"The two main railway tunnels run for 8.4 miles between West Ruislip and Victoria Road in Ealing, just beyond the new Old Oak Common station at depths of up to 35 metres."
"These cross passages were constructed using sprayed concrete lining (SCL), a technique in which small excavators gradually cut through the ground between the tunnel bores."
"The western section provided more challenging conditions, and 11 of the passages were built using ground freezing, stabilising water-bearing soils before excavation could begin."
"Completing the construction of the cross passages is an important step towards finishing the civil engineering works for the HS2 project."
Engineers have completed 34 hand-dug cross passages between two HS2 tunnels in west London. These passages provide emergency access between the main railway tunnels, which span 8.4 miles. The main tunnels were excavated using tunnel boring machines, while the cross passages were constructed by hand using sprayed concrete lining. The western section faced challenges, requiring ground freezing techniques for stabilization. With the passages finished, the next step involves installing reinforced concrete collars for fire-rated sliding doors as part of the safety systems.
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