Good evening everyone,
just a brief explanation to clarify the starting situation.
We have a parking space with a slope of about 30cm (12 inches) over a length of 6.5m (21 feet). (So, a fairly gentle slope.) A caravan will be parked on this space, and we want to pull it onto the spot using a winch. The winch will be hooked onto an eye bolt at the end of the parking space. The caravan weighs about 1.5 tons, so the hook needs to be securely fixed.
My idea was as follows:
To pour a ground anchor like this #link removed; Bauexperte into a concrete foundation. For the foundation, I was thinking of a size around 50 x 50 x 80 cm depth (20 x 20 x 31 inches), and I planned to include a handful of rebar to increase stability. The foundation should protrude about 10-15 cm (4-6 inches) above the soil so the cable does not lie directly on the ground later; therefore, I would install formwork at the upper part.
Am I heading in the right direction here? Do I need to use a special type of concrete? I was thinking about #link removed; Epi concrete. Are there any more affordable alternatives to the expensive ground anchor?
Are there important tips or anything else I should know?
I would really appreciate help, as I have been dealing with this topic for a while but am worried about doing something wrong.
just a brief explanation to clarify the starting situation.
We have a parking space with a slope of about 30cm (12 inches) over a length of 6.5m (21 feet). (So, a fairly gentle slope.) A caravan will be parked on this space, and we want to pull it onto the spot using a winch. The winch will be hooked onto an eye bolt at the end of the parking space. The caravan weighs about 1.5 tons, so the hook needs to be securely fixed.
My idea was as follows:
To pour a ground anchor like this #link removed; Bauexperte into a concrete foundation. For the foundation, I was thinking of a size around 50 x 50 x 80 cm depth (20 x 20 x 31 inches), and I planned to include a handful of rebar to increase stability. The foundation should protrude about 10-15 cm (4-6 inches) above the soil so the cable does not lie directly on the ground later; therefore, I would install formwork at the upper part.
Am I heading in the right direction here? Do I need to use a special type of concrete? I was thinking about #link removed; Epi concrete. Are there any more affordable alternatives to the expensive ground anchor?
Are there important tips or anything else I should know?
I would really appreciate help, as I have been dealing with this topic for a while but am worried about doing something wrong.
D
Deliverer27 Jul 2016 11:38tomtom79 schrieb:
Only rolling resistance needs to be overcome.In this case, however, you also have the downhill force. Which roughly triples the total. Here, approximately 650 newtons.
Since the foundation is not calculated anyway, you can roughly estimate using 65 kilograms (143 pounds) of downhill force plus rolling resistance, static friction, and a bit of additional factors. (I’m leaving out air resistance ;-)
So, if the component can handle 100 kilograms (220 pounds), it should be fine. Given the foundation size and a proper heavy-duty anchor bolt (10–12 millimeters (0.4–0.5 inches)), my gut feeling says it’s definitely sufficient—whether in tension or with a 90° shear force.
I’m not a physicist—so I’m happy to accept corrections ;-)
I consider a 100kg (220 lbs) towing force due to the slope to be properly sized. Actually, it’s less, but it’s meant to be secure. Theoretically, you could manage without it, since the brake does the same job. However, it would be easier to maneuver the caravan correctly using the car from the start. You can also easily move it back out again by driving the car up to it. Using a winch to hold it in place over the winter is basically unnecessary. With a wheel chock for each tire plus the brake engaged, the unit won’t roll anywhere. A 30cm (12 inches) drop over 6 meters (20 feet) equals a 5% slope, which is quite significant if you want to sit inside. If you plan to use the caravan on-site occasionally, a more level setup might be preferable.
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