The construction of cement mortar fabrics should usually be carried out after the spiral tube is laid, the test pressure is passed, and the soil is cleaned according to the planning request. During the construction of the fabric, the pipeline is necessary to be in a stable situation. If the tube of the corrosion layer of the fabric first is first tube, the steel pipe wall is thin and small, and the anti -corrosion layer is damaged during construction, transportation, and soil.
Before the fabric construction, it is necessary to clean the inner wall of the tube to remove the soft oxide skin, rust, soil, oil, and welded slag; Vertical deformation shall not be greater than the planning rules, and not greater than 2%of the inner diameter of the pipeline.
