Filter tube for lining spring facilitating insertion - connects to pressure source and forms its own injector

摘要

Filter tube has channels for injection, completely sepd. from the draining channel of the filter tube, the bottom end of which is closed. A source of pressurised water or air can be connected to the top of the filter tube, so that it can be rapidly inserted into the ground without an injector lance or a mantle tube. It is then only necessary to replace the compression by a suction connection. The tube is pref. a PVC extrusion inside the wall of which the injection channels are sepd. by solid zones with perforations opening to the bore of the tube. The number of operations normally required for the insertion of a filter tube into the ground to a level below the water table, is greatly reduced.