trench sheeting work./ sheeting work./ preliminary demolition/clearance of a construction site for the construction of a new service building for the state office for schools - excavation pit shoring with secant bored piles all around, 50% reinforced, approx. 250 pieces in total, diameter 90cm / partly 120cm, individual length up to approx. 12-20m, incl. partial back anchoring (35 pieces). execution in 2 construction phases, with a time interval of approx. 6 months, in the inner city area.