- DiL tra cap nhat cac DDK da xay clung giao cheo va di gan trong ph4m vi each vi tri tuyen DDK du kiL xay clung 20m.
4. Khao sat dia chAt lap NCKT DDK 0,4kV = 35k
a) Thu thap phan tich, he tho'ng hoa cac tai lieu da c6
- Ti6n hanh thu thap cac tai lieu khdo sat da c6 do cac nganh, cac dia phuang va giai• loan nghien ciru truac day thuc trong pham vi 0,3 km cach tim cong trinh ve:
+ Dia cha't khu vu.c.
+ Cac tai lieu khao sat dia chAt cong trinh cho xay cluing cong trinh dan dung — cong nghiep, cong trinh giao thong, din
- Tren co. s6( cac tai lieu thu thap duck, phan tich, tong hgp, he th/(Sng hoa c16 danh gia khai quat v'e diL kin DCCT tuy6n DDK;
b) Tham do DCCT
- Doi vori DDK 22kV ±35kV: Cac ho khoan/dao tham do bo tri doc theo tim tuye'n, trung binh 4 km c6 1 ho khoanklao tham do voi chi&i sau trung binh 3+6m. Cac ho khoan, ciao tru tien bo tri trung vao vi tri cot, gOc neo. Trong truong hop can khoan nhieu horn thi phai luan chimg rO trong Nhi4n vu khao sat.
- Doi vori DDK 22kV nam trong khu vkrc dia ban thi tr'An, thi xd,, thanh ph& co the sir dung cac so dia chat cong trinh cong trinh c6 gan nhat de 10 NCKT ma khOng can khoan tham do dia chat
- Doi voi DDK 0,4kV (khong ke cac khoang vugt lern): sir dung cac s'6 lieu dia chat cong trinh cua cong trinh hie gan nhat de lap NCKT ma khong can khoan tham do.
- Tai vi tri cot vuot song lon, m8i vi tri cot vuot khoan 1 116, chiL sau trung binh 6+10m. N6u can thiet c6 the khoan sau horn nhung phai 1u4n chimg trong NhiOn vu Udn sat.
c) Lay mau va thi nghi01
- La'y mau theo tirng lopda't da trong to khoan. Mau thi nghiOn trong pheng, trung binh moi loci dat lay 02 mau dat nguyen dang.
- L'Ay mau nu& trong he) khoan gap nuac ngAm. Chi'eu dai tuy'en DDK duo i 10 km, lay 2 mau, chi'eu dai tuy'en DDK tren 10km, lay 3+5 mau.
- Quy cach mau &At cid, mau noon lay va bao quan theo cac Quy dinh hien hanh. - Cac chi tieu thi nghiOn phan tich theo yeu c'au cua CNDA va CNKS.
d) Do diOitro. suAt ddt nen
- Dien troy suk cua dkn'en cho phep lay theo die -1 tra sudt cua cac \Tung c6 diL kien dia chat Wang to hoc tien hanh do di0-itro. suat cua dat nen tuyen DDK. SO lugng
trung binh 2+3 km b6 tri 01 vi tri do, uu tien 136 tri vao cac vi tri cot tram bin dp, lap thiet bi &mg cat, thiet bi bao ve, do luting
e) Lap bao cao khdo sat dia chdt
- K6t qua khao sat dia chAt cong trinh thuyect minh, cac phu luc, ban ve, ban tinh, ket qua phan tich thi nghi*n va cac tai WO lien quan.