Installation of indoor drainage pipes:

The general construction sequence for installing cast iron drainage pipes inside buildings is to first install underground pipelines (i.e. discharge pipes), and then install vertical or horizontal branch pipes. Cast iron drainage pipes (buried underground) generally use socket connections.

The installation and laying principle of drainage pipes: underground first, then above ground; First the large tube, then the small tube; Supervise first, then branch.

Installation preparation pipeline prefabrication

(According to the construction drawings and technical briefing, check and verify whether the reserved hole positions and sizes are correct, and mark the pipeline coordinates and elevation positions for positioning.)

Installation of discharge pipe

(1) The burial depth of the discharge pipe depends on the elevation of the outdoor drainage pipeline and meets the design requirements. The discharge pipe is generally connected to the outdoor drainage pipeline at the top of the pipe, and its water flow angle is not less than 90 °; If a discharge pipe drop connection is used and the drop height is greater than 0.3m, the water flow angle is not limited. When burying outdoors, it is necessary to ensure that the pipeline has sufficient cover depth to meet the requirements of anti freezing and anti pressure.

(2) To install brackets and lift discharge pipes, a frame should be erected first. The brackets should be planted according to the design slope or hang clamps, and the size of the suspension rod should be measured to firmly support and lift the prefabricated pipes. The spacing between the horizontal pipe supports should not exceed 2m.

(3) If the discharge pipe is suspended or suspended inside the ceiling, a closed water test must be conducted before the ceiling, and the concealed inspection procedures must be handled according to the concealed engineering project.