CN103015435A - Long auger down hole hammer vibration rotary-jet steel reinforced cement-soil pile foundation pit water-resisting and supporting method - Google Patents
Long auger down hole hammer vibration rotary-jet steel reinforced cement-soil pile foundation pit water-resisting and supporting method Download PDFInfo
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- CN103015435A CN103015435A CN2012105096618A CN201210509661A CN103015435A CN 103015435 A CN103015435 A CN 103015435A CN 2012105096618 A CN2012105096618 A CN 2012105096618A CN 201210509661 A CN201210509661 A CN 201210509661A CN 103015435 A CN103015435 A CN 103015435A
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Abstract
A long auger down hole hammer vibration rotary-jet steel reinforced cement-soil pile foundation pit water-resisting and supporting method is characterized in that an undisturbed soil layer is subjected to vibration, rotary jet, cutting and stirring on the spot by using the characteristics that a long auger down hole hammer vibration drilling tool is more adaptive to the hard formations, particularly underground hard objects, the undisturbed soil layer is stirred and filled with cement at the same time to the designed elevation, and then the drilling tool is pulled out, reinforced materials such as shape steel are inserted into the undisturbed soil layer to form columnar pile bodies with certain strength and anti-permeability performance; and columnar pile bodies, which are arrayed, are manufactured in sequence or at intervals to form a foundation pit water-resisting pile wall. The method has the advantages that the method is applicable to wide stratum ranges, particularly is more advantageous in the application to harder pans in northern areas, such as close sandy gravel stratums; the shape steel can be recycled, so that the cost of the foundation pit supporting construction is lowered greatly; an anchor rod or an inner support is recycled, so that the foundation pit supporting is more intensive and environmental-friendly; and through the occlusion of the pile bodies, a closed and continuous pile wall body is formed, so that the reliability of the waterproof (water-resisting or water-intercepting) curtain is improved.
Description
Technical field
The invention belongs to foundation pit supporting method (comprising subway foundation pit) in the building foundation construction, be particularly related to long spiral down-hole hammer vibration churning cement-soil Section-steel Piles and construction technology thereof, the piling wall body be can form, sealing (water proof or intercept water) curtain and slope protection pile or its female stake are used for.The stratum scope that the present invention adapts to is wide, especially at northern area than hardpan more aobvious advantage in the application on Compact sandy-pebble stratum for example.
Background technology
Present SMW(Soil-cement Wall) engineering method with its energy-conserving and environment-protective reliable in quality in the soft clay area extensive use, 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.
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.The cement-soil rotary churning pile comprises single tube, two-tube and three pipes, the application although also succeed 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 it is the technology of a practical, the stake that can reach the stake footpath of design and design is long, is equipped with inner support or anchor pole and carries out pattern foundation pit supporting structure and can realize fully if utilize the continuous curtain wall of this technology construction to insert shaped steel.Especially when cheating dark or designing pile length, utilize the long-auger jet-grouting agitation pile just than the easier assurance stake of long spiral rotary agitation pile footpath, also easier assurance verticality and interlock effect.
But 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 seal, and does not reach the purpose of making curtain.At this moment the ability of passing concrete pipe of pneumatic down hole hammer just necessitates.
Summary of the invention
In order to overcome the deficiency of above technology, utilize the existing long screw auger tool of having transformed, invented a kind of long spiral down-hole hammer vibration churning cement-soil Section-steel Piles base pit stand construction.
Technical scheme of the present invention is: a kind of long spiral down-hole hammer vibration churning cement-soil Section-steel Piles foundation ditch sealing supporting method, 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, vibrate on the spot the churning cutting original state soil layer of stirring, mix limit, limit adds cement, after design elevation, extract drilling tool, insert the strength shaped materials such as shaped steel, form the column pile body with some strength and impermeability; Successively or interval construction make the column pile body of arrangement, form foundation ditch sealing piling wall.
Between the described column pile body mutually interlock form continuous closed piling wall, can form single interlock or arrange interlock more according to requirement of engineering, interlock mode employing order interlock or every the hole interlock.
Described cement-soil spray can be inserted the strength shaped materials such as shaped steel after stirring and finishing, and to increase the intensity of pile body, the strength shaped material can recycle and reuse.
After piling wall forms, adopt anchor pole and/or inner support to form compound foundation pit supporting system.
Formed foundation pit supporting system has certain impermeability, can realize not dewatering construction, the protection groundwater resources.
Described long spiral down-hole hammer vibration drilling tool is 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.
Advantage of the present invention is: the stratum scope of adaptation is wide, especially at northern area than hardpan more aobvious advantage in the application on Compact sandy-pebble stratum for example.Owing to the recyclable recycling of shaped steel, greatly reduce the cost of foundation pit support construction simultaneously; In addition owing to the dismounting of anchor pole or inner support is recycled, so that the more intensive environmental protection of pattern foundation pit supporting structure.Be applied in the Fu Shui stratum, excavation of foundation pit is precipitation not.This invention can be crept in than hardpan, reaches projected depth and stake footpath, by interlock between the pile body, can form closed continuous piling wall body, thereby has improved the reliability of sealing (water proof or intercept water) curtain; For the rigidity and the intensity that increase the piling wall body, cement earth pile forms the strength shaped materials such as rear insertion shaped steel, thereby guarantees that sealing is reliable, foundation ditch safety.
Description of drawings
Fig. 1 is the long spiral vibrating churning of the present invention cement-soil Section-steel Piles foundation ditch sealing supporting method construction flow chart;
Fig. 2 is the present invention's guide groove of excavating and structural representation of settling location shaped steel;
Fig. 3 is the schematic diagram that the present invention adopts the sequence construction pile hole;
Fig. 4 is the schematic diagram that the present invention adopts the construction pile hole that jumps;
Fig. 5 is the structural representation of the drilling tool that adopts of the present invention;
Fig. 6 is the A-A sectional view of Fig. 5;
Fig. 7 is the B-B sectional view of Fig. 6.
The specific embodiment
Referring to Fig. 1-Fig. 4, a kind of long spiral down-hole hammer vibration churning cement-soil Section-steel Piles foundation ditch sealing supporting method of the present invention, utilize long spiral down-hole hammer vibration drilling tool more can adapt to the characteristics of the especially underground hard thing of hard formation, vibrate on the spot the churning cutting original state soil layer of stirring, mix limit, limit adds cement, after design elevation, extracts drilling tool, insert the strength shaped materials such as shaped steel, form the column pile body with some strength and impermeability; Successively or interval construction make the column pile body of arrangement, form foundation ditch sealing piling wall.
Referring to Fig. 5-Fig. 7, 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.
Drilling tool of the present invention 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 cleared up, and done well smooth (three supplies and one leveling) in place, 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) the shaped steel welding cooperates welding with the 15T crawler crane, and mode adopts the shaped steel docking, and weld seam reaches the design specifications requirement, and the shaped steel welding is checked and accepted and taked side weld edge fit acceptance method.
(4) 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, 50t tracklaying crane, hydraulic actuated excavator, air compressor etc.
Measure unwrapping wire, excavation guide channel
1) at first measure unwrapping wire fixed pile and guiding ditch at smooth location, guide pile and guiding ditch are carried out with measuring apparatus in two ends, prevent 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.
2) excavation guide groove, arrangement location shaped steel (Fig. 2): according to bracing of foundation pit inner edge control line, adopt excavator or hand excavation's groove, and remove underground obstacle, groove dimensions and the following figure of location shaped steel, the remaining soil of excavation groove is in time processed, and is in place smoothly to guarantee rig.
Rig location, boring, telephone-moving
Guide-localization shaped steel 1 is laid in work groove 2 both sides at excavation, mark the position of bore position and slotting shaped steel at guide-localization shaped steel 1 by designing requirement, operating personnel strictly control the movement of rig pile frame according to the position of determining, the axle center (line 4) of guaranteeing to hole is in place not inclined to one side, 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 (referring to Fig. 2, the inner edge that mark 3 is gone along with sb. to guard him for pile body among the figure) of drilling depth at drilling pipe.
Rig moves along the bracing of foundation pit axis, adopts the method cover of sequence of construction schematic diagram to bore, and two kinds of methods all have its usable condition.Two kinds of method sequence of construction schematic diagrames are as follows.
Method (1) is job practices commonly used, and advantage is that speed of application is very fast, and order is 1 → 2 → 3 → 4 → 5, and the pile body of formation order interlock is referring to Fig. 3.
Method (2) needs to jump job practices commonly used when beating, and can avoid the skew of pile frame lateral force, and order is 1 → 3 → 5 → 2 → 4, and the formation order is every the pile body of hole (hole or porous) interlock, referring to Fig. 4.
Circulation is until the retaining wall moulding successively.The cement-soil rotary churning pile is that the inside and outside water proof of foundation ditch encloses curtain, does not allow during construction the cold seam of construction to occur, as 12 hours the cold seam of construction occurring surpassing, needs to adopt lap joint sleeve to bore or in rear row's piling.
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.Bore under the vibration churning limit on the limit, reaches the churning of projected depth after vibration and promote (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.
Shaped steel inserts
After the abundant mix of cement-soil of boring is even, before the beginning initial set sclerosis, adopt the DH500 pedrail crane that the shaped steel of scale is sling, insert assigned address, be inserted into the design code degree of depth under the deadweight of dependence shaped steel, in the time of can not reaching projected depth, start vibrating hammer, vibration is inserted, and then changes the method for colluding, make shaped steel break away from suspension hook, be fixed on the location shaped steel of laying the groove both sides until the cement-soil in the hole solidifies.Shaped steel is before inserting cement earth pile, and the surface should the brushing anti-friction agent.
Shaped steel is in order to reduce penetration resistance, and " point " shape is processed in the lower end, smears mold oil in the shaped steel outside simultaneously.With crane gear shaped steel is sling, utilized its deadweight to sink, in the time of can not reaching projected depth, start vibrating hammer, vibration is inserted, and takes during insertion reliable correcting measure to guarantee the verticality of shaped steel.Shaped steel can be H shaped steel, also can select other shaped steel according to the dark and stressed size in hole, such as i iron, channel-section steel, angle steel, round steel etc.Generally speaking, the shaped steel upper end exceeds top coupling beam a 0.5 ~ 1.0m, and punches at shaped steel, pulls out in order to rising.
Inner support or anchor bolt construction
According to the wide and soil layer situation of hole dell, conventional inner support or bolt support are adopted in design, and anchor pole adopts existing removable anchor pole.
The coupling beam construction of stake top
As adopt reinforced concrete coupling beams, and reinforcing bar binding should be avoided shaped steel, and shaped steel has been convenient to pull out dismounting with parcels such as foam and malthoids.As adopt prefabricated coupling beam, and then can after finishing its function, remove in the lump and reclaim, reuse.
Inner support or anchor pole are removed
When main building reaches certain phase, provisional pattern foundation pit supporting structure will lose its effect, can remove its inner support or anchor pole, and recycling, it is underground that the pattern foundation pit supporting structure anchor pole is no longer stayed, more environmental protection.
Shaped steel rises and pulls out recovery, recycling
After pit backfill is finished, shaped steel can be risen and pull out recovery, pulling tool can adopt special-purpose rising to pull out machine, or foundation ditch is when dark, shaped steel frictional force is little, and when the place was narrower again, available jack rose in advance and pulls out, after reaching a certain height, sling with crane gear, reclaim, recycling.Guarantee intensive environmental protection.
The cavity backfill
After shaped steel rises and pulls out, the cavity that stays, available water mud or cement grout are filled, and 1 ~ 2m scope in top seals with clay in case of necessity, guarantees can not flow into water.
Claims (6)
1. one kind long spiral down-hole hammer vibrates churning cement-soil Section-steel Piles foundation ditch sealing supporting method, 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, vibrate on the spot the churning cutting original state soil layer of stirring, mix limit, limit adds cement, after design elevation, extract drilling tool, insert the strength shaped materials such as shaped steel, form the column pile body with some strength and impermeability; Successively or interval construction make the column pile body of arrangement, form foundation ditch sealing piling wall.
2. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil Section-steel Piles foundation ditch sealing supporting method, it is characterized in that: mutual interlock forms continuous closed piling wall between the described column pile body, can form single interlock or arrange interlock more according to requirement of engineering, interlock mode employing order interlock or every the hole interlock.
3. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil Section-steel Piles foundation ditch sealing supporting method, it is characterized in that: after described cement-soil spray is stirred and finished, can insert the strength shaped materials such as shaped steel, to increase the intensity of pile body, the strength shaped material can recycle and reuse.
4. long spiral down-hole hammer vibration churning cement-soil Section-steel Piles foundation ditch sealing supporting method according to claim 1 is characterized in that: after piling wall forms, adopt anchor pole and/or inner support to form compound foundation pit supporting system.
5. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil Section-steel Piles foundation ditch sealing supporting method, and it is characterized in that: formed foundation pit supporting system has certain impermeability, can realize not dewatering construction, the protection groundwater resources.
6. long spiral down-hole hammer according to claim 1 vibrates churning cement-soil Section-steel Piles foundation ditch sealing supporting method, 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104532853A (en) * | 2014-12-30 | 2015-04-22 | 武汉中力岩土工程有限公司 | Deep foundation pit supporting method and system characterized by steel reinforced cement-soil piles, bolts easy to detach and automatic monitoring and early warning |
| CN104631480A (en) * | 2014-12-26 | 2015-05-20 | 中铁二局股份有限公司 | Method for performing deep foundation pit waterproof curtain construction by adopting high-pressure jet grouting pile machine |
| 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 |
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104631480A (en) * | 2014-12-26 | 2015-05-20 | 中铁二局股份有限公司 | Method for performing deep foundation pit waterproof curtain construction by adopting high-pressure jet grouting pile machine |
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| CN104532853B (en) * | 2014-12-30 | 2017-03-22 | 武汉中力岩土工程有限公司 | Deep foundation pit supporting method and system characterized by steel reinforced cement-soil piles, bolts easy to detach and automatic monitoring and early warning |
| 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 |
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
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Application publication date: 20130403 |