# Calculate The Bricks For Circular Manhole

**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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