Download NORTH AMERICAN TUNNELING 2004 by Levent. Ozdemir PDF

By Levent. Ozdemir

This e-book contains papers from the North American Tunneling 2004 convention, backed by way of the yankee Underground building organization. The topic of the convention is "Underground building - the practical way to city difficulties" to mirror the expanding value of finding city amenities within the usa underground for stronger protection, to construct serious infrastructure the place it's wanted and to enhance the functionality of city parts. The papers are grouped in 4 significant topics: - administration of Underground initiatives - Public coverage and Underground initiatives - Advances in know-how - Case experiences: Trials, Tribulation and Triumphs in Tunneling This paintings should still gain everybody excited about any point of infrastructure, tunneling and underground development.

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Notice-to-proceed was given in February 2001. The original contract duration was 1000 calendar days, giving a contract completion date in midNovember 2003, to meet a completion deadline imposed by the State of California. 2 Design changes A major design change was necessary on the ECIS project. The original design called for cast-in-place concrete structures at the bottom of each maintenance hole, some of which have junction structures for future sewer connections. The Contractor used 3-D Computer modeling to demonstrate that cast-in-place construction was impracticable and proposed an alternative scheme using pre-fabricated concrete and steel pipe.

These documents include: • 3 COUNTERMEASURES Besides detecting and preventing blast threats from the outside of tunnels, physical countermeasures for tunnels under blasting events include: • • • • • • Structure hardening to improve structure resistance to blasting load, Provide shielding around tunnel, such as tube in tunnel and separating tunnels from direct exposure to blasting, Provide shielding around critical structural elements, including ventilation and fire fighting systems, Provide mechanisms in a tunnel to automatically detect and isolate blasting events and prevent their spreading (a blast proof automatic venting system would be required), Ground strengthen around tunnels by contact grouting and consolidation grouting, Provide external groundwater cut off mechanisms around, above, or in the tunnel by ground improvement, slurry walls, and internal automatic bulkheads.

When VOEST Alpine Bergtechnik, situated in Zeltweg, Austria took the initiative in 1995 to start a research and development program under the acronym “Icutroc” the goal was to extend the range of economic applications for the existing roadheader lines by moving into territories of harder and more abrasive rock types. The project objective was to achieve the required target with a type of roadheader that does not exceed 130 metric tons of operating weight and to stay within a range of 300 kW installed power on the cutterhead.

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