锦屏二级水电站围堰塑性混凝土防渗墙施工与质量控制

Construction and Quality Control for Plastic Concrete Diaphragm Wall in Cofferdam of Jinping Ⅱ Hydropower Station

塑性混凝土防渗墙具有抗压强度低,弹性模量小,极限应变大的特点,在荷载作用下墙内应力和应变均很低,不仅能够适应外力作用下抗拉和抗剪应力带来的墙体变形,具有良好的力学性能,而且水泥用量小,具有较好的技术经济指标。因此,塑性混凝土防渗墙在国内外水利水电围堰工程中得到广泛应用。通过塑性混凝土防渗墙技术在雅砻江锦屏二级水电站拦河闸坝围堰工程中的应用,介绍了"钻劈法"成槽工艺、施工技术要点及混凝土质量控制重点。

Plastic concrete diaphragm wall is characterized with low compressive strength,low elastic modulus and high ultimate strain.Stress and strain in the wall is very small under load and the wall deformation will be consistent with tensile stress and shear stress under any outside forces and the wall has good mechanical properties with small cement content and better technical and economical indicators.Therefore,plastic concrete diaphragm wall are widely used in cofferdam of water resources and hydropower projects both in China and abroad.In this paper,slot formation technique by drilling and splitting method,key construction technical points and concrete quality control are presented based on application of plastic concrete diaphragm wall technology in cofferdam for gated dam of Jinping Ⅱ hydropower station on Yalong River.