隧道衬砌脱空及厚度不足的原因分析与防治措施初探

Discussion on Causes of and Preventive Measures against Tunnel Lining Voids and Inadequate Thickness

隧道衬砌脱空及厚度不足是隧道施工及运营过程中常见的质量缺陷,存在极大的质量安全隐患。基于此,文章从隧道开挖、初期支护、防水板施工、模板安装、混凝土浇筑及养护质量等方面进行了分析和总结。结果表明,影响隧道二次衬砌脱空的因素涉及隧道施工的各个环节,必须从各环节加以严格管控;带模注浆、及时进行第三方检测以及改进衬砌混凝土施工工艺和研究开发新材料新设备对防治隧道衬砌脱空及厚度不足具有明显的效果。

It is common to have the problems of voids behind tunnel lining and inadequate lining thickness during tunnel construction and operation,and there are some hidden dangers in safety.Analysis and summarization were conducted in terms of tunnel excavation,primary support,construction of waterproof board,formwork installation,concrete pouring and curing quality,with the results showing that the factors affecting voids behind secondary lining are related to various links of tunnel construction and strict management and control should be carried out in each link;it has significant effect to prevent tunnel lining void and inadequate thickness to grout with formwork,conduct third-party test and improve construction technology of lining concrete and develop new material and equipment.