Mike Harper - NextGen Events
Mike Harper - NextGen Events
Mike Harper - NextGen Events
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safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Youre not putting that in my<br />
road<br />
Micro-trench reinstatement<br />
Presented By: <strong>Mike</strong> <strong>Harper</strong> – Development Director, Stirling Lloyd.<br />
<strong>NextGen</strong> 12 - London<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Micro-trenching Reinstatement<br />
• What is the problem?<br />
• Why Micro-trench?<br />
• Limitations of traditional<br />
reinstatement<br />
• Incorrect approaches<br />
• Whats required?<br />
• The Safetrack approach<br />
• Step by step examples<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
What is the problem?<br />
• Micro trenching not covered by<br />
the new yellow book<br />
• Little existing knowledge on how<br />
to reinstate micro trenches<br />
• Councils object on grounds of<br />
• Youre cutting my road in half<br />
• No specification<br />
• Water ingress into the road<br />
• No HAPAS approval<br />
• Cant compact asphalt in a slot<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Why Microtrench?<br />
1 - Its Much Faster<br />
! 4 to 5x faster than open trench<br />
! 600 ln m per day on a trunk<br />
route (achieved in Shetland)<br />
! Less disruption to the public<br />
! Less traffic congestion<br />
Getting FTTP to 90% of UK addresses<br />
could mean 247,500 km of fibre<br />
installation!<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Why Microtrench?<br />
2 - Lower Environmental Impact<br />
! Significantly less waste created<br />
to be disposed of<br />
! Less new materials imported<br />
! Fewer truck movements because<br />
of the above<br />
! Less traffic congestion because<br />
of fast turnaround<br />
! All this means lower CO 2<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Why Microtrench?<br />
3 - Lower Cost<br />
! Lower costs because of speed /<br />
waste & new material<br />
! Lower long term maintenance<br />
costs if you get the reinstatement<br />
right (no secondary compaction /<br />
sunken trenches)<br />
! Less damage to the highway<br />
asset (shallower – less impact on<br />
sub-base / surface course and<br />
services)<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
What is the problem?<br />
• Traditional reinstatement materials<br />
(macadam & asphalt) were not designed<br />
for this.<br />
• Cant place / compact hot asphalt /<br />
macadam in a 20mm wide slot<br />
• Pouring neat bitumen is not the solution<br />
(no strength or skid resistance)<br />
• Trying to tamp cold lay asphalt? Early<br />
failure due to lack of compaction<br />
• Most methods will let water into the<br />
pavement!!<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Incorrect approaches and why?<br />
1. Cement grout to the surface<br />
Not flexible<br />
No bond to asphalt<br />
Cracking / water ingress<br />
Slow strength gain<br />
2. Epoxy Mortar<br />
Not flexible<br />
Long cure time = greater disruption<br />
Cracking / water ingress<br />
2. Cold lay macadam<br />
Needs adequate compaction to<br />
achieve cohesion<br />
Little bond to cut asphalt edges<br />
Ineffective seal – water ingress<br />
Lack of cohesion<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
What current advice is there?<br />
• Most recent advice note from DCMS –<br />
the Department for Culture, Media & Sport<br />
- outlines current best practice<br />
• This can be complied with and is a good<br />
start<br />
• Key drawback is reinstatement in the<br />
asphalt layer only at depths that exceed<br />
the asphalt depth in evolved roads<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
So what do we need to reinstate a micro-trench effectively?<br />
• A fluid material that will penetrate -<br />
needs no compaction<br />
• High bond strength to the cut asphalt<br />
• Supports the cut edges of the asphalt<br />
• Compatible flexibility with asphalt<br />
• No shrinkage & waterproof seal<br />
• Skid resistance<br />
• Dimensional stability under traffic<br />
• Fast return to service<br />
• BBA / HAPAS approval<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
The Safetrack approach<br />
• Materials designed for highway use<br />
• Safetrack is fluid & self compacting<br />
• Cold applied – safe to use<br />
• No site mix – Factory batched (QA)<br />
• Dimensional stability – cant be trafficked<br />
out, rut or sink (no secondary compaction)<br />
• Bond strength > cohesive strength of asphalt<br />
(bonds the road back together)<br />
• Waterproof and seals the road<br />
• Skid resistant<br />
• No glare<br />
• BBA / HAPAS approved<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
The Safetrack approach<br />
Additional benefits<br />
• No specialist equipment = quality installation<br />
from every team, all the time.<br />
• No heating = no risks to public and<br />
operatives + less CO2.<br />
• Safetrack MTI indicator layer = reduces risk<br />
of accidental damage in future by using yellow<br />
below the surface<br />
• Doesnt damage the fibre installation<br />
• Permits removal / reinstatement of duct if<br />
required.<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Successful Safetrack Microtrench Installations<br />
South Wales – Safetrack approved for use by the<br />
Welsh Assembly for microtrenching on trunk roads<br />
in 2009<br />
Shetland – Safetrack products successfully used<br />
over last 3 years – now on Phase 4.<br />
Galway – Safetrack products used over last 2<br />
years – now in Phase 2.<br />
Bournemouth – multiple products tried without<br />
success. Safetrack products were the only ones<br />
regarded successful by Bournemouth CC.<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
Microtrenching<br />
Step by step through the process<br />
www.stirlinglloyd.com
safetrack ®<br />
Cutting<br />
Micro-Trench Reinstatement Techniques<br />
• Cutting machine type<br />
is very important<br />
• Match the duct to the<br />
cut size<br />
• Avoid oversize cutting<br />
• 20mm cut / 16mm<br />
duct is ideal where<br />
possible<br />
www.stirlinglloyd.com
safetrack ®<br />
Cutting<br />
Micro-Trench Reinstatement Techniques<br />
• Dry cutting is a clean<br />
process - no slurry<br />
waste from wet cutting<br />
• Vacuum extraction<br />
hoovers dust from<br />
the slot<br />
• Cutting depth is<br />
constant (150mm here)<br />
• Overbreak along the<br />
cut is minimal<br />
www.stirlinglloyd.com
safetrack ®<br />
Cutting<br />
Micro-Trench Reinstatement Techniques<br />
• Vacuum extraction<br />
avoids dust<br />
www.stirlinglloyd.com
safetrack ®<br />
Cutting<br />
Micro-Trench Reinstatement Techniques<br />
• Resultant cut is even<br />
width<br />
• Minimal damage to<br />
surrounding asphalt<br />
• Minimal work area<br />
• Fast, clean and<br />
accurate<br />
www.stirlinglloyd.com
safetrack ®<br />
Drying<br />
Micro-Trench Reinstatement Techniques<br />
• Safetrack drying lance<br />
removes any residual<br />
dust<br />
• Dries the cut asphalt<br />
faces using air and / or<br />
heat if required<br />
• A clean dry asphalt<br />
face = high bond<br />
strength and a good<br />
seal<br />
www.stirlinglloyd.com
safetrack ®<br />
Installation<br />
Micro-Trench Reinstatement Techniques<br />
• Protective foam strip into the<br />
bottom of the micro-trench<br />
• Microduct – with or without fibres<br />
– is installed<br />
• A protective foam strip is applied<br />
over the duct<br />
• The micro-trench is now ready to<br />
be permanently reinstated<br />
www.stirlinglloyd.com
safetrack ®<br />
Reinstatement<br />
Micro-Trench Reinstatement Techniques<br />
• Installing Safetrack<br />
Crack Infill into the<br />
micro-trench<br />
• Cold process – simple<br />
and accurate placement<br />
• Can use yellow<br />
indicator below the<br />
surface to avoid future<br />
damage<br />
• BBA / HAPAS<br />
approved product<br />
www.stirlinglloyd.com
safetrack ®<br />
Reinstatement<br />
Micro-Trench Reinstatement Techniques<br />
• Yellow first pass up to<br />
10mm from the surface<br />
• Black capping layer<br />
with embedded<br />
aggregate for skid<br />
resistance<br />
www.stirlinglloyd.com
safetrack ®<br />
Reinstatement<br />
Micro-Trench Reinstatement Techniques<br />
• Safetrack<br />
Overbanding black<br />
surface layer<br />
• Aggregate overscatter<br />
www.stirlinglloyd.com
safetrack ®<br />
Reinstatement<br />
Micro-Trench Reinstatement Techniques<br />
• Process train<br />
approach moves<br />
continuously along the<br />
road<br />
• All the processes are<br />
in this image<br />
• Rapid cure of the<br />
reinstatement means<br />
minimal traffic<br />
management behind<br />
the works<br />
• 600 ln m per day<br />
complete installation<br />
www.stirlinglloyd.com
safetrack ®<br />
Reinstatement<br />
Micro-Trench Reinstatement Techniques<br />
• Completed micro-trench<br />
• Fibre duct installed at 150mm deep<br />
• Safetrack Overbanding permanent<br />
reinstatement<br />
• Up to 600 ln m per day completed and<br />
returned to service same day (Shetland<br />
rural roads)<br />
www.stirlinglloyd.com
safetrack ®<br />
Micro-Trench Reinstatement Techniques<br />
But weve always done it this way ……<br />
• Traditional trench dig would be 5x slower<br />
• Would create much more disruption for<br />
residents and road users<br />
• Uses far more material and creates much<br />
more waste<br />
• Far higher carbon footprint<br />
• Much greater damage to the road or<br />
pavement asset and likely requirements for<br />
more long term maintenance (secondary<br />
compaction etc)<br />
• We need micro-trenching but we need to<br />
do it right.<br />
www.stirlinglloyd.com
safetrack ®<br />
Questions?<br />
Micro-Trench Reinstatement Techniques<br />
For more information contact us:<br />
t: 01565 633111<br />
m: 07976 517200<br />
e: mike.harper@stirlinglloyd.com<br />
w: www.highwaymaintenanceproducts.co.uk<br />
www.stirlinglloyd.com