Avoiding pipeline failure
When laying a pipeline, avoid concrete pipeline failure by:
- eliminating bends, supporting horizontal and vertical pipelines to avoid extra loads on pipe clamps, securing 90° bends in pipes with legs clamped to ground
- securing vertical lines to the building and not to cranes, hoist towers, scaffolding and formwork
- checking all metal pipes and components with AS 2550.15 Cranes - Safe use - Concrete placing equipment (non-Queensland Government link)
- ensuring flexible hoses are not at risk of being run over by other plant and equipment on site.
More detailed information on concrete pipeline failure is outlined in Section 4.1.3 of the Concrete Pumping Code of Practice 2005.
When using quick release pipe clamps on fixed lines, make sure that:
- the pipe clamps used are able to maintain the maximum concrete pressure in the pipeline from the pump
- the locking pins are used and engaged
- pipe clamps with no provision for locking pins are not used
- all pipe clamps are regularly inspected and replaced if deformed or damaged
- clamps are locked according to manufacturer's instructions and not by hammering the quick release clamp lever or other methods causing metal fatigue.
For more detailed information on avoiding concrete pipe clamp failure, check Section 4.1.3 of the Concrete Pumping Code of Practice 2005.
When inserting anchor brackets on the concrete delivery pipe:
- anchor brackets and tie downs should be used at no more than 3 metre intervals on the concrete delivery pipe
- the number of bolts to secure an anchor bracket should be in accordance with AS 2550.1 : Cranes, hoists and winches - Safe use - General requirements (non-Queensland Government link)
- when using friction type drill-in anchors, these should be high-load slip, torque controlled type with a safety factor of 3 to 1
- chemical anchors are pull out load tested to 125% of their working load with a safety factor of 3 to 1 based on their failure load
- securing pipes overhead (i.e. so that the bracket anchors are loaded in pure tension) with through bolts that extend through the concrete slab rather than drill-in type anchors
- if drill-in type anchors are used overhead they should all be pull out load tested to 125% of their working load.
Where excessive pipe movement occurs in temporary laid lines due to surging action of the pump, use:
- extra anchorage methods to restrict line movement, especially at bends and elbows; or
- install a short wire-braided high pressure rubber hose between concrete pump and pipelines.
For more detailed information on anchor brackets and pipe movements, check Section 4.1.3 of the Concrete Pumping Code of Practice 2005.