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Bored pile LARGE DIAMETER WITH ENLARGED BASE
concretesteelfoundation

bored pile
bored pile
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Characteristics

Type
bored
Material
concrete, steel
Applications
foundation
Other characteristics
pipe

Description

In stiff cohesive soils, bored piles can possibly be “under-reamed”: the belling technique may prove economical to take advantage of an enlarged pile base with increased end bearing capacity. Large diameter bored piles with an enlarged base or underream are also known as ‘bell out’ piles. Construction sequence The shape and the dimension of the base widening depend on the type of belling tool used: standard reamer or bucket reamer ‘bottom hinge’ which has a bell shape (a). Franki uses the 'top hinge' underreaming model (belling bucket) or standard reamer (b), usually cut at 45 or 60 degree angle, with the maximum diameter of the underream being not more than three times the diameter of the shaft, see figure on the right. Technical specifications • Shaft diameter from 1.080 to 1.500 mm • Enlarged base diameter (‘’bell’ diameters) from 1.700 to 2.700 mm • Concreting is carried out by means of the tremie pipe technique to avoid segregation of the concrete. • Full length reinforcement of the pile is possible • Execution possible with injection along the pile shaft • Installation of the pile up to 40 m deep • Potential construction of guide walls • Create piles with a cut off level beneath the working platform level (non-concreted length possible)
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.