Es gibt kaum bessere Systeme für die Kiesgewinnung als Schlepp bzw Schürfkübel Seilbagger. Die sind effektiv, flexibel und relativ gut mobil. Hab selber nen Weserhütte und nen DEMAG gefahren. Die einen nennen es Arbeitsgerät, ich nenne es Männerspielwiese. Ich liebe diesen Job. Tolles Video was du hier hochgeladen hast
Very nice machine, they mine gravel here with draglines but the draglines don't swing instead the cable stretches across a pond where it is held in place by an old excavator and the gravel is dragged on to shore where a wheel loader takes it and dumps it into a pile. They'll dig down to 80 feet sometimes doing it this way.
I can't get enough of watching these machines - I'm fascinated with them. But what I noticed is most will dredge dirt aka gravel from a river, lake, huge pond, & in this case - a hole filled with water. Is there any particular reason they do that? Why not use crushed rocks...also for a small job, why use a dragline and not a big excavator? Just curious. Lol. Thanks!
+cnote4461 Hello, thank you from your comment. What do you think where lakes and ponds for gravel extraction come from? :-) This was a new pit and the excavator ist extracting the gravel for the first time in this place. The water you see is the groundwater. Today, a year later, this is a really huge lake, around 250 x 150meters and up to 8 Meters deep and there is not much gravel left in it. Here in Bavaria, gravel ist one of the top construction materials... In other parts of germany, crushed rocks would be a opinion... but in bavaria, the gravel is "cheap"... we got a lot of it and you just have to extract it. Here you can see the lake in google earth: www.google.de/maps/place/Pucher+Meer/@48.1911104,11.2305635,157m/data=!3m1!1e3!4m5!3m4!1s0x479e806b6af5808d:0xe0e5479a33916982!8m2!3d48.1902857!4d11.2335794 best regards, david
Aggregate in a river bed is washed downstream from higher elevations as part of a natural geological process. It can be reclaimed in ideal sizes through screening washing rather than by blasting and crushing which is a more intensive process. Blasting and crushing, a different operation, does become economically and functionally necessary depending on the geographical location. Study digging charts of an excavator vs. dragline. A dragline can work from safe positions relative to the cut where loser material has greater angles of repose and stability immediately next to the cut becomes an operational problem when equipment lacks sufficient digging range. Digging underwater (digging blind) is tedious and is not as efficient as dry digging, but necessary when pumping water out of the excavation is not cost effective or even possible. Water laws may necessitate methods of excavating within the boundaries of an impermeable clay "curtain" that has been placed around the periphery of an excavation. In such operations, the excavation remains pumped out and more conventional types of mobile equipment are used to extract material from the site. Regulations may call for this "curtain" type operation and concern downstream interests such as agriculture and natural areas and address such issues as evaporation loss from standing water surface area at the excavation site and downstream water quality affected by the amount of solid particles brought into suspension by excavation activity.
