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Gemstones, Minerals & Fossils
Gemstones and Minerals
How to fasten the ladder to the side of a shaft?
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<blockquote data-quote="geowork" data-source="post: 647651" data-attributes="member: 8036"><p>Similar to what you and Dihusky have said. It is important to have the ladder a sufficent distance off the wall to enable your feet to be securely placed on the rungs. As the ladder is already fabricated and in place, following is an option used on the Central Queensland Gemfields. Use 10 or 12mm threaded bar, pointed at one end, at least 300mm long. Don't make them too long or too thick, as it does take some effort driving them in, while standing on the ladder. Two bars on each selected rung, placed towards the sides of the ladder. Drill holes through the selected rungs or better, weld tabs on the underside and drill holes through those. On each bar have a nut/washer tightened on each side of the rung/tab after the bar is driven into place. This keeps the ladder both a sufficient distance off the shaft wall and fixed firm. Obvioulsy, the inside nut/washer needs to be placed and loose on the bar before starting to drive the bar in.</p><p></p><p>All of the above assumes the top of ladder fix is capable of supporting all vertical loads. After a bit of time, natural metal corrosion and soil/clay/bar reactions will form a plug that won't pull out of a solid wall. In my recent shafts I have succesfully used 300mm landscaping screws driven in with an impact driver (easy!). But this would depend on the shaft wall competency. Also, the ladder was prefabricated with "spacers" to keep the ladder off the shaft wall.</p><p></p><p>For the shaft collar, it really depends on what the surface strata is and how weathered or loose. Water flow and seepage is the important issue here. Build it up on the surface so no water flows or pools close. A bit of concrete or mortar slurry around the outside collar base is a good thing, before infilling. maybe also consider the landscaping screws.</p></blockquote><p></p>
[QUOTE="geowork, post: 647651, member: 8036"] Similar to what you and Dihusky have said. It is important to have the ladder a sufficent distance off the wall to enable your feet to be securely placed on the rungs. As the ladder is already fabricated and in place, following is an option used on the Central Queensland Gemfields. Use 10 or 12mm threaded bar, pointed at one end, at least 300mm long. Don't make them too long or too thick, as it does take some effort driving them in, while standing on the ladder. Two bars on each selected rung, placed towards the sides of the ladder. Drill holes through the selected rungs or better, weld tabs on the underside and drill holes through those. On each bar have a nut/washer tightened on each side of the rung/tab after the bar is driven into place. This keeps the ladder both a sufficient distance off the shaft wall and fixed firm. Obvioulsy, the inside nut/washer needs to be placed and loose on the bar before starting to drive the bar in. All of the above assumes the top of ladder fix is capable of supporting all vertical loads. After a bit of time, natural metal corrosion and soil/clay/bar reactions will form a plug that won't pull out of a solid wall. In my recent shafts I have succesfully used 300mm landscaping screws driven in with an impact driver (easy!). But this would depend on the shaft wall competency. Also, the ladder was prefabricated with "spacers" to keep the ladder off the shaft wall. For the shaft collar, it really depends on what the surface strata is and how weathered or loose. Water flow and seepage is the important issue here. Build it up on the surface so no water flows or pools close. A bit of concrete or mortar slurry around the outside collar base is a good thing, before infilling. maybe also consider the landscaping screws. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
How to fasten the ladder to the side of a shaft?
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