Contractors World
 

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Contractors World - 2014 Vol 4 No 5

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Prefab Units Speed Up

Glasgow Environmental Programme

Contractor, George Leslie Ltd, installing precast combined sewer overflow panel system supplied by Kijlstra for the Glasgow Environment programme to reduce the risk of flooding.Flooding has been news across the UK in the past year, with the appropriate Government departments making significant funds available for flood relief measures.

Contractor, George Leslie Ltd, installing precast combined sewer overflow panel system supplied by Kijlstra for the Glasgow Environment programme to reduce the risk of flooding.Flooding has been news across the UK in the past year, with the appropriate Government departments making significant funds available for flood relief measures.

Glasgow is no exception and Scottish Water is currently in the early stages of a £250 million five-year programme of work to upgrade its waste water network in the Greater Glasgow area.

This scheme is the biggest investment in Glasgow’s waste water network since Victorian times and is designed to alleviate sewer flooding and deal with the effects of increased rainfall and climate change.

It will also improve river water quality and the natural environment in the River Clyde and its tributaries.

Contractor, George Leslie Ltd, is undertaking major sewer network improvements, which include installing a series of combined sewer overflow (CSO) chambers at strategic points on the sewer network.

In combined sewers, which carry both domestic waste and surface water run-off, CSO chambers act as emergency discharge valves to prevent flooding during periods of heavy or prolonged rainfall.
The CSO reduces the hydraulic loading on the treatment plant by diverting dilute excess flows to appropriate alternative water-bodies.

These structures, some of which measure up to 12 m in length and over 5 m wide, are traditionally constructed in-situ, with concrete poured into a formwork erected in the excavation and containing reinforcing steel.

The alternative is to install precast concrete CSO chambers. Small ones can be supplied in one piece, with just the internal fixtures and seals requiring to be fitted on site.

Larger CSO chambers can be assembled from precast components (these are often referred to as ‘panel systems’) either on a concrete base slab cast in-situ or on a slab which is also made from precast panels.

Kiljstra is one of two precast concrete suppliers regularly employed by George Leslie Ltd on the Glasgow Environmental Programme and has supplied ten CSO chambers, three headwalls and seven kiosk bases in various sizes since the programme got underway.

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