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Roadheaders are crawler-style excavating devices with a cutting drum placed on the boom that were initially utilised for coal mining and tunnelling projects. Then, models that could be used above ground in lieu of standard excavators were created.
Roadheaders can be equipped with a variety of excavation attachments, including shovels, conveyors, booms, and roof bolters, just like all intricate treaded construction equipment rigs.
Additionally, a roadheader could simply be a boom arm attachment with a cutting drum mounted on another component of building equipment.
The Global Roadheader Market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
A new roadheader was launched by Sandvik for the building industry. The MT520’s modular construction makes it adaptable to a variety of circumstances, and the 8 m cutting height makes it ideal for big road tunnels.
Roadheaders are less frequently used in tunnelling than drill and blast methods or tunnel boring machines (TBMs), but Sandvik claims that under the proper circumstances, they can offer an excellent solution.
Road headers are typically used for medium to long tunnels (500 m to 2.5 km) with a medium cross-section because TBMs would be too costly in these situations, according to the product line manager for the business.
Roadheaders also have a benefit over drill & blast because there is very little vibration, which is important for urban tunnelling projects.MT520 weighs between 115 and 120 tonnes, based on the options and attachments.
The cutter, which can be either an in-line device for soft rock (10 MPa to 40 MPa) or a transverse cutter for material up to 100 MPa, is placed on a telescopic boom. This provides a cutting height of just over 7 m and a width of roughly 10 m in its standard arrangement. (depending on the cutter).
The highest cutting height and width can be increased with an optional extension package, bringing them to 8 and 10.5 metres, respectively. 28 water nozzles on the boom cool the cutter head’s picks, and a high-pressure water compressor can be used to increase the spray pressure from 10 to 30 bar.
A loading table with an 840 mm wide centre conveyor and spinners on either side to feed material into it are located in the front of the MT520.
