CN103352468A - Method for laying rigid long piles and rigid short piles in deep foundation pit support engineering in thick-sludge soft soil area - Google Patents
Method for laying rigid long piles and rigid short piles in deep foundation pit support engineering in thick-sludge soft soil area Download PDFInfo
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Abstract
The invention discloses a method for laying rigid long piles and rigid short piles in deep foundation pit support engineering in a thick-sludge soft soil area. The method comprises the following steps: A, collecting the building and structure construction drawings of the deep foundation pit support engineering to define the building elevation of an excavation surface; B, collecting the geologic reports of the deep foundation pit support engineering to learn the field description records and all physical and mechanical test indexes of the soil layers of a site within the range of influence of the deep excavation of a deep foundation pit; C, adopting analysis software to perform routine computation and analysis to all support sections to determine the diameters and lengths of the support piles and the reinforcing bars of pile bodies, and using a design method that the long piles and the short piles are arranged at intervals to perform check designing to section unit bodies. When the short piles are designed, the inserting depths and the reinforcing bars of the pile bodies as well as the diameters of the short piles are determined according to the local traditional experiences of a construction area. According to the method, not only the requirements of all the safety factors required by the computation of the support section unit bodies are met, but also the gaps between the long piles are filled with the short piles, so that the creep deformation of soil bodies between the support piles is controlled, the concrete consumption of the support piles and the consumption of the reinforcing bars of the pile bodies are reduced; the material cost is greatly lowered.
Description
Technical field
The present invention relates to the rigidity length stake distribution method in a kind of deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering.
Background technology
Along with expanding economy, the quickening of urbanization paces, for satisfying growing citizens' activities, orbit traffic transfer, commercial, the needs of the functions such as parking, at the more nervous dense city center of land used, transforming exploitation Large Underground space in conjunction with urban construction has become a kind of inevitable, such as multilayer basement of high-rise building, underground railway and underground station, road tunnel, underground parking garage, the underground street, the underground store, the underground substation, underground warehouse, underground civil defence fortification and multiple underground civilian and industrial facility etc., in the development and use process of the underground space, deep-foundation pit engineering becomes unavoidable problem.Particularly along with the excavation of pit earthwork, will cause the heavily distribution of foundation ditch periphery resistance to shear of soil strain, and then cause the creeping deformation of the peripheral soil body, when the distortion aggregate-value is larger, just can affect the foundation ditch safety of surrounding environment.How to guarantee basement construction safety, reduce the pit earthwork excavation to the impact of surrounding enviroment, and under the prerequisite that satisfies safety, save as best one can and go along with sb. to guard him construction costs, become the difficult problem that the geotechnical engineering interface is faced.
In Shanghai, zhejiang and other places district with deep soft soil distribution, the system of going along with sb. to guard him that bored pile (rigid pile) adds the cast-in-situ steel reinforced concrete support has obtained using widely.Because this fender body cording has larger rigidity, in Excavation Process, land movement outside the control hole had preferably effect.But this is gone along with sb. to guard him system and also has long construction period simultaneously, goes along with sb. to guard him the high cost shortcoming.
Summary of the invention
Technical problem to be solved by this invention provides and a kind ofly can satisfy the rigidity length stake distribution method of going along with sb. to guard him in the deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering that reduces fender post concrete square amount and pile body arrangement of reinforcement consumption under the prerequisite that the section monomer calculates desired every safety factor.
For this reason, rigidity length stake distribution method in the deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering provided by the invention, comprise A, collect building, the structural working drawing of going along with sb. to guard him the Engineering Service object, the building elevation of clear and definite excavation face, the layout plan that engineering is gone along with sb. to guard him in arrangement; B, collection engineering ground geologic report are fully understood foundation ditch and are dug open-air every physics, the mechanical test index of describing record and soil layer of the interior site soil layers of dark influence basin; C, employing deep foundation ditch calculating analysis software carry out the conventionally calculation analysis to respectively going along with sb. to guard him section, determine fender post stake footpath, the long and pile body arrangement of reinforcement of stake, use the alternate method for designing of length stake that the section unit body is checked design and calculating, when the section computational analysis, only count stake footpath, pile spacing and the arrangement of reinforcement parameter of long stake, accomplish that the long and arrangement of reinforcement of stake footpath, the stake of long stake satisfies the safety factor of going along with sb. to guard him section general safety, overturning or slip resistance analysis safety, anti-protuberance safety etc.; When stub designs, determine pile body insert depth, stake footpath and pile body arrangement of reinforcement by construction location tradition experience.
Rigidity length stake distribution method in the deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering provided by the invention, both satisfied and gone along with sb. to guard him the section monomer and calculate desired every safety factor, use again stub to fill up gap between long stake, controlled the creeping deformation of inter-pile soil body, also help and reduce fender post concrete square amount and pile body arrangement of reinforcement consumption, greatly reduce material cost.
Description of drawings
The support system axis arranged figure that Fig. 1 provides for embodiment 1.
Fig. 2 is length stake plan.
Fig. 3 is conventional design pile body design envelope diagram.
Fig. 4 is that rigidity length stake design pile body of the present invention design comprises figure.
The specific embodiment
Rigidity length stake distribution method in the deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering provided by the invention comprises A, collects building, the structural working drawing of going along with sb. to guard him the Engineering Service object, the building elevation of clear and definite excavation face, the layout plan that engineering is gone along with sb. to guard him in arrangement; B, collection engineering ground geologic report are fully understood foundation ditch and are dug open-air every physics, the mechanical test index of describing record and soil layer of the interior site soil layers of dark influence basin; C, employing deep foundation ditch calculating analysis software carry out the conventionally calculation analysis to respectively going along with sb. to guard him section, determine fender post stake footpath, the long and pile body arrangement of reinforcement of stake, use the alternate method for designing of length stake that the section unit body is checked design and calculating, when the section computational analysis, only count stake footpath, pile spacing and the arrangement of reinforcement parameter of long stake, accomplish that the long and arrangement of reinforcement of stake footpath, the stake of long stake satisfies the safety factor of going along with sb. to guard him section general safety, overturning or slip resistance analysis safety, anti-protuberance safety etc.; When stub designs, determine pile body insert depth, stake footpath and pile body arrangement of reinforcement by construction location tradition experience.
Be positioned at the southeast corner (the many municipal pipelines in roadside, road distribute) of two wild goose roads, Yueqing City Le Cheng town and Dan Xialu intersection such as Fig. 1, commerce services building, Fig. 2 north gate village; The administrative scientific and technological building of Yueqing City the 8th primary school's multilayer, teaching building (vibropile basis) are adjoined in east, place, both sides, south, and surrounding enviroment are complicated.This engineering ± 0.00 is Huanghai Sea absolute altitude 5.05m, and place terrace elevation is 4.60m, i.e. relative elevation-0.45m; Basement bottom board face absolute altitude-4.10m, the thick 400mm of base plate, many pile caps height 1400mm, this excavation of foundation pit degree of depth at the bottom of the cushion cap bed course is that the 5.30m(bed course is in 0.25m).
Engineering geology and hydrogeological situation
Geotechnical investigation report (2003-10-6) according to the establishment of engineering investigation place, Yueqing City Architecture Design Institute, soil layer in the excavation of foundation pit effect of depth scope is followed successively by from top to bottom: (1) plain fill: yellowish-brown, loose, mainly formed by rubble, piece stone, sand and silty clay, bed thickness 1.20～1.50m, local disappearance.(2) clay: brown Huang ~ lark, soft moulding～plastic shape contains a small amount of powder fine sand, ferrimanganic matter tuberculosis and oxidation spots, and the cultivated soil of planting about 0.30m is arranged at top, contains a small amount of plant roots and stems, this soil thickness 1.60～1.70m, full-field distribution.(3
1) mud: steel gray, grey, stream is moulded shape, contains a small amount of powder fine sand, shell fragment and organic matter etc., the thick 17.0 ~ 17.30m of this soil layer, full-field distribution.(3
2) mud: steel gray, grey, stream is moulded shape, contains a small amount of powder fine sand, shell fragment and organic matter etc., the thick 3.90 ~ 5.00m of this soil layer, full-field distribution.(3
3) clay: grey, soft moulding contains a small amount of powder fine sand, charing canebreak etc., this layer thickness 1.30～2.70m, full-field distribution.(4
1) contain the silty clay gravelly sand: gray purple, loose, the cobble particle (particle diameter〉20mm) account for 15～20%, general grain diameter 20～70mm, a few granules particle diameter〉70mm, (particle diameter 2～20mm) accounts for about 15% the circle gravel, particle shape is time corner angle, inferior circular, decomposed rock among the Shi Zhiwei, sand account for about 30%, and all the other are as soft molding powder matter clay take medium sand as the master.This is thick 0.90～3.30m layer by layer, local disappearance.(4
2) the circle gravel: gray purple, loose～slightly close shape, cobble (particle diameter〉20mm) particle accounts for about 42%, and particle is take 20～60mm as main, a small amount of particle diameter is greater than 60mm, (particle diameter 2～20mm) particles account for about 34.4% the circle gravel, and particle shape is take subangular, inferior toroidal as main, decomposed rock among the Shi Zhiwei, sandy soil accounts for 10～15%, take medium coarse sand as main, inferior is fine sand, and all the other are the silty clay of soft moulding～plastic shape.The soft molding powder matter clay of round gravel negligible amounts is contained in this layer part, is lens and distributes.This is thick 2.90～3.70m layer by layer.(5) clay: grey, soft moulding contains a small amount of powder fine sand, and the part contains a small amount of round gravel, half charing canebreak, grey hickie group, spot etc., this layer thickness 1.10～1.80m.(6
1) contain silty clay circle gravel: lark, loose～slightly close, the cobble particle (particle diameter〉20mm) account for 15～20%, general grain diameter 20～60mm, a few granules particle diameter〉100mm, (particle diameter 2～20mm) accounts for about 15～20% the circle gravel, particle shape is time corner angle, inferior circular, decomposed rock among the Shi Zhiwei, sand account for about 15%, and all the other are silty clay.This is thick 0.90～1.60m layer by layer, and only there is distribution the part.(6
2) circle gravel: grey purple～yellow, slightly close～in close, the cobble particle accounts for 17.9～31.1%, grain diameter is take 20～70mm as main, the a few granules particle diameter is greater than 150mm, and (particle diameter 2～20mm) accounts for 25.4～45.5% to circle gravel particle, and particle shape is inferior circle, subangular, decomposed rock among the Shi Zhiwei, sand accounts for 15%, and take medium coarse sand as main, inferior is fine sand, all the other are soft molding powder matter clay, and the part is contained the less bury lens of gravel ovum particle and distributed.This aspect buried depth 30.7～33.2m, bed thickness 7.10～7.90m.
Following table is the physical mechanical property index of each soil layer
Each soil layer physical mechanical property index table 1
Annotate: the numerical value in () is for calculating value
C,
ФValue is for cutting soon index
According to the geologic report reflection, this place superficial part is for composing the porosity diving that is stored in clay, mud, and runoff conditions is poor, and the water yield is little.The groundwater level buried depth is shallow, records approximately 0.10 ~ 1.70m of groundwater level depth during the prospecting, mainly is subjected to Atmospheric precipitation and surface water to infiltrate supply, and groundwater table is subjected to the impact of Atmospheric precipitation.Place underground water has microcorrosion to concrete.
The type selecting of supporting and protection structure and comparison:
(1), support characteristic:
1, the engineering outer wall of basement is near apart from land red-line, and west, north side road have municipal pipeline to distribute more, and vehicle flowrate is intensive, and east, southern side are Yueqing City the 8th primary school, and the place surrounding enviroment all need be laid special stress on protecting.Space enclosing structure should have preferably rigidity, is conducive to control the displacement of the outer soil body in hole.
2, excavation of foundation pit face and the end, hole be positioned at water content up to 74.7%, stream moulds shape, deep silt soil that mechanical index is low, for guaranteeing that space enclosing structure is stable, going along with sb. to guard him pile body should have larger insert depth, and the passive area soil body need carry out consolidation process, also should take measures to prevent the generation of stream soil between stake.
(2), scheme determines
Consider this support engineering characteristics, the suitable bored pile that adopts of space enclosing structure adds the reinforced concrete support system one, simultaneously the passive area soil body is carried out cement mixing method, and increase by one draining earth agitation pile curtain prevents that inter-pile soil runs off outside drilled pile.
1, the design of support system:
This engineering basement area 711.47m
2, basement foundation ditch girth 125m, the support system axis arranged as shown in Figure 1:
Establish altogether 1 road and support, support the structure design data as follows:
| Support numbering | Width (mm) | Highly (mm) | The structure top mark is high | Arrangement of reinforcement |
| Guan Liang (GL) | 1000 | 700 | -1.45m | 7φ20 |
| Main support (ZC1) | 700 | 700 | -1.45m | 5φ20 |
| Link support (ZC2) | 600 | 600 | -1.475m | 4φ20 |
2, the long design of agitation pile stake:
Agitation pile is divided into active region fender post and the stake of passive area reinforcing body, and the pile body design data is as follows:
| The pile body type | Stake top mark high (m) | Stake end absolute altitude (m) | Effective length (m) |
| The active region fender post | -1.00 | -7.75 | 6.75 |
| The stake of passive area reinforcing body | -4.75 | -11.45 | 7.00 |
3, the design of bored pile:
1), conventional design:
The pile body design data is as follows:
With reference to Fig. 3 and from 1) analyze because this project place soft mud is deep, water content is high, mechanical index is poor, when not penetrating mud soil at the bottom of the Pile, the checking computations of section resistance to overturning only are 0.96, much smaller than the requirement of standard 1.30 safety factor; Until penetrate soft mud at the bottom of the bored pile, enter 3
3Clay and 4
1When containing the silty clay sandy gravel stratum, the general safety coefficient is just met the demands, and reaches rapidly 2.54 safety factor; Obtain thus going along with sb. to guard him Pile and reach 25.65m.Although the design of fender post has reached code requirement, but the embedding ratio λ of fender post goes along with sb. to guard him design experiences value 1.80～2.50 much larger than Wenzhou Area, so that the pile body unit price, has improved the expense of going along with sb. to guard him of this project greatly up to 8850 yuan, can not satisfy the requirement of space enclosing structure economy.
The superelevation cost irrationality that produces in view of this project campshed fender body conventional design, the designer by with expert's communication, and the successful experience of the reference Pan Linyou of Wenzhou University professor " " Rigid Long-Short-Pile Composite Foundation " design theory and application study " literary composition, the application mentality of designing of rigidity length stake in this base pit engineering proposed, by design, calculating, the method can not only make the system of going along with sb. to guard him satisfy that overturning or slip resistance analysis, antiskid move, the requirement of monolithic stability, has also obtained preferably economic effect.
2), rigidity length stake design:
As shown in Figure 2:
The pile body design data is as follows:
With reference to Fig. 4, this section is gone along with sb. to guard him every 1 mode with length stake 1, and section calculates with long stake, and namely bored pile φ 7001900, pile body insert depth 22.00m, general safety coefficient 2.41; Stub is arranged as bored pile φ 7001900, just fills up long stake gap, and the pile spacing of section or 250mm add the outer agitation pile curtain of fender post like this, can play and end preferably native effect.The insert depth of stub is according to the design experiences of Wenzhou Area, and namely λ=2.07 are designed, and is entirely carried on a shoulder pole by long pile when designing because of soil pressure, and the design of stub is only considered as safety stock.If engineering is taked the supporting type of length stake, the expense of pile body will be reduced to 86.85 ten thousand yuan by 109.73 ten thousand yuan, and the bored pile unit price is reduced to 7004 yuan by 8850 yuan, and the minimizing amplitude reaches 20.86%, and economic impacts is obvious.And the construction period of stub compare long stake and will shorten, the mud contamination of construction generation is few, the social benefit of generation is also obvious.
Deep because of the soft mud in this Deep Foundation Pit excavation influence basin, surrounding enviroment require highly to foundation pit system, do not allow land movement outside the larger hole, and foundation pit side-wall should be by 1.10(one-level foundation ditch) safety factor carry out designing and calculating.If design according to traditional design methods, the campshed fender body will need larger insert depth, the long pile body of going along with sb. to guard him, thus produce larger construction costs.The art of this patent gains enlightenment from the utilization of rigidity length stake composite foundation, the design concept of rigidity length stake is incorporated in the bracing of foundation pit design, through design, calculation and comparision, this method for designing can not only satisfy each safety factor requirement of Foundation Pit Support Design, can also produce considerable economic benefit and social benefit, the summary achievement of this paper can be applied to similar regional engineering fully.
Claims (1)
1. the rigidity length stake distribution method in the deep In Soft Muddy Soil Region Deep Foundation Pit Supporting Engineering, it is characterized in that: comprise A, collect building, the structural working drawing of going along with sb. to guard him the Engineering Service object, the building elevation of clear and definite excavation face, the layout plan that engineering is gone along with sb. to guard him in arrangement; B, collection engineering ground geologic report are fully understood foundation ditch and are dug open-air every physics, the mechanical test index of describing record and soil layer of the interior site soil layers of dark influence basin; C, employing deep foundation ditch calculating analysis software carry out the conventionally calculation analysis to respectively going along with sb. to guard him section, determine fender post stake footpath, the long and pile body arrangement of reinforcement of stake, use the alternate method for designing of length stake that the section unit body is checked design and calculating, when the section computational analysis, only count stake footpath, pile spacing and the arrangement of reinforcement parameter of long stake, accomplish that the long and arrangement of reinforcement of stake footpath, the stake of long stake satisfies the safety factor of going along with sb. to guard him section general safety, overturning or slip resistance analysis safety, anti-protuberance safety etc.; When stub designs, determine pile body insert depth, stake footpath and pile body arrangement of reinforcement by construction location tradition experience.
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| CN104404964A (en) * | 2014-10-15 | 2015-03-11 | 中建四局第六建筑工程有限公司 | Four-synchronous-operation excavation and support construction method for deep and large foundation pit containing thick mud layer |
| CN107587511A (en) * | 2017-10-17 | 2018-01-16 | 中冶集团武汉勘察研究院有限公司 | For preventing and administering the long-short pile ruggedized construction and reinforcement means of foundation ditch bottom heave |
| CN108468335A (en) * | 2018-03-26 | 2018-08-31 | 华东交通大学 | A kind of non-isometric combined enclosure stake design method |
| CN111827268A (en) * | 2020-06-15 | 2020-10-27 | 湖北文理学院 | Long and short pile composite foundation design method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104404964A (en) * | 2014-10-15 | 2015-03-11 | 中建四局第六建筑工程有限公司 | Four-synchronous-operation excavation and support construction method for deep and large foundation pit containing thick mud layer |
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| CN107587511A (en) * | 2017-10-17 | 2018-01-16 | 中冶集团武汉勘察研究院有限公司 | For preventing and administering the long-short pile ruggedized construction and reinforcement means of foundation ditch bottom heave |
| CN108468335A (en) * | 2018-03-26 | 2018-08-31 | 华东交通大学 | A kind of non-isometric combined enclosure stake design method |
| CN111827268A (en) * | 2020-06-15 | 2020-10-27 | 湖北文理学院 | Long and short pile composite foundation design method and device |
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Application publication date: 20131016 |