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Forming the upstand spine beam on the base slab of the jle box structure

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Forming the upstand spine beam on the base slab of the jle box structure. Note the temporary plunge columns supporting the roof and bridging structure of the ell, above the excavation

Following temporary closure of the ell, cranked precast beams were used to rapidly form the inverted-arch base slab for the box structure.

Left:Tubular steel bracing for the piled wall, across the ELL excavation Right: Circular columns rise above the ell platforms to support the reinforced- concrete flat-slab roof, which also acts as the floor of the new bus station above it

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