UndergroundOverhead Shooting against PVC Membrane
Frank E. Townsend III and Dennis Rubi
Read MoreOverhead shotcrete application against any substrate is challenging. Shooting against a polyvinyl chloride (PVC) membrane waterproofing system increases the difficulty and danger of the process.
RepairUndergroundShotcreting the East Side Access Program
Frank E. Townsend III
Read MorePrior to 9/11, all structural wall and tunnel concrete applications in New York, NY, used the form-and-pour concrete placement method.
UndergroundStructuralShotcrete Lining Innovations in the United States
Andy Thompson and Frank E. Townsend III
Read MoreHistorically, the permanent concrete linings for underground structures have been installed using form-and-pour methods but the use of shotcrete or sprayed concrete for the structural linings is becoming increasingly more common.
UndergroundTowards Automated Concrete Spraying
Lauro Lacerda and Marjo Koivisto
Read MoreOperating a remotely manipulated shotcrete placing system is one of the most demanding tasks in underground mining and tunnel construction.
RepairUndergroundShotcrete Use in the Gold King Mine Rehabilitation
Christoph Goss
Read MoreThe Gold King Mine Level 7 Portal is located at elevation 11,438 ft (3486 m) on the North Fork of Cement Creek, approximately 8 miles (13 km) north of Silverton, CO.
RepairUndergroundCreating a Foundation for Success: The Use of Lidar in Tunneling Projects
Carlos Gonzalez
Read MoreShotcrete placement requires close attention to safety; when combined with the difficult working conditions of a tunnel, overhead placement requires even greaterawareness of potential hazards.
RepairUndergroundSimple Still Works
John Becker
Read MoreCoastal Gunite Construction recently executed a few phases of a storm sewer rehabilitation in a line running under the Blue Plains Advanced Wastewater Treatment Plant operated by the District of Columbia Waterand Sewer Authority.
UndergroundStructuralInternationalGeneralCellular Sprayed Concrete
Kyong-Ku Yun
Read MoreCellular sprayed concrete is an innovative method of remixing ordinary portland cement (OPC) concrete into a high-performance concrete (HPC) by adding cellular material and silica fume or other powdered admixturesat a jobsite.
UndergroundShaft Lining with Dry-Mix Shotcrete
Lihe (John) Zhang, D.R. (Rusty) Morgan, Ted Walter, Brian McInnes, Andrew Rule, and Allen Mitchell
Read MoreThe Greater Vancouver Water District (GVWD), located in the lower mainland region of British Columbia, Canada, constructed a new water supply main in a tunnel under the Fraser River, just downstream of the PortMann Bridge.
RepairUndergroundLiverpool Central Tunnel High-Level Neck Repairs
Andy Dunlop and David Thomas
Read MoreLiverpool?s High-Level Neck tunnel (HLN) cannot lay claim to being the city?s most famous cavern, but it can justifiably be labeled as being one of the most unusual and challenging tunnels on the entire UK rail network.