SECTIONAL JUNCTION BOX

Internal dimensions: 610mm x 460mm
Maximum size through knock-out web 290mm
Modules: 150mm (45kg.), 225mm (68kg.) and 300mm (90kg.)
Approximate weight with no lid: 230kg.

Machine made reinforced concrete sections in accordance with BS.5911 part 2, with mating rebated edges which can be easily assembled to various depths. Provided with un-reinforced knock-out sections to accommodate pipe entry where required. There is a 50mm thick concrete slab for the base and a range of lid options

Standard Lid for Sectional Junction Box

Approximate weight: 120kg.
A 65mm thick reinforced concrete lid with recessed galvanized handles is fitted into a 100mm thick concrete surround locating on the junction box extension. Suitable for pedestrian areas, not for heavy traffic.

Pressed Steel Lid for Sectional Junction Box

Approximate weight: 60kg.
Steel frame is cast into the reinforced concrete surround effectively 50mm thick and fitted with 17 tonne GVW pressed galvanized steel lid

Heavy Duty Lid for Sectional Junction Box

Approximate weight: 160kg.
125mm thick reinforced concrete lid fits into a 180mm deep concrete surround locating on the junction box extension. Galvanized steel lifting keys are available for use with these lids.

	A	B	C
Frame Width	660	575	455
Frame Width	810	730	605

Surface Water Inlet and Trap for Sectional Junction Box

A galvanized funnel adapts the 610mm x 460mm sections to take a galvanized steel trash box along with the surface water inlet grating.

INSTALLATION

Make a sufficiently deep excavation to allow for the thickness of the base slab and the silt capacity of the unit. Remove the knock-out webs in the sides that are to receive the drains, preferably by the use of an abrasive disc angle grinder. Lay the base slab on a smoothed level bottom. the first extension determines the silt capacity and is identified by the rebate position. This should be located on the base and the pipes connected in. Carefully backfill some of the soil around the pipes at this stage. Fit the next extension over the pipes and backfill to this level. Make good around the pipes with cement mortar. Clean out loose material from inside the chamber and continue assembling extension sections and lid before completing the backfilling. For best results where heavy traffic is expected, backfill around the chamber with dry mixed concrete. Grating approximate weight 20kg.