An existing sewer at P is to be continued to Q and R on a falling gradient of 1 in 150 for plan distances of 27.12 m and 54.11 m consecutively, where the positions of P, Q and R are defined by wooden uprights. Given the following level observations, calculate the difference in level between the top of each upright and the position at which the top edge of each sight rail must be set at P, Q and R if a 2.5 m traveller is to be used. Level reading to staff on TBM on wall (RL 89.52 m) 0.39 m Level reading to staff on top of upright at P 0.16 m Level reading to staff on top of upright at Q 0.35 m Level reading to staff on top of upright at R 1.17 m Level reading to staff on invert of existing sewer at P 2.84 m. All readings were taken from the same instrument position
An existing sewer at P is to be continued to Q and R on a falling gradient of 1 in 150 for plan distances of 27.12 m and 54.11 m consecutively, where the positions of P, Q and R are defined by wooden uprights. Given the following level observations, calculate the difference in level between the top of each upright and the position at which the top edge of each sight rail must be set at P, Q and R if a 2.5 m traveller is to be used. Level reading to staff on TBM on wall (RL 89.52 m) 0.39 m Level reading to staff on top of upright at P 0.16 m Level reading to staff on top of upright at Q 0.35 m Level reading to staff on top of upright at R 1.17 m Level reading to staff on invert of existing sewer at P 2.84 m.
All readings were taken from the same instrument position
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