The long reach excavator has become a well-used machine concept for demolition works over the last 20 years. These have largely replaced the old fashioned crawler excavator fitted with a heavy steel ball. Training is crucial for the safe use of long reach machines, with simulator systems available that can provide operators with the necessary skills away from the working site.
Long reach excavators allow more controlled demolition works when fitted with attachments such as cutters, breakers or pulverisers. Tilting cabs and camera equipment ensure that operators can see the working area, even when the attachment is at maximum height.
Several key manufacturers are introducing new or improved long reach machines aimed at demolition duties. All of these share features such as ruggedised structures and extra protection for the operator as well as hydraulic systems.
Caterpillar is expanding its range of ultra-high demolition (UHD) excavators with the introduction of the new 330 UHD model. Standard features for the 330 UHD include the Stability Monitoring System with light and sound indicators in the cab on the ultra-high front, as well as the Cat Payload and Cat Grade Control with 2D packages. As with other UHD machines in the Cat range, the new model benefits from heavy-duty cab protection as well as a tiltable cab, providing a better view of the working area.
Also joining Caterpillar’s line-up for the UHD range is the introduction of the Variable Angle Boom option on the 340 VAB, which is designed to cope with demanding demolition sites.
From Develon comes a broader Special Application demolition excavator range with the addition of the new 22.5tonne DX140RDM-7. This new machine shares features with the firm’s three larger demolition models, which range in weight from 31-71tonnes.
Versatility is a key feature of the DX140RDM-7, which is said to offer multiple configurations. The machine can handle a 1.5tonne attachment at 16m, while its hydraulically-adjustable undercarriage allows stability when working at height, as well as ease of transport between sites.
HİDROMEK is introducing two excavators that have been adapted for demolition work. The firm says that these models have been ruggedised to cope with demolition work. The largest of these machines will offer a maximum reach of around 24m while the smaller unit has a maximum reach of around 13m with its 7.7m boom and 3.3m arm.
Both machines are claimed to have superior performance for demolition sites and feature reinforced cabs and windshield protection.
Special application machines for demolition are produced in Germany by KTEG, a joint venture between Hitachi and Kiesel Technology. These include the KTEG 390HR, which is based on a Hitachi ZX350, and equipped with an extendable undercarriage, additional counterweight and tiltable demolition cab. The fixed mounted 23m high-reach boom allows an attachment weight of 3.5tonnes.
The versatile multi-carrier KMC400P can be equipped with various fronts including high-reach demolition, super long front, tele-dipper, earthmoving or crane application units. The Boom Quick Connect system allows a boom change within minutes out of the cab. A robust and durable design, it can handle a range of jobs on demolition environments.
The largest special application machine is the 180tonne KMC1200S, which suits large and challenging projects. It can handle a 3tonne attachment at 51m, 5tonnes at 44m or 15tonnes at 28m. A new main frame and slew ring provide heavy-duty design for durability and reliability.
Komatsu now offers the long reach PC390HRD-11 excavator, developed specially for demolition work. A key feature of the machine is the quick changeover of its K100 boom system. The tilting cab offers high visibility, as well as additional protection measures to cope with the tough demolition application.
Power comes from a Stage V compliant diesel rated at 202kW and the machine can weigh from 45.75-61.8tonnes, depending on the specification being used. For medium reach demolition tasks, the machine can handle a 4tonne attachment, with a maximum attachment weight of 3.35tonnes for high reach work and 2.5tonnes for extended reach working.
Other innovations from Komatsu are the K100 simulator package and three new demolition attachments. The simulator is based on the Komatsu PC490HRD excavator and features the firm’s novel K100 boom change system.
Developed by Oryx Simulations in close collaboration with Komatsu UK as well as expert operators, this simulator replicates the patented K100 technology with high accuracy.
The K100 Human Machine Interface (HMI) allows the operator to perform all boom change procedures. Three different booms in multiple configurations as well as specific scenarios for demolition work are designed and integrated in the simulator. The extra top screen is said to give a realistic view when working with the high reach or extended high reach configuration.
The digital recreation of machine environment offers a safe, convenient, and cost-effective training solution for demolition operators. Following the Komatsu step-by-step training approach, the demolition excavator simulator module guides the operator through the boom change process and demonstrates how to use the integrated K100 HMI system.
With simulated camera feeds and sensor simulation, the operator can practice changing the boom configuration in a realistic environment without danger. A total of nine different training scenarios featuring multiple tools and boom configurations are designed to simulate real-life jobsite situations in full motion, allowing operational techniques and skills to be learned, refined, and improved.
The firm is also broadening its attachment range with the addition of a new static pulveriser, rotating pulveriser and demolition crusher. The new demolition attachments are said to be highly efficienct, offering performance and reliability. Short cycle times are achieved by large hydraulic components that maximise oil flow as well as a novel speed valve. High strength and wear resistance ensure long life through the use of Strenx 960 for the structure, Hardox for protection plates and alu-bronze bushings on the main hinge.
