BS 5911-3:2010+A1:2014 PDF Download

BS 5911-3:2010+A1:2014 is a standard that complements BS EN 1917:2002 by specifying additional requirements for unreinforced and reinforced concrete manholes of circular and rectangular cross-sections. The standard covers manholes with or without chamfered or rounded corners, with nominal sizes or lengths not exceeding DN 1250 or LN 1250 respectively. It also provides full requirements for unreinforced and reinforced circular concrete manholes with nominal sizes greater than DN 1250 but not exceeding DN 3000.

The purpose of these manholes is to permit access to, and aeration of, drain or sewer systems used for the conveyance of sewage, rainwater, and surface water under gravity or occasionally at low head of pressure. They are primarily installed in areas subjected to vehicular and/or pedestrian traffic, including carriageways of roads, hard shoulders, parking areas, and pedestrian streets. The standard also considers units subject to lighter traffic loading.

In addition to manholes, the standard specifies requirements for base units, elastomeric load bearing seals, soakaways, landing slabs, and corbel slabs. Furthermore, the standard acknowledges that rectangular manholes greater than LN 1250 should be treated as structures and require accompanying calculations according to relevant Eurocodes. It also notes that other standards like BS EN 752, BS EN 1295-1, and BS EN 1610 are relevant for the planning, design, installation, and testing of drains and sewers.