| 摘要 |
PROBLEM TO BE SOLVED: To accurately and efficiently perform both construction in accordance with the properties of rock-beds, namely, the construction on a wall face to be digged by assembling a plurality of barlike timbering pieces constituted by curving shape steel like a circular arc into a ringlike timbering body if the wall face to be digged is stable and hard rock-bed and the construction of a wall face to be digged by assembling a plurality of facial timbering pieces like plane rectangular frame provided with stretched wire netting for preventing collapse like a ring if the wall face to be digged is loose rock-bed easy to collapse. SOLUTION: A first arm member provided with a gripping device of the facial timbering piece and a second arm member provided with a gripping device of the barlike timbering piece are connected with a turning body arranged in a tunnel excavator in series toward the back, and these gripping devices are provided with a turn prevention part for preventing the turn of the timbering piece in the direction of tunnel cross section and an oscillation prevention part for preventing its oscillation in the direction of tunnel length to assemble the timbering piece accurately and efficiently. The gripping device provided in the first arm member and the gripping device provided in the second arm member are separately used in accordance with the properties of the rock-beds.
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