南京三桥清水混凝土施工组织浅谈

Management of as-cast finish concrete construction for the 3^(rd) Nanjing Yangtze River Bridge

清水混凝土施工技术是涉及混凝土施工全过程质量控制的综合技术,是混凝土施工的发展方向。南京三桥指挥部在建设过程中提出了清水混凝土的质量目标,进行了大量的配合比试验和试验墩施工。在施工过程中,对原材料、模板、混凝土浇筑、养护全过程进行了严格的控制,并提出了“首件工程认可制,”以确保清水混凝土的施工质量。对于不同的结构和施工工法,建设者因地制宜,实行了不同的施工和控制方法,在上部和下部结构施工中,在竹胶板和钢模板上,清水混凝土的质量目标都基本实现,达到了建设伊始提出的清水混凝土质量目标。本文结合南京三桥混凝土工程的施工,对南京三桥清水混凝土施工组织、科研等方面作了介绍,对实现“清水混凝土”这个目标的关键工序作了较详细的说明,并介绍了在南京三桥施工中取得较好效果的施工工艺和方法,可供以后的工程参考。

The technology of as-cast finish concrete is a synthesized control procedure, a trending direction for construction of concrete buildings. The objective of as-cast finish concrete is brought forward by the commanding department for the 3rd Nanjing Yangtze River Bridge. A good many of concrete fix proportions are experimented and trial piers constructed. The entire procedure of concrete construction, from selecting the raw materials and the molding boards to choosing the procedure of concrete casting and maintenance are strictly controlled to ensure the quality of the concrete. For different parts of the structures, different construction methods are employed. The objective of ascast finish concrete is realized in the construction of both the superstructures and the substructures. This paper introduces the construction management procedures and the key techniques employed for different parts of the bridge.