6月14日,红石堰塞湖治理工程溢洪洞出口挑流鼻坎开始混凝土浇筑。溢洪洞布置于牛栏江右岸,由引渠段、闸室段、无压洞段及出口挑流鼻坎组成,全长约1280m。出口挑流鼻坎桩号为溢1+196.042~溢1+241.411m,鼻坎采用舌形鼻坎,反弧半径R=60m,挑流鼻坎段长45.369m,最大高差19.69lm,设计浇筑混凝土量为8000m~3。挑流鼻坎混凝土浇筑采用分层分块的形式,主要分为基础 June 14, Hongshi dam lake governance spillway exit of the project to pick the nose began to pour concrete pouring. The spillway tunnel is arranged on the right bank of Niulan River and consists of a drainage channel, a gate compartment, a non-pressured hole segment and an exit pick-nose ridge. The total length is about 1280m. Exit nose nose ridge stake stranded 1 +196.042 ~ overflow 1 +241.411 m, nose ridge with tongue ridge, reverse arc radius R = 60m, nose dive section 45.369m, the maximum height of 19.69lm, design Pouring the amount of concrete is 8000m ~ 3. Pick the nose ridge concrete pouring layered sub-block form, mainly divided into the foundation