JP2000352059A5

JP2000352059A5 -

Info

Publication number: JP2000352059A5
Application number: JP1999167037A
Authority: JP
Filing date: 1999-06-14
Publication date: 2006-06-01
Anticipated expiration: 2019-06-14

Description

続いて図２に示すように、この挿入孔３から削孔ロッド１を引き抜くのに伴って、少なくとも削孔ロッド１先端面と挿入孔３底面との間に、セメントペーストを主体とし且つ骨材を含まない高粘度グラウト材Ｇを順次注入充填する。図示例では、高粘度グラウト材Ｇを、削孔ロッド１内の図示しない圧送管路を介して削孔ビット１Ａの先端側に臨む図示しない吐出口から、削孔ビット１Ａの先端側挿入孔部分（以下置換部分ともいう）Ｓに対してグラウト材Ｇを注入させている。かくして、削孔ロッド１の占有空間をグラウト材Ｇにより置換し、その置換したグラウト材Ｇにより挿入孔３の孔壁を維持させる。図３は、グラウト材Ｇによる置換が完了し、挿入孔３全体（底から口元まで全体）にわたりグラウト材Ｇが充填されている状態を示している。しかし、本発明では、必ずしも挿入孔３の長手方向全体にグラウト材Ｇを充填しなくても良い。 Subsequently, as shown in FIG. 2, as the drilling rod 1 is pulled out from the insertion hole 3, at least between the tip surface of the drilling rod 1 and the bottom surface of the insertion hole 3, a cement paste is mainly used and an aggregate is used. High-viscosity grout material G that does not contain the above is sequentially injected and filled. In the illustrated example, the high-viscosity grout material G is inserted into the tip side insertion hole portion of the drilling bit 1A from a discharge port (not shown) facing the tip end side of the drilling bit 1A via a pumping pipe (not shown) in the drilling rod 1. The grout material G is injected into S (hereinafter, also referred to as a replacement portion). Thus, the occupied space of the drilling rod 1 is replaced by the grout material G, and the hole wall of the insertion hole 3 is maintained by the replaced grout material G. FIG. 3 shows a state in which the replacement with the grout material G is completed and the grout material G is filled over the entire insertion hole 3 (from the bottom to the mouth). However, in the present invention, it is not always necessary to fill the entire longitudinal direction of the insertion hole 3 with the grout material G.