CFA augers

CFA piles are bored piles made with a continuous auger. The set of augers is plunged into the ground with a rotary motion to the desired depth using a vertical drilling rig. Then, through the through-hole core of the augers, a concrete mix is introduced, which, under pressure, opens the outlet valve at the bottom of the auger. When lifting the auger, the drilled hole is tightly filled with concrete under pressure – which prevents the soil relaxation. After the entire hole is poured with concrete and the augers are removed, the previously made reinforcement is immediately inserted into the filled hole – creating a CFA pile. The advantage of this technology of making piles is its relatively low cost, short implementation time and ease of implementation while obtaining high parameters of the pile. Due to the vibration-free construction of piles, there are no contraindications for their construction in existing structures. CFA pile augers are usually made in typical diameters Ø300- Ø800. The augers sections are connected with pass-through joints and are usually ordered in lengths of 1m, 2m, 3m. At the end of the augers set there is a auger with an integrated cutting head. We are able to make other types and lengths of drills, on request.

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    What are CFA Piles?
    CFA Piles ( Continuous Flight Auger
    are bored piles, made with a continuous auger. It is the most popular
    method of execution of the so-called foundation piling.

    How are Piles CFA executed?
    The set of augers is driven into the ground to the desired depth with a rotary motion
    using a vertical drilling rig. Then, through the through-hole core of the augers, the concrete mix
    is introduced, which under pressure opens the outlet valve at the bottom of the auger.
    The previously prepared mixture is delivered by means of a pump to the side inlet
    of the auger or to the drilling rig itself – the so-called “”central concrete drilling rigs””. Along with
    the lifting of the auger, the drilled hole is tightly filled with concrete under pressure, which
    prevents the soil relaxation. Immediately after pouring the entire cavity with concrete and removing
    the augers, the previously made reinforcement is inserted into the filled hole, creating
    a CFA pile after cooling.
    In addition, central feed drilling rigs allow concrete to be injected without necessity
    to stop the auger rotation, as is the case when using a auger with a side
    feed system. Additionally, drilling rigs with central inflow do not require disconnecting the concrete feeding
    pipe during drilling and connecting it to the concreting operation each time.

    Where are the CFA piles used?
    CFA piles are used wherever there is a need to build bridges,
    CFA piles are used wherever there is a need to build bridges, buildings, acoustic screens or other structures on homogeneous
    soils, such as: plastic and hard-plastic clays, soft rocks, as well as sandy soils
    with an admixture of gravel and less cohesive soils such as, for example, clay and
    dust.

    What are the advantages of CFA Piles?
    The advantage of this technology of making piles is its relatively low cost, short implementation time
    and ease of implementation while obtaining high parameters of the pile.
    Due to the vibration-free construction of piles, there are no contraindications for their construction
    in existing structures.
    CFA pile augers are usually made by our Company in typical diameters Ø300- Ø800.
    The augers sections are connected with pass-through joints and are usually ordered in
    lengths of 1m, 2m, 3m or more. At the end of the augers set there is a auger with an integrated
    cutting head. We are able to make drills of various lengths and
    diameters, on request.

    Download the technical drawing