Remedial Measures for Drainage Works of Ductile Iron Pipes
1. Drainage pipe fittings are not flowing downstream. No downstream fittings are used at the elbow and tee, which increases the water flow resistance. Or the water from the two outlets of the drainage horizontal pipe flows in opposite directions to the tee between the two outlets and is discharged from the side socket of the tee. The disadvantage is not only that the water flow is not smooth, but the slope of the pipe section is unreasonable and easily blocked. It is advisable to change this “head T” approach to elbow plus water tees (whether it is changed to Y tee or TY tee) and stagger to avoid that the drainage of different directions meets orthogonally on the plane. 2. There is no gap in the flexible connection of cast iron pipe joints. The process stipulates that there should be a gap of about 10mm between the sockets to facilitate expansion and contraction. In the operation, this point is often ignored and the sockets are pressed to death. Marks should be made in adv...