Whilst WJ are well known and respected as one of the leading dewatering contractors in the UK, we have many other services within our oeuvre. We recently demonstrated one of these whilst undertaking in-tunnel probe drilling as part of the Thames Tideway works at the Dormay Street Shaft in Wandsworth, South London.
As part of the multi-billion pound Thames Tideway ‘super-sewer’ scheme underneath London it is necessary for a connection tunnel to be constructed, dubbed the ‘Frogmore Connection Tunnel’, connecting King George’s Park in Wandsworth to the Carnwath Road site on the north of the River Thames in Fulham.
WJ have been undertaking pumping tests and dewatering on a number of Thames Tideway sites since early on in the project, however as part of the construction of the Frogmore Connection we had the opportunity to showcase one of other services. Prior to each advancement of the tunnel, a WJ SM5 drilling rig would drill a number of investigative probe holes at a range of inclinations from horizontal to 12⁰ from the horizontal and 12⁰ to the left and right, collecting geological samples with each probe.
Whilst inclined in-tunnel drilling and probing is not uncommon in the UK, WJ are one of the best equipped companies to undertake such works, due to our extensive experience of in-tunnel work from the Thames Tideway, Crossrail and Northern Line Extension works, amongst other projects, our highly experienced drilling and supervisory staff, and our fleet of drilling rigs capable of drilling in restricted tunnel environs at a range of inclinations of directions.
You can learn more about WJ’s probing services here.