13.Nguyen ly cau tao mong cung.Ve minh hoa cac loai mong cung.

a.)Mong gach

De phu hop voi kich thuoc vien gach 5,5x10,5x22.Mach vua thuong dung la 1,5cm.Lay do cao cua mong giat cap:7x14x7x14 ; 21x14x7x14;14x14x14x14.

Khi lam viec 0 chiu uon ma chi chiu nen,thuong ap dung cho nha thap tang

Mong gach ,vat lieu mac >=75,mac vua xay >=50.Quy cach:chieu rong mong < 1,5m.Xay giat bac,goc anpha = 26'30''.Chieu rong goi mong:220,330,450,690.Cao do day mong : 7x14x7x14 ; 14x14x14x14.Doi voi mong lech tam,o khe lun,bac mong nen rong =1/2 chieu dai vien gach.

b.)Mong da hoc

Vat lieu: Da hoc,cuong do200kg/cm2,chat ket dinh vua tam hop 1.1.5.Quy cach:chieu rong cua goi mong >0,5m.Mong giat bac,chieu cao moi bac <0,5m,do do moi vien da o duoc >1/3 chieu rong goi mong..Ap dung cho cac vung pho bien co nhieu da,thap tang,tai trong lon.

c.)Mong be tong

Vl chinh la cat da soi.ket dinh = xi mang.Quy cach:goc cung anpha<45',hinh dang mong phu thuoc vao chieu cao cua cac goi mong.Co cac hinh dang nhu sau:HCN (khi mong <350,giat bac khi chieu cao goi mong >350,<1m),Hinh thang(h goi > 1m).