What is Circular Wall | Estimation of O-Shape Wall Step-by-Step Guide | Circular Wall Volume Formula

What is circular wall

When a round room is to be prepared, or a well is to be built, a circular wall has to be constructed, called an O-shaped or circular wall. This wall is usually the inner or outer diameter, and its cross-section is known with the help of which its various quantities have to be determined. With the help of the given diameter, the middle diameter of the center line of the wall is found. 

The length of the circular wall is calculated using the formula "Ï€D."

If the wall cross-section is symmetrical, then the length of all the wall steps is the same.

If the cross-section is unsymmetrical, then the length of the wall is determined by finding the middle diameter of the center line of each step.

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Types of Circular Wall

  • circular retaining wall
  • circular Stone-wall

How to build a Circular Retaining Wall / Stone-retaining circular flower bed

A circular flower bed can be used to accent a tree or another area in your yard. Installing a circular retaining wall around your flower bed will add a touch of class to it. There are interlocking blocks with a radius built into them. They make an easy-to-install round wall.

Because you will not be using mortar to support the wall, expect the project to take a weekend or less.

THINGS YOU WILL REQUIRE

  1. Garden house
  2. Marking paint
  3. Shovel
  4. Rake
  5. Tamper
  6. River gravel
  7. Sand
  8. Interlocking retaining wall blocks
  9. Circular saw
  10. Masonry blade
  11. Dirt

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  • Put a circle of garden hose around the area you want to use for your flower bed. You can move it around until you like the size. Once you have the shape you like, use marking paint to trace around the hose to get the line on the ground.
  • Place blocks around the painted edge and draw a second line to show where the back edge of the retaining wall is. You'll have two paint circles on the ground when you're done. The Area between the circles needs to be dug up.
  • Take the Height you want your wall to be and multiply it by 1 1/2. Add 7 inches to the bottom for the footer.
  • Dig a ditch between the painted lines and as deep as the number of inches you figured out in step three. Put a shovel and a rake to use. Make sure the bottom is flat when you're done. Use a metal tamper to hit the dirt to make the ditch floor firm.
  • Fill the ditch 7 inches deep with river gravel, then use the tamper to pack the stone down. Put an inch of sand in the gutter, spread it out, and press it down.
  • Put the blocks that fit together end to end in the ditch to finish the first row.
  • Use a circular saw with a masonry blade to cut one block in half and then put it as the first block in the second row. Finish the row with blocks that are the same length. This will ensure no ends line up with the ends on the previous row. Do this for every other row you are putting in.
  • Install the rest of the rows by repeating steps 6 and 7, and fill the Area's middle with dirt to make a flower bed.

How to Build a circular Stone Wall

Stone retaining walls give a landscape definition and a change in texture. They also help with drainage and erosion problems. You can also build a stone retaining wall for tiered flower beds on a slope.

THINGS YOU WILL REQUIRE

  1. Wood posts
  2. String
  3. Tape measure
  4. Shovel
  5. Landscape fabric
  6. Gravel
  7. Hand tamper
  8. Crushed limestone
To use paver stones to build a retainer wall, you need to build a strong base for the wall and stack the stones, so the wall is stable. Once it's done, put a capstone on the top to protect it from the weather or frost.
  • Make a building plan for your wall by figuring out how tall it should be based on how big the site is. Put posts in the four corners of the site and wrap a string around them to make the wall outline.
  • Measure the size of the paver stones and dig a hole 6 inches deeper than the pavers. Plus, the length of the stone, the width should be 8 inches. If it gets cold where you live, dig the trench below the frost line to protect the wall from frost heaves.
  • Roll a strip of landscape fabric over the trench to improve drainage and keep weeds from growing underneath.
  • Pour 3 inches of gravel into the hole and use a hand tamper to pack it down. Pack and tamp down another 3 inches of gravel on top of the trench. On top of the tamped surface, add 2 inches of coarse sand or crushed limestone.
  • Put the paver stones in the trench, so they are right up against each other. Do this until the first row is done. Fill in the holes in the trench with crushed limestone or gravel to give the wall even more support.
  • Put the second course on top of the first. Use a half-stone at the end to stagger the joints and make the wall stronger. Keep adding courses until the wall is finished. Every other row should start and end with a half stone. After you complete each course, add a layer of topsoil to the back of the wall to make it stronger and help it drain.

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How to Calculate the volume of Circular/Round Wall


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Circular water Tank

Internal Diameter  = d = 11.5m

External Diameter = d = 12m

Thickness of Wall = w = 0.5m

Height of circular tank = H = 2m

Circular Wall Area Formula

The formula of Circular wallÏ€d²/4

External Area  = 3.14(12)²/4

External Area  133.11m²

Internal Diameter = 3.14(11.5)²/4

Internal Diameter = 103.88

To Find the Area of the Circular Wall

   External Area - Internal Area

            133.11-103.88

Area of Circular Wall = 9.23

Circular Wall Volume Formula


= 9.23m² x 2
                                    
Volume of Circular wall = 8.46m³

Example: Prepare an estimate of a circular wall or O-Shape Wall from the given data

1 . Excavation

2 . Concrete(1:4:8)

3 . D.P.C(1:2:4)

4 . Brick Work in Super Structure

5 . Cement

6 . White Wash

Diagram / Cross-Section

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Plan of a circular wall


The following steps are included in the computation process.:-

Calculation


Diameter among center line of wall = 10 + 0.75 = 10.75 ft

Length is taken as = πD = π x 10.75 = 33.77 ft

Given below is an exclusive table to simplify the calculation process :

1. Excavation work in ordinary soil = L x B x H = 33.77 x 2.5 x 1.25 = 105.53 cft

2.
Concrete work in foundation in the ratio 1:4:8 = L x B x H = 33.77 x 2.5 x 0.75 = 63.32 cft

3. Brickwork in the foundation & plinth

1st step = L x B x H = 33.77 x 1.5 x 0.5 = 25.33 cft

2nd step = L x B x H = 33.77 x 1.125 x 0.5 = 19.00 cft

Total = 25.33 + 19 = 44.33 cft

3. D.P.C or Damp Proof Course with thickness 2.5 cm in the ratio 1:2:4 = L x B = 33.77 x 0.75 = 25.33

4. Brickwork in superstructure = L x B x H = 33.77 x 0.75 x 3.00 = 75.98 cft

5. Cement Plaster is provided in the ratio (1:4)

Up to plinth level (2 numbers) = L x H = 33.77 x 0.5 = 31.77 cft

Over plinth level (2 numbers) = L x H = 33.77 x 3.0 = 202.62 cft
Civil Engineering Information

The creator Azib Rajput , is a civil engineer living in islamabad>> Punjab>> Pakistan . He has completed his DAE civil from CTTI. This site was made for educational purpose so as to help the fellow civil engineering students and to spread the knowledge about the latest civil engineering projects and softwares. This site consists of general notes of all engineering fields which are specifically taken from my class notes by considering various books and journals.

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