During tunnel excavation by means of a tunnel boring machine (TBM), the lining consists of precast structural elements, placed by the TBM during the excavation process and used as support elements during the advancing phase. The use of concrete based on sulphoalu-minate binders allows the production of the elements to be speeded up , a reduction in the number of segments stacked waiting for the required strengths to be achieved and pro-vides a more eco-sustainable process avoiding the use of steam curing. In order to verify the feasibility of the proposed solution, two full-scale tests (bending test and TBM jacks thrust test) on metro tunnel precast segments were carried out. The internal reinforcement consisted of a next-gen Glass Fibre Reinforced Polymer (GFRP) cage. The use of GFRP reinforcement, to replace traditional steel, in tunnel segments provides several advantages mainly related to durability aspects or when the use of a provisional lining is foreseen.
Bianchi, M., Canonico, F., Nello, G., Meda, A., Rinaldi, Z., Spagnuolo, S. (2019). Precast tunnel segments with glass fiber reinforced polymer composite cage and sulphoaluminate cement. In Tunnels and Underground Cities. Engineering and Innovation Meet Archaeology, Architecture and Art: Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress (WTC 2019), May 3-9, 2019, Naples, Italy. London : CRC Press [10.1201/9780429424441].
Precast tunnel segments with glass fiber reinforced polymer composite cage and sulphoaluminate cement
Meda Alberto;Rinaldi Zila;Spagnuolo Simone
2019-01-01
Abstract
During tunnel excavation by means of a tunnel boring machine (TBM), the lining consists of precast structural elements, placed by the TBM during the excavation process and used as support elements during the advancing phase. The use of concrete based on sulphoalu-minate binders allows the production of the elements to be speeded up , a reduction in the number of segments stacked waiting for the required strengths to be achieved and pro-vides a more eco-sustainable process avoiding the use of steam curing. In order to verify the feasibility of the proposed solution, two full-scale tests (bending test and TBM jacks thrust test) on metro tunnel precast segments were carried out. The internal reinforcement consisted of a next-gen Glass Fibre Reinforced Polymer (GFRP) cage. The use of GFRP reinforcement, to replace traditional steel, in tunnel segments provides several advantages mainly related to durability aspects or when the use of a provisional lining is foreseen.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
