⚠ May require more grout than anticipated: Difference between revisions
(Created page with "<div style= "text-align:center;">''Message: Sliplining perforated CMP can be problematic because grout may fill holes in embankment.''</div> ----</br> '''Lessons Learned:''' #If pipe has holes, consider replacement instead of slip lining. It can be difficult to estimate grout needs because voids adjacent to the conduit can fill with grout. #Grout mix and placement technique is very important. The grout must be flowable in order to properly seal the annular space. #Grout...") |
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''Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.'' | |||
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Revision as of 20:01, 15 September 2022
Lessons Learned:
- If pipe has holes, consider replacement instead of slip lining. It can be difficult to estimate grout needs because voids adjacent to the conduit can fill with grout.
- Grout mix and placement technique is very important. The grout must be flowable in order to properly seal the annular space.
- Grout is especially important with mechanical joints – more important than with a fusion welded joint.
- Low head dams might be more cost effective to replace than slipline.
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This central Montana dam had holes in the invert of the pipe. The pipe was sliplined with a mechanically joined HDPE pipe.
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This central Montana dam had holes in the invert of the pipe. The pipe was sliplined with a mechanically joined HDPE pipe.The grout take was significantly higher than the original quantity estimate – voids around the pipe were far worse than anticipated.
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This central Montana dam had holes in the invert of the pipe. The pipe was sliplined with a mechanically joined HDPE pipe.The grout take was significantly higher than the original quantity estimate – voids around the pipe were far worse than anticipated.It was difficult to get a good seal of annular space and to achieve the correct grout mix (due to winter conditions) – sand caused bridging in the annular space.
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Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.
Revision ID: 3166
Revision Date: 09/15/2022