CN100424272C - Composite foundation prestress construction method for granular material static pressure pile - Google Patents
Composite foundation prestress construction method for granular material static pressure pile Download PDFInfo
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Abstract
A method for applying force to a composite foundation of a static pressure pile made of granular materials is suitable for foundation reinforcement treatment of weak or bad foundations such as saturated soft clay, loose fine sand soil, plain filling soil, miscellaneous filling soil, collapsible loess and the like, and forms a flexible pile composite foundation with an applied force by static pressure; adopting a pile pressing pipe of the static pressure pile machine, punching and extruding soil body by the pile pressing pipe through a hydraulic device, sending the pile pressing pipe into the soil layer by using static pressure to form a pile hole, then performing sectional feeding in the formed pile hole after pipe drawing, applying the static pressure once after feeding a section of material, and controlling to form a section of pile body according to the pre-designed given force; after the material is fed into the pile hole in an external feeding mode, the reinforced soil body around the hole wall is continuously exerted with a given force action, and then the pre-pressing is carried out in sections to form a pile in sections; the pile forming process is to apply a given force to the reinforced soil for many times; and the moving machine repeats the pile pressing process, and finally the flexible pile composite foundation with the acting force is formed.
Description
Technical field
The invention belongs to flabbiness ground strengthened processing method category.Particularly be fit to handle weak unfavorable foundations such as saturated soft clay, loose powder fine sand soil, plain fill, miscellaneous fill, collapsible loess.This static pressure flexible pile given-force construction method also can be used for correction and sets upright the house and save foundation pathology accident engineering except that being used for new construction.
Background technology
Ground both domestic and external is handled reinforcement means hundreds of kind even thousands of kinds.For reinforcing above-mentioned soft layer or loose unfavorable foundation, traditional processing method all is single processing method.According to its consolidation process mechanism, generally comprise cushion (claiming displacement method again), density method, drainage, glued method, reinforcement method and underpin method (only the ground base enforcement of old building being transformed employed method).Though concrete worker's method of each class methods can be selected for use at different soil conditions, treatment effeciency is often on the low side, thereby the technical economic benefit that seems is not high; Importantly: these single worker's methods be difficult to satisfy consolidation process requirement rapidly and efficiently, perhaps because the vibration or the noise of construction machinery, cause to building on the ground, underground contiguous facility influence is too big and be subjected to more restriction.
In addition, the constant appearance of foundation pathology accident also needs the punishment method that quick reinforcing is remedied.This worker method also can satisfy the technical requirements of this respect, becomes a kind of a kind of method rapidly and efficiently of curing foundation pathology accident.
The method of giving the processing of power effect composite foundation is the method that the present inventor proposes at first, the CN200510094735 multi-point stress vibrating-punching combined compacting method, be used for consolidation process hydraulic reclamation loosening sand ground, adopt associating vibroflotation method and two kinds of reinforcement means of vibroroller cmpacting compacting method of multi-point stress vibration to organically combine, promptly mate and integrate; The combined compacting method of multi-point stress vibration applies the power effect of giving for its loose sand skeleton, promptly applies the impulse force that shakes, exciting force, resonance power, extruding force and grinding pressure; Facilitate saturated loosening sand body to produce predeformation and pre-sedimentation, service load is added that the issuable most of total settlement elimination in back in the consolidation process process, makes it the load metamorphism requirement that foundation soil can satisfy the engineering operational phase after treatment better; Dash back-up sand soil base for what reinforce port works, it gives the dynamics standard and can be controlled in 0.85～0.65 scope, and dashes that to finish vibroroller cmpacting in 1～7 day time of back compacted shaking.
This worker method can be fundamentally used foundation soil and is given the power notion, gives the power technology and give power effect principle and go to deal with problems, Treatment Design and construction problem have a complete theoretical system to support, and this is only the key point that solves punishment weakness or unfavorable foundation soil condition and foundation pathology accident problem.Be controlled to quality of pile by the dynamics of giving, repeatedly to apply predeformation and the pre-sedimentation requirement that the power of giving realizes quickening to produce this composite foundation, residue absolute settlement and relative settlement that then follow-up service load produces just can reduce greatly, even might eliminate fully.
Summary of the invention
The present invention overcomes some shortcoming and defect parts of existing processing method, utilizes and gives the power notion, gives the power technology and give power effect principle, and worker's method is promptly constructed from notion, theory, technology, and to implement all be a kind of renewal of ideas and technological break-through.
The present invention is a kind of wound novel construction method.It will be transformed into the processing procedure of above-mentioned soft foundation or unfavorable foundation constantly and apply the process of giving the power effect to the foundation soil body continuous several times, make it the variation of weak soil property or bad soil body generation proterties and produce the pre-sedimentation of predeformation rapidly, reach elimination or reduce service load the later stage absolute settlement or the relative settlement that will produce after adding up.
Ground is applied the power of giving be not only the influence power that can improve ground soil nature that applies prestressing force but apply a kind of broad sense.This influence power, no matter from the time go up, on the space, quantitatively with controllability or adjustability aspect, can take all factors into consideration when the design by people and be optimized design, and can optimize and arrange construction technology and well construction.Engineers and technicians initiatively give the influence power of this broad sense of foundation soil, and the proterties that makes foundation soil is reached best improvement state.
Adapt to consolidation process and improve ground soil nature degree needs, introduced the notion of the dynamics of giving of giving the power technology.Give the dynamics of the giving λ of power composite foundation
sBe that expression is applied in the foundation soil body to improve the degree of foundation soil affect trait power.This dynamics of giving can be shown with following formula table:
In the formula, No and So be respectively improvement soil nature given give power and improvement soil nature in advance given displacement; N and S are respectively the stable displacement that the stress that acts under the service load on the foundation soil and foundation soil body should produce.
In fact, the improvement of ground soil nature, its main purpose is to make things convenient for it to bear the top imposed load for the compressibilty that reduces foundation soil and permeability to improve bearing capacity of foundation soil.Thereby the dynamics of giving of representing to give the power composite foundation with the void ratio formula of soil body volumetric change is more directly perceived.Promptly
In the formula, e
fRepresent to adopt the static pressure compaction filling void ratio of giving behind the power composite foundation stabilization respectively with e and reinforce before the stable void ratio of foundation soil under service load.
And the relational expression of void ratio: e
f=V
f/ V
s, e=V
v/ V
s, then the dynamics of the giving formula by the displacement concept definition can become:
In the formula, V
fThe compacted filling voids volume that reinforcement means will reach is used in the dynamics of the giving effect that is design down;
V
vBe that foundation soil body is reinforced preceding voids volume corresponding under service load;
V
sIt is the grogs volume under service load before foundation soil body is reinforced.This volume is indeclinable before and after ground stabilization.
Can choose according to two aspects of ratio that ground is handled the degree of depth and suffered dead load of foundation soil and mobile load for applying of the dynamics of giving, but reference table 1 when specifically selecting for use.
Table 1 is for the dynamics of the giving scope reference value of giving the power composite foundation
Annotate: 1. when vibrating load was arranged, the dynamics of giving should be got big value.When 2. hole, hole, the zone, cave of locality occurring for ground, adopt corresponding filling technique measure after, control its dynamics of giving again and handle.3. when superstructure had specific (special) requirements to uneven settlement of foundation, it gave dynamics control and makes special disposal in addition.4. add the * item in the table and note the specific (special) requirements of structure ground.
The present invention is based on above technical background; The basic theory system that runs through whole worker's method based on the inventor; The present invention is the center at the loose material hydrostatic pressure stake given-force construction method that gives on the power effect principle basis to improve soft unfavorable foundations such as consolidation process saturated soft clay, loose powder fine sand soil, plain fill, miscellaneous fill, collapsible loess, to improve its implementer's case is content, specifically comprises:
A) construction technology process of whole invention; B) the construction machinery type selecting of this worker method; C) power of the giving static pressure technology and the construction parameter control criterion of this worker method.The present invention is based on that said method is supporting has finished the constructure scheme design, and the technical quality safeguard measure that matches with the inventive method is arranged.
The object of the present invention is achieved like this:
Loose material hydrostatic pressure stake given-force construction method, the consolidation process that is used for weaknesses such as saturated soft clay, loose powder fine sand soil, plain fill, miscellaneous fill, collapsible loess or unfavorable foundation is characterized in that giving with formation the flexible pile composite foundation bearing mode of power effect; Adopt the piling pipe of this Static pressure pile driver, make the piling pipe cut extruding during the soil body is carried out by hydraulic means, utilize static pressure that the piling pipe is sent into and form the stake hole in the soil layer, then behind the tube drawing in established stake hole segmentation feed intake, throw one section after-applied static pressure of material, by one section pile body of the dynamics of giving control formation of design in advance; Promptly keep and apply the power effect of giving, segmentation precompressed again, one section one section ground pile after in the stake hole, feeding intake to manage outer feeding intake being reinforced the soil body around the hole wall; According to said method, tube drawing → feed intake again → static pressure → static pressure is to face of land pile then more again, and the bamboo joint type that forms a many places hole enlargement successively gives power effect flexible pile; Subsequently, telephone-moving repeats above piling process, has just formed the flexible pile composite foundation that gives the power effect at last.
Two kinds of pile pressing technology flow processs of the described power of giving effect flexible pile or rigid pile composite foundation are:
Pile press is assembled start in place---the die-cut soil body formation of piling pipe stake hole---, and tube drawing, input loose material, one section one section static pressure pile---repeats each root piling process---, and piling is finished the machine of tearing open and is removed
The piling pitch of holes can be calculated as follows and arrange:
Equilateral triangle is arranged
Arranged in squares
In the formula, S-gives power flexible pile or rigid pile composite foundation static pressure or rigid pile stake pitch of holes (m)
D-gives the stake footpath (m) of power flexible pile or rigid pile composite foundation static pressure or rigid pile
η
0-experience correction factor is selected for use according to the index request of the soil condition that is reinforced the soil body, static pressure size and consolidation process.When reinforcing weak and unfavorable foundation, η
0Get 1.10～1.22;
When Ground Treatment basic pathology accident, η
0Get 1.12～1.30.
γ
0And γ
1-be respectively to be reinforced and handle the soil body severe (kN/m of the soil body before and after reinforcing
3), fetching earth and testing near limit, piling stake hole.
Utilize hydraulic means to apply the dynamics of the giving control criterion of static pressure in 0.92～0.70 scope; Wherein, the dynamics of the giving standard of newly constructed house ground is controlled at 0.88～0.70 scope more; The dynamics of the giving control criterion of Ground Treatment basic pathology accident often is controlled at 0.92～0.75 scope.
Static pressed pile loose material flexible pile can be made into straight stake and taper pile, and the angle of depression of taper pile is controlled between 10 °～40 °.The loose material of static pressure comprises mulling, gravelly sand, slag, 3: 7 dirt, 2: 8 dirt, quicklime (piece ash), slags and mixes the dirt of 10～15% flyash.Particle diameter≤60mm, its compactness standard will be determined at the indoor compaction test of doing earlier.
Straight hole is that the 0.6m～1.2m that whenever feeds intake applies static pressure one time; Inclined hole is that the 0.4m～0.8m that whenever feeds intake applies static pressure one time.According to soil condition with drop into the loose material kind and apply the length that feeds intake that the static pressure size unifies to consider specifically to determine every section piling.
Equilateral triangle or two kinds of forms of square arrange to be adopted in position, piling hole, then utilize a pile press single-set operation, or two pile presss carry out branch's continuous productive process and finish.By the construction technology arrangement of above stake hole arrangement form, but the hole construction is jumped in the unit operation; But also two-shipper operation, the construction of staggering realizes the predetermined form that lays out pile at last.Static pressure loose material flexible pile, directly stake, taper pile and usefulness are particularly conducive to correction and set upright building and repair the application of foundation pathology engineering.
It is repeatedly to be used as the power of giving by static pressure to apply means that loose material hydrostatic pressure stake given-force construction method is handled above-mentioned ground soil property.Its static pressure that applies has following several effect:
A) guarantee the long inventory of every meter stake of Treatment Design, realize the volume pre-control of the compacted soil body;
B) guarantee the pile body compactness of Treatment Design, satisfy with the dry unit weight index of controlling pile body and give the dynamics control criterion;
C) power of the giving effect with static pressure forms pile body with the granular material extruding, has also formed drainage channel (contrast aquitard), can quicken the discharging consolidation of the soil body.
D) power of the giving mode with static pressure forms the lateral confinement condition of the soil body to pile body, gives the carrying effect of power flexible pile composite foundation with raising.
When being quicklime for loose material, this also can control the swell increment of quicklime pile body, can satisfy the required expansion force of engineering (as house deviation rectifying time) again; Simultaneously, can guarantee that also the imbibition rather than freely expand under the certain pressure condition of quicklime pile body sends out, then can satisfy the quicklime pile body tie under water hard after or else softening pressure condition.
Apply the power effect of giving by above static pressure to being reinforced soil body skeleton, promptly apply flush shear force, extruding force and frictional force, facilitate this weakness loose earth to produce predeformation and pre-sedimentation, service load is added that the issuable most of settling amount elimination in back is in the consolidation process process.
The key problem in technology of worker's method of the present invention is: be at the geological conditions of intending the disposal field and the loading condition and the instructions for use of construction project to be built, design and control well the dynamics of giving standard that this worker's method applied and effective construction technological process.For handling above-mentioned soil condition, it gives the dynamics standard and can be controlled in 0.92～0.70 scope, and soil body void ratio or density index are specifically changed before and after especially more employing 0.88～0.75 scope, its available processes.
The pile driving pressure that the present invention applies with the supporting power of giving is that selecting for use of worker's method machinery carried out at the center.With the supporting homemade power of the giving pile press of this worker method two kinds of models only at present: i.e. YJP-30 type and YJP-40 type.Its pile driving pressure is divided into two kinds of 30T and 40T, and corresponding stake footpath is respectively Φ 300mm and two kinds of specifications of Φ 400mm.The long 12m that all is not more than of stake reinforces requirement but can both satisfy effective length.Carry out counterpart and select for use according to planning to build on-the-spot soil condition and superstructure loading condition.Simultaneously, can adopt triangle or foursquare cloth well format.
The technology of the inventive method is suitable for the geological conditions of handling different soil, shows following characteristics:
A) punching, reaming, compacted and pile new technology that static pressure combines;
This piling pipe that gives the power pile press at first is pressed into the soil body and carries out punching (the air in soil body can be discharged from the air vent of piling tube head), but after feeding intake, continues by tube drawing the reaming of exerting pressure, it is compacted with vertically retraining that pile body is subjected to side direction, static pressure arrives the controlling depth pile more at last, thereby can guarantee pile body compactness and lateral confinement condition.
B) the ground stabilization new method of long different inventorys of piles with different and taper pile and straight stake and usefulness;
For adapting to the various demands of soil condition and reinforcing, or even the special requirement in house is set upright in correction, adopted the long and different inventorys of piles with different (by pile cutoff be divided into directly, taper pile feeds intake), make the static pressure pile body of loose material formation especially mainly play a role effectively in the stress layer in the ground stabilization district.Especially, straight stake and taper pile and usefulness can solve preferably that various soil layers are reinforced and the actual needs of foundation pathology accident treatment.
C) can adapt to the ground stabilization different needs can change piling angle and multi-functional supporting giving and defeat the new machinery of stake (a YJP-30 type or a YJP-40 type).This mechanical energy makes things convenient for effective enforcement of novel construction method.
Above characteristics will be come round Realization solid reinforcement effect or satisfy eliminate the multi-functional demand of foundation pathology accident by means of the dynamics control criterion of giving, and the continuous superposition effect of giving dynamics will show the outstanding effect of this worker's method.
Effective enforcement of the inventive method also should improved and complete technology measure.As the leveling in place, roll, the drainage of surface water, loose material is stacked with the reasonable arrangement of the advance and retreat field route of machinery (being the piling order) etc.They all are crucial to the effective enforcement and the quick consolidation effect enhancing of this worker method.
Method of the present invention does not need to satisfy selects special test site to carry out tentative construction earlier, but just a kind of tentative construction practice of pressing pile construction part in advance, can be used to obtain or revise follow-up construction control parameter and quality detecting index with the needed dynamics control criterion of giving of this processing target that reaches, and guide follow-up pressing pile construction.Equally, follow-up pressing pile construction also fibrous root is in time adjusted construction control parameter and quality detecting index according to soil condition variation characteristics, reaches the needed dynamics control criterion of giving of processing target to guarantee follow-up pressing pile construction.
The piling pitch of holes of loose material hydrostatic pressure stake given-force construction method is looked factors such as on-the-spot foundation soil composition, the requirement of soil condition compactness and superstructure load distribution property, presses equilateral triangle or arranged in squares.Its piling pitch of holes can be estimated by above formula (1) or (2).
Characteristics of the present invention are: the inventive method and pile press are particularly suitable for static pressure loose material flexible pile on the weak unfavorable foundations such as saturated soft clay, loose powder fine sand soil, plain fill, miscellaneous fill, collapsible loess, form to give the load-carrying properties that the power composite foundation changes the soil body.Simultaneously, it also is particularly suitable for correction and sets upright house and redemption foundation pathology accident engineering.
The present invention applies the power of giving to being reinforced soil body skeleton, be to apply the power effect of giving for bottom, piling hole and sidewall soil body skeleton according to giving power effect principle, promptly apply flush shear force, extruding force and frictional force, facilitate being reinforced soil body formation stake hole under the synergy of die-cut and extruding; In the segmentation static pressure formation of pile that repeatedly feeds intake, at the bottom of the hole and the sidewall soil body will repeatedly be subjected to compacted effect again, then can repeatedly produce and give power effect synergistic effect, finally reach and give the dynamics control criterion, effectively finish the predeformation and the pre-sedimentation requirement of this loose material hydrostatic pressure stake, thereby guarantee that the safety that satisfies the later stage service load normally uses.
The key of this technology is will be at the load service condition of the soil condition of planning to build the disposal field and construction project to be built, designs and control well the dynamics of the giving standard that this worker's method applied.Concerning the soil condition that this worker method can be reinforced, it gives the dynamics standard and can be controlled in 0.92～0.70 scope.And give the dynamics control criterion with this and obtain machinery selection, construction technology control parameter and the quality detecting index of guaranteeing the power of giving and applying as general objective.
The enforcement skill of this method also should be improved and the supporting technology measure of worker's method.As before the piling to the drainage measure that falls in place, be in the draining drainage measure on the face of land, waters and the backing-off cutting leveling measure in place etc.They all are very useful to the effective enforcement and the consolidation effect enhancing of this worker's method.
Therefore, implementing the principle of " suit measures to local conditions, practical, particular problem is grasped flexibly ", matched piling machinery, and gone to hold in the static pressure process and adapt to the soil layer situation of change and in time adjust construction parameter, will be important problems.
The inventive method is the composite foundation novel construction method that a kind of structure gives power type static pressure loose material flexible pile.It organically combines die-cut and extrusion process, and repeatedly repeats to apply and give power effect pile.Repeatedly construct the gain in strength condition of flexible pile body of composite foundation and inter-pile soil body, will create conditions for reducing and eliminating add up big absolute settlement and the relative settlement that the back produces of coming into operation of whole built-loadings.
Traditional flexible pile composite foundation is to adopt the vibratory drilling method that feeds intake in the pipe outer tube or ram method, and this is unfavorable for constructing in intensive architectural complex.In addition, when underground water level was higher, such worker's method also easily produced very high excess pore water pressure, and the processing consolidation effect is affected.The present invention can avoid its weak point in these areas, adds the controlled condition of the dynamics of giving, and will the load metamorphism proterties of the flexible pile composite foundation of formation is greatly improved, and make this composite foundation stability be able to bigger enhancing.
In a word, this method is according to giving power effect principle (the given-force action principle), repeatedly use is given the power technology and is repeatedly applied flush shear force to being reinforced soil body skeleton, extruding force and frictional force etc. are given the power effect, the dynamics of giving (degree of the given force) controlled condition according to prior design, impel the loose material pile body of static pressure and produced corresponding predeformation by compacted inter-pile soil body, thereby reduce composite foundation soil body hole fast to strengthen its compactness, reach the consolidation process novel construction method that produces corresponding pre-settling amount and eliminate most of posterior settlement amount.
It is more that this method is suitable for the consolidation process great soil group, easy construction, and expense is cheap, and short construction period, and technological parameter adjustment coupling is flexible, and consolidation effect is remarkable.Especially ground basic pathology accident punishment reparation had security reliability and meaning has a far reaching influence.
Description of drawings
Fig. 1 is for handling the piling arrangement of house deviation rectifying.Be that static pressure quicklime reinforcing dilapidated house ground lays out pile
Fig. 2 and enforcement house foundation processing scheme
Straight stake 1, taper pile 2, the house wall base 3 among Fig. 1
The specific embodiment
A) formulate planning of survey
I) to being reinforced the investigation of object:
At first carry out careful complete investigation analysis, grasp and plan to build the load standard and the designing requirement of facility on the ground such as place and road, clearly plan to build the consolidation process classification standard (comprising the index that design will reach) in place.Simultaneously, the serious analysis engineering geological data is seen clearly geologic feature, grasps and handles the degree of depth and process range, formulates the good suitable dynamics of giving control criterion.For Ground Treatment basic pathology accident engineering, also want analysis and judgement and formulate controlling party that the good suitable power of giving applies to.
Ii) to the investigation of the shot filler that uses:
Comprise the compactness standard that proportioning, composition and the Indoor Impaction Test of multiple shot filler (as mulling, gravelly sand, slag, 3: 7 dirt, 2: 8 dirt, quicklime, slags and mix dirt of 10%～15% flyash etc.) can reach, note simultaneously the impurity of shot filler is controlled.
Iii) to site operation and ambient conditions investigation:
Comprise that the above and below ground closes on the importance of building facilities and investigated and analysed apart from the distance of construction machinery and the influence degree that may cause, a basic defining standard be arranged.
Iv) the cause and effect of ground basic pathology accident is investigated: when only this function being used.
B) standard specification of consideration design
Promptly adapt to the nominal value of bearing capacity of composite foundation after soil condition is selected stake a footpath, pilespacing, long and consolidation process for use.During for the pathology accident on Ground Treatment basis, selected processing reaches the specification that lays out pile of repairing standard.
C) formulate processing and reinforce index
Comprise the Bearing Capacity of Composite Foundation characteristic value that the different disposal degree of depth of process range, zones of different should reach, and settlement Control index (absolute settlement, relative settlement and the rate of settling etc.).For Ground Treatment basic pathology accident, also to formulate corresponding reparation index, as the correction standard, tilting value control range etc.
D) consolidation process Scheme Selection
I) the stake type is selected:
Select for use difference and service condition, the taper pile angular dimension that comprise straight stake and taper pile are determined and straight and taper pile matching scheme etc.If during Ground Treatment basic pathology accident, that must improve taper pile and straight stake is used principle and matching scheme, can be referring to several forms shown in Figure 1.
Ii) the stake footpath is selected:
Select for use according to existing two kinds of mechanical models, promptly select any diameter among two kinds of Φ 300mm or the Φ 400mm according to relevant condition.
Iii) stake is long selects with the stake footpath: can consider that respectively different size is to adapt to different reinforcing class requirements by foundation soil soil condition subregion.
Iv) every meter long inventory of stake:
Select for use according to the soil layer geological conditions and in conjunction with the enforceable dynamics standard of giving.For taper pile, should be converted into the inventory that taper pile becomes pile length at every turn.
V) pile body charge ratio:
Form by multiple loose material if pile body feeds intake, then need by Indoor Impaction Test better to guarantee to reach the compactness standard of static pressure then to determine its charge ratio.
Vi) give the dynamics control criterion
This worker method is handled in the great soil group, and the total dynamics of giving control criterion is 0.2～0.70, and distinguishes different great soil group soil conditions and carry out choose reasonable.
E) designing and calculating of loose material static pressed pile
Comprise that the stake number after the rectangular case of stake is determined calculates, the arranged of single pile, the grading control of giving dynamics are calculated, Bearing Capacity of Composite Foundation characteristic value and The deformation calculation etc.If use quicklime (single using or the fusion use), also to calculate the swell increment of static pressure pile pile body, it has once more compacted effect to the soil body.
F) the construction organization design and construction is implemented
Comprise and formulate Construction Plan (material supply plan, manpower and machinery allocation plan, allocation of the labour force plan and construction schedule etc.), determine pressing pile construction scheme (arranging a machinery advance and retreat route and piling order etc.) and technical security quality assurance measure etc.
When putting into practice at last, construction monitoring scheme and construction speed implementation schedule also to have been formulated.Owing to plan to build the heterogeneity that place foundation soil geological conditions shows, often in work progress, have to suitably adjust the piling scheme, thereby generally all need in construction, according to circumstances change and in time adjust the construction speed implementation schedule.Particularly during Ground Treatment basic pathology accident, often need constantly to adjust design scheme and the construction implementation schedule could more meet the engineering actual conditions, also just can receive better technical economic benefit.
G) construction quality inspection and examination
Piling is handled construction and is finished, and then will carry out inspection of quality to its composite foundation according to national technical specification standard related requests such as " building lot treatment technology standards ".After having only inspection of quality qualified, just can handle the delivery receiving acceptance formality and pay the engineering use.
As long as construct when implementing according to the dynamics of the giving control criterion of prior design, general all can satisfy the construction quality requirement, so, in the construction implementation process, effectively control the dynamics of the giving standard of every static pressure pile well, also just can guarantee the one-time-reach-place of construction quality.
[6] analysis of project example
Certain primary school teaching building, lane, three room, city building area has 1500m
2The plane is the zigzag of turnover, as shown in Figure 2.Its ground soil indicator such as table 2 are listed.
When building the building without engineering investigation, only with reference to adjacent building place geological conditions.Reconnoitre brightly after mend, this teaching building ground becomes (see figure 2)s by six layers of local soil type, and level is to very inhomogeneous.Regional area also is mingled with peat horizon, and (natural density is 12kN/m only
3, dry unit weight is 9.1kN/m only
3), its maximum ga(u)ge reaches about 1m.Especially building, the north and south intermediate zone of this teaching building, horizontal bedding changes greatly, and foundation condition is poorer under the annex of railway carriage or compartment.Incline in the distortion south that has occurred wall crazing and Bei Lou in the construction, railway carriage or compartment annex column has broken on the top.Bigger cracking has also appearred in the wall in length and breadth of railway carriage or compartment annex, and up to the concurrent grade layer of opening up of ground facial cleft, existing 3cm is many for its crack Breadth Maximum.
Certain three room, city lane primary school ground soil indicator of table 2
For this reason, in original construction, had to former design Bei Lou is reduced to three layers from four layers of off-load, Nan Lou is reduced to two layers again from three layers, and removes railway carriage or compartment annex staircase, inclines and pushes up bad to the continuation of railway carriage or compartment annex and Nan Lou to reduce Bei Lou distortion south.However, incline and do not stop in the continuation of railway carriage or compartment annex distortion south, records northern building southeast corner distortion Nan Qingyi when watching until the processing of marching into the arena and reach 18cm.
Be to strengthen rectifying effect, in serious analysis on the magnesium lime composition basis of intending using, used the Scheme of Strengthening of static pressure quicklime pile of the present invention.As shown in Figure 3, use the long straight stake of long several taper piles of 7.0m, 6.5m, 5.0m and 4.3m and 7.0m and 4.3m, used the construction of YJP-30 type pile press, and adopted technical measures such as grey amounts of different throwing, the reinforcing of having guaranteed teaching building dilapidated house ground is stable, and has played rectifying effect.
After recovering to use, in less than one-year age, stood twice Changshu earthquake test again in succession.This earthquake magnitude is 5.6 grades, this teaching building from the earthquake centre less than 40km, but normal in safety use the and do not have damage.This is to use this worker method to save one of successful examples of dilapidated house pathology accident.
YJP-30 type that the static pressure equipment choosing is developed voluntarily and YJP-40 type flexible pile Static pressure pile driver, its static pressure is respectively 30T and 40T.Stake directly is divided into two kinds of Φ 300mm and Φ 400mm.Combined factors such as lectotype selection is long according to stake, soil condition and loose material kind are considered to determine.
Repeatedly apply by the power of the giving size of giving dynamics control along the long scope of stake being reinforced the soil body.At first the soil layer application of force is pressed into pore-creating by giving power effect principle by the static pressed pile pipe, apply flush shear force and extruding force, then segmentation feed intake and segmentation apply stamping press and extruding force, facilitate the composite foundation soil body behind the pile to produce compacted predeformation, form this composite foundation reinforcement cushion and bear the superstructure load, original soft soil horizon issuable total settlement power of giving after service load is added up is applied its major part of elimination in the formation of pile, make it after ground is handled, can satisfy better the load metamorphism requirement of engineering operational phase.
Claims (10)
1. loose material hydrostatic pressure stake given-force construction method, the ground stabilization that is applicable to saturated soft clay, loose powder fine sand soil, plain fill, miscellaneous fill or collapsible loess weakness or unfavorable foundation is handled, and it is characterized in that forming the flexible pile composite foundation that gives the power effect with static pressure; Adopt the piling pipe of Static pressure pile driver, make the piling pipe carry out die-cut extruding by hydraulic means to the soil body, utilize static pressure that the piling pipe is sent into and form the stake hole in the soil layer, then behind the tube drawing in established stake hole segmentation feed intake, promptly throw in loose material, throw one section after-applied static pressure of material, by one section pile body of the dynamics of giving control formation of design in advance; Promptly keep and apply the power effect of giving, segmentation precompressed again, one section one section ground pile after outer feeding mode feeds intake in the stake hole to manage being reinforced the soil body around the hole wall; Formation of pile promptly repeatedly applies the power effect of giving to being reinforced the soil body; According to said method, tube drawing → feed intake again → static pressure → static pressure is to face of land pile then more again, and the bamboo joint type that forms a many places hole enlargement successively gives power effect flexible pile; Subsequently, telephone-moving repeats above piling process, forms the flexible pile composite foundation that gives the power effect at last.
2. loose material hydrostatic pressure stake given-force construction method according to claim 1 is characterized in that the described power of giving effect flexible compound ground pile pressing technology process is:
Pile press is assembled start in place---the die-cut soil body formation of piling pipe stake hole---, and tube drawing, input loose material, one section one section static pressure pile---repeats each root piling process---, and piling is finished the machine of tearing open and is removed.
3. loose material hydrostatic pressure stake given-force construction method according to claim 1, it is characterized in that position, piling hole layout adopts equilateral triangle or two kinds of forms of square, utilizes a pile press separate operaton or two pile presss to carry out branch's continuous productive process and finishes.
4. the processing method of the power of giving effect flexible pile composite foundation according to claim 3 is characterized in that its piling pitch of holes is calculated as follows:
Equilateral triangle is arranged
Arranged in squares
In the formula, S-gives power flexible pile composite foundation static pressed pile pitch of holes (m)
D-gives power flexible pile composite foundation static pressed pile footpath (m)
η
0-experience correction factor is selected for use according to the index request of the soil condition that is reinforced the soil body, static pressure size and consolidation process; When reinforcing weakness or unfavorable foundation, η
0Get 1.10～1.22; When Ground Treatment basic pathology accident, η
0Get 1.12～1.30;
γ
0And γ
1-be respectively to be reinforced and handle the soil body severe (kN/m3) of the soil body before and after reinforcing, fetch earth on close limit, piling stake hole and test.
5. loose material hydrostatic pressure stake given-force construction method according to claim 3, the dynamics of the giving control criterion that it is characterized in that utilizing hydraulic means to apply static pressure is in 0.92～0.70 scope; Wherein, the dynamics of the giving standard of newly constructed house ground is controlled at 0.88～0.70 scope; The dynamics of the giving control criterion of Ground Treatment basic pathology accident is controlled at 0.92～0.75 scope.
6. loose material hydrostatic pressure stake given-force construction method according to claim 3 is characterized in that static pressure loose material flexible pile according to requirement of engineering and make straight stake and taper pile, and the angle of depression of taper pile is controlled between 10 °～40 °.
7. loose material hydrostatic pressure stake given-force construction method according to claim 2, the loose material that it is characterized in that the static pressure pile comprise mulling, gravelly sand, slag, 3: 7 dirt, 2: 8 dirt, quicklime, slags and mix the dirt of 10～15% flyash; Particle diameter≤60mm, its compactness standard will be determined at the indoor compaction test of doing earlier.
8. loose material hydrostatic pressure stake given-force construction method according to claim 2 is characterized in that the straight hole 0.6m～1.2m that whenever feeds intake applies static pressure one time; Inclined hole is that the 0.4m～0.8m that whenever feeds intake applies static pressure one time.
9. loose material hydrostatic pressure stake given-force construction method according to claim 3 is characterized in that carrying out the unit operation, jumps the hole construction; Or the two-shipper operation, the construction of staggering realizes the predetermined form that lays out pile.
10. loose material hydrostatic pressure stake given-force construction method according to claim 2 is characterized in that using static pressure to be respectively the pile press of 30T and 40T, and the flexible pile stake of loose material static pressure pile is long≤12m, is deep into effectively to be reinforced in the soil layer.
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| CN103015394B (en) * | 2012-11-28 | 2016-08-31 | 中铁西北科学研究院有限公司 | A kind of friction without casting compaction processing method of soft foundation |
| CN104947665A (en) * | 2015-07-16 | 2015-09-30 | 南通理工学院 | Construction method of bulk material rammed pile composite foundation |
| CN106087957A (en) * | 2016-06-03 | 2016-11-09 | 浙江圣井电力安装工程有限公司 | Power distribution room cable duct anti-settling method is built on a kind of coastal sludge matter soil |
| CN109056852A (en) * | 2018-07-18 | 2018-12-21 | 中国电建集团中南勘测设计研究院有限公司 | Flexible pile composite foundation settlement calculation method based on energy method |
| CN112160313B (en) * | 2020-09-29 | 2022-01-28 | 西安工业大学 | Undisturbed Q4Loess or remolded Q4Loess reinforcing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10259610A (en) * | 1997-03-18 | 1998-09-29 | Mitsui Constr Co Ltd | Periphery reinforcing method for cast-in-place concrete pile |
| CN1337500A (en) * | 2000-08-11 | 2002-02-27 | 萧树棠 | Oil pressure static pile press |
| CN1364961A (en) * | 2002-02-28 | 2002-08-21 | 王光明 | Foundation reinforcing mode |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10259610A (en) * | 1997-03-18 | 1998-09-29 | Mitsui Constr Co Ltd | Periphery reinforcing method for cast-in-place concrete pile |
| CN1337500A (en) * | 2000-08-11 | 2002-02-27 | 萧树棠 | Oil pressure static pile press |
| CN1364961A (en) * | 2002-02-28 | 2002-08-21 | 王光明 | Foundation reinforcing mode |
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