INSTALLATION STRUCTURE FOR OBSERVATION HOLE OF PLUMB LINE AND INSTALLATION METHOD FOR OBSERVATION HOLE OF PLUMB LINE

摘要

PROBLEM TO BE SOLVED: To provide an installation structure for an observation hole of a plumb line capable of confirming that cement milk fills a gap between a boring hole and a lining pipe, and the filling has surely been performed even when the gap is extremely small.;SOLUTION: An observation hole of a plumb line includes: lining pipes 1a, 1b which are inserted into boring holes 10a, 10b; caulking materials 2a, 2b which seal a gap between the boring holes 10a, 10b and lower ends of the lining pipes 1a, 1b; hoses 3a, 3b, 4a, 4b for ensuring the filling of injected material, which penetrate the caulking materials 2a, 2b and are held by them; cement materials 5a, 5b which seal lower end sides of the caulking materials 2a, 2b. Injected materials 6a, 6b, which are injected from an upper end opening of the gap, leak from lower ends of the hoses 3a, 3b and 4a, 4b to audit corridors 7a, 7b. It can therefore be confirmed whether the injected materials 6a, 6b reach the vicinity of upper ends of the hoses 3a, 3b and 4a, 4b.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT