Big J Inspection Chamber
NOT STOCKED – MADE TO ORDER
A new concept in chamber design. A two-piece unit where the base is integral with the sides. The required pipe openings are cast-in at any desired position, no brickwork or shuttering is required, no awkward holes to be cut. Big ‘J’ chambers are supplied complete with galvanized step irons and all necessary fixings and come complete with heavy duty cover slabs and manhole access. All units have special lift points cast.
Chamber Extensions
Internal dimensions: 600mm x 600mm
Modules: 150mm, 225mm and 300mm depths
Approximate weight: 50kg., 75kg. and 100kg.
Machine-made reinforced concrete sections to BS.5911 part 2 are fitted on the lid of the Big ‘J’ chamber to extend the opening to ground level. Standard 600mm x 600mm galvanized 17 tonne GVW pressed steel manhole covers cast into a 100mm thick concrete surround are available to fit these units.
INSTALLATION
Depending on site conditions, it is recommended that these units should be bedded on 100mm of ready mixed concrete. Each section should be hoisted into position separately ensuring that rebated joints properly locate. Use the galvanizes bolts through the fixing brackets at each side to keep the units together during backfilling. Do not over tighten. The drain pipes should just enter the chamber or remain flush on the inside. Make good the voids around the pipes with cement mortar. Make sure the opening in the cover slab is located over the side with the step irons. Rectangular inspection chamber sections can be positioned over the access hole to extend the chamber to required ground level (see below) or full sized extension sections are also available.
| BIG ‘J’ SIZE | (D) 1220 x (W) 1070 | (D) 1630 x (W) 1070 | (D) 1830 x (W) 1375 | (D) 1830 x (W) 1675 | APPLICATIONS |
| Height (H) of basic chamber | 810mm 1120mm 1420mm 1735mm 2030mm 2340mm |
810mm 1120mm 1420mm 1735mm 2030mm 2340mm |
780mm 1085mm 1390mm 1695mm 2000mm |
780mm 1085mm 1390mm 1695mm 2000mm |
Manhole
Piped Ditch Inlet Tumbling Bay Flow Meter Box Pumping Sump Siphon Pit Effluent Storage |
| Height (H) with extension section | 2255mm 2560mm 2865mm 3170mm 3475mm 3780mm |
2255mm 2560mm 2865mm 3170mm 3475mm 3780mm |
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| Maximum O.D. of pipe recommended | 830mm | 830mm | 1135mm | 1440mm |
