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Borehole extension measurement with continuous indication - using cable attached to extensometer tube and driving chart recorder pen
Borehole extension measurement with continuous indication - using cable attached to extensometer tube and driving chart recorder pen
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机译:具有连续指示的钻孔延伸测量-使用连接到引伸管和行驶记录仪记录笔的电缆
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摘要
An arrangement for continuous recording and display of the axial expansion of boreholes (1) and sections of boreholes is partic. applicable for mountain safety e.g in prediction of landslides. It uses some conventional components and has extensometer rods (3), tubes etc. arranged inside the boreholes. A cable (5) is attached at one end to the measurement rod (3) at a point inside the borehole and away from its mouth where the cable passes over a roller (4). The other end of the cable passes to a measurement arrangement (8) contg. a strip recorder (13). The strip recorder pen (12) is a worm shaft on a transfer shaft (10) forming part of a roller (11) carrying the cable (5) and tensioned by a spring motor. The measurement arrangement (8) is detachably mounted on a frame fixed to a solid base (22).
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