Securing lightweight plastic pipes against moving out of position

Securing the pipes using rods and tensioning straps

Due to the low weight of plastic pipes, shifting of the pipe axis can occur when the side fill is added. To prevent this, the pipes must be secured both horizontally and vertically.

  • Place rods to the left and the right of the pipe to hold the pipe in place horizontally.
  • Use tensioning straps or weights to maintain the position of the pipe vertically.

Creating the upper bedding layer

Verfuellen
  • Raise the lower edge of the shoring to the installation height.
  • Use backfill material and layer thickness as specified by the construction manager/foreperson.
  • Be sure the backfill material is free of stones and foreign substances/objects (e.g. wood, waste, topsoil).

Creating the upper bedding layer

Verdichtung mit Handstampfer im Zwickelbereich
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Install backfill material on either side of the pipe across the width of the working area and over the length of the trench section, and then distribute it evenly.

Key

  • 1 Upper bedding layer – haunch area beneath pipe
  • 2 Upper bedding layer – area to the sides of pipe
  • 3 Lower bedding layer
  • 4 Base of pipe
  • In the haunch area 1, insert the backfill material under the pipe by hand and compact it according to the instructions of the construction manager/foreperson.
  • Suitable equipment must be used to compact the backfill material in the haunch area beneath the pipe, according to the instructions of the foreperson – e.g. bending bar, hydraulic spade, tamper.
  • The compaction of the haunch area (upper bedding layer) must be at least as good as the compaction of the lower bedding layer. .
Biegeweiche Rohre

Creating the upper bedding layer

35 - Obere Bettung Verdichten
  • Install backfill material on either side of the pipe across the width of the working area and over the length of the trench section, and then distribute it evenly.
  • The areas on both sides of the pipe (upper bedding layer) must be built up and compacted evenly.
  • After the compaction of the haunch area, compact the upper bedding layer on both sides of the pipe using a lightweight compacting device (as specified by the foreperson).
  • Compact the backfill material in multiple passes, with the force directed towards the in-situ soil of the trench wall.
  • For plastic pipes, the upper bedding layer reaches to the middle (widest point) of the pipe. This is equivalent to a support angle of 180 degrees.
  • Ensure that the upper bedding layer and the compaction in the haunch area are at the correct height.

Creating the upper bedding layer

Creating the upper bedding layer / compacting the haunch area

Suitable equipment must be used to compact the haunch area (bending bar, hydraulic spade, tamper, etc.).

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