GROUND SUPPORT & ROCK REINFORCEMENT context RBG is currently used in several mines around the globe , providing early safety for miners and reducing the cycle times significantly . TamPur RBG is also available in varying grades to suit both an automated or manual injection process and to allow for local ambient and rock formation temperatures . Finally , an additional specific product , TamPur 117 , is designed for cavity filling in hard rock mining , goff filling in coal workings , to general void filling for tunnelling and civil engineering projects . It reacts within seconds to form a high , expansive , lightweight foam , which is economical , non-toxic , fire resistant and user friendly .
CarboThix was deployed as part of Epiroc ' s pumpable resin bolting solution for Vale ' s Voiseys Bay operation
involvement from all parties ( resin and bolt supplier , rig supplier , mine operator ) when new technologies such as UniPass are first introduced at the mine , as the use of bulk two component resins for fully mechanised rock bolting is still relatively new in the industry and the combination of rig set-up , resin properties and mine conditions must be appreciated to ensure a successful start-up and longer-term adoption .” Minova ’ s 20 years of development , testing and monitoring experience ( across mechanical , environmental and health & safety topics ) it argues provides the required confidence for a successful launch for what is gaining traction and further acceptance in the underground ground support sector . Minova predicts growth in the use of fast-setting resins to provide immediate support of bolting systems , as witnessed by the introduction of several newer products into the market .
Assinder adds : “ The benefits of super-fast set times , immediate support , creation of an inert and stable polyurea grout , and the ability to fill fractures around the drill hole annulus , mean that bulk resins are predicted to have an exponential growth in acceptance in underground mine and tunnel operations , especially as operations continue to mechanise and go deeper into more highly stressed rock .” avoid reflux and allow sufficient time for installing solid rock bolts . It is especially effective in vertical bolting applications , and can also be injected through SDA ’ s ( Self-Drilling Anchors ). There are three versions of TamPur RBG available , Slow , Standard and Fast set , in order to meet the requirement for different application conditions and processes . Originally designed for standard length SDA grouting in broken ground along with manual injection for solid bolts , Normet ’ s pumpable resin offering has extended to cable bolting along with longer connectable SDA ’ s and Normet ’ s connectable SDDB ’ s ( selfdrilling dynamic bolts ), either delivered through an automated or manual process . Over the past few years , Normet has worked to develop pumpable resin to OEM ’ s requirements and for use with extended hollow bolts taking into consideration the longer resin open time requirement , delivery process and varying ambient conditions . These products now compliment the full range of ground improvement resins that Normet offers . In this
Foams for rapid safety in coal mining
Weber Mining says it continues to produce efficient and reliable solutions for its mining and tunnelling partners . Its MARIFLEX LS1 filler foams are used to fill the dents in the ceiling in a short time and to make the working area safe . With its high blistering rate , the MARIFLEX LS1 product provides the ability to fill quickly and safely with the use of a small amount of product .
MARIFLEX is one example of a phenolic foam , which are high expanding , two component foams designed for rapid filling of large voids and cavities . These foams have a very good resistance to fire and fulfil the standards in all countries for a use as cavity filler in underground coal mines . The benefits of this technology are time-saving and safety increase compared to classic filling . Designed in the 1980s especially for cavity filling when roof collapse in the longwall , the technology has been improved by various expansion ratios , safer chemistry and longer shelf life of the components .
Another example for larger cavities is ROCSIL , where complete cavity filling is assured . This allows for the containment of the surrounding strata in exposed cavities , thus containing further self-mining or falls of ground . Due to the expansion of the foam , and assurance that the
Normet and Rock Bolt Grout
Normet ’ s TamPur RBG ( Rock Bolt Grout ) is an injectable , two-component , silicate modified solvent-free , polyurethane grout . RBG has been formulated for securing and sealing rock bolts in mining and tunnelling applications . It is designed to instantly thicken after injection retaining a thixotropic nature within the rock bolt hole to
Normet ' s TamPur RBG is available in varying grades to suit both an automated or manual injection process
International Mining | AUGUST 2022