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结合长江重要堤防同马大堤加固工程I、II标段垂直防渗墙施工实践 ,论述了射水法、锯槽法施工工艺及其特点。射水法成墙施工工艺简单 ,对各种地层的适应能力强 ,机具经改进后 ,可穿透卵石层、块石等障碍物 ,成墙最大深度可达 2 8.5m ,但槽孔的垂直度要求高 ,槽孔的倾斜度控制是质量控制的重点和难点。锯槽法成墙施工工艺相对复杂 ,对地层也有一定要求 ,但成墙具有连续性 ,成墙质量易于保证 ,质量控制的重点是土工布隔离体及槽内混凝土的浇筑质量。施工完成后 ,通过开挖探坑、取芯等检查 ,防渗墙接头、墙体质量均符合要求
Combined with the construction practice of the vertical cutoff walls of I and II sections in the reinforcement project of the main dam of the Yangtze River, the construction technology and characteristics of the water jetting method and the sawing method are discussed. Water jet method into the wall construction process is simple, adaptable to a variety of formations, the machine has been improved, can penetrate the pebble layer, stone and other obstacles, the maximum depth of the wall up to 2 8.5m, but the verticality of the slot High requirements, the inclination of the slot control is the focus and difficulty of quality control. However, the formation of the wall is continuous, and the quality of the wall is easy to guarantee. The quality control focuses on the quality of the geotextile and the pouring of concrete in the slot. After the completion of construction, through excavation exploration pit, coring and other inspection, impervious wall joints, wall quality are in line with the requirements