Trenchless Technology A review of methods and latest updates - - PowerPoint PPT Presentation

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Trenchless Technology

A review of methods and latest updates Matthew Izzard (Business Development Director – Tracto Technik UK) (Vice Chairman UKSTT)

Who are UKSTT?

United Kingdom Society of Trenchless Technology International Society of Trenchless Technology BSI & International Standards Representation

What we do:

Annual Awards & Gala Dinner Biennial No Dig Live Exhibition National Awareness Presentations Technical & Masterclass Sessions University OutReach Program Regional Roadshows

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Benefits of Trenchless Technology:

✓ Reduces excavation ✓ Less disruptive ✓ Makes use of existing assets ✓ Faster installation rates ✓ Safer for public and contractors ✓ Environmentally beneficial

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Safe Excavation Techniques:

Increasingly used to minimise excavation as much as possible, minimising reinstatement and ensuring

• perators

safety as much as possible.

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Coring:

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Vacuum Excavation:

Courtesy: Mammoth MTS

Distance and depth not an issue with a vacuum system instead of a suction unit.

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Vacuum Excavation:

Courtesy: Mammoth MTS Courtesy: Mammoth MTS Courtesy: Mammoth MTS

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‘Core & Vac’

Use of keyhole excavation coring and vacuum excavation

Benefits:

• Smaller footprint.
• Reduced reinstatement.
• Many tasks can be performed

including repairs and fittings.

• Avoids damage to tree roots

and other apparatus.

4 hours vs. 7 days www.ukstt.org.uk

Key Hole Technology:

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FTTH TRENCHING TECHNOLOGIES

 Plowing  Trencher  Plow/Trencher Combo  Rockwheel  Microtrencher  Minitrencher  Productive equipment  Soft ground to rock conditions  Different technologies matching

different conditions

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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

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PLOWING

 Vibratory plow attachment  Plow blade

PULL BLADE CHUTE BLADE COMBO BLADE RIGID BLADE SINGLE-PIVOT BLADE DOUBLE-PIVOT BLADE

Custom-made blades matching project Large number of options to meet exacting needs

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PLOWING

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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

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TRENCHING

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TRENCHING: CUTTING EDGE

 Different cutting tool setups matching ground conditions

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

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ROCKWHEEL

 Rockwheel attachment  Rockwheel cutter segments  Optional trench cleaner

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ROCKWHEEL

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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.

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• 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

MICROTRENCHING: VACUUM

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• 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

MICROTRENCHING: SIDE DISCHARGE

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• Spring-loaded, flex pivot design

aids steering, particularly around curves

• Offset capability up to 5 cm(2”)
• utside the right rear tire
• Two-stage lift and level design

keeps attachment flush with the surface to maximize cutter wheel engagement and vacuum

MICROTRENCHER ATTACHMENT

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MICROTRENCHER WITH VACUUM

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MICROTRENCHER: SIDE DISCHARGE

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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”)

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NARROW TRENCHING: 50MM (2”):

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FTTH INSTALLATION

 Small footprint equipment  Soft – compacted ground conditions

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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

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Impact Moling / Thrustboring

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IMPACT MOLING ACCURACY

Moving Head Fixed Head

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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 IMPORTANT: Always check plans and check with locating equipment prior to boring Average of 10% bore shrinkage with each size of Grundomat (ie: 45mm installs max. 40mm, 145mm installs 125mm etc)

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PIPE OR CABLE INSTALLATION

• Pull in direct
• Reverse ‘mole’
• Direct P.E.

(Not clean water!)

• Direct uPVC

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IMPACT MOLE “STITCHING”

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IMPACT MOLE ‘STITCHING’

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HDD MARKETS SERVED

Gas Clean Water Electricity Renewables Gravity Sewers De-watering Fibre / Telecom Irrigation

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District Heating

HDD Basic Equipment:

• Drill Rig
• Drill Rods
• Navigation System
• Mixing System
• Drill Rods
• Bentonite / Polymer Mix
• Drill Tooling (Head / Reamer)

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HDD RIG TYPES:

Midi: Mini: Maxi: Typically less than 30t Thrust / Pull Back. Typically 30t – 100t Thrust / Pull Back. Typically greater than 100t Thrust / Pull Back Small projects, lateral / service work. ‘Line Work’ / Specialist Applications. Major projects. >100m, 90mm (4”) 100 - 400m, 450mm (18”) <400m, 450mm (18”)

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BASIC COMPONENTS: BORE RIG

Drill Stem magazine Fully rotating spotlight Rack & Pinion or Chain drive Diesel motor Hydraulics Track based Undercarriage Stabilisers Operator seat Remote control / control panel Bore head Anchor impact unit Semi- automatic clamping facility

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DRILL BIT EXAMPLES

 Dirt/Hard soils  Cobble and gravel  Soft medium rock  Hard rock

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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

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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 bore and maintain flow through the annular bore space during product pullback.

End Beginning

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Directional Drilling

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REAMING

Pre-reaming Target surface A = B = C Same surface means same Torque/Horsepower and same speed d = final hole diameter (mm) d = final hole diameter (") n = amount of reaming stages m = number of ream

A B C

Pre ream diameter(mm) = m x final hole diameter(mm)2 n

Length Overcut 0 > 50m/150ft 20% 50m/150ft > 100m/300ft 30% 100m/300ft > 300m/1000ft 40% > 300m/1000ft 50% Condition/product ROCK 50% STEEL 50% Hole size related to installation length

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REAMER / HOLE OPENING

 One function of a back reamer is to enlarge the bore hole to a

size large enough to allow for the installation of the required product.

 The second objective of the reamer is to mix the cuttings from

the back reamer with the drilling fluid to create a slurry that can be displaced to the side of or discharged out of the bore path to allow room for the product.

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DRILLING FLUID REQUIREMENTS

• Thixotropic behavior

➢ Fluid when in motion ➢ Solid when not in

motion

• Transport of the cuttings

(viscosity)

• Prevent fluid loss in the

formation (filter cake)

➢ Unstable formation ➢ Less fluid for transport ➢ Hole stabilization

• Keep the cuttings in

suspension (gel strength)

• Cutting encapsulation

➢ Prevent clay balling www.ukstt.org.uk

PIPE CENTRIC PLANNING & AS BUILT

Bore planning computer software design tools will map

• ut the bore path as well as

provide a rod-by-rod navigation plan according to the soil, elevation and utility data inserted.

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Today & Tomorrow…

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Thank you for your time…

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Matthew Izzard T: 01234 342566 M: 07778 888844 E: matthew.izzard@tt-uk.com

www.ukstt.org.uk www.tracto-technik.co.uk