Patent ID: 8483915

Claim:
Construction apparatus for foundation construction, comprising: a chassis, a mast adapted to guide at least one ground working apparatus, and a support mechanism for the mast, wherein the mast is arranged in an adjustable manner on the chassis, a positioning drive having a lower end and an upper end, the lower end is hingely connected to the chassis, the positioning drive is adapted to adjust the mast relative to the chassis, wherein the support mechanism has at least one support arm having a distal end pivotably hinged about a pivot axis on the chassis and another distal end coupled to the positioning drive and to the mast, the support mechanism has a further support arm which runs parallel to the first support arm, a rotary encoder disposed on the chassis and connected to the support arm to measure the pivot angle of the support arm relative to the chassis as a degree of an adjustment position of the mast, and a control unit adapted to control the positioning drive using the pivot angle measured by the rotary encoder and to counteract an excessive adjustment of the mast by the positioning drive.