In addition to the crushing of rocks and stones with an edge length of up to 300 mm and strength 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 machine can also be used for soil stabilization. For this application, pre-spread binding agents, such as lime or cement, are mixed into the existing soil with insufficient bearing capacity, which is then 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 help conserve resources and lower CO2 emissions.
Crushing and Mixing Rotor
The rugged crushing and mixing rotor with toolholders developed for crushing applications with the HT18 enables 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 promotes high machine utilization rates and process reliability in demanding applications. Edge protectors reduce wear on the edge ring segments of the rotor. The rotor is driven via a transmission developed for the WRC that enables realization of high rotor speeds.
Armored Rotor Housing
In order to ensure long-term resistance to the stress encountered when crushing rocks, the rotor housing of the Rock Crusher is lined with abrasion-resistant wearing plates made from high-tensile steel. This provides overall stability of the housing. The entire mixing chamber is lined with hard-wearing plates, which can be individually replaced as needed.
Homogeneous Grain Sizes
The WRC 240(i) offers several setting options for desired grain sizes and uniform distribution in a 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.
Digital Assistance Systems
By enabling automatic steering, the satellite-based AutoTrac system helps operators steers the machine within tolerances of a few centimeters on the basis of a previously calculated reference strip and a specified overlap of adjacent strips. This enables consistent utilization of the machine’s working width. The Wirtgen Performance Tracker (WPT) registers all relevant location-specific working parameters to provide a database for the analysis and documentation of the construction site.