Trenchless Technology A review of methods and latest updates Matthew Izzard (Business Development Director – Tracto Technik UK) (Vice Chairman UKSTT) www.ukstt.org.uk
Who are UKSTT? United Kingdom Society of Trenchless Technology International Society of Trenchless Technology BSI & International Standards Representation
What we do: National Awareness Presentations Annual Awards & Gala Dinner Biennial No Dig Live Exhibition Technical & Masterclass Sessions University OutReach Program Regional Roadshows www.ukstt.org.uk
Open up the possibilities… FREE Technical Enquiry Service www.ukstt.org.uk admin@ukstt.org.uk Subscribe to our Newsletter 01926 513773 Over 1,500 Conferenc Arrange your own e Papers technical event: www.ukstt.org.uk
Benefits of Trenchless Technology: ✓ Reduces excavation ✓ Less disruptive ✓ Makes use of existing assets ✓ Faster installation rates ✓ Safer for public and contractors ✓ Environmentally beneficial www.ukstt.org.uk
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Safe Excavation Techniques: Increasingly used to minimise excavation as much as possible, minimising reinstatement and ensuring operators safety as much as possible. www.ukstt.org.uk
Coring: www.ukstt.org.uk
Vacuum Excavation: Distance and depth not an issue with a vacuum system instead of a suction unit. Courtesy: Mammoth MTS www.ukstt.org.uk
Vacuum Excavation: Courtesy: Mammoth MTS Courtesy: Mammoth MTS Courtesy: Mammoth MTS www.ukstt.org.uk
‘Core & Vac’ Use of keyhole excavation coring and vacuum excavation 4 hours vs. 7 days Benefits: • Smaller footprint. • Reduced reinstatement. • Many tasks can be performed including repairs and fittings. • Avoids damage to tree roots and other apparatus. www.ukstt.org.uk
Key Hole Technology: www.ukstt.org.uk
FTTH TRENCHING TECHNOLOGIES Plowing Productive equipment Trencher Soft ground to rock conditions Plow/Trencher Combo Different technologies matching Rockwheel different conditions Microtrencher Minitrencher www.ukstt.org.uk
PLOWING Soft ground conditions (no rock layers) High-speed production No backfill/compaction needed (trenchless) Optional front reel carrier for feed blades Feeding Up to multiple O.D. Ø 65 mm (2.6”) and 127 cm (50”) deep Pulling Up to single O.D. Ø 200 mm (8”) and 90 cm (35”) deep www.ukstt.org.uk
PLOWING Vibratory plow attachment Plow blade PULL CHUTE COMBO BLADE BLADE BLADE Custom-made blades matching project Large number of options to SINGLE-PIVOT DOUBLE-PIVOT RIGID meet exacting needs BLADE BLADE BLADE www.ukstt.org.uk
PLOWING www.ukstt.org.uk
TRENCHING Soft ground to moderate/broken rock conditions < 90 MPa (13.000 psi) Continuously opening of narrow, deep trench Up to 180 cm (72”) deep From 10 cm (4”) up to 45 cm (18”) wide Minimum volume of ground displacement www.ukstt.org.uk
TRENCHING www.ukstt.org.uk
TRENCHING: CUTTING EDGE Different cutting tool setups matching ground conditions www.ukstt.org.uk
ROCKWHEEL Moderate/broken rock conditions <110 MPa (16.000 psi) Continuously opening of narrow, deep trench Up to 132 cm (52 ”) deep From 10 cm (4 ”) up to 30 cm (12”) wide Minimum volume of ground displacement www.ukstt.org.uk
ROCKWHEEL Rockwheel attachment Rockwheel cutter segments Optional trench cleaner www.ukstt.org.uk
ROCKWHEEL www.ukstt.org.uk
MICROTRENCHER SYSTEM Minimally obtrusive installation process by which a narrow and relatively shallow trench is cut in an asphalt roadway, intended to house fiber-optic cable and conduit. Cut is often made in the seam between the asphalt roadway and concrete curb/apron Trench dimensions range from 19 - 57 mm (. 75” - 2.25 ”) wide and 20 - 41 cm (8 ” - 16 ”) deep, which is typically above existing utilities . www.ukstt.org.uk
MICROTRENCHING: VACUUM Simultaneously, a connected vacuum • system cleanly removes and contains the dry and dusty spoil away from the work site. After the conduit pipe is laid, a technique • approved by the local governing body is used to backfill the trench, returning structural integrity to the roadway. An asphalt sealer may then be used to • finish the cut flush with the surface www.ukstt.org.uk
MICROTRENCHING: SIDE DISCHARGE Uses traditional rockwheel technique, ejects • cutting alongside the trench After the conduit pipe is laid, a technique • approved by the local governing body is used to backfill the trench, returning structural integrity to the roadway. An asphalt sealer may then be used to finish the • cut flush with the surface www.ukstt.org.uk
MICROTRENCHER ATTACHMENT • Spring-loaded, flex pivot design aids steering, particularly around curves • Offset capability up to 5 cm(2”) outside the right rear tire • Two-stage lift and level design keeps attachment flush with the surface to maximize cutter wheel engagement and vacuum www.ukstt.org.uk
MICROTRENCHER WITH VACUUM www.ukstt.org.uk
MICROTRENCHER: SIDE DISCHARGE www.ukstt.org.uk
NARROW TRENCHING Opening narrow but deeper trenches Asphalt roadway, intended to house fiber-optic cable and conduit 50 mm (2”) or 57 mm (2¼”) wide, up to 60 cm (24”) deep Using traditional rockwheel technology Offset capability up to 41 cm(16”) www.ukstt.org.uk
NARROW TRENCHING: 50MM (2”): www.ukstt.org.uk
FTTH INSTALLATION Small footprint equipment Soft – compacted ground conditions www.ukstt.org.uk
RIDE-ON UTILITY EQUIPMENT Versatile self-propelled plow/trencher Small footprint to go close to buildings Trencher up to 106 cm (42”) x 15cm (6”) Plow up to 61 cm (24”) deep Ø 38 mm (1½”) feed Ø 76 mm (3”) pull www.ukstt.org.uk
Impact Moling / Thrustboring www.ukstt.org.uk
IMPACT MOLING ACCURACY Moving Head Fixed Head www.ukstt.org.uk
New Installation Impact Moling www.ukstt.org.uk
THE GOLDEN RULES! 10x Diameter of machine in Depth to prevent ‘ground heave’ (ie: 45mm = 450mm, 130mm = 1.3m) 5 x Diameter of machine in width to prevent ‘wandering’ into previous bore Average of 10% bore shrinkage with each size of Grundomat (ie: 45mm installs max. 40mm, 145mm installs 125mm etc) IMPORTANT: Always check plans and check with locating equipment prior to boring www.ukstt.org.uk
PIPE OR CABLE INSTALLATION Pull in direct • Reverse ‘mole’ • Direct P.E. • (Not clean water!) Direct uPVC • www.ukstt.org.uk
IMPACT MOLE “STITCHING” 40 www.ukstt.org.uk
IMPACT MOLE ‘ STITCHING ’ 41 www.ukstt.org.uk
HDD MARKETS SERVED Renewables Irrigation Clean Water Fibre / Telecom Electricity Gas District Heating Gravity Sewers De-watering www.ukstt.org.uk
HDD Basic Equipment: Drill Rig • Drill Rods Drill Rods • • Drill Tooling (Head / Reamer) • Navigation System • Mixing System • Bentonite / Polymer Mix • www.ukstt.org.uk
HDD RIG TYPES: Mini: Midi: Maxi: Typically less than Typically 30t – 100t Typically greater than 30t Thrust / Pull Thrust / Pull Back. 100t Thrust / Pull Back Back. 100 - 400m, 450mm <400m, 450mm (18”) >100m, 90mm (4”) (18”) Small projects, ‘Line Work’ / Specialist Major projects. lateral / service Applications. work. www.ukstt.org.uk
BASIC COMPONENTS: BORE RIG Fully rotating spotlight Drill Stem magazine Rack & Pinion or Chain drive Semi- automatic clamping facility Diesel motor Anchor impact unit Hydraulics Bore head Track based Undercarriage Remote Stabilisers Operator seat control / control panel www.ukstt.org.uk
DRILL BIT EXAMPLES Dirt/Hard soils Cobble and gravel Soft medium rock Hard rock www.ukstt.org.uk
Soft Ground Directional Drilling • Drill Head rotates • Steering by adjusting orientation of drill head and pushing • Locate with a sonde placed in the head • Deliver bentonite fluid through head www.ukstt.org.uk
Proposed Bore Plan Pilot Bore → ← Pre -Ream with Trailing Rod ← Reaming Pullback with Product
BORE PATH BEST PRACTICE An ideal bore with the least amount of resistance will have gradual, minimal bends for the drill stem and product to go through with finesse. Always drill downhill and pull the product back up hill. This will aid in keeping the bore path full of drilling slurry during the pilot End bore and maintain flow through the annular bore space during product pullback. Beginning www.ukstt.org.uk
Directional Drilling www.ukstt.org.uk
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