摘要
三峡工程电源电站施工围堰防渗采取振孔高喷防渗墙形式。振孔高压喷射注浆是钻喷一体化的高喷灌浆技术,以大功率的振动锤将带有特制喷嘴的高喷杆快速向下振孔,同时用高压设备使浆液、水、气成为高压流从喷嘴中喷射出来,冲击、扰动土体。当钻杆到达预定岩面后,以一定速度向上提升钻杆,使浆液与土体强制混合,待浆液凝固后便形成防渗墙。检测表明,三峡工程电源电站施工围堰高喷防渗墙施工质量优良,各项性能均满足设计要求。
The vibrating-hole jet grouted cut-off wall has been applied to the construction cofferdam for the power resource station at the Three Gorges Project （TGP）. The vibrating-hole jet grouting is a kind of jet grout technology with integrity of drilling and shotconcreting. While the jetting bar with special nozzle lowers down rapidly by powerful vibrating hammer, the high pressure device makes grout, water and air become a high pressure flow and jet out from the nozzle, which strongly impacts and destroys soil body. When drill bar reaches down to the presumptive rock surface, it will be lifted up at certain speed to make grout be mixed with weathered sand forcedly; when grout consolidates, a wall has been formed. It has been based on inspection that the construction quality of the vibrating-hole jet grouted cut-off wall in the construction cofferdam at TGP is excellent and all its performance indexes can meet the design requirements.
出处
《水力发电》
北大核心
2005年第8期42-43,63,共3页
Water Power
