Checkable single-walled ground protection pipe is provided close to its top edge with an annular disk which accommodates in its bore the lifting cylinder of an elevator unit

摘要

The checkable single-walled ground protection pipe (6) is provided close to its top edge with an annular disk (4) which has one or two hose connections (1, 2), and accommodates in its bore the lifting cylinder (5) of an elevator unit. The gap between the bore and the cylinder is filled with a plastic foam layer (9) supporting an elastic sealing compound (3).