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Bored Pile
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Mini Pile
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Micro Pile
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Jet Grouting
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Soil Nailing
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Injection
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Stone Columns
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Compaction
Brief Explanation
about Bored Piles |
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Bored Piles |
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Bored Piles are circular piles made of concrete and steel being
installed in the soil by various drilling methods. They divert
high structural loads into deeper, stronger soils, form stringed
together a retaining wall for excavation pits or terraces remove
obstacles in the soil or block ground water below the surface.
Depending on the application length, diameter, material,
formation, and placing of the individual piles can be adapted.
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Bored Pile |
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Method
Kelly Method
With the Kelly method, uncased, partially cased, fully cased or
slurry piles are produced. The drilling tool is fixed to a
telescopic Kelly bar. It is drilled step by step into the soil. If
fully cased piles are produced, the casings are drilled to the
necessary depth and bored until the final depth is reached.
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Kelly Method with Bell-Out
Bell-out piles are based on the principle of a circular symmetric
extension of diameter at the bottom of the drill hole. The outer
load capacity of the pile is increased by enlarging the endbearing
area of the pile in the bearing soil layer. The bell-out size is
calculated according to structural needs and con-sidering the soil
below and the geometrical ultimate criteria.
Skin injection is an additional possibility to increase the load
capacity. Here, the skin friction of the pile is increased by
injecting cement slurry. |
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Stabilisation of terraces |
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Wind energy plant (bell-out pile) |
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Bored pile Front-of-Wall |
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Continuous Flight Auger
CFA is a drilling method which enables a high drilling performance
in stable soil. A continuous flight auger is used as drilling
tool. After having reached the final depth, concrete is injected
through the hollow stem auger. |
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Rotary Twin System
The Rotary Twin System is a combination of CFA with a continuous
drilling auger and the Kelly System with casing, which produces a
cased drilling according to DIN 4014 / EN 1536 with a con-tinuous
auger. |
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Front-of-Wall
The Front-of-Wall method results from the need to produce new
structures directly in front of existing buildings in city
centres. The production principle corresponds with the Rotary Twin
System, however, smaller diameters are used. |
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