Restricted access piles

In restricted access situations, where large, heavy conventional plant cannot be used, we provide a choice of piling systems such as continuous flight auger, cased CFA, rotary bored, drilled rock socket or driven. A number of our restricted access rigs are able to enter buildings via a normal service entrance or a standard doorway.

Process

The casing, with a diameter generally in the range of 100-1080mm is advanced to the design depth using a drilling technique.

Reinforcing steel, typically an all-thread bar, is inserted into the minipile casing and high-strength cement grout pumped in. The casing may extend to the full depth of the pile or finish short of the bond zone with the reinforcing bar extending to the full depth.

Capacities vary depending on the pile diameter and subsurface profile but compressive capacities of more than 2000kN have been achieved depending on ground conditions.

Specialist Contact | Anthony Lucas - [email protected] - +44 (0)7908 502122

Common uses

Sites where access or headroom are restricted
Sites with noise and/or vibration restriction
Areas where weight or surcharge limits apply
Operational retail stores, schools, hospitals, factories and hotels
Archaeologically sensitive sites
Underpinning buildings and structures from within

Advantages

Can be used to install piles inside existing buildings, under bridge structures and within tunnels
Can be used in all ground conditions, including obstructed ground and rock
Alleviates risk owing to reduced vibration and noise
Can be combined with other plant and solutions to maximise on-site efficiency and cost-effectiveness
Electric rigs can be used to reduce carbon emissions

Quality assurance

Keller has vast restricted access piling experience in all ground conditions with the ability to design in-house based on subsurface conditions, structural requirements and environmental limitations.

Related projects

Institutional/public

Catholic Apostle Church

Expert intervention from Keller has successfully underpinned and stabilised the foundations of a Grade I listed church.

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A rig being lowered into the grounds of the Catholic Apostle Church

Residential

Tooting Police Station

Keller has carried out specialist geotechnical work for the 'sensitive redevelopment' of a former art deco police station into apartments.

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Residential

2 Great George Street

As part of the £31m development of a Grade II former Victorian school, two floors were added to the four-story building which was being converted into 76 luxury apartments.

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Infrastructure

Embankment Stabilisation Scheme

An embankment between the Humber Estuary and the Network Rail Hull to Selby line needed strengthening after years of erosion.

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Infrastructure

South Cliff Stabilisation Scheme

Scarborough Spa is a Grade II listed building in South Bay, Scarborough, North Yorkshire, which is used as an events and entertainment venue. Work was needed to stabilise the cliffs behind Spa to prevent any future collapse.

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