No more “knocking down”Published 15/9 at 11:03
We used to call it ‘knocking down a building’ when demolishing a structure. Now it is less and less common to see a building being knocked down with a hydraulic breaker. A whole range of demolition attachments is replacing breakers. PDi’s Jan Hermansson reports.
The reasons are many as breakers cause more vibration, more noise; more dust and the structures are now more complex, which calls for other types of tools. Also much of the separation of materials and the recycling is often done on site and is possible with current hydraulic demolition attachments.
A new player in the demolition attachments business is the Finnish manufacturer Green Attachments, located in Lahti and founder by chief executive Benjamin Pitkäsalo. Although the company was formed quite recently the employees have a long experience from developing and manufacturing demolition attachments and also hydraulic breakers.
Green Attachments is part of the Finnish Cleantech group of companies and has created a range of solutions for demolition and recycling. With a huge experience of designing and selling different attachments, the company is building a network of distributors in Europe and providing fast deliveries for international customers. The company has an OEM range of attachments for excavators and wheel loaders, including hydraulic breakers, demolition and sorting grapples, demolition crushers and pulverisers. All products and spare parts are available on the company’s web based store. The core value of the company is to boost green values in a sustainable way, recycling can be both productive and efficient to the client and to the environment.
Two examples of new products are the RV rotating pulverisers and the GR demolition grapples. Yellow line RV hydraulic rotating pulverisers have been designed for primary and secondary demolition applications. The Yellow RV pulverisers are able to perform all demolition tasks and separate reinforcement steel at ground level. RV hydraulic rotating pulverisers have been manufactured entirely from Hardox 400 and have a regenerative circuit valve for fast jaw movement. Cylinders are reversed to protect the piston rod.
The Yellow line GR grapples have been designed for all demolition and recycling applications. They have a hydraulic motor for positioning and many jaw options.
Atlas Copco’s new Concrete Buster CB 2500 is for use with high reach or long front carriers. With its jaw opening of 1.1m and weighing 2.6t, the CB 2500 makes light work of cutting steel girders and concrete at extreme heights. Exerting a cracking force of 100t the CB 2500 can tackle concrete walls to a thickness of 900mm.
Another new tool is the SC Steel Cutter attachment for demolition and use in scrap yards. The jaw is equipped with an auto-guiding system, ensuring material is forced deep into the jaw where the cutting power is greatest. All SC Steel Cutters are fitted with replaceable blades. The attachment is suitable for use with carriers weighing from 16t to 110t, depending on whether it is stick or boom mounted.
Atlas Copco has also released the new CombiCutters CC 3700, CC 5000 and CC 7000. These new attachments offer a combination of high crushing force, short cycle times and high dependability. The most notable design changes include redesigned suspension for the body, which is now in one piece, fewer parts in the body, and improved jaw support. Plates are welded in the support area and broader bushes give more surface area.
The Italian manufacturer Indeco has improved its IFP fixed and IRP rotating pulveriser ranges. The new models have interchangeable teeth on the mobile jaw for optimum penetration of the material being demolished.
The Indeco IMP multiprocessor has been redesigned and given a more robust body. Its maximum jaw opening has been increased and jaw geometry improved. The jaws have been updated to make it easier to dismantle and replace and offer better grip. Its pulveriser version now has interchangeable teeth. The shear version now has reversible and interchangeable cutters, and a dual-profile piercing system found on the ISS Series Indeco shear. The range has also been modified and extended.
The new IMG grabs have evolved from the previous IDG demolition grabs. On a single housing, using the same hydraulic circuit both for opening, closing and rotation, the new IMG grabs are now made in five different versions for five different specific jobs in various sectors:
IMG S Sorting Jaws are tools for sorting demolition waste materials, clearing stony ground, and dredging.
IMG D Demolition Sorting Jaws - Ideal for light demolition jobs, such as demolishing wood and brick structures, it can also be used for recycling and recovery of waste materials.
IMG 3 + 2 Material Handling Jaws - Designed for handling large objects for scrap, the force transmitted by its hydraulic rotation system to the interlocking teeth provides a safe powerful grip.
IMG L Loading Jaws - The geometry of the jaws is designed for maximum payload, making them ideal for a variety of applications.
IMG T Timber Jaws - Designed to combine maximum gripping force with lightweight, facilitating the handling of large tree trunks in forestry operations.
All the silent demolition and material handling products have the same rotation mechanism, which will now be used on all future rotating products.
The Japanese hydraulic attachment manufacturer Okada used the N-EXPO show in Tokyo in May to launch the TS-WB2400V hydraulic crusher. It is suitable for over 150t class excavators and will provide contractors with option of crushing very large and strong concrete structures.
The maximum jaw opening is 2.4m, and the twin cylinders maintain crushing force until the jaws are completely closed. A high oil flow speed valve installed on each cylinder helps to achieve fast cycle times, while a steel cover offers protection for the piston rod. The TS-WB2400V hydraulic rotation helps operator’s manoeuvrability to set it on the structure to be crushed. Cutter blades on the jaws process rebar while crushing concrete structures.
Italian crusher bucket manufacturer MB Crusher had added the latest version of the BF 70.2, which is more productive due to a restyling and improved resistance to the most extreme working conditions. A new integrated greasing system renders it more functional and operational.
The BF 70.2 S4 has a load capacity of 0.66m3 and weighing 2.3t is suitable for machines with an operating weight of over 14t. It is easy to install and works with an oil capacity of 140litres/min, pressures of 220bar and counter-pressures of 10bar.
The Finnish manufacturer of crushing bucket Viper Metal has extensive experience with demolition attachments. Viper buckets provide screening and crushing solutions for earth moving, demolition, and recycling and waste management companies.
The comprehensive range of screening buckets is available for excavators, wheel loaders and skid steers in the 2t to 50t class. 3D screening technology is utilized contributing to more productivity and improvement in screening quality. All Viper buckets are made of Hardox and are typically 20% lighter than conventional screening buckets.
New rotating crushing technology is applied in Viper patented crushing buckets, which feature high crushing capacity. Using the VPCH-21 crushing bucket, a three-storey concrete block building was demolished to rubble in just 50h. A typical jaw crusher would normally require a month.
At the German show Steinexpo Rammer demonstrated the latest version of its largest hydraulic hammer the Rammer 9033. The new model replaces the Rammer 7013 and benefits from a number of key changes and improvements, many of which have been proven in smaller Rammer hammers. These include a 20% wider carrier weight range and a 22% higher input power, which significantly increases impact rate and productivity compared to its predecessor.
These improvements have been achieved by equipping the new Rammer 9033 with many of the key features recently applied to other models. ”Our engineers have applied lessons learned on other hammer models to place this Rammer hammer at the very top of its class,” said Rammer general manager Rafa López.
Weighing 7t, the Rammer 9033 is suitable for carriers in the 60t to 120t operating weight range. Impact rate on the long stroke setting rises from a maximum of 450blows/min to 520blows/min, while maximum oil flow increases to 460litres/min compared to 400litres/min on the Rammer 7013. Input power is up 22% to 138kW.
Stroke length and Idle blow protection can be adjusted to allow the Rammer 9033 to be matched to individual applications. The long stroke setting uses a lower blow frequency for optimum breaking in hard materials, while the short stroke setting delivers higher blow frequency, which is ideal for softer materials. The Idle blow protector on/off selector allows operators to adjust the working mode to protect against idle strokes.
The 9033 utilizes long-life, high-tension Vidat tie rods for improved reliability and lower operating costs. Simple, reliable rubber rings lock the tool-retaining pins, while the surface of the lower tool bushing provides longer tool life. The Rammer 9033 also becomes the final model in the Rammer Large Range to benefit from the addition of the Ramvalve overflow protection system.
The Ramvalve monitors the oil flow through the hammer. If the oil flow exceeds the pre-defined setting, the valve adjusts the flow to a very low level and drops the hammer’s impact rate. The Ramvalve resets after the hammer re-starts with a correct oil flow. This highly effective system provides excellent protection against accidental overflowing and overpressure, enhances the hammer’s reliability, and offers improved protection against oil spills.
The Rammer 9033 is offered with three greasing options. These are a centralized manual option, carrier-mounted Ramlube I automatic greasing or Ramlube II, which utilizes a cartridge mounted on the hammer to automatically deliver lubrication. It also comes equipped with the Ramdata II service indicator that allows operators and service personnel to monitor and log vital service and maintenance information.
Rammer has also announced the introduction of its Performance Line of hydraulic hammers. The new line, initially comprising four models, is designed to allow first-time customers and markets to enjoy the Rammer experience but at optimized investment.
The first Rammer Performance models will be the R18P, R25P, R35P, and R45P. An additional medium-sized model will follow early in 2018 with a full range of small Performance Line models scheduled to follow shortly after.
The R18P is a 1.24t hammer suitable for carriers in the 15t to 23t operating weight range. The larger R25P is suitable for carriers from 20t to 29t and weighs 1.65t. Designed for carriers in the 27t to 40t, the R35P is a 2.32t, while the 3t R45P is aimed at carriers from 36t to 53t.
Each of the new Performance Line hammers benefit from low operating noise levels, which makes them suitable for most applications including inner city and urban projects. The new models are in addition to the company’s comprehensive range and do not replace existing models.
The Spanish breaker manufacturer Tabe has announced the new breaker MT 80, which weighs 8t and is without through bolts.
The MT 80 has an auto lube system and is equipped with a frequency variation system allowing customers to choose the best frequency for each kind of ground or material. It also has an underwater system allowing the breaker to work safely and easy in all kinds of underwater applications.
The demolition and removal of the Zeilgalerie shopping centre in Frankfurt am Main, Germany, was completed in the summer of 2016 by contractor Antal Abbruch and Baumanagement using a mixed fleet of Brokk remotely controlled robots and various Darda attachments.
A Darda MultiCutter MC200, two Darda CC420 steel shears and a CC700 S, two Darda CC520 concrete crushers and a CC700, mounted on four Brokk demolition robots, one Brokk 100, two Brokk 160s and a Brokk 260 were the key machines on this major project. The MC200 Multi Cutter proved a success cutting pipes, cables, metal brackets and struts, air-conditioning ducts, steel supports, railings, installation rails, drywall frames and panelling.
The location of the Zeilgalerie between two department stores and a subway tunnel running alongside the building, made the project extremely challenging. For Antal the combination of Brokk demolition robots and Darda attachments proved to be the ideal demolition team. Antal had also considered also using concrete saws, but these would have taken longer and been uneconomic.
Seismographs were set up to monitor the vibration intensity, which had to be kept to a minimum. The Brokk robots and the Darda attachments met this requirement. "These machines can also be operated very accurately via remote-control, so that demolition work can be carried out in a highly controlled way. Their low surface weight also results in safe surface loads, which is always a big issue," said Antal general manager George Antal.
The electro-hydraulic demolition robots with their quiet electric motors performed the demolition with low noise. Similarly the Darda concrete crushers and the Darda Multi Cutter were very quiet.
The Brokk robots, and Darda equipment, are more compact and lighter than conventional demolition machinery, were able to complete the demolition without any complaints and ahead of schedule.
A time laps video of the demolition project is available on the Aantal Abbruch & Baumanagement Youtube Channel.