zones souterraines – English Translation – Keybot Dictionary

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Ainsi, beaucoup de mineurs utilisent encore des stylos et du papier pour la collecte de données, les vérifications programmées de maintenance et d'autres tâches longues et fastidieuses dans des zones souterraines dangereuses.
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Bringing electronics underground can be dangerous, especially in coal mines where a single spark can ignite an explosion. Therefore, many miners still resort to pen and paper for data collection, routine maintenance checks, and other time-consuming tasks in underground danger zones. To increase efficiency but maintain miner safety, Snively released its new i.roc Mobile Computer. According to Justine Blank, vice-president of Snively, the i.roc’s method of spark-proof encapsulation far exceeds industry standards by reengineering a base digital handheld device that is explosion-proof right at the power source: its lithium-ion battery. It also includes wireless network capabilities, Bluetooth, a Windows operating system, electronic gas detection, and a video/PDF viewer. The mobile computer comes with interchangeable head modules that allow the user to scan data from barcodes and radio-frequency identification (RFID) tags directly into its SafeTracker program or other installed software. “The i.roc is very small and lightweight compared to what older methods of encapsulation would’ve been,” said Blank. The device is the first personal digital assistant to pass North American safety regulations for electronic use in methane-rich environments.
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Bien que l’utilisation du produit se limite actuellement aux zones souterraines déjà soutenues à l’aide de treillis soudé ou de béton projeté, l’entreprise espère que la membrane PCM pourra remplacer les méthodes de soutènement traditionnelles lorsqu’un procédé d’application aura été pleinement adopté pour les zones sans soutien.
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3M has released a polymeric compositemembrane (PCM) spray to complement – and perhaps one day replace – welded wire mesh or shotcrete ground support in underground hard rock mines. “PCM helps retain the rock in place between rock bolts as a method of local ground support,” says James Bradley, technical leader of mining markets. “As the rock moves or fails, PCM is able to capture that rock mass by elongating – or bagging – up to 200 per cent elongation, under loads that exceed 20 megapascals.” This improves on traditional sprayable concrete methods, which Bradley says do not have very high tensile strength. “Concrete can’t stretch.” 3M’s pumpkin-orange polymer spray has an equal or quicker cure time than shotcrete and it also enhances visibility underground, letting workers know which areas have been supported. While the product is currently limited for use in underground areas already supported by shotcrete and wire mesh, once an application method is fully adopted for unsupported areas, the company hopes PCM can replace traditional ground support methods. Bradley says the advantages are obvious: the thickness of PCM spray applied is generally four millimetres, whereas shotcrete applications are two inches thick, which improves underground logistics. “Essentially, one coat of PCM would be the same as four tractor-trailer loads of shotcrete.” – Herb Mathisen