Method of making a high-capacity earthbound structural reference

The method of constructing a high-capacity tension-sustaining earch-anchor reference having an axis of tension-sustaining alignment which is at angular offset from the vertical, which comprises excavating earth material to form an elongate generally cylindrical bore of a first diameter on said axis, then locally expanding the excavation to characterize a selected axial extent of the bore by local cutting to larger diametral extent at longitudinally spaced regions of the bore, each of the expanded excavations being characterized by a wall surface of relatively uniform slope with respect to the longitudinal axis of the bore and extending from said first to a second diameter, whereby the characterized bore is defined in a relatively undisturbed body of earth material, selecting a tension rod of length to span more than the characterized axial extent of the bore, said rod having one or more radially projecting formations for enhanced engagement to cementatious material, placing the rod within the bore in radially spaced relation with the bore wall and in coaxial relation with the characterized axial extent of the bore, and then casting a cementatious filling in the bore by smoothly introducing the filling into the bore, the filling being to an extent filling at least the characterized axial extent of the bore with the rod embedded to an extent short of the outer end of the rod, whereby upon curing, the cast filling is installed in a relatively undisturbed body of earth material, with an end of the rod externally exposed, thereby permitting maximum availability of the confined compressive strength of the earth material to enhance the tension-sustaining capacity of the earth-anchor.