Module 4 - Construction of a gravity fed system
Module 4 - Construction of a gravity fed system
Module 4 - Construction of a gravity fed system
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→ Circular tank<br />
- Horizontal reinforcement by sections <strong>of</strong> 1 meter starting from the top<br />
Wall thickness (cm)<br />
Diameter (m)<br />
10 cm<br />
1.5 - 2 m<br />
10 cm<br />
2 – 2.5 m<br />
10 cm<br />
2.5 - 3 m<br />
10 cm<br />
4.5 - 5 m<br />
10 cm<br />
6 m<br />
Height* (m)<br />
Diameter <strong>of</strong> irons used (mm) and mesh (cm)<br />
0 – 1 m Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 25<br />
1 – 2 m Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 15 Ø10 / 17.5<br />
2 – 3 m Ø8 / 15 Ø8 / 15 Ø10 / 12.5 Ø12 / 15<br />
3 – 4 m Ø8 / 15 Ø12 / 12.5 Ø12 / 10<br />
* by choosing a given height we can calculate easily the tank capacity:<br />
capacity = height x 3.14 x r 2 = height x 3.14 x diameter 2 / 4<br />
Standard examples <strong>of</strong> tank capacity are given to the following table:<br />
Capacity (m 3 ) 2 5 10 45 90<br />
Height (m) 1 1.45 1.7 2.65 3.25<br />
Diameter (m) 1.75 2.25 2.75 4.75 6<br />
- Vertical Reinforcement (distribution reinforcement)<br />
• Bottom <strong>of</strong> the tank to the middle height Ø8 / 10 cm<br />
• From middle height to the above <strong>of</strong> tank Ø8 / 20 cm<br />
In practice, you just have to stop one steel bar out <strong>of</strong> two starting from half way up.<br />
- Apron reinforcement<br />
Ø6 / 15 cm – square mesh or Ø8 / 30 cm – square mesh<br />
- Cover slab reinforcement<br />
Internal diameter <strong>of</strong> tank<br />
(m)<br />
Diameter <strong>of</strong> reinforced<br />
concrete (mm)<br />
Mesh<br />
(cm)<br />
2 m Ø 6 25 cm 8 cm<br />
3 m Ø 6 17 cm 8 cm<br />
4 m Ø 8 17 cm 10 cm<br />
5 m Ø 8 10 cm 10 cm<br />
6 m Ø 10 11 cm 10 cm<br />
Slab thickness<br />
(cm)<br />
17