Mechanical Engineering, bridge bearings, structural engineering Specialists In Structural Movement Control

Ekspan were instructed to replace bearing stools assemblies on the low head high pressure pipeline for plinths 2, 4 and 6. Prior to commencement of this project, Ekspan had to carry out exploratory works to assess the pipe at all three proposed plinth locations for ovality and to take core samples of the footings directly below the pipe at the proposed areas for the foundations. Pre-works operations involved establishment of site compound with welfare and storage units, and temporary scaffold platforms for access to the pipeline with plant, labour and materials.

To accommodate the extreme incline of the low head pipeline location, which measures an angle of approximately of 42o, Ekspan had to develop a winch system. This, with the use of a tele-handler, enabled bearing/ stool assemblies, which were secured together with heavy duty chains and ratchet strops, to be carried and unloaded into the material skids. The skid and winch system was also used to lower the stool half to each plinth location temporarily secured in position on the scaffolding frame. Excavation works was carried to the existing concrete slab below the pipe, followed by the installation of 3 new concrete bases. Jacking stools, shot blasting, NDT and UT testing, and final application of a paint system were also carried out.

The remote location and the extremity of the low head pipeline incline made this project one of the most challenging to contend with, especially from a health and safety point of view, as did the weather conditions, the uneven terrain and
working in spaces with very limited access. The pipeline location is also within a National Park site and therefore all stages of operations were subject to approval and planning was key to get all stages of the project completed on time.