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, burying angle steel bracket of heating pipe, removing rust of steel pipe, painting and anticorrosion, processing and fixing clamp, welding of steel pipe, fixing of steel pipe, 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.

直埋供熱管道保溫不需求砌筑龐大的地溝，只需將保溫管埋人公開，因而大大減少了工程占地，減少土方開挖量約50%以上，減少土建砌筑和混凝土量90%。同時，保溫管加工和現(xiàn)場挖溝平行停止，只需現(xiàn)場接頭，能夠縮短工期約50%以上。

Directly buried heat-supply pipelines do not need to build huge trenches for thermal insulation. They need only be buried in public, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. At the same time, the processing of insulating pipes and digging ditches on site are stopped in parallel, and the construction period can be shortened by more than 50% with only on-site joints.

比其他過去常用的管道保溫資料低得多，保溫效果進步4~9倍。再有其吸水率很低，加上保溫層和外面防水性能好的高密度聚乙烯或玻璃鋼維護殼，改動了傳統(tǒng)地溝敷設(shè)供熱管道"穿濕棉襖"的情況，大大減少了供熱管道的整體熱損耗，熱網(wǎng)熱損失為2%，小于10%的規(guī)范請求。

Compared with other commonly used pipeline heat preservation data, the heat preservation effect is improved by 4 to 9 times. With its low water absorption, high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproof performance, the situation of traditional trench laying heating pipeline "wearing wet cotton jacket" has been changed, and the overall heat loss of heating pipeline has been greatly reduced. The heat loss of heating network is 2%, which is less than 10% of the international standard requirements.

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购附印４蟠罂s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 insulation pipe has no loss in transportation because of its good external corrosion resistance. Therefore, polyurethane direct buried pipe in the pipeline transport industry has been welcomed by people.

總之，高溫預(yù)制直埋保溫管不只具有傳統(tǒng)地溝和架空敷設(shè)管道難以比較的技術(shù)、適用性能，而且還具有顯著的社會效益和經(jīng)濟效益，也是供熱的有力措施。

In a word, the high temperature prefabricated directly buried insulation pipe not only has the advanced technology and applicability which is difficult to compare with the traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits, and is also a powerful measure of heating and energy saving.