The ground anchor and its application manner and uses the same anchor the natural ground excavation construction method

摘要

PURPOSE: To securely support an underground structure before the ground is excavated. ;CONSTITUTION: A first anchor body is formed at the front end of an inserted tendon 10 in an anchor hole by use of a tensile steel bar as a core material to anchor in advance the front end of tensile steel bar in the ground and make the first anchored part 20. A sheath 12 is provided so as to cover the tensile steel bar 11 therewith in order to use a specified range of length from the first anchored part 20 as a free anchor part. And a sheath 13 is installed at the anchor hole opening side with a specified distance from the sheath 12. The tensile steel bar 11 between the sheaths 12, 13 is used as a core material to form the second anchor body. In this second anchor body, the second anchored part 22 is provided as the anchorage end in the ground to support an applied tension within the tensile steel bar when a specified tension acts on the tensile steel bar 11.;COPYRIGHT: (C)1996,JPO