UEA Trenchless recently completed a 600mm utility tunneling project for Bolte Civil through environmentally sensitive wetlands on the Tomago to Raymond Terrace sewer rising main. The tunneling project consisted of three road crossings, including a 110m crossing of the Pacific Highway and adjacent wetlands as part of a package of under bores in the Newcastle area. Ground conditions presented hard packed sand through to saturated muds with a high water table.
UEA Trenchless has recently taken delivery of an Akkerman Guided Boring Machine (GBM) also known as a pilot tube microtunneling unit. The unit is a 240A which comprises of a single stage frame with a 48” (1,219 mm) stroke cylinder for smooth continuous advancement. When used as a standalone unit, the 240A jacking frame gives UEA the ability to install up to 610mm outside diameter (OD). It can also be used in conjunction with our existing auger boring rigs which gives UEA the capability to install up to 1080mm using this method.
UEA has been installing trenchless sections of steel enveloper pipe to encase DICL water main crossings on the new Rapid Transit Light Rail System under the Gold Coast Highway in Broadbeach. Working for CLM Infrastructure, UEA used a Pilot Guided Boring Machine (GBM) to drill a laser guided pilot hole achieving on target accuracy of less than 10mm. The installation auger followed the pilot bore pushing out the 100mm pilot tube and replacing it with the 550mm steel enveloper pipe. This pilot tube microtunneling method can be used for trenchless installations up to 600mm diameter and up to 80 meters in length depending on ground conditions, and is ideal for critical on grade projects requiring a high level of accuracy.