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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 39 Abstracts search results
January 1, 1974
The so-called ROBOT method was developed several years ago during the construction of hydro-electric power plant in Sweden. . .Most of the concrete had to be placed immediately after mucking out, and before the next round could be drilled. . .The nozzleman works on a platform at the end of a long, truck-mounted boom which extends out over the muck pile.
(Conference Chairman's Note: It is very unfortunate that Mr. Boileau's manuscript covering the summary of Workshop V was misplaced subsequent to the conference and is not available for inclusion herein. The following brief summary was prepared by the Conference Chairmman.) The workship on "Shotcrete Design" met all day Wednesday, July 18, in a morning and evening session. Four speakers presented papers covering a wide range of design considerations.
Leland A. Case
The New Melones Projet sucessfully used shotcrete, in conjunction with 10' and 15' rock bolts, as a primary tunnel support method. The New Melones Diversion Tunnel was 3,800 feet long with a horseshoe cross-section nominally 30' wide by 18' to 24' below spring line.
Kenneth D. Hansen, Reporter
Contractor James P. Crawford of Sansan, Inc. began the session by relating his experience using shotcrete for structural rehabilitation on three projects. The first two projects were somewhat similar in that they were both railroad tunnel rehabilitations in Ohio.
James S. Goff
An economic need necessitated the experimentation and development of a high production nozzle that had a low maintenance factor. With commercial nozzles, as production increased, the maintenance factor accelerated and the nozzle itself proved to be a limiting factor for higher production. The shotcrete was used for rock support in an 18' horseshoe tunnel and was used primarily by itself to make the rock support itself in lieu of using shotcrete with rock bolts or steel sets. All of our equipment is rail-mounded with a sliding floor, and a "California Switch" in each heading.
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