THE MAGAZINE FOR THE DRAINAGE,WATER &WASTEWATER INDUSTRIES
MAIN FEATURE
required,with the auger both cutting the spoil to enlarge the bore and removing the spoil back to the start shaft for disposal. As this is an open face operation the systemis usually operated in groundwith limited groundwater levels. Having opened the bore is to the correct dimensions the product pipe is then jacked into the bore expelling the auger and auger casing at the reception shaft at the far end of the drive. GuidedAuger Boremachines are currently capable of installations, dependent themanufacturer andmachine type, fromabout 100mm up to about 1,700mmo.d. Themachines are often operated fromwithin the start shaft although they can inmany cases be operated fromoutside of the shaft by remote control. Developments around the capabilities of guided augermachines have meant that to significant extent they have in themselves becomemore like the traditionalmicrotunnellingmachines in terms of diameter of installation capacity. Thesemachines nowoffer inmany cases the option to install pipelines using two-pass or possibly even single passmethodologies depending on the circumstances and this is at diameters that competewellwith themore traditionalmicrotunnellers. For example, there is nowthe option to use the guided auger rigs, many ofwhich providemuch higher jacking tonnage capacity than earlier rigs, to bore not only through clay conditions but also through harder formations and even solid
rock.The systems are designed to use specialist cutting heads for thesemore arduous circumstances.
MACHINE SUPPLIERS
Herrenknecht –The family businessHerrenknecht delivers cutting- edge tunnel boringmachines for all ground conditions and in all diameters, ranging from0.10 to
19meters.More than 850
FOLLOW US
HerrenknechtUtilityTunnellingMachines are in operation around the world constructing or layingwater andwastewater systems, gas and oil pipelines, aswell as conduits for electricity and telecommunications. Machine technology and customer-specific services optimised for projects andmarket requirements are the basis formaximum reliability. Nowadays,microtunnelling projectswith long distances orwith curves along the alignment arewell
established.The guidance systemenables precise excavation of curved sections, nomatter if horizontal, vertical, S-curves or clothoids are
required.Newtechnological developments enlarge the range of options. For theThirlmere LinkMains project,CastleriggDrive, the jobsite crew ofWard&BurkeConstruction Ltd (seeContactors section below) showed an outstanding performancewith aHerrenknechtAVND2200 when realising the longest pipe jacking drive in theUKwith a length of 1,240m.With a performance of up to 29mper day and 163maweek, up to 60mbelowthe surface, the sectionwas an importantmilestone paving theway for the twinwater pipelines being laid between Thirlmere reservoir andWilliamsgate for clientUnitedUtilities. In December 2019, the teamreceived theNCETunnellingAward, categoryTunnelling Project of theYear. For ScottishWaterV JDonegan (again see contractor section below) utilisedmicrotunnelling to install a combined sewer overflowsystemin the town centre of
Paisley.The aimwas to substantially reduce the frequency of spills fromthe sewer network into the Espedair Burn and WhiteCartWater in stormconditions, this being part of a greater initiative inGreaterGlasgowto improve riverwater quality, the natural environment and tackle
flooding.ThreeHerrenknecht Pipe Jacking machines have been usedwith outer diameters ranging from1,220 to 1,810mmand drives up tomore than 1 kmlength. E-Power Pipe®, the newmethod for environmentally friendly
August 2020 | drain TRADER 9
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