Recently, I have been completing numerous cut and fill projects in backyards for the construction of retaining walls or to create level ground on a slope. I have been encountering some challenges during this process and seeking advice on the best approach. I typically begin by approaching the slope uphill and gradually cutting in until I have a level pad to the designated wall line. Once the pad is large enough to maneuver the skid steer, I work my way across the slope, starting from the lower side and making cuts until reaching the wall line. However, I have noticed that the flat area tends to drain back towards the wall, indicating a possible issue with the initial cut being too aggressive. Would it be beneficial to create the pad first and then use a level to ensure accuracy before proceeding further? Additionally, during the final smoothing cut on the wall, I have noticed some flex and slight twisting in the arms and bucket of the machine. Is this normal or could it potentially cause damage? I am using a positrack RC30 for these tasks, specifically for jobs with limited access. I welcome any criticisms or advice on improving my technique. Thank you.
My excavation technique is similar to what many professionals use. I typically start by creating a one-bucket-wide swath that is 3-6" deep, depending on the type of soil. As I continue, I run with the arms down and utilize one side of the bucket to widen the swath by 12-18" at a time. If the soil is of good quality, the dirt tends to flow smoothly into the bucket, allowing for efficient work at a steady pace. To prevent excessive wear on the machine, I make sure to alternate sides when widening the swath and keep the cut edge trimmed using the side of the bucket with the arms fully lowered. Using a bucket as wide as the machine itself helps with the overall efficiency of the process. Working with the arms fully lowered and maintaining a consistent elevation with a laser transit or level ensures a smooth and precise outcome. By setting up the equipment out of the way and periodically checking the elevation, you can prevent over-digging and achieve a perfectly level surface effortlessly.
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At our company, we specialize in constructing retaining walls on a regular basis. While we prefer using a skid whenever possible, approximately 60% of our walls are created using a mini-excavator. This allows us to be extremely precise with the width of the footing and minimize excess spoil movement. For larger walls, we typically do the initial excavation with the mini-excavator and then finish up with the skid. The method we choose also depends on how much of the overburden will be utilized for backfilling the wall. Sometimes, we opt to stockpile 20-30 cubes of excess material if space permits during the construction process. In other cases, we may need to simply raise the level in front of the wall temporarily to accommodate the work. The best practice for handling overburden is to stockpile it behind the wall, if space allows, making it easier to backfill later on. This is where the mini-excavator shines compared to the skid, as it has the reach to toss the dirt up behind the wall efficiently. While we are fortunate to have both machines available, many contractors in our industry make do with just one and manage through practice and resourcefulness. It is crucial for all retaining wall footings to have a slight back slope, as it is preferable to be slightly lower on the uphill side than risk complications. It is important to leave extra space and take more from the back than what initially seems necessary. When aiming for a precise footing, we typically begin by overexcavating with the mini-excavator, followed by rough leveling with the skid and compacting with a plate compactor. We then add clean yellow sand to bring it up to the desired level, compact it, and finish off with a box. This method works well for clay or gravel footings, ensuring a solid foundation for the retaining wall.
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Answer: Answer: It is suggested to start by approaching the slope uphill and gradually cutting in until a level pad is created to the designated wall line. Then, work across the slope, starting from the lower side and making cuts until reaching the wall line.
Answer: Answer: To ensure proper drainage, it may be beneficial to create the pad first and then use a level to ensure accuracy before proceeding further with the cutting process.
Answer: Answer: Some flex and twisting in the arms and bucket of the machine can be normal during the final smoothing cut. However, if it seems excessive or may potentially cause damage, it is advisable to seek professional advice or consider adjusting the cutting technique.
Answer: Answer: Using a positrack RC30 can be suitable for jobs with limited access, such as cutting and filling projects for retaining walls in backyards. However, it is essential to ensure the equipment is properly maintained and operated to avoid any potential issues.
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