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Water Services Trust Fund The Urban Projects Concept (UPC) Implementation Workshop

Water Services Trust Fund The Urban Projects Concept (UPC) Implementation Workshop Quality of Works. Why Emphasise Quality ?. To promote use of water in a hygienic environment For sustainability and durability For returns on investment Image of the WSP among the public.

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Water Services Trust Fund The Urban Projects Concept (UPC) Implementation Workshop

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  1. Water Services Trust Fund The Urban Projects Concept (UPC) Implementation Workshop Quality of Works

  2. Why Emphasise Quality? • To promote use of water in a hygienic environment • For sustainability and durability • For returns on investment • Image of the WSP among the public

  3. Lessons from the WSTF Pilot Projects Quality of construction works was largely affected by: Weak supervision Lack of adherence to technical specifications Sloppy and incompetent Contractors Theft of materials Varying site conditions

  4. Quality of works: Examples of “Don'ts” • Poor finishing • Evidence of poor concrete mix • Neglect of the water kiosk • Evidence that drawings • were not followed • No angle bars

  5. Examples of “Don'ts” (cont’d) • Incomplete work • Poorly done soak pit • Gulley trap is uncovered • Accumulation of solid waste • Unkempt surroundings • Uncovered; posing a hazard

  6. Examples of “Don'ts” (cont’d) • Poor concreting (ELDOWASS) • Short kicker bars (NZOWASCO)

  7. Examples of “Don'ts” (cont’d) • Unacceptable poor quality of columns (NZOWASCO) • Unacceptable result of using poor materials (NZOWASCO)

  8. Examples of “Don'ts” (cont’d) • Leakage • Wrong material usage • Poor quality improvising

  9. 0 Examples of “Don'ts (cont’d) • Poor plumbing • Prone to rain water • Lack of repair works

  10. Examples of “Don'ts” (cont’d) • Poor drainage around kiosk • Effect of leaking tank on roof slab

  11. How Do We Ensure Quality? • Following construction guidelines and the Toolkit • Drawings and specifications • Routine inspections • Testing and approval of materials • Ensuring safe and healthy environment

  12. Technical Specifications • Materials • Rejection of substandard materials • Examination of all materials arriving on site- should fit the specifications • Handling and storing materials with care • Codes of practice • Reference to be made to relevant codes of practice: (BS 8110, BS 5950, BS 6399, BS 4466 etc.)

  13. Technical Specifications (cont’d) • Drawings • All technical drawings to be accurately adhered to • A set of the drawings must be provided on site at all times • Setting Out • Works shall be set out accurately • WSP to establish and locate all benchmarks, lines, boundaries and/ or levels on the ground • The Site • Accessible; with secure storage for materials and plant • The works should not adversely interfere with the environment

  14. Technical Specifications (cont’d) • Concrete • Mix concrete in specified ratios at the site • Approved mechanical means of handling concrete are encouraged • Concrete should be placed in single operation to the full thickness of slabs and beams and similar members • Concrete in columns should be carefully placed and well vibrated • Work cube tests recommended

  15. Technical Specifications (cont’d) • Curing of Concrete • Protect concrete from premature drying by protection from wind, sun or rain by sheeting, or other approved means • Wet the concrete continuously for 14 days • Reinforcement • Fabrication, bending and fixing of reinforcement should be in accordance with standards • Shall be free from rust, grease or any substance likely to reduce the bond between steel and concrete

  16. Technical Specifications…cont’d • Finishes • Painting and other finishes to be carried out on clean surfaces • According to specifications • Fittings • High quality plumbing parts required; especially gate valves, bends and taps • Right class of pipes should be used

  17. Supervision of Labour • Competence • Workers on site should be experienced • Removal of incompetent labour • encouraged • Approval • Work done shall be subject • to approval by Engineer • Engineer to ensure that works • are complete before payment

  18. Supervision of Labour (cont’d) • Drawings • Workers should be able to • interpret all drawings • Safety & Health • Safety and health needs of • workers should be addressed • (e.g. each contractor should provide, safety instructions, helmets, safety boots & clothing!)

  19. Thank you!

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