Shotcrete tunnel construction pdf

The use of shotcrete for tunnel final linings has gained increased popularity on a national and. In this paper, four types of shotcrete slabs with polyolefin and steel fibers are compared, compared to nonfiber shothcrete and reinforcement mesh. The slabs were built in real conditions during the construction of the primary tunnel linings for the construction of the tunnel in the cortanovci show on figure 1. Especially useful for primary sprayed concrete linings. Best practices of using shotcrete for wall fascia and.

As illustrated in figure 1, dry shotcrete components. Shotcrete, the quarterly publication of asa, is the leading magazine of the shotcrete industry, and is designed to educate and promote the use of shotcrete as a method of placing concrete. For information on the mixers, pumps, and other machines used in the shotcrete process, search the web for shotcrete machine download this article as a pdf here 2. Arlberg and simplon railway tunnels during which adverse tunnelling. The selected design involved the construction of a sprayed concrete lined adit. Primarily, these issues would include selection of applicable design parameters. Shotcrete for tunnel final linings design and construction considerations v. Initially, shotcrete was applied either plainly or reinforced with conventional reinforcing steelwelded meshes or even occasionally with chain link meshes. Candidate graduate research assistant washington state transportation center trac washington state university, department of civil and environmental engineering sloan hall, room 101. The shielddriven tunnelling method has been mainly adopted for the construction of urban underground tunnels in soft ground due to its flexibility, cost effectiveness and the minimum impact on.

These approaches, which aim at making the best use of the ability of the ground to. Sprayed concrete for underground excavations a status. Sprayed concrete linings have been used extensively on the. Best practices of using shotcrete for wall fascia and slope stabilization phase i study by pizhong qiao, ph. Silicafume shotcrete has been widely used in tunnel construction often combined with fibers to control shrinkage cracking as well as for tunnel rehabilitation purpos es parker et al. Multi layered shotcrete design for tunnel construction.

Modern use of wet mix sprayed concrete for underground support. Shotcrete in tunnel construction introduction to the basic technology of sprayed concrete jurg schlumpf jurgen hofler. New developments in rock engineering, tunneling, underground space and deep excavation proceedings 942017 multi layered shotcrete design for tunnel construction matthias werner beisler ilf consulting engineers, austria, matthias. The work shall consist of furnishing, mixing, applying and curing shotcrete. Cerulli parsons brinckerhoff construction services abstract. When evaluating if shotcrete should be utilized as the final tunnel lining, several aspects should be carefully evaluated to determine the final products quality and durability, as well as cost and construction schedule implications for a given tunnel configuration. Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. Introduction to the basic technology of sprayed concrete. Different reports can typically be generated to pdf, excel etc. Sika develops specialized products for the production and application of sprayed concrete. Shotcrete is a process where concrete is likely to apply under pressure, using a gun onto a surface to form structural shapes. In order to check the structural behaviour of sfrs in a tunnel construction.