RW ARMSTRONG & SONS – CONHOLT PARK

When we were commissioned to conduct a CCTV drainage survey of this country estate in Andover we knew that, due to the age of the house, the drainage system may not follow modern industry standards which can prove for an interesting inspection. Using a pushrod camera system our initial investigations uncovered a series of sub-terranean tanks, buried manholes, blocked and damaged pipes.

Pipe repair can be expensive, intrusive and time-consuming however, after cleaning the pipes we were able to propose the non-intrusive, cost effective and efficient use of CIPP patch repair to the pipes. This is trenchless procedure to repair cracked pies by inserting an inflatable packer, coated in a resin and fiberglass mix, into an existing manhole and pushed through to the desired location. Once in situ the packer is inflated pinning the resin and fiberglass mix to the internal pipe walls. Once cured the pipe is left with a smooth. jointless patch in place.

We discovered a total of 8 underground tanks, each accessible from it’s own manhole. To discover if the tanks were still functioning, if they would effect any changes to the drainage system, and to understand their full capacity, we first emptied the water from them. To provide us with the full extent of information we needed, we applied use of Encompass Surveys being a multi-skilled organisation and utilised our 3D scanning and REVIT departments to produce models which enabled us to safely identify the parameters of the tank and locate and survey the pipework.

Unmanned Aerial Vehicles (UAV) present a modern solution to gathering large amounts and specific types of data on challenging and complex terrain. For this project we deployed the DJI M300 RTK with the Zenmuse P1 RGB, and utilising multiple ground control points and check points we were able to capture over 2500 images from the 15 acre site. The point cloud from the drone data and the sub-terranean tanks that had previously been scanned were then accurately merged allowing us to provide a full point cloud of the site with the hidden tanks
shown in their positions.

Finally, We had, at the customers request, also conducted A full utility survey of the site, from which technical drawings were produced detailing the exact location of the underground services such as telecoms, electric, gas, water and drainage. The 2D CAD linework. provided by the utility department, was then accurately overlaid onto the point cloud data to show where the hidden utility services were.

Conclusion – From receiving the initial request to conduct a CCTV drainage survey to producing a full site overview using drones, laser scanning, 3D modelling and the utility survey, we met and overcame all of the problems that arose with innovation. Due to the varied needs of the customer, we were able to apply our expertise from several departments within the company and provide appropriate solutions.