Foundations

Cast In Situ Versus Precast Installations

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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

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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

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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

Any questions?

Thank you for your time