Typical Applications: Sewer line, water line or storm drain installation (or any project that exceeds the capabilities of auger boring equipment).

Description: To create large bores in virtually any soil condition (including solid rock) typically requires large diameter tunneling. One of two methods are typically used. The first uses a Boring Machine Tunnel Attachment (BMTA) with a cutting head. A steel casing measuring 60” or larger is installed behind the BMTA and both are propelled by a jack and bore machine. Personnel are required inside the tunnel to operate the BMTA machine. The spoils are removed by auger, conveyor belt or muck carts.

In applications where soil conditions make other methods impractical, hand tunneling with jackhammers is used to break up the soil. A jack and bore machine then “jacks” the steel casing into the ground.

Limitations: For steel casings 36” in diameter and larger with no limit on linear feet.

Considerations:

	Suitable for any soil condition
	Can accommodate a wide size and scope
	Time intensive
	Labor intensive
	Wide cost range

Preview Large Diameter Tunneling Project: