Double Terraced Retaining wall crashes down pt2

alright guys we got a busy day ahead of us today if you're just tuning in we had a double terrorist retaining wall that came crashing down and it had a garage that's hovering right above it so we've got to carefully start to remove the old retaining wall and keep building up on the new one during the excavation it's important not to over dig any more than you have to [Music] any blots we come across it sorted away from the backfill soil in a perfect world we'd want to dig right down to the elevation that we want the bare dirt to that way it has it hasn't been disturbed but even when we do that we've still got a compact it it doesn't matter if we do it perfect or not it doesn't hurt to hit it once over with a small plate Packer to make sure that you have no unsettled soils in that trench they also start dismantling the upper wall you'll see us dumping these materials into the bucket of our cat skid loader we don't have to Holloway the excavation spoils but we don't want them anywhere near the trench while we're trying to establish our base all right let's talk drain tile actually if you see drain tile ever functioning in a dry stacked modular retaining wall it means that retaining wall is in a state of failure drain tile is not only not needed in a retaining wall system like this it shouldn't technically function the entire retaining wall is designed to weep that's why we use so much drainage aggregate and there's no mortar so the water can pass freely through the retaining wall if we concentrate that water in any one area we can create hydrostatic pressure and then we can create a potential blowout so we don't technically want the drain tile to work we want the entire wall to work we still stick the drain tile in because it's easier to say yeah there's drain tile in the retaining wall then try to explain why you don't need drain tile in a retaining wall so let's show you how we put in this drain tile that should never work so the drain tile has to have an outlet and that's every 40 feet on center now when he goes to cut in the outlet he doesn't take it out of the center section of the block he takes it out of the side of the block but he also does something a little bit different that we're going to show you here in just a moment [Music] once the block is cut to allow the opening he then cuts a slit into the block that will actually hold it in place and lock it into the retaining wall let me show you what that is right here the soil we want to reuse gets saved and set to the side in fact Blaine's gonna scoop away all of that loose material just to make sure nothing gets kicked into the bottom of our base before we have the wall phased out and towed in the new trench gets touched up by hand before it gets hit by machine alex scrapes a thin layer of rock into the bottom of the trench simply to get better traction with the packer [Music] Heka packs the sub-base material which is the Roger to make sure that if there was any like excavation over sizing it's all firmed up before the base actually goes in [Music] while the base is getting prepped for the new retaining wall the block is getting prepped to get thrown away with a full bucket he ops to back down the hill right off from the driveway if he went forward with it there'd be rock all over the yard [Music] with the sub-base material packed and ready to go he can now add enough material to bring it up to the bottom of his retaining wall but that still has to get past unlike class 5 or other materials that may be used as base this material does not need a lot of compaction to lock together in fact a light hit pretty much sets it in place the boys will add a touch of material where ever they feel they've got any low spots before the first block goes down he scans the base for imperfections looking for anything that doesn't look like it belongs now they've still got a corner to build up and that requires the cutting of blocks so while alex is focusing on basing out in front of the team they're gonna start building up that inside corner [Applause] [Music] now he uses the concrete saw because he has to have a very precise cut to make a very precise fit like a glove it's like you've done that a couple of times you guys are tuning in from part one you know that Alex is in training to be a foreman but he's also in training to be a baser and so this is the perfect kind of projects we like to put people that are in training on shorter retaining walls four foot in under [Music] fan places the shovel to mark the center of where you want Lane to dump the draining name with the bottom wall getting close to height they feel comfortable enough to take out the upper wall play it safe and not jeopardize that upper Dhiraj a lot of the removals are done by hand all right so we got drain tile down the class five in up to this point and originally this was a little two-tier wall so there was one here and then obviously one that we've been tearing out but what we're going to do next is start adjusting this great we're going to be shaving it down I'm gonna jump in here because Sam mentioned class five and in fact we actually don't use class five anywhere on our projects although you can we prefer 3/4 clear and this is the stone right here I want to clarify this it's 3/4 inches in size angular in nature and no matter what you do pretty much locks in place because of all these angles you hit it with a light compaction and it isn't going anywhere now on the next video we're gonna be wrapping this project up finishing the landscaping capping the wall and finishing this project out and that's all we got for you today god bless you guys go get them do me a favor hit that subscribe button hit the share button and hopefully we'll see you next time oh look at there's my wife up on the what let's find out what the heck is gone nothing well I'm sorry honey what are you what are you doing on the kids playground we have no kids that play on the playground by the way the grandkids and what are you doing up there they were supposed to fly over your work my wife is a registered nurse at the VA am I supposed to mention that is that okay to say and so the f-16s we're gonna fly over her work today and so she's just looking for him see on the next one