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Technical

The design of any buried pipe is dependent upon:
• Pipe stiffness
• Trench width
• Type of native ground
• Type and degree of compaction of bed and surround material

When the pipe is placed in the trench, sufficient working
space must be provided on either side of the pipe to ensure
adequate placing and compaction of the pipe surround
material. The following trench widths are given as a guide.
INTERNAL DIAMETER (mm)
MINIMUM TRENCH (m) WIDTH
BED THICKNESS (mm)
400 - 900
1.1 - 1.6
100
1050 -1650
2.1 - 2.8
150
1800 - 2200
3.2 - 3.7
150
2400 - 3000
3.9 - 4.5
200
Bedding and backfill
Flexible pipes require the support of the bedding and surround material to transfer dead and live loads to the native soil adjacent to the pipe.

This section provides guidance on the selection of materials
suitable for providing structural support to WEHOLITE pipes.
Materials which fulfil this role are termed bedding and
surround materials. The section deals both with imported
granular materials and materials excavated in the course of
the works (selected as dug) which are deemed suitable.
All WEHOLITE pipes require adequate structural support to
ensure their long term performance. The diagrams below
show two typical trench configurations and illustrates some of
the terminology adopted in pipe design.


 
Deep trench bedding and backfill detail
 
 
   
 
 
 
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