The roundabout near where I work (J9, M27) is being widened to accommodate a fourth lane, being intrested in this sort of thing has lead me to having a good look when driving or walking past. However, what they are doing doesn't make sense IAW what I was expecting.
They have dug down 6' where the new lane is going, shifted any pipes/cabling (gas, street lighting, traffic control) either further into the roundabout where possible or buried below this 6' dig and covered with 6" of what looks like lean mix.
Now this is the bit that really does make sense, they have now backfilled 4' (so far) of the 6' with layers of compacted crusher run. Why dig so far down? If you are going dig this far down and build up why use crusher run not Type 1? As it has natural restraint on both sides why dig half that depth and fill with concrete.
Am I being a bit naive or am I just total missing something, either way it is great to watch. Shame I can't see it from the window of my office!!!
Mike
Major civil engineering works - Amature trying to understand
-
Dave_L
- Site Admin
- Posts: 4732
- Joined: Fri Jul 28, 2006 8:47 pm
- Location: Somerset
- Contact:
6' down does indeed sound deep for road construction - but it depends what the sub-soil etc was like I guess.
RW Gale Ltd - Civils & Surfacing Contractors based in Somerset
See what we get up to Our Facebook page
See what we get up to Our Facebook page
-
dig dug dan
- Posts: 2504
- Joined: Thu Jul 10, 2003 10:20 pm
- Location: hemel hempstead,herts. 01442 212315
up here where they are widening the m1 (due to complete in 1 year), they have a concrete crushingplant going all the time. All the sub base is crushings, no type one in sight yet! lots of crushed glass also.
talking to my aggregate suppliers, there are supposedly new taxes coming in on type one due to its environmental impact to extract it, and process it. basically, they want you to recycle old, not dig out new. time will tell though. another government way of making money.
talking to my aggregate suppliers, there are supposedly new taxes coming in on type one due to its environmental impact to extract it, and process it. basically, they want you to recycle old, not dig out new. time will tell though. another government way of making money.
Dan the Crusher Man
01442 212315
www.crusherhire.co.uk
"a satisfied customer? we should have them stuffed!"
01442 212315
www.crusherhire.co.uk
"a satisfied customer? we should have them stuffed!"
-
Tony McC
- Site Admin
- Posts: 8346
- Joined: Mon Jul 05, 2004 7:27 pm
- Location: Warrington, People's Republic of South Lancashire
- Contact:
To answer Mikey's question, to go down 6 feet to formation level would only take place if the ground was particularly suspect. There may be running sand or cowbelly-clay that can't be built over.
As for the crushed glass, I mentioned its use as a bedding sand in the News feature written following my visit to Civils a month or so ago. The progressive taxation of primary aggs is "persuading" us to use recycled wherever possible, and that's no bad thing, as far as I can see.
As for the crushed glass, I mentioned its use as a bedding sand in the News feature written following my visit to Civils a month or so ago. The progressive taxation of primary aggs is "persuading" us to use recycled wherever possible, and that's no bad thing, as far as I can see.
Site Agent - Pavingexpert
-
Mikey_C
- Posts: 952
- Joined: Mon Oct 30, 2006 8:24 pm
- Location: Bournemouth, Dorset
Thanks gents, I must admit the spoil they are removing does look a bit clay'ie, so maybe thats the cause. I guess the contractor will be a bit upset if he is on fixed price. The tarmac laying machine and a much more substantially roller arrived today. The curbs got concreted in over the weekend covered in hessian to protect them fro frost, I shall continue to watch with interest!
-
lutonlagerlout
- Site Admin
- Posts: 15184
- Joined: Fri Aug 04, 2006 12:20 am
- Location: bedfordshire
