The Moorgate shaft at Crossrail Liverpool Street station is one of the deepest in London, UK. Construction of the base slab to the 42 m deep shaft required close collaboration between the client, designer, contractor and suppliers to give assurance that the slab was watertight. Dense reinforcement was detailed to ensure ease of fixing within the tight confines of the shaft and allow for the tolerance on the diaphragm walls.The concrete design was developed to ensure that it met the requirements for placing and structural strength while achieving good control on the temperature developed. The concrete mix was trialled for temperature development and initial set to allow relaxation of the original specification. The pour plan was developed with the co-operation of all the site teams to ensure appropriate contingency measures were in place. Temperature monitoring was carried out to ensure that mitigation measures could be applied to control placed concrete temperature against predetermined trigger levels.
This paper describes an analysis of infill sheets of a combi-pile quay wall. Non-linear finite-element analysis of combi-pile infill sheets was required as the residual thickness of the selected infill sheet profile was thinner than the proscriptive requirements of the Eurocode base case and the geometric restrictions required wider infill sheets than permitted. The analysis enabled an assured design to be adopted. The variation of corrosion allowance down the pile was assessed in conjunction with the varying tidal lag behind the wall to determine the critical locations. The analysis required geometric and material non-linearities. The results of the analysis were compared with previous physical model testing. A simplified elastic analysis was validated for thin infill sheets under low water pressures.
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