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Concrete Drainage - Box Culverts

Precast Concrete Box Culverts
Design Chemical Class DC-4 Resistance

Milton Precast Concrete Box Culverts are specified and used rejlarly for culverting highways, storm and foul sewers, sea outfalls, tunnels and subways, underpasses, steam crossings, vertical chambers and in modified form as channels with removable slabs or as portals. In addition they may be used as tanks for attenuation of storm or foul water and can be provided with dished inverts or channels for dry weather flow.

Box Culverts provide high flow capacities even where the gradient is low or headroom is restricted. They are individually designed to cater for a wide range of external loading conditions from shallow to deep fill.


It is generally recommended that the culvert should be installed on a 200 thick ganualr bedding as specified in the Specification for Highway Works (MCDHW) or UK WIR Ltd 'Civil engineering specification for the water industry'. Alternative bedding designs using insitu concrete and blinding or piling may be required in poor ground.

Laying and Jointing

Joint priming may be applied at works or on site. Position the first unit with the socket facing the direction of construction to reive the second unit. Fix the appropriate type of jointing tackle to the culverts and apply the Milseal joining strip to the sloping primed face of the socket to form a complete gasket mitring joins and at the ocrners.

Supporting the weight of the second unit, guide it as closely as possible to the first unit taking care to exclude any bedding material. Carefully draw the spigot of the second culvert into the socket of the first. The flexible jointing compound should be compressed by no less than 30% to effect the necessary seal. This is achieved when the gap between the joint faces on the inside of the culvert does not exceed 10mm. It is recommended that the dead anchor is not relocated for jointing subsequent units until the cable or chain length is exceeded. Jointing equipment should be capable of providing a force of 10kN per metre run of jointing strip.