Trenchless Technology...Benefits of Trenchless Technology: Reduces excavation Less disruptive Makes...

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Trenchless TechnologyA 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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Open up the possibilities…

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01926 513773

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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 operators

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

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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”) outside 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 HeadFixed Head

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New InstallationImpact Moling

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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

StabilisersOperator seatRemote

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-reamingTarget surface A = B = CSame surface means same Torque/Horsepower and same speed

d = final hole diameter (mm)d = final hole diameter (") n = amount of reaming stagesm = number of ream

ABC

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

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PIPE CENTRIC PLANNING & AS BUILT

Bore planning computer

software design tools will map

out 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