CN103741670B - A kind of method for processing foundation eliminating negative friction - Google Patents
A kind of method for processing foundation eliminating negative friction Download PDFInfo
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- CN103741670B CN103741670B CN201410011644.0A CN201410011644A CN103741670B CN 103741670 B CN103741670 B CN 103741670B CN 201410011644 A CN201410011644 A CN 201410011644A CN 103741670 B CN103741670 B CN 103741670B
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Abstract
The present invention discloses a kind of method for processing foundation eliminating negative friction, the method adopting granular pile and flexible pile to combine processes the negative friction that soil body deadweight consolidation produces, granular pile can be broken stone pile or sand-gravel pile, granular pile and flexible pile become to be arranged every row interval, and is equipped with Gravil-soil cushion at the foundation surface on top.The present invention is the compacted and consolidation settlement of close reduction foundation soil self of shaking by the construction of granular pile, load is made to be delivered in the bearing stratum of base by the construction of flexible pile again, to reduce stress and the compressive strain of stabilization zone, and due to the acting in conjunction of granular pile and flexible pile, inter-pile soil is produced to the effect of " extruding " and " seizing on both sides by the arms ", the consolidation settlement suppressing foundation soil and the negative friction caused thereof.Simultaneously by the metathesis of discharging consolidation and flexible pile, this treatment process of composite foundation also improves the bearing capacity of ground significantly.
Description
Technical field
The invention belongs to special foundation process field in geotechnical engineering, relate to a kind of method for processing foundation eliminating negative friction.
Background technology
Pile foundation, with its strong adaptability to foundation soil, the feature such as bearing capacity is high, sedimentation is little, is used widely in engineering practice.Ordinary circumstance, stake, under working property, bears the upper load of the overwhelming majority, and relative to the displacement that local products are raw downward, Pile side soil provides drag upwards to stake, is referred to as positive friction (Positiveskinfriction is called for short PSR); But in some cases, Pile side soil can produce downward displacement relative to stake, thus produces downward side friction to pile body, be referred to as negative friction (Negativeskinfriction is called for short NSF).Due to existence and the downdrag (summation of negative friction) that produces on pile body thus of negative friction, pile damage may be caused, the differential settlement on pile-end soil surrender or basis.How in the design the impact of reasonable contemplation negative friction on stake working property is the problem that engineering circles is paid close attention to always.Since Terzaghi and Peck proposes " negative friction " concept, Chinese scholars has carried out large quantifier elimination to pile foundation negative friction force, achieves certain achievement.
The essential reason that pile foundation negative friction force produces is that the consolidation settlement of Pile side soil is greater than pile body sedimentation.The risk factor of pile foundation negative friction force is roughly divided into following several situation:
(1) the deficient consolidation soft clay or the recent fill that are positioned at a side produce new consolidation under Gravitative Loads;
(2) large area ground piling makes Pile side soil layer compression consolidation;
(3) the saturated cohesive soil that sensitivity is higher, affects by construction disturbances such as piling, original ground is stopped up high, produces excess pore water pressure in inter-pile soil, and soft soil thixotropy strengthens, and produces again new consolidation settlement subsequently;
(4) liquescency soil layer issues raw liquefaction at exogenetic process and causes land subsidence and the negative friction that occurs;
(5) groundwater abstraction and engineering construction construction water drainage etc. without limit, makes soil body effective stress increase, causes the soil body to add depression, thus to the pile foundation generation negative friction in influence basin;
(6) surface settlement that the geotechnical engineering problems occurred in Process of Urban Development causes also may produce pile foundation negative friction force, as:
1) deep pit digging causes resistance to shear of soil to discharge generation release distortion, and the land subsidence in hole week acts in adjacent building pile foundation and may produce negative friction.In addition, ultra-deep foundation pit excavation causes the deep soil movement etc. of the soil body also may produce negative friction;
2) along with the exploitation of the underground space, in city, underground construction gets more and more, as subway, underground street, underground store and underground sewage interflow engineering etc.This kind of engineering is carried out at shallow underground often, and excavated surface instability causes ground loss, resistance to shear of soil to discharge and disturbed soil consolidation again, causes ground soil body large deformation, also may produce negative friction to top or adjacent building pile foundation.
The construction that the current whole nation is carried out in deficient consolidation soft soil layer is increasing year by year, and engineering geological problems caused by negative friction is of common occurrence, therefore the negative frictional resistance that caused by soil solidifying sedimentation how is solved also in more and more referred schedule, owing to lacking corresponding engineering experience and deep theoretical research, and be accordingly no matter country, industry or regional technology codes and standards, still lack " negative frictional resistance caused by soil solidifying sedimentation " prospecting, design, construction and detect and the relevant art regulation of monitoring.On the basis of the many factors such as comprehensive safety, economy, reliable and engine request, invent the method for processing foundation that granular pile and flexible pile combine and eliminate the negative friction produced by soil solidifying, reduce soil body sedimentation on this basis, and improve bearing capacity of foundation soil significantly.Namely first granular pile construction processing is carried out, with since displacement and compacted, shake close underconsolidated soil or recent fill, eliminate underconsolidated soil or recent fill deadweight consolidation and deficient consolidation, the negative friction effect reducing composite foundation reinforcement to a certain extent and the settlement after construction especially produced; Afterwards, carry out flexible pile construction, by the acting in conjunction of granular pile and flexible pile, carry out again compacted to inter-pile soil, and by the interaction between two kinds of pile foundations, inter-pile soil generation is seized on both sides by the arms and blocked effect, thus further reduce the negative friction effect of composite foundation reinforcement, compared with high-bearing capacity and metathesis, the modulus of compressibility of bearing capacity of foundation slab and soil is greatly improved in addition due to flexible pile, thus reach processing intent, to meet quality and safety that superstructure design requires and guarantees construction project.
Summary of the invention
technical problem:the present invention is directed to the harm that in the underconsolidated soil place of recent deposit, negative friction produces to increase gradually, but process and the single backwardness of method solved, be difficult to the problem ensureing foundation settlement deformation and bearing capacity Structural Design Requirement while effectively solving negative friction harm, provide one first to construct granular pile, to construct again flexible pile, two kinds of pile body conbined usage, can eliminate the method for processing foundation of the elimination negative friction of the negative friction caused due to soil solidifying well.
technical scheme:the method for processing foundation of elimination negative friction of the present invention, comprises the following steps:
First constructed by vibration compaction method, multiple granular piles that structure quadrate array is arranged, interval is after at least 7 days, more multiple flexible piles that constructing structure quadrate array is arranged, the quadrate array of flexible pile and the square array of granular pile are listed in that both sides length direction is all parallel to be staggered; Finally lay rubble drainage blanket at the foundation surface on granular pile and flexible pile top.
In a kind of preferred version of the inventive method, granular pile is broken stone pile or sand-gravel pile; By the idiographic flow of vibration compaction method structure granular pile be:
1) mobile installation and to saddle, Vibration on Start-up pile monkey after pile pipe and pile top perpendicular alignmnet stake position, in being buried by pile pipe vibration dip, until the stabilization zone degree of depth;
2) fill after the metaling configured from the funnel that feeds intake of upper end to pile pipe, pile pipe is extracted on vibration limit, limit, namely stops tube drawing after every tube drawing 50-80cm, continues tube drawing, until steel pipe rises to design of pile top absolute altitude after vibration 20-30s;
3) on former stake position, repeatedly repeat step 1) to step 2) operating process, in pile body, volumetric efficiency is greater than till 1.3.
The step 2 of the above-mentioned preferred version of the inventive method) in, metaling is crushed stone or the boulder and cobble block of particle diameter 20-50mm, and the fullness coefficient that pile pipe filled by metaling is not less than 1.3.
The step 2 of the above-mentioned preferred version of the inventive method) in, metaling recharges to pile pipe after adding water to saturation state.
In a kind of preferred version of the inventive method, flexible pile is high-pressure rotary jet grouting pile, cement mixing method or lime pile.
In a kind of preferred version of the inventive method, flexible pile is the high-pressure rotary jet grouting pile according to tri-tube method structure, and Specific construction flow process is:
First by drilling-machine shifter to referring to fixed pile, hole to the stabilization zone degree of depth, aperture is 15-20cm;
After playpipe is placed into foot of hole, opens sprinkling irrigation and start to spray: the ejecta of three playpipes is respectively cement paste, water and air; The three-phase mixture of sprinkling irrigation cuts soil body mixed pile-forming, and meanwhile, and with the speed rotary lifting playpipe of 0.1-0.2m/min, till rising to design of pile top absolute altitude, pile completes.
In the above-mentioned preferred version of the inventive method, in the construction process according to tri-tube method structure high-pressure rotary jet grouting pile, slurries expulsion pressure is not less than 30MPa, and gas jet pressure is not less than 0.7MPa, and cement paste injection rate is not less than 35%, and emitted dose is not less than 30L/min.
Method for processing foundation of the present invention is the composite foundation that granular pile and flexible pile combine, and comprises granular pile and flexible pile, and granular pile and flexible pile are put every arrangement, lays rubble drainage blanket at the foundation surface on granular pile and flexible pile top.
Every arranging, the arrangement mode put can be: granular pile and each row's cover off of flexible pile, overall in arranged in squares.Also can be: each flexible pile is arranged on the center line of the adjacent granular pile line of adjacent row two that each flexible pile and adjacent two granular piles form triangular form and arrange.
Method for processing foundation first carries out the construction of vibration compaction method granular pile, and granular pile carries out the construction of tri-tube method high-pressure rotary-spray flexible pile after having constructed, and two kinds of pile body constructions should not be less than 7 days interval time.
Granular pile of the present invention and flexible pile interact as shown in Figure 2.Construction technology, for first to carry out granular pile construction, reaches vibration by vibration sinking tube to the stake periphery soil body, compacted, the effect of shaking in advance.Make inter-pile soil particle rearrangement, and produce excess pore water pressure, then accelerate rate of consolidation by the soil body that self good level to drainability is, part reduces the consolidation settlement after work and its negative friction caused.But self bearing capacity due to granular pile is limited to the maximum side limiter of Pile side soil body, so the bearing capacity of composite foundation and sedimentation generally can not meet design requirement, turn round and look at and carry out flexible pile construction again, by flexible pile construction, inter-pile soil is extruded again, granular pile is produced to the effect of " fender pile " simultaneously in stabilization zone, improve the bearing capacity of granular pile; The effect of under granular pile and flexible pile acting in conjunction, extruding is produced to inter-pile soil, seizing and blocking on both sides by the arms, the consolidation settlement that can significantly suppress deficient consolidation to be banketed and its negative friction caused.Overlying burden can be delivered in the bearing stratum of base by the metathesis of flexible pile self, to reduce stress and the compressive strain of stabilization zone, increases substantially bearing capacity of foundation soil.The inventive method can effectively eliminate to cause negative friction because of the soil body self consolidation settlement, ensures pile body safety.
beneficial effect:the present invention compared with prior art, has the following advantages:
Method for processing foundation of the present invention effectively solves the negative friction harm that Recently deposited soil area causes due to the deficient consolidation of the soil body, and while process negative friction, ensure sedimentation and deformation and the bearing capacity Structural Design Requirement of ground.The reinforcement mechanism of the method mainly comprises:
(1) by the vibration compaction method construction of granular pile, compacted, effect that is close and pre-shock of shaking is produced to silt or sand foundation, and displacement, draining and certain crowd in-out effects are produced to cohesive soil ground.The vibration that foundation soil is constructed due to granular pile, produce excess pore water pressure and soil particle distribution again, along with the pore water pressure dissipation in foundation soil, the free drainage passage that water in soil is formed by granular pile is discharged, make foundation soil accelerate saturated consolidation, reduce consolidation settlement and its negative friction caused of foundation soil to a certain extent.
(2) by flexible pile construction, inter-pile soil body is strengthened again, simultaneously and granular pile acting in conjunction, to inter-pile soil body produce again compacted, seize on both sides by the arms and block effect.Between stake, foundation soil reaches consolidation equilibrium state substantially by the acting in conjunction of granular pile and flexible pile, essentially eliminates because the soil body sinks to the negative friction of composite foundation pile body generation.
Wherein granular pile have well compacted, shake close, to shake and the effect of draining can accelerate the consolidation of inter-pile soil body in advance, tentatively reduce the sedimentation caused by consolidation and negative friction.Rubble drainage blanket and the granular pile on the ground top of simultaneously laying combine the drainage system constituting and be connected in length and breadth, shorten the consolidation that drainage distance accelerates inter-pile soil body further.Again improve the performance of inter-pile soil again by the mutual squeezing action of flexible pile and granular pile, and flexible pile has the bearing capacity that higher Rigidity and strength and metathesis ensure that ground.Simultaneously because the present invention only adopts partially flexible cement earth pile to be used for replacing granular pile, make process negative friction and improve on the basis of Bearing Capacity of Composite Foundation, maintaining granular pile composite foundation with low cost, be beneficial to the advantage of popularization.
Accompanying drawing explanation
Fig. 1 is granular pile of the present invention construction and effect schematic diagram;
Fig. 2 is granular pile of the present invention and flexible pile acting in conjunction schematic diagram.
Fig. 3 is layout schematic diagram of the present invention.
Have in figure: 1-pile steel pipe, 2-feed intake funnel, the casting resin of 3-granular pile, 4-pile pipe places the stage, the stage is buried in the vibration of 5-pile pipe, 6-feeding stage, vibration limit, 7-limit tube drawing stage, 8-again vibrate and press down and feeding stage, 9-vibration sleeping bearing stratum under lifting pipe stage, 10-granular pile, 11-flexible pile, 12-Gravil-soil cushion, 13-stabilization zone, 14-.
Detailed description of the invention
Method for processing foundation of the present invention is the composite foundation that granular pile and flexible pile combine, and comprises granular pile and flexible pile, and granular pile and flexible pile are put every arrangement, lays granular pile drainage blanket at the foundation surface on granular pile and flexible pile top.
The arrangement mode put every arranging can be granular pile and each row's cover off of flexible pile, overall in arranged in squares; Or each flexible pile is arranged on the center line of the adjacent granular pile line of adjacent row two, each flexible pile and adjacent two granular piles form triangular form and arrange.By the crisscross combined water drain passage of granular pile and drainage blanket, make inter-pile soil discharging consolidation rapidly, reach the consolidation settlement and negative friction that reduce the soil body further.
The concrete steps of the method for processing foundation of elimination negative friction of the present invention are:
First constructed by vibration compaction method, form the granular pile of square arrangement, interval is after at least 7 days, constructed by tri-tube method again, form the flexible pile of square arrangement, flexible pile and granular pile each arrange cover off, overall in arranged in squares or flexible pile and adjacent two granular piles form triangular form and arrange.Finally lay granular pile drainage blanket at the foundation surface on granular pile and flexible pile top;
The idiographic flow of vibration compaction method structure granular pile is:
1) get out construction machinery, and target place is flattened.Move desired location by vibratory pile drive and extractor and to saddle, pile pipe and pile top perpendicular alignmnet stake position, closed flap valve shoe, goes up definitely, underground barrier-free hinders Vibration on Start-up pile monkey after thing, in being buried by pile monkey vibration dip by pile steel pipe, until the stabilization zone degree of depth;
2) flap valve shoe is opened, the metaling configured is added from the funnel that feeds intake of pile pipe upper end, pile steel pipe is extracted on vibration limit, limit, namely stop feeding intake and tube drawing after pile steel pipe pulls up 50-80cm, start to vibrate 20-30s downwards, then continue tube drawing to feed intake, repeat to pull up-vibrate this link until steel pipe rises to design of pile top absolute altitude;
3) extract pile steel pipe, continue Vibration on Start-up pile monkey in situ, during pile steel pipe is buried by pile monkey vibration dip, until the stabilization zone degree of depth.After again repeat to pull up-vibrate this link steel pipe risen to design of pile top absolute altitude, ensure pile body compactness.In pile body, volumetric efficiency is greater than till 1.3.
The idiographic flow of tri-tube method structure high-pressure rotary-spray flexible pile is:
1), after treating place granular pile construction, leave standstill more than 7 days, pore-forming drill is moved to finger fixed pile, hole to the stabilization zone degree of depth, aperture is about 15-20cm;
2) drop into until foot of hole in boring by playpipe, the cement paste hydrous water that injection has configured and gas spray simultaneously, and start rotary lifting slowly, and cut the common pile of pile peripheral earth mix cement slurry, hoisting velocity is 0.1-0.2m/min;
3) during jet grouting pile construction, gunite pressure is not less than 30MPa, and flow is greater than 30L/min, stream pressure 0.7Mpa.The distance of spray-hole and high-pressure injection pump is not more than 50m, and bore position and design attitude deviation are not more than 50mm, and the lap length that playpipe segmentation promotes is not less than 100mm; Whitewashing should be continuous, must not broken pile, and the whitewashing lap length after whitewashing pauses for some reason is not less than 100mm.Promote spray-hole till design of pile top absolute altitude, pile completes.
Claims (5)
1. eliminate a method for processing foundation for negative friction, it is characterized in that, the method comprises the following steps:
First constructed by vibration compaction method, multiple granular piles (10) that structure quadrate array is arranged, interval is after at least 7 days, multiple flexible piles (11) of arranging of constructing structure quadrate array again, quadrate array and the square array of granular pile (10) of described flexible pile (11) are listed in that both sides length direction is all parallel to be staggered; Finally lay rubble drainage blanket at the foundation surface on granular pile (10) and flexible pile (11) top; Described flexible pile (11) is high-pressure rotary jet grouting pile, cement mixing method or lime pile;
Described granular pile (10) is broken stone pile or sand-gravel pile; The idiographic flow being constructed granular pile (10) by vibration compaction method is:
1) mobile installation and to saddle, Vibration on Start-up pile monkey after pile pipe and pile top perpendicular alignmnet stake position, in being buried by pile pipe vibration dip, until the stabilization zone degree of depth;
2) fill after the metaling configured from the funnel that feeds intake of upper end to pile pipe, pile pipe is extracted on vibration limit, limit, namely stops tube drawing after every tube drawing 50-80cm, continues tube drawing, until steel pipe rises to design of pile top absolute altitude after vibration 20-30s;
3) on former stake position, repeatedly repeat step 1) to step 2) operating process, in pile body, volumetric efficiency is greater than till 1.3.
2. a kind of method for processing foundation eliminating negative friction according to claim 1, is characterized in that, described step 2) in, metaling is crushed stone or the boulder and cobble block of particle diameter 20-50mm, and the volumetric efficiency that pile pipe filled by metaling is not less than 1.3.
3. a kind of method for processing foundation eliminating negative friction according to claim 1 and 2, is characterized in that, described step 2) in, metaling recharges to pile pipe after adding water to saturation state.
4. a kind of method for processing foundation eliminating negative friction according to claim 1 and 2, is characterized in that, described flexible pile (11) is the high-pressure rotary jet grouting pile according to tri-tube method structure, and Specific construction flow process is:
First by drilling-machine shifter to referring to fixed pile, hole to the stabilization zone degree of depth, aperture is 15-20cm;
After playpipe is placed into foot of hole, opens sprinkling irrigation and start to spray: the ejecta of three playpipes is respectively cement paste, water and air; The three-phase mixture of sprinkling irrigation cuts soil body mixed pile-forming, and meanwhile, and with the speed rotary lifting playpipe of 0.1-0.2m/min, till rising to design of pile top absolute altitude, pile completes.
5. a kind of method for processing foundation eliminating negative friction according to claim 4, it is characterized in that, in the described construction process according to tri-tube method structure high-pressure rotary jet grouting pile, slurries expulsion pressure is not less than 30MPa, gas jet pressure is not less than 0.7MPa, cement paste injection rate is not less than 35%, and emitted dose is not less than 30L/min.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105155505B (en) * | 2015-08-21 | 2017-04-12 | 四川九鼎智远知识产权运营有限公司 | Construction method for rigid pile composite foundation |
| CN106759297A (en) * | 2016-11-22 | 2017-05-31 | 广州中煤江南基础工程公司 | A kind of construction method of support pile and three pipe high-pressure rotary jet grouting pile deep basal pits |
| CN106836221A (en) * | 2017-01-03 | 2017-06-13 | 江苏工程职业技术学院 | A kind of open caisson vibrosinking pile Composite foundation construction technique |
| CN110004907A (en) * | 2019-03-27 | 2019-07-12 | 河海大学 | Miniature steel pipe pile-immersed tube sand-gravel pile joint foundation stabilization construction method and its structure |
| CN110438973A (en) * | 2019-06-27 | 2019-11-12 | 福建鼎拓工程勘察设计有限公司 | A kind of reinforcement means of soft foundation |
| CN112211176A (en) * | 2019-07-10 | 2021-01-12 | 广东工业大学 | Microorganism grouting and drainage curing pile and construction method and application thereof |
| CN113073639A (en) * | 2021-04-13 | 2021-07-06 | 兰州大学 | Stepped loess foundation reinforcing method and built variable-rigidity combined pile composite foundation |
| CN113622405B (en) * | 2021-08-13 | 2023-05-02 | 广东景玮建筑工程有限公司 | Construction method of granular pile for building |
| CN114032879A (en) * | 2021-12-16 | 2022-02-11 | 中交烟台环保疏浚有限公司 | Soft foundation reinforcing equipment and reinforcing method for coastal hydraulic reclamation area |
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| JP5319266B2 (en) * | 2008-12-18 | 2013-10-16 | 三菱樹脂株式会社 | Ground reinforcement method and improved ground structure |
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| CN101250873A (en) * | 2008-04-10 | 2008-08-27 | 徐玉杰 | High-pressure injection slip-casting construction method for flabbiness foundation |
| JP5319266B2 (en) * | 2008-12-18 | 2013-10-16 | 三菱樹脂株式会社 | Ground reinforcement method and improved ground structure |
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