By Steve Redmond, Victor Romero
Each years, specialists and practitioners from all over the world assemble on the prestigious fast Excavation and Tunneling convention (RETC) to profit concerning the most up-to-date advancements in tunneling know-how, and the signature initiatives that support society meet its starting to be infrastructure wishes. within this authoritative 1608-page booklet, you will discover the one hundred fifteen influential papers that have been provided offering worthwhile insights from initiatives all over the world. you will achieve from the teachings learned--often the tough way--from huge and significant initiatives in tricky flooring conditions.
This ebook will take you underground for a pragmatic, up-close check out headline-making initiatives from around the world. almost each element of tunneling is tested. it really is an imperative source for layout and building engineers and contractors within the large-scale civil tunnel who are looking to remain at the cutting edge in their career
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Additional info for 2011 Rapid Excavation and Tunneling Conference Proceedings
87 m (16 feet). This permitted access over the concrete plug to allow the stripping of the bulkheads after pouring the concrete. The rock arch support was designed to span over the diverging tunnels along the full length of the concrete plug assuming no contribution from the pillar itself. To construct the concrete plug, several key issues required resolution. The first was to identify a surface location within approximately 610 m (2,000 feet) suitable for pumping approximately 2300 cubic meters (3000 cubic yards) of concrete After several meetings with the different community boards, the contractor was able to establish a concrete drop pipe location which met the requirements at East 52nd St and Park Avenue.
Removal of concrete muck can be difficult while maintaining TBM advance (usually shuts down TBM for couple weeks). The cost of concrete plug construction is usually offset by the reduced cost of labor during re-launch. 45 m (8 feet) and taking advantage of eliminating the need to extend the caverns. So the first change for the GCT5 Interlocking wye excavation was to reduce the overall length by some 30 m (100 feet) and introduce a concrete plug for the TBM to push off. At this stage it was still the intention to mine the westbound wye excavation through a rock/concrete interface and the eastbound wye excavation by reassembling the TBM within an excavated cavern.
The cavern walls followed a direct parallel offset of the Track Alignment Centerlines, to ensure proper train clearances, at the same time permitting reductions in the rock excavation volume while improving ventilation. The adjustable formwork assembly had a series of telescopic struts that can be hydraulically operated to rotate segments of the formwork into place, and can adjust horizontally and vertically, resulting in a smooth transition for the widest to the smallest cavern section. The cross sectional geometry of the cavern maintained two constant radii—the single crown and the dual shoulder arches with variable sweep angles.
2011 Rapid Excavation and Tunneling Conference Proceedings by Steve Redmond, Victor Romero