Underground Shotcrete Roof Repair of Hanging Lake Tunnel

During a Federal Highway Administration annual safety inspection in March 2007, a crack was found in the flat roof portion of the cut and cover section of the Hanging Lake Tunnels along Interstate 70 in Glenwood Springs, CO.

Chetoogeta Mountain W&A Railroad Tunnel

Historical restoration/preservation is not only a challenging field of construction but also one that offers the special reward of preserving history for future generations,

When to Extract Cores

During preconstruction testing and mockups, as well as during shotcrete production, a minimum specified compressive strength is always required in the project specification.

The Danger of Fallouts in Overhead Shooting

The volume of shotcrete required to cover an area of only 3 ft2 (0.3 m2) with a 4 in. (100 mm) thickness would typically weigh approximately 140 lb (64 kg), a weight that?if dropped from a height of 10 ft (3 m)?would seriously endanger the life of any individual standing below it.