Piled Raft Foundation• Raft Foundation ဆိုတာ

Piled Raft Foundation•
Raft Foundation ဆိုတာ
Mat Foundation ပါပဲ

အ ေခၚအ ေဝၚခြဲထားတာက
Mat Foundation ရဲ႕ ေအာက္မွာ
Pile ေတြ ေထာက္ထားရင္ ကြဲျပားေအာင္
Raft Foundation လို႕ေခၚပါတယ္
Function လဲ ကြာလို႕ပါ
‪#‎Why‬ ... Use?
Site Soil Condition က
soft compressible ‪#‎Clay‬ မ်ားျပီး
Water Table ကလဲ Ground Level နဲ႕နီးတ့ဲအခါ
Hard Stratum ေအာက္အမာ Level ကလဲ
Level မညီပဲ Sloping ျဖစ္ေနတ့ဲအ ေျခ အ ေနမ်ိဳးမွာ
Shallow Foundation အမ်ိဳးအစားျဖစ္တ့ဲ
Mat Foundation တစ္ခုထဲနဲ႕တင္
အ ေဆာက္အဦရဲ႕ Settlement ကိုထိန္းဖို႕မႏိုင္ ေတာ့ပါ ....
Mat Foundation ရဲ႕မူလ အားသာခ်က္ျဖစ္တ့ဲ
(1) Uniform Settlement မ ေသခ်ာႏိုင္ ေတာ့တ့ဲအျပင္
Foundation Design မွာ ေၾကာက္စရာေကာင္းတ့ဲ
(2) Differential Settlement ပါ
ျဖစ္လာႏိုင္ တ့ဲ အ ေနအထားမ်ိဳးမွာ
Deep Foundation အမ်ိဳးအစားျဖစ္တ့ဲ
Pile ေတြက Shallow Foundation ျဖစ္တ့ဲ
Mat ကို လာေထာက္ေပးပါတယ္
အ့ဲဒါက Piled Raft Foundation ပါ
Definition ဖြင့္ ရ ရင္ ေတာ့
Piled Raft Foundation ဆိုတာ
Shallow Foundation နဲ႕ Deep Foundation
ႏွစ္မ်ိဳးလံုးေပါင္းထားတ့ဲ ရွားပါး Foundation Design ပါပဲ
point to remember:
Piled Raft Foundation မွာပါတ့ဲ
‪#‎Raft‬ က ေတာ့ နဂို Mat အတိုင္းသာ အလုပ္လုပ္ပါတယ္ ...
(ဒါေပမယ့္ ေအာက္က အ ေထာက္
Pile ေတြရွိလာတ့ဲအတြက္
Mat ခ်ည္းပဲသက္သက္ထက္စာရင္
ထည့္ရတ့ဲ Steel ေလ်ာ့လာလိမ့္ပါမယ္)
Piled Raft Foundation မွာပါတ့ဲ
‪#‎Pile‬ ေတြက ေတာ့ တျခား Pile Design ေတြလို
Super-structure ကက်လာမယ့္
Majority Load ေတြကို ထမ္းဖို႕ အဓိကမဟုတ္ပါဘူး
သူထမ္းေပးထားတ့ဲ Mat/ Raft ကို
Differential Settlement မျဖစ္ေစဖို႕
အဓိက ေထာက္ထားေပးတာပါ
ဒါေၾကာင့္ ဒီ Pile ေတြကို#Settlement
‪#‎Reducer‬ လို႕ေခၚပါတယ္ .. ဒါကမွ
သူ႕ရဲ႕ Primary Purpose ပါ
အႏွစ္ခ်ဳပ္ ရရင္ ေတာ့
Piled Raft Foundation ဆိုတာ
Raft ရယ္ ... Piles ရယ္ ... Soil ရယ္
အဓိက Bearing Member-3 မ်ိဳးေပါင္းထားတ့ဲ
Composite Foundation Structure တစ္ခုပါပဲ
က်ေနာ္တို႕Taunggyi Myoma Tower Project မွာသံုးထားတာက
Bored Pile & Raft Foundation ပါ
တန္ဖိုးရွိတ့ဲအခ်ိန္ေတြေပးျပီးဖတ္တာ
ေက်းဇူးတင္ ပါတယ္ ခင္ ဗ်ာ
မွ်ေဝတယ္ဆိုတာ မဂၤလာတစ္ပါးပါ
AUNG MYAT THU(TU-MES, Taunggyi)
Reference:
Performance of Pile Raft Foundation
in case of inadequate pile capacity
M.E. Thesis by Ma Zar Lee Tint
C.2(January, 2010) TU-Magway
The piled raft foundation is an
effective foundation concept used
to ‪#‎minimize‬ total settlement and
differential settlement, to ‪#‎improve‬
the bearing capacity of a shallow foundation
and to ‪#‎reduce‬ in an economical way
the initial stress level and benging moments of a raft.
Piled raft foundation is an economical potion
for circumstances where the performance of
the raft alone does not satisfy
the requirements.
For most piled raft foundations,
the primary purpose of the piles
is to act as •settlement reducers•.
Unlike conventional piled foundation design,
in which the piles are designed
to carry the majority of the load,
the design of a piled-raft foundation allows
the load to be shared between
the raft and piles.
The concept of piled raft foundation
combines the bearing elements
piles, raft and soil in a composite structure.

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