Steam is low -heat -loss direct -burried insulation construction for long range transport

The utility model discloses a steam is low -heat -loss direct -burried insulation construction for long range transport comprises work steel pipe, aerogel heat preservation, fibre aluminium foil reflection stratum, superfine glass wool insulation layer, air bed, steel jacketPipe, rigid polyurethane foam heat preservation and high density polyethylene outer tube outside to interior in proper order. The utility model discloses a less aerogel and the rigid polyurethane foam heat preservation of coefficient of heat conductivity can reduce the insulation layer thickness effectively to reduce the steel jacketPipe size, reduce project cost, adopt the structural style of rigid polyurethane foam heat preservation and high density polyethylene outer tube outside steel jacketPipe, when the high density polyethylene outer tube was destroyed, soil and water also can be kept apart to the rigid polyurethane foam heat preservation, and protection steel jacketPipe does not receive corruption, extension directly -buried steam