隧道二衬拱顶施工质量问题及预控对策

Quality problems and pre control measures of tunnel secondary lining vault construction

由于受隧道作业条件及作业环境等影响,较之于露天式混凝土作业,隧道内二衬防水混凝土作业的难度系数较高,会由于拱顶混凝土浇筑不密实、二衬及初支间出现空洞而造成后期注浆工作量增大,灌注过于饱和导致端头模板跑模涨模,严重的造成二衬台车整体移位、整板二衬报废甚至二衬台车受损。为了进一步提升二衬混凝土的施工水平及质量,本文结合长期隧道施工经验,阐述隧道二衬拱顶施工质量问题,并提出针对性的预控对策。

Due to the influence of tunnel operation conditions and operation environment,compared with open-air concrete operation,the difficulty coefficient of secondary lining waterproof concrete operation in the tunnel is higher,which will increase the later grouting workload due to the non-dense pouring of vault concrete and the cavity between secondary lining and initial support,and lead to the formwork running and expansion of end formwork due to over saturation of grouting.It will seriously cause the overall displacement of the secondary lining trolley,the scrapping of the whole plate secondary lining and even the damage of the secondary lining trolley.In order to further improve the construction level and quality of secondary lining concrete,combined with long-term tunnel construction experience,this paper expounds the construction quality problems of tunnel secondary lining vault,and puts forward targeted pre control countermeasures.