| 摘要 |
<p>PURPOSE:To accurately measure water pressure distribution in the ground with the inside of a measuring hole multistagely water-blockaged by providing water pressure measuring tubes in a measuring tube body matching with depth at suitable intervals, and alternately fitting filter materials and sand bags between the intervals. CONSTITUTION:A measuring device A is composed by alternately fitting filters 2 and bag bodies to a measuring tube 1 formed with a tube body 1a and water pressure measuring tubes 1b, and a later pressure meter 4 is contained in a water pressure measuring tube 1b. Tube bodies 1a having a suitable length of each of them are connected to be the same length as the depth of a measuring hole, and the water pressure measuring tubes 1b, linked to a measuring instrument S on the ground via cords 9, are fitted at every measuring depth to coat their outer surfaces with filter materials 2. Then the measuring tube 1 is inserted in the measuring hole, the bag bodies 3 are filled with sealing materials 5 to be expanded, and the inside of the measuring hole is multistagely water-blockaded. This can measure the distribution of gap water pressure in the ground to be measured.</p> |
