Before placing rock pitching, the bank on which it is to be placed must be trimmed to a uniform slope as detailed on the drawings. Mortar base must first be placed commencing at the lowest point of the slope and placing must then progress upward. Depth of the base must be as indicated on the drawings. Protection works must consist of rock pitching adjacent to outlets and headwalls of drainage conduits and at intersections of open drains. Protection works must be carried out to the details indicated on the drawings.
On the day after the placement of the rocks, a stiff cement mortar mix must be carefully worked in to the joints between adjacent rocks to provide an even, solid, tight surface. The mortar mix and method to be used must be approved by the Superior. Rock pitching must be placed in the mortar whilst still wet, each rock being hand placed and firmly bedded into the mortar and against adjoining rocks. Rock pitching must proceed in a similar upward progression up the slope being covered, following the mortar base.
Open drains shall include table rains, catch drains and dispersal drains. All open drains shall be constructed to the levels and grades shown on the drawings. All open drains shall be cut to natural surface and shall not contain fill material unless otherwise directed by the Superintendent. Embedded steelwork included in the concrete structures such as open grating, support channels, manhole cover and the like shall be constructed to the details shown on the drawings and in compliance with the specification.
Additional dirt material must be placed on top of the cement stabilised dirt as required to obtain correct finished levels. This material must be as detailed on the drawings. Dirt must be placed equally each side of the pope to avoid disturbing the approved installed pipe conduit. Dirt must be placed equally each side of the culvert to avoid disturbing the approved installed box culvert. The depth of cement stabilised dirt above the top of the culvert must be as shown on the drawings.
On the day after the concreting of the rocks, a stiff concrete mortar mix will be carefully worked in to the joints between adjacent rocks to provide an even, solid, tight surface. Compaction will not be used within 150 mm of the pipe. Suitable backfill material will be placed around the pipe to a height of 300 mm above the top of the pipe or as detailed on the drawings. The remainder of the trench will be backfilled to finished ground level with material previously excavated from the trench.
On the day after the placement of the rocks, a stiff cement mortar mix must be carefully worked in to the joints between adjacent rocks to provide an even, solid, tight surface. The mortar mix and method to be used must be approved by the Superior. Rock pitching must be placed in the mortar whilst still wet, each rock being hand placed and firmly bedded into the mortar and against adjoining rocks. Rock pitching must proceed in a similar upward progression up the slope being covered, following the mortar base.
Open drains shall include table rains, catch drains and dispersal drains. All open drains shall be constructed to the levels and grades shown on the drawings. All open drains shall be cut to natural surface and shall not contain fill material unless otherwise directed by the Superintendent. Embedded steelwork included in the concrete structures such as open grating, support channels, manhole cover and the like shall be constructed to the details shown on the drawings and in compliance with the specification.
Additional dirt material must be placed on top of the cement stabilised dirt as required to obtain correct finished levels. This material must be as detailed on the drawings. Dirt must be placed equally each side of the pope to avoid disturbing the approved installed pipe conduit. Dirt must be placed equally each side of the culvert to avoid disturbing the approved installed box culvert. The depth of cement stabilised dirt above the top of the culvert must be as shown on the drawings.
On the day after the concreting of the rocks, a stiff concrete mortar mix will be carefully worked in to the joints between adjacent rocks to provide an even, solid, tight surface. Compaction will not be used within 150 mm of the pipe. Suitable backfill material will be placed around the pipe to a height of 300 mm above the top of the pipe or as detailed on the drawings. The remainder of the trench will be backfilled to finished ground level with material previously excavated from the trench.
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