Abstract: A soil or rock nail retaining wall with an outer face is provided. A method of constructing such a wall is also set forth. A cut is excavated in successive sections to form exposed cut faces. The exposed cut face of each successively excavated section is temporarily supported with a temporary support means comprised of a nail installed through the exposed cut face into the ground. Shotcrete or a layer of barrier material may also be used in forming the temporary support means. Next, an outer face is formed. Facing elements are attached to the nail-supported cut via an isolated reinforced concrete closure. Formwork is used in placing the reinforced concrete closure. The reinforced concrete closure ties together the facing elements and the nail. Finally, free-draining granular backfill material, such as porous concrete, gravel or crushed rock, is placed along the remainder of the retaining wall between the exposed cut face and the facing elements.

Abstract: A replacement earth retaining wall and a method for modifying, repairing, or replacing an existing earth retaining wall is disclosed. The replacement wall includes a reinforced concrete facing, and soil nails or tiebacks with specially fabricated anchorhead assemblies. The structure includes a concrete panel cast adjacent the face of an existing retaining wall such as a corrugated bin type wall. Tiebacks or soil nails are installed through the existing wall and are encased in the reinforced concrete panel. During construction, tiebacks, where used, are installed through the existing wall and are tensioned against the front face of the existing wall before the concrete panel is cast. The concrete panel is supported by and encases the anchorhead assemblies and covers the outer face of the existing wall. The anchorhead assembly includes a load distribution member, a tube, and tension studs extending from the load distribution member.

Abstract: The present invention is directed to a method of installing a high-capacity tieback in coarse-grained soil. The method includes connecting a unitary hollow casing to a drill and inserting a prestressing steel tendon within the casing. A lost bit is affixed to one end of the casing. The drill and casing is positioned at the desired location of the tieback and the casing is inserted into the ground by rotating the casing with the drill. The bit is released and grout is pumped into the casing under high-pressure. Once the grout has reached the desired pressure, the casing is extracted by applying a high-torque of at least 12,000 ft.-lbs. to the casing with the drill which overcomes the frictional engagement between the grout and the casing, and by applying a pulling force with the drill.

Abstract: A tied back retaining wall structure is disclosed comprising channel-shaped sheet piles, a reinforcing bar matrix and a concrete wall encasing the matrix and filling the channels of the piles. The reinforcing bar matrix comprises an array of laterally disposed reinforcing bars which span the spaces between the piles. Headed studs welded to the piles insure a secure connection of the wall to the piles. A method of constructing such a wall is disclosed which comprises excavating downwardly in stages after installing sheet piling in the ground, erecting a reinforcing bar matrix and pouring or spraying concrete over the structure to form the finished wall.

Abstract: A tied back retaining wall structure is disclosed comprising channel-shaped sheet piles, a reinforcing bar matrix and a concrete wall encasing the matrix and filling the channels of the piles. The reinforcing bar matrix comprises an array of laterally disposed reinforcing bars which span the spaces between the piles. Headed studs welded to the piles insure a secure connection of the wall to the piles. A method of constructing such a wall is disclosed which comprises excavating downwardly in stages after installing sheet piling in the ground, erecting a reinforcing bar matrix and pouring or spraying concrete over the structure to form the finished wall.

Abstract: An earth tieback comprising a steel tendon rod anchoring a structure to the earth, the tendon rod having double corrosion protection provided first by a thin hard coating of corrosion resistant plastic throughout its length and second by concrete grout over the anchor zone of the rod and by a heat shrunk plastic tube tightly encapsulating the unbonded zone of the rod.