GEOTHERMAL PILING
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
Due to the thermal conductivity of concrete the energy can be transferred through plastic pipe loops fixed to steel reinforcement cages within CFA, rotary or driven piles. Central Piling has experience of working closely with consultants and clients to ensure a problem free integration of the geothermal pipework into the structure.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
ROTARY PILING
ROTARY PILING
Construction technique & application
By utilising a telescopic kelly bar our large rotary rigs create the pile bore through the removal of the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete. Where piles are used for deep basements it may be permissible to leave the concrete at a low level in order to reduce pile trimming.
Rotary piling is generally used in dry stable soils and rocks. However in cohesionless soils, piles may still be formed with the use of casing or drilling fluid to support the bore.
For small diameter piles operating in stable soils throughout the foundation depth, our CFA rigs can efficiently create an open hole auger (OHA) pile. It is also worth noting that our mini rigs adopt a sectional flight method to create the pile bore as their mast height restricts the use of a kelly bar system.
Plant & equipment
We have a wide variety hydraulic rigs ranging from 2.5T to 80T. This provides pile sizes ranging from 250mm to 2500mm and up to 77m depth. The short mast height and small footprint of some of the rigs mean that most sites are accessible with our equipment.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
MINI PILING
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
Personnel are trained to adopt safe systems of working in confined spaces and additional equipment can be provided to insure fumes are extracted from the working area.
FURTHER TECHNIQUES
FURTHER TECHNIQUES
Anchors
Ground anchors and soil nails are commonly used to stabilise slopes and excavations, generally in conjunction with other geotechnical products.
Using our restricted access equipment we can, for example, provide anchors to support retaining walls. This reduces the need for pile sizes, potentially increasing basement size and reducing costs. They are formed using high strength steel bars embedded to a predetermined depth with grout used to bond the anchor to the soil. Reduced wall settlements can be achieved by pre-stressing the anchor prior to the basement excavation.
Grouting
Central Piling offer permeation and infill grouting alongside piled solutions where solution features or man-made voids exist. A variety of machines can be used to install a relatively low strength mix to ensure the stability of the soil mass is achieved and that drilling of piles beyond the affected zone is possible.
Other Products
On selected contracts, in addition to the piling works, we offer a variety of other products. These include: piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
This can be supplemented by the provision of on-site engineering support and management, welfare units and toilet facilities.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
DRIVEN PILING
Driven Piling
Construction technique & application
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
Central Piling offer a bottom driven steel cased system with additional sections of casing being welded on as required. Reinforcement and concrete is then placed in the casing to provide a connection to the overlying structure. On selected contracts we can also provide pre-cast concrete piles.
Driven piling is particularly appropriate where soft and alluvial soils overlay dense sands and gravel
Plant & equipment
To carry out driven piling we utilise 25T crane mounted crawler rigs, 55T hydraulic rigs and where access is restricted a 2.5T mini rig. If necessary machines can be supplied to pre-bore through the upper material.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
RETAINING WALLS
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
We have the expertise and technology to ensure that ground movements are controlled and an economic solution is found.
The most common methods, secant and contiguous walls are discussed on this page. However further guidance and explanation of different techniques can be found in CIRIA guide C760, Guidance on embedded retaining wall design.
Secant walls
Secant piles are installed by overlapping reinforced male piles and female piles which are installed with a low strength gain concrete. They are adopted to restrict groundwater and fines inflow with retained heights of up to 8m common. Greater excavation depths may be achieved. However the geological and hydrological conditions need to be considered along with installation tolerances when determining the suitability of the application.
Contiguous walls
Contrary to their name, contiguous piles are actually installed with a gap of 100-200mm per pile. This means that the wall is not water or fines tight. However where the conditions allow, such as in cohesive soils, it can be the most economic form of retaining wall.
The choice of construction technique, CFA or Rotary, is dependent upon soil type but can range from 300-1200mm diameter.
This can provide retained heights of up to 15m with propping and 10m in a cantilever situation.
Sheet Piled Wall
The sheet pile wall is an earth retention and excavation support technique that retains soil using sheets made of steel with interlocking edges.
The connection between piles is ensured by a clutching system which is designed as a watertight joint.
The sheet piles have various shapes and they are consecutively installed using a vibratory hammer or by pressing.
It can be used both as temporary or permanent wall and it has the advantage that no arisings are produced and can be installed relatively quickly.
If only used for temporary condition, the sheet piles can be afterwards extracted and re-used.
The wall formed is relatively flexible and limited in depth by the capacity of the equipments use, the stiffness of the soil layers and the potential declutching in course-grained soils.
King Post Wall
The King Post or Soldier Piles is the most common technique for earth support. This type of wall uses steel column embedded into predrilled and filled boreholes with our CFA Rigs, followed by the insertion of wooden planks or precast concrete panels between the steel columns, as the excavation progresses.
It has the advantage of flexibility in regards to the shape and can be installed around obstructions. The installation process is quick and vibration free.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
CFA PILING
CFA PILING
Continuous Flight Auger Piling Techniques
Continuous flight auger piles are constructed by injecting concrete through the hollow stem of the auger, with the spoil being extracted in one continuous movement as the auger is withdrawn. After the pile head is cleared of debris steel reinforcement is submerged into the high slump concrete.
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.
Plant and Equipment
We offer an expanding fleet of CFA rigs from 5T to 65T. Pile sizes range from 300mm to 1200mm and up to 30m depth. To help us ensure pile integrity all rigs are fitted with computer monitoring systems which record pile dimensions, concrete pressures and volumes.
In addition to the piling rig, all machines will be supplied with concrete pumps and on larger sites concrete holding drums.
GEOTHERMAL PILING
The temperature differential between the ground and soil provides a means of heating or cooling buildings during the winter and summer months respectively.
ROTARY PILING
Rotary rigs create the pile bore by removing the soil in sections, approximately a metre deep, until the design depth has been reached. At this stage full depth reinforcement cages, steel sections or permanent casings can be easily installed prior to the placement of concrete.
MINI PILING
Central Piling has a variety of bored and driven piling rigs suitable for house extensions, basement construction and restricted access sites.
FURTHER TECHNIQUES
In addition to the piling works, we offer a variety of other products like anchors, grouting, piling platform installation and maintenance, ground beam and slab construction, aswell as spoil removal and pile trimming.
DRIVEN PILING
Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
RETAINING WALLS
We offer a variety of bored pile retaining walls when provision for temporary and permanent support for basement excavations is required.
CFA PILING
CFA piling is a particularly economical choice of piled foundation in sands, gravels and low grade rock as this process requires no casings or drilling fluids.