I want to what is height of instrument and Rise & fall method of levelling? What is the method to calculate reduced level.
Difference between granular sub-base and wet mix macadam in payment structure: The wet mix macadam mostly consists of laying spreading and compacting of clean, crushed, well-graded granular material that is prepared and approved granular sub-base. Single compacted wet mix macadam player shall not beRead more
Difference between granular sub-base and wet mix macadam in payment structure:
The wet mix macadam mostly consists of laying spreading and compacting of clean, crushed, well-graded granular material that is prepared and approved granular sub-base.
Single compacted wet mix macadam player shall not be less than 75mm.
Whenever we are using vibrating compacting equipment then compacted depth of a single layer of the course of the subway may be up to 200 mm.
Wet mix macadam shall be prepared in an approved of water macadam mixing plant.
Here replacing the aggregate fraction should be retained on 22.4 mm sieve with materials of passing from 22.4 and written on 4.75 mm.
While the addition of water, the evaporation loss shall be considered the mixed material shall be uniformly wet and segregation will take place.
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nikeetasharma
Height of Instrument : It is the method which deals with the obtaining of RL of the line of collimation by adding BS reading of a known RL point. Thus, RL of the line of collimation is called the Height of Instrument. It is always measured from the benchmark. Hence the benchmark is the point on theRead more
It is the method which deals with the obtaining of RL of the line of collimation by adding BS reading of a known RL point. Thus, RL of the line of collimation is called the Height of Instrument. It is always measured from the benchmark. Hence the benchmark is the point on the sea derived from mean sea level.
– method to calculate RL;
height of collimation (H of C) = reduced level(R.L.) + backsight (B.S.)
reduced level (R.L.) = height of collimation (H of C) – foresight (F.S.)
reduced level (R.L.) = height of collimation (H of C) – intermediate sight (I.S.)
It is the method which gives the difference of elevation between consecutive points by comparing each point after the first that immediately preceding it. Rise and fall are indicated by the difference in staff reading. After that RL is found by adding the rise to or subtracting the fall from the reduced level of the preceding point.
– method to calculate RL;
fall (F) = foresight (F.S.) – backsight (B.S.)
fall (F) = intermediate sight (I.S.) – backsight (B.S.)
rise (R) = backsight (B.S.) – foresight (F.S.)
reduced level (R.L.) = precede reduced level + rise (R)
reduced level (R.L.) = precede reduce level – fall (F)
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