06/1168 - Change a Development Approval [As Published] · 132006.1168.02

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5.10 Manholes and Kerb Inlet/Gully Pits

Kerb inlet pits shall be built to accommodate pipes as shown on the drawings and standard drawings.
Concrete shall be Class N25. Manhole step irons shall be made to the pattern shown on the drawings.
After fabrication they shall be hot dip galvanised.

The joints between gullies/manholes and pipes shall be made watertight using cement mortar. The
mortar shail be used within one hour of mixing and shall not be retempered. The joints shall be finished
to provide smooth surfaces, uniform with the inner surfaces of the structure.

Concrete benching shall be shaped to the shapes specified and shall have smooth, even surfaces and
neat edges. Step irons shall be installed horizontal, vertically in line, and shall project uniformly from the
walls, where the depth of the structure is greater than 1.5m.

Where step irons are not cast-in-place, they shall be epoxy mortared into drilled holes. The joints
between the step irons and the walls shall be completely filled so that the step irons are held rigid and
the joints are watertight.

Manhole covers and frames shall be of the best grade cast iron, sound without twists and free from sand,
air holes, blisters, flaws or other defects to the dimensions shown on the drawings. They shall seat
evenly all around the frame without any tendency to pinch or pivot about a point.

Grates for pits shall be supplied and installed as shown on the drawings.

Temporary inlet pits shall be provided with adequate barriers to satisfy the Workplace Health and Safety
Act.

Concrete top slabs in Manholes shall be jointed to the walls using cement mortar or epoxy mortar. The
opening in the top slab shall be closed with temporary covers, after which excavations shall be backfilled.
Cast in situ concrete surrounds shall be constructed on the top slabs to encase the frames. Alternatively,
precast concrete surrounds may be employed, using epoxy mortared joints.

Temporary covers to Gullies and Manholes may remain in position and installation of the frames and
surrounds deferred until pavement construction has reached a stage where the frames and surrounds
can be positioned accurately. Where construction is in a staged format, the joint between each pour
shall be suitably roughened to ensure an adequate bind and seal is achieved between the successive
concrete pours.

§.10.1 Field Inlets

Field inlets of types scheduled shall be constructed to the details shown on the standard drawings.

Temporary inlet pits shall be provided with ‘childproof’ grates and adequate barrier fencing.
5.11 Headwalls, Wingwalls and Aprons

5.11.1 Precast Concrete Units

Precast concrete units shall be proprietary products manufactured by a recognised, quality assured

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