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Underpinning

Underpinning We carry out work for all the major insurance companies; we also carry out domestic and commercial underpinning for barn conversions and retro-fit basements.  All of our underpinning works carry a 12 year ASUC insurance backed guarantee.

Grouting
Used to fill voids below ground level (primarily disused drainage or where the ground has settled below an existing floor slab).  Where we are grouting below an existing slab, a series of small diameter holes are drilled through the existing concrete and the grout is pumped under a low pressure to fill any voids which may be present and in some circumstances may be capable of lifting an existing floor slab back to its original position dependent on the construction of the slab.  This is the only underpinning system we use that unfortunately cannot be guaranteed because we are reliant upon the ground directly below our works remaining stable.

Pin Pile and Grout
This method is used to stabilise existing floor slabs.  A series of small diameter holes are drilled through the existing concrete and grout is pumped under a low pressure to fill any voids which may be present.  A series of larger diameter holes are then drilled on a designed grid through the existing concrete.  Piles are then top driven through the slab and concreted, using the bond of the existing slab and the new pile concrete to give secondary support to the slab.

Knuckle Piles
Using primarily the bottom driven mini-pile, this system is used to the area of a property that may have been affected by either settlement or heave.  A mini-pile is installed and a pocket of brickwork is removed and a reinforcement cage inserted which is then concreted in place after inspection by the relevant authorities.  The advantage of this system is that as it uses only a single pile, it can be utilised in very restricted access situations.  This method can be used in either a settlement or a heave condition.

Pile and Beam
This system can be used with all our mini piling options and is used in place of a knuckle pile where the loads are greater.  Mini-piles are installed to either side of the affected wall, a pocket of brickwork is then removed below ground level and a reinforcement cage installed to bridge over the two piles.  This is then inspected by the relevant authorities and then concreted.  This method can be used in either a settlement or a heave condition.

Cantilever Pile and Beam
If access is sufficient to save disruption to the inside of a property this system can be used.  The method of installation is as per the pile and beam, however, all of the works are carried out from the outside.  This method can be used in either settlement or a heave condition.

Traditional UnderpinningUnderpinning
The oldest method of underpinning used, where the affected wall has sections excavated in a hit and miss sequence to a designed depth below the existing foundation.  This is then inspected by the relevant authorities and then backfilled with concrete.  This method is carried out until all of the affected area has been underpinned.  This method can be used in either a settlement or a heave condition.

Piled Raft
This system is used when it has been decided that the whole property has been affected.  All existing floors are removed and mini-piles are installed.  Pockets of brickwork are then removed and reinforcement placed as per the design.  This is then inspected by the local authority and then concreted.  This method can be used in either settlement or a heave condition.

Twin Pile
This system is a pile and prop drilled through the existing brickwork/concrete foundation at a designed distance between each position to support the affected area used from the outside only.  This is probably our quickest and most unobtrusive method of underpinning.

Angle Pile
This system is comprises mini-piles drilled through either side of the affected brickwork/concrete foundation at a designed distance between each position to form a support using the bond of the mini-pile concrete to the existing concrete/brickwork foundation.

Jack Down Pile
This system is used where a vibrationless system capable of supporting high compressive loads is required.  The mini-piles are installed through either an existing or newly constructed foundation.  Installation of the mini-pile is vibrationless and noise levels are greatly reduced.  The mini-piles are installed to a designed loading that can be monitored whilst the mini-pile is being installed.  The mini-pile relies upon the reaction of the existing building and either the newly constructed foundation or holding down bolts which have been installed into the existing foundation.

Structural Lifting
This is used where it has been deemed that a stabilisation scheme alone will not be sufficient.  Therefore upon completion of the mini-piling and raft or concrete beams the property is then lifted back into position and held using a series of conical formers within the beams or raft which are then concreted.
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Roger Bullivant Limited
Walton Road, Drakelow, Burton-upon-Trent, Staffordshire, DE15 9UA
Tel : 01283 511115
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Company Reg no. 07681731