This standard gives recommendations for the static calculation of buried fibre-cement pressure pipes that are subject to external loads.
It is based on the principles of calculation of external pressures due to earth and superimposed loads acting on buried pipes, considering the soil and pipe relative stiffnesses and their mechanical interaction. Standard pipe-laying and bedding conditions are considered as detailed in EN 1444. In applying this standard, numerical values for the several parameters shall be selected. The pipe and soil parameters have been established empirically so that calculated results are in close agreement with actual measurements. However, since in practice the exact values of these parameters are seldom known, it is the responsibility of the design engineer to select the most appropriate values. The safety factors for pressure pipes are established for combined stresses due to internal and external pressures without reducing the values given in EN 512. The steps in choosing suitable pipes are : calculation of the total external load, including earth-load, superimposed vertical loads and water-load (see clause 5) ; selection of an appropriate bedding angle and the respective maximum ring-bending factor (see clause 6) ; determination of the safety factors against external and internal pressure when applied simultaneously. The pipes so chosen shall comply at least with the requirements of EN 512 (see clause 7).
NOTE The detailed procedure of choosing the necessary pipes is given in 8.
Registration number (WIID)
6938
Scope
This standard gives recommendations for the static calculation of buried fibre-cement pressure pipes that are subject to external loads.
It is based on the principles of calculation of external pressures due to earth and superimposed loads acting on buried pipes, considering the soil and pipe relative stiffnesses and their mechanical interaction. Standard pipe-laying and bedding conditions are considered as detailed in EN 1444. In applying this standard, numerical values for the several parameters shall be selected. The pipe and soil parameters have been established empirically so that calculated results are in close agreement with actual measurements. However, since in practice the exact values of these parameters are seldom known, it is the responsibility of the design engineer to select the most appropriate values. The safety factors for pressure pipes are established for combined stresses due to internal and external pressures without reducing the values given in EN 512. The steps in choosing suitable pipes are : calculation of the total external load, including earth-load, superimposed vertical loads and water-load (see clause 5) ; selection of an appropriate bedding angle and the respective maximum ring-bending factor (see clause 6) ; determination of the safety factors against external and internal pressure when applied simultaneously. The pipes so chosen shall comply at least with the requirements of EN 512 (see clause 7).
NOTE The detailed procedure of choosing the necessary pipes is given in 8.
