1.0 Introduction
Retaining walls to be constructed at the places where identified by the Engineer and this work shall consist of RR masonry retaining walls including all necessary components.
2.0 Abbreviation
SE – Site Engineer
TO – Technical Officer.
QAS – Quality Assurance System.
ME – Materials Engineer (Contractor).
TS – Technical Specification.
3.0 Resource Allocation
| Man Power | Equipment & Tools | Material |
| Site Engineer-01 | Track Back-hoe loader-01 | Cement |
| Surveyor-01 | Wheel Loader( If necessary) | Fine Aggregates |
| Survey helpers-04 | Water pump( If necessary) | Coarse Aggregates |
| Forman-01 | Dump trucks(15 tons)-02 | Steel |
| 2 Nos- Flagmen (minimum) | Mamoties | Random Rubble |
| Skilled labours-06 | Crow bars | Plywood sheets |
| Unskilled labours-05 | Shovels | |
| Operators-As required | Level instrument | |
| Porker vibrator | ||
| Safety boots | ||
| Safety Helmets | ||
| Safety Gloves | ||
| Traffic signs | ||
| Blinking Lights | ||
| Barricade boards | ||
| Traffic cones | ||
| Direction boards |
4.0 Quality Control Procedures
4.1 Material sampling and testing
The materials Engineer would take the samples from required materials such as concrete and soil according to the specified frequency and locations.
Concrete: in concrete, one set of cubes would be made per 10 cu.m of concrete. At least one sample would be taken on each day that a particular grade is used. Crushing strength of the concrete cubes would be tested for the samples at ages of 7 and 28 days. Each sample would be identified by identification No and it is displayed on the test cubes and a same identification No would be included in the sample register. The identification tag includes, the date of cast, age of test and date of test to be performed.
4.2 Inspection Check list
To ensure that the all activities being performed with the expected quality, an inspection check list would be filled by QAE or the respective QA inspectors in case of pre construction, during construction and post construction. The inspection check list shall include the specific requirements, safety and environmental measures.
4.3 Dimension Control
All specified lengths, widths and heights would be properly maintained during construction and all these dimensions would be checked with the inspection check list. In case of identifying the undesirable changes in specified dimensions and even beyond the specified tolerances, the particular work would be reworked before the subsequent work.
5.0 Methodology
Excavation
• Limits of the Excavation would be identified from the drawings and required levels and lines would be set out by the surveyor using pegs.
• Excavation would be carried out by wheel back-hoe loaders or any other suitable equipment up to the required levels and lines.
• The Engineer would be informed for inspection of foundation before preceding the subsequent work.
• All suitable material would be properly stock piled and other unsuitable material would be disposed to a suitable disposal location by tipper trucks.
• If the exposed surface is unsuitable for the construction of foundation, necessary excavation would be done for back filling with suitable material.
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