by dumper spoil ground stacking, reduce the processing cost of mud, can saving construction cost, reduce
Environmental pollution.
3, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction bores quarrel and directly excavates, and adopts
Bottom is blown with high pressure water and turns over quarrel borehole cleaning, and drilling, borehole cleaning speed are faster than impact drilled as holes, can save the duration.
4, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction, mud off effect is good,
Significant to collapse hole and other effects is reduced, safety is easy to ensure；Bottom is blown using high pressure water and turns over quarrel and direct circulation in bottom hole admixture low-gravity
Mud or clear water directly dilute mud and carry out borehole cleaning, substantially can clean out the heavy quarrel of bottom hole, reduce the heavy quarrel folder mud of pile foundation concrete
A possibility that, quality is easier to ensure that.
5, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction, stake top steel-bar arrangement PVC
Casing protection, ring cutting method are cut, and more can guarantee quality.
6, stake holes more can control verticality, precipitating thickness etc. using intelligence inspection hole instrument detection.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
National Highway Gansu, Yinchuan to Baise sugar water fort to Qingcheng County to Yonghe County section that 23 innings of groups of middle iron undertake the construction of
TYKZ3 marks long 19.615km, completely 28 bridge blocks, wherein all the time gutter grand bridge because stake long (maximum length of pile 96m), pier it is high (most
The big high 163m of pier), across big (maximum span continuous rigid frame 180m) occupy Asia same type bridge second, the duration is tight, and difficulty is big.Completely
It pile foundation 950, is respectively positioned on collapsible loess, is designed as friction pile, individual pier positions are end-bearing pile.For pile foundation geological condition,
Wherein more than 20 root super long large diameter pile foundations use churning driven half bore mud wet process drilling construction, and the maximum long 96m of construction stake is maximum
Construction stake diameter 2.5m, success rate 100%, safety, quality has obtained effective guarantee, and progress is fast, at low cost, save the cost
Hundreds of thousands of members.
To serious collapsible loess location, length be more than the loose hole cratering development of 75m, top pile foundation soil structure, under
Portion pile foundation water content > 23.5%, 1.8~2.5m of diameter large diameter pile foundation use churning driven half bore mud wet process pore-forming, specifically
It operates as follows:
1, smooth location
Pile foundation construction place is bulldozed using bull-dozer, road roller grinding compacting, and place length and width need to meet selection drilling machine model
And transport quarrel vehicle parking and operation width.Place surrounding excavates intercepting ditch, and place should form one-way or bi-directional row for being greater than 2%
Water horizontal slope prevents rainwater etc. from impregnating or flowing into stake holes.
2, casing is buried
Steel pile casting internal diameter is 20cm or more bigger than stake diameter, and thickness is not less than 12mm, double at the top of casing when stake diameter is greater than 2.2m
Layer welding is reinforced.Embedded casing length is determined according to geology, generally should pass through soft layer and easily collapse soil layer and easy collapsible soil layer, into
It is 2 meters of layer slightly close to enter soil structure.And it is computed to be able to satisfy and resists the construction loads such as drilling machine and crane, concrete transportation tank car to pile lining
Extruding is advisable.Casing merogenesis is unsuitable too short, and saving long 2m is advisable.Shield-tube embedment can be buried when shorter using excavator, when longer
It is buried using churning driven major diameter drill bit brill, casing periphery gap is closely knit using clay or mortar filling.
3, slurrying
Scene preferably according to pile foundation simultaneously at hole number be arranged mud pit, the volume of mud pit be preferably pile foundation volume 1.3~
1.6 times, respectively 1, slurrying pond, volume are wet process into 0.1 times of hole section pile foundation volume, pulp storage tank 1, volume be wet process at
0.2~0.5 times of hole section pile foundation volume, pulp storage tank volume must be matched with mud decomposition time and penetration rate, and sedimentation basin 1,
Volume is equal at hole section pile foundation volume with wet process.Mud uses bentonite pulping, and mixes suitable caustic soda, anti-sloughing agent, leak stopping
The match ratio of agent, mud is generally water: bentonite: caustic soda: anti-sloughing agent: sealing agent=1:0.1:0.008:0.001:0.001, bores
During hole, mud balance is preferably controlled in 1.1~1.3t/m3, mud should shift to an earlier date prepares storage for 24 hours.Since caustic soda content is excessive
The decomposition of mud will be accelerated to precipitate, the volume of caustic soda should be reduced in right amount in the case where meeting pH value.
4, it drills: the suitable rotary drilling rig of torque, run of steel, the redundancy of torque should be chosen according to depth, aperture
It should be greater than 1.15 times or more.Collapsible loess preferably uses hosqe bit.
Original place rotates clockwise aperture when drilling, first creeps at a slow speed, after being drilled into soil layer 1m or less, then is changed to normal speed brill
Into.The new loess geology of pile foundation top half is more loose, crack cratering development section using dry method without mud drilling, rotary drilling repeatedly
Head squeezes hole wall, keeps hole wall closely knit, penetration rate 3m/h；Pile foundation lower half portion strong yellow soil, ancient soil section are wet using hosqe bit
The positive drilling of method drilling, 4~8m/h of penetration rate, reversion promotion is clear to be cut and supplements mud into hole immediately, answers in boring procedure
Mud prescription and specific gravity are adjusted according to soil property situation；When churning driven reversion is promoted, it should control and promote speed in 8m/min, it is unsuitable
It is too fast, in case forming negative pressure causes collapse hole.
5, examine hole: stake holes is made a record using intelligence inspection hole instrument detection.
6, borehole cleaning: the pile foundation settling velocity of Canal in Loess Area 70m or more is sunk in 5~10cm/h or so with the long increase of stake
Shallow lake speed is increase accordingly.
Borehole cleaning carries out in two stages: the first stage: first time borehole cleaning is carried out after drilling to completion, with rotary digging drill bit
After clearing up sediment.Second stage: second of borehole cleaning is carried out after good under steel reinforcement cage, conduit, volume weight of slurry preferably controls after borehole cleaning
1.02~1.1t/m3。
After half bore puddling wet process pore-forming, sediment is cleared up with rotary drilling digger, sediment is proposed outside hole.It is carried out after being got well under conduit
Secondary pile hole cleaning blows bottom using high pressure water and turns over quarrel, and direct circulation is taken directly to dilute height in bottom hole admixture low-gravity mud or clear water
Concentration drilling slurry is to 1.1t/m3Below.
7, fabrication of reinforcing cage and installation
The production of steel reinforcement cage: steel reinforcement cage is mechanically connected using sleeve.
Steel reinforcement cage must be used uniformly reinforcing bar rolling cage machine merogenesis machine-shaping in steel bar meter field or be divided using long positioning moulding bed
Machine-shaping is saved, two section steel reinforcement cage main reinforcements of every contiguous concatenation must splice integrally in advance, decompose again after being processed into skeleton
It opens, and carries out the label of docking, to splice in aperture.
Steel reinforcement cage preferably uses the steel bar meter of 12m cut lengths.Reinforced bar sleeve mechanical connection preferably uses straight spiral grains, with
It avoids reducing reinforcing steel bar bear section.Steel reinforcement cage spreading preferably uses length silk spreading, answers long filament in upper, short silk under, in order to avoid sleeve
It is squeezed and should not rotate by steel reinforcement cage self weight, sleeve is rotated down docking, to reduce the pressure of docking.The protective layer of framework of steel reinforcement
Positioning bar should not be used, mortar annular cushion block is preferably used.
The installation of steel reinforcement cage:
Steel reinforcement cage should be welded special fashioned iron rectangle well-head frame in aperture spreading and carry out steel reinforcement cage support and fill as concrete
It infuses platform to use, well-head frame is welded into " well " font using Two bors d's oeuveres I-steel and is placed in aperture, and it is straight that interior headroom size is greater than steel reinforcement cage
Diameter 20cm or more.When steel reinforcement cage is transferred, rod iron or I-steel are laterally penetrated to the fixed next section reinforcing bar of support along well-head frame top
Cage prevents its sinking, then lifts again to connecting a section steel reinforcement cage.
To avoid steel reinforcement cage from deforming, supporting rib is arranged in steel reinforcement cage, is fixed during transportation using locating rack.Supporting rib exists
Steel reinforcement cage is cut off after entering hole, prevents jam conduit.
Sleeve is mounted on upper section steel reinforcement cage reinforcing wire mouth by lower section steel reinforcement cage in advance after being installed, to upper section steel reinforcement cage
After main reinforcement and the contraposition of lower section steel reinforcement cage main reinforcement, sleeve is reversely rotated and is declined, is located at bushing core at steel bar end.Steel reinforcement cage
Spreading steel reinforcement cage should be vertically sling when installation, must not be tilted.
After the completion of reinforcing bar cage hoisting, top hangs muscle of burn-oning is fixed on well-head frame.The reinforcing rib of a most upper section is reinforced
Welding, and reinforce with main reinforcement welding " ┍ " shape muscle, prevent desoldering, deformation.
Pile measurement sound detecting pipe synchronous spreading when steel reinforcement cage is installed.
8, conduit is installed
Conduit is connected using silk mouth, single-unit full-length 4m.It is anti-that examination spelling, waterproof test and connector are carried out before use
Draw test.Catheter diameter must meet the needs of concrete pouring speed and concrete back-pressure jacking diffusion diameter, and the pile foundation of diameter 2m or more is led
Bore is not less than 35cm.
9, filling concrete
Half bore mud wet process pore-forming pile foundation uses catheterized reperfusion concrete piles.It, should be again to the heavy quarrel of bottom hole, mud before perfusion
Specific gravity is checked.Pile foundation of growing up generally just measure it is larger, the concrete initial set time should be longer than it is estimated pour 1.3~1.5 times of the time,
But no more than 20h, long-acting retardation water reducing agent trial is added when carrying out match ratio trial and is determined.
Because growing up, pile foundation slurry amount is more, precipitation capacity is relatively large during concrete placings, and depth of tremie is not preferably less than 10m.For
Ensure stake top quality, the stake top absolute altitude of pile foundation of growing up perfusion should be higher by 1.0m or more than design, cut before redundance pile extension, residual
Remaining pile crown should be without unconsolidated formation.When perfusion to stake top absolute altitude, stake top above section reinforcing bar is entangled using pvc pipe, to protect reinforcing bar to exist
It is not damaged when cutting pile crown.In perfusion to stake top, since hopper to concrete face height difference becomes smaller, concrete top surface beds of precipitation thickness thickens,
Concrete pouring is difficult, need to dilute the mud of concrete top surface using high pressure water and exclude, and promote hopper height.
The present embodiment is using acquired by collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique
Performance analysis it is as follows:
1, mud amount needed for collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction is few, comparison
Impact drill, circulation drilled as holes reduce mud pit, mud-settling pit etc. face construction apply build, reduce preparation and the place of mud
Reason, reduces the use of the equipment such as mud separator, gas lift reverse circulation borehole cleaning, relatively impacts drilled as holes, every cubic metre can reduce into
This about 150 yuan.
2, construction quality is more reliable.Collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction,
Half bore mud off is significant to collapse hole and other effects is reduced, and high pressure water blows bottom and turns over quarrel progress borehole cleaning, can clean out the heavy quarrel of bottom hole,
A possibility that heavy quarrel of pile foundation concrete presss from both sides mud is reduced, quality is easier to ensure that.
3, safer.Collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming hole wall should not collapse
It collapses, ground should not settle, safer.
4, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction bores quarrel and directly excavates, high pressure
Water blows bottom and turns over quarrel progress borehole cleaning, and drilling, borehole cleaning speed are faster than impact drilled as holes, compare impact drill drilling construction, can save the duration
2/3；And pile foundation top half uses dry method pore-forming, can further shorten the construction time, speed up the work, and reduces equipment money
The correlation engineerings expenses such as source occupancy.
5, collapsible loess super long large diameter pile foundation churning driven half bore mud wet process drilling construction bores quarrel and directly utilizes drilling machine
It proposes outside hole, spoil ground stacking can be directly transported to by dumper, reduces the discharge of mud, reduces environmental pollution.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique, which is characterized in that including
The determination of pile foundation churning driven half bore mud wet process pore-forming condition, smooth location bury casing, slurrying, drilling, borehole cleaning, steel
The production of muscle cage, the installation of steel reinforcement cage, conduit installation and filling concrete:
The determination of pile foundation churning driven half bore mud wet process pore-forming condition: to serious collapsible loess location, soil structure is loose, hole
The development of gap cratering, length are more than the large diameter pile foundation of 75m, lower part pile foundation water content > 23.5%, 1.8~2.5m of diameter using rotation
It digs and bores half bore mud wet process pore-forming；
Smooth location: smooth grinding compacting is carried out to pile foundation construction place, place surrounding excavates intercepting ditch, and place should be formed unidirectionally
Or the two-way draining horizontal slope for being greater than 2%；
Embedded casing: embedded casing length should pass through soft layer and the soil layer that easily collapses, 2 meters of layer slightly close into soil structure, and can be full
Foot resists extruding of the construction loads to pile lining, and casing periphery gap is closely knit using clay or mortar filling；
Slurrying: mud pit is arranged at hole number simultaneously according to pile foundation, mud uses bentonite pulping, and mixes caustic soda, prevents
Collapse agent and sealing agent；In boring procedure, mud balance is controlled in 1.1~1.3t/m3, mud should prepare storage in advance；
Drilling: original place rotates clockwise aperture when drilling, first creeps at a slow speed, after being drilled into soil layer 1m or less, then is changed to normal speed
Drilling；Pile foundation top half geology is more loose, pores'growth section using dry method without mud drilling, rotary drilling-head extruded hole repeatedly
Wall keeps hole wall closely knit；Using the positive drilling of hosqe bit wet process drilling, reversion promotes clear quarrel and immediately to hole for pile foundation lower half portion
Interior supplement mud should adjust mud prescription and specific gravity according to soil property situation in boring procedure；
Examine hole: stake holes is made a record using intelligence inspection hole instrument detection；
Borehole cleaning: after half bore puddling wet process pore-forming, sediment is cleared up with rotary drilling digger, sediment is proposed outside hole；It is good laggard under conduit
Row secondary pile hole cleaning blows bottom using high pressure water and turns over quarrel, and direct circulation is taken directly to dilute in bottom hole admixture low-gravity mud or clear water
High concentration drilling slurry is to 1.1t/m3Below；
The production of steel reinforcement cage: two section steel reinforcement cage main reinforcements of steel reinforcement cage merogenesis machine-shaping, every contiguous concatenation must be spliced into advance
One, disassembles, and carry out the label of docking after being processed into skeleton, again to splice in aperture；
The installation of steel reinforcement cage: steel reinforcement cage is mechanically connected using sleeve, and sleeve is mounted on by lower section steel reinforcement cage in advance after being installed
On upper section steel reinforcement cage reinforcing wire mouth, after upper section steel reinforcement cage main reinforcement and the contraposition of lower section steel reinforcement cage main reinforcement, sleeve is reversely rotated down
Drop, is located at bushing core at steel bar end；
Conduit installation: conduit is connected using silk mouth, single-unit full-length 4m, catheter diameter is not less than 35cm；
Filling concrete: half bore mud wet process pore-forming pile foundation use catheterized reperfusion concrete piles, before perfusion, should again to bottom hole,
Mud balance is checked；Depth of tremie is not less than 10m during concrete placings, and the stake top absolute altitude of pile foundation of growing up perfusion should be than design
Height is higher by 1.0m or more, when perfusion to stake top absolute altitude, the part reinforcing bar in stake top is entangled using pvc pipe, to protect reinforcing bar to exist
It is not damaged when cutting pile crown.
2. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the casing is steel pile casting, casing internal diameter is 20cm or more bigger than stake diameter, and thickness is not less than 12mm, when stake diameter is big
When 2.2m, dual-layer welding is reinforced at the top of casing；Casing merogenesis section a length of 2m uses excavator when shield-tube embedment is shorter
It buries, is buried when longer using churning driven major diameter drill bit brill, casing periphery gap is closely knit using clay or mortar filling.
3. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the volume of the mud pit is 1.3~1.6 times of pile foundation volume, the system for being 0.1 times of pile foundation volume including volume
Stock tank one, the volume sedimentation basin equal with pile foundation volume for 0.2~0.5 times of the pulp storage tank one and volume of pile foundation volume
One；The raw material and quality mixture ratio of the mud are water: bentonite: caustic soda: anti-sloughing agent: sealing agent=1:0.1:0.008:
0.001:0.001。
4. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the drilling is greater than 1.15 times of rotary drilling rig, hosqe bit, and the drilling to drill using torque redundancy
Speed are as follows: general new loess, crack cratering develop section penetration rate 3m/h, strong yellow soil, 4~8m/h of ancient soil penetration rate；It mentions
Drilling speed degree: when churning driven reversion is promoted, it should control and promote speed in 8m/min.
5. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the borehole cleaning carries out in two stages: the first stage: after drilling to completion, it is heavy to be cleared up with rotary digging drill bit
Slag；Second stage: carrying out after good under steel reinforcement cage, conduit, and volume weight of slurry control is in 1.02~1.1t/m after borehole cleaning3。
6. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the steel reinforcement cage is formed using the steel bar meter of 12m length, reinforced bar sleeve mechanical connection is using the straight spiral shell of rolling
Line；Steel reinforcement cage spreading uses length silk spreading, answers long filament in upper, short silk under；The protective layer of framework of steel reinforcement is using mortar annular
Cushion block.
7. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, after the completion of the reinforcing bar cage hoisting, top hangs muscle of burn-oning is fixed on well-head frame；The reinforcing rib of a most upper section into
Row reinforces welding, and reinforces with main reinforcement welding " ┍ " shape muscle.
8. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, the conduit will carry out examination spelling, waterproof test and connector tensile test before use；Catheter diameter must meet
The needs of concrete pouring speed and concrete back-pressure jacking diffusion diameter, the pile foundation catheter diameter of diameter 2m or more are not less than 35cm.
9. a kind of collapsible loess super long large diameter pile foundation churning driven half bore mud wet process pore-forming technique as described in claim 1,
It is characterized in that, in the filling concrete step, in perfusion to stake top, since hopper to concrete face height difference becomes smaller, concrete top surface
Beds of precipitation thickness thickens, and concrete pouring is difficult, need to dilute the mud of concrete top surface using high pressure water and exclude, and promote hopper height.
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| CN111236220A (en) * | 2020-01-19 | 2020-06-05 | 中交第三航务工程局有限公司江苏分公司 | Construction process of punching cast-in-place pile of mixed foundation in sea-filling area |
| CN112064626A (en) * | 2020-09-11 | 2020-12-11 | 保利长大工程有限公司 | Construction method of super-long large-diameter rotary digging pile |
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| CN111236220A (en) * | 2020-01-19 | 2020-06-05 | 中交第三航务工程局有限公司江苏分公司 | Construction process of punching cast-in-place pile of mixed foundation in sea-filling area |
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Application publication date: 20181225 |