Our survey skills can be applied at all stages of a construction project and across all types of construction. Individual sector types are detailed on other pages of our website (eg highways, railways, buildings), so here we want to emphasise our involvement across the full lifecycle of a construction project.
Planning – Topographical survey plans are of course needed for the design work, but in addition we can provide laser scan data of the structure’s surroundings to enable visualisation for the planners and public. The initial design can be modelled and placed within a 3D model for viewing from all angles. The new work can even be seen using VR – Virtual Reality. If the surroundings are captured (by ground based scanning or aerial lidar or photogrammetric methods) then additional analyses can be undertaken such as right to light, noise studies, the effects of wind tunnelling and monitoring of movements during construction.
Feasability -Some major projects split the survey tasks in to ‘feasibility’ and then design. The idea being to keep costs low before the final project go-ahead is given. However it is often the case nowadays, using modern scanning methods or lidar that we can capture data suitable for both feasibility and final design at one stage with minimal cost differences.
Detailed design – As mentioned above clients may choose to gather the survey data in one commission. However if considerable time has passed since the feasibility survey then an update can often be required to ensure no changes have taken place on the site or surroundings. It is important to ensure there is some permanent survey control on site to be available to the contractors. Merrett Survey Ltd are experts in installing and surveying high precision survey control networks.
During construction – The design drawings should use the same coordinate system and hight datum, as was used for the site survey, but this may not always be the case. In which case expert surveyors need to do some transformation work to ensure the engineer or architects plans are set out correctly on site. Progress meaurement can be undertaken by updating the BIM model from ground based scanning, or overall site monitoring using UAV / drone imagery. Rapid 360 imagery can also be provided on a regular basis to enable ‘immersive’ views of the progress of the project.
As built survey – On completion, as-built surveys are often commissioned to prove that the structure / building / plant has been built to spec, to see that it matches the design drawings and to act as base plans and models (often as BIM models nowadays) for the future management and maintenance of the asset. This is often very advisable for mapping and modelling the utility services installed – the HVAC – Heating, Ventilation and Air Conditioning ducts and cables plus drainage. Plus MEP – Mechanical, Electrical and Plumbing services. It is often the case that they are not always installed precisely where planned !
Maintenance FM ( Facilities Management ) – The building or structure that has been constructed will need to be maintained and having accurate as-built survey data ensures efficient management. It makes any modifications to the structure much safer and easier and of course doing this via the BIM model is becoming increasingly the chosen method.
Demolition – Yes this is the opposite of construction, but surveyors can be called in to make rapid BIM models of large buildings so that the demolition can be planned safely and economically. What are the floor thicknesses ? Can they bear the weight of demolition machinery / plant ? What are the overall quantities / volume of concrete, number of steel columns and beams ?