METHOD FOR EXECUTING EXPANSION-TYPE STEEL PIPE ROCK BOLT

PROBLEM TO BE SOLVED: To improve the durability of an expansion-type steel pipe rock bolt used for tunnel construction and to improve the shear proof stress of the expansion-type steel pipe rock bolt to a shearing force which occurs due to the deformation of the ground. SOLUTION: In this method for executing the expansion-type steel pipe rock bolt 4 of which both end parts are blocked and which comprises both a fluid injection opening A at one end part and a tubular shape capable of expanding in a drilled hole 2 in a rock mass R, etc., by pressurization from the fluid injection opening A, grout C is pressurized and injected from the fluid injection opening A to expand the steel pipe rock bolt 4 in the drilled hole 2, and the grout C is hardened with the steel pipe rock bolt 4 expanded in the drilled hole 2.