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go back to main site what is the design life of precast concrete drainage components? posted november 27, 2018 by kieran fields & filed under pipes & manholes . 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 will last 800 years. most will claim a design life of between 50 and 125 years. this does not mean that a pipe product will cease to work efficiently at the end of this time because its service life may be very different. design life is usually the period over which an asset’s depreciation is calculated. design life should not be confused with service life, which is the length of time a component can be expected to perform before its performance falls below the original design requirements without requiring renovation or replacement. a major advantage of precast concrete drainage systems is that they have a proven long service life, typically in excess of 120 years. this 120 year “reference service life” is a requirement for infrastructure design and asset management assessment standards such as pas 2080 carbon management in infrastructure and series 1700 of the specification for highway works in england (ng 1704). in the uk some soils are more aggressive to pipes than others. as a safeguard precast concrete is manufactured using design chemical class 4 concrete to achieve a working life of 100 years in soils with an aggressive chemical environment for concrete class ac-4, without the need for additional protective measures. however, where a sewer, drain or other component within the system is liable to carry: a rising main discharge; septic sewage; untreated or corrosive trade effluents; and in situations without adequate ventilation, then additional protective measures should be considered to achieve a design life of, say, 120 years. bpda has an extensive library of useful information and guidance publications for designers, installers and asset owners. they are available to download free of charge from the bpda’s website. the site also holds a comprehensive and searchable faq section and an online enquiry facility; go to www.precastdrainage.co.uk what is the minimum depth of cover needed for concrete pipes? posted november 12, 2018 by kieran fields & filed under pipes & manholes . 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 road traffic or to pipelines installed within fields where only occasional trafficking, for example from agricultural equipment may be expected. a third loading scenario is also sometimes used which is based on light road trafficking, for example traffic within a residential area, although heavier vehicles may have access to these locations and the main road loading condition is often preferred for design. cover depths of less than the minimum values published in these documents should only be used with the appropriate authority’s permission. sewers for adoption, for example, requires the minimum depth of cover to the crown of gravity pipes without protection to be as follows: in domestic gardens and pathways where there is no possibility of vehicular access, 0.35 m; 0.5 m for domestic driveways, parking areas and yards with height restrictions to prevent entry by vehicles with a gross vehicle weight in excess of 7.5 tonnes; domestic driveways, parking areas and narrow streets without footways (e.g., mews developments) with limited access for vehicles with a gross vehicle weight in excess of 7.5 tonnes, 0.9 m; agricultural land and public open space, 0.9 m; other highways and parking areas with unrestricted access to vehicles with a gross vehicle weight in excess of 7.5 tonnes, 1.2 m. it is common practice that pipes laid under main roads to have at least 1.2m of cover to avoid conflict with other services. this is also true for the grass verges at the side of the road and for light roads, which may on occasion need to carry main road traffic. however, minimum cover depths could be reduced (with the appropriate authority’s permission) if appropriately bedded concrete pipes are used according to transport research organisation trl simplified tables of external loads on buried pipelines. it says the inherent strength of standard strength class 120 concrete pipes enables the cover depth to be reduced to a minimum depth of 0.6m beneath a highway when installed in conjunction with a full granular bedding surround, bedding class s. for concrete pipes laid in fields the bpda recommends a minimum cover of 0.6m should be provided to prevent damage from agricultural operations. where concrete pipes are required to be laid in fields at cover depths of less than 0.6m bs9295 annex a, a16 gives recommendations for protection. the preferred solution is to use a reinforced concrete slab installed over the pipeline which extends to provide at least 300mm bearing each side of the trench. a layer of compressible material placed directly over the pipeline aids in the prevention of the slab loading directly onto the pipeline should settlement occur. another method of protection at shallow cover depth is to use a concrete surround to the pipeline, bedding class a. for pipelines under construction, where plant has to cross a pipeline, consideration should be given to providing dedicated crossing points which may consist of heavy steel plates bridging the trench to transfer vehicle loads away from the pipeline or additional cover material placed over the pipeline. bpda has an extensive library of useful information and guidance publications for designers, installers and asset owners. they are available to download free of charge from the bpda’s website. the site also holds a comprehensive and searchable faq section and an online enquiry facility; go to www.precastdrainage.co.uk the creator of the first sustainable drainage system posted september 28, 2018 by kieran fields & filed under suds . joseph bazalgette sir joseph bazalgette (1819 – 1891) was the chief engineer of london’s metropolitan board of works. born in london on the 28 th march 1819, bazalgette began his career as a railway engineer. during this role he gained considerable experience in land drainage and reclamation. when the london metropolitan board of works was established in 1856, joseph bazalgette was elected the first and only chief engineer. the board of works was the first organisation provided to supervise public works all over the city. mid-19th century london in the mid-19th century, london was struck by a cholera epidemic, which killed over 10,000 people. at the time it was thought that the disease was caused by foul air that filled the streets of london. along with the frequent occurrence of cholera outbreaks, a hot summer brought with it the ‘great stink’, which overwhelmed the city. the solution the condition of mid-19th century london was an incentive for parliament to give legislation to the board of works. the legislation allowed them to begin improvements on the sewers and streets. it was expected that the new sewer system would eliminate the great stink, which would reduce the outbreaks of cholera. bazalgette’s solution was to create a sewer network for central london that extended 82 miles. the underground network consisted of main sewers to intercept sewage outflows as well as street sewers. these new sewers would replace the raw sewage flowing through the thoroughfares and streets of london. although the impression was that foul air caused cholera was wrong, it

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https://precastdrainageblog.co.uk/category/innovation/
https://precastdrainageblog.co.uk/2016/06/
https://precastdrainageblog.co.uk/2014/03/
https://precastdrainageblog.co.uk/2018/11/
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https://precastdrainageblog.co.uk/2018/01/below-ground-fire-protection-not-just-a-whim/
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