The trench width at the top of the pipe should not exceed the specification. (The specification must allow adequate room for shovel slicing the haunches.) An increase in the trench width may create an overload on the pipe.
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The foundation must be firm and unyielding before bedding placement. Keep water out of the trench bottom. Where the trench bottom is soft and unsuitable to support the pipe, bedding and backfill, removal and replacement of foundation material is necessary. Consult the design engineer or a geotechnical engineer to ensure the foundation can support the load.
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Dig bell or coupling holes before pipe is laid ensuring the bells or couplings support no part of the load.
| Step 4a | Step 4b |
|---|---|
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| Clean bell and spigot, including the O-Ring groove. Equalize the tension in the O-Ring by running a screwdriver or smooth tool completely around the spigot, under the O-Ring. | Lubricate both the spigot and the socket ends liberally to allow pipe to slide home. Make sure the gasket is in place by running your fingers completely around the assembled joint. |
When working in cold weather, it is recommended that O-Ring gaskets be stored inside vehicles or construction offices until they are needed to assure ease of installation.