Composite self-drilling soil nail and method

A method of placing a soil nail, said method comprising:

• providing:
• (i) a first threaded outer member having a bore extending therethrough;
• (ii) a second threaded outer member having a bore extending therethrough;
• (iii) a threaded coupler interconnecting adjacent ends of the threaded outer members;
• (iv) a threaded inner member placed through the bores of the first and second outer members;
• attaching the proximal end of the outer member to a drilling machine, and drilling said soil nail into the ground to a desired depth;
• securing a bearing plate having an opening, and placing said bearing plate over a proximal end of the outer member;
• threading a first nut over the outer member and against said bearing plate;
• and
• threading a second nut over the proximal end of the inner member and against the first nut.

A method of improving the pull-out capacity and adhesion of a soil nail, said method comprising:

• providing a soil nail member including at least one of an outer tubular member and an inner member;
• providing a galvanizing tank having a molten metal therein;
• maintaining dross of the molten metal and disbursing the dross by stirring the molten metals;
• dipping the soil nail member into the molten metal wherein upon cooling, said soil nail member has a rough surface comprising a layer of applied metal and dross particles.

A method of repairing a roadway in which a slip plane exists beneath the roadway surface, said method comprising:

• locating the slip plane;
• excavating beneath the roadway surface;
• placing a plurality of soil nails, said soil nails being placed substantially perpendicular to the slip plane, each of said soil nails comprising an outer member and inner member placed within the outer member, cementious material placed within the outer member to hold the inner member in place, a plate placed over said inner member, said plate having an opening for receiving an upper end of inner member extending above the upper end of the outer member;
• and means for securing the plate to the inner member;
• filling the excavated area;
• and
• resurfacing the roadway.