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Thread: Approach Angle

  1. #21
    Pedal Smasher Autoholic's Avatar
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    I can never leave engineering type problems alone. Ever. I know it's easier to design from a blank sheet of paper than dealing with real life variables, most times but not all, however I believe the below info is definitely doable. It could make a huge difference in overall ease of access to your driveway and it shouldn't require a lot of dirt to be removed. All units are degrees and inches. The overall length to pull this design off was 20 ft with only 1 ft of earth having to be removed within the first 15 ft. That's 1 day with a skid steer and a bucket. This isn't enough to require building retaining walls. I highly doubt it's enough to piss off the county and they probably wouldn't notice it at all. You could lengthen the base of this design to make it even more gradual, requiring less depth of earth to be removed. I only went after the first 20 ft. If you could double that, I'd bet only 6-8" in depth. The overall grade is still 15° at the end of the transition.
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  3. #22
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    Quote Originally Posted by Autoholic View Post
    I can never leave engineering type problems alone. Ever. I know it's easier to design from a blank sheet of paper than dealing with real life variables, most times but not all, however I believe the below info is definitely doable. It could make a huge difference in overall ease of access to your driveway and it shouldn't require a lot of dirt to be removed. All units are degrees and inches. The overall length to pull this design off was 20 ft with only 1 ft of earth having to be removed within the first 15 ft. That's 1 day with a skid steer and a bucket. This isn't enough to require building retaining walls. I highly doubt it's enough to piss off the county and they probably wouldn't notice it at all. You could lengthen the base of this design to make it even more gradual, requiring less depth of earth to be removed. I only went after the first 20 ft. If you could double that, I'd bet only 6-8" in depth. The overall grade is still 15° at the end of the transition.
    Joseph, that visual is very helpful. As long as the remaining slope remains below 15% all the way up it should work. I will show it to the pavers who will establish the finish grade, perhaps it will solve the problem. This is not an unusual issue so I hope the paving company has seen it before. Thanks very much!
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  4. #23
    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by kwschumm View Post
    Joseph, that visual is very helpful. As long as the remaining slope remains below 15% all the way up it should work. I will show it to the pavers who will establish the finish grade, perhaps it will solve the problem. This is not an unusual issue so I hope the paving company has seen it before. Thanks very much!
    Even if for some weird reason your paving company hasn't done a curved ramp before, it should be VERY easy to pull off. A word of caution however, the shorter the base of this transition, the harsher the transition will be when driving. I'd stretch it out if possible. The below design is for a 40 ft transition. I was wrong about less depth, it's the opposite. In this, the max depth is at 18 inches and optimum would probably be around 2 ft in depth. Still not at retaining wall kind of depth and the edges could be smoothed out to lessen that issue. But, with a 40 ft transition it would be a smoother ride and less chance of catching air going down too quickly. Something to think about and discuss with whoever is in charge of your driveway design. Like the previous design, we're still within the area I'd sum up as necessary improvements for paving and likely not to catch much attention. You're still not carving out a hillside to make this work.

    Once you're on the driveway, your slope goes to pretty much zero after the transition. The car will be level with the driveway going up. I know I wouldn't want a hard 15° entrance to a driveway, even in a truck.
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  6. #24
    1000 Post Club kwschumm's Avatar
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    Quote Originally Posted by Autoholic View Post
    I know I wouldn't want a hard 15° entrance to a driveway, even in a truck.
    It's not quite that bad, it's 15% not 15°, so really around 8.5° but I get your point.
    Thurston County, WA, effective motto: "Gophers, Gophers Über Alles"

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    Pedal Smasher Autoholic's Avatar
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    Oh. I thought I read 15° in your previous posts. If it's only confirmed at ~9° for say the first 20 ft, the paving company should only need to worry about a smooth transition for like the first 5 ft. You don't have a problem at 9°. They don't even need to really see the before mentioned designs. Just make sure they don't do a hard edge at 9° to the road and instead smooth it out, so it's not like hitting a speed bump.
    Last edited by Autoholic; 06-23-2019 at 07:46 PM.
    "Autoholism is an incurable addiction medicated daily with car porn." ~Zeppi

    1973 Opel GT project car - Plans: 2.5L CIH, Weber 38 DGAS, Getrag 240, Lowered 1", Watts link, exterior color - Rainforest Green Pearl, interior color - tan

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