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Dry Stacking, Backfilling, and Compaction

5:26
17:09
365.6K views

At 5:26 in

Turning a STEEP Hill into a Flat yard #1

What happens here

The retaining wall is dry stacked for approximately four courses before backfilling commences. This allows for efficient block placement. Once the blocks are stacked, the previously laid geogrid is flipped up and structural fill soil is placed behind the wall. This soil, which is a granular material with a clay binder, is packed tightly using both a small 150-pound plate compactor in the drainage zone (closest to the wall) and a larger 'big packer' for the reinforcement zone (further back). This process of stacking, backfilling, and compacting is repeated for each set of courses.

Goal: Efficiently dry stack blocks, backfill with structural soil, and compact for stability.

Tools and materials

  • 'Big Packer' — Compacting structural fill soil in the reinforcement zone
  • 150-pound Plate Compactor Wacker Neuson — Compacting drainage aggregate near the retaining wall face
  • Mini Excavator Bobcat 325 — Assisting with soil movement and grading
  • Rake — Spreading and leveling soil
  • Shovel — Spreading and leveling soil
  • Skid Steer ASV RT-75 Posi-Track — Moving and spreading structural fill soil, especially on slopes
  • Structural Fill Soil — Backfilling behind the retaining wall for structural support

What they say

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so if you look you'll see us dry stacking the wall and we can actually dry stack the wall about four courses before we're forced to backfill it and what we do is we can flip we put the grid down and then we stack stack stack and then we flip the grid up we pack pack pack put the grid down at the appropriate level then continue to pack until we get to our four courses before we wash rinse and repeat that same process over again that's a little trick we use to speed up the process so here's kind of a fun fact you'll see that we're installing drain tile into the retaining wall but if you ever drive by a retaining wall and you see the drain tile actually operating it means that that wall is in a state of failure they see on modular retaining walls like this they are a mortar-less system intentionally and we use a lot of drainage aggregate and you're going to see that in just a moment but the entire retaining wall is designed to allow water to flow freely right through the face of it so if you ever actually see the water being funneled or jetted out through the drain tile at the bottom it means whatever company installed that retaining wall didn't put enough drainage aggregate in or that drainage aggregate that may be in place is boogered up and not operating so either way if you've seen drayton operating in a modular retaining wall something is wrong that's a big red flag so on this project we ended up bringing in about 45 dump truck loads of structural fill soil and instead of showing you each and every load going in we just thought we'd show you what it looked like so you could get a gist of what we're using and that is a granular material with the clay binder in it which allows us to pack it up tight like concrete yeah so now now he's got to get in there and mix it all together so that we can get it to pack [Music] so more than one of you guys have asked me stan what do you think of the asv versus the cat versus the kubota and here's the breakdown we love the cab on the kubota hands down love that swing up door but the cat has buttery smooth controls but the asv when it comes to just sketchy slopes that's the machine that the guys go to so that right there is a really sketchy move there's zero tolerance when a skid loader is gonna fall over it'll tip over sideways but it'll also likely tip forward and as he's coming down the slope especially with weight in the bucket all of the weight of that machine is now transferring forward and when you're driving down…

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