Side by side for demolition
By Steve Ducker22 February 2021
Allu has launched crusher buckets for 10 to 38 t machines adjustable for 13 different discharge sizes, alongside the screening buckets it has produced for the past 30 years
The Finland-based manufacturer said that placing two solutions side by side provides demolition sites with increased capacity, saving both time and money.
A customer in Finland became the first to test the crusher and screener side by side for demolition. A sieve and crusher bucket chain for handling powdered concrete, and at this site, 85% percent was screened and also partially crushed through a screener crusher and only the excess very hard material was crushed with a crusher bucket.
“The demolition concrete was treated after pulverisation with two Allus” said regional sales manager Ilpo Ellonen.
“The excess obtained from the screener crusher bucket visible at the front was crushed to a 90 mm (3.5 in) fraction with a crusher bucket. Thus, a total of about 5,000 t passed through two buckets. The demolition of two residential buildings of two storeys each produced a total of about 5,000 t of concrete. The maximum fraction size achieved in the pulverisation was 400 mm, which is a maximum good input feed size for the Allu crusher bucket. The jaw is reversible, which enables fast and easy recovery of from possible blockages.”
The demolition phase took three weeks. At the time of the visit, between 600 and 700 t of concrete waste were still untreated. In the fourth week, there was still a run-off of crushed concrete for use at the bottom of the forest road. The purpose of the entire process is to recycle concrete waste at Allu into stone aggregate for reuse, which replaces the need to use virgin aggregate providing an environmentally sustainable solution.
Allu said the throughput of material from the screener crusher bucket is many times higher than with the crusher bucket, so the goal is to get the fines out as accurately as possible by screening so that the amount of material to be crushed is kept to a minimum.