三维渐变大断面洞室混凝土衬砌施工技术探讨

Discussion on concrete lining construction technology of large cavern with gradual cross-section

拉西瓦水电站地下厂房尾水扩散段为三维渐变结构,洞室断面大,曲面变化复杂,模板设计及配置技术含量高,混凝土衬砌施工难度大。以该水电站尾水扩散段混凝土衬砌施工为例,对施工程序、模板配置、排架搭设和混凝土衬砌等施工技术作了简要介绍,同时通过取芯检验显示,混凝土内部结构强度符合要求。相关成果可为以后同类工程施工提供经验借鉴。

The expanding section of tailrace tunnel of underground powerhouse in Laxiwa Hydropower Station is a 3D structure with gradually changed cross - section, and the cavern section is large with complicated curved surface, resulting in high techni- cal requirement for formwork design and planning, as well as difficult construction of concrete lining. In view of the concrete lin- ing construction of the expanding section, this paper briefly introduces some construction technologies such as construction proce- dure, formwork planning, bent erection and concrete lining, and the coring test result reveals that the internal structural strength of concrete can meet the relevant requirements. The research achievements can provide reference for similar projects.