Cannons Close

The Bishops Avenue, London, Barnet, N2

JBDS undertook the off-site deep drainage connection and on-site deep drainage package at this prestigious location on the request of one of our repeat customers. We commenced with the sewer connection works prior to the main drainage works, as the site, was heavily congested with numerous trades. JBDS sunk a shaft 6.5m deep, from just within the site access road and drove a 12m long timber heading, out into the sewer on the main road. We connected the pipe, then commenced packing of the timber heading with dry leanmix concrete.

The team demobilised and retuned 6 weeks later to undertake the on-site drainage works. We had been a given 6-week window, where trades were envisaged to start slacking their operations on-site regarding their main works. The pipeline were located on an access road running along the rear of the site, with historic listed trees, adjacent to our works area. We liaised with our client to value engineer the most economical, least logistical strain on the client’s main access road (used for materials & plant storage).

The team excavated 6nr 2.1 diameter 7m deep manholes on site for the foul & surface water drainage. Additionally, each manhole constructed was to also be used to accommodate the directional drilling rig, which, was used site to accommodate the pipe run, which was, approximately, 70m of 150mm diameter verified clay pipe and 75m of 225mm diameter verified clay pipe. Once all drilling works were complete we then had to go back and modify each manhole suitable for use as the Auger Rigs require thrust walls and 1m foundations to each drive shaft.

The works were logistically challenging due to the other trades working on site, but regular meetings on site between ourselves and the rest of the project team meant we were able to overcome these problems with only minor programming adjustments needed.

The works were delivered on time and on budget.