The Project Highlights of 2024!
Infotec Surveys
Infotec has been providing solutions to the UK Underground Survey and Mapping sector for 30 years.
The notoriously problematic Crane Valley Sewer (Main Line) is one of the most difficult trunk sewers in London to survey successfully due to its continuously high and fast flowing nature. In this particular location, survey complexity was compounded by the number and nature of available access points. However, for the 2nd time, in recent years we managed to overcome the obstacles to deliver a completed survey for our client without the need for diversion or major isolation works. It remains one of our most difficult but rewarding surveys to date.
We were commissioned to undertake full Line, Level & Condition Surveys including Full In-Pipe LiDAR Scanning of the sections of 2362mm Low Level Sewer No. 1 (Main Line) and 1676 x 1067mm Grosvenor Ditch Sewer located within the vicinity of our client's site. Access was restricted by the limited number of available access points into the network in this vicinity, in addition to the impact of long term diversion works which had to be safely coordinated and managed with the Thames Water Trunk Planning, IAB and Project Teams. Through cooperation, collaboration and the deployment of remote long range survey solutions, the survey was successfully delivered for our clients.
Depth and distance were the primary challenges central to this particular survey, with chamber depths reaching close to 15m and traverse distances approaching 300m. Remote long range mapping and inspection solutions were planned and successfully deployed with the full cooperation of the client in order to manage on-site constraints and minimise access into adjacent Airport land. A full 3D Pointcloud of the internal pipe fabric was also produced to provide a true and accurate snapshot of the current condition and structural extent.
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This survey was both interesting and challenging in equal parts due to the complex interaction between numerous large diameter trunk and local sewers, incorporating tumbling bays, major diversions and significant silt/debris within certain sections. Coupled with a limited number of viable access points and the general nature of this central city location, it was essential to provide a bespoke solution that adequately dealt with the inherent constraints, whilst ensuring that the output level remained as comprehensive as we always strive for. A truly impressive and rewarding project in more ways than one.
The King Scholars Pond (KSP) Sewer, once the route of The River Tyburn (one of the major tributaries into the Thames and now incorporated into the Victorian Sewerage System pioneered by the renowned Sir Joseph Bazalgette) is always an honour and privilege to survey and appreciate with its impressive brick arch structure. We have been lucky enough to survey many sections of this impressive trunk sewer and it was imperative to provide detailed line, level and condition survey information for our client on this occasion to ensure that this asset remains protected as it weaves its way through a myriad of new development infrastructure within the centre of London.
The survey challenges presented on this project were quite unique in that the large diameter trunk sewers in question, the 3505mm Southern Outfall Sewer No. 2 - Arsenal Section and the 3505mm High Level Sewer No. 2 (Main Line) were subject to high flows, H2S gas issues, close proximity to Crossness Pumping Station and an inability to access manholes with survey vehicles due to the proximity of the structures beneath a raised sewer bank. This raised numerous logistical and operational challenges, however through bespoke adaptation of survey resource and a can do attitude, we were able to successfully accommodate all constraints to deliver for our clients once again.