São estacas moldadas in loco, executadas por sistema rotativo ou por cravação de tubos metálicos perdidos. No caso de matacão/rocha, é executada utilizando o tubo metálico como revestimento recuperável por sistema de rotopercussão. A estaca é armada e injetada com calda de cimento (por meio de tubo manchetado) ou argamassa, visando aumentar a resistência do atrito lateral.
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