Joint boxes, footways and frames & covers
Carriageway JBC4
Box design and specications may vary. This will be determined by the duct lay-out and whether
multi-way ducts or major road crossings need to be incorporated into the design.
Materials
• Bricks: BS EN771-1. English Bond.
• Cement: BS12 Portland Cement.
• Concrete: BS EN206 Grade 32/40 concrete.
• Mortar: BS5628, Part1 requirement for
mortar Table 1, Type (i).
Base
• Cement: BS12 Portland Cement.
• Concrete: 200mm concrete Grade 32/40,
reinforced with A393 grade mesh at
70mm cover.
Brickwork
• Bricks: BS EN771-1. English Bond.
• All brickwork to be keyed in at corners
and pointed.
• Brickwork to be ‘English Bond’ constructed
with a 10mm joint thickness of cement mortar.
Frame and cover
• Frame and Cover Carriageway no.4 to be
squarely set on a mortar bed Highway Agency
standards HA104.
Lifting keys
• Key Joint Box Lifter should be used to lift
the cover and can be purchased from TW
Engineering Co Ltd at www.twtools.co.uk
(tel: 0115 932 3223) or similar supplier of
your choosing.
Duct entries
• Duct to be cut ush to the internal box wall.
• Duct must not enter through corners and be
no less than 75mm from the side wall.
• Duct to enter wall no less than 600mm
from the top of the frame.
• Duct to be no less than 100mm from the
box base.
Bolts foundation for
wall bearer/brackets
Concrete
base
F
or use with carriageway no.4
frame and cover
A393 Mesh
950x950
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