A boring head for steel tubing is provided. The boring head for metal tubing comprises a cylindrical body, a conic point, and engaging female threads. The cylindrical body has inner wall and outer wall portions with predetermined inner and outer diameters respectively, and comprises a front opening, a rear opening, and a concentric rear end portion. The conic point is configured to penetrate and bore a hole through an external medium. The engaging female threads are configured to receive and engage a metal tube put into the cylindrical body, and the metal tube includes engaging male threads that are corresponding to the engaging female threads. The conic point makes a hole through the external medium, being pushed by the metal tube and leading the metal tube. In addition, the boring head may be provided with a hammering member to be engaged to the rear end of the metal tube.

A boring head for copper tubing is provided. The boring head for copper tubing comprises a cylindrical body, a conic point, and a fixing hole. The cylindrical body has a predetermined inner diameter and a predetermined outer diameter with a front opening, a rear opening, and a concentric rear end portion. The conic point extends from the front opening of the cylindrical body, and the conic point is configured to penetrate and bore a hole through an external medium. The fixing hole is provided through a side wall of the cylindrical body and configured to fix a copper tube put into the cylindrical body. The conic point makes a hole through the external medium, leading the copper tube through the hole.

A directional boring system includes a hammerhead mole that is fluidly coupled to a power source. The hammerhead mole selectively bores underground in a selected direction. A steering unit is movably coupled to the hammerhead mole and the steering unit frictionally engages the ground at a selected angle. In this way the hammerhead mole is steered in the selected angle. A remote control is provided and the remote control is in wireless electrical communication with the steering unit. In this way the remote control controls movement of the hammerhead mole.

A method of installing a tubular heat exchanger into soil includes providing the tubular heat exchanger and screwing the tubular heat exchanger into the soil with an installation apparatus. The installation apparatus may be removed from the soil without removing the tubular heat exchanger from the soil.

A method of installing a tubular heat exchanger into soil includes providing the tubular heat exchanger and screwing the tubular heat exchanger into the soil with an installation apparatus. The installation apparatus may be removed from the soil without removing the tubular heat exchanger from the soil.

Disclosed is a comprehensive excavation process performed on an excavation site. The process includes installing wellpoints for lowering the groundwater level within the excavation site and stabilizing the boundary soil walls of the excavation site by an improved soil nailing method. The improved soil nailing method employs casing pipes that are part of the wellpoint system as reinforcing elements for the stabilization of the soil walls.

A pipe puller system and methods of pipe extraction are shown. In one example a pipe to be replaced is pulled by attaching a pulling force to multiple locations along a length of the pipe. In one example pulling forces can be varied between different attachment locations to better control or eliminate tearing of the pipe. In one example, a pipe loosening device may be used prior to pulling the pipe from the ground.

A method of installing a tubular heat exchanger into soil includes providing the tubular heat exchanger and screwing the tubular heat exchanger into the soil with an installation apparatus. The installation apparatus may be removed from the soil without removing the tubular heat exchanger from the soil.

A cable retention and release mechanism includes a cable gripping device including a cable passage. A cable extends through the cable passage. A cable gripping device collar is movably coupled around the cable gripping device. An outer cable gripping device surface is seated against a cable gripping device receiving inner surface preventing movement of the cable gripping device relative to the cable gripping device collar. The cable gripping device receiving inner surface clamps the cable gripping device on the cable and prevents sliding movement of the cable. A jack is movably coupled with the cable gripping device collar. In a first engaged position the jack is engaged against the cable gripping device proximal end. In a second engaged position the jack unseats the outer cable gripping device surface from the cable gripping device receiving inner surface and releases the clamping of the cable.

A drill string with a bit at one end is used to dig an underground borehole. When the drill string exits the borehole at a surface exit point, a pullback adapter is used to interconnect the bit with an above-ground utility line. A drilling rig retracts the drill string from the borehole. As the drill string is pulled back through the borehole, the trailing utility line follows along its underground path. As the utility line is pulled through the borehole, the connector biases the utility line to the center of the borehole. Such biasing reduces the risk of ensnaring of the connector and utility line by the borehole walls during the pulling process.