CN107100164A - A kind of long auger guncreting pile construction method - Google Patents

A kind of long auger guncreting pile construction method Download PDF

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Publication number
CN107100164A
CN107100164A CN201710253075.4A CN201710253075A CN107100164A CN 107100164 A CN107100164 A CN 107100164A CN 201710253075 A CN201710253075 A CN 201710253075A CN 107100164 A CN107100164 A CN 107100164A
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China
Prior art keywords
steel reinforcement
reinforcement cage
cage
stake
construction
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CN201710253075.4A
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Chinese (zh)
Inventor
张波
丁大海
赵旭
才永胜
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China Metallurgical Construction Engineering Group Co Ltd
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China Metallurgical Construction Engineering Group Co Ltd
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Priority to CN201710253075.4A priority Critical patent/CN107100164A/en
Publication of CN107100164A publication Critical patent/CN107100164A/en
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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
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0023Cast, i.e. in situ or in a mold or other formwork

Abstract

The invention discloses a kind of long auger guncreting pile construction method, comprise the following steps, S1, measurement and positioning determine the position of guncreting pile hole to be drilled;Steel reinforcement cage, is inserted perpendicularly into stake to designed elevation, above improves lever by S2, well cementing, S3, underthrust steel reinforcement cage using vibrating arm;S4, second pouring concrete and vibration compacting;In the step S3, steel reinforcement cage of the bottom in cone is first made, there is on the steel reinforcement cage extension set along the direction away from bottom at least one cage bar, when the steel reinforcement cage is inserted into designed elevation, the extension is higher by the top of stake holes;In steel reinforcement cage down process, survey is copied to the upper end progress absolute altitude of the extension of the steel reinforcement cage, according to the distance of the upper end of extension to cage top, the actual elevation of steel reinforcement cage is judged.The present invention has steel reinforcement cage underthrust easy construction, and efficiency of construction is higher, is easy to observe the position of steel reinforcement cage, makes steel reinforcement cage underthrust position precisely, the advantages of being conducive to improving construction quality.

Description

A kind of long auger guncreting pile construction method
Technical field
The present invention relates to technical field of building construction, in particular to a kind of long auger guncreting pile construction method.
Background technology
Long auger cast-with-pressure concrete pile is the cast-with-pressure concrete pile pile skill developed on the basis of long spire dry drill method Art, the technology is to be drilled using long-spiral drilling machine to projected depth, and drilling rod is passed through using concrete pump while brill is carried Concrete, is depressed into stake holes by central passage with certain pressure, after filling concrete to designed elevation, then is shaken by special Dynamic equipment inserts steel reinforcement cage the deposited reinforced concrete pile in concrete to designed elevation formation.
Long-spiral drilling machine pressure fills pile-formation process because construction noise is low, equipment walking is flexible, pile-forming speed is fast, suitable to stratum Ying Xingqiang and be widely used, be avoided that weak soil, sand soil area pile undergauge, the construction quality problem of broken pile, solve mud Pollution problem, reduces cost, and can be used successfully to the pile on stratum below level of ground water.
During practice of construction, due to being submerged completely in concrete after steel reinforcement cage underthrust, it is impossible to observe steel reinforcement cage Position, it is not in place to easily cause steel reinforcement cage underthrust, or underthrust is too deep, so that construction quality is influenceed, in addition, steel reinforcement cage is inserted through under Cheng Zhong, once there is deflection, it will cause follow-up cage body underthrust difficult, influence construction speed, serious is likely to occur cage body Occurs useless stake in the oblique insertion side wall soil layer of guiding of vibrating arm.
The content of the invention
For above-mentioned the deficiencies in the prior art, the technical problems to be solved by the invention are:How one kind is provided and is easy to sight The position of steel reinforcement cage is surveyed, makes steel reinforcement cage underthrust position precisely, is conducive to improving the long auger guncreting pile construction of construction quality Method.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme:
A kind of long auger guncreting pile construction method, comprises the following steps, S1, measurement and positioning are provided according to Mapping departments Control point carries out stake position and throws survey, determines the position of guncreting pile hole to be drilled;S2, well cementing, it is deep to predetermined stake holes using stake machine drill Guncreting after degree;Steel reinforcement cage, is inserted perpendicularly into stake to designed elevation, above improved by S3, underthrust steel reinforcement cage using vibrating arm Lever;S4, second pouring concrete and vibration compacting;Characterized in that, in the step S3, first making reinforcing bar of the bottom in cone There is the extension set along the direction away from bottom on cage, the steel reinforcement cage at least one cage bar, make the steel reinforcement cage When being inserted into designed elevation, the extension is higher by the top of stake holes;In steel reinforcement cage down process, to the extension of the steel reinforcement cage Upper end carry out absolute altitude copy survey, according to the distance of the upper end of extension to cage top, judge the actual elevation of steel reinforcement cage.
Using the above method, absolute altitude is carried out by the extension top to steel reinforcement cage in down process and copies survey, due to extension What the distance on the upper end in portion to cage top was to determine, it is possible to judge the actual elevation of steel reinforcement cage, once the actual mark of steel reinforcement cage When height meets the requirement of designed elevation, you can propose vibrating arm, the underthrust construction of steel reinforcement cage is completed.So so that steel reinforcement cage Whole down process and underthrust depth can be monitored, so as to ensure steel reinforcement cage being properly inserted in design mark Height, is conducive to improving the construction quality of engineering.
Further, steel reinforcement cage is in down process, once the actual elevation of steel reinforcement cage higher than designed elevation and with design When the difference of absolute altitude is less than 100mm, lever is above improved.
Because vibration intensity can cause the uncontrollable of underthrust depth, and on improve lever during, remain in that vibration shape State so that concrete continues to shake with vibrating arm, and steel reinforcement cage can be caused to continue the segment distance that sinks under gravity.Separately Outside, during practice of construction, to avoid steel reinforcement cage top anchor length from minus deviation occur, steel reinforcement cage underthrust depth is performed " peaceful high not low " Principle, the height control of cage top mark is within+100mm.Using the above method, it is higher than designed elevation in the actual elevation of steel reinforcement cage When, vibrating arm is taken out in advance so that steel reinforcement cage continues to sink under the shake of gravity and concrete, so that steel reinforcement cage energy Designed elevation is inserted under reaching accurately.
Further, steel reinforcement cage first penetrates vibrating arm in steel reinforcement cage when underthrust is operated, then using crane by reinforcing bar Cage is sling vertically, makes steel reinforcement cage keep vertical state, alignment aperture to be transferred after being corrected by vibrating arm deadweight, during decentralization, First realize by the deadweight of vibration hammer, vibrating arm and steel reinforcement cage, when the subsidence velocity of steel reinforcement cage is close to zero, startup is shaken Dynamic hammer drives steel reinforcement cage vibration to transfer by vibrating arm.
Concrete is than more loose after being filled due to pressure, if directly progress vibration decentralization, easily the concrete in stake is smash shake it is close Cause cage body underthrust difficult in fact, and stop completely when steel reinforcement cage is being conducted oneself with dignity and, it is possible that because of vibration hammer itself weight Amount causes vibrating arm inclination to cause follow-up cage body underthrust difficult, and influence construction speed and pile quality, serious is likely to occur cage There is useless stake in the oblique insertion side wall soil layer of guiding of vibrating arm in body.Therefore, generally connect in the subsidence velocity for treating steel reinforcement cage When nearly zero, generally when subsidence velocity is less than 150mm/min, Vibration on Start-up hammer drives steel reinforcement cage vibration to transfer by vibrating arm.
Using the above method, when steel reinforcement cage will be stopped using sinking of conducting oneself with dignity, Vibration on Start-up is hammered into shape, can more facilitate fast The underthrust of prompt completion steel reinforcement cage, is conducive to improving construction quality and efficiency.
Further, the steel reinforcement cage includes cage bar and tie hoop, and the tie hoop is weldingly fixed on main ribs Outside, the intersection of the tie hoop and main ribs is also banded with steel wire.
Its tie hoop is with cage bar mainly using being welded to connect in manufacturing process for traditional steel reinforcement cage, and vibrating arm is being penetrated The problems such as stirrup sealing-off being easily caused in steel reinforcement cage.Using said structure, in tie hoop and the intersection of main ribs Steel wire is also banded with, the cage bar off normal caused by stirrup sealing-off can be avoided, is conducive to improving the construction quality of engineering.
Further, before measurement and positioning, foundation trench excavation is first carried out, the foundation trench bottom land absolute altitude is the superfilled mark of guncreting pile Height, excavation planar dimension should ensure that is reserved with the wide working faces of 2~3m in foundation trench surrounding, while carrying out clear bottom during excavation, and Bottom land absolute altitude is carried out during clear bottom to copy survey, the control flume bottom discrepancy in elevation is in -50mm~50mm.
Using above-mentioned setting, because foundation trench bottom land absolute altitude is the superfilled absolute altitude of guncreting pile, by setting foundation trench, Neng Gouji Shi Faxian concrete it is superfilled, so as to avoid the waste of concrete, be conducive to save construction cost.Reserved around foundation trench Working face wide 2~3m, is conducive to the operation of a machine.The control flume bottom discrepancy in elevation can be avoided because bottom land is high in -50mm~50mm Problem that the excessive pile depth brought of difference is not enough.Be conducive to improving the quality of pile.
Further, in the step S2, when specifically drilling, overhead traveling crane center, gyrator center and Zhuan Wei centers be should ensure that Control is observed to the perpendicularity of drilling rod on same vertical line, and by the horizon rule on drilling rod shaft, meanwhile, also hanging down It is straight that control is observed to the perpendicularity of drilling rod in being provided with theodolite on the direction of visual lines of driver.
Using above-mentioned setting, control is observed by the perpendicularity in the two directions to drilling rod, it is possible to achieve " double Control ", can be prevented effectively from drilling rod and be tilted in drilling process, so as to improve the forming quality of stake holes.
Further, in the step S2, after the completion of drilling reaches projected depth and sweeps bottom, concrete pump is started Concrete is conveyed into drilling tool, drilling tool is allotted in pumping, while making the pressure held stationary of concrete pump.
During construction, pressure fill carried in formation of pile brill and pumping concrete should close fit from beginning to end, drilling tool bottom discharging opening is not The liquid level of stake material in hole must be higher than, broken pile situation otherwise occurs, the quality of pile is influenceed.Using the above method, by ensureing Concrete conveyance pump pressure it is steady, it is ensured that carry brill with pumping be adapted, it is to avoid there is the situation of broken pile, be conducive to improve Pile quality.
In summary, the present invention has steel reinforcement cage underthrust easy construction, and efficiency of construction is higher, is easy to observe the position of steel reinforcement cage Put, make steel reinforcement cage underthrust position precisely, the advantages of being conducive to improving construction quality.
Brief description of the drawings
Fig. 1 is the schematic diagram of foundation trench in the inventive method.
Fig. 2 is the structural representation of steel reinforcement cage used in the inventive method.
Embodiment
With reference to embodiment, the present invention is described in further detail.
During specific implementation:A kind of long auger guncreting pile construction method, first carries out foundation trench excavation, as shown in figure 1, foundation trench Excavation answers priority control to excavate planar dimension and cutting depth well, should consider 2-3m work when planar dimension is positioned in foundation trench surrounding Face width, specifically reserved width should be before fluting with reference to installation model determination, it is to avoid backbreak or working face deficiency causes secondary open The generation of groove phenomenon;Meanwhile, mechanical equivalent of light excavation should have survey crew to copy survey bottom land mark during should having the clear bottom of hand fit, clear bottom Height, the bottom land discrepancy in elevation is not more than ± 50mm, it is to avoid the not enough problem of pile depth brought because the bottom land discrepancy in elevation is excessive.Excavation slope should be tied Run groove soil matter jointly and cutting depth determines slope ratio.When rainy season carries out piling work, drainage works, groove should have been disposed in advance Interior setting gutter, sump are simultaneously equipped with sufficient amount Yield rainfall relation equipment, it is to avoid because of rainwater bubble groove influence pile quality, stake machine peace Complete and construction delay phenomenon caused by bubble groove for a long time generation.
Then positioning is measured:The control point that should be provided after the completion of fluting by survey crew according to Mapping departments carries out stake Position, which is thrown, to be surveyed, and every pile point application steel bar end or welding rod are positioned and be flag of being wounded in action on steel bar end or welding rod, are noted on coloured flag Bright pile No. carries out mark, in order to be checked in piling.It is more in view of each building stake position, to ensure a level really, A reference stake position should be discharged during positioning every ten stake positions, this reference stake position should be discharged using timber and steel nail, and in benchmark A bit number is indicated in stake, adjacent studs position can be checked with this reference stake during construction.
Rig is in place, pore-forming:Before stake machine enters after groove, spudded in, should combine layout design effective length, survey report and scene The lower drilling depth of the data such as bottom land absolute altitude conversion is surveyed, and mark is carried out on drilling rod, with drilling depth under accurate control, it is to avoid few Brill, the generation of outdrill phenomenon.Before rig spuds in place, base and top should be steady, in overhead traveling crane center, gyrator center, stake position The heart should be located on same vertical line, i.e., " sight alignment ", drilling rod perpendicularity can realize single control by shaft horizon rule, be true before spudding in Drilling rod perpendicularity is protected, vertical observation should be carried out on other direction using theodolite, that is, realizes " dual control " purpose, meanwhile, it is Avoid drilling rod from being tilted in drilling process, no less than 2 times observation corrections should be carried out in drilling process.Normal rate of penetration 1~1.50m/min is can be controlled in, rate of penetration should at the uniform velocity be carried out neglecting and neglected soon slowly;In drilling process, such as find that drilling rod shakes When rolling or difficult brill, drilling depth should be slowed down, stake holes deflection, displacement and drilling tool damage is prevented, deflection should be adjusted in time if finding, be adjusted Drilling depth should be slowed down when whole, to ensure the perpendicularity of drilling.With the hole depth mark keyhole depth on drilling rod, drilling to design will After the depth and soil layer asked, it is necessary to carry out the clear soil that dallies in former depths, then stop operating, carry brill.In view of the technique pile belongs to In end-bearing friction pile stake, it should be carried out in construction after " dual control " i.e. drilling to designed elevation while to be unearthed to judge with reference to drilling Whether enter design soil layer, if soil property is not inconsistent, should can be resolved through consultation with prospecting, design, be sure not blindly to construct.
It is pumped concrete pile:Before spudding in it is ensured that enough single pile consumption concrete marched into the arena and finish slump detection, concrete slump It is required that 200 ± 20, it must be surveyed before concrete use of marching into the arena by car test, it is to avoid because the concrete stand-by period is long or because concrete itself workability is bad Cause steel reinforcement cage underthrust difficult, not in place and useless stake phenomenon occur;Meanwhile, the sampling of 50m3 concretes is often poured into a mould in formation of pile and does 1 Group(3 pieces)Test block, test block size is that correspondence pile No. and pile date are indicated in 100mm × 100mm × 100mm, test block, in regulation Send laboratory to carry out standard curing in time and determine its 28d compression strength.When drill hole of drilling machine reaches projected depth and to sweep bottom complete Cheng Hou, starts concrete pump and concrete is conveyed into drilling tool, treat concrete be transported to drilling tool bottom drilling tool slowly above carries to 100- 300mm, by observing concrete conveyance pump pressure whether there is change, to judge whether drill bit both sides valve has already turned on, conveys concrete After smooth, filling pile work can be pressed in Ti Zuan, forbids first to carry pumping concrete after pipe.
When pressure fills pile, drilling tool is allotted in pumping concrete;Carrying drilling speed degree will be adapted with rate of pumping, it is ensured that in central tube All the time concrete is full of, drilling speed degree general control is carried in 1.5~2m/min during pile;Pressure is filled to carry boring in formation of pile and answered with pumping concrete Close fit from beginning to end, drilling tool bottom discharging opening must not higher than stake material in hole liquid level, it is to avoid there is broken pile;In formation of pile It should be carried out continuously, pressure fills pile must one-time continuous perfusion completion.Pressure fills pile stake top absolute altitude and should be higher than that design stake top absolute altitude(≥ 500mm)And pour to flat with earth's surface one.
Cleaning product soil, fixed pile:Drilling, which is unearthed, to be concentrated mainly on around stake holes earth's surface, to ensure a level really and under reduction Depth is inserted, spoir around stake holes should be gone to pile side with excavator week and artificial before steel reinforcement cage contraposition, decentralization is carried out Coordinate and carry out aperture cleaning.
Underthrust steel reinforcement cage is to designed elevation:Bottom should be done with reference to the process characteristic, during fabrication of reinforcing cage coning, with Facilitate cage body underthrust, should to be included in stake long for the conical section in construction.
Its tie hoop is with cage bar mainly using being welded to connect in manufacturing process for steel reinforcement cage, and vibrating arm is penetrating into reinforcing bar Stirrup sealing-off problem is the common fault of the technique caused by cage, to avoid the occurrence of the cage bar off normal caused by stirrup sealing-off, reply The steel reinforcement cage for having worn vibrating arm is carried out " secondary to check and accept ", and firm using iron wire colligation to sealing-off stirrup.
Vibrating arm is penetrated in steel reinforcement cage in ground level, sling steel reinforcement cage vertically using crane, by vibrating arm certainly Steel reinforcement cage is kept vertical, placed in the middle again, transferred after should being corrected during decentralization by manual-alignment aperture, forbid cage body not just by force Decentralization.
During underthrust steel reinforcement cage, decentralization first is realized by the deadweight of vibration hammer+vibrating arm+steel reinforcement cage, when can not be after by deadweight During continuous insertion, open vibration hammering and realize that steel reinforcement cage is transferred by vibrating arm, the time for opening vibration hammer should be free in steel reinforcement cage Decentralization will terminate preceding startup, it is unsuitable too early, be easily caused that a bottom concrete is closely knit to cause cage body underthrust difficult too early;Meanwhile, open The time of vibration hammer also should not too late, if starting after the termination of steel reinforcement cage free releasing, in fact it could happen that because of vibration hammer own wt Causing vibrating arm to tilt causes follow-up cage body underthrust difficult, influences construction speed, and serious is likely to occur cage body in vibrating arm Guide in oblique insertion side wall soil layer and useless stake occur.
When steel reinforcement cage decentralization is close to projected depth, cage top mark height should be carried out copying survey by survey crew, it is contemplated that vibration force Degree causes the uncontrollable of underthrust depth, therefore, should in advance on improve lever, underthrust depth performs " peaceful high not low " principle, cage top Absolute altitude is controlled within+100mm.
Failure of oscillation and slowly continuously should not above it be carried during being carried on vibrating arm, meanwhile, vibrating arm bottom should be accomplished away from earth's surface 2m Within when failure of oscillation, to realize the vibration compacting to concrete piles.
Survey is copied for ease of cage top mark height, there should be 1 cage bar to extend to ground off-balancesheet during fabrication of reinforcing cage and be not less than 100mm, should Absolute altitude control muscle can also take later stage colligation or welding spreading.When it is implemented, the steel reinforcement cage uses following structures, such as Fig. 2 institutes Show, including many cage bars 1 being uniformly arranged along the circumference of steel reinforcement cage and be spirally wound on along the circumference of steel reinforcement cage in main ribs 1 Tie hoop 2, the tie hoop 2 is weldingly fixed on the outside of main ribs 1, and one end of main ribs 1 is towards steel reinforcement cage Axis direction bending, make the end steel reinforcement cage formation conical lower section;Have at least one main ribs 1 along the bottom of away from The extension 3 that the direction in portion is set, when the steel reinforcement cage is inserted into designed elevation, the extension is higher by the top of stake holes.
Using said structure, when being inserted into designed elevation due to steel reinforcement cage, the extension is higher by the top of stake holes so that steel Muscle cage in down process, all the time can to extension top carry out absolute altitude copy survey, due to extension upper end to cage top away from From what is be to determine, it is possible to judge the actual elevation of steel reinforcement cage.So so that the whole down process and underthrust of steel reinforcement cage Depth can be monitored, so as to ensure steel reinforcement cage being properly inserted in designed elevation, it is to avoid steel reinforcement cage was inserted It is deep or excessively shallow, be conducive to improving the construction quality of engineering.
During implementation, the intersection of the tie hoop 2 and main ribs 1 is also banded with steel wire.
Its tie hoop is with cage bar mainly using being welded to connect in manufacturing process for traditional steel reinforcement cage, and vibrating arm is being penetrated The problems such as stirrup sealing-off being easily caused in steel reinforcement cage.Using said structure, in tie hoop and the intersection of main ribs Steel wire is also banded with, the cage bar off normal caused by stirrup sealing-off can be avoided, is conducive to improving the construction quality of engineering.
During implementation, the extension 3 is the reinforcing bar being welded in main ribs.
Because cage bar is generally using batch production, length is than more consistent, by the way of the independent welded reinforcement in cage bar, It can improve the design of steel reinforcement cage again in the case where not influenceing the manufacture craft of original steel reinforcement cage, make it easy to absolute altitude Copy survey.Meanwhile, the discarded reinforcement ratio of job site is more, can be made full use of, and can improve the utilization rate of material, saves Cost.
During implementation, the pitch of the tie hoop 2 and the diameter ratio generally 1 of steel reinforcement cage:3.
Using above-mentioned setting, the intensity of steel reinforcement cage can either be ensured, the length of tie hoop can be shortened again, be conducive to section Material saving and cost.
Second pouring concrete, vibration compacting:As vibrating arm proposes outside hole that 1m or so drops occur in concrete in hole, on the one hand Be concrete itself it is closely knit caused by, be on the other hand caused by concrete is excessive caused by the vibrating arm underthrust;The drop part should treat that vibrating arm is carried Pour concrete is supplemented after going out in time and vibrating head is used(Φ50)Vibration compacting.
Pile quality is detected:After pile 28d, engineering pile is carried out in proportion by drawing and Test Technology of Pile Foundation code requirement Pile quality(Integrality)And vertical bearing capacity is examined, next step construction can be carried out after detection is qualified.
Above-mentioned construction method, by taking fluting piling method, saves the material usages such as concrete, reinforcing bar, meanwhile, because the duration carries Before, reduce the input of administration fee, labour cost, machine and equipment leasing expense etc.;Compared with other pile-type, the construction period significantly subtracts It is few, save labour cost, fee of material(Reinforcing bar, the saving of concrete materials are produced), machine and equipment leasing take and administration fee etc., with good Good economic benefit.
My company undertakes the construction of Hebei province's residential area project, the Wan ㎡ of overall floorage 19.34, by ground, underground two parts Composition, altogether including 33 monomers of size, wherein there is 11 17F small high-rises pile foundations to use long auger guncreting pile, stake footpath 600mm, the long 21.7m of stake, pile body concrete strength C30, concrete piles protective layer thickness 50mm, vertical ultimate bearing capacity of single pile standard value will Ask and reach 2800KN, vertical bearing capacity of single pile characteristic value 1400KN.
This engineering is by effectively controlling rational technology utilization and emphasis link, and construction quality produces a desired effect, together When, the construction period is saved, materials'use is reduced, reduces machinery cost, labour cost, administration fee input, achieve preferably Economic benefit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limitation, all essences in the present invention with the present invention Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.

Claims (7)

1. a kind of long auger guncreting pile construction method, comprises the following steps, S1, measurement and positioning are provided according to Mapping departments Control point carry out stake position throw survey, determine the position of guncreting pile hole to be drilled;S2, well cementing, utilize stake machine drill to predetermined stake holes Guncreting after depth;Steel reinforcement cage, is inserted perpendicularly into stake to designed elevation, above carried by S3, underthrust steel reinforcement cage using vibrating arm Vibrating arm;S4, second pouring concrete and vibration compacting;Characterized in that, in the step S3, first making steel of the bottom in cone There is the extension set along the direction away from bottom on muscle cage, the steel reinforcement cage at least one cage bar, make the reinforcing bar When cage is inserted into designed elevation, the extension is higher by the top of stake holes;In steel reinforcement cage down process, the extension to the steel reinforcement cage The upper end in portion carries out absolute altitude and copies survey, according to the distance of the upper end of extension to cage top, judges the actual elevation of steel reinforcement cage.
2. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that steel reinforcement cage is in down process In, once steel reinforcement cage actual elevation higher than designed elevation and when being less than 100mm with the difference of designed elevation, above improve lever.
3. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that steel reinforcement cage is operated in underthrust When, first vibrating arm is penetrated in steel reinforcement cage, then sling steel reinforcement cage vertically using crane, steel reinforcement cage is made by vibrating arm deadweight Keep vertical state, alignment aperture to be transferred after being corrected, during decentralization, first by vibration hammer, vibrating arm and steel reinforcement cage from Realize again, when the subsidence velocity of steel reinforcement cage is close to zero, Vibration on Start-up hammer drives steel reinforcement cage vibration to transfer by vibrating arm, It must not be hammered into shape in construction after steel reinforcement cage free-falling termination in Vibration on Start-up, so only can increase friction in down stroke.
4. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that the steel reinforcement cage includes cage bar (1)And tie hoop(2), the tie hoop(2)It is weldingly fixed on main ribs(1)Outside, the tie hoop(2)With Main ribs(1)Intersection be also banded with steel wire.
5. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that before measurement and positioning, is first carried out Foundation trench is excavated, and the foundation trench bottom land absolute altitude is the superfilled absolute altitude of guncreting pile, and excavation planar dimension should ensure that reserved in foundation trench surrounding There is the working face that 2~3m is wide, carry out clear bottom during excavation simultaneously, and survey, control flume are copied to the progress of bottom land absolute altitude during clear bottom The bottom discrepancy in elevation is in -50mm~50mm.
6. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that in the step S2, specifically During drilling, it should ensure that overhead traveling crane center, gyrator center and stake position are centrally located on same vertical line, and pass through the water on drilling rod shaft Leveling ruler is observed control to the perpendicularity of drilling rod, meanwhile, theodolite is also provided with the direction of visual lines perpendicular to driver Perpendicularity to drilling rod is observed control.
7. long auger guncreting pile construction method as claimed in claim 1, it is characterised in that in the step S2, work as brill After the completion of hole reaches projected depth and sweeps bottom, start concrete pump and concrete is conveyed into drilling tool, allot drilling tool in pumping, together When make the pressure held stationary of concrete pump.
CN201710253075.4A 2017-04-18 2017-04-18 A kind of long auger guncreting pile construction method Pending CN107100164A (en)

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