Clay Pipe Installation Handbook

Chapter 8, Special Features

Fittings

Special attention should be given to compaction under the fitting spurs to avoid shear failure through backfill load. Where vertical risers cannot be avoided, special construction methods are required and should be evaluated by the design engineer. (Figure 27)

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Service Connections

The basic principles for constructing and inspectinc main line sewers should also be applied to the layinc of the service lines to each property (building sewers and building drains). These should be considered a part of the overall sewerage system and constructed with the same care as main line sewers. For information on tapping, contact local pipe manufacturers. ncpi029.GIF (8207 bytes)

Stoppers

In cases where fittings or stub outs will not be connect ed immediately, a suitable stopper with compatible jointing should be securely placed in the fitting. It further recommended that the stopper be external braced for additional restraint. This resists the tot force against the face of the stopper developed when air or water testing the sewer line.

Manholes

Manholes should be installed on an unyielding foundation. Settlement of the manhole can cause shearing of the pipe adjacent to the manhole. Short stubs with flexible compression joints or flexible rubber seals should be used in the manhole walls to allow minor differential settlement to occur without pipe shearing. (Figure 29)

NCPI - Clay Pipe Installation Handbook

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