Calculate The Quantity Of Bricks For Circular Manhole
Today In this article, I explain the manhole types of the manhole. Calculate The Quantity Of Bricks For the Circular Manhole.
Types of manhole
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Calculate The Quantity Of Bricks For Circular Manhole
The basic three types of manholes according to construction
Normal manhole
Shallow manhole
Deep manhole
Normal Manhole
The depth of this manhole is up to 1.5meter or 5 feet. Normally the shape of this manhole is rectangle or square. This manhole is used for drainage water lines.
Shallow Manhole
The depth of this manhole is up to 0.70meter to 0.90meter. this manhole is constructed is normally the starting point. This manhole is best for maintenance work.
Deep Manhole
The depth of this manhole is greater than the 1.5m.this manhole has always heavy cover and also has this manhole the enter and exit point.
Now we calculate the number of bricks for circular manhole
Example
Clearspan of manhole=3feet
Thickness of wall =13.5inch=13.5/12=1.125feet
Height of manhole wall=5feet
Inner diameter of manhole=d=3feet
Outer diameter of manhole=D=inner diameter + thickness of 2 wall
Outer diameter of manhole=3+2(1.1255)=5.25feet
Solution
Area of wall= πd²/4
Area of wall= π(D²-d²)/4
Area of wall= 3.14(5.25)²-(1.125)²/4
Area of wall=21.318ft²
Volume of wall =area x height
Volume of wall =21.318 x 5=106.59ft³
Volume of bricks= 0.75x 0.375×0.25=0.070ft³
Number of bricks= volume of wall /volume of one brick
Number of bricks= 106.59/0.070=1522.71=1523bricks
There are not the exact bricks. Because this is the circular wall so the thickness of the motor used in bricks is 0.0328ft
So the thickness of mortar will be added with the thickness of brick
So now the volume of wall =0.75×0.408×0.25=0.076ft³
Number of brick=volume of manhole wall/volume of a brick with mortar
Number of brick=106.59/0.076=1402.5=1403bricks
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