The new Wirtgen WRC 240(i) rock crusher breaks coarse rocks in-situ, as found in hand-packed pavement layers (e.g. Telford bases) or stony soils, and produces a homogeneous mix in a continuous process. The machine features a working width of 2,320 mm and a working depth of up to 510 mm, delivering an output of up to 600 t/hr.
The WRC 240(i) expands Wirtgen’s portfolio of wheeled soil stabilisers designed especially for the processing of stony ground. In addition to the crushing of rocks and stones with an edge length of up to 300 mm and a compressive strength of up to 200 MPa, the machine can add cement and water in the same pass, for instance in the preparation of base layers. Here, the cement is pre-spread with a binding agent spreader and the water required is sprayed into the mixing chamber of the rock crusher via the machine’s Varioinjection bar.
The WRC 240(i) can also be used for soil stabilisation. For this application, the pre-spread binding agents such as lime or cement are mixed into the existing soil with insufficient bearing capacity, then it is transformed in-situ into a high-grade construction material and deposited evenly behind the machine. The main task of the WRC is the granulation and mixing of a variety of soils, courses and layers to produce a homogeneous final product in a continuous process. As opposed to the removal and replacement of material, the processes here are characterised by shorter construction times, conservation of resources and lower CO2 emissions.
The rugged and resilient crushing and mixing rotor with toolholders developed especially for crushing applications with the HT18 provides optimal results when working in stony ground. The tools are fitted with large, impact-resistant carbide cutting edges and the holder bases are protected by wear-resistant protective elements made from high-tensile steel. This ensures high machine utilisation rates and process reliability in demanding applications. The rotor is driven via a transmission developed especially for the WRC that enables the realisation of high rotor speeds.
In order to ensure long-term resistance to the enormous stresses encountered when crushing rocks, the rotor housing of the WRC 240(i) is lined with abrasion-resistant wearing plates made from extremely tough high-tensile steel. This guarantees a longer service life and increases the overall stability of the housing. The entire mixing chamber is also lined with these hard-wearing plates, which can be individually replaced if and when required.
Furthermore, the WRC 240(i) offers several setting options that enable the achievement of the desired grain size and consistently uniform distribution in a wide range of applications. Nine rotor speeds, a variable crushing stage, exchangeable screens with a range of clear mesh sizes and adjustable distance from the rotor, adjustable rotor plate pressure and the machine advance rate enable the configuration of the machine to meet the needs of actual site conditions and the desired application.
With precise, automatic steering, the satellite-based AutoTrac system helps the WRC to achieve greater process efficiency and in turn a high degree of environmental compatibility. It steers the machine accurately within tolerances of a few centimetres on the basis of a previously calculated reference strip and a specified overlap of adjacent strips, resulting in consistent utilisation of the machine’s ideal working width. The Wirtgen Performance Tracker (WPT) registers all relevant location-specific working parameters to provide a comprehensive database for the analysis and documentation of the construction site.