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Water tight pipe joints for significant hazard dam

Water tight pipe joints for significant hazard dam

Water tight pipe joints for significant hazard dam

For a significant hazard dam which has a 36" RCP meeting ASTM C-361  the contractor had already placed a concrete cradle which came up to the springline of the pipe before I discovered that there were a couple of joints that were not within the allowable tolerance for joint seperation. The two options are start over again at great expense to the Contractor or make the joints watertight.  My standard fix for low hazard dams was to pour an 18" wide collar around the joint from the cradle to one foot above the pipe and to pack the inside of the pipe joint with nonshrink hydrophilic grout.
Unfortunately, I am not dealing with a low hazard dam. Does anyone have a field proven repair to make sure I can maintain a watertight joint. The maximum head on the pipe will be 25 ft. I would prefer to be able to download a detail and report where this has been addressed previously.  Otherwise, the Contractor has to start all over again.  

RE: Water tight pipe joints for significant hazard dam

I would not recommend a different fix regardless of low or high hazard. It should be based on the water tightness of the repair. What kind of joints are they? If they are gasketed joints, how did they separate? If not, how are you preventing leakage? Are you constructing a filter diaphram? Neither the concrete cradle or the collar will prevent leakage if your joint leaks. How about lining the interior of the pipe with a PE liner?

RE: Water tight pipe joints for significant hazard dam


I recently worked on a project that replaced a few thousand feet of a larger RCP with WSP fittings. We encountered leaks at all of the new to existing pipe connections. A local water purveyor with similar and larger size distribution lines recommended the Weko-Seals. These were ordered and installed within 1-week. The cost was reasonable for our RUSH emergency.


RE: Water tight pipe joints for significant hazard dam

You might also check with the concrete pipe supplier for a recommendation.  We had a similar joint alignment issue in a small dam and the supplier recommended ConSeal CS-212 Joint Wrap (www.conseal.com) to provide the watertightness, then cover with grout to secure and protect the joint.

RE: Water tight pipe joints for significant hazard dam

They make 3-4 different inside joint repair sleeves. Go to trenchlessonline website and search around. Weko seal is one NPC makes one.  

Richard A. Cornelius, P.E.

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