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Foundation Tube Lengths 5 ft or 6 ft

Question
State NE
Description Text I have two lengths of Foundation tubes 5’ – from older NDOT plan & 6’ - from the recent Bullnose testing using thrie-beam.
Is the 5’ for w-beam still acceptable with the MASH approved loads?
Or should I switch to the 6’ only? 
Keywords
  • End Treatments & Crash Cushions
  • Guardrail
Other Keywords none
Date October 24, 2017


Response
Response

We have been using the 6’ foundation tube for use with the MGS due to the increased rail height affecting the loading of the anchorage during initial development of the system.

 

For the bullnose system, we would recommend similar length foundation tubes for anchoring a free end of the system. Note that the BCT posts adjacent to the nose of the system use 8’ long foundation tubes as only a single foundation tube is used for anchorage adjacent to the nose.

 

Thanks 

Date October 24, 2017


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