I.P.S. Pressure/Irrigation (P.I.P) Installation Guide - JM Eagle

soil, which braces the thrust block, must be large enough to withstand the
thrust in whatever direction it is exerted.
Figure 15
3.9.5 Construction of Thrust Backing
1. Concrete thrust blocks are constructed by pouring concrete between
the fitting and the undisturbed bearing wall of the trench. A dry mixture
is prepared so that the concrete may be easily shaped into the
desired form, a wedge with the wide end against the solid wall. Note
the shapes and positions of the thrust blocks in the drawings.
2. Cinder blocks, wood, dry sand-cement mix or other materials may be
used for pipe sizes less than 6 inches provided that (a) there is sufficient
bearing area between backing and fitting, and (b) the backing
has sufficient strength to withstand the thrust load. If wood is used, it
must be treated to prevent deterioration.
3. As an alternative, mechanical thrust restrainers may be used to resist
the thrust developed.
3.10 Thrust-Restraint Joints
Various types of thrust-restraint joints are currently promoted for use with
PVC pipe. These include couplings, which require grooving the pipe, and
various fittings with set screws that bear on the pipe wall. These devices
can be uniformly recommended by JM Eagle for use with its products.
For installation follow the recommendation of the device manufacturer.
IRRIGATION & I.P.S. PRESSURE INSTALLATION GUIDE
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