盾构联络通道冷冻法施工中混凝土的质量控制

Quality control of concrete in the construction of freezing method of shield contact channel

为确保在负温环境下盾构联络通道衬砌混凝土不被冻伤,本文以杭州地铁3号线良高区间联络通道为例,通过对混凝土材料改良、增加施工养护控制等措施,来提高衬砌混凝土的早期强度。实践表明:在负温环境下改善混凝土配合比和养护条件,可在不解冻土体的条件下尽快提高混凝土强度,缩短冻结时间,提高联络通道混凝土的施工质量。本研究为类似环境下混凝土浇筑提供一定的参考价值。

In order to ensure that the lining concrete of shield contact channel is not frostbite under negative temperature environment,this paper takes the Lianggao section of Hangzhou metro line 3 as an example to enhance the early strength of lining concrete by improving concrete materials and increasing construction maintenance control.The practice shows that improving the mixture ratio and curing condition of concrete in negative temperature environment can improve the concrete strength as soon as possible without thawing soil,shorten the freezing time and improve the construction quality of contact channel concrete.This study can provide some reference value for concrete pouring in similar environment.