Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New York City No.7 Subway Line Extension Project Mitigating Construction Impact At Shaft A
The existing MTA-New York City Transit's (MTA-NYCT) No. 7 Subway was built in the early 1900's and currently terminates at Times Square near 41st Street and Seventh Avenue. As part of the City's redevelopment of the west side of Manhattan, the MTA-NYCT's No. 7 Subway extension project will add approximately 1.5-miles of twin tunnel alignment to the current line. The proposed alignment will extend from the existing Times Square Station west beneath 41st Street then turn south under 11th Avenue and terminate between 24th and 25th Streets. The project will include two new stations, a two-track line station and a three-track terminal. The project includes two major construction contracts: the running tunnels which would include TBM launching shaft (Shaft A) and retrieval shaft (Shaft L), and (2) the follow-on contract, which would include drill-and-blast mined cavern enlargements of the two stations and the drill-and-blast excavation for tunnels connecting the end of the TBM running tunnels to the existing No. 7 Subway Line at Times Square Station. This paper will focus on how Shaft A will be designed and constructed to mitigate impact on adjacent properties and utilities. A stiff support system will be adopted to minimize deflections to the shaft walls. Instrumentation will be utilized to monitor the performance of the support system and to verify the design and predicted effects of construction. The instrumentation will be designed to monitor actual loads and deflections within the shaft as well as the associated ground movements and settlements.
New York City No.7 Subway Line Extension Project Mitigating Construction Impact At Shaft A
The existing MTA-New York City Transit's (MTA-NYCT) No. 7 Subway was built in the early 1900's and currently terminates at Times Square near 41st Street and Seventh Avenue. As part of the City's redevelopment of the west side of Manhattan, the MTA-NYCT's No. 7 Subway extension project will add approximately 1.5-miles of twin tunnel alignment to the current line. The proposed alignment will extend from the existing Times Square Station west beneath 41st Street then turn south under 11th Avenue and terminate between 24th and 25th Streets. The project will include two new stations, a two-track line station and a three-track terminal. The project includes two major construction contracts: the running tunnels which would include TBM launching shaft (Shaft A) and retrieval shaft (Shaft L), and (2) the follow-on contract, which would include drill-and-blast mined cavern enlargements of the two stations and the drill-and-blast excavation for tunnels connecting the end of the TBM running tunnels to the existing No. 7 Subway Line at Times Square Station. This paper will focus on how Shaft A will be designed and constructed to mitigate impact on adjacent properties and utilities. A stiff support system will be adopted to minimize deflections to the shaft walls. Instrumentation will be utilized to monitor the performance of the support system and to verify the design and predicted effects of construction. The instrumentation will be designed to monitor actual loads and deflections within the shaft as well as the associated ground movements and settlements.
New York City No.7 Subway Line Extension Project Mitigating Construction Impact At Shaft A
Das, P. K. (Autor:in) / Daugherty, C. (Autor:in) / Roberts, R. B. (Autor:in) / Wang, E. C. (Autor:in) / Chang, C. C. (Autor:in)
Structures Congress 2004 ; 2004 ; Nashville, Tennessee, United States
Structures 2004 ; 1-9
21.05.2004
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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