Step 5: Preparation of Drawings, Specification and Bill of Quantities
- Preparation of Drawings: Project drawings shall show the proposed bridge in relation to the
existing features, and other information necessary for easy and accurate execution
of the design proposals in the field. All drawings shall have appropriate size,
scale and details.
- Specifications: The specifications to be followed in the engineering design phase
shall be the Standard Specification for Roads and Bridge Works and Special
Specifications specific to the bridge.
- Quantity Estimation: A Quantity estimation shall be
prepared following common practice for quantity surveying. Each item shall be
referred to the corresponding clauses of the standard and special
specifications.
Refer ▬►PWD
Part
II,Procedural Directives, Chapter 7 Engineering Design page 7-3, Example
attached RCSP, Sunkoshi Bridge Kurkhot
Step 1. Preparation of Terms of Reference for Engineering Design
The implementing agency shall normally employ consultants to prepare the engineering design
and supporting bidding documents, although design packages for smaller works may be
prepared by in-house engineering staff. In either case TOR shall be prepared for the
engineering design tasks and the following guidelines should be followed:
- The TOR shall clearly specify the objectives of the detailed engineering design. The scope of work normally includes elaboration of preliminary designs based on the actual field survey information, prescribed criteria and standards, further investigations, analysis of options and more realistic construction assumptions.
- A detailed design report shall be prepared containing drawings, specifications and the engineer’s cost estimate at a sufficient level of detail to allow the implementing agency may proceed with the procurement of works, goods and services for the implementation of the project.
- The TOR shall identify and describe surveys, investigations and studies to be completed for the alternative selected in the feasibility study.
- The TOR shall specify the engineer’s cost estimate to an engineering design level which should be accurate within ± 10% and based on realistic work norms, market prices, quotations and tendered unit rates.
- Any requirement for design optimisation for key project components should be clearly specified in the TOR.
- The governing design guidelines, standards and criteria should be clearly specified in the TOR.
Sunkoshi Bridge BoQ Blank