CN104060624A - Method for arranging pile foundations in complex soft soil foundation - Google Patents

Method for arranging pile foundations in complex soft soil foundation Download PDF

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Publication number
CN104060624A
CN104060624A CN201410307242.5A CN201410307242A CN104060624A CN 104060624 A CN104060624 A CN 104060624A CN 201410307242 A CN201410307242 A CN 201410307242A CN 104060624 A CN104060624 A CN 104060624A
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CN
China
Prior art keywords
pile foundation
foundation
pile
isohypse
length
Prior art date
Application number
CN201410307242.5A
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Chinese (zh)
Inventor
施毅
徐林海
陈永伟
唐建忠
陈哲
高策
Original Assignee
温州电力设计有限公司
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Application filed by 温州电力设计有限公司 filed Critical 温州电力设计有限公司
Priority to CN201410307242.5A priority Critical patent/CN104060624A/en
Publication of CN104060624A publication Critical patent/CN104060624A/en

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Abstract

The invention relates to the field of constructional engineering and particularly relates to a method for arranging pile foundations in a complex soft soil foundation. The invention adopts the following specific technical scheme that the method for arranging the pile foundations in the complex soft soil foundation comprises the following steps of: uniformly drawing contour lines on the foundation; arranging pile foundation piling positions on the foundation on which the contour lines are drawn and carrying out trial piling to extract a rock sample in the foundation; measuring distances between the contour lines and an elevation of a region and selecting the depth that each pile foundation is piled into a rock fundamental plane; measuring a perpendicular length of positions between each two adjacent contour lines, which pass through the center point of the position of the pile foundation, and a perpendicular length between each contour line and the center point of the position of the pile foundation; and dividing the value of the perpendicular length between each contour line and the center point of the position of the pile foundation by the value of the perpendicular length of the positions between each two adjacent contour lines, which pass through the center point of the position of the pile foundation, so as to determine the elevation of a pile tip. The invention adopts the technical scheme and provides the method for arranging the pile foundations in the complex soft soil foundation, which can be used for testing the arrangement depth of the pile foundations in the complex soft soil foundation, enable a building not to be settled and enable intensity to be improved.

Description

The method to set up of complex soft soil pile foundation
Technical field
The present invention relates to a kind of building engineering field, particularly a kind of method to set up of complex soft soil pile foundation.
Background technology
Be subject to the restriction in soil, the transformer station that coastal area is built in soft foundation gets more and more.In order to meet requirement of strength and sedimentation restrictive condition, pile foundation is widely used in the basis of transformer station's building.Thereby the quality direct relation of pile foundation the safe operation of transformer station.And be the soft foundation of inclination basement rock for substratum, the bearing course at pile end of pile foundation and enter the rock degree of depth directly determining stake quality.
Through the continuous test of these those skilled in the art and research and development, transformer station building foundation long stake processing in can adopting in soft foundation.For simple, the conventional soft foundation of geological conditions, unit in charge of construction can quick clear and definite designing requirement, completes pile foundation construction by designing requirement.But, to the soft foundation of some complex geologic conditions, if substratum is the soft foundation of inclination basement rock, design scheme all cannot be clearly implemented in unit in charge of construction and management, make to arrange transformer station and become very difficulty on complicated soft foundation, strength problem and the settlement issues of transformer station also cannot obtain comparatively perfect processing simultaneously.
Summary of the invention
The deficiency existing for prior art, the invention provides a kind of pile foundation of can testing in complex soft soil and the degree of depth is set, makes building that the method to set up of the complex soft soil pile foundation that sedimentation, intensity be improved not occur.
For achieving the above object, the invention provides following technical scheme: a kind of method to set up of complex soft soil pile foundation, its step is as follows: first on the ground that needs construction of buildings, draw and establish isohypse uniformly, the spacing between each isohypse equates; Then need to be provided with on isocontour ground and arrange that pile foundation sets position at picture according to the load-bearing of fabrication, it is characterized in that: a, extract the rock sample in ground by test pile, penetration rate in conjunction with when piling is also analyzed the rock sample extracting, and determines the batholith face of ground with this; Spacing between b, mensuration isohypse and this region elevation, selected pile foundation is squeezed into the degree of depth of batholith face; C, measure between two adjacent isohypses through the length between perpendiculars of pile foundation place-centric point and the length between perpendiculars of the central point of isohypse and pile foundation position wherein; D, by between two adjacent isohypses through the numerical value of the length between perpendiculars of pile foundation place-centric point the length between perpendiculars numerical value divided by the central point of isohypse and pile foundation position, then add the numerical value of spacing between isohypse and this region elevation and deduct and select pile foundation and squeeze into the depth value of batholith face and both can learn an elevation of holding.
Wherein, the penetration rate when piling in step a is the special speed that enters rock stratum that turns drill bit in rig.
Adopt technique scheme, in test pile process, rock sample is extracted, observe the color of rock sample of extracting and carry out auxiliary judgement horizon d, consider bit penetration and rock sample comparative analysis simultaneously, short and sweet must solve in complex soft soil in the judgement of weathering batholith face.And in utilizing, pile foundation length is estimated in the position of weathering batholith face isohypse and pile foundation, has ensured that the full section of pile foundation enters the degree of depth of middle weathering batholith face, has ensured the stability of pile foundation; Not only can ensure the construction quality of pile foundation, and be convenient to determine accurately the length of each pile foundation, for follow-up construction provides favourable condition.
Below in conjunction with accompanying drawing, the invention will be further described.
Brief description of the drawings
Fig. 1 is that in the embodiment of the present invention, pile body is squeezed into the structural representation in horizon d;
Fig. 2 is the middle weathered rocks end face contour map in the embodiment of the present invention with pile layout.
Detailed description of the invention
The method to set up of a kind of complex soft soil pile foundation as shown in Figure 1 and Figure 2, its step is as follows: first on the ground that needs construction of buildings, draw and establish isohypse uniformly, the spacing between each isohypse equates; Then need to be provided with on isocontour ground and arrange that pile foundation sets position at picture according to the load-bearing of fabrication, a, extract the rock sample in ground by test pile, penetration rate in conjunction with when piling is also analyzed the rock sample extracting, and determines the batholith face of ground with this; Spacing between b, mensuration isohypse and this region elevation, selected pile foundation is squeezed into the degree of depth of batholith face; C, measure between two adjacent isohypses through the length between perpendiculars of pile foundation place-centric point and the length between perpendiculars of the central point of isohypse and pile foundation position wherein; D, by between two adjacent isohypses through the numerical value of the length between perpendiculars of pile foundation place-centric point the length between perpendiculars numerical value divided by the central point of isohypse and pile foundation position, then add the numerical value of spacing between isohypse and this region elevation and deduct and select pile foundation and squeeze into the depth value of batholith face and both can learn an elevation of holding.Penetration rate when piling in step a is the special speed that enters rock stratum that turns drill bit in rig.In such scheme, in test pile process, rock sample is extracted, observe the color of rock sample of extracting and carry out auxiliary judgement horizon d, consider bit penetration and rock sample comparative analysis simultaneously, short and sweet must solve in complex soft soil in the judgement of weathering batholith face.And in utilizing, pile foundation length is estimated in the position of weathering batholith face isohypse and pile foundation, has ensured that the full section of pile foundation enters the degree of depth of middle weathering batholith face, has ensured the stability of pile foundation; Not only can ensure the construction quality of pile foundation, and be convenient to determine accurately the length of each pile foundation, for follow-up construction provides favourable condition.
As shown in Figure 2, enter the rock degree of depth for what ensure pile foundation, crucially need to ensure that the full section in pile foundation bottom stretches into the degree of depth of batholith face.Unit in charge of construction judges that according to the penetration rate of drill bit in trial assembly and piling special equipment boring enters batholith face, because batholith face tilt is larger, if continue on this basis to stretch into 0.8m, can not guarantee that stake and basement rock interface lowest part and stake end are apart from 0.8m, even if continue to stretch into 1.2m also not necessarily, because the inclination angle difference of batholith face, the stake end 1 required degree of depth stretching into is just different.In order to address this problem, the present invention proposes according to the batholith face long method of line estimation stake of ascending a height, taking Fig. 2 as example, pile foundation position X is between isohypse X1 and isohypse X2, through adjacent two isohypses in X center, pile foundation position, be that line segment AB is two isocontour approximate normals, AB through pile foundation place-centric and with stake limit intersect at C point.Can think that C point is stake and the minimum point of middle weathering batholith face 2 intersections.And spacing between isohypse X1 and this area's elevation is-23m, can data measured AB=3.7422, AC=2.427; Then, middle weathering batholith face 2 elevations of estimation Fig. 2 king-pile are-23+2.427/3.7422=-22.35.
As can be seen here, the elevation of the stake end 1 of stake was both-22.35-0.8=23.15m.

Claims (2)

1. a method to set up for complex soft soil pile foundation, its step is as follows: first on the ground that needs construction of buildings, draw and establish isohypse uniformly, the spacing between each isohypse equates; Then need to be provided with on isocontour ground and arrange that pile foundation sets position at picture according to the load-bearing of fabrication, it is characterized in that: a, extract the rock sample in ground by test pile, penetration rate in conjunction with when piling is also analyzed the rock sample extracting, and determines the batholith face of ground with this; Spacing between b, mensuration isohypse and this region elevation, selected pile foundation is squeezed into the degree of depth of batholith face; C, measure between two adjacent isohypses through the length between perpendiculars of pile foundation place-centric point and the length between perpendiculars of the central point of isohypse and pile foundation position wherein; D, by between two adjacent isohypses through the numerical value of the length between perpendiculars of pile foundation place-centric point the length between perpendiculars numerical value divided by the central point of isohypse and pile foundation position, then add the numerical value of spacing between isohypse and this region elevation and deduct and select pile foundation and squeeze into the depth value of batholith face and both can learn an elevation of holding.
2. the method to set up of complex soft soil pile foundation according to claim 1, is characterized in that: penetration rate when piling in step a is the special speed that enters rock stratum that turns drill bit in rig.
CN201410307242.5A 2014-06-30 2014-06-30 Method for arranging pile foundations in complex soft soil foundation CN104060624A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105653811A (en) * 2016-01-11 2016-06-08 重庆市送变电工程有限公司 Rocked depth determining method for high voltage transformer substation deep back filled region rotary excavation drilling
CN105887941A (en) * 2015-01-20 2016-08-24 黄新福 Pile foundation pile length measuring and calculating method

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CN202347545U (en) * 2011-11-01 2012-07-25 中国建筑第八工程局有限公司 Rock-entering determination system for pile foundation
CN103074903A (en) * 2013-01-28 2013-05-01 中国水电顾问集团西北勘测设计研究院 Pile casing type cast-in-place concrete pile for fan foundation in soft foundation of shoal or quicksand area
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Publication number Priority date Publication date Assignee Title
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JP2008144562A (en) * 2006-12-12 2008-06-26 Jfe Civil Engineering & Construction Corp Spherical surface contact type rotation slip support and underground buried pile method in support body pile head
CN202347545U (en) * 2011-11-01 2012-07-25 中国建筑第八工程局有限公司 Rock-entering determination system for pile foundation
CN103374911A (en) * 2012-04-23 2013-10-30 中交路桥北方工程有限公司 Large-diameter drilled pile hard-rock construction method
CN103074903A (en) * 2013-01-28 2013-05-01 中国水电顾问集团西北勘测设计研究院 Pile casing type cast-in-place concrete pile for fan foundation in soft foundation of shoal or quicksand area

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105887941A (en) * 2015-01-20 2016-08-24 黄新福 Pile foundation pile length measuring and calculating method
CN105653811A (en) * 2016-01-11 2016-06-08 重庆市送变电工程有限公司 Rocked depth determining method for high voltage transformer substation deep back filled region rotary excavation drilling
CN105653811B (en) * 2016-01-11 2019-03-01 重庆市送变电工程有限公司 Enter rock depth determination method in high voltage substation depth back filled region rotary digging drilling

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Application publication date: 20140924