begraensning av lokala variationer i marknivaon vid dagvatten - och nedstigningsbrunnar

摘要

PCT No. PCT/SE82/00189 Sec. 371 Date Jan. 26, 1983 Sec. 102(e) Date Jan. 26, 1983 PCT Filed May 27, 1982 PCT Pub. No. WO82/04276 PCT Pub. Date Dec. 9, 1982.A tubular drain vertically positioned within the ground beneath the ground level in the vicinity of surface water and having a tubular drain cover-support member anchored in the surface ground layer with a tubular part of the drain cover-support means extending down into the tubular drain, so as to be axially movable relative thereto as a separately movable support element in annular disc form placed around the tubular part of the drain cover-support member so as to be axially movable relative to the drain while being guided by the upper part with it being anchored in the surrounding ground layer in a manner so as to be able to exert a downwardly pressing force from the underlying drain when relative movement is obtained between the drain and the supporting element.