CN104746511A - Method for controlling quality of rotary excavating pile under water-rich sand layer condition - Google Patents
Method for controlling quality of rotary excavating pile under water-rich sand layer condition Download PDFInfo
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- CN104746511A CN104746511A CN201510149632.9A CN201510149632A CN104746511A CN 104746511 A CN104746511 A CN 104746511A CN 201510149632 A CN201510149632 A CN 201510149632A CN 104746511 A CN104746511 A CN 104746511A
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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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- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a method for controlling the quality of a rotary excavating pile under a water-rich sand layer condition. The method comprises the following steps that (1) high-viscosity slurry is prepared; (2) a protection cylinder is embedded, and a drilling machine is arranged in place; (3) drilling and hole forming are conducted on the upper portion of a sand layer, and the high-viscosity slurry is fed into a hole in the drilling process; (4) a slurry storage device is installed at the top of the pile, and the high-viscosity slurry is poured into the slurry storage device to the elevation of the designed liquid level; (5) a drilling bucket of the drilling machine penetrates through the slurry storage device and then slowly descends to the excavating surface; (6) the drilling bucket slowly cuts soil and drills in by a certain distance, idles in situ with dregs and then slowly ascends and discharges the dregs; (7) the step (5) and step (6) are repeated till the hole is formed in the lower portion of the sand layer. The method solves the problem that a drilling bit excessively scratches and disturbs when rotary excavating is carried out in the formed hole, and consequently hole collapse is caused; by means of the high-viscosity slurry which is reasonably prepared, the wall protection effect is improved, the movement of sand grains is also suppressed, the sand grains can be discharged out of the hole to the maximum, and the problem that the thickness of the sediment does not meet the requirement is solved.
Description
Technical field
The present invention relates to a kind of construction method in construction work research field, revolving particularly under a kind of rich water sand bed condition digs quality of pile control method.
Background technology
Present stage revolves the pile mode of digging stake routine: utilize red soil to size mixing or remaining mud pulping of holing carries out retaining wall, adopt conventional construction mode to carry out rotary dig drilling simultaneously, this kind of conventional pile mode hole wall retaining wall DeGrain, and drill bit easily carries out disturbance too much to hole wall, easily causes collapse hole.Under high water level rich water sand bed geological conditions, particularly more easily there is the problems such as collapse hole, sand content in mud are large, cause into porosity thus low, the large tripe of pile body, undergauge, slag inclusion, the quality problems such as pile bottom sediment thickness is blocked up.
From engineering construction result, the following problem of prior art ubiquity: 1, mud raw material are selected incorrect, mud mix-design is unreasonable, mud manufacturing process controls not pass a test, the mud viscosity of making and other parameter is made to be not suitable for using, hole wall cannot effectively form mud skin when rotary dig drilling pore-forming, does not have retaining wall effect; 2, during rotary dig drilling 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 of adding formation differs, and causes retaining wall poor effect.Under high water level drift sand formation geological condition, more easily cause the collapse hole in rotary dig drilling pore forming process; 3, mud property is poor, and mud balance is unreasonable; Special in passing through rich water sand bed geology, a considerable amount of sand is mixed in mud, affects mud sand content; 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, in rotary dig drilling pore forming process, slime water pressure head controls bad or not enough, causes and cannot suppress hole wall, cause collapse hole accident.
And adopt existing revolving to dig piling technique under rich water sand bed geological conditions, its shortcoming is more outstanding, be mainly manifested in following some: 1, existingly utilize red soil to size mixing or remaining mud pulping of holing carries out retaining wall, mud is difficult to effectively form 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, very easily collapse hole after rotary dig drilling disturbance.One time depth of cut is excessive, and disturbance hole wall area increases, and causes hole wall geology unstable, affects mud sand content; 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), the flowing of mud in stake holes can produce disturbance to hole wall, sometimes also can produce negative pressure, affect the stability of hole wall; 4, after each rotary dig drilling cuts soil, at once take slag and carry brill, easily cause the hole wall of new borehole section not close in time, hole wall Naked reveals so that mud can not form mud skin diaphragm 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, particularly under high water level rich water sand bed geology, more easily collapse hole accident occurs.
Summary of the invention
Object of the present invention, be to provide revolving under a kind of rich water sand bed condition to dig quality of pile control method, collapse hole phenomenon does not occur in work progress, and have effectively achieved to revolve and dig a pile concrete surfacing, closely knit, verticality and sediment thickness are met the requirements, without the need to piling.
The solution that the present invention solves its technical problem is: revolving under a kind of rich water sand bed condition digs quality of pile control method, comprises the following steps,
1) high viscosity mud is prepared;
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 to design liquid level absolute altitude toward storage sizing device;
5) drilling bucket of rig is slowly transferred to excavation face through 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 slag dumping at a slow speed;
7) step 5) and step 6) is repeated, until layer of sand bottom pore-forming.
As the further improvement of technique scheme, the mix proportion scheme of described high viscosity mud is: water: swell soil: C M C: soda ash=1000: 160: 3: 5, the use procedure of high viscosity mud is added a small amount of clay according to reality and is stirred, control 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, again stir before described high viscosity mud uses, detect configured high viscosity mud during use and whether reach requirement, otherwise, then raw material is added in high viscosity mud pit.
As the further improvement of technique scheme, after step 7), described drilling bucket exceeds after more than design elevation 30cm and stops creeping into, and rests 15 ~ 20 minutes, cleaning bottom after a 30cm at the bottom of exceeding after drill bit restarts.
As the further improvement of technique scheme, described storage sizing device is concrete pipe or steel pipe, makes slurry coat method liquid level higher than groundwater table more than 3 meters after the high viscosity mud in described storage sizing device.
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 iron nameplate every 30 ~ 45cm or indicates with red paint.
As the further improvement of technique scheme, in step 6), described drilling bucket is taken the idle running of slag original position and is referred to closedown drilling bucket lower end cover plate when drill bit reverses and keep taking 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), hoisting velocity or the decrease speed of described drill bit control at 0.3-4m/s.
As the further improvement of technique scheme, in step 3) or/and in step 6), during layer of sand excavation, the rotating speed of drilling bucket controls below 18s/ turns.
The invention has the beneficial effects as follows: the invention solves following problem, 1, drill bit is too swiped disturbance when solving rotary dig drilling pore-forming, 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 collapse hole problem in the rotary dig drilling pore forming process caused.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present invention, instead of whole embodiment, and those skilled in the art, under the prerequisite not paying creative work, can also obtain other design schemes and accompanying drawing according to these accompanying drawings.
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Be clearly and completely described below with reference to embodiment and the accompanying drawing technique effect to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.Obviously; described embodiment is a part of embodiment of the present invention, instead of whole embodiment, based on embodiments of the invention; other embodiments that those skilled in the art obtains under the prerequisite not paying creative work, all belong to the scope of protection of the invention.In addition, all connection/annexations mentioned in literary composition, not singly refer to that component directly connects, and refer to and according to concrete performance, can connect auxiliary by adding or reducing, and form more excellent draw bail.
With reference to Fig. 1, revolving under a kind of rich water sand bed condition digs quality of pile control method, comprises the following steps,
1) high viscosity mud 4 is prepared;
2) casing 5 is buried underground, driller insertion;
3) layer of sand 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 design liquid level absolute altitude toward storage sizing device 3;
5) drilling bucket 2 of rig is slowly transferred to excavation face through 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 slag dumping at a slow speed;
7) step 5) and step 6) is repeated, until layer of sand 6 bottom pore-forming.
Be further used as preferred embodiment, the mix proportion scheme of described high viscosity mud 4 is: water: swell soil: C M C: soda ash=1000: 160: 3: 5, high viscosity mud 4 use procedure is added a small amount of clay according to reality and is stirred, control high viscosity mud 4 unit weight between 1.25 ~ 1.35, viscosity is not less than 45s.During mud configuration, need about one time that left standstill add swell soil, cellulose (CMC), soda ash in mud pit after, after the complete hydration of swell soil, add clay more fully stir.Because caustic dosage is comparatively large to the viscosity influence of mud, first test water source pH value before preparation mud, then according to preparation order: water filling-Jia alkali-Jia swell soil and CMC prepare.By record material under actual geological conditions at the scene, determine best pH value (PH<8), make its macromolecule chain structure energy full extension join, make viscosity reach optimum value.
Be further used as preferred embodiment, front 1-2 hour is used again to stir at described high viscosity mud 4, detect configured high viscosity mud 4 during use and whether reach requirement, dig in whipping process and should note in the moment measuring each parameter value of mud, can stop after reaching engineering desirable value stirring, otherwise, then raw material is added in high viscosity mud 4 pond.
Be further used as preferred embodiment, after step 7), described drilling bucket 2 exceeds after more than design elevation 30cm and stops creeping into, and rests 15 ~ 20 minutes, cleaning bottom after a 30cm at the bottom of exceeding after drill bit restarts.
Be further used as preferred embodiment, described storage sizing device 3 is concrete pipe or steel pipe, makes slurry coat method liquid level higher than groundwater table more than 3 meters after the high viscosity mud 4 in described storage sizing device 3.Slurry position back-pressure hole creating technology is realized by arranging storage sizing device 3.Slurry position back-pressure hole creating technology adds storage sizing device 3(namely to erect with large diameter concrete pipe or steel pipe in upper end, stake position (ground), height more than 1.5 meters), to make slurry coat method liquid level can higher than groundwater table about 3 meters, make the slurry coat method pressure head of layer of sand 6 produce back-pressure effect higher than layer of sand 6 pressure head, reduce collapse hole probability with this.
Before drilling bucket 2 enters layer of sand 6, storage sizing device 3 is laid in upper end, stake position (ground), suit measures to local conditions when making storage sizing device 3, utilize project current material as far as possible, have employed existing large diameter concrete pipe and intercept making, size also will be more or less the same with casing 5 size simultaneously, and best bulk is at 10-20cm.The planeness absolute altitude of storage sizing device 3 controls consistent with burying casing 5 way underground.
Be 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.Controlling once to cut native drilling depth, is exactly the poor stability due to saturated sand 6, easy collapse hole after disturbance, revolve that to dig depth of cut excessive at every turn, then be unfavorable for the formation of excavation section pit protection mud cake, and form pit protection mud cake difficult quality guarantee, therefore need strict control to revolve at every turn and dig depth of cut.Through testing and verification: a depth of cut controls ensure better effects at 30 ~ 45cm, preventing affects layer of sand 6 stability because perturbation area is excessive and causes collapse hole, combine reality and geologic information by being commanded by technician and control drilling depth at drilling rod 1 scale label, guaranteeing in OK range.
Be further used as preferred embodiment, the drilling rod 1 of described rig arrange iron nameplate every 30 ~ 45cm or indicates with red paint.
Be further used as preferred embodiment, in step 6), described drilling bucket 2 is taken the idle running of slag original position and is referred to closedown drilling bucket 2 lower end cover plate when drill bit reverses and keep taking 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 is exactly after creeping at every turn and cutting soil, reversible type is closed drilling bucket 2 lower end cover plate and is kept 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 layer of sand 6 as far as possible.Make the mud cake on the wall of borehole of new borehole section fully can form diaphragm with this, ensure that newly cutting native sector hole wall energy closes in time, reduce the Naked dew of hole wall, in case collapse hole.
Be further used as preferred embodiment, in step 5) or/and in step 6), hoisting velocity or the decrease speed of described drill bit control at 0.3-4m/s.When drill bit promotes or declines, between mud and hole wall, flow velocity can produce disturbance to hole wall, sometimes also can produce negative pressure, affects the stability of hole wall.Therefore control to put forward brills, lower brill and rate of penetration and effectively can reduce disturbance to layer of sand 6 hole wall, drill bit promotes or decline should slowly, at the uniform velocity.Rising or falling speed controls at 0.3-4m/s.And layer of sand 6 is when excavating, drilling bucket 2 answers low pressure low speed to creep into, and rotating speed controls below 18s/ turns.Effectively can reduce the disturbance to layer of sand 6 hole wall by above-mentioned technology, prevent hole wall collapse.
Be further used as preferred embodiment, in step 3) or/and in step 6), when layer of sand 6 excavates, the rotating speed of drilling bucket 2 controls below 18s/ turns.
More than that better embodiment of the present invention is 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 prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (10)
1. revolving under rich water sand bed condition digs a quality of pile control method, it is characterized in that: comprise the following steps,
1) high viscosity mud is prepared;
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 to design liquid level absolute altitude toward storage sizing device;
5) drilling bucket of rig is slowly transferred to excavation face through 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 slag dumping at a slow speed;
7) step 5) and step 6) is repeated, until layer of sand bottom pore-forming.
2. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, it is characterized in that: the mix proportion scheme of described high viscosity mud is: water: swell soil: C M C: soda ash=1000: 160: 3: 5, the use procedure of high viscosity mud is added a small amount of clay according to reality and is stirred, control high viscosity volume weight of slurry between 1.25 ~ 1.35, viscosity is not less than 45s.
3. revolving under rich water sand bed condition according to claim 2 digs quality of pile control method, it is characterized in that: within 1-2 hour, again stir before described high viscosity mud uses, detect configured high viscosity mud during use and whether reach requirement, otherwise, then raw material is added in high viscosity mud pit.
4. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, it is characterized in that: after step 7), described drilling bucket exceeds after more than design elevation 30cm and stops creeping into, and rests 15 ~ 20 minutes, cleaning bottom after a 30cm at the bottom of exceeding after drill bit restarts.
5. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, it is characterized in that: described storage sizing device is concrete pipe or steel pipe, after the high viscosity mud in described storage sizing device, make slurry coat method liquid level higher than groundwater table more than 3 meters.
6. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, it is characterized in that: in step 6), and it is 30 ~ 45cm that described drilling bucket slowly cuts the certain distance that earth boring auger enters.
7. revolving under rich water sand bed condition according to claim 6 digs quality of pile control method, it is characterized in that: on the drilling rod of described rig, arrange iron nameplate every 30 ~ 45cm or indicate with red paint.
8. revolving under rich water sand bed condition according to claim 6 digs quality of pile control method, it is characterized in that: in step 6), described drilling bucket is taken the idle running of slag original position and is referred to, close 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. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, and it is characterized in that: in step 5) or/and in step 6), hoisting velocity or the decrease speed of described drill bit control at 0.3-4m/s.
10. revolving under rich water sand bed condition according to claim 1 digs quality of pile control method, it is characterized in that: in step 3) or/and in step 6), and during layer of sand excavation, the rotating speed of drilling bucket controls below 18s/ turns.
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| CN201510149632.9A CN104746511B (en) | 2015-03-31 | 2015-03-31 | Quality of pile control method is dug in rotation when a kind of rich water sand bed |
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| CN201510149632.9A CN104746511B (en) | 2015-03-31 | 2015-03-31 | Quality of pile control method is dug in rotation when a kind of rich water sand bed |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110326479A (en) * | 2019-06-28 | 2019-10-15 | 中国一冶集团有限公司 | A method of shrub training plant is carried out using matrix mud mixing pile method improvement sandy soil |
| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110326479A (en) * | 2019-06-28 | 2019-10-15 | 中国一冶集团有限公司 | A method of shrub training plant is carried out using matrix mud mixing pile method improvement sandy soil |
| 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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| CN104746511B (en) | 2016-07-06 |
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