Services Offered

Mentor existing survey teams, offering strategic guidance, methodology development, implementation, refinement and task specific training (if required)

Perform independent survey audits for existing methodology, control networks and permanent survey records archive

Develop QA systems for all geometry control related data, including instrument calibration

Design Microsoft Excel spreadsheets to post-process set-out and as built survey data

Risk analysis for survey measurement error propagation, as pertaining to random, pseudo-random and systematic errors.

Review all methodology submission requirements from the general contractor, pertaining to field procedures for surveying, geometry control, QC inspection, QA documentation

Assist with methodology preparation / revisions – during the procedural approval process

Perform risk-assessment on existing methodology for fabrication / trial assembly, including weld heat induced deformation control and temporary support subsidence.

Offer suggestions for method improvement – to decrease potential errors, minimize costs and optimize fabrication schedule

Establish true ‘technology transfer’, for industry standard surveying techniques, including customized software for post-processing of raw field data, in-house periodic equipment calibration programs and optimized survey targeting devices

Review all methodology submissions from the general contractor, pertaining to field procedures for surveying, geometry control, QA documentation, fabrication

Perform risk assessment of proposed methodology, including error propagation

Review all set out survey data, prior to concrete placement or steel fabrication fit-up

Review all as-built survey data, including deflections and environmental data, to determine construction errors and corrective actions

Make periodic site visits to observe existing survey measurement practices and procedures

Establish realistic survey measurement tolerances for all components of the cable stayed pile caps, pylons, deck assemblies and cable anchorages. Based on estimates of survey measurement accuracy and standard deviations, derive fabrication tolerances for the permanent works structural steel and as-set tolerances for concrete shutter positional accuracy

Assist with preparation of the survey specifications for the tender document bid package

Help establish accuracy requirements for trial assembly of the deck / pylon components and identification / control of all environmental influences during as-set surveys

Establish minimum requirement guidelines for the Contractor's proposed geometrical control methodology, construction and survey measurement error identification and mitigation, including definitions of T₀, T₁ and T_∞ (reference) co-ordinate systems

Review various cable stayed span design proposals for constructability, analyzing schedule time against costs and the range of achievable accuracies against relative survey equipment capital expense.