防渗墙下帷幕灌浆施工

Construction of curtain grouting under cut-off wall

高喷防渗墙应用于大型水利工程永久防渗在国内还比较少,在墙下进行帷幕灌浆施工为数更不多。本次施工的墙下帷幕是土坝方案优化的重要组成部分,其顺利实现为总体的优化方案奠定基础。本文通过介绍大顶子B标段旋喷防渗墙下帷幕灌浆施工的成功经验,特别是在薄墙下控制孔底偏差、保证施工质量的方法,值得同行在以后的设计、施工中借鉴。

Application of high pressure grouting cut-off wall on the large dams is less in China, while curtain grouting under the wall is far less. Curtain grouting under the wall is the main portion of optimization for the earth dam plan, which makes the foundation for the general optimization plan implement smoothly. The successful experience of curtain grouting construction under impervious wall by spiral spray in bid section B of Dadingzi, especially methods of controlling the deviation of bottom outlet under the thin wall and ensuring the construction quality, is introduced in the paper. It’s worth learning for the peer in design and construction.