Pregunta
- 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
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
and R if a 2.5 m traveller is to
be used. Level reading to staff on TBM on wall (RL 89.52 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.
for plan distances of 27.12 m and 54.11 m consecutively, where the positions of
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
be used. Level reading to staff on TBM on wall (RL 89.52 m
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.
Ask by Knight Bryant. in China
Dec 08,2024
Solución de inteligencia artificial de Upstudy
Respuesta verificada por el tutor
Responder
The difference in level between the top of each upright and the sight rail at P is -0.34 m, at Q is -0.3308 m, and at R is 0.12847 m.
Solución

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Respondido por UpStudy AI y revisado por un tutor profesional
Como
Mind Expander
To calculate the difference in level between the top of each upright and where the top edge of the sight rail must be set, you first need to determine the reduced levels (RLs) for each position. For this, you can subtract the level readings from the RL of the TBM at P, which is 89.52 m. For example, at upright P:
RL at P = 89.52 m - 0.16 m (staff reading) = 89.36 m. Similarly, do this computation for Q and R using their respective readings.
Now, regarding the settings for the sight rail at each upright, we must account for the designed gradient. Since the sewer has a gradient of 1 in 150, calculate the necessary fall from P to Q and P to R. For instance, the fall from P to Q over a distance of 27.12 m at a 1 in 150 gradient gives a total fall of approximately 0.18 m, which alters the RL at Q. Don’t forget to take the 2.5 m traveler height into account when calibrating where to set the sight rail!
By accurately calculating these factors, you’ll ensure precise leveling for the sewer continuation and avoid any future complications!

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