大直径(直径168～600mm)工程孔,不仅需要良好的止水效果,而且还需要对钻孔的套管进行有效固定。基于直接通过套管加压注灰技术的分析,开发研制成功了钻孔固管止水注灰器。该钻孔固管止水注灰器利用弹簧的无压释放特性,在注浆泵的作用下将上部水泥浆液压入钻杆,使之流入接头的注灰通道内,水泥浆液顶开锥形顶,弹簧被压缩;而当注浆泵不再工作、无压力作用时,锥形顶在弹簧的反作用下顶住灰浆通道,靠锥形顶的锥面封严灰浆通道,使灰浆不会反流到钻杆内。5.12大地震后发现,在同一地区,使用该技术的钻孔套管均未发生变形,其它套管则出了不同程度的变形,由此可见该技术的科学性和实用性。 Large diameter (diameter 168 ~ 600mm) engineering holes, not only need a good water stop effect, but also the need for effective drilling bushing fixed. Based on the analysis of the pressurized ash injection technology directly through the bushing, the successful development of the bored pipe water stop ash remover. The bored water-stop ash-settler utilizes the non-pressure release characteristic of the spring to press the upper cement slurry into the drill pipe under the action of the grouting pump so as to flow into the ash-pouring channel of the joint. The cement slurry has a top taper Top, the spring is compressed; and when the injection pump is no longer work, no pressure effect, the cone-shaped top against the mortar channel under the reaction of the spring, cone-shaped top conical seal mortar channel so mortar will not be anti Flow into the drill pipe. After the 5.12 earthquake, it was found that in the same area, no deformation was found in the bored casing using the technology, and the deformation of the other bushing was different to some extent. Therefore, the technology is scientific and practical.