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トンネルの掘削に先立って、鋼管の内部に、先端部に削孔用ビットを備え、基端部が削岩機に接続される削孔ロッドを挿入して、切羽前方の地山を削孔しながら上記鋼管を打設した後、上記鋼管内から周囲の地山に地盤固化剤を注入して先受けする長尺先受工法において、上記鋼管の打設に先行して、上記鋼管の径よりも径の大きなガイド管を打設し、このガイド管内に長尺鋼管を挿入し、地山を削孔しながら上記長尺鋼管を地山内に挿入した後、上記削孔ロッドを回収して、上記長尺鋼管の内部から周囲の地山に地盤固化剤を注入するようにしたことを特徴とする長尺先受工法。
Prior to excavation of the tunnel, a drilling rod with a drilling bit at the tip and a base end connected to a rock drill is inserted inside the steel pipe to drill the ground in front of the face. However, in the long tip receiving method of injecting a ground solidifying agent into the surrounding ground from the inside of the steel pipe, after the steel pipe is placed, prior to the placing of the steel pipe, from the diameter of the steel pipe and Da設large guide tube diameter also insert the elongated steel pipe in the guide tube, after insertion of the long steel pipe to the earth Yamauchi while drilling the natural ground, was collected on SL drilling rod de A long tip receiving method characterized in that a ground solidifying agent is injected from the inside of the long steel pipe into the surrounding natural ground.
上記長尺鋼管を、上記鋼管の後端部が上記ガイド管内の先端部近傍にくるまで上記ガイド管内に挿入したことを特徴とする請求項１に記載の長尺先受工法。
2. The long tip receiving method according to claim 1, wherein the long steel pipe is inserted into the guide pipe until a rear end portion of the steel pipe comes close to a front end portion in the guide pipe.
上記長尺鋼管を地山内に挿入した後、上記長尺鋼管の後端部にダミー管を接続し、このダミー管にて上記長尺鋼管を押しながら、上記長尺鋼管の後端部が上記ガイド管内の所定の位置にくるまで上記長尺鋼管を上記ガイド管内に挿入し、しかる後に、上記削孔ロッドとダミー管とを回収するようにしたことを特徴とする請求項１または請求項２に記載の長尺先受工法。 After inserting the long steel pipe into the ground, a dummy pipe is connected to the rear end of the long steel pipe, and the long steel pipe is pushed by the dummy pipe while the rear end of the long steel pipe is 3. The long steel pipe is inserted into the guide pipe until it reaches a predetermined position in the guide pipe, and then the drilling rod and the dummy pipe are collected. The long tip receiving method described in 1.
上記削岩機が搭載されるガイドセルに、上記長尺鋼管を支持しながらスライドさせるスライド機構と上記長尺鋼管の支持部とガイドセルとの距離を伸縮させる手段を設けるとともに、上記ガイドセルを上下させる機構を設け、上記長尺鋼管をスライドさせて上記ガイド管内へ上記長尺鋼管を挿入した後、上記長尺鋼管の支持部とガイドセルとの距離を縮めながら上記ガイドセルを上昇させて、上記長尺鋼管内に配置された削孔ロッドと削岩機とを接続して、上記長尺鋼管を打設するようにしたことを特徴とする請求項１〜請求項３のいずれかに記載の長尺先受工法。
The guide cell on which the rock drill is mounted is provided with a slide mechanism that slides while supporting the long steel pipe, and a means for expanding and contracting the distance between the support portion of the long steel pipe and the guide cell. Provide a mechanism to move up and down, slide the long steel pipe and insert the long steel pipe into the guide pipe, and then raise the guide cell while reducing the distance between the support portion of the long steel pipe and the guide cell. , by connecting the drilling rod and rock drilling machine arranged in the long steel tube, to any one of claims 1 to 3, characterized in that so as to pouring the long steel tube The long tip receiving method described.
地盤固化剤の注入前に、上記長尺鋼管と上記ダミー管との接続部に注入用のダブルパッカーを挿入し、上記長尺鋼管と上記ダミー管との接続部に地盤固化剤を注入するようにしたことを特徴とする請求項１〜請求項４のいずれかに記載の長尺先受工法。
Before injecting the ground solidifying agent, insert a double packer for injection into the connecting portion between the long steel pipe and the dummy tube, and inject the ground solidifying agent into the connecting portion between the long steel pipe and the dummy tube. The long tip receiving method according to any one of claims 1 to 4 , wherein the long tip receiving method is provided.
上記ガイド管を樹脂製の管としたことを特徴とする請求項１〜請求項５のいずれかに記載の長尺先受工法。
The long tip receiving method according to any one of claims 1 to 5 , wherein the guide tube is a resin tube.
JP2004369742A2004-12-212004-12-21
Long tip receiving method
ActiveJP4322794B2
(en)