A sewer is to be laid at a uniform gradient of 1 in 200, between two points X and Y, 240m apart. The reduced level of the invert at the outfall X is 150.82. In order to fix sight rails at X and Y, readings are taken with a level in the following order: Reading Staff Station TBM (near X), RL 153.81 Top of sight rail at X Peg at X CP between X and Y BS 0.81 IS 'a IS 1.07 FS 0.55 BS 2.15 IS b FS 1.88 CP between X and Y Top of sight rail at Y Peg at Y (i) Draw up a level book and find the reduced levels of the pegs. (i) If a boning rod of length 3 m is to be used, find the level readings a and b. (iii) Find the height of the sight rails above the pegs at X and Y.
A sewer is to be laid at a uniform gradient of 1 in 200, between two points X and Y, 240m apart. The reduced level of the invert at the outfall X is 150.82. In order to fix sight rails at X and Y, readings are taken with a level in the following order: Reading Staff Station TBM (near X), RL 153.81 Top of sight rail at X Peg at X CP between X and Y BS 0.81 IS 'a IS 1.07 FS 0.55 BS 2.15 IS b FS 1.88 CP between X and Y Top of sight rail at Y Peg at Y (i) Draw up a level book and find the reduced levels of the pegs. (i) If a boning rod of length 3 m is to be used, find the level readings a and b. (iii) Find the height of the sight rails above the pegs at X and Y.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2 A sewer is to be laid at a uniform gradient of 1 in 200,
between two points Xand Y, 240 m apart. The reduced level
of the invert at the outfall X is 150.82. In order to fix sight
rails at X and Y, readings are taken with a level in the
following order:
Reading
Staff Station
BS 0.81
IS 'a'
IS 1.07
TBM (near X), RL 153.81
Top of sight rail at X
Peg at X
CP between X and Y
FS 0.55
BS 2.15 CP between X and Y
IS b
Top of sight rail at Y
Peg at Y
FS 1.88
(i) Draw up a level book and find the reduced levels of the
pegs.
(i) If a boning rod of length 3 m is to be used, find the level
readings a and b.
(iii) Find the height of the sight rails above the pegs at X and
Y.
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