specification for subdivision construction of road works and drainage
specification for subdivision construction of road works and drainage
specification for subdivision construction of road works and drainage
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D9<br />
MANHOLES AND GULLY PITS<br />
Manholes <strong>and</strong> gully pits shall be constructed <strong>of</strong> rein<strong>for</strong>ced concrete segments, at the locations <strong>and</strong> to<br />
the detail shown on the drawings.<br />
Top <strong>of</strong> manholes <strong>and</strong> gully pits shall finish flush with the final level <strong>of</strong> the surrounding ground,<br />
footpath, <strong>road</strong> or kerb.<br />
All covers shall be aligned to be parallel to the adjacent kerb, <strong>road</strong> or path.<br />
Step irons shall be installed to the Controlling Authority requirements.<br />
D10<br />
FILL AGAINST STRUCTURES<br />
Filling shall not be placed against structures until the structure has been inspected <strong>and</strong> approved <strong>for</strong><br />
filling.<br />
Fill materials shall be placed in horizontal uni<strong>for</strong>m layers not exceeding 150mm thickness <strong>and</strong> shall be<br />
compacted to a minimum dry density ratio <strong>of</strong> 98% when tested in accordance with AS1289 E2.1 or<br />
E3.3.<br />
Backfilling over <strong>and</strong> around structures shall avoid unbalanced loading or create movement.<br />
The Contractor shall be responsible <strong>for</strong> any damage to existing structures as a result <strong>of</strong> filling <strong>and</strong><br />
compacting operations.<br />
D11<br />
OPEN DRAINS, BASINS AND BERMS<br />
Open drains, basins <strong>and</strong> berms shall be constructed at the locations <strong>and</strong> to the details shown on the<br />
drawings at the earthwork stage.<br />
All batters shall be trimmed prior to stabilization. Batters steeper than 1 in 8 shall be treated with soil<br />
stabilizer, proprietary geotextile or stone revetment.<br />
Open drains having a grade greater than 1 in 1000 shall have stone scour prevention structures<br />
constructed at even intervals to achieve the maximum permitted grade.<br />
Inlet <strong>and</strong> outlet scour protection shall be constructed at the locations shown on the drawings using<br />
mortared stone pitching.<br />
Stones shall be hard, durable local stone spalls weighing generally in excess <strong>of</strong> 5kg each with the<br />
greatest dimensions not exceeding 1.5 times the least dimension. Stones shall be set on a prepared<br />
soil bed in a close fitting pattern <strong>and</strong> rammed into position.<br />
Joints shall be raked <strong>for</strong> their full depth <strong>and</strong> grouted with cement mortar.<br />
D12<br />
SUBSOIL DRAINS<br />
Subsoil drains shall be installed in the locations shown on the drawings.<br />
Subsoil drains shall consist <strong>of</strong> slotted pipes or strip drain fitted with a ge<strong>of</strong>abric filter sock <strong>and</strong><br />
screened by graded aggregate.<br />
Specification <strong>for</strong> Subdivision Construction <strong>of</strong> Road Works <strong>and</strong> Drainage<br />
Rev. 1 – February 2013<br />
21
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