CN103046568A - Long spiral down-the-hole hammer vibrating jet grouting cement soil curtain pile construction process - Google Patents
Long spiral down-the-hole hammer vibrating jet grouting cement soil curtain pile construction process Download PDFInfo
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- CN103046568A CN103046568A CN2012105096459A CN201210509645A CN103046568A CN 103046568 A CN103046568 A CN 103046568A CN 2012105096459 A CN2012105096459 A CN 2012105096459A CN 201210509645 A CN201210509645 A CN 201210509645A CN 103046568 A CN103046568 A CN 103046568A
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Abstract
Provided is long spiral down-the-hole hammer vibrating jet grouting cement soil curtain pile construction process. The process procedures include that staking positions are measured among constructed slope protection piles, and drilling machines are located; a long spiral down-the-hole hammer vibrating drill is adopted, an air compressor and a high-pressure pump are started for drilling, when the drill is lowered, air pressure is high and water pressure is low, and when the designed depth is reached, low air pressure and high water pressure are adopted for lifting the drill; the drill is lowered to the designed depth again, water is changed into cement slurry, by using a frequency converter, the drill is controlled to be rotated and lifted at designed speed to the designed height, the drill is lowered and lifted according to designed reciprocating times, the cement slurry is poured continuously until a cement soil curtain pile is finished, pressure air and high pressure water are closed, and the drill is moved to conduct construction of next pile. The long spiral down-the-hole hammer vibrating jet grouting cement soil curtain pile construction process has the advantage that the hard soil layers can be drilled, especially when large gravel cobbles, rock blocks, boulders or underground concrete obstacles are encountered, by meshing pile bodies, closed and continuous pile walls can be formed, and reliability of water-sealing (water separation or water interception) curtains is improved.
Description
Technical field
The present invention relates to a kind of long spiral down-hole hammer vibration churning cement-soil curtain pile and construction technology thereof, belong to pit curtain water-stopping method (comprising subway foundation pit) in the building foundation construction.Can form the piling wall body, be used for sealing (water proof or intercept water) curtain and slope protection pile or its female stake, in the Fu Shui stratum, excavation of foundation pit is precipitation not.The stratum scope that the present invention adapts to is wide, at northern area than hardpan for example in the Compact sandy-pebble stratum, especially when running into large ovum gravel, piece stone, erratic boulder or running into the underground concrete obstacle, more aobvious its advantage.
Background technology
Cement mixing method is because its easy construction, with low cost, and be widely used in the fields such as pattern foundation pit supporting structure, water-stop curtain and ground processing, but traditional agitation pile is constructed than hardpan under the existing equipment condition, is extremely restricted, and especially stirs layer of sand or sand pebble layer and can't implement especially.Cement-soil rotary churning pile (comprising single tube, two-tube and three pipes) is although the application of also succeeding in fields such as Soft Deep Foundation Pit supporting, water-stop curtain and ground processing, but when constructing than hardpan, be extremely restricted equally, especially run into layer of sand or sand pebble layer and can't implement equally.
Long-auger jet-grouting agitation pile technology preferably resolves pan soil area pore-forming problem, at present in Beijing, the ground such as Hebei, Shandong, Yunnan, Inner Mongol better used, facts have proved that it is the technology of a practical, the stake footpath that can reach design is long with the stake that designs.Especially deep at foundation ditch or design stake utilizes the long-auger jet-grouting agitation pile than the easier assurance stake of long spiral agitation pile footpath, also easier guarantor's interlock effect when longer.
Present SMW(Soil-cement Wall) engineering method extensive use in the supporting of Soft Deep Foundation Pit sealing with its energy-conserving and environment-protective reliable in quality, its technique of design and construction also reaches its maturity, comprising that shaped steel rises pulls out recovery technology and also becomes ripe, and the foundation pit supporting project shaped steel rate of recovery generally can reach 100%.Three axle mixer plant capacities are large, and efficient is high, and construction depth is large, and reliable in quality is used also increasingly extensive.But application is also very limited on the pan soil stratum as the Beijing area, up to the present, adopts three axle mixers construction cement soil continuous wall to adopt steel pipe inner supporting that a case is only arranged in the Beijing area, and does not relate to Pekinese's sand-pebble layer.
When running into large ovum gravel, piece stone, erratic boulder or running into the underground concrete obstacle, the long screw auger tool is just helpless.For example in the curtain work progress of station, No. 7 line the ancient philosophers gulfs of Beijing Metro, run into diameter and cross foundation ditch greater than the reinforced concrete sewage pipe of 1.0m, buried depth 4m, excavated by manual work is except difficulty, Churn drill construction meeting impacts executing fender post, such as this position curtain pile of can not constructing, then curtain just can not be closed, do not reach the purpose of making curtain.
Summary of the invention
In order to overcome the deficiency of above technology, the invention provides a kind of long spiral down-hole hammer vibration churning cement-soil curtain pile foundation ditch water-stopping method.
Technical scheme of the present invention is: a kind of long spiral down-hole hammer vibration churning cement-soil curtain pile construction technology, and it is characterized in that: its technological process is: measure fixed pile between the slope protection pile executing, rig is in place; Adopt long spiral down-hole hammer vibration drilling tool, start air compressor machine and high-pressure pump water creeps into, high blast during lower brills, hang down hydraulic pressure, reach projected depth and still adopt on low blast, the high hydraulic pressure and carry; Again descend drilling to completion, with water switch to cement paste utilize Frequency Converter Control at the design speed rotary lifting to design height, undertaken descending by the round number of times of design again and on carry and continuous injected water mud, until finish a cement-soil curtain pile, closing presure wind and water under high pressure, telephone-moving carry out next pile construction.
Utilize long spiral down-hole hammer vibration drilling tool more can adapt to the characteristics of the especially underground hard thing of hard formation, be arranged in and execute between the slope protection pile, seal to greatest extent the space between two slope protection pile.
Formed foundation ditch water-stop body cording has certain impermeability, can realize not dewatering construction, the protection groundwater resources.
Described long spiral down-hole hammer vibration drilling tool comprises hollow drill, water under high pressure mud pipe, down-hole hammer air inlet duct, nozzle and pneumatic down hole hammer, upper end at the coaxial connection pneumatic down hole hammer in the lower end of hollow drill, axle center in hollow drill is provided with water under high pressure mud pipe, around water under high pressure mud pipe, be provided with several down-hole hammer air inlet ducts, be connected with several radial branching pipes at water under high pressure mud pipe, each branched pipe all be located at the hollow drill tube wall on nozzle be connected.
Advantage of the present invention is: this invention can be crept in than hardpan, especially when running into large ovum gravel, piece stone, erratic boulder or running into the underground concrete obstacle, reach projected depth and stake footpath, by interlock between the pile body, can form closed continuous piling wall body, thereby improve the reliability of sealing (water proof or intercept water) curtain.
Description of drawings
Fig. 1 is the long spiral down-hole hammer vibration of the present invention churning cement-soil curtain pile construction flow chart;
Fig. 2 is the pile hole construction sequential schematic;
Fig. 3 is the structural representation of the drilling tool that adopts of the present invention;
Fig. 4 is the A-A sectional view of Fig. 3;
Fig. 5 is the B-B sectional view of Fig. 4.
The specific embodiment
Referring to Fig. 1 and Fig. 2, the long spiral down-hole hammer vibration drilling tool that process using of the present invention has been transformed changes the long screw auger tool into polished rod vibration drilling tool, or is with discontinuous helical blade; Its drill bit is the bore bit in pneumatic down hole hammer band spray wind hole, establishes gunniting hole above down-hole hammer; The position perforate of long-spiral drilling machine unit head or bend part connect Grouting Pipe appendix simultaneously, and the junction arranges single acting device; Slip casting is equipped with cement paste grouting pump, grout-stirring barrel reciprocating sieve and slurry storing tank, High-Pressure Compressor etc.
Referring to Fig. 3-Fig. 5, the long spiral down-hole hammer vibration drilling tool that the present invention adopts comprises hollow drill 11, water under high pressure mud pipe 12, down-hole hammer air inlet duct 13, whitewashing mouth 14 and pneumatic down hole hammer 15, upper end at the coaxial connection pneumatic down hole hammer 15 in the lower end of hollow drill 11, axle center in hollow drill 11 is provided with water under high pressure mud pipe 12, around water under high pressure mud pipe 12, be provided with several down-hole hammer air inlet ducts 13, be connected with several radial branching pipes at water under high pressure mud pipe 12, each branched pipe all be located at hollow drill 11 tube walls on whitewashing mouth 14 be connected.
This drilling tool is applicable to harder sand-pebble layer, during work, pneumatic down hole hammer 15 is by the blast hole making by vibration, in the process of high-pressure mortar spraying mouth 14 along with pneumatic down hole hammer 15 decline pore-formings on pneumatic down hole hammer 15 tops, to around churning water under high pressure mud, form soil-cement body with the soil body around the hole.
Describe in detail below in conjunction with specific embodiment.
Preparation of construction:
1) data collection, executing well site is made an on-the-spot survey, and conscientiously writes Design of Construction Organization;
2) underground ground, job site obstruction is carried out necessary cleaning, and do the smooth of place well, the Reasonable Arrangement field type facility is guaranteed normal construction.
3) raw-material preparation:
(1) material of all uses should meet design and GB and terrestrial reference regulation;
(2) cement must possess the outgoing certificate, tackles when stocking up to carry out an acceptance inspection in its kind, label, packing, the date of production etc., and stores by pertinent regulations; 200 tons of cement of every supply must the sampling censorship.Submitted sample respectively takes a morsel from 10 bags.H shaped steel must provide the quality certificate that dispatches from the factory.
(3) carry out in accordance with regulations each about raw-material sampling and test job, guarantee raw-material quality.
4) plant equipment and auxiliary equipment: the long screw auger tool of having transformed, cement paste manufacturing system equipment, tracklaying crane, hydraulic actuated excavator, air compressor etc.
Measure the unwrapping wire fixed pile
Measure the unwrapping wire fixed pile at smooth location, guide pile is carried out with measuring apparatus in two ends, prevents from checking at any time when deviation from appearring in the stake position; Fixed pile is normally made a call to a deep hole on the ground with drill rod or card punch, pours into the albarium powder, and the distinguishing marks such as reinforcing rod are plugged at the place in the stake position.
Rig location, boring, telephone-moving
Operating personnel strictly control the movement of rig pile frame according to the position of determining, the axle center of guaranteeing to hole is in place not inclined to one side, and it is vertical to utilize two hammer methods to adjust drill collars, and the perpendicularity deviation that guarantees drilling tool is within 0.5% scope.Drilling depth is up to standard under the while keyhole, utilizes drilling rod and pile frame relative displacement principle, marks the scale line of drilling depth at drilling pipe.
Rig moves along the bracing of foundation pit axis, adopts the method for sequence of construction schematic diagram, once construction between the 1st, 3,5 fender posts, and order is the 2nd → 4 among Fig. 2 ...Circulate successively and go along with sb. to guard him pile body and become diaphragm wall type water-stop curtain.
Creep into and churning
According to the designing institute mark degree of depth, rig is at hole making by vibration and promote in the overall process uniform rotation of maintenance drilling rod, at the uniform velocity lower boring at the uniform velocity promotes, and takes high-pressure jet that cement-soil is stirred and mix and stir, guarantee whole stake mix fully, evenly, guarantee to vibrate the churning quality of pile.
1) preparation of cement paste: according to Different Strata, groundwater table, select dissimilar cement, determine different water/binder ratio, final water/binder ratio should be determined by designing requirement and field trial, water/binder ratio is optional 1.0 ~ 1.5 generally speaking, can add an amount of additive according to actual conditions in addition.
2) determine to put forward running speed according to soil layer, water level situation, utilize in advance frequency converter that it is regulated.Limit vibration (rig is that long spiral is combined with pneumatic down hole hammer) churning is bored under the limit, reaches the churning of projected depth after vibration and promotes (churning can be repeated repeatedly to vibrate up and down in the position, aquifer) until the position, aperture.Full hole section up-down vibration churning repeatedly can make full hole soil-cement body more even.Slurries pressure control 20 ~ 30MPa, the slurry flow basis is crept into actual speed, underground soil properties situation is adjusted.Air-pressure controlling is at 1.5 ~ 2.5MPa.
4, specific embodiment
No. 7 line the ancient philosophers of Beijing Metro gulf erect-position is in former Beijing chemical industry two factory north sides (being planned to municipal greenery patches) in Guangqu Lu and junction of three roads southern side, coal machine making factory West Road, and is above the open drain, present situation half shop, east-west.
Station main body standard paragraphs is that double-deck twin columns three are striden box structure, and stride for double-deck four and five strides box structure, main body overall length 235m at the two ends place.The wide 21.1m of standard paragraphs, dark 16.3～16.7m, the wide 30.65m of west end shield structure well, dark 19.0m; An air channel foundation ditch length 61.8m, dark 16.7～16.9m.Fender post adopts two kinds of forms: Ф 800mm@1300mm bored pile and Ф 1000mm@1500mm bored pile are adopted in station main body and an air channel, apply Ф 900 long-auger jet-grouting stirring concrete earth piles between stake.Inner support adopts Ф 609 * 16 steel pipes, support interval 2.5～3.5m, and anchor cable is established in the part.
Typical stratum has in the foundation depth scope: 1. 1 layer of miscellaneous fill, the silt 1. layer that bankets, silt is layer 3., the powder fine sand
3 layers, the powder fine sand
3 layers, medium coarse sand
4 layers, circle gravel cobble is layer 5., medium coarse sand 5. 1, and silty clay is layer 6..
Shown in the underground water details sees the following form.
Efflux piling method and remedy running into to adopt can not lay situation the time to increase, only implement just to have increased by 85 piles in western termination, adopting the method obviously to exist increases cost, problem long in time limit, nonetheless, still has some stakes not lay.For example there is the concrete pipe diameter 1m that a north and south connects C488 stake position, and flows to again some concrete during the construction slope protection pile, so that this stake can't adopt said method to remedy.As not overcoming the situation of not going down, sealing does not just ensure.Simultaneously also because curtain pile runs under the obstacle and does not go, move after the slope protection pile and cause distance, can not with the effective interlock of slope protection pile, do not have the effect of sealing.Investigate by analysis, decision introduction pneumatic down hole hammer technology in long-auger jet-grouting agitation pile technology reaches and overcomes the purpose that underground hard thing reaches projected depth for this reason.
For realizing being connected of pneumatic down hole hammer and existing long-spiral drilling machine drilling tool for construction, investigate by analysis, selected the HTG360 model pneumatic down hole hammer of Tonghua permanent logical prosperous drilling machine Co., Ltd production, its external diameter is 136mm, overall length 1450mm, weight 126kg, blast 7 ~ 21kg/cm
2, blast consumption 8.5 ~ 25m
3, adapted drill bit diameter 203mm.Drilling rod is outer flat heavy wall drill pipe.In order to coordinate the function of down-hole hammer and churning, with the drilling rod bottom of designs of nozzles on down-hole hammer, in order to coordinate airduct and the position of starching pipe, the airduct import is located at the drilling rod side simultaneously, the slurry pipe is installed respectively single acting device with airduct, has guaranteed both normal operations.Being equipped with maximum quantity of wind is 24m
3, maximum wind pressure is the air compressor machine of 2.07MPa.
At L9 (3
4) orthogonal test determined on the basis of long-auger jet-grouting mixing pile construction parameter, carried out the parameters of construction technology test with down-hole hammer, three test piles with the Frequency Converter Control rising or falling speed have been designed respectively, adopted " three times slurries of three times water " technique, the drilling tool rising or falling speed is respectively 1.0m/min, 0.5m/min, 0.25m/min.Cutting depth reaches old soil, reaches respectively 3m, 4.5m and 7.5m, and the stake diameter is respectively 650mm, 1200mm and 1300mm.Determine that for this reason rising or falling speed is 0.5m/min.Pump pressure 20 ~ 24MPa bores large blast under blast 1.7 ~ 2.07MPa(, promote little blast), water/binder ratio 1.5.
Inaccurate in order to overcome the stake position, curtain pile is arranged in two slope protection pile center.This technique 150 curtain piles of in this engineering, having constructed.Because the application of down-hole hammer, can reach the degree of depth of design, effectively overcome common " jolterhead " " pregnant " defective of deposited reinforced concrete pile, overcome simultaneously underground ambiguous barriers, guaranteed that curtain pile implements smoothly.
Claims (4)
1. one kind long spiral down-hole hammer vibration churning cement-soil curtain pile construction technology, it is characterized in that: its technological process is: measure fixed pile between the slope protection pile executing, rig is in place; Adopt long spiral down-hole hammer vibration drilling tool, start air compressor machine and high-pressure pump water creeps into, high blast during lower brills, hang down hydraulic pressure, reach projected depth and still adopt on low blast, the high hydraulic pressure and carry; Again descend drilling to completion, with water switch to cement paste utilize Frequency Converter Control at the design speed rotary lifting to design height, undertaken descending by the round number of times of design again and on carry and continuous injected water mud, until finish a cement-soil curtain pile, closing presure wind and water under high pressure, telephone-moving carry out next pile construction.
2. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil curtain pile construction technology, it is characterized in that: utilize long spiral down-hole hammer vibration drilling tool more can adapt to the characteristics of the especially underground hard thing of hard formation, be arranged in and execute between the slope protection pile, seal to greatest extent the space between two slope protection pile.
3. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil curtain pile construction technology, and it is characterized in that: formed foundation ditch water-stop body cording has certain impermeability, can realize not dewatering construction, the protection groundwater resources.
4. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil curtain pile construction technology, it is characterized in that: described long spiral down-hole hammer vibration drilling tool comprises hollow drill, water under high pressure mud pipe, the down-hole hammer air inlet duct, nozzle and pneumatic down hole hammer, upper end at the coaxial connection pneumatic down hole hammer in the lower end of hollow drill, axle center in hollow drill is provided with water under high pressure mud pipe, around water under high pressure mud pipe, be provided with several down-hole hammer air inlet ducts, be connected with several radial branching pipes at water under high pressure mud pipe, each branched pipe all be located at the hollow drill tube wall on nozzle be connected.
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| CN2012105096459A CN103046568A (en) | 2012-12-04 | 2012-12-04 | Long spiral down-the-hole hammer vibrating jet grouting cement soil curtain pile construction process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105926626A (en) * | 2016-05-04 | 2016-09-07 | 北京建材地质工程公司 | Construction process for super-long vibration jet-grouting pile of pneumatic down-the-hole hammer, and equipment thereof |
| CN106481296A (en) * | 2016-09-30 | 2017-03-08 | 黑龙江省华岩桩工技术研发有限公司 | Water drilling apparatus and drilling method are sent in drilling ＆ grouting piling concrete stake |
| CN106996105A (en) * | 2016-08-25 | 2017-08-01 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts jet mixing pile constructing process and equipment |
| CN110344400A (en) * | 2019-07-17 | 2019-10-18 | 北京建材地质工程有限公司 | The hard rock pore-forming construction technology of churning driven opportunity |
| CN112411531A (en) * | 2020-11-17 | 2021-02-26 | 江西省水利科学研究院 | Rotary and percussion drilling and spraying integrated high-spraying process and device |
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| CN106481296A (en) * | 2016-09-30 | 2017-03-08 | 黑龙江省华岩桩工技术研发有限公司 | Water drilling apparatus and drilling method are sent in drilling ＆ grouting piling concrete stake |
| CN110344400A (en) * | 2019-07-17 | 2019-10-18 | 北京建材地质工程有限公司 | The hard rock pore-forming construction technology of churning driven opportunity |
| CN112411531A (en) * | 2020-11-17 | 2021-02-26 | 江西省水利科学研究院 | Rotary and percussion drilling and spraying integrated high-spraying process and device |
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Application publication date: 20130417 |