Underpinning

Roger Bullivant

Grouting

Used to fill voids below ground level (primarily disused drainage or where the ground has settled below an existing floor slab).

Where 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.

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.

Knuckle Piles

Using primarily the bottom driven mini-pile, this system is used in an 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.

The advantage of this system is that as it uses only a single pile, it can be utilised in very restricted access situations.

Pile and Beam

This system can be used with all our mini piling options and is used in place of a knuckle pile.

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.

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 Underpinning

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 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.

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 RBL’s 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-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

Roger Bullivant

Roger Bullivant Limited (RB) is a foundation engineering company specialising in the design and construction of foundations for all types of buildings and structures in all kinds of ground conditions.

Foundation designs are individually...
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