以北横通道隆昌路下立交为例探索地道明挖结构免装饰混凝土的应用

Taking Longchang Rd.Overpass of Beiheng Passage as an Example to Explore the Application of Non-Decorative Concrete in Open-Cut Tunnel Structure

清水混凝土直接采用混凝土机理作为永久饰面,代表混凝土施工工艺的最高水平。其具有不需装饰,省去涂料、饰面等特点;一次成型、不剔凿修补,但对混凝土浇筑工艺要求非常高。为提高混凝土浇筑工艺,达到隧道符合绿色、环保的要求,在上海市北横通道隆昌路下立交中进行明挖结构免装饰混凝土工艺试点。通过对混凝土浇筑过程中的模板、裂缝控制和色差等细节均进行改进提高,取得一定效果。

Fair-faced concrete directly adopts the concrete mechanism as the permanent facing,which represents the highest level of concrete construction technology.It has the characteristics of no-needing decoration,eliminating the need for coatings and finishes;one-time molding and nochisel repair,but the requirements for concrete pouring process are very high.To improve the concrete pouring process&meet the requirements of green&environmental protection for the tunnel,a pilot project of open-cut structure decorationfree concrete technology is carried out in the interchange under Longchang Rd.of Beiheng Passage,Shanghai.By improving the details of the formwork,crack control&color difference in the concrete pouring process,certain effects have been achieved.