So it has the merits of lower price, liable quality, no slurry pollution, penetrating easily the silty and silty-sand layers, efficient construction etc.
So it has the merits of lower price, liable quality, no slurry pollution, penetrating easily the silty and silty-sand layers, efficient construction etc.
具有工程造价低，质量易于保证，无泥浆污染，能穿过粉土、粉砂层，施工速度快的优点。