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城市和居民区的供热热力网,除个别地区外,一般都采用地沟敷设,这样做,既不影响城市环境美化,又不影响市区交通安全。虽然建设通行地沟和半通行地沟检修和维修方便,但是却大大地增加了基建投资和施工周期,因此绝大多数热力网设计都采用不通行地沟。随着世界发达国家集中供热的高度发展,热力网地沟敷设,费用较高(约占热力管网总投资的30—50％),占地面积大,施工周期长的缺点越来愈突出。因此丹麦、瑞
In addition to individual areas, heating heating networks in cities and residential areas are generally laid in trenches. In so doing, they will not affect urban landscaping, nor will they affect urban traffic safety. Although it is convenient to build maintenance trenches and semi-circumferential trenches for maintenance and repair, it has greatly increased the capital investment and construction period. Therefore, most thermal network designs use unprotected trenches. With the development of centralized heating in developed countries in the world, the laying of thermal network trenches has a relatively high cost (accounting for 30-50% of the total investment in thermal power network), and the shortcomings of large construction area and long construction period become more and more prominent. So Denmark, Switzerland