(1) The qualified pipes and fittings shall be selected according to the measured sample drawing for piping and pipe cutting. After the prefabricated pipe section is prepared, the size between nodes and the orientation of pipe fitting interface shall be checked according to the small sample drawing;
(2) The form of support and fixed support shall be selected for the drainage pipe according to the specification, and the specification and quantity of support shall be determined;
(3) According to the design position of pipeline system and sanitary equipment, combined with the size of equipment drainage outlet and the construction requirements of drainage pipe orifice, cooperate with the construction of civil structure, and reserve pipe orifices or pipe fittings on walls, beams and floors;
(4) Check the position and size of each reserved hole of the drainage pipe and connect it;
(5) Measure according to the direction of the pipeline and the centerline mark of each pipe section, draw the measured sample drawing, and indicate the size in detail;
(6) After the civil wall is painted, the materials and prefabricated pipe sections can be transported to the installation site, and the pipes and expansion joints can be installed successively according to the reserved pipe orifice position and pipe centerline, and each pipe orifice can be connected.
