လူငယ္အင္ယာ/grouting specialist မ်ားအတြက္ပါ။
Ground treatment အတြက္ Jet grouting method
အသံုးျပဳမႈကို Geotechnical လိုအပ္ခ်က္နဲ႔ရည္ရႊယ္ခ်က္
အရ အမ်ိဳးမ်ိဳးရွိပါတယ္။
ျမန္မာႏိုင္ငံမွာေတာ့ Basement construction မွာ
အသံုးျပဳၾကတာေတြ႕ရလို႔ဆက္စပ္တာေျပာခ်င္ပါတယ္။
ဒီမွာေရာေထြးေနတာက-
- ground water seepage prevention အတြက္လား??
- structure capacity လိုအပ္ခ်က္အတြက္လား??
တစ္ခ်ိဳ႕ design (အထူးသျဖင့္ chinese design) ေတြမွာမသဲကြဲဘူး။
ဆိုလိုတာက jet grouting method ဟာ any soil (any grained size) မွာသံုးလို႔ရပါတယ္။
application လိုအပ္ခ်က္အေပၚမူတည္ၿပီး လိုအပ္တဲ့ jet pressure, velocity, grout viscosity, grouting rate, grouting method (single or double or triple)
စသျဖင့္လိုအပ္တဲ့ machine specification ေျပာင္းရံုပါဘဲ။
သို႔ေပမဲ့ ရရွိတဲ့ grouted soil ရဲ႕properties (သို႔)
compressive strength ကေတာ့ soil type
အေပၚမူတည္ပါတယ္။
ဒါေၾကာင့္ basement construction လုပ္ငန္းမွာ
ဘယ္လိုအသံုးခ်မလဲဆိုတာ အဲဒီ site specific
condition of soil type ကိုၾကည့္ရမွာပါ။
တစ္ခ်ိဳ႕ site ေတြမွာ ေတြ႕ရတာ Contiguous bored piles
ၾကားမွာ jet grouting လုပ္တာ ground water seepage prevention အတြက္ဘဲလား?? grouted soil ရဲ႕ structural capacity အေရးႀကီးၿပီလား??
အေပၚပိုင္းမွာ ခံႏိုင္ရွိေပမဲ့ excavation depth မ်ားလာရင္
structure capacity စဥ္းစားဖို႔လိုအပ္လာပါမယ္။
ground pressure, ground water pressure,
excavation depth အေပၚ လိုအပ္ခ်က္အရ
grouted soil ရဲ႕ လိုအပ္တဲ့ compressive strength
စဥ္းစားတြက္ခ်က္ရမွာပါ။ Design ထဲမွာ grouted soil
ရဲ႕ specification ပါရွိရပါမယ္။
ဥပမာ- စမ္းသပ္ခ်က္အရ ထရိတ္တားေဟာ္တယ္
jet grouted soil ဟာ uniaxial compressive
strength 3-5 MPa ရွိပါတယ္။
ဒါက seepage prevention အတြက္ပါ။
တကယ္လို႔ Structural capacity လိုအပ္ရင္
လိုအပ္တဲ့ capacity ရေအာင္ site ထဲမွာ
ျပဳလုပ္ႏိုင္ရပါမယ္။
design လိုအပ္ခ်က္ရေအာင္ core drill လုပ္ၿပီး
စမ္းသပ္ေပးသင့္ပါတယ္။
ဗဟုသုတ အေနနဲ႔ ေျပာခ်င္တာက jet grouting ကို
any soil type မွာသံုးလို႔ရတယ္လို႔သာမန္
အားျဖင့္ေျပာႏိုင္ေပမဲ့ တကယ့္လက္ေတြ႕မွာ
design လိုအပ္ခ်က္ရႏိုင္/မရႏိုင္
အေရးႀကီးပါေၾကာင္း။
ေတြ႕တာေလးမွ်ေဝတာပါ။
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Thanks for sharing
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Thanks friend
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Good technology
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