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Showing posts with label Construction Surveying. Show all posts
Showing posts with label Construction Surveying. Show all posts

Monday, December 3, 2018

Definition and benefits of column starter

This construction video tutorial provides detail information on column starter. You will learn the process for casting of starter as well as advantages of column starter.

Starter is generally a casting of concrete material with equivalent width and length of column section and comparatively smaller height of around 10 cm. It is cast in such a manner that equal cover is left encircling the reinforcement bars of column and then shuttering of column is provided. The main purpose of starter is to fine-tune the form work of a column vertically to maintain sufficient gap among column reinforcement and shuttering.

To retain the exact position of the columns in the below slab as well as retain the column lines in number of floors easily, starter is marked.

Given below, the major benefits of a starter :

a. It is easier to set up & check the center line of the starter as compared to that of the column.
b. With the existence of the starter is exact place, fixing the column becomes stronger. Sometimes, the column form work turns out to be skew. With starter, this issue is reduced completely.
d. Once the shuttering for column is completed, bracing or supports are settled ,the verticality is examined on two sides (adjacent faces ) with a plumb bob and alignment is examined through a cotton or nylon thread.

e. The column is casted as soon as all checks are finished with the certified concrete mix.
f. The column shuttering is eliminated next day and the curing should be started. Based on the climate (temperature and humidity ), the curing is performed either by spraying water at intermediate intermissions or covering column by hessian clothe to keep it wet.


To get more clear ideas, go through the following video tutorial.

Definition and benefits of column starter

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Published By
Rajib Dey
www.constructioncost.co
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Tuesday, June 26, 2018

Brief overview of rise and fall table in land surveying

This construction video tutorial is very useful for land surveyor. The tutorial sheds light on the rise and fall table in land surveying. Get some useful tricks to resolve the rise and fall table.

Rise and fall method is applied to resolve the levelling to detect the variation in elevation and elevation of points..


By resolving this table, it is possible to work out the reduced level of each point captured at staff rod with leveling machine. In order to work out the reduced level of an individual point, it is necessary to compute the rise and fall of points. After that, for reduced level, the following formula is applied :-

new R.L = old R.L – Fall
new R.L = old R.L + Rise


The table contains various heads like number, B.S (back sight), I.S (inter sight), F.S (fore sight), Rise, Fall, R.L (reduced level) and remarks.

B.S - Back sight (BS) is the abbreviation for "back sight reading". It means the first staff reading captured by the surveyor as soon as the levelling instrument is arranged and levelled. B.S is normally captured on the point of known reduced level as on the benchmark or a change point. The normally applied datum is mean sea level.

Fore sight (FS) is the abbreviation for "fore sight reading". It means the last staff reading captured prior to modify the instrument to the other position. It refers to the staff reading captured on point whose RL is to be ascertained. This sight is treated as negative and assumed from Height of Instrument to find out RL of the point.

Reduced Level (RL) in surveying stands for equating elevations of survey points relating to a common assumed datum. It refers to a vertical distance among survey point and selected datum plane. Therefore, it is taken as the base elevation that is applied as reference to consider heights or depths of other important places.

To get more detailed information, watch the following video tutorial.




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Published By
Rajib Dey
www.constructioncost.co
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