Box Culverts - FP McCann Ltd

Box Culverts
FP McCann
Tel : 01773 520273 precast@fpmccann.co.uk www.fpmccann.co.uk Fax : 01773 546514

Box Culverts
I N T R O D U C T I O N
Designed and manufactured in
accordance with all current design
specifications and relevant standards,
FP McCann box culverts are available in
span sizes from 1000mm to 5400mm
and internal heights from 500mm to
3600mm dependant on the final mould
configuration adopted.
A bespoke CAD design service is also
available where non-standard unit sizes
can be accommodated along with any
other internal features requested by the
client.
FP McCann's experienced engineers
and detailing team together with a
modern production facility at Telford,
Shropshire, have the flexibility to
quickly respond to meet any design
criteria and deliver nationally to
just-in-time requirements.
Supplied in either single or multiple
runs, the use of precast concrete box
sections in civil engineering projects is
wide ranging, from their use for
directing watercourses to the provision
of attenuation tanks and underpasses.
FP McCann is a member of the Box
Culvert Association (BCA) and products
comply with all relevant standards as
set out in accordance with BS ISO 9001
and 14001.
www.fpmccann.co.uk
Tel : 01773 520273 Fax : 01773 546514

Benefits of Box Culverts
Ease of installation
Can be easily positioned in shallow or
deep fill installations.
Structural strength and long life
performance
Durable system meeting the design
life requirements for buried
structures. Minimum maintenance
required.
Flexible sizes and internal features
Can be manufactured in a range of
sizes and accommodate features such
as dual cells, dry weather flow
channels and mammal ledges, plus
tapered and skewed units if required.
Factory quality finish
Off site manufacturing to relevant QA
standards.
Box Culvert Applications:-
• Attenuation and storage tanks
• Water course diversion
• Open channels
• Road crossings
• Pedestrian and vehicle subways
• Mammal crossings
• Shafts
• Service tunnels and ducts
• Conveyor protection cover
End walls, access points, vent holes,
inlets, outlets, rungs, angles and splayed
ends can all be added to any run of
culvert. Starter bars and sockets can be
added to facilitate any additional
casting on site which may be required
as part of the finished work.
Easi-Cast
www.fpmccann.co.uk www.fpmccann.co.uk
precast@fpmccann.co.uk

Box Culverts
Typical Culvert :
Internal span and height from
5400mm and 500mm in lengths up to
2200mm (dependant on the culvert
profile and span sizes)
Channels :
Half round (or equivalent) channels
can be cast into the floor of the units
at any position with a choice of
diameters
Benching :
Combined with either a channel
or cast as a “vee” benching
improves self cleansing flow rates
www.fpmccann.co.uk
Tel : 01773 520273 Fax : 01773 546514

Mammal Ledges :
Cast in mammal ledges allow access
through the culvert to wildlife without
the requirement for extra site
provisions
Dual Cell :
Two water courses cast into a single unit
Specials :
Bespoke units accommodating a
variety of features can be
manufactured to the customer’s
design requirements
Easi-Cast
www.fpmccann.co.uk www.fpmccann.co.uk
precast@fpmccann.co.uk

Box Culverts
Internal Dimensions and Flow Area m 2
(Based on flat invert culvert units)
INSTALLATION GUIDELINES
For installation and jointing details,
refer to the Box Culvert Association’s
“Guide to Site Practice” which can be
downloaded from the BCA’s website,
www.boxculvert.org.uk
Width mm (internal span)
1000 1200 1500 1800 2100 2400 2700 3000 3300 3600 3900 4200 4500 4800 5100 5400
500 0.46 0.56 0.71 0.86 1.01 - - - - - - - - - - -
DESIGN CRITERIA
Design loading criteria is generally
specified by the scheme engineer and
ideally should include as a minimum
the information below:
600 0.56 0.68 0.86 1.04 1.22 - - - - - - - - - - -
650 0.61 0.78 0.98 1.17 1.37 1.56 1.68 - - - - - - - - -
800 0.76 0.92 1.16 1.40 1.64 1.88 2.12 2.33 2.57 2.81 3.08 - - - - -
1000 0.96 1.16 1.46 1.76 2.06 2.36 2.66 2.93 3.23 3.53 3.86 4.16 4.46 4.76 - -
Min depth of fill over
the culvert unit
Internal height mm
1200 - 1.40 1.76 2.12 2.48 2.84 3.20 3.53 3.89 4.25 4.64 5.00 5.36 5.72 6.08 6.44
1500 - - 2.21 2.66 3.11 3.56 4.01 4.43 4.88 5.33 5.78 6.23 6.68 7.13 7.58 8.03
1800 - - - 3.20 3.74 4.28 4.82 5.33 5.87 6.41 6.98 7.52 8.06 8.60 9.14 9.68
2100 - - - - 4.37 5.00 5.63 6.23 6.86 7.49 8.15 8.78 9.41 10.04 10.67 11.30
Max depth of fill over
the culvert unit
green field, highway etc
2400 - - - - - 5.72 6.44 7.13 7.85 8.57 9.32 10.04 10.76 11.48 12.20 12.92
2700 - - - - - - 7.25 8.03 8.84 9.65 10.49 11.30 12.11 12.92 13.73 14.54
3000 - - - - - - - 8.93 9.83 10.73 11.66 12.56 13.46 14.36 15.26 16.16
3300 - - - - - - - - 10.82 11.81 12.83 13.82 14.81 15.80 16.79 17.78
Exposure conditions should be
specified and where available, design
codes provided. Further design
requirements may include for
inlet/outlet points, access holes and
end walls.
3600 - - - - - - - - - 12.92 14.00 15.08 16.16 17.24 18.32 19.40
Flow area m 2
For dry weather flow (dwf ) options, please contact the sales office
Please note:- These figures are a guide only and will be dependant on the mould configuration used in manufacture
www.fpmccann.co.uk
Tel : 01773 520273 Fax : 01773 546514
Easi-Cast
www.fpmccann.co.uk www.fpmccann.co.uk
precast@fpmccann.co.uk

Box Culverts
Unit 6 Keypoint Office Village
Keys Road
Nix’s Hill Industrial Estate
Alfreton, Derbyshire
DE55 7FQ
Tel : 01773 520273
Tel : 01773 520273
precast@fpmccann.co.uk
www.fpmccann.co.uk
Fax : 01773 546514