1. The traditional construction technology of rock wool insulation in brick warm trench is as follows: digging trench 2 x 2 (m) to lay concrete cushion, laying angle steel bracket of heating pipe, removing rust from steel pipe, painting and anticorrosion, processing and fixing clip, welding of steel pipe, steel pipe fixing, water pressure test, rock wool insulation, wrapping glass cloth, brushing asphalt paint, covering plate of trench, backfilling soil.
Among them are the transportation and dumping of digging trenches for soil, the purchase and transportation of sand, cement, bricks, angle steel, rock wool, trench cover, etc. The construction touches a large area with many intermediate links, occupies a large construction site and has a long construction period, and the loss rate of rock wool in the construction and transportation process is more than 10%. Because rock wool fibers have intense irritation to human skin and respiratory tract, it is necessary to take necessary labor maintenance measures.
2. Construction technology of polyurethane direct buried insulation pipe: steel tube pressure test rust removal rigid polyurethane direct buried pipe manufacturing (above work stopped in the factory) digging trench welding of direct buried pipe water pressure test foaming backfill soil.
The manufacture and construction of polyurethane direct-buried insulating pipe can stop in parallel, and digging ditches in the construction site is consumed by the manufacturer, and welding can stop directly after transportation. The construction time is greatly shortened.
This method not only shortens the construction time, but also saves a lot of manpower and material resources. Moreover, the polyurethane direct-buried insulating pipe has no loss in transportation because of its good external corrosion resistance. Therefore, the direct buried polyurethane pipe has been welcomed by people in the pipeline transportation industry.
