Illinois Administrative Code › Title 77 - PUBLIC HEALTH › Part 890 - ILLINOIS PLUMBING CODE › Subpart A - DEFINITIONS AND GENERAL PROVISIONS › Section 890.180 - Sewer and Water Pipe Installation

Current through Register Vol. 48, No. 28, July 12, 2024
a) Trenching and Bedding. Trenches shall be
				of sufficient width to permit proper installation of the pipe. If shoring is
				required, ample allowance shall be made in the width of the trench for working
				conditions, based on the materials and installation methods. If trenches are
				excavated to a depth so that the bottom of the trench forms the bed for the
				pipe, solid and continual bearing between joints shall be provided and bell
				holes shall be provided at points where the pipe is joined. If trenches are
				excavated to a depth so that the bottom of the trench does not form the bed for
				the pipe, the trench shall be backfilled to the grade of the pipe with sand or
				fine gravel placed in layers of 6 inches maximum depth and compacted after each
				placement. The pipe shall not be supported on blocks. If rock is encountered in
				trenching, it shall be removed to a point at least 3 inches below the grade
				line of the trench; the trench shall be backfilled to grade with the sand
				tamped in place to provide a uniform bearing for the pipe between joints. The
				pipe shall not be allowed to rest on rock at any point. If soft materials of
				poor bearing qualities are found at the bottom of the trench, stabilization
				shall be achieved by over-excavating at least 2 pipe diameters and refilling
				with fine gravel or sand or a concrete foundation. A concrete foundation shall
				be bedded and sand tamped in place to provide a uniform bearing for the pipe
				joints. All piping in the ground shall be laid on a firm bed for its entire
				length.
b) Backfilling. Trenches
				shall be backfilled until the crown of the pipe is covered by at least 18
				inches of tamped earth to ensure that the pipe beneath is secure. Loose earth
				that is free of rocks, broken concrete, frozen chunks or other rubble shall be
				carefully placed in the trench in 6 inch layers and tamped in place. The
				backfill under and beside the pipe shall be thoroughly compacted to ensure that
				the pipe is properly supported. Backfill shall be placed evenly on both sides
				of the pipe and tamped to retain proper alignment.
c) Breakage and Corrosion. Pipes passing
				under or through walls or floors shall be protected from breakage caused by
				stress or strain. Pipes passing under or through cinder, concrete or other
				corrosive material shall be protected from external corrosion, stress or strain
				by a protecting sleeve or a wrap-on material. (See Appendix B.Illustration
				AA.)
d) Sleeves. In exterior walls
				or floors, the annular space between sleeves and pipes shall be filled or
				tightly caulked with a cold tar, asphalt compound or other equally effective
				material. (See Appendix B.Illustration AA.)
e) Buried Piping Parallel to Footings. No
				buried piping shall be laid parallel to inside or outside footings, closer than
				18 inches to the footing. (See Appendix B.Illustration BB.)
f) Depth. Piping installed parallel to
				footings or bearing walls shall not extend below the 45 degree bearing plane of
				the wall or footing. (See Appendix B.Illustration BB.)