Method of supporting soft layer with self-drilling bolt support

The present invention is method of supporting soft layer with self-drilling bolt support. The bolt support consists of and hollow pipe, the conic auger is fixed to the tip of the pipe, and the pipe has continuous or intermittent spiral wings in the outer surface. After the self-drilling bolt support is drilled into soil, cement mortar is injected into the pipe and the solidified mortar applies pre-stress to the tip. The present invention is suitable for construction in various soft soil layer. During construction, no flowing sludge flows out, so that there is no need of sludge bag. The present invention has excellent anchoring effect. 一种利用自钻式锚杆支护软弱土层的方法，所述的方法是采用一种自钻式锚杆，所述的锚杆由钻头和中空的管体构成，所述的钻头为圆锥体状，所述的钻头设置在所述的锚杆的前端，所述的钻头和所述的管体固定连接，所述的管体的外侧表面设置有螺旋状凸起翼，所述的凸起翼为连续或不连续，将所述的自钻式锚杆钻入土层中，然后在杆体中注入水泥浆或者水泥砂浆，当浆液固化后，即可在锚杆的端部施加预应力。本发明适合在粉质粘土、淤泥质粘土、砂质粘土、细砂层中施工，施工时不需要特别硬质的合金钻头，即可将锚杆钻入土层中，而且没有流塑性淤泥流出。注浆时不需要专门的止浆袋封孔，获得良好的锚固效果。