SIMPLE MONITORING METHOD OF TUNNEL WORKING FACE AND MEASUREMENT DEVICE FOR HORIZONTAL MONITOR USED FOR THE METHOD

To provide a simple monitoring method of a tunnel working face which can grasp the behavior of a working face easily and at an early stage, and to provide a measurement device for horizontal monitor used for the method.SOLUTION: A simple monitoring method of a tunnel working face comprises steps of: (A) setting a measurement device 1 for horizontal monitor at a proper height level; (B) determining left and right both end positions of a working face 10 by a laser range finder of the measurement device 1 for horizontal monitor; (C) setting a plurality of measurement points P within the determined range of the working face 10; (D) repeatedly and continuously performing a step of irradiating the measurement points P with laser light L and measuring the distance from each measurement point P to an irradiation point; (E) performing the steps of (B) and (C) according to the excavation progress of the working face, and performing the step of (D) after re-setting the measurement point P; (F) and monitoring the extrusion amount of the working face based on the displacement of the measurement data in real time in the same measurement point in parallel to the step of (D).SELECTED DRAWING: Figure 2 【課題】切羽の挙動を簡易かつ早期に把握することが可能な、トンネル切羽の簡易監視方法と同方法に用いる水平監視用計測装置を提供する。【解決手段】（Ａ）水平監視用計測装置１を適正な高さレベルに設置する工程と、（Ｂ）水平監視用計測装置１のレーザー距離計により切羽１０の左右両端位置を判定する工程と、（Ｃ）判定した切羽１０の範囲内で複数の計測ポイントＰを設定する工程と、（Ｄ）前記計測ポイントＰにレーザー光Ｌを照射し、各計測ポイントＰの照射点までの距離を計測する工程を連続的に繰り返し行う工程と、（Ｅ）切羽の掘削進捗状況に応じて前記（Ｂ）、（Ｃ）の工程を行い、改めて前記計測ポイントＰを設定し直して前記（Ｄ）の工程を行う工程と、（Ｆ）前記各（Ｄ）の工程と並行して、同一の計測ポイントにおけるリアルタイムな計測データの変位に基づき切羽の押し出し量を監視する工程とから成る。【選択図】図２