The DD-SF spherical support allows the installation of temporary and permanent ground anchors. The spherical cap rests on a support that transfers the force to the bulkhead, thus reducing the load transfer coefficient.

The DD-SF is made of nodular cast iron GJS-400-15 EN 1563

The DD-SF supports are designed for the installation of a transition tube by a thread located at the rear; this possibility guarantees boring continuity through bulkheads and supports.

The inclination is given by a spherical support that guarantees a self-aligning effect to the boring axis.