A rotating laser is being used to control the casting of a concrete floor slab. The instrument is set up over a TBM that has a reduced level of 1299.234 mAOD and the projected plane is 1.534 m above this height. The base of the floor slab has a reduced level of 1296.734 mAOD and the slab must be 300 mm thick. What height on a levelling staff must the laser detector be mounted in order to ensure the slab is cast to the correct thickness (please state the value in metres and quote the value to three decimal places)?
A rotating laser is being used to control the casting of a concrete floor slab. The instrument is set up over a TBM that has a reduced level of 1299.234 mAOD and the projected plane is 1.534 m above this height. The base of the floor slab has a reduced level of 1296.734 mAOD and the slab must be 300 mm thick. What height on a levelling staff must the laser detector be mounted in order to ensure the slab is cast to the correct thickness (please state the value in metres and quote the value to three decimal places)?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A rotating laser is being used to control the casting of a concrete floor slab. The instrument is set up over a TBM that has a reduced level of
1299.234 mAOD
and the projected plane is
1.534 m
above this height. The base of the floor slab has a reduced level of
1296.734 mAOD
and the slab must be 300 mm thick. What height on a levelling staff must the laser detector be mounted in order to ensure the slab is cast to the correct thickness (please state the value in metres and quote the value to three decimal places)?
Transcribed Image Text:A rotating laser is being used to control the casting of a concrete floor slab. The instrument is set up
over a TBM that has a reduced level of 1299.234 m AOD and the projected plane is 1.534 m above
this height. The base of the floor slab has a reduced level of 1296.734 m AOD and the slab must be
300 mm thick. What height on a levelling staff must the laser detector be mounted in order to
ensure the slab is cast to the correct thickness (please state the value in metres and quote the value
to three decimal places)?
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