Cot voi va voi xi mang - Chi dan thiet ke, thi cong va giam sat du an

• HOI DIA KY THUAT THUY DIEN " BAo cAo SGF 4:95 E • COT VOl vA VOl XI MANG cHi: DAN TmtT K£, THI CONG vA GIAM SAT Dl! AN THl)Y DIEN 1997 A .? _ HOI DIA KY THUAT THUY DIEN BAo cAo SGF 4:95 E _ - -C ­ ­ COT V6I VA V6I XI MANG ~:;: ,,' " ,," ~'" , CHI DAN THIET KE, THI CONG VA GIAM SAT DU AN I o THl,lY BIEN 1997 Trong nhung nam gan day d5 e6 SL.T t.flng trnong Ia n Slr dl,lng cae c~t v6i va v6i xi m~ng Trong nhung nam 1970 trung billh hang nam thi eong khoang 50.000 m Trong nhfrng nAm 1980 vi~c sir d~ng chung da lang len va nam 1990 tru ng blnh hang flAm khoilIlg 600.000 m SI! gia tang nhfrng nam 1980 chu yeu xily linh vl,l"c x:l.y dims duong b9 B~t dau nhfrng nam 1990 dau tu eho h~ tang ca duong b¢ va duang sAt deu tang va ket qua Hl nam 1994 da thi eOng t6ng cqng 3,7 tri?u m cQl Phan 16n sl,l" gia tang xay cae Ilnh vl!e xay dvng nen duong bq va nen dlrong sAt va cae cau nhc d~ng kh ung hqp Khoang 90% di"i duqc Slr dl,lng troog ba Iinh v1!c {ren o PhuO'rlg phar thung trung binh ph