How to Calculate Concrete Thrust Blocks

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Pipes are used to safely contain and transport materials from one point to another, particularly in the water and sewage venues. In order to move material through pipes, the pipes must be pressurized. It is possible for the sections of pipe to separate under the amount of pressure required to move materials through them. This separation can be avoided with the use of concrete thrust blocks, but you need to know exactly how much area the thrust blocks need to cover.

  • Determine the thrust value by multiplying the internal pressure by the square of the outside diameter by the mathematical value π (pi) by one quarter (0.25). The internal pressure should be measured in pounds per square inch (psi).

  • Divide the thrust by the allowable soil bearing capacity, measured in pounds per square feet. The allowable soil bearing capacity is a regulated standard charted by your local municipality. It varies depending on the kind of soil, sand or rock that the pipes travel through.

  • Multiply the quotient by 1.5. The result is the necessary area that your concrete thrust block must cover, measured in square feet.

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  • Photo Credit replacement of pipes image by Alina Goncharova from Fotolia.com
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