Demolition and Trench Excavation

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12:39

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Rebuilding a Collapsed retaining wall 4K

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What happens here

Utilizing a Bobcat E32 mini-excavator, the crew systematically removes the collapsed concrete blocks and debris of the old retaining wall. Concurrently, they excavate a new trench where the base of the retaining wall will be established. Precision is critical during this step; the trench must be dug to a depth of exactly one foot (12 inches) below the final grade. The adjacent sidewalk is used as a reliable reference point for maintaining the correct grade elevation throughout the excavation. It is explicitly warned not to over-excavate, as digging too deep would necessitate backfilling and extra compaction, potentially leading to future settling issues.

Goal: The crew demolishes the remnants of the old retaining wall and excavates a new trench, ensuring it is precisely one foot below the desired final grade for the new wall, using the adjacent sidewalk as a reference.

Tools and materials

Bobcat E32 Mini-Excavator
Caution Tape
Measuring Tape/Ruler
Shovels

What they say

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be done with it yep exactly [Music] so the first thing we got to do when we're prepping a retaining wall to rebuild it is to dig out the old wall but there's some do's and don'ts to that the first don't is don't over excavate don't dig too deep make sure you know exactly how deep you need to go and for a retaining wall like the one you see in the video we need six inches of Rock plus one block which is six inches buried that means we've got to go one foot below grade and we use the sidewalk as our great elevation so everywhere you see the sidewalk we dig that trench carefully one foot below making sure that we don't don't go too deep if we do go too deep we've got to back fill it and we've got a compact extra hard otherwise not right away but a year or two down the road you're retaining well instead of being a flattened level a

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