To facilitate the following to the displacement of a bedrock and provide a stable anchor effect by inserting a plastic lock bolt having a specified elastic coefficient into an excavated hole formed on the bedrock, and injecting a resin fixing material.
A hollow pipe-like lock bolt 10 is inserted into an excavated hole 2 in a bedrock 1. After the insertion, a resin fixing material is injected into the hollow part of the lock bolt 10 through a hose 30. The resin fixing material flows out from the top end of the lock bolt 10 to fill and harden the inner part of the excavated hole 2, whereby it is integrated with the bedrock. As the lock bolt 10, an epoxy resin or polyester resin reinforced by glass fiber which has an elastic coefficient of 1,000,000 kgf/cm2 or less and 10,000 kgf/cm2 or more is used. As the resin fixing material, a silica resin mainly composed of urethane resin or alkali silicate aqueous solution, and isocyanate is preferably used.
SAMEZAWA HIROSHI
YAMADA TORU
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