Precast Concrete Box Culverts
Milton Precast Concrete Box Culverts are specified and used regularly for culverting highways, storm and foul sewers, sea outfalls, tunnels and subways, underpasses, stream 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.
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. Click Here for a graphical representation of the tabulated sizes
Bedding
It is generally recommended that the culverts should be installed on a 200 thick granular bedding as specified in the Specification for Highway Works (MCDHW) or UK WIR Ltd 'Civil engineering specification for the water industry'.
Laying & Jointing
Priming may be applied at works on the site. Position the first unit with the socket facing the direction of construction to receive the second unit. Fix the appropriate type of jointing tackle to the culverts and apply the Milseal rubber bitumen jointing strip to the sloping primed face of the socket to form a complete gasket mitring joins and at the corners.
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 joint compound should be compressed by not 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.