Securing the Roadway

Securing the Roadway after Blasting with the Paus Scaler 853 S8

Barring down with scaling bar from the round of advance

Paus Uni 50 Scaler for scaling by peeling. The hydraulically mobile tool can also be used to pry out blocks of rock. It operates along direct mechanical lines similar to a worker using a crowbar. The application of such machines is thus usually restricted to soft types of rock, especially potash or salt mines where frequent reworking can also be required.

Paus Scaler PTS700; for special applications depending on on-site conditions, large machines with heavy hammers are also used to combine tasks such as scaling and rock crushing. The service weight here is 31 t with an overall length of 12.5 m for major heights up to 10 m

Paus 853 S8: compact dimensions and low service weight cater for manoeuvrability and flexibility. Its great mobility increases productivity and thus represents a major advantage over scaling with a crawler-mounted vehicle

Telescopic boom 853 S8 + NPK GH-2S

Clearing shield, a protective plate protects the hydraulic hoist

Switching chart for the hammer supply system

“Intelli Scale” control system

Display for central control system

Underground blasting operations naturally cause loosening of the rock. This entails dangers with loose splitters of material, which can fall down especially from the roof. The roof and the ribs are worked to counter this danger. Traditionally this was carried out by hand with the rock being tackled with a scaling bar. Based on the noise and the appearance of the rock the experienced tunneller or miner can identify the places, which are potentially dangerous and remove loose parts with the scaling bar. This report presents a method which allows scaling to be carried out mechanically from a safe working position.

1. Barring down and Scaling – important for Securing the Excavation

Scaling or barring down the roof and ribs underground largely serves to secure the excavation following blasting and for maintenance. It thus represents an essential working step for safe tunnel driving and production in mines. This work calls for a great deal of experience in handling the tools that are applied – both by hand and mechanically – and at the same time depends on good geological and rock-mechanical knowledge. An experienced tunneller or miner does not simply rely on his sense of sight in this respect; his sense of...