Helical anchors consist of an assembly of steel shafts with a series of helical steel plates attached on a pitch to create a screw anchor. These steel anchors can be screwed into the ground to create foundation support, tie back wall systems and soil nail wall systems. It is screwed into the ground until there is enough torque resistance to indicate sufficient bearing strength. The capacity of a helical anchor in compression or tension is based upon the bearing capacity of the helices against the soil in which it is embedded. Therefore the capacity increases as the area of the helices is increased and as the soil friction angle increases. During installation, the torque resistance of the anchor is monitored and provides verification when the anchor capacity is achieved. It provides working/design compression and uplift capacity on the order of 30 to 100 kips depending on the soils encountered. The benefits of this system is that they eliminate the need for grout to set up to gain capacity, and eliminates disposal of spoils, which is especially important when installed in contaminated soils.

Horizontal earth boring machine is a machine used to bore horizontally through the earth by means of a rotating tool, or non-rotating pushing or piercing tool. It has an engine and an earth boring string wherein a hydraulic clutch driven by the engine is supplied with hydraulic fluid through an electrically operated valve. It is capable of transferring drill cuttings from the boring area back through the machine to allow for more efficient boring through both hard and soft rock strata is disclosed. It has an air powered hammer bit drill with air passageways for flushing the boring area and also has a rotary drive for use in rotating augers secured inside a casing for transporting the drill cuttings back through the casing and out an air diverter discharge near the front of the machine.