MEASURING VERTICAL MOVEMENTS IN SOIL BY MEANS OF A BELLOWS HOSE

BAELGSAETININGSMAETARE FOER MAETNING AV VERTIKAL-ROERELSER I JORD

The paper describes a method of measuring vertical movements in soil by means of a bellows hose inserted in the soil. The bellows hose is fabricated in lengths of 1 and 2 metres which are joined together with a brass coupling inside the tube. The hose is installed in the soil through a casing which has been pushed, hammered or drilled down depending on the soil stiffness. After the bellows hose has been lowered into the hole, the casing is withdrawn. In soft soils, the hole made by the casing will collapse and the soil will make good contact with the hose. In stiff soils, for instance dry crust, the space between the wall of the hole and the hose has to be filled with sand or thick drilling fluid, which will coagulate. When the adhesion between the bellows hose and the soil has been established, which usually happens within a week, the hose will follow the movements in the soil and the distance between the brass couplings can be measured. This is done by means of a device which is connected to a measuring tape which has a cable fastened to one side of it. Two circular springs on the device close the electrical circuit, which includes a battery, when the springs make contact with the brass coupling. The contact can be visually noted with a small lamp or galvanometer, or by means of a door bell buzzer. The measurements can be made with an accuracy of plus or minus 2 mm. Some typical results of settlement measurements from actual construction sites are shown in the paper. /TRRL/

  • Availability:
  • Supplemental Notes:
    • Norwegian Geotechnical Congress I, Trondheim, August 24-26, 1972.
  • Corporate Authors:

    Norwegian Geotechnical Institute

    P.O. Box 40 Tasen
    Oslo 8,   Norway 
  • Authors:
    • Wager, O
  • Publication Date: 1973-4

Language

  • Swedish

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00189514
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM