PILING SOLUTIONS recently completed £45,000 worth of works on what it believes to be some of the largest and deepest limited access piles formed in London Clay.
The scheme was for a proposed utilities protection slab for Barhale on Nishimatsu/ Cementation Skanska's joint venture Channel Tunnel Rail Link Contract 220 near King's Cross.
A number of services had to be diverted temporarily while the piling was completed, the most sensitive being a 900mm high pressure water main.
Space was limited because piles had to be installed from within one half of the carriageway. Piling Solutions also had to contend with a headroom restriction of 4.1m for two of the piles because of the presence of the Barnesbury Rail Overbridge.
Originally four 600mm diameter, 21m deep and two 33m deep piles were called for, but because of water ingress into the pile shafts at depth on one of the low headroom piles, both 21m deep piles beneath the Rail Bridge were extended to 34m.
The CR18 MkII Rig used was custom built by Piling Solutions' sister company Piling Equipment.