Piling and Retaining walls

Bearing Piles, Retaining walls & Installation methods

Bearing Piles

Bearing piles are used to transfer structural loads into the ground to a suitable soil stratum and limit structural movements. We have the capability to install piles with diameters from 200mm to 2500mm, and depths exceeding 50m using our fleet of mini-piling and full-scale piling rigs.

Our in-house design team has the expertise to design both geotechnical and structural elements, including pile caps and rafts. We can also design and install structural sections or plunge columns into the piles to facilitate top down construction or other temporary works. We also undertake the integrity and load testing of piles to ensure design performance and client specifications are met.

Bearing Piles

Bearing piles are used to transfer structural loads into the ground to a suitable soil stratum and limit structural movements. We have the capability to install piles with diameters from 200mm to 2500mm, and depths exceeding 50m using our fleet of mini-piling and full-scale piling rigs.

Our in-house design team has the expertise to design both geotechnical and structural elements, including pile caps and rafts. We can also design and install structural sections or plunge columns into the piles to facilitate top down construction or other temporary works. We also undertake the integrity and load testing of piles to ensure design performance and client specifications are met.

RETAINING WALLS 

Retaining walls are used to support the ground around excavations in many applications from building basements, to shafts for underground structures and transportation infrastructure such as bridge abutments and tunnel walls. We offer a variety of retaining wall types including contiguous walls, secant walls (hard-soft, hard-firm and hard-hard)and kingpost walls. Our in-house design team is able to analyse and optimise the structural and construction sequence requirements to meet our customer’s needs.

INSTALATION METHODS

We specialise in cast-in-situ concrete and grout piling. The methods described can be used to construct single bearing piles, pile groups or retaining walls. Using our expertise we can choose the optimum instalation method and piling rig to suit the ground conditions, pile diameter and depth, and the access and constraints of the site. We offer a range of installation techniques:

 

Rotary Bored piles are drilled using temporary outer casings to support upper unstable and water bearing soils. They are then drilled open hole to the pile design founding level. The drilling method involves incrementally adding augers, or repeated raising and lowering a drilling tool on a kelly bar, into the pile bore. Where the ground cannot be sealed with casings, or bored dry, then a temporary drilling fluid such as bentonite or polymer drilling aides are used. Upon completion of drilling the augers are removed, the pile bore is cleaned, a reinforcement cage is installed and the pile is concreted. The rotary bored piling method can be adapted using special casing shoes and drilling tools to bore through obstructions, such as existing piles, or boring through natural rocks.

 

Continuous Flight Auger (CFA) piles are drilled using a hollow stemmed single length of “continuous” flighted auger, that is drilled to the required depth normally in one pass. As the auger is rotated out of the ground, concrete is pumped through the hollow stem of the auger to fill the void created. Upon completion of the concreting a reinforcement cage is plunged into the concrete. The boring head on the auger can be modified to suit a range of soil and rock conditions. Larger rigs are fitted with instrumentation to monitor the pile construction and provide quality control records.

 

Segmental Flight Auger (SFA) piles are similar to the CFA method but the auger is added segmentally to achieve the design depth. It is often used to install piles in unstable soils where access is limited and only a mini piling rig can be deployed.

Solimec SR95

Our SR-95 rig can operate in rotary and CFA modes and is the extended mast version with wider tracks for stability, has remote tracking for loading/unloading and a dual auger cleaner to improve cleaning efficiency. In rotary (LDP) mode it can be fitted with a locking kelly bar to bore to depths of 70m at diameters ranging from 600mm to 1900mm. In CFA mode it can be configured in multiple configurations (4 line and 2 line) to meet site requirements. CFA bored lengths of up to 34m and diameters ranging from 350mm to 1200mm can be achieved.  The rig has a weight of about 100tonnes and has a Euro stage V engine.

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Super Kitten

This rig is ideally suited for extremely restricted sites. It has been designed to fit through a standard doorway of width 700mm. Capable of drilling case and auger piles up to 340/300mm diameter to depths of 23m and SFA piles up to 300mm diameter to depths of 12m.The power to weight ratio of this rig cannot be beaten.

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Klemm 702

The Klemm 702 is a restricted access rig which can produce excellent weight to pile diameter results. Capable of drilling 508/450mm case and auger piles to a depth of 26m and SFA piles to depths of 16m. With the ability to work remotely up to 50m from the power pack via umbilical hoses, the rig is an excellent choice for basement works, or working within existing buildings for floor or mezzanine upgrade works.

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Klemm 708

The Klemm 708 is ideal for tight access sites where umbilical hoses would cause a logistical issue. Capable of drilling 508/450mm case and auger piles to a depth of 26m and SFA piles to depths of 18m. At 10tonnes the rig is ideal for renovation works from an existing slab or minimally designed piling mats.

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Klemm 709-2 and 709-3

The Klemm 709-2 and the 709-3 are excellent mid-range rigs with respective weights of 13.5 and 18.5 tonnes.  Both rig types are capable of installing case and auger piles with diameters up to 660/600mm and to depths of 32m dependent on ground conditions. The 709 can also install SFA piles to diameters of 600mm overcoming the problem of operating a full size CFA rig on smaller sites or where restricted headroom exists.

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Solimec SR75

Our SR-75 Blue Tech model rig can operate in rotary and CFA modes and is the extended mast version with wider tracks for stability, has remote tracking for loading/unloading and dual auger cleaner to improve auger cleaning efficiency. In rotary (LDP) mode it can be fitted with a locking kelly bar to bore to depths of 70m at diameters ranging from 450mm to 1900mm. In CFA mode it can be configured in multiple configurations (4 line and 2 line) to meet site requirements. CFA bored lengths of up to 31m and diameters ranging from 350mm to 1200mm can be achieved.  The rig has a weight of about 80tonnes and has a Euro stage V engine

For more information & specifications
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