Building question, driveway between 2 levels.

Ok this is a bit of a weird one. Imagine the main road is about 9ft above the level of a garden. Would it be possible to lay a sloped drive that ran down into the garden? What sort of materials would you need? Gardens about 50ft long btw and no limit on the slope length, but thinking 30ft --> 20ft flat (approx 10-15degree slope). This is mostly a materials stress question btw as i'm trying to work out how to hold the slope together at the high end.

Nice relaxing sunday morning question for you LOL.

15 Comments

you need to dig quite a way down, if i were you i would place a good foot or two of aerated concrete first then build it up in type one hardcore, compacted in layers with several passes of a vibrating roller, then depending on what you are wanting your wearing surface to be depends on what would come next, i would go for block paviours that way if you get anywhere that sinks you can lift a small section and top it up then relay the blocks.

http://faculty.fortlewis.edu/may_d/dmay_homepage_support/pics/steep%20driveway.jpg
:-D

You would probably need a reinforcing wall either side and then regular balast would probably do,

Original Poster

tonyg1962;5667217

You would probably need a reinforcing wall either side and then regular … You would probably need a reinforcing wall either side and then regular balast would probably do,



That's mainly what i'm wondering about, shoring up the side towards the house (the other side 'looks' solid), wouldn't want to drive into the slope and have the lot collapse. It's a house i'm thinking of buying, not even looked at it yet :lol: At the moment it's got what looks like a 12x12 raised 'plinth' for parking but if I bought it i'd want to run that down the side of the garden. Not even sure i'm making sense here :lol:

You definitly need a reinforced concrete retaining wall for that height and a structural engineer to design it.

A way round it would be to dig away and slope the ground at the side of the drive to give a slope of 45 degrees. You could then have a maximum of a 4 foot wall and 5 feet of sloped garden but it would be a hell of a lot cheaper.

Also you will need some form of filter medis behind the wall with weep pipes through the wall.

Original Poster

barneydog;5667356

You definitly need a reinforced concrete retaining wall for that height … You definitly need a reinforced concrete retaining wall for that height and a structural engineer to design it.



That's what i'm trying to work, the best structural material to contain all the junk :lol:

Heres a pic to show my rough idea. The red bit is the proposed slope, the odd shaped bit at the end of the red is the current car port. The green bit would probably just be slabs as that part is level.

http://www.shengis.net/hukdpics/drive.jpg

Without actually going and having a look at the place though i'm only guessing at the original road height above the garden. Might take a drive out there and see later.

You could possibly do it with gabions, its hard to know without seing the site (and the fact that I've not done any structural work for about 10 years:oops:)

Two gabions high would do it with a little slope left. The down side is the extra excavation needed to fit them in, the up side is you could do most of the work yourself and the cost would be a lot less. :thumbsup:


[url]www.hy-tengabions.co.uk/technical_publications/design_guide.pdf[/url]

barneydog;5667701

You could possibly do it with ]gabions, its hard to know without seing … You could possibly do it with ]gabions, its hard to know without seing the site (and the fact that I've not done any structural work for about 10 years:oops:)Two gabions high would do it with a little slope left. The down side is the extra excavation needed to fit them in, the up side is you could do most of the work yourself and the cost would be a lot less. :thumbsup:



you might want to edit your link as it takes it back to this thread :thumbsup:

richp;5667729

you might want to edit your link as it takes it back to this thread … you might want to edit your link as it takes it back to this thread :thumbsup:



Thanks :oops: :thumbsup:

Shengis;5667653

That's what i'm trying to work, the best structural material to contain … That's what i'm trying to work, the best structural material to contain all the junk :lol:Heres a pic to show my rough idea. The red bit is the proposed slope, the odd shaped bit at the end of the red is the current car port. The green bit would probably just be slabs as that part is level.Without actually going and having a look at the place though i'm only guessing at the original road height above the garden. Might take a drive out there and see later.



Silly Q here... but it looks like thats an access road on the right:

Could you not just take out a portion of the fence at the back, pop in double gates and drive it round that way without losing a significant portion of your garden and having all that additional expence?

Edit: Unless its for pedestrian access only in which case ignore me:oops:

Original Poster

angelkelly;5667732

Silly Q here... but it looks like thats an access road on the right:Could … Silly Q here... but it looks like thats an access road on the right:Could you not just take out a portion of the fence at the back, pop in double gates and drive it round that way without losing a significant portion of your garden and having all that additional expence?Edit: Unless its for pedestrian access only in which case ignore me:oops:



I 'think' its a footpath unfortunately. It runs right along the front/back as well. That would be toooo easy :lol:

Does the slope have to be at a constant gradient?, if not couldn't you just take the drive down into the garden at a steeper angle where the hard standing is now and the just follow the existing contours?

Original Poster

barneydog;5667849

Does the slope have to be at a constant gradient?, if not couldn't you … Does the slope have to be at a constant gradient?, if not couldn't you just take the drive down into the garden at a steeper angle where the hard standing is now and the just follow the existing contours?



Thats sort of what i'm thinking. Cut away the existing bit inside the red line leaving the edge as a support wall then carry on down. Could probably lose 2-3ft easily on that stretch over the distance and still keep the slope under 20degrees. Will look into your gabion idea as it looks like it would work and be a lot cheaper than other options

Original Poster

Well.... Wife rang the estate agents and the place is sold anyway. I guess they didn't add STC to the description as they wanted to get people through the door so they could try to sell them something else. At least i learnt something here and I get to avoid the hassle of getting planning permission :lol: Think we'll just look out for a house with pre-made driveway.
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