Filling a trench with concrete

[trevorbayliss]

I might be able to get a pump, but cost may be high. access is not too bad, but my neighbours will say no to a mixer on the drive i am sure. Our drives touch and both are narrow, so the mixer would have to rest on theirs.

If it is 9" then that means i need even less cement and mixing at my leisure is going to be much easier, plus costs will be less.

This means i will be needing 6T of concrete, or 3 cubm. That = £300 delivered. If i had mix it will be £135 ballast plus cement. Not a massive saving, but the working day will be less stressful for me.

 

[trevorbayliss]

I think my depth is going to be nearer 800mm based on past stuff in my road. We are on a sandy soil.

 

[stuart45]

I had to go down 2.2M for my extension, but I only put a metre of concrete in the bottom so I still had a fair way to come up in masonry, but I am used to working in trenches as trench fill is a relatively modern idea.

 

[trevorbayliss]

thats very deep !

 

[stuart45]

Shrinkable clay and Llylandi or whatever their name is close by in next doors garden.

 

[trevorbayliss]

Ok, sand and wall for me

any idea how many bags of cement for these footings if i use 6T ballast. I think the mix is 5:1. So maybe 45 bags ?

 

[stuart45]

6/1 is fine for a foundation, so you can use less than 45.

 

[trevorbayliss]

Ok thanks for info, plenty of working out still needed.

 

[stuart45]

Here's a photo of the dig done about 6 years ago.
http://www.contractortalk.com/attachments/f90/44798d1300703798-deep-footings-phpu7raujam.jpg

 

[trevorbayliss]

i think i saw some comment about this a while back by you. it sounded pretty hairy and looks it from the photo.

 

[stuart45]

I was glad to get up to DPC.
Luckily I knew a couple of retired farmers who dug it out and took away the spoil and spread in on their land for less than £200.