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777 Group won the contract for the final clearance of the 1.5 acre site in Woolwich, which was formerly occupied by Peggy Middleton House, a six-storey office block. The office building had already been demolished and removed, but the deep-rooted reinforced concrete foundations remained. 777 Group was tasked with removing and recycling these foundations. Speed and efficiency were very important for this project as there was a tight time schedule for completion with sizeable financial penalties for overrunning, with the additional complication of working hour restrictions. To help meet the tight schedule, the company moved its two giant Hitachi EX1200 excavators to the site. One of these was equipped with a 7m3 MST bucket for rapidly clearing broken concrete. For breaking the concrete, however, which proved even tougher and deeper than was initially anticipated, the company decided that it needed to equip its second EX1200 with an exceptionally powerful hydraulic hammer attachment. 777 Group knew that Atlas Copco offered a 10 tonne breaker – the HB 10000 – that is not matched by any other supplier and the company also had very positive experience with the smaller Atlas Copco HB 4200 heavy breaker in its fleet. Further attractions of the HB 10000 were its low noise level of 123 db(A) maximum, which was important because of the location of the site’s built-up surroundings, and the one-year warranty, which is extended by two further years on registration. With these factors in mind, 777 Group decided that the HB 10000 was the ideal choice for this challenging project. The Atlas Copco HB 10000 was used to break out over 50,000m3 of reinforced concrete over a 7 week period at the Woolwich site. 777 Group reports that, with the new hammer, the work could have been completed even faster had it not been decided to recycle 25,000m3 of the concrete and reuse it on site to reduce the amount of primary aggregate needed for the new development. “The HB 10000, powered by the EX1200’s very capable hydraulic power pack, was able to break out the concrete at a truly impressive rate,” said Daryl Pearce, 777 Groups’ Business Development Manager. “In fact, there’s little doubt that without it, we would have found it difficult to complete the contract on time. Our HB 10000 was a significant investment, but it’s already proved its worth on this project, and it will undoubtedly be an invaluable asset for us on future contracts.” “We have an excellent working relationship with Atlas Copco,” he continued, “and we benefit greatly not only from the excellent support the company provides, but also from its innovative products that often, as in the case of the HB 10000, simply can’t be matched by other suppliers. Atlas Copco breakers play a very important role in our fleet, and undoubtedly help us to maintain our strong reputation for being one of the UK’s most capable, versatile and reliable demolition contractors.” The Atlas Copco HB 10000 hydraulic breaker is suitable for use with carriers in the 85 to 140 tonne class. It blows up to 380 times per minute and operates at hydraulic pressures between 160 and 180 bar at flow rates of between 450 and 530 l/min. The breaker incorporates PowerAdapt, a protection system that shuts it down if it receives excessive pressure from the carrier, and AutoControl, a monitoring system that allows it to automatically adapt its frequency and power output to match the operating conditions.
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777 Group purchase world´s largest
