供热管道直埋敷设保温材料的选用（１５０９１３）黑龙江省清河林业局明照日供热管道采用直埋敷设，是目前最经济的一种敷设方式。与地沟敷设相比，能减少土方量，节约建筑材料和工时，使工程总投资比地沟敷设降低２０～５０％，便于机械化施工，施工周期缩短一半以上，而... The selection of thermal insulation materials for direct burial of heating pipes (150913) The Mingzhao day heating pipeline of Qinghe Forestry Bureau of Heilongjiang Province is buried directly and is currently the most economical laying method. Compared with the laying of trenches, it can reduce the amount of earthwork, save construction materials and man-hours, and reduce the total investment of the project by 20 to 50% compared with the laying of trenches, which facilitates mechanized construction and shortens the construction period by more than half, and...