The culvert pipe shall be of concrete/steel. The Engineer shall approve the type of concrete/steel culvert pipe rings and supplies. A sample culvert may be provided prior to the commencement of work for approval by the engineer. The culvert gradient including the outlet shall be minimum of 2%. Backfilling shall be down with the approved materials and compacting of layer not exceeding 15 cm loose. The ramp shall be shape to achieve a minimum over fill of 3/4of the pipe diameter. The disposal of the surplus material shall be done at locations approved by the Engineer. On the high traffic road, excavation of trench and lying of pipe ring shall be carried out in stage to allow vehicle to pass. Installation work has to start from the outlet side, adequate signs shall be provided. WORK METHOD: The Contractor shall apply Labour method of work for this item The work for item may be carried out consisting of the following activities. Supply concrete culvert pipe rings Excavated inlet and out with minimum 2% gradient-establish level, Shape culvert bed Place pipe rings and join them. Build head, wing wall and apron 4.5 and 4.6 as specified in the drawing Backfill and compact in layer not exceeding 15 cm loose Shape ramp over culvert. QUALITY CONTROL MEASUREMENT AND PAYMENT Payment: The Engineer will effect payment of completed culvert lines in the following payment certificate upon approval of the works. Bill 4: DRAINAGE WORK ITEM 4:4 Demolish existing structure and cart away debris
The culvert pipe shall be of concrete/steel. The Engineer shall approve the type of concrete/steel culvert pipe rings and supplies. A sample culvert may be provided prior to the commencement of work for approval by the engineer. The culvert gradient including the outlet shall be minimum of 2%. Backfilling shall be down with the approved materials and compacting of layer not exceeding 15 cm loose. The ramp shall be shape to achieve a minimum over fill of 3/4of the pipe diameter. The disposal of the surplus material shall be done at locations approved by the Engineer. On the high traffic road, excavation of trench and lying of pipe ring shall be carried out in stage to allow vehicle to pass. Installation work has to start from the outlet side, adequate signs shall be provided. WORK METHOD: The Contractor shall apply Labour method of work for this item The work for item may be carried out consisting of the following activities. Supply concrete culvert pipe rings Excavated inlet and out with minimum 2% gradient-establish level, Shape culvert bed Place pipe rings and join them. Build head, wing wall and apron 4.5 and 4.6 as specified in the drawing Backfill and compact in layer not exceeding 15 cm loose Shape ramp over culvert. QUALITY CONTROL MEASUREMENT AND PAYMENT Payment: The Engineer will effect payment of completed culvert lines in the following payment certificate upon approval of the works. Bill 4: DRAINAGE WORK ITEM 4:4 Demolish existing structure and cart away debris