CN1027911C - Drilling pile method construction technology - Google Patents

Abstract

The present invention provides a new technology for sinking piles-a method for burying piles by drilling holes, which comprises the steps of arranging a sample pile to locate a pile position, locating a driller at a drill hole, measuring the hole depth, hole diameter, loose soil and deposit at hole bottom, protecting wall with cement mortar, burying a precast pile, burying the pile toe of the precast pile to a designed height, pulling out a pile conveying pipe, and filling loose soil back to a pile hole. The new technology improves squeezing soil piles into low squeezing soil piles, reduces the rise of water pressure at super gaps and the projection and displacement of soil mass, eliminates the adverse effects on adjacent buildings, streets, constructional works, etc. in sinking piles, and overcomes the construction difficulty when passing through hard soil clamping layers, etc. under specific conditions.

Description

Drilling pile method construction technology

The present invention relates to process for sinking.

Existing process for sinking is direct hammer piling by force on the stake position, this technology should not be used for downtown area intensive building, contiguous road and the various area of underground utilities intersection, big during because of piling to the amount of squeezing of the soil body, thereby produce earth horizontal displacement and vertical displacement (protuberance), when particularly driving piles as hard folder soil layer, the stake point is difficult to enter design elevation, cause the serious damage of stake, the delay engineering time is caused loss economically, and has a strong impact on the safety of surrounding buildings thing, road, structure.

Disclosed auger construction method of Japan Patent 56-81717 and spiral excavate bar, it establishes stake ground with the auger perforation, promotes auger then and stays stake, needn't use mortar, swell soil in a large number, but should construction bother, speed is slow, operation easier is big, difficult quality guarantee.

The technology characteristics of GB1382563 is:

1. drilling depth is isometric with stake, i.e. boring is deep to the sharp design elevation of stake.

2. bore diameter is greater than stake footpath, replants stake after pouring into the bearing stratum that flows.

3. after boring is finished, pour into concrete in the stake bore ends, and end certain-length scope enlarges.This construction technology operation road number is many and complicated, make troubles to construction, progress is unhappy, long in time limit, precast pile no certain hammering degree of depth on original soil lacks stake to the original soil anchorage effect simultaneously, is difficult to guarantee that pile is subjected to multiple load (as horizontal loading), and pile body does not have certain compacted effect to original soil, can influence the frictional resistance of single pile.

The process for sinking that the objective of the invention is to overcome the deficiencies in the prior art and a kind of novelty is provided, to solve downtown area intensive building and hard pile sinking difficulty of pressing from both sides the long stake of steel bar concrete of soil layer, be improved as the low soil stake of squeezing squeezing soil stake, guarantee adjacent structure, the safety of road, underground utilities along the street.

Main contents of the present invention comprise loosened soil sediment → mud off → implantation preformed pile at the bottom of setting-out fixed stake position → rig boring in place → measurement hole depth, aperture and the hole, make a point reach design elevation → pull out pile follower pipe, backfill pile follower endoporus loosened soil.

Characteristics by technology construction of the present invention are to be improved as the low soil stake of squeezing squeezing the soil stake, reduce super interstitial hydraulic pressure rising and soil body protuberance and land movement, thereby when having got rid of pile sinking to adjacent structure, the harmful effect of road, underground utilities along the street, solved the difficulty of construction under the specified conditions that pass through hard folder soil layer etc., and accelerate pile sinking speed, guarantee the pile sinking quality.

The job practices of stake will be described in further detail below.

At first, must carry out smooth densification to the job site, guarantee that road, water, electricity lead to, according to design idea, be equipped with personnel and various machinery, plant and instrument, operating personnel must be familiar with geological conditions, press the follow procedure construction then:

A. accurately reserve a site in the job site of smooth densification, carry out tangible sign, comprise the sign behind the pore-forming;

B. auger preparation in place boring, auger at first stablize drilling rod after vertical, steadily in place, use two transit bidirectional correctings again, begin the operation pore-forming then, run into obstacle as finding the rig drill bit, should stop to bore processing immediately; As find seriously to collapse the hole when holing, and should mention drill bit immediately, adopt an effective measure, finish to guarantee pore-forming, in work progress, to grasp the speed of creeping into flexibly.The piling verticality is controlled at 1-0.5% by standard, to guarantee to implant the verticality of preformed pile.Bore diameter is decided on preformed pile, and for 2/3rds of the bore diameter side of approximating of precast square pile stake inscribed circle diameter or stake section, the bore diameter of pre-rounding stake approximates 2/3rds of its diameter.Plant a hole depth and be controlled at the above appropriate location of the sharp elevation of stake or be not more than about 2/3rds of embedded pile long (length overall), to keep stake that certain anchorage length is arranged and to be driven into the degree of depth, to satisfy the allowable bearing capacity of single pile requirement.Simultaneously, attention boring pitch-row is to guarantee that the stake and the spacing of stake are 3-4 times the stake footpath or the length of side of stake.

C. according to above-mentioned boring requirement, pore-forming is measured loosened soil sediment at the bottom of hole depth, aperture and the hole, and carry out record.

D. for the hole of seriously collapsing, the hole that prevents to bore, must carry out mud off, promptly adopt the nature pulping to make flushing liquor, treat that the mud solid phase is increased to discharge underflow liquid in the time of to creep into, add clear water then.For the mud that in time transports boring with consider the mud that pumps in hole Cheng Dian as early as possible, reduce freight volume, around building, dig out one dark 1.5 meters, wide about 1 meter shockproof ditch, and the usefulness of double as collection mud sump.

E. plant and beat preformed pile, pile driver vertically, steadily in place, be implanted into the steel bar concrete preformed pile in the hole, continue bidirectional correcting, begin impact pile driving then with two transits, until the post point being squeezed into design elevation and carrying out various technical data records, during piling, one deck damping material, one section stake especially in the end must be heated in the stake top, hammer force maximum, its top add cushion material and must strictly pay attention to.Piling order generally should elder generation be played long stake, and stub is beaten in the back, beats earlier outer skirt piles, and central pile is beaten in the back, in case stop bit moves minimizing to the harmful effect of building, structure all around.The piling process in case of pile body disconnected attack, pile top break, pile sinking do not reach design elevation, pile body inclining, pile extension place get loose cracking, a stake top gasket material falls or the like, in case discovery should be taked corresponding measure immediately.There is sudden change to sink or abnormal conditions as pile sinking, should stops construction, in time get rid of., the pile sinking degree of depth should strict control pile body vertical, final set in the piling process, and perform the record of all technical data.

F. at the empty hole backfill loosened soil at pile follower position, prevent that human body from falling, and leads to a disaster.And timely site clearing mud, keep the job site civilized construction, avoid because of the fluent security incident that takes place.

Claims (3)

1, a kind of job practices, accurately reserve the stake position in the job site of smooth densification and put a site, carry out sign, performing boring prepares, the keyhole degree of depth is less than the design height of stake, wait to have bored and measure loosened soil sediment at the bottom of hole depth, aperture and the hole behind the hole, it is characterized in that before measuring the aperture in place by stake site sign auger, by designing requirement boring, 2/3rds of the cylinder bit bore dia side of approximating stake inscribed circle diameter or stake section, the bore diameter of cylinder approximates 2/3rds of its section; The loosened soil sediment is measured at the bottom of carrying out hole depth, aperture and hole after the boring, carry out mud off then, adopt the nature pulping to make flushing liquor, treat that the mud solid phase is increased to discharge underflow liquid in the time of can not creeping into, add clear water then, replant and beat preformed pile, promptly be implanted into steel bar concrete preformed pile to stake point and reach design elevation, last empty hole backfill loosened soil at the pile follower position in the hole.

2, the job practices of stake as claimed in claim 1 is characterized in that the stake and the spacing of stake are about 3-4 times the stake footpath or the length of side of stake.

3, the job practices of stake as claimed in claim 1 is characterized in that planting a drilling depth and is controlled at the above position of the sharp elevation of stake, or is not more than about 2/3rds of embedded pile length.