Measurement of Sewer and Water Main Renovation and Ancillary Works
Stabilisation involves the pointing and chemical grouting of joints.
Linings are of three types: essentially, type I uses the structural capacity of the existing sewer and requires a bond between the lining and the grout, and the grout and the existing structure; type Il is designed as a flexible pipe requiring no bond between the lining and the grout or the existing structure, and no long-term strength is assigned to the existing sewer; and type Ill provides permanent formwork for the grout, and the lining cannot be assumed to contribute to the long-term strength of the sewer. Linings are mainly formed of glass reinforced cement, glass reinforced plastic and resin concrete.
In situ gunite forms an effective structural coating.
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