pph duct laying

When laying, it should make full use of its superior flexibility, connect it on the ground, and then put it directly into the groove with a soft belt sling. Because the linear expansion coefficient of the PE pipe material itself is large, the length of the pipe will change greatly under the influence of the ground temperature, so the buried pipeline below dn110 should be laid in a curved shape to offset the influence of thermal expansion and contraction, but the pipeline above dn110 should be laid in a curved shape. The pipeline has sufficient soil resistance to offset the temperature change stress, and can be laid directly without reserve pipe length. When using the flexible natural bending of the pipe to change the direction, the bending radius of the pph pipe can be as small as 25 times the pipe diameter. For pipelines crossing railways, highways, rivers, and major urban roads, strength tests and tightness tests should be carried out on the connected pipelines before crossing construction.