CN110106872A - A kind of super thick mud head of district casing concrete pouring of punched hole piles method - Google Patents
A kind of super thick mud head of district casing concrete pouring of punched hole piles method Download PDFInfo
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- CN110106872A CN110106872A CN201910375447.XA CN201910375447A CN110106872A CN 110106872 A CN110106872 A CN 110106872A CN 201910375447 A CN201910375447 A CN 201910375447A CN 110106872 A CN110106872 A CN 110106872A
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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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
Abstract
The present invention discloses a kind of super thick mud head of district casing concrete pouring of punched hole piles method, is related to concrete pouring of punched hole piles technical field；More than silt soil strata it is greater than the drill hammer reaming drilling and mud off pore-forming of stake diameter 200mm using diameter, into mud, using long cylinder-wall protecting, crawler crane cooperates the long casing of vibration hammer hydraulic tongs vibroflotation to carry out mud drilling, it breaks through mud and uses the drill hammer drilling completion pore-forming for meeting a diameter instead, the rock depth that enters that punching reaches design requirement carries out borehole cleaning, steel reinforcement cage is hung in after borehole cleaning to designed elevation, organize bore forming, concrete perfusion, place conduit, more than continuous pouring concrete to design stake top absolute altitude 800~1000mm, organize the extraction and pile concrete supplementary irrigation of long casing, pile work is completed.
Description
Technical field
The present invention discloses a kind of super thick mud head of district casing concrete pouring of punched hole piles method, is related to concrete pouring of punched hole piles skill
Art field.
Background technique
With the continuous development of economy and society and the continuous quickening of process of modernization, it is becoming tight urban land day,
It is more such for coastal area city.The method of the cofferdam island Tun Tuzhu sea reclamation is used to solve its increasing land used
Anxiety has quietly been risen in coastal cities.
Concrete pouring of punched hole piles under short-term sea reclamation geological conditions, because soil property does not complete self weight consolidation, soil quality stabilizing
Difference, soil layer gap is more, Yi Yinqi spillage, collapse hole；Especially " excavated by manual work buries short casing to soft layer, and the small stroke of drilling machine is repeatedly
Impact plus ball clay and slabstone pore-forming " Punching Borehole Cast-in-place Concrete Pile pore-forming technique is in super thick mud area in application, because mud is in stream modeling
Property, thickness it is big, Yi Yinqi collapse hole falls into hammer, and pore-forming is difficult big, and speed of fulfiling hole is slow, and the duration can not ensure, fullness coefficient causes greatly material
The problems such as material waste, increased costs.The method of the present invention is for super under the short-term sea reclamation geological conditions for not completing self weight consolidation
Thick mud area bored pile piling construction problem provides a kind of super thick mud head of district casing concrete pouring of punched hole piles method, solves
Mud area Punching Borehole Cast-in-place Concrete Pile super thick soft layer is effectively protected using the easy collapse hole of traditional handicraft, viscous hammer, the technical problem for being difficult to pore-forming
Pile quality has been demonstrate,proved, while having reduced the pile fullness coefficient under such soil condition, has saved cost, has accelerated pile speed
Degree, saves the duration.
Summary of the invention
The present invention is directed to the demand and shortcoming of current technology development, provides a kind of super thick mud head of district casing punching filling
Pile construction method is infused, is conducive to that coastal sea reclamation area is pushed to start architectural engineering development & construction in a short time, accelerates such
Regional construction investment recycles speed.
Technical solution of the present invention is specific as follows:
A kind of super thick mud head of district casing concrete pouring of punched hole piles method:
More than silt soil strata it is greater than the drill hammer reaming drilling and mud off pore-forming of stake diameter 200mm using diameter,
Into mud, using long cylinder-wall protecting, crawler crane cooperates the long casing of vibration hammer hydraulic tongs vibroflotation to carry out mud
Drilling,
Break through mud use instead meet a diameter drill hammer drilling complete pore-forming, punching reach design requirement enter rock depth
Degree carries out borehole cleaning,
Steel reinforcement cage is hung in after borehole cleaning to designed elevation, organizes bore forming, concrete perfusion places conduit, continuous pouring
More than concrete to design stake top absolute altitude 800~1000mm,
The extraction and pile concrete supplementary irrigation of long casing are organized, pile work is completed.
In the method before drill hammer reaming drilling, short casing is buried before short casing is buried in aperture in aperture and is surrounded
Concrete pier fender pile is symmetrically buried in stake site, and to control stake position, center point, short shield are checked in centering after the completion of short shield-tube embedment
Cylinder center and stake position centre deviation≤50mm.
Hole location, underlying short casing, short casing periphery backfill, on short casing top are excavated in the method when short shield-tube embedment
Lower setting, which is overflow, starches mouth.
Drill hammer reaming drilling in the method using diameter greater than stake diameter 200mm uses mud off, setting
Mud pit, pit capacity are 1.5-2.0 times of punching capacity.
Sedimentation basin is set in each mud pit end in the method, using bottom of pond height difference, carries out three-level precipitating.
Dregs area is set by sedimentation basin in the method, is placed in dregs area after sediment cleaning, retains following for mud out
Annular space and memory space.
Long cylinder-wall protecting is used in the method, after long casing places stable, position correctly in hole and is vertical, vibration
Rush long casing, every vibroflotation is sunk a distance, and failure of oscillation detects the verticality of long casing.
Mud is broken through in the method, is entered rock depth every time and is reached a certain distance borehole cleaning of progress, and sample, clearly
Mud balance control is 1.05-1.25 behind hole.
Steel reinforcement cage is hung in the method, carries out borehole cleaning after placing conduit, and when aperture is less than 800mm, borehole cleaning is used
Direct circulation mud jacking；
When aperture is greater than 800mm, liquid method for discharging residue borehole cleaning is risen using suction pump reacting cycle mode, duct.
The extraction of long casing is organized in the method: clearing up the laitance and soil on long casing periphery, and long casing stack shell exposes
Ground certain distance vibrates at the top of long casing, slowly up extricates oneself from a predicament and brace oneself up to action, observe the variation in long casing inner concrete face, vacancy is expired
Concrete is filled, continues vibration and extracts, stops pile pulling repeatedly and vibrates again, then continuously up extricate oneself from a predicament and brace oneself up to action, and protected in withdrawal process
It holds at the uniform velocity and pulls out.
Compared with the prior art, the invention has the beneficial effects that:
The present invention provides a kind of super thick mud head of district casing concrete pouring of punched hole piles method, more than silt soil strata uses straight
Diameter is greater than the drill hammer reaming drilling and mud off pore-forming of stake diameter 200mm, is carried out into mud using long cylinder-wall protecting
Band hangs the long casing of cooperation vibration hammer hydraulic tongs vibroflotation and carries out mud drilling, breaks through mud and uses the drill hammer for meeting a diameter instead
Drilling completes pore-forming, and the rock depth that enters that punching reaches design requirement carries out borehole cleaning, hangs in steel reinforcement cage to designed elevation, group after borehole cleaning
It is made into pile driving construction, concrete perfusion places conduit, more than continuous pouring concrete to design stake top absolute altitude 800~1000mm, group
The extraction and pile concrete supplementary irrigation of long casing are knitted, pile work is completed；
The present invention is conducive to that coastal sea reclamation area is pushed to start architectural engineering development & construction in a short time, accelerates such
Regional construction investment recycles speed, while solving mud area Punching Borehole Cast-in-place Concrete Pile super thick soft layer and easily being collapsed using traditional handicraft
Hole, viscous hammer, the technical problem for being difficult to pore-forming, have been effectively ensured pile quality, while reducing the pile under such soil condition
Fullness coefficient has saved cost, accelerates pile-forming speed, saves the duration.
Detailed description of the invention
Fig. 1 the method for the present invention flow diagram；
It bankets in Fig. 2 the method for the present invention and increases the schematic diagram of short casing；
Fig. 3 mud pit front schematic view；
Fig. 4 is mud pit side schematic view.
Appended drawing reference:
1 banket after ground elevation, 2 short casings, 3 slurry conduits, 4 first stage precipitation tanks, 5 second-level settling ponds, 6 three-levels precipitating
Pond, 7 tripods, 8 slush pumps, 9 mud diversion trenchs, 10 bored concrete piles, 11 long casings.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Using the method for the present invention, long casing punching is carried out to the super thick mud area under a certain short-term sea reclamation geological conditions
Filling pile construction.
Before construction survey, it is conscientiously familiar with drawing, understands design idea and construction requirement, calculating is carried out to stake position coordinate and is turned
It changes, the absolute altitude, axis and coordinate of drawing etc. is conscientiously checked, it is ensured that data are accurate.
Measurement and positioning unwrapping wire is using high-precision GPS or total station positioning and steel ruler measurement, in strict accordance with the formal construction of design
Drawing carries out setting-out, from control datum mark pilot measurement vertical control point and axial line control point, and carries out site elevation and copies survey work, stays
Enough hidden points are set, and are protected.Builder handles " Punching Borehole Cast-in-place Concrete Pile measure of pile position record " in time, by supervising engineer crowd
The construction of bored concrete pile can be punched out after standard.
It is embedded to carry out short casing 2, drilling machine is in place:
Before short casing 2 is buried in aperture, concrete pier fender pile is buried around the symmetrical four direction in stake site, to control stake
Position, burying should be secured, during rushing in, checks whether tup center line deviates stake position, the short 4-8mm thick steel plate of casing 2 at any time
Production, short 2 internal diameter of casing should be greater than design stake diameter 200mm, length 1.5-2.0m, and method for embedding can use excavation casing position
When backfilling of earthwork, i.e., excavation hole location, underlying short casing 2,2 periphery of short casing backfill, the position of ground elevation 1 after banketing, protect
Spillage, shield-tube embedment depth should not meet mud face requirement for height, generally 1.2-1.5m in hole to card, under short casing 2 top
1 or 2 slurry mouth that overflows is set at 20cm, and center point is checked in centering again after the completion of shield-tube embedment, in short 2 center of casing and stake position
Heart deviation≤50mm.
It is after short casing 2 is embedded that perforating press is in place, in place must be accurate, it is in place after stake machine Ying Pingwen, it is secured, straight,
Level, when work, must not shift, and adjust stake arm verticality, guarantee that verticality≤1% of hole wall is long.For status in construction area
Nature terrace, when being unable to satisfy the superfilled 800mm or more of concrete of design stake, using the method for increasing short casing 2 of banketing
It solves, with reference to Fig. 2；
Reaming drilling, mud off:
Drill hammer reaming using diameter greater than stake diameter 200mm is crept into, and when aperture, is answered low hammer is close to hit, is avoided the occurrence of tiltedly
Such as there is inclined hole in hole, must backfill above slabstone to inclined hole at 30-50cm, punching again；
When punching, it should accomplish diligent punching, frequently draw slag, to guarantee punching speed.For anti-stage collapse hole here, protected using mud
Wall, pulp noodle want the moment to keep certain position in hole, and mud pit is arranged near stake position in the not region of engineering pile, mud pool capacity
Amount is 1.5-2.0 times of punching capacity, and mud configuration index is shown in Table 1, sets detritus tank in each mud pit end, utilizes bottom of pond height
Difference carries out three-level precipitating, as shown in figure 3,6 multi-stage form of first stage precipitation tank 4, second-level settling pond 5 and three-level sedimentation basin, three-level is heavy
Tripod 7 is connected outside shallow lake pond 6, slurry conduit one end is connected in bored concrete pile 10, and the other end is connected in three-level sedimentation basin 6, and three
Slush pump 8 is also set up in grade sedimentation basin 6, mud diversion trench is connected to the upper end of long casing 11 and first stage precipitation tank 4；
Table 1
Settable dregs area by sedimentation basin, sediment guarantee that the circulation of mud is empty using dregs area is placed in after backhoe cleaning
Between and memory space, slurrying prepared using clay or bentonite, mud balance should meet design and code requirement, using day
The mud balance instrument of flat is tested；
Vibration hammers long casing 11:
Into after mud, using the long 11 retaining wall technique of casing of vibroflotation, vibrated using crawler crane cooperation vibration hammer hydraulic tongs
Beat long casing 11 and carries out mud drilling；
Long casing 11 uses steel bushing, and steel bushing wall thickness 12mm, length L=8-12m, steel bushing internal diameter should be beyond stake diameter not
Less than 100mm (containing 100mm), welding spreading is carried out according to site operation situation, injection equipment choosing spring vibration is hammered into shape, is hydraulic
Pincers, crawler crane (not being preferably less than 50t)；
The assembling of a equipment
After qualified spring vibration hammer, hydraulic tongs, crawler belt are hoisted to scene, scene carries out safety inspection, report to equipment
It tests, install, after connecting console debug, scene is stand-by；
The lifting of b steel bushing
Drill hammer of the configuration diameter greater than stake diameter 200mm or more, which charges and attacks surface fill stratum, after stake machine centering in place penetrates
Afterwards, drill hammer is proposed and is disassembled to be placed on that designated position is stand-by, start the injection of carry out standard steel bushing；
Using crawler crane by 20# wirerope by vibration hammer hydraulic tongs lift-off ground, crane in the case where special messenger commands ordinatedly
Face hydraulic tongs console, which clamps steel bushing, slowly to be lifted, and is slowly moved to and is had become hole location；
C steel bushing injection
By original positioning fender pier when in-site installation head section steel pile casting, cross hairs is drawn up, arm of crane is overhanging to make long casing hang down
Directly in spot face, four people's substation quadrangles are directed at hole location, slowly carry out long casing 11 and install, while setting up two theodolites at vertical
Verticality during straight direction controlling steel bushing injection is hung down after guaranteeing steel bushing molding so as to timely correction after verticality offset
Straight degree deviation is less than 1%；
When steel bushing injection, after long casing 11 places stable, position correctly in hole and is vertical, then vibration-sunk, often
Heavy 1.5m, failure of oscillation detect the verticality of steel bushing, find deviation timely correction；
Long casing subsidence velocity becomes smaller suddenly, should stop injection, and long casing 11 is pulled up 0.5-1.0m upwards, then weigh
New sinking, such as cannot still sink, then considers whether lower section has the barriers such as ratchel, if there is stone barrier, steel bushing can not
Sink, steel bushing is proposed outside hole, it is straight to be placed in ground, it is carried out that casing can be carried out again after stone is broken with percussive drill
Sinking construction；
When long 11 submergence depth of casing is above standard casing length, scene need to carry out welding lengthening to steel bushing, construction
When elder generation construction reference section steel bushing, when sinking apart from ground 1-1.5m, carry out the long welding of casing 11 and lengthen, it is same to lengthen casing 11
Standard paragraphs carry out butt welding, carry out outsourcing welding with 10mm thickness 200mm wide steel plate after the completion of butt welding, the long casing 11 after welding lengthening
It can continue injection decentralization after carrying out natural cooling, the natural cooling time is not less than 8min；
To guarantee that long casing 11 effectively penetrates super thick mud, need base area survey report to every pile soil layer creep into situation into
Row real-time control from drilling depth, 11 lowering velocity of long casing and determines that rock sample situation determines whether long casing 11 penetrates mud
Layer, and should ensure that long casing penetrates mud and enters subsoil and be no less than 1m；
Judge rock sample, first time borehole cleaning:
It breaks through after mud to use same stake diameter drill hammer instead and continue drilling and completes pore-forming,
Into after basement rock, the every drilling depth 100mm~300mm borehole cleaning sampling of bearing course at pile end is primary, and performs record.Every pile
Rock must be sentenced through surveying unit technical staff scene by returning magmatic rock sample, and after confirmation, report management is checked and accepted, and retains rock sample,
Acceptance(check) carries out borehole cleaning, using clean mud when borehole cleaning, slurry coat method feed pipe for mortar is inserted into bottom hole, utilizes mud
Slurry flows up in hole, residue band is portalled outer.After pore-forming, timely borehole cleaning, mud balance control is 1.05-1.25, with survey
Fathom amount checks hole depth.The residue of accumulation and extra mud clear specified place in time；
Fabrication of reinforcing cage:
Steel reinforcement cage binding securely should be processed in addition to meeting design requirement, should still be met the following requirements:
The types of attachment such as butt welding, binding, overlap welding or cold extrusion, gas pressure welding can be used in main reinforcement connector, and meet and accordingly apply
Work technical stipulation；
The steel reinforcement cage internal diameter of 3 pouring underwater concrete stake of slurry conduit should be greater than 3 junction outer diameter 10cm of slurry conduit with
On；
Steel reinforcement cage should be determined segmental machining length by lifting condition, and cover to reinforcement positioning device and welding lifting is arranged
Earrings；
Steel reinforcement cage tolerance is shown in Table 2:
Table 2
| Serial number | Project | Tolerance |
| 1 | Main reinforcement spacing | ±10mm； |
| 2 | Stirrup spacing | ±20mm； |
| 3 | Length of reinforcing cage | ±100mm； |
| 4 | Steel reinforcement cage diameter | ±10mm； |
| 5 | Protective layer thickness | ±20mm。 |
Within the scope of the 0.5-0.8m of steel reinforcement cage lower end main reinforcement should slightly inwards lateral bend it is oblique；
Bar spacing is not greater than 300mm, and should use spiral bar；
Steel reinforcement cage rigidity answers reinforcement when poor, must not deform in handling；
It hangs steel reinforcement cage, place slurry conduit 3:
After borehole cleaning, the measurement of hole depth, aperture, verticality is carried out, and performs record, is immediately placed in steel reinforcement cage, and will
Steel reinforcement cage carries out effectively fixing at the steel pile casting of aperture, floats up it not during casting concrete, does not sink.Reinforcing bar
Cage, which is hung, preferably uses truck crane cooperation is artificial to carry out；
Steel reinforcement cage should dispose slurry conduit 3 after placing, 3 wall thickness of slurry conduit is not preferably less than 3mm, and diameter is preferably 200-
250mm, the assembled, pressure testing using preceding examination of slurry conduit 3, qualified rear can be used.When hanging slurry conduit 3, position should ensure that
Between two parties, axis is straight, slow sinking, prevents jam steel reinforcement cage and touches hole wall, and slurry conduit 3 is suitable for reading to set funnel and storage hopper, under
Mouth is preferably 300-500mm away from bottom hole；
Under steel reinforcement cage and slurry conduit 3 it is complete and check it is errorless after should immediately casting concrete, interval time 4h is not to be exceeded,
To prevent mud sediment and the hole that collapses；
Second of borehole cleaning:
It transfers steel reinforcement cage, slurry conduit 3 after the installation is completed, carries out secondary pile hole cleaning, utilize sinking in mud circulation cleaning eye
Slag,
When aperture is less than 800mm, secondary pile hole cleaning can obtain good effect using direct circulation mud jacking；When aperture is big
When 800mm, liquid method for discharging residue borehole cleaning is risen using suction pump reacting cycle mode, duct；
Mud property index after secondary pile hole cleaning: specific gravity 1.15-1.2, sand factor < 6%, bottom hole sediment meet code requirement.
Concrete perfusion:
Underwater concrete must have a good workability, and match ratio should be determined by test, slump control 18~
22cm,
The calculating of first batch of concrete perfusion quantity:
By code requirement, first batch of concrete perfusion quantity should be able to meet 0.8m or more in conduit Transducers Embedded in Concrete,
Required concrete quantity is calculated as follows:
V≥πR2(H1+H2)+πr2h1
In formula: V --- first batch of concrete requirement (m3) is perfused；
R --- stake holes radius (m)；
H1 --- stake holes bottom to conduit bottom end spacing, takes 0.4m；
H2 --- the first buried depth of conduit takes 0.8m；
R --- conduit radius (m)；
H1 --- when stake holes inner concrete reaches buried depth H2, the outer mud pressure institute of conduit inner concrete column equilibration conduit
The height (m) needed.When filling concrete, coagulation soil hopper can be placed at the top of conduit, volume is greater than first batch of concrete perfusion
Quantity, it is ensured that the depth in conduit Transducers Embedded in Concrete.H1 >=γ w Hw/ γ c, wherein tank pours rear stake inner concrete top headed by Hw
The height difference in identity distance stake top face, γ w are mud balance in stake holes, and γ c is concrete density.
When perfusion, Ying Lianxu, compact progress forbid midway to stop work, and in filling process, concrete should be poured slowly into leakage
Bucket, in order to avoid resistance pipe,
When starting concrete perfusion, reliable water proof facility should be set in the base opening of funnel, stake diameter > 1000mm's, it uses
Inflatable basketball or vollyball do water proof bolt；Stake diameter≤1000mm, does water proof bolt using geotechnological cloth bag fresh concrete,
Slurry conduit 3 should ensure that position is placed in the middle in lifting process, and the buried depth in concrete of slurry conduit 3 is preferably 2-6m,
And special messenger measures depth of tremie at any time and manages the height difference in inside and outside filling concrete face, avoids the occurrence of broken pile,
Concrete is superfilled to design stake top absolute altitude 0.8-1.0m, and the later period, which manually picks, to be dug to designed elevation,
To prevent rising of steel cage, when the top of concrete of perfusion is away from steel reinforcement cage bottom 1m or so, concrete should be reduced
Rate of flooding, when hole, inner concrete is risen to away from framework of steel reinforcement bottom 4m or more, promoted slurry conduit 3, lead its mud
3 base opening of pipe is higher than steel reinforcement cage bottom 2m or more, can restore normal perfusion speed.
Concrete slump should be checked before casting concrete, and witness sampling makes concrete test block, concrete test block stays
Corresponding code requirement should be met by setting；
Long casing 11 is extracted in vibration:
Pile concrete carries out the extraction construction of steel bushing after pouring, time started control is complete in concreting
Finish 0.5-1 hours afterwards, and must not exceed concrete stirring outbound 5 hours afterwards,
The laitance and soil on long 11 periphery of casing are cleared up, guarantee that long 11 stack shell of casing bassets 0.5m or so, then
It is accurately clamped using crane cooperation vibrating hydraulic pincers and vibrates 2-5min at the top of long casing 11, made soil loosening around casing, reduce soil
To casing frictional resistance, then slowly up extricate oneself from a predicament and brace oneself up to action,
Long casing 11 is first extracted into about 1-1.5m height, observes the variation in casing inner concrete face, it will be empty in long casing 11
Position about 1.5m height full irrigation concrete, then vibration extraction is carried out,
Two theodolites should be set up when extraction controls verticality at vertical direction, timely correction after being deviated so as to verticality,
And pay attention to crane and vibration pincers load condition, when pulling out difficulty or pull out to come up in discovery, stops pile pulling and vibrated after 3-5min again again
Continuously up extricate oneself from a predicament and brace oneself up to action, repeatedly extract long casing 11, remain a constant speed in withdrawal process on pull out.
In above-mentioned implementation process, concrete pouring of punched hole piles inspection of quality executes following standard:
" technical code for building pile foundation " (JGJ94)；
" building foundation engineering construction quality acceptance specification " (GB50202).
In above-mentioned implementation process, main material is shown in Table 3.
Table 3
Capital equipment is shown in Table 4,
Table 4
Main measurement, measurement instrument, are shown in Table 5,
Table 5
It is super present invention is particularly suitable for existing within the scope of pile soil property under short-term (less than 3 months) sea reclamation geological conditions
The concrete pouring of punched hole piles of thick mud layer (thickness is greater than 8m).
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of super thick mud head of district casing concrete pouring of punched hole piles method, it is characterised in that
More than silt soil strata it is greater than the drill hammer reaming drilling and mud off pore-forming of stake diameter 200mm using diameter,
Into mud, using long cylinder-wall protecting, crawler crane cooperates the long casing of vibration hammer hydraulic tongs vibroflotation to carry out mud drilling,
Break through mud use instead meet a diameter drill hammer drilling complete pore-forming, punching reach design requirement enter rock depth into
Row borehole cleaning,
Steel reinforcement cage is hung in after borehole cleaning to designed elevation, organizes bore forming, concrete perfusion places conduit, continuous pouring coagulation
More than soil to design stake top absolute altitude 800~1000mm,
The extraction and pile concrete supplementary irrigation of long casing are organized, pile work is completed.
2. according to the method described in claim 1, it is characterized in that drill hammer reaming drilling before, bury short casing in aperture,
Before short casing is buried in aperture, concrete pier fender pile is symmetrically buried around stake site, to control stake position, after the completion of short shield-tube embedment
Center point, short casing center and stake position centre deviation≤50mm are checked in centering.
3. according to the method described in claim 2, it is characterized in that when short shield-tube embedment excavate hole location, underlying short casing, short shield
The slurry mouth that overflows is arranged in the backfill of cylinder periphery under short casing top.
4. method according to claim 1 to 3, it is characterised in that be greater than the drill hammer of stake diameter 200mm using diameter
Reaming drilling uses mud off, and mud pit is arranged, and pit capacity is 1.5-2.0 times of punching capacity.
5. according to the method described in claim 4, utilizing bottom of pond height it is characterized in that set sedimentation basin in each mud pit end
Difference carries out three-level precipitating.
6. according to the method described in claim 5, sediment is placed in slag after clearing up it is characterized in that dregs area is arranged by sedimentation basin
Tu Qu retains the cyclic space and memory space of mud out.
7. -6 any method according to claim 1, it is characterised in that use long cylinder-wall protecting, put in hole to long casing
Set stablize, position is correct and it is vertical after, the long casing of vibroflotation, every vibroflotation is sunk a distance, and failure of oscillation detects the verticality of long casing.
8. according to the method described in claim 7, it is characterized in that break through mud, enter every time rock depth reach certain distance into
Borehole cleaning of row, and sample, mud balance control is 1.05-1.25 after borehole cleaning.
9. method according to claim 1 or 8, it is characterised in that hang in steel reinforcement cage, carry out borehole cleaning after placing conduit, work as hole
When diameter is less than 800mm, borehole cleaning uses direct circulation mud jacking；
When aperture is greater than 800mm, liquid method for discharging residue borehole cleaning is risen using suction pump reacting cycle mode, duct.
10. according to the method described in claim 9, it is characterized in that organizing the extraction of long casing: clearing up the floating of long casing periphery
Slurry and soil, long casing stack shell basset certain distance, vibrate at the top of long casing, slowly up extricate oneself from a predicament and brace oneself up to action, and observe in long casing and mix
Vacancy full irrigation concrete is continued vibration and extracted by the variation for coagulating soil face, is stopped pile pulling repeatedly and is vibrated again, then continuously up
It extricates oneself from a predicament and brace oneself up to action, and pull out on remaining a constant speed in withdrawal process.
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| CN110565634A (en) * | 2019-09-06 | 2019-12-13 | 重庆中科建设（集团）有限公司 | Method for repeatedly constructing and utilizing ultra-long steel casing |
| CN111778970A (en) * | 2020-06-16 | 2020-10-16 | 中交二航局第四工程有限公司 | Measurement and control method for sinking of pile group steel casing of far-shore non-construction platform |
| CN112459055A (en) * | 2020-12-16 | 2021-03-09 | 绍兴文理学院 | Method for preventing pile casing from sinking and non-uniform settling |
| CN113585993A (en) * | 2021-07-22 | 2021-11-02 | 深圳市工勘岩土集团有限公司 | Drilling and hole-cleaning pile-forming method for super-thick covering layer large-diameter rock-socketed cast-in-place pile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110565634A (en) * | 2019-09-06 | 2019-12-13 | 重庆中科建设（集团）有限公司 | Method for repeatedly constructing and utilizing ultra-long steel casing |
| CN111778970A (en) * | 2020-06-16 | 2020-10-16 | 中交二航局第四工程有限公司 | Measurement and control method for sinking of pile group steel casing of far-shore non-construction platform |
| CN112459055A (en) * | 2020-12-16 | 2021-03-09 | 绍兴文理学院 | Method for preventing pile casing from sinking and non-uniform settling |
| CN112459055B (en) * | 2020-12-16 | 2022-02-08 | 绍兴文理学院 | Method for preventing pile casing from sinking and non-uniform settling |
| CN113585993A (en) * | 2021-07-22 | 2021-11-02 | 深圳市工勘岩土集团有限公司 | Drilling and hole-cleaning pile-forming method for super-thick covering layer large-diameter rock-socketed cast-in-place pile |
| CN113914305A (en) * | 2021-08-31 | 2022-01-11 | 中国化学工程第十四建设有限公司 | Breakwater filling pile hole-forming filling method |
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