Piling, Bath Somerset

Project Brief:

Advanced Mini Piling Systems was contracted to provide piling services for a local property development company based in Bath. The site is at the top of Bath overlooking the whole city. There are 5 plots on the site, each with a 4-5 bedroom luxury home. 3 of the plots were based on traditional foundations, because they were on the crest of the hill and based into the natural layer of brash (local stone).
The 2 remaining properties are located on the bottom of the site below the crest of the hill, and both have basements in their designs. The commencing surface level would be below the layer of brash and into the fullers earth. Lateral and vertical loads could not be gained via traditional strip footings, which meant that these 2 properties would require piling.

Our engineer choose to use 220mm dia Steel cased bottom driven piles, with a 300mm thick reinforced concrete slab. One of the problems we came across while driving the piles was that they hit softer layer of stone, which made the piles bend off vertically. This happened in every location we tried. In order to save the client time and money, and as the access to the site was restricted, the option for a bigger CFA rig was out of the question. The solution we came up with was to base the piles in the soft stone, which meant they were shallower. We also doubled up all the heavily loaded piles.

Scope of works

*Mobilise D1000H to site.

*All 220mm dia steel cased tube delivered to site in two loads.

*Install all piles to engineers specifications.

*Reinforcement for piles.

*Set up safe location for mobile boom pump.

*Concrete all piles.

Steel cased bottom driven piles Bath, Somerset.
Steel cased bottom driven piles Bath, Somerset.

The 3.0m firsts plugged up, and ready to be driven in plumb; The D1000H can lift its driving hammer over 3.0m which means the rig can drive, while other casings are being welded together which gives us a higher productivity.

Casings being driven and welded at the same time.
Casings being driven and welded at the same time.
Sheet piled retaining wall to be removed once piling and ground works are finish, a R/C water proof wall will take its place.
Sheet piled retaining wall to be removed once piling and ground works are finished, and reinforced waterproof concrete wall will take its place.

We achieved very close centres to the temporary retaining wall.

Concreted piles with reinforcement inserted and protective caps.
Concreted piles with reinforcement inserted and protective caps.

All piles concreted with a mobile boom pump and a C35 pump mix.

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