CN104746511B - Quality of pile control method is dug in rotation when a kind of rich water sand bed - Google Patents

Quality of pile control method is dug in rotation when a kind of rich water sand bed Download PDF

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Publication number
CN104746511B
CN104746511B CN201510149632.9A CN201510149632A CN104746511B CN 104746511 B CN104746511 B CN 104746511B CN 201510149632 A CN201510149632 A CN 201510149632A CN 104746511 B CN104746511 B CN 104746511B
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sand bed
high viscosity
dug
rotation
quality
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CN104746511A (en
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刘佳武
文勉聪
陈文星
周志强
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GUANGZHOU XIEAN CONSTRUCTION ENGINEERING Co Ltd
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GUANGZHOU XIEAN CONSTRUCTION ENGINEERING Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds

Abstract

Quality of pile control method is dug in rotation when the invention discloses a kind of rich water sand bed, comprises the following steps, and 1) prepare high viscosity mud;2) casing is buried underground, driller insertion;3) layer of sand top drilling and forming hole, in boring procedure, high viscosity mud is sent in hole;4) storage sizing device is installed on stake top, pours into high viscosity mud extremely design liquid level absolute altitude toward storage sizing device;5) drilling bucket of rig is slowly transferred to excavation face after storage sizing device;6) drilling bucket is slowly cut earth boring auger and is entered certain distance, and after drilling bucket takes the idle running of slag original position, drilling bucket promotes at a slow speed slag dumping;7) step 5) and step 6) are repeated, until layer of sand bottom pore-forming.The invention solves problems with, 1, solve drill bit when churning driven enters pore-forming and too swipe disturbance, thus the collapse hole problem caused;2, the high viscosity mud of reasonable preparation, improves retaining wall effect, has also suppressed the motion of the grains of sand, makes the grains of sand substantially outside tap, can solve the undesirable problem of sediment thickness.

Description

Quality of pile control method is dug in rotation when a kind of rich water sand bed
Technical field
The present invention relates to a kind of construction method in architectural engineering research field, particularly rotation when a kind of rich water sand bed and dig quality of pile control method.
Background technology
The pile mode that present stage rotation digs stake conventional is: utilize red soil to size mixing or remaining mud pulping of holing carries out retaining wall, adopt conventional construction mode to carry out churning driven to enter simultaneously, pile mode hole wall retaining wall DeGrain this kind conventional, and hole wall easily carries out disturbance by drill bit too much, it is easy to cause collapse hole.Particularly it is more easy under high water level rich water sand bed geological conditions and the problems such as collapse hole, mud percent sand are big occur, thus cause into porosity low, the big tripe of pile body, undergauge, slag inclusion, the quality problems such as pile bottom sediment thickness is blocked up.
From engineering construction result, prior art ubiquity problems with: 1, mud raw material selects incorrect, mud mix-design is unreasonable, mud manufacturing process controls not pass a test, the mud viscosity made and other parameter is made to be not suitable for using, hole wall cannot be effectively formed mud skin when churning driven enters pore-forming, does not have retaining wall effect;2, when churning driven enters pore-forming, hole wall is subject to the scraping disturbance of drill bit, and mud skin is not easily formed, and the mud cortex amount adding formation differs, and causes retaining wall poor effect.Under high water level drift sand formation geological condition, it is easier to cause churning driven to enter the collapse hole in pore forming process;3, mud property is poor, and mud balance is unreasonable;Especially when passing through rich water sand bed geology, a considerable amount of sands are mixed in mud, affect mud percent sand;When sand content exceedes the scum silica frost ability of mud itself, grains of sand sediment is serious, very easily causes sediment thickness to exceed standard undesirable;4, churning driven enters in pore forming process slime water pressure head and controls bad or not enough, causes and cannot suppress hole wall, causes collapse hole accident.
And adopt existing rotation to dig piling technique under rich water sand bed geological conditions, its shortcoming is more prominent, be mainly manifested in following some: 1, existing utilizing red soil to size mixing or remaining mud pulping of holing carries out retaining wall, mud is difficult to be effectively formed mud skin, retaining wall weak effect, hole wall retaining wall DeGrain;2, under high water level rich water sand bed geological conditions, the poor stability of sand bed, enters after disturbance very easily collapse hole through churning driven.One time depth of cut is excessive, and disturbance hole wall area increases, and causes hole wall geology unstable, affects mud percent sand;Depth of cut is excessive, is unfavorable for the formation of excavation section pit protection mud cake, or forms pit protection mud cake difficult quality guarantee;3, when drill bit promotes (decline), hole wall can be produced disturbance by mud flowing in stake holes, sometimes also can produce negative pressure, affect the stability of hole wall;4, after each churning driven enters to cut soil, at once taking slag and carry brill, it is easy to cause the hole wall of new borehole section not close in time, hole wall reveals so that mud can not form mud skin protecting film fully, in time;5, work progress slime water pressure head controls bad or deficiency and causes and cannot suppress hole wall, easily causes collapse hole accident, is particularly easier to collapse hole accident under high water level rich water sand bed geology.
Summary of the invention
The purpose of the present invention, be in that to provide rotation when a kind of rich water sand bed to dig quality of pile control method, work progress do not occur collapse hole phenomenon, and have effectively achieved rotation dig a pile concrete surfacing, closely knit, perpendicularity and sediment thickness is made to meet the requirements, it is not necessary to piling.
This invention address that the solution of its technical problem is: quality of pile control method is dug in rotation when a kind of rich water sand bed, comprises the following steps,
1) high viscosity mud is prepared;
2) casing is buried underground, driller insertion;
3) sand bed top drilling and forming hole, in boring procedure, high viscosity mud is sent in hole;
4) storage sizing device is installed on stake top, pours into high viscosity mud extremely design liquid level absolute altitude toward storage sizing device;
5) drilling bucket of rig is slowly transferred to excavation face after storage sizing device;
6) drilling bucket is slowly cut earth boring auger and is entered certain distance, and after drilling bucket takes the idle running of slag original position, drilling bucket promotes at a slow speed slag dumping;
7) step 5) and step 6) are repeated, until sand bed bottom pore-forming.
Further improvement as technique scheme, the mix proportion scheme of described high viscosity mud is: water: bentonite: CMC: soda=1000: 160: 3: 5, high viscosity mud use procedure is added a small amount of clay according to reality and is stirred, controlling high viscosity volume weight of slurry between 1.25 ~ 1.35, viscosity is not less than 45s.
As the further improvement of technique scheme, within 1-2 hour, it is again stirring for before described high viscosity mud uses, during use, detects whether the high viscosity mud configured reaches requirement, otherwise, then in high viscosity mud pit, add raw material.
As the further improvement of technique scheme, after step 7), described drilling bucket stops creeping into beyond after designed elevation 30cm, rests 15 ~ 20 minutes, and drill bit clears up bottom after exceeding designed elevation 30cm after restarting.
As the further improvement of technique scheme, described storage sizing device is pipe of concrete or steel pipe, and the high viscosity mud in described storage sizing device makes slurry coat method liquid level higher than level of ground water more than 3 meters.
As the further improvement of technique scheme, in step 6), it is 30 ~ 45cm that described drilling bucket slowly cuts the certain distance that earth boring auger enters.
As the further improvement of technique scheme, the drilling rod of described rig arranges ferrum nameplate every 30 ~ 45cm or indicates with red paint.
As the further improvement of technique scheme, in step 6), described drilling bucket is taken closedown drilling bucket lower end cover plate maintenance when the idle running of slag original position refers to drill bit reversion and is taken slag original position idle running about 30s, and the idler revolutions of drill bit are not more than to creep into cuts earth boring auger speed.
As the further improvement of technique scheme, in step 5) or/and in step 6), the lifting speed of described drill bit or decrease speed control at 0.3-4m/s.
As the further improvement of technique scheme, in step 3) or/and in step 6), during sand bed excavation, the rotating speed of drilling bucket controls below 18s/ turns.
The invention has the beneficial effects as follows: the invention solves problems with, 1, solve drill bit when churning driven enters pore-forming and too swipe disturbance, thus the collapse hole problem caused;2, the high viscosity mud of reasonable preparation, improves retaining wall effect, has also suppressed the motion of the grains of sand, makes the grains of sand substantially outside tap, can solve the undesirable problem of sediment thickness;3, neighboring, hole pressure is solved higher than pressure in hole, thus the churning driven caused enters the collapse hole problem in pore forming process.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present invention, rather than whole embodiment, and those skilled in the art is under the premise not paying creative work, it is also possible to obtain other designs and accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Below with reference to embodiment and accompanying drawing, the technique effect of the design of the present invention, concrete structure and generation is clearly and completely described, to be completely understood by the purpose of the present invention, feature and effect.Obviously; described embodiment is a part of embodiment of the present invention, rather than whole embodiment, based on embodiments of the invention; other embodiments that those skilled in the art obtains under the premise not paying creative work, belong to the scope of protection of the invention.It addition, all connection/annexations being previously mentioned in literary composition, not singly refer to that component directly connects, and refer to and according to being embodied as situation, by adding or reduce connection auxiliary, more excellent draw bail can be formed.
With reference to Fig. 1, quality of pile control method is dug in rotation when a kind of rich water sand bed, comprises the following steps,
1) high viscosity mud 4 is prepared;
2) casing 5, driller insertion are buried underground;
3) sand bed 6 top drilling and forming hole, in boring procedure, high viscosity mud 4 is sent in hole;
4) storage sizing device 3 is installed on stake top, pours into high viscosity mud 4 to designing liquid level absolute altitude toward storage sizing device 3;
5) drilling bucket 2 of rig is slowly transferred to excavation face after storage sizing device 3;
6) drilling bucket 2 is slowly cut earth boring auger and is entered certain distance, and after drilling bucket 2 takes the idle running of slag original position, drilling bucket 2 promotes at a slow speed slag dumping;
7) step 5) and step 6) are repeated, until sand bed 6 bottom pore-forming.
It is further used as preferred embodiment, the mix proportion scheme of described high viscosity mud 4 is: water: bentonite: CMC: soda=1000: 160: 3: 5, high viscosity mud 4 use procedure is added a small amount of clay according to reality and is stirred, controlling high viscosity mud 4 unit weight between 1.25 ~ 1.35, viscosity is not less than 45s.During mud configuration, need after adding bentonite, cellulose (CMC), soda in mud pit to stand the about time, after bentonite is fully hydrated, adds clay is sufficiently stirred for.Owing to caustic dosage is relatively big to the viscosity influence of mud, before preparation mud, first test water source head pH value, further according to preparation order: water filling-Jia alkali-Jia bentonite and CMC prepare.By record material under actual geological conditions at the scene, it is determined that go out best pH value (PH < 8), make its macromolecule chain structure energy full extension join, make viscosity reach optimum.
It is further used as preferred embodiment, use within first 1-2 hour, be again stirring at described high viscosity mud 4, detect whether the high viscosity mud 4 configured reaches requirement during use, dig and whipping process should note in the moment measure each parameter value of mud, stirring can be stopped after reaching engineering desirable value, otherwise, raw material is added then in high viscosity mud 4 pond.
Being further used as preferred embodiment, after step 7), described drilling bucket 2 stops creeping into beyond after designed elevation 30cm, rests 15 ~ 20 minutes, and drill bit clears up bottom after exceeding designed elevation 30cm after restarting.
Being further used as preferred embodiment, described storage sizing device 3 is pipe of concrete or steel pipe, and the high viscosity mud 4 in described storage sizing device 3 makes slurry coat method liquid level higher than level of ground water more than 3 meters.Slurry position back-pressure hole creating technology is realized by arranging storage sizing device 3.Slurry position back-pressure hole creating technology is to add storage sizing device 3(namely to erect with the pipe of concrete of major diameter or steel pipe in upper end, stake position (ground), height more than 1.5 meters), so that slurry coat method liquid level can be higher than level of ground water about 3 meters, the slurry coat method pressure head making sand bed 6 produces back-pressure effect higher than sand bed 6 pressure head, reduces collapse hole probability with this.
Before drilling bucket 2 enters sand bed 6, storage sizing device 3 is laid in upper end, stake position (ground), the treatment in accordance with local conditions when making storage sizing device 3, utilize project current material as far as possible, have employed the pipe of concrete of existing major diameter and intercept making, size to be also more or less the same with casing 5 size simultaneously, it is desirable to bulk is at 10-20cm.The flatness absolute altitude of storage sizing device 3 controls consistent with burying casing 5 way underground.
Being further used as preferred embodiment, in step 6), it is 30 ~ 45cm that described drilling bucket 2 slowly cuts the certain distance that earth boring auger enters.Control once to cut soil drilling depth, it is simply that due to the poor stability of full water sand bed 6, easy collapse hole after disturbance, it is excessive that depth of cut is dug in each rotation, then it is unfavorable for the formation of excavation section pit protection mud cake and formed pit protection mud cake difficult quality guarantee, therefore needs strict control rotation every time to dig depth of cut.Through testing and verification: a depth of cut controls to can guarantee that better effects at 30 ~ 45cm, prevent affects sand bed 6 stability and causes collapse hole because perturbation area is excessive, by being commanded combination reality and geologic information by technical staff and controlling drilling depth at drilling rod 1 scale label, it is ensured that in OK range.
It is further used as preferred embodiment, the drilling rod 1 of described rig arranges ferrum nameplate every 30 ~ 45cm or indicates with red paint.
Being further used as preferred embodiment, in step 6), described drilling bucket 2 is taken closedown drilling bucket 2 lower end cover plate maintenance when the idle running of slag original position refers to drill bit reversion and is taken slag original position idle running about 30s, and the idler revolutions of drill bit are not more than to creep into cuts earth boring auger speed.The drill bit original position adopted takes slag idle running, postpone tap cinder construction technology exactly after creeping into every time and cutting soil, reversible type is closed drilling bucket 2 lower end cover plate and keeps taking slag original position idle running about 30s, should strict controlled drilling rate during drill free, the rotating speed of drill bit is not more than to creep into cuts earth boring auger speed, to reduce the disturbance to periphery sand bed 6 as far as possible.Protecting film can be sufficiently formed with the mud cake on the wall of borehole that this makes new borehole section, it is ensured that fresh cut soil sector hole wall energy is closed in time, reduce the dew of hole wall, in case collapse hole.
It is further used as preferred embodiment, in step 5) or/and in step 6), the lifting speed of described drill bit or decrease speed control at 0.3-4m/s.When drill bit promotes or declines, between mud and hole wall, hole wall can be produced disturbance by flow velocity, sometimes also can produce negative pressure, affect the stability of hole wall.Therefore controlling to put forward brill, lower brill and rate of penetration and can effectively reduce the disturbance to sand bed 6 hole wall, drill bit promotes or declines should slowly, at the uniform velocity.Rising or falling speed controls at 0.3-4m/s.And sand bed 6 is when excavating, drilling bucket 2 answers low pressure low speed to creep into, and rotating speed controls below 18s/ turns.It is effectively reduced the disturbance to sand bed 6 hole wall, it is prevented that hole wall collapse by above-mentioned technology.
It is further used as preferred embodiment, in step 3) or/and in step 6), when sand bed 6 excavates, the rotating speed of drilling bucket 2 controls below 18s/ turns.
It is above the better embodiment of the present invention has been illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the premise without prejudice to spirit of the present invention, and these equivalent modification or replacement are all contained in the application claim limited range.

Claims (10)

1. quality of pile control method is dug in a rotation when rich water sand bed, it is characterised in that: comprise the following steps,
1) high viscosity mud is prepared;
2) casing is buried underground, driller insertion;
3) sand bed top drilling and forming hole, in boring procedure, high viscosity mud is sent in hole;
4) installing storage sizing device on stake top, described storage sizing device is pipe of concrete or steel pipe, pours into high viscosity mud extremely design liquid level absolute altitude toward storage sizing device;
5) drilling bucket of rig is slowly transferred to excavation face after storage sizing device;
6) drilling bucket is slowly cut earth boring auger and is entered certain distance, and after drilling bucket takes the idle running of slag original position, drilling bucket promotes at a slow speed slag dumping;
7) step 5) and step 6) are repeated, until sand bed bottom pore-forming.
2. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterized in that: the mix proportion scheme of described high viscosity mud is: water: bentonite: CMC: soda=1000: 160: 3: 5, high viscosity mud use procedure is added a small amount of clay according to reality and is stirred, controlling high viscosity volume weight of slurry between 1.25 ~ 1.35, viscosity is not less than 45s.
3. quality of pile control method is dug in rotation when rich water sand bed according to claim 2, it is characterized in that: within 1-2 hour, be again stirring for before described high viscosity mud uses, detect whether the high viscosity mud configured reaches requirement during use, otherwise, then in high viscosity mud pit, add raw material.
4. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterized in that: after step 7), described drilling bucket stops creeping into beyond after designed elevation 30cm, rests 15 ~ 20 minutes, and drill bit clears up bottom after exceeding designed elevation 30cm after restarting.
5. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterised in that: the high viscosity mud in described storage sizing device makes slurry coat method liquid level higher than level of ground water more than 3 meters.
6. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterised in that: in step 6), it is 30 ~ 45cm that described drilling bucket slowly cuts the certain distance that earth boring auger enters.
7. quality of pile control method is dug in rotation when rich water sand bed according to claim 6, it is characterised in that: on the drilling rod of described rig, ferrum nameplate it is set every 30 ~ 45cm or indicates with red paint.
8. quality of pile control method is dug in rotation when rich water sand bed according to claim 6, it is characterized in that: in step 6), described drilling bucket is taken the idle running of slag original position and is referred to, closing drilling bucket lower end cover plate during drill bit reversion and keep taking slag original position idle running about 30s, the idler revolutions of drill bit are not more than to creep into cuts earth boring auger speed.
9. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterised in that: in step 5) or/and in step 6), the lifting speed of described drill bit or decrease speed control at 0.3-4m/s.
10. quality of pile control method is dug in rotation when rich water sand bed according to claim 1, it is characterised in that: in step 3) or/and in step 6), during sand bed excavation, the rotating speed of drilling bucket controls below 18s/ turns.
CN201510149632.9A 2015-03-31 2015-03-31 Quality of pile control method is dug in rotation when a kind of rich water sand bed Active CN104746511B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110326479B (en) * 2019-06-28 2022-03-22 中国一冶集团有限公司 Method for cultivating trees and shrubs by improving sandy soil through matrix mud stirring pile method
CN111851475A (en) * 2020-07-07 2020-10-30 中建三局集团有限公司 MPJ construction method for cast-in-place pile construction

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JPH09302663A (en) * 1996-05-16 1997-11-25 Shimizu Corp Construction method of cast-in place pile
CN101353894A (en) * 2008-08-28 2009-01-28 中国海洋石油总公司 Filling pile construction pore-creating method of pervious ultra-deep loose backfill two-piece stone zone
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