The quality and reliability of Makita could be yours with this three-mode combination, 26 mm (1 inch), 8000 watt hammer drill. The HR2610 delivers up to 4600 impacts per minute, with capacities from 13-32 mm, depending on the drilling material. Weighing just 2.9 kg, the HR2610 comes with a side grip and depth chuck; its RRP is $469 plus GST.
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What is the HR2610's capacity for drilling concrete?
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Entries close 8 June 2012. The winners will be notified by email, and announced in the June/July 2012 edition
April May Cover Story:
Reopening the Waioeka Gorge
The Waioeka Gorge connects the eastern Bay of Plenty to Gisborne along State Highway 2 and is renowned for its picturesque landscape. The state highway is also one of the longest and most challenging roads ever constructed in New Zealand history. Officially opened on 15 December 1962, the Ministry of Works spent three years converting the old gravel road built by early settlers into a two-lane sealed highway.
An understanding of the geography and geology of the
Waioeka Gorge illustrates the difficulties the NZ Transport
Agency faced when trying to reopen the state highway
following large slips in early March.
The project was both difficult and dangerous. Almost 40 km of the route comprises near-vertical terrain, and a significant amount of rock-blasting was required, with work on steep and unstable slopes. Rockfalls were common. During the course of construction, three men tragically lost their lives, and a monument in the gorge is a reminder of the toll of the project.
Large-scale failure
Today, SH2 is still exposed to the same challenges faced when the two-lane highway was constructed. The steep slopes comprise deformed and folded rocks of varying kinds, typically sandstone and mudstone, and are interspersed with a number of northsouth directed faults which ultimately control the stability of the hillsides. The rock face is very fractured, consisting of crushed and weathered greywacke and argillite.
The initial large slip occurred on Friday 2 March, 50 km inland from Opotiki near the settlement of Oponae. Approximately 10,000 cu m of soil and vegetation fell onto SH2, pushing with it the concrete barriers that protect the road from small rockfalls. The road was temporarily closed to allow for the removal of debris and repairs to be made, and geologists determined that a series of comparatively minor slips had occurred.
However, over the following day, the block falls increased in magnitude and frequency, removing the localised stability of the slip face. The steep vertical angle of the slope and the fact that the base of the slope had been stripped considerably by the minor slips led to a rapid and sudden large-scale failure of the slip face, and 100,000 cu m of slope material crashed down onto SH2, effectively severing the only direct transport connection between Gisborne and Opotiki.