Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Precast Concrete Tunnel Linings for Toronto Subway
Precast concrete tunnel linings have been used in the Toronto subway system in a wide range of soil conditions. This has resulted in a significant cost saving compared with the traditional cast iron lining. The linings are 16-ft. ID and are used without secondary lining. They are interchangeable with cast iron linings which are also used on the project. Eight segments plus a key are bolted with ¾-in. bolts to make a complete ring. Segments were produced at the rate of 200 per day in a precast concrete plant using steel forms. Specified concrete strength was 6,500 psi and over 7,000 psi was achieved. Erection was with the aid of shields of typical design. Some spalling and cracking occurred during shield shoving, but this type of damage was mostly superficial; replacement of damage segments was rare. Grouting outside the lining was carried out immediately after shield shoving using neat cement grout. The cost saving compared with cast iron lining is over $300 per ring.
Precast Concrete Tunnel Linings for Toronto Subway
Precast concrete tunnel linings have been used in the Toronto subway system in a wide range of soil conditions. This has resulted in a significant cost saving compared with the traditional cast iron lining. The linings are 16-ft. ID and are used without secondary lining. They are interchangeable with cast iron linings which are also used on the project. Eight segments plus a key are bolted with ¾-in. bolts to make a complete ring. Segments were produced at the rate of 200 per day in a precast concrete plant using steel forms. Specified concrete strength was 6,500 psi and over 7,000 psi was achieved. Erection was with the aid of shields of typical design. Some spalling and cracking occurred during shield shoving, but this type of damage was mostly superficial; replacement of damage segments was rare. Grouting outside the lining was carried out immediately after shield shoving using neat cement grout. The cost saving compared with cast iron lining is over $300 per ring.
Precast Concrete Tunnel Linings for Toronto Subway
Bartlett, John V. (Autor:in) / Noskiewicz, Ted M. (Autor:in) / Ramsay, James A. (Autor:in)
Journal of the Construction Division ; 97 ; 241-256
01.01.2021
161971-01-01 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Precast concrete tunnel linings
| Engineering Index Backfile | 1966
REHABILITATION OF PRECAST TUNNEL LINERS TORONTO SUBWAY
| British Library Conference Proceedings | 2005
Durability Design of Precast Concrete Segments for Tunnel Linings
| British Library Conference Proceedings | 2000