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Boning Rods and site rails are traditionally made from timber, but there are reusable plastic ones on the market (called Cross-Bones). They are positioned on construction sites by the site engineer.

The site rails are positioned usually at the manhole point and the boning rod is used as a mobile indicator of the amount of excavation required to reach the pipe soffit. The rails are set at a uniform height above the manhole invert (say 3m) and the boning rod is made to the same depth. The pipe layer then uses the rails to eye in the boning rod to guide the machine driver so he doesn't excavate too deep or too shallow along the length of the pipe run.

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Q: How are drains set out using travellers boning rod and sight rails?
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