Build a road in the narrow site

[jyf]

Dear all,

We have a site is 15m wide (one side is rail way and the other side is concrete wall). I need design a 4m wide road get through that (length will be about 750m). Anybody knows construction contractor can do that or not? Thanks in advance.

jyf

 

[Zambo]

jyf, why not? any reason why you cannot design the road to be immediately next to the wall? What about the railway regulations, perhaps the railway line has to be temporarily (or even permanently)fenced.

 

[msquared48]

Are there geotech problems?

Mike McCann
McCann Engineering

 

[Zambo]

msquared48 (is that correct this time?)

I guess you're right geotech must be the overiding issue, drainage might also be a problem if the road is constructed by filling the existing ground.

I first thought the OP was wondering if there would be a construction issue due to the width of the site, my thought is that the contractor can commence at one end a then just move forward. He could be limited to say 8m of the available 15m.

 

[DarthSoilsGuy]

drainage will be your issue, but only if you already have drainage issues. you may have to pave it all at once with asphalt trucks having to back-up for long distances, but i can't imagine any other problems.

50 foot Right-of-Ways (15 meters) are pretty standard around here to fit 24 foot wide roads with roadside ditches (7.3 meters wide). it hasn't been a problem for us or the contractor to keep the roadwork within the limits of the ROW and usually the abutting properties are theoretical concrete walls. (people don't like having trees cut down and new roads installed between their house and the neighbor's house)

 

[jyf]

Thanks for all!

The issue is that concrete wall is for holding the tank farm and it’s about 2m height. The client wants to build a road right against the wall with the same height.

My thinking is to build the road, the construction contractor should use a dozer start with the rail side to push the dirt to the concrete wall side. if I go 2:1 slop, the road embankment will be 4 meters wide and the road is be 4 meters. The dozer itself is 5 to 6 meters long, It same like 15m is not long enough for dozer operating. Right?

Thanks again.

 

[Zambo]

Sounds just a little bit crazy, but maybe that's because I haven't seen the drawings. Is this a high speed railway or just some tracks serving your client?

Why does he even need to touch the "dirt" at the "rail side"? Why not leave the track and its bed alone and bring new material for the road?

Maybe the plan works with the elevation and the embankment slope you plan, but in that case I think you will need a drain at the base of the embankment.

As for the working method I suggest you work in an 8m wide area using a dozer to push the heaps out and a backhoe to form the profile you need.

 

[msucog]

i suggest using caution building/filling next to other structures in the event the new fill causes settlement of those structures. it doesn't sound like you have a lot of fill going in, but there again, the geology or site conditions and existing structures' settlement tolerances may say otherwise.

as far as constructing it, i don't any reason why it would be too difficult to construct. it will just take some good 'ole fashioned coordination by the contractor to keep from running over himself. if you happen to hit something needing undercutting/replacement, it'll get tougher to manuever...had this happen on project of mine through a swampy area. twas about 1000' long, ~24' wide. available soil and muck disposal was on one side of the undercut and street access/crushed stone was on the other all bounded by property line on one side of the road and swamp on the other. trackhoe couldn't sit in excavation since he would've sunk so the excavation had to be undercut/replaced in about 15' lengths (approximate reach of trackhoe) at a time. the contractor was finally able to work on one lane at a time so that access either direction was open. some places did require being excavated multiple times just because they couldn't completely fix it from where they were at the first time...in other words, there was some overlap in the middle of the road for the undercutting. your situation doesn't sound quite this involved so i don't see any reason (looking through the computer) why it can't be done.

 

[jyf]

Thanks Zambo,

It's a minor rail.

And of cause we can bring the material in, as you said I do need a drain at the base of the embankment, that cause the base of the embankment goes to deeper and deeper, at the end of road, the base will be 4m deeper than the road, can backhole reaches that 4m? Thanks.

 

[jyf]

thanks, msucog. I will ask some Geo guy about that.

Yep. I think you got a worse case than me. see if I can post a drawing to make myself clear.