ASDSO Dam Safety Toolbox

Importance of a Dry Trench During Construction with Concrete Cradle

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Message: Concrete pipe support blocks can settle in a wet trench, causing pipe to misalign.

This Dam was rehabilitated by replacing the last section of pipe with RCP. The pipe was set on support blocks and bedded with high-slump concrete. The trench was not dewatered adequately, causing the pipe support blocks to sink under the weight of the 48-inch concrete pipe. As the pipe settled, joints became misaligned.

  • Trench after existing 48-inch CMP was removed.

    Trench after existing 48-inch CMP was removed.

  • Dewatering trench using a dewatering well.

    Dewatering trench using a dewatering well.

  • Setting pipe support blocks. Note water in trench.

    Setting pipe support blocks. Note water in trench.

  • Support blocks set.

    Support blocks set.

  • Beginning to set pipe.

    Beginning to set pipe.

  • Pipe support block listing under pipe weight.

    Pipe support block listing under pipe weight.

  • Note the difference in joint width between the top and bottom.

    Note the difference in joint width between the top and bottom.


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: 4716
Revision Date: 12/02/2022

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