design of pile mat 2

[mhandisi]

would any one enlighten how you go about determining the thickness of crash concrete layer underlying existing subgrade to be used as the piling mat to support a piling rig.
what are the factors to be considerd
is there an softwere/program that is user friendly for solving these problem.

 

[BigH]

What is crash concrete?

 

[hokie66]

And how can it underly the existing subgrade?

 

[BigHarvey]

Design of working platform for rigs can be found on the site of the FPS (Federation of Piling Specialists ) in UK.

 

[mhandisi]

Thanks BigHarvey, you have been very helpfull.

 

[iandig]

There is also a BRE based upon the FPS, referenced as BR 470, this includes working platform design for cohesive and granular sub-grades with worked examples. Unfortunaltey the methodology for incorporating geo-grids into the granular layer is not quite up to speed but does give a good indication of the likley [i.e. minimum] reduction in thickness through the inclusion of geo-grid/s into the mat. From experience, each supplier of geo-grid has a different methodology for 'proving' their material and design, and often they will warrent the design if you buy their material.

 

[BigHarvey]

BR 470 is the document indicated on the FPS website. We are talking about the same document ! We have also one under preparation in France but it is not yet public. BR 470 is allowing calculation of loads induced by the rig for each working phase ( the french document is not very good for that ) but the geotech calculations are more straight forward in the future french document. They boyh give similar thickness for the platform.

 

[mhandisi]

Again guys, thanks very much. you have made my life a bit easier.