This Method Statement provides detail procedure for the laying of concrete Kerb as per the approved drawing.
- Scope
This work consists of constructing cement concrete kerb in the central median and /or along the footpaths in conformity with the lines, levels and dimensions as specified in the drawings.
- Responsibility
Section In charge will be responsible for quality control of the section for the construction of Kerb. Further field engineers, surveyors, supervisors and lab technicians will assist him.
- Equipment
A continuous kerb casting equipment will be deployed capable of laying the kerb in required cross-sections and producing a well-compacted mass of concrete.
Where continuous casting with Equipment is not practicable, manual construction with suitable shutter will be done with the approval of the Engineer.
- Procedure
- Lines and levels will be marked and the sensor of the kerb-casting machine will be adjusted accordingly. Pegs will be put at every 10 meters interval indicating the levels. These pegs will be joined with a metal wire.
- The concrete of Grade M20 to be used for kerb will be produced at the batching plant as per the approved mix formula.
- The concrete will be loaded on to the transit mixer directly from the batching plant and transported to the kerb location.
- Kerb casting will be laid on firm foundation of minimum 150 mm thickness of cement concrete of M10 grade cast-in-situ and extending 50mm beyond the kerb stone or over WMM surface as per site condition.
- Before laying the foundation with lean concrete, the base will be leveled and lightly watered to make it damp.
- The cast – in – situ kerb will be constructed in all situations except at location where continuous casting with Equipment is not practicable, manual construction with suitable shutter with the approval of the Engineer.
- In the median portions in the straight reaches, the kerb will be cast in continuous lengths. In the portions where footpaths are provided and /or the slope of the carriageway is towards median gap/recess will be provided in the kerb by cutting to facilitate drainage openings.
- After laying the kerbs and just prior to 6 to 8 hours after laying of the concrete, saw cut grooves will be provided at 5m intervals or as specified by the engineer.
- Curing of kerb will be done by applying curing compound / or any other suitable method
- Vertical and horizontal tolerances with respect to true line and level will be + 6mm.
- Saw joint groove mechanically cut to 3mm to 5mm wide.
- Quality Control Testing and Acceptance
Quality control tests shall be done as per Quality Control Tests and Acceptance Criteria
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