Hargreaves Halifax HD4481 100mm x 100mm Cast Iron Grey Rectangular Inspection Chamber
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Call for Availability100x100mm precast chamber unit with a rectangular door, avoiding a brick-built manhole at a twin branch junction below ground.
- Configuration - Rectangular door chamber sized for a twin branch junction.
- Footprint - 100x100mm branch sizing, matching the Halifax Drain range at this diameter.
- Body - Formed from grey cast iron to the BS EN 877 specification, epoxy coated to an average minimum of 150 microns.
- Servicing - The bolted rectangular door opens for rodding and inspection at the junction.
Installing a full brick or concrete manhole is not always proportionate for a smaller buried junction. The Halifax HD4481 packages a twin branch junction and a rectangular access door into one 100x100mm precast unit that drops straight into the run.
Why a chamber unit
Maintenance access at a junction follows the same general principle as elsewhere in BS EN 12056-2: somewhere to rod and inspect the pipework without digging it up. A precast chamber gets there without the labour of building a manhole from scratch, and this rectangular door version is sized for a twin branch configuration.
Build
- Casting - Formed from grey cast iron to the BS EN 877 specification, epoxy coated to an average minimum of 150 microns.
- Access door - Bolted rectangular door over the junction, opened for rodding and inspection.
Settlement
Where pipework leaves a building or manhole and may be subject to settlement, the guide recommends at least two joints within 600mm of the exit point, acting as a short rocker pipe; the couplings used across the Halifax system are designed to accommodate up to 3 degrees of deflection, which combines with this short pipe length to absorb movement without compromising the joint.
Full dimensions are set out in the manufacturer's Halifax Technical Guide.