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.

其中還有挖溝取土的運輸與傾卸置放，砂 石 、 水泥 、 磚塊 、 角鋼 、 巖棉 、 溝蓋板等的采購和 運輸 。 施工觸及面大，中間環(huán)節(jié)多；占領(lǐng)施工場 地大，施工工期長，而且?guī)r棉在施工和運輸過程 中損耗率達10%以上 。由于巖棉纖維對人體皮 膚和呼吸道有激烈的刺激性，必需采取必要的勞動維護措施 。

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、聚氨酯直埋保溫管的施工工藝：鋼管試壓 → 除銹 → 硬質(zhì)聚氨酯直埋管制造（以上工作在工廠停止） → 現(xiàn)場挖溝 → 直埋管焊 接 → 水壓實驗 → 現(xiàn)場發(fā)泡 → 回填土。

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.

聚氨酯直埋保溫管的制造和施工完整能夠平行停止，能夠在施工現(xiàn)場挖溝是在廠家消費，運輸?shù)胶笾苯油Ｖ购附?。大大縮短了施工時間。

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.

這種辦法在縮短施工時間的同時，還省去大量的人力物力，而且聚氨酯直埋保溫管由于其外抗腐蝕層的良好特性，在運輸中過程中根本沒有損失。所以聚氨酯直埋管在管道運輸行業(yè)遭到了人們的歡送。

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.