Project led by Michael Meschino and Chongsong Yu while employed at a previous firm.
Tel Aviv, Israel
IBI Group Architects
10 stations; each 125 m long x 25 m wide x 20 m deep
Lead Structural Consultant
When complete in 2023, the Tel Aviv Red Line will provide light rail transit along a 23 kilometre length through the greater Metropolitan Tel Aviv area. A 10-kilometre section will run below grade through the most dense urban areas.
Ten stations are located along the 10 km below-grade section of the LRT line. Nine of the ten underground stations will have three levels: a platform level where the LRT vehicles will be boarded, a technical level where most major equipment will be located, and a concourse level which provides public circulation and fare gates, with stair/escalator access direct to the platform level. One two-level station exists at the end of the underground portion of the line. All stations will have up to four entrances, various shaft structures to grade and canopies over select entrances.
Challenge: Design the stations to be built below the water table with provisions to allow for subsequent entry of the Tunnel Boring Machines (TBMs) into the station sites.
Solution: Staged construction and TBM clearance/servicing provisions were incorporated into the design. The “outer box” excavation support system (braced perimeter diaphragm walls and concrete base “sealing plug”) were designed to be built under water using tremie methods to cut off groundwater to the site. Within this “outer box”, the station was designed such that the invert slab could be constructed after the walls and upper level slabs. This provides sufficient clearance for subsequent TBM entry and service train operation, and minimizes interfacing TBM and Station construction schedule risk.