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?????? ??? ?????? ??? ???? ????? ??? ??? ????600 ??? ???? ??? ????? 9.3?.? ???? ???? ?????? ????? ??? ???? ???? ???? ???? ??? ??? ??? ??? ???? ??? ?? ???? ????? ???? ????? ??? ????? ????? ???? ?? ??? (??? HDPE ???) ?????? ??????? ???? ??? ?????? ??? ??? ??? ???? ??? ????? ?? ???? ?????? ?? ??? ??? ??? ????? (?????, ??) ???? ?????? ?? ???? ???? ??? ??? Micro-tunneling ???? ??? ?????? ??????
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