Most of the systems use displacement methods for installation thereby minimising or eliminating altogether spoil arisings from pile installation.
There are many advantages from reduced spoil including cost, time and environmental benefits. Displacement pile installation methods are particularly beneficial on contaminated sites.
With projects ranging in value from a few thousand to several million pounds, we at Roger Bullivant Limited are confident that we can accommodate your piling needs and deliver the most cost-effective, value engineered solution to meet your construction programme and cost requirements.
PRECAST CONCRETE PILES
This pile may be used for all types of structures and foundations, from housing, through other forms of domestic building, to commercial and industrial buildings and installations. The piles can also be used for all types of civil engineering applications from bridges to embankment support, power and transmission towers and rail-related structures.
The RB Precast Concrete Piling System is quick to install and very cost effective in most ground conditions. This pile is environmentally attractive as no spoil or arisings are generated from pile installation.
The RB Precast Concrete Pile range includes piles for compression and nominal tension and bending, piles that accommodate compression and tension, and piles with full moment-transfer joints. Pile types are chosen and designed for individual project requirements thereby minimising waste and improving cost-effectiveness. The standard segment lengths of 1.5m, 3m and 4m can be complemented as required by 6m or 8m segments and by tapered lead sections or enlarged lead sections, as required.
RB precast concrete piles are usually top-driven using hydraulic drop hammers, some of which are super-silenced and are part of the company’s fleet of remotely operated Quiet hammers. Hammer capacities range from 1T up to 10T for our general purpose low noise, low vibration hammers and can be mounted on a variety of tracked rigs, depending upon project location, type, access and headroom constraints. All rigs are designed and purpose-built in-house to meet specific site access and transportation criteria. The smaller sizes of RB precast concrete pile may also be jacked into the ground using a totally vibrationless system utilising RB in-house designed and built jack-down piling rigs. Quality assurance procedures apply to pile manufacture and delivery, unloading, storage and installation. RB precast concrete piles are suitable for all open, unrestricted site activities, however the variety of segment lengths and existence of specialist equipment makes them ideal for restricted access and low headroom applications.
CONTINUOUS FLIGHT AUGER (CFA) PILES Application
General all purpose application for new and refurbishment projects.
The piles are speedily installed and can cater for a variety of ground conditions. They are cost-effective and can accommodate large working loads, depending upon the ground conditions into which they are installed.
The standard size range may be complemented with intermediate sizes if required and pile lengths of up to 19m can be constructed.
Standard reinforcement details are used where appropriate which will comprise single centrally positioned reinforcing bars or reinforcement cages as required to suit horizontal or bending moment loadings. Special cages can be manufactured to suit specific loading situations.
RB CFA piles are formed using hollow stem auger boring techniques, which will produce arisings from the bores in most UK ground conditions. Having produced a bore to calculated depth through known strata, concrete is pumped into the bore under pressure and continues to be pumped as the auger flight is lifted.
Concrete simultaneously fills the void left by the auger extraction. The reinforcement is installed in the bore after the pile has been concreted.
The company operates a fleet of bored piling rigs which have the capability of installing computer-controlled continuous flight auger (CFA) piles and sectional flight auger (SFA) piles. These are suited to all types of conditions from open, unrestricted access sites to very confined, low-headroom situations. TUBULAR STEEL PILES Application
Whilst clearly being suitable for taking large axial loads, these piles are particularly suitable for accommodating significant horizontal loads and vertical tension loads, induced by large bending moments/horizontal reactions and uplift/heave reactions respectively. Utilising recycled steel tube delivers both cost effective and environmental benefits.
These piles are also very suitable for driving in difficult or uncertain ground conditions up to 50m deep. Hard driving conditions and fill, obstructions or boulders can also be dealt with using this system.
These piles are top driven to ‘set’ or length using purpose-built rigs with hydraulic hammers. The internal void can subsequently be filled with concrete or grout if required and reinforcement incorporated for bonding into pile cap or ground beams. Normally the piles are driven open ended so that a soil plug is rapidly formed. In exceptional circumstances the open end can be closed using a welded end plate.
The site should be firm, dry, flat and level, and capable of sustaining the load of the piling rigs which typically will weigh up to 35T. Access roads must be suitable for normal delivery vehicles.
CONTINUOUS HELICAL DISPLACEMENT (CHD) BORED DISPLACEMENT PILES Application
This type of pile can be used for all foundation applications where bearing piles are required for either buildings or structures. The pile may also be used where there is a retaining requirement. The ability to form bored piles without producing any spoil makes this kind of pile particularly advantageous on contaminated sites. There is minimal vibration and noise.
In most ground conditions, this pile is an ideal alternative to CFA (continuous flight auger). Enhanced load carrying capacity may be achieved compared with CFA piles of similar dimensions, due to compaction of the soil during boring. In some ground conditions improvements of up to 30% have been demonstrated with a consequential shortening of the pile and reduction in cost.
The piles are formed using a highly efficient multi-flight bullet ended shaft, driven by a high torque rotary head, enabling penetration of the strata without bringing material to the surface. Data is recorded using computerised instrumentation.
Nominal surface heaving may occur but compared with the arisings from CFA boring, the volume is negligible.