Ðề:nhung vuong mac trong qua trinh thi cong

sao minh dang mai ma chang danh duoc tieng viet the nhi?xin loi moi nguoi nha!neu kho doc mot chut thi thong cam cho minh nhe!(ko hieu sao ma hom nay tu dung ko go duoc tieng viet nua)
Minh co mot so thac mac ve van de thi cong mong duoc co su giai dap.Minh dang rat bo ngo ve van de nay va rat can duoc su chi giao cua nhung nguoi di truoc.
1/Khi xay nha cao tang lam the nao de xac dinh duoc tam cua cot tang mot va tang tren cung la dong tam hay ko?vi du nhu la ta dang xay nha o trung tam ha noi chang han
2/De kiem tra cao trinh cua san ta vua thi cong hay lap van khuon xong muon kiem tra xem no co ngang bang khong?ngoai cach dung nivo thi con cach nao khac khong?
3/Khi uon cot thep thi ta biet rang cot thep se gian ra mot doan.Nhung minh khong biet voi mot goc uon bat ki thi se gian ra mot goc tuong ung la bao nhieu de co the cat thep hop li khi dua vao uon,cat roi dat vao be tong cho dung voi tinh toan
4/Trong cach dat cot thep co the thay vi du nhu 3 phi 6 bang 1 phi 18 duoc khong?tai sao lai ko thay duoc?
Rat mong cac vi tien boi di truoc chi dan cho!