CN106049467A - Method for treating slurry leakage of bored pile through percussion drill under complex geology - Google Patents
Method for treating slurry leakage of bored pile through percussion drill under complex geology Download PDFInfo
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- CN106049467A CN106049467A CN201610625832.1A CN201610625832A CN106049467A CN 106049467 A CN106049467 A CN 106049467A CN 201610625832 A CN201610625832 A CN 201610625832A CN 106049467 A CN106049467 A CN 106049467A
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- Prior art keywords
- spillage
- hole
- slurry
- mud
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Classifications
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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
-
- 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
Abstract
The invention discloses a method for treating slurry leakage of a bored pile through a percussion drill under the complex geology. The method comprises the following steps that firstly, the slurry leakage degree is judged; secondly, slurry leakage treatment is conducted, and if the slurry leakage degree is slight slurry leakage, slurry continues to be supplemented into a hole, drilling continues or drilling continues after the hole is refilled with clay till the upper surface of the slurry is recovered to the initial height; if the slurry leakage degree is serious slurry leakage, flag stone and cement are thrown into the hole till the slurry is recovered to the initial height, drilling continues, and if all slurry in the hole leaks, the percussion drill is used for conducting impacting after the flag stone and the cement are thrown into the hole, the slurry is injected into the hole after the flag stone is embedded in a protection wall, and drilling is conducted again; and thirdly, hole forming is conducted, during slurry leakage, the slurry leakage degree is judged according to the declining quantity of the slurry in the hole within unit time, different treatment methods are selected according to different slurry leakage degrees, a geology cavity where the slurry leaks is blocked, the firm slurry protection wall is formed, the phenomenon of slurry leakage is effectively controlled, and normal construction of the bored pile is ensured.
Description
Technical field
The present invention relates to the impact drilling bored concrete pile technology field, under especially a kind of complicated geological, drill-pouring is bored in impact
Stake spillage processing method.
Background technology
Bored concrete pile system refers to pass through the means such as machine drilling, steel pipe soil compaction or manpower excavation at engineering site in foundation soil
Forming stake holes, and within it place steel reinforcement cage, concrete perfusion and the stake made, different according to forming hole method, bored concrete pile again may be used
It is divided into several classes such as driven cast-in-place pile, cast-in-situ bored pile and digging hole filling pile.
Existing percussive drilling, boring is grabbed in punching and abrasion drill is whittled into hole etc. and all can use mud off construction method.This construction
The process of method is:
Smooth location → slurrying → bury casing → laying work platforms → rigging up underground and position → drilling and forming hole
→ clear hole also checks hole quality → transfer steel reinforcement cage → pouring underwater concrete → extract casing → check on the quality.
Sequence of construction:
(1) preparation of construction
Preparation of construction includes: select rig, drilling tool, Ground arrangement etc..
Rig is the capital equipment of bored pile construction, can come according to the application conditions of geological condition and various boring machine
Select.
(2) installation of boring machine and location
If the basis installing boring machine is unstable, construction is easily generated boring machine inclination, stake inclination and stake bias etc. no
Good impact, therefore it is required that mounting foundation consolidates.Acclive ground more soft to stratum, available bull-dozer is bulldozed, and is padded with steel
Plate or sleeper are reinforced.
For preventing stake position from being forbidden, construction it is important reserve center and correct installation boring machine, to there being brill
The boring machine of tower, the power first with rig coordinates with neighbouring cage, is moved by drilling rod and substantially positions, then with jack by machine
Frame jack-up, is accurately positioned, make the hole clipping of gin wheel, drill bit or fixing drilling rod and casing center on a vertical line, to ensure brill
The perpendicularity of machine.The deviation of rig position is not more than 2cm.Behind align piles position, with tie plate horizontal drill machine crossbeam and symmetrical at tower top
Cable wind rope is pulled on drill axis.
(3) casing is buried underground
Boring success or failure it is crucial that prevent hole wall collapse.When holing deeper, the hole wall soil below level of ground water is quiet
Can cave in hole under water pressure, quicksand phenomenon even occurs.If the head higher than level of ground water can be kept in Zuan Kong, increase hole
Interior hydrostatic pressure, can be hole wall, prevent the hole that collapses.Casing, in addition to playing this effect, has isolation surface water, protection aperture with fashion
Ground, spud pile hole site and drill bit guide effect etc..
The material making casing has wood, steel, armored concrete three kinds.Casing requires sturdy and durable, water-tight, and its internal diameter should
Bigger than bore diameter (the biggest 20cm of rotary drilling, diving bores, impacts or rushes grabs the biggest 40cm of cone), often joint length about 2～3m.Typically
Common Steels casing.
(4) slurrying
Drilling slurry is made up of water, clay (bentonite) and additive.There is floating outstanding boring mud, cooling drill bit, lubrication drilling tool,
Increase hydrostatic pressure, and form mud skin at hole wall, cut off seepage flow inside and outside hole, the effect in the hole that prevents from collapsing.Modulation drilling slurry and
Through the mud of circularly purifying, should determine slip consistency according to boring method and strata condition, slip consistency should regard stratum and become
Changing or operation requires motor-driven grasp, mud is the dilutest, and deslagging ability is little, retaining wall weak effect；Mud is the thickest can weaken drill bit impact merit
Can, reduce rate of penetration.
(5) boring
Boring is one critical process, must carry out in strict accordance with operation requirement, guarantee hole quality in construction,
It is first noted that perforate quality, to good center line and perpendicularity, and casing must be pressed for this.It is noted that constantly add in construction
Mud and take out slag (impact type with), also to check whether pore-forming has skewness at any time.Impact type or punching is used to grab churn and execute
In man-hour, neighbouring soil layer affects the firm of adjacent hole because being given a shock.So the hole being drilled should clear hole in time, transfer steel reinforcement cage and filling
Note underwater concrete.The order of boring also should advance planning good, should ensure that the construction of next stake holes does not affect one
Stake holes, makes the displacement of rig the most too far and interfere again.
(6) clear hole
It is right and wrong with pile body that the degree of depth, diameter, position and the hole shape of boring is directly connected to pile quality.To this end, except boring
During closely outside observation supervision, reach after design requires the degree of depth in boring, reply hole depth, Kong Wei, hole shape, aperture etc. are examined
Look into.When checking that complying fully with design requires in whole hole, cleaning at the bottom of hole should be carried out immediately, it is to avoid every time long so that mud sediment,
Cause borehole collapse.For friction pile when hole wall easily caves in, it is desirable to before pouring underwater concrete, sediment thickness is not more than
30cm；When hole wall is difficult to cave in, no more than 20cm.For stanchion, it is desirable at jetting or before penetrating wind, sediment thickness is not more than
5cm.Clear hole method is the rig difference and flexible Application used.Generally can use direct circulation rotary rig, reacting cycle whirler
Vacuum-cleaner dredge and take out the clear hole such as slag cylinder.Wherein with the clear hole of suction dredge, equipment needed thereby is few, and easy to operate, clear hole is the most thorough
The end, but should use cautiously in unstable soil layer.Its principle is exactly to be blown into suction dredge pipeline with the pressure-air that compressor produces
Interior by body refuse blowout.
(7) pouring underwater concrete
After clear complete hole, so that it may prefabricated steel reinforcement cage is vertically hung onto in hole, to be fixed behind location, then with leading
Pipe concrete perfusion, during perfusion, concrete does not interrupt, and pile breaking phenomenon the most easily occurs.
For conventional geological conditions, no matter impact holing or other pore-forming modes all can complete to bore according to above-mentioned steps
Hole pouring pile is constructed, but, for complex geological condition, during utilizing the impact drilling, spillage easily occurring, spillage is serious
May directly result in hole wall collapse, affect normal construction, even cause the situation of brill, to construction enterprises due to hole wall collapse
Bringing loss, and extend construction period, therefore, a kind of impact under complex geological condition of exploitation is bored at cast-in-situ bored pile spillage
Reason method is this area urgent problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide impact under a kind of complicated geological and bores cast-in-situ bored pile spillage process side
Method, judges spillage degree when spillage by the slippage of mud in unit interval endoporus, according to different spillage degree choosings
Select different methods of disposal, geology cavity at spillage is blocked, and forms solid mud off, effectively control spillage existing
As, it is ensured that the normal construction of cast-in-situ bored pile.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the impact drilling under a kind of complicated geological
Bored concrete pile spillage processing method, comprises the steps:
The first step: judging that spillage degree, spillage degree are divided into slight spillage and serious spillage, slight spillage refers to half little
Time endoporus in mud slippage less than 1-3 rice, serious spillage refer to endoporus half an hour in mud slippage more than 3 meters；
Second step: spillage processes, and spillage degree is slight spillage, then supplement mud in hole, continue boring, or in hole
Backfill clay to mud upper surface recovers to elemental height to continue boring；Spillage degree is serious spillage, then put in hole
Slabstone and cement to mud recover to elemental height to continue boring, if mud has all leaked in hole, then put into sheet in hole
Impact is used to bore impact after stone and cement, until after slabstone embeds retaining wall, injecting mud, redrilling in hole.
3rd step: pore-forming, after second step processes, persistently mud height in detection hole, occurred before pore-forming again
Spillage, processes according to second step the most again, spillage does not occurs, then carried out clear hole, descending reinforcing cage and coagulation before pore-forming
Soil perfusion.
Described second step also includes when in double process metapore, mud still at short time light leak, then backfills in hole
Clay, backfill clay uses impact to bore redrilling after compacting.
In serious spillage in the described first step is additionally included in endoporus half an hour, mud has all leaked.
Beneficial effects of the present invention is as follows: judge spillage when spillage by the slippage of mud in unit interval endoporus
Degree, selects different methods of disposal according to different spillage degree, and for slight spillage, the present invention takes backfill in hole viscous
The processing method of soil, at clay backfilling to spillage, by increasing capacitance it is possible to increase mud balance, increase mud viscosity, to geology cavity at spillage
Block, and form solid mud off, effectively control spillage phenomenon；For serious spillage, take to backfill in boring
Clay, and backfill the methods such as a large amount of slabstone, cement, concrete, it is backfilled to spillage position, uses drill hammer to impact, right
At spillage, cavity carries out closure extruding, effectively controls spillage phenomenon, is prevented effectively from and causes sending out of hole wall collapse accident because of spillage
Raw, reduce construction cost, shorten construction period.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further detailed explanation.
In sum, the invention discloses impact under a kind of complicated geological and bore cast-in-situ bored pile spillage processing method, it is special
Levy and be: comprise the steps:
The first step: judging that spillage degree, spillage degree are divided into slight spillage and serious spillage, slight spillage refers to half little
Time endoporus in mud slippage less than 1-3 rice, serious spillage refer to endoporus half an hour in mud slippage more than 3 meters, seriously leak
In slurry is additionally included in endoporus half an hour, mud has all leaked；
Second step: spillage processes, and spillage degree is slight spillage, then supplement mud in hole, continue boring, or in hole
Backfill clay to mud upper surface recovers to elemental height to continue boring；Spillage degree is serious spillage, then put in hole
Slabstone and cement to mud recover to elemental height to continue boring, if mud has all leaked in hole, then put into sheet in hole
Using impact to bore impact after stone and cement, until after slabstone embeds retaining wall, injecting mud, redrilling in hole, also including working as
In double process metapore, mud is still at short time light leak, then backfill clay in hole, and backfill clay uses impact to bore and rams
Redrilling after reality.
3rd step: pore-forming, after second step processes, persistently mud height in detection hole, occurred before pore-forming again
Spillage, processes according to second step the most again, spillage does not occurs, then carried out clear hole, descending reinforcing cage and coagulation before pore-forming
Soil perfusion.
Using the applicant's experimental data in certain engineering, as embodiment, the present invention is described in detail below.
This engineering geological condition is as follows: top layer is the constructing soil about 0.4-4 rice, and the soil is porous；Middle level is gravelly sand, cobble
Layer, sandy gravel stratum: in close, moist, soil property is uneven, is distributed continuous mineralogical composition based on quartz, Anhydrite, and Muscovitum takes second place, and opaque glues
Soil content is relatively big, and granule psephicity is poor, and in Pedicellus et Pericarpium Trapae shape, sorting is good, and grating is general, and containing cobble, distribution is discontinuous, creeps into leakage
Water, hole wall easily caves in.Boulder bed: in close--closely knit, cobble composition is based on sandstone, and containing a small amount of limestone, sorting is preferable, grating
Typically, in secondary Pedicellus et Pericarpium Trapae shape, charges are based on silty clay, and dust stone takes second place, and creeps into difficulty, leaks, and easy collapse hole falls at the bottom of stake
On mud stone or sandstone, minority basement rock weak intercalated layer, there is empty and small-sized solution cavity, easy spillage.Overall geological conditions is more complicated,
Special, loosen in top layer, and bottom is hard, middle level slightly pine easily liquefaction.
During pile foundation construction, one has 14 pile bases and occurs that spillage, spillage total degree are 35 times, and slight spillage pile foundation is leaked
Slurry number of times is 14 times, and the pile foundation of serious spillage is 21 times, and the spillage degree of depth all has generation at 6-30 rice, for preventing drilled pile
Collapse hole situation, actively takes to backfill clay, slabstone, and the measure such as cement and concrete processes, and backfill clay amounts is 611
Side, backfill slabstone quantity is 190 sides, cement 3 tons, and concrete seven side obtains good result, is summarized as follows: processing method data are such as
Following table.
(1), slight spillage processing method:
Take to backfill clay treatment method in hole, be backfilled at spillage, increase mud balance, increase mud viscosity, right
At spillage, geology cavity blocks, and forms solid mud off, effectively controls spillage phenomenon.
(2), serious spillage processing method:
Take to backfill clay in boring, and backfill the methods such as a large amount of slabstone, cement, concrete, be backfilled to spillage position,
Using drill hammer to impact, at spillage, cavity carries out closure extruding, increases mud viscosity, forms solid mud off,
Effectively control spillage phenomenon.
Following table be this engineering occur during bored pile construction spillage pile foundation process data:
Table 1:
In a word, the present invention judges spillage degree when spillage by the slippage of mud in unit interval endoporus, according to
Different spillage degree selects different methods of disposal, and for slight spillage, the present invention takes to backfill the process of clay in hole
Method, at clay backfilling to spillage, by increasing capacitance it is possible to increase mud balance, increase mud viscosity, blocks geology cavity at spillage,
And form solid mud off, effectively control spillage phenomenon；For serious spillage, take to backfill clay in boring, and return
Fill out the methods such as a large amount of slabstone, cement, concrete, be backfilled to spillage position, use drill hammer to impact, to cavity at spillage
Carry out closure extruding, effectively control spillage phenomenon, be prevented effectively from the generation causing hole wall collapse accident because of spillage, reduce construction
Cost, shortens construction period.
Claims (3)
1. under a complicated geological, cast-in-situ bored pile spillage processing method is bored in impact, it is characterised in that: comprise the steps:
The first step: judging that spillage degree, spillage degree are divided into slight spillage and serious spillage, slight spillage referred within half an hour
In hole, mud slippage is less than 1-3 rice, and in serious spillage refers to endoporus half an hour, mud slippage is more than 3 meters；
Second step: spillage processes, and spillage degree is slight spillage, then supplement mud in hole, continue boring, or backfill in hole
Clay to mud upper surface recovers to elemental height to continue boring；Spillage degree is serious spillage, then put into slabstone in hole
Recover to continuing boring after elemental height with cement to mud, if mud has all leaked in hole, then put in hole slabstone and
Impact is used to bore impact after cement, until after slabstone embeds retaining wall, injecting mud, redrilling in hole.
3rd step: pore-forming, after second step processes, persistently mud height in detection hole, occurred spillage before pore-forming again,
The most again process according to second step, spillage did not occurred before pore-forming, then carry out clear hole, descending reinforcing cage and concrete and fill
Note.
Under complicated geological the most according to claim 1, cast-in-situ bored pile spillage processing method is bored in impact, it is characterised in that: institute
State second step also to include when in double process metapore, mud still at short time light leak, then backfills clay, backfill in hole
Clay uses impact to bore redrilling after compacting.
Under complicated geological the most according to claim 2, cast-in-situ bored pile spillage processing method is bored in impact, it is characterised in that: institute
State mud in the serious spillage in the first step is additionally included in endoporus half an hour all to have leaked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625832.1A CN106049467A (en) | 2016-08-02 | 2016-08-02 | Method for treating slurry leakage of bored pile through percussion drill under complex geology |
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| CN201610625832.1A CN106049467A (en) | 2016-08-02 | 2016-08-02 | Method for treating slurry leakage of bored pile through percussion drill under complex geology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938650A (en) * | 2017-12-22 | 2018-04-20 | 中交第三航务工程局有限公司宁波分公司 | The method for filling and treating of underground karst cavity |
| CN110528510A (en) * | 2019-08-26 | 2019-12-03 | 江苏省交通工程集团有限公司 | A kind of method that complicated geological carries out the processing of bottom hole spillage |
| CN114808931A (en) * | 2022-03-21 | 2022-07-29 | 中交二航局第一工程有限公司 | Leakage-stopping rod for leakage stopping of slurry of cast-in-situ bored pile on rubble dike in complex sea area |
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| CN1380470A (en) * | 2001-04-13 | 2002-11-20 | 河北省水利工程局 | Impervious wall construction and soilslip-resisting and leakage-blocking process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938650A (en) * | 2017-12-22 | 2018-04-20 | 中交第三航务工程局有限公司宁波分公司 | The method for filling and treating of underground karst cavity |
| CN110528510A (en) * | 2019-08-26 | 2019-12-03 | 江苏省交通工程集团有限公司 | A kind of method that complicated geological carries out the processing of bottom hole spillage |
| CN114808931A (en) * | 2022-03-21 | 2022-07-29 | 中交二航局第一工程有限公司 | Leakage-stopping rod for leakage stopping of slurry of cast-in-situ bored pile on rubble dike in complex sea area |
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