2014 Workshop Presentation Mong coc
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Transcript of 2014 Workshop Presentation Mong coc
![Page 1: 2014 Workshop Presentation Mong coc](https://reader030.fdocuments.in/reader030/viewer/2022032706/55cf94d3550346f57ba4a07d/html5/thumbnails/1.jpg)
Large prefabricated pile foundation,a solution for high-rise buildings in
Ha Noi and HoChiMinh city
Bao Viet NGUYENNational University of Civil Engineering, Hanoi, [email protected]
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A LOT OF BUILDINGS ARE RISING IN HANOI & HOCHIMINH CITY
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BORED PILE FOUNDATION
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Bored piles- Very high bearing
capacity- A lot of mud &
construction trash with a swampy site
- Cost Increased because of environmental treatments
- Construction time might be extended
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Prefabricated piles with large size- High bearing
capacity up to 8000kN
- No construction trash with clean site
- Properly reduce cost and construction time
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APPLICABILITY OF PREFABRICATED
PILES FOUNDATION
Where: Rfea = feasibility ratioQaua = Allowable bearing capacity
of pile foundation on area unit p = total pressure acting on foundation
Rfea = Qaua / p / FSfea
1.0 : high applicability
< 1.0 : low applicapility
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APPLICABILITY OF PREFABRICATED
PILES FOUNDATION
Where: Pa = Allowable bearing capacity of a pile
d = pile size
Qaua = Pa / (3dx3d)
p = 15kPa x number of storeys
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Distribution
maps of
soil types
in area of
old Ha Noi
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Sub-soil type Name Description Distribution
ASingle layer
A1 Clayed soils, up to 30m thick, PI=0.15~0.4, SPT=12~15, E0=10Mpa
West Từ Liêm;Đông Anh
A2 Clayed soils, up to 30m thick, PI=0.35~0.6, SPT=8~12, E0=5~8Mpa Hà Nội center
BTwo
layers
B1
Upper layer: Clayed soils, up to 10m thick, PI=0.15~0.4, SPT=12~15, E0>10Mpa;Lower layer: Medium sand, medium dense, up to 20m thick, SPT30,E0>20Mpa.
North Đông Anh
B2
Upper layer: Clayed soils, 5~10m thick, PI=0.35~0.6, SPT=9Lower layer: small sand, medium dense, up to 20m thick, SPT12, E0>10Mpa;
South Đông Anh and
Thanh Trì; Gia Lâm
CMulti layers with
weak soil
C1
Upper layer: Clayed soils, up to 10m thick, PI=0.15~0.4, SPT=12~15, E0=10Mpa;Middle layer: Organic soils, up to 10m thick, PI>0.8, SPT=5, E0=3~5Mpa;Lower layer: Medium sand, up to 10m thick, SPT30, E020Mpa;
North Đông Anh
C2-3
Upper layer: Clayed soils, up to 10m thick, PI=0.35~0.6, SPT=5~8, E0=6~8Mpa;Middle layer: Organic soils, up to 15m thick, PI>1.2, SPT=2~4, E0=3Mpa;Lower layer: Sandy soil, up to 10m thick, SPT20, E015Mpa;
Đông Anh, Gia Lâm (small
area) Thanh Trì,
South Từ Liêm
Main soil strata types in the area of Ha Noi
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Feasibility ratio of prefabricated square piles for 15 storeys buildings – Hanoi Area
Pile size (cm)
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Feasibility ratio of prefabricated square piles for 20 storeys buildings – Hanoi Area
Pile size (cm)
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Feasibility ratio of prefabricated square piles for 25 storeys buildings – Hanoi Area
Pile size (cm)
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Feasibility ratio of prefabricated square piles for 30 storeys buildings – Hanoi Area
Pile size (cm)
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Distribution
maps of
soil types
in area of
HoChiMinh
city
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Sub-soil Description Distribution
A1
Upper layer: Clayed soils (CuChi, ThuDuc), up to 10m thick, PI=-0.25~0.25, E013Mpa;Middle layer: Clayed soild (Trang Bom), >10m thick, PI=-0.23~0.4; E08Mpa.Lower layer: Medium sand, medium dense, large thickness, E0>20Mpa.
Northern of ThuDuc & CuChi
and a part at central of the city
A2Upper layer: Clayed soils (BInhChanh), up to 10m thick, PI=-0.25~0.25, E013Mpa;Middle and Lower layer are the same as A1
North-western of CuChi and most of
the central
B1
Upper layer: Organic layer (CuChi, ThuDuc), up to 10m thick, PI=1.0~2.5, E01Mpa;Middle layer: Clayed soild (Trang Bom), >10m thick, PI=-0.23~0.4; E08Mpa.Lower layer: Medium sand, medium dense, large thickness, E0>20Mpa.
NhaBe, BinhChanh district,
southern of ThuDuc, South-
Western of CuChi, along SaiGon river and coastal area.B2
Upper layer: Organic layer (CuChi, ThuDuc), up to 20m thick, PI=1.0~2.5, E01Mpa;Middle and Lower layer are the same as B1
B3Upper layer: Organic layer (CuChi, ThuDuc), up to 30m thick, PI=1.0~2.5, E01Mpa;Middle and Lower layer are the same as B1
Main soil strata types in HoChiMinh city
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Feasibility ratio of prefabricated circle piles for 15 storeys buildings – HoChiMinh city
Pile size (cm)
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Feasibility ratio of prefabricated circle piles for 20 storeys buildings – HoChiMinh city
Pile size (cm)
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Feasibility ratio of prefabricated circle piles for 25 storeys buildings – HoChiMinh city
Pile size (cm)
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Feasibility ratio of prefabricated circle piles for 30 storeys buildings – HoChiMinh city
Pile size (cm)
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Case history of 20 storeys twin buildings
45x45cm of piles with bearing capacity of 1800kN
Settlement of about 2cm with 70% design load
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CONCLUSIONS - HANOI
- Large prefabricated pile foundation could be applied to the high-rise buildings up to 30 storeys.
- In Ha Noi, soil types of A1 and B1 are most suitable for prefabricated pile foundation of buildings up to 30 storeys.
- In case of B2, C1 soil types, the applicability of the piles for buildings up to 25 storeys is highly reliable.
- Buildings of 15 storeys and buildings of 20 storeys could be settled on C2-3 and A2 soil types, respectively, with large size of pile (45x45cm and 50x50cm).
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CONCLUSIONS – HOCHIMINH CITY
- In HoChiMinh city, soil types of A1 and A2 are most suitable for prefabricated pile foundation of buildings up to 30 storeys but a careful consideration must be carried out for 30 storeys buildings.
- In case of B1 soil types, the piles foundation could be applied for buildings up to 20 storeys with high reliability.
- Buildings of 15 storeys could be settled on B2 and B3 soil types.
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CONCLUSIONS
- To apply the large prefabricated pile, the construction site must be large enough so that a big driven/jacked rig could have a space to work.
- Using large prefabricated pile could save money because of almost no environmental treatment and using prestressed concrete.
- Last but not least, the construction site was pretty clean therefore the construction works of foundation could be carried out smoothly and the construction time may be reduced.
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THANK YOU FOR
YOUR ATTENTION