Feeder tube to supply material for construction of vertical columns has vibrator acting in vertical direction, and curved two-part closure connected to lower tube end via joints

摘要

The device feeds concrete, mortar, etc. into displaceable grounds. It has a tube (1) with a wide section (3) above ground, a vibrator (2) to generate vibrations in parallel direction of the tube and transmit these into the wide section, and a feeder funnel (13) at the top. Air pipes extend from above ground to the lower end of the tube, where they have outlets. A closure flap (5) at the lower tube end has two pivoting parts connected via joints to the tube. The parts have curved surfaces, which when open are curved in the same direction as the inner tube wall. Before insertion of the tube, which is closed at the bottom, it is at least partially enclosed by a water-proof or water-permeable cover, of synthetic foil, nets, fabrics, etc. esp. geo-textile or geo-mesh.