1、降低工程造價(jià)。
1. Reduce the cost of construction.
據(jù)有關(guān)部門(mén)測(cè)算，雙管制供熱管道，普通狀況下能夠降低工程造價(jià)的25%（采用玻璃鋼做維護(hù)層）和10%（采用高密度聚乙烯做維護(hù)層）左右。
According to the calculation of relevant departments, double-pipe heating pipeline can reduce the cost of construction by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions.
2 熱損耗低，節(jié)約能源。
2. Low heat loss and energy saving.
直埋式保溫管其導(dǎo)熱系數(shù)為：λ=0．013—0．03kcal/m·h·oC，比其他過(guò)去常用的管道保溫資料低得多，保溫效果進(jìn)步4~9倍。再有其吸水率很低，約為0．2kg/m2。吸水率低的緣由是由于聚氨酯泡沫的閉孔率高達(dá)92%左右。低導(dǎo)熱系數(shù)和低吸水率，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(hù)殼，改動(dòng)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(qǐng)求。
The thermal conductivity of directly buried heat preservation pipes is 0.013-0.03kcal/m.h.oC, which is much lower than other commonly used heat preservation data in the past, and the heat preservation effect is improved by 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The reason for low water absorption is that the polyurethane foam has a closed porosity of about 92%. Low thermal conductivity and low water absorption, together with high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproofing performance, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirements of 10%.
3、防腐，絕緣性能好，運(yùn)用壽命長(zhǎng)。
3. Anti-corrosion, good insulation performance and long service life.
直埋式保溫管由于聚氨酯硬質(zhì)泡沫保溫層嚴(yán)密地粘結(jié)在鋼管外皮，隔絕了空氣和水的滲入，能起到良好的防腐作用。同時(shí)它的發(fā)泡孔都是閉合的，吸水性很小。高密度聚乙烯外殼、玻璃鋼外殼均具有良好的防腐、絕緣和機(jī)械性能。因而，工作鋼管外皮很難遭到外界空氣和水的腐蝕。只需管道內(nèi)部水質(zhì)處置好，據(jù)國(guó)外材料引見(jiàn)，直埋式保溫管的運(yùn)用壽命可達(dá)50年以上，比傳統(tǒng)的地溝敷設(shè)、架空敷設(shè)運(yùn)用壽命高3~4倍。
The directly buried insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can isolate the infiltration of air and water, and can play a good anti-corrosive effect. At the same time, its foaming holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the outside air and water. According to foreign materials, the service life of directly buried insulation pipe can reach 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.
4．占地少，施工快，有利環(huán)境維護(hù)和減少施工擾民。
4. It occupies less land, constructs quickly, maintains favorable environment and reduces construction disturbance to the people.
直埋供熱管道不需求砌筑龐大的地溝，只需將保溫管埋人公開(kāi)，因而大大減少了工程占地，減少土方開(kāi)挖量約50%以上，減少土建砌筑和混凝土量90%。同時(shí)，保溫管加工和現(xiàn)場(chǎng)挖溝平行停止，只需現(xiàn)場(chǎng)接頭，能夠大幅度縮短工期。由于減少了磚、水泥、砂石、余土等的運(yùn)輸，從而減少了施工過(guò)程中汽車(chē)尾氣排放量、揚(yáng)塵量、噪聲排放量，從而維護(hù)了環(huán)境。
Directly buried heating pipelines do not need to build huge trenches. They only need to bury insulating pipes openly, 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, only the on-site joints are needed, which can greatly shorten the construction period. Because the transportation of bricks, cement, sand and gravel, residual soil, etc. is reduced, the emission of automobile exhaust, dust and noise in the construction process are reduced, thus the environment is maintained.
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