PURPOSE: To easily construct an underground anchor in a boulder cumulative stratum, by a method wherein an inverted truncated pyramid form made of a very thin tinplate sheet is filled with gravel and boulder, and a quick curing cement solution is poured in the form to form a concrete body.
CONSTITUTION: An anchor consists of an inverted truncated pyramid form 1 made of a very thin tinplate sheet, which is corroded within a ground for dissipation, cross-shaped form plates 2 each of which crosses the outer surface of the bottom of the form 1 crosswise and has a bent part 4 along each of 4 side slopes of the form 1, collecting rods 3, each of which intercouples the form plate 2 and a collecting plate 5, a collecting plate 5, and a lift-up rod 7 which is coupled to the collecting plate by means of a coupling hole 6 of the collecting plate 5. A boulder cumulative stratum is excavated, the form body A is placed on the bottom of a excavated shaft, the interior of the form 1 is filled with gravel and boulder, and a quick curing cement solution is poured to form a concrete body 10. Further, the lift-up rod 7 is coupled to the collecting plate 5 to refill the excavated shaft.
WATANABE HIKOITSU
GENMA SANJI