The prefabricated direct-buried thermal insulation pipe fittings are based on the outer casing steel pipe. The three-piece clamping plate is used to limit the position of the core pipe (three-dimensional) and prevent the surface of the outer casing from overheating due to the thermal bridge effect. The technique of thermal break bridge is used in the structure. Achieved heat transfer without heat transfer. After ten years of engineering practice testing, the performance is absolutely reliable.
Our company's prefabricated direct buried fixed joints have fixed installation methods, as follows:
Prefabricated directly buried fixed joints are welded along with the pipeline at the position required by the design, like other insulation pipe fittings. The relative position of the thrust plate for return water is placed according to the requirements of the following chart. The welding inspection of the pipeline is qualified, and the insulation pipe joint is insulated.
According to the size of the chart, the supporting pouring formwork, the cement number and the specifications of the steel bars are in accordance with the design requirements, the steel bars are tied, and the concrete is poured.
After the concrete strength meets the design requirements, backfill compaction shall be performed in accordance with the requirements for backfill soil.
If the pipeline has a compensation design, the hydraulic test must be carried out only after the concrete strength reaches the design requirements and the pipe trenches on both sides of the fixed pier are tamped and filled.