www.nal.ltd.uk
About NAL
◆ Established in 1996
◆ Immediate impact in the highways industry with the innovative Retention Sockets
◆ Extended product range across the wider infrastructure industry
◆ Acquired by CRH – April 2018
Retention Sockets
Chamber and Duct Systems
Manhole covers and frames
Electrical Products
Bollards
Temporary Highway Products
Additional Products
CabinetBases
www.nal.ltd.uk
Cast In Situ - Advantages
In terms of initial outlay it is the cheapest method, and extremely effective
Ideal within urban locations due to space constraints
Is suitable for shallow depths
Can be poured around existing utilities
No need to compact the ground around the pour
Easier to level
www.nal.ltd.uk
Case Study – Network Rail Overbridge
Street lighting column
Installation depth 300mm
Precast Foundation unsuitable due to bridge deck installation
Appropriate Precast Foundation would be too wide, risk of breaking
Shallow foundation Retention Socket easily installed between existing services
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Case Study – Lambeth Lighting Columns
Underground services preventing standard 1200mm planting depth
Precast Foundation risks damage to underground services
600mm Retention Socket easily installed between existing services
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Precast- Advantages
Curing process is optimised as
it takes place within a factory
in ideal conditions
Labour costs are reduced due
to efficient manufacture and
less time required on site
Installation time is significantly
reduced
Foundations can be re-used –
positive environmental impact
Enables immediate
installations
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Case Study – M40 Lighting Column
Foundations designed to clients requirements
No requirement for wet trade on site
Reduced installation time
Certified lifting points enable simple, safe installation
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Case Study –Level Crossing Upgrade
Level crossing upgrades extremely disruptive – both roads and rail lines require shutdowns
Cast in situ installations unsuitable as time consuming and weather dependant
Precast foundations installed while existing road lights remain in operation
Closures kept to a minimum
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Analysis – Strengths and Weaknesses
Constraints/Priorities
Cast in situ Precast
Weather
Time
COSSH
Site Restrictions
Environment
Cost
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Cost Comparison
Application Cast in situ Precast
Flange Plated Sign/
Column
Bespoke flange plate pole: £1106 Bespoke flange plate pole: £1106
RS168 Retention Socket with Duckfoot Bend x 900mm deep: £314
Precast Foundation 1500 x 1500 x900 with RS168 Retention Socket: £1123
InstallationConcrete 2m³: £180Labour: £240
InstallationHiab: £150Labour: £120
Total Cost: £1840 Total: £2500
Installation time: 3 hours Installation time: 1.5 hours
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Cost Comparison
Application Cast in situ Precast
Standard Root Sign
Pole
168.3mm dia pole: £378 168.3mm dia pole: £378
RS168 Retention Socket with Duckfoot Bend x 900mm deep: £314
Precast foundation 1500 x 1500 x900 with RS168 Retention Socket: £1123
InstallationConcrete 2m³: 180Labour: £200
InstallationHiab: £150Labour: £80
Total: £1072 Total: £1731
Installation time: 2.5 hours Installation time: 1 hour