Underwater survey point installation method and underwater survey point indicator at low guard work

摘要

The present invention relates to an underwater measurement point indicator installation method and an underwater survey point indicator at the time of low maintenance work, and more particularly, to an underwater survey point indicator that indicates an installation position of an access block And an underwater measurement point indicator can be installed at an accurate position by instructing on the land so that a low-security work can be precisely constructed.;The method for installing an underwater survey point indicator at the time of low-security work is a method for installing a display at an underwater survey point in low-security work; The installation length from the vertically raised water surface of the water underwater measurement point A to the land measurement point B is calculated and the water measurement point B which displays the land measurement point B at the calculated measured point on the land A measurement and land survey point display step (first step); The length of the underwater measurement point indicator 100 is adjusted in accordance with the length of the vertically raised water surface of the water measurement point A and the length of the land measurement point B and then the land measurement point B (Step 2) of horizontally installing the measurement point indicator 100 such that the distal end of the measurement point indicator 100 coincides with the point on the vertically raised water surface of the underwater measurement point A ); A measurement point indication step (third step) for vertically lowering the weight 50 suspended from the tip of the measurement point indicator 100 into water to indicate an underwater measurement point; And a measurement point indicator installation step (fourth step) in which an indicator is provided on the bottom surface of the water indicated by the weight 50 to display the underwater measurement point A in the water.;In addition, the underwater survey point indicator may comprise an underwater survey point indicator for indicating an underwater survey point at the time of the low-security work; A main body 10 provided with a support rod 11 orthogonally below the distal end thereof and formed in a " T " shape and having a winder 12 on the distal end thereof; A base bar 20 which is fixed horizontally on the front side of the main body 10 and has a horizontal part 21 on the upper surface and a slide groove 22 in the longitudinal direction of the base part; A slide bar 30 provided with a wire inner roller 31 at its distal end and capable of adjusting the projecting and retreating position by means of a position fixing means 32 and provided forward and outward in a slide groove 22 of the base bar 20,; A height adjuster 40 provided below the main body 10 for vertically adjusting the height of the underwater measurement point indicator 100 by a screw; And a weight 50 hanging from the distal end of the wire 51 wound on the winder 12 and pointing to the underwater measurement point A.