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无粘结预应力这项新工艺由于不需要埋管穿筋(在2跨以上的多跨梁中更显其优越)和孔道二次灌浆等工序,从而施工方便,加快进度,受到设计与施工单位的欢迎。无粘结预应力筋束的制作方法很多,如沥青、无规物和柴油作涂料的涂包法(建研院在1979年无锡国棉一厂纺纱乍间工程中首次采用)、内涂专用油脂外包挤压聚乙烯套管的挤压涂层法(北京建筑工程研究所研制)等。由于后者机
The new process of non-cohesive prestressing is due to the fact that there is no need to insert pipe ribs (more superior in more than 2 spans of multi-span girders) and the secondary grouting of the hole, etc., and thus the construction is convenient, the progress is accelerated, and the design and construction are accelerated. The unit’s welcome. There are many methods for producing unbonded prestressed tendons, such as coating methods for asphalt, atactic materials, and diesel oil (For the first time in the 1979 Wuxi Guomian 1st mill spinning plant project), internal coating Extruded coating method for special oil and grease extrusion extrusion polyethylene casing (developed by Beijing Institute of Architectural Engineering). Since the latter machine