It has been estimated by DEFRA that significantly less than 1% of public sewers are being renovated or replaced each year. If that rate of replacement is continued, it will take approximately 800 years before a new pipeline laid today can be expected to be replaced. No product carries a certificate to say that it… Read more »
Minimum cover depths for concrete pipes vary depending on the vehicular traffic loading likely to be sustained by the pipeline. There are various industry specifications and Standards that state values for minimum cover depths based on these loading conditions. Most loading conditions used for design either relate to patterns of wheel loading generated from main… Read more »
When inspection or maintenance of buried wastewater drainage systems is required a manhole is specified. They are most often built at the point where one pipeline connects to another, where a pipeline changes size, direction or gradient and at a spacing that enables equipment to be used effectively. Here we detail some advice for specifying… Read more »
In any construction project, bad ground conditions can create a wide range of problems and can even bring construction to a halt. This is why when Peter Harding Construction began work at St Wilfreds Academy in Blackburn, they knew they needed a drainage solution. The solution had to combat the poor ground conditions, not hinder… Read more »
Precast concrete has been around for many years. This time-proven, strong, durable and sustainable material continues to develop as new products and systems are introduced helping to deliver safer, cheaper and faster build times with reduced environmental impacts. The precast manhole system comprises a factory produced monolithic concrete base unit, supplied complete with channel and… Read more »
Precast concrete drainage products have enabled Highways England’s main project contractor Costain to safely deliver a new £192 million dual carriageway section of the A556 trunk road between the Cheshire towns of Knutsford in the south and Bowdon in the north. The dual carriageway enables this strategic route to bypass the villages of Tabley, Mere… Read more »
Concrete pipeline systems manufacturers are determined to continuously innovate as the industry strives for improved pipeline and manhole construction quality and performance, delivering reduced waste, lower costs, faster build times and minimised environmental impacts. The design flexibility of concrete pipe and manhole systems means that many special features can be incorporated in the factory and simply… Read more »
Traditionally, manhole construction has required the base to be formed in-situ where building of the channel, connections and benching occurs in the trench, often in confined spaces that can present a safety hazard for operatives frequently encountering wet and unpleasant conditions. The process can take around 40 hours per manhole to complete and is not… Read more »
Off-site manufactured precast concrete base manhole systems offer some big advantages compared to traditional in-situ solutions. Clients, contractors and specifiers have, until now, been unable to take full advantage of the benefits of using a precast solution for circular manholes because the British Standard did not include a specification for the precast base unit. That… Read more »
The development of circular precast manhole systems was introduced by the precast concrete pipeline industry in collaboration with the supply chain to provide a value engineered solution. The new manhole system comprises a circular, precast concrete base unit and new thicker-walled chamber rings with watertight flexible joints. These have the benefit of superior quality as… Read more »
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