Terram/geoweb systems

[Gary Prentice]

Has anyone any experience in the methodology of these systems?

 

I have an existing tarmac drive which has been lifted by tree roots. The LA are looking for an alternate engineering solution, other than felling.

 

I can't imagine how to instal this, would the tarmac have to be removed, then a layer of sand spread over the roots, a geotextile membrane then the cellweb/geocell and the finishing surfacing?

 

At a rough estimate, this would raise the existing level by several inches:confused1:

[Wolfie]

Has anyone any experience in the methodology of these systems?

 

I have an existing tarmac drive which has been lifted by tree roots. The LA are looking for an alternate engineering solution, other than felling.

 

I can't imagine how to instal this, would the tarmac have to be removed, then a layer of sand spread over the roots, a geotextile membrane then the cellweb/geocell and the finishing surfacing?

 

At a rough estimate, this would raise the existing level by several inches:confused1:

 

Haven't put any down myself but i believe you can get different thinknesses of the cellweb depending on the weight of vehicle that will be using it. I would imagine that you'd have a good few inches of sub-base under the tarmac so the new level shouldn't be much more than existing.

 

 

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[Gary Prentice]

The minimum depth of any system, I can find, is 100mm.

 

The real issue is that the roots are already growing in/on top of, the sub-base and lifting the tarmac. They can't be removed or damaged by placing the cells in direct contact with them.

 

I'm thinking that the top finishing level of tarmac would have to be removed - by hand- a growing medium used to cover the roots, them the cellweb above that.

 

The cellular systems and Amsterdam/load bearing soils simply aren't designed for these circumstances.

[dumper]

We placed system down for root protection in a car park, light use cells were 200mm deep with 100 mm sand beneath

[Gary Prentice]

We placed system down for root protection in a car park, light use cells were 200mm deep with 100 mm sand beneath

 

The Terram Geocell 25/15 is shallower, but only for light vehicles. I'd assume that unless height restriction barriers were in place, the designers would have to over engineer/specify.

 

Was the sand laid straight onto top soil?

[dumper]

Sand was a non compacting sand single size grains straight onto soil laid by hand following decompaction

[gibbon]

I shouldn't worry about the roots after you've lifted the Tarmac. The chances are nearly all of them will be stuck to the under side of the Tarmac and broken when its lifted. Try to lift from closest to the tree first working out, but its almost impossible to left off the roots, not like block paving

[woodland]

The Terram Geocell 25/15 is shallower, but only for light vehicles. I'd assume that unless height restriction barriers were in place, the designers would have to over engineer/specify.

 

Was the sand laid straight onto top soil?

Try and use the Cell web product its far stronger unlike the terram version. Depending on the situation we have in past contracts carefully stripped the existing tarmac using a digger and grading bucket and then as you say import some decent topsoil to cover existing roots and to level up the area. then a layer of sharp sand, a woven geo textile, then web a minimum of 200mm for cars, filled with clean angular stone, then another layer of geotextile and then your wearing course. if you contact geo synthetics i they will give you the full spec have fun

[Gary Prentice]

I shouldn't worry about the roots after you've lifted the Tarmac. The chances are nearly all of them will be stuck to the under side of the Tarmac and broken when its lifted. Try to lift from closest to the tree first working out, but its almost impossible to left off the roots, not like block paving

 

Try and use the Cell web product its far stronger unlike the terram version. Depending on the situation we have in past contracts carefully stripped the existing tarmac using a digger and grading bucket and then as you say import some decent topsoil to cover existing roots and to level up the area. then a layer of sharp sand, a woven geo textile, then web a minimum of 200mm for cars, filled with clean angular stone, then another layer of geotextile and then your wearing course. if you contact geo synthetics i they will give you the full spec have fun

 

This is hopefully not going to prove to be necessary, I've a refusal on the grounds that an alternate engineering solution was not considered. Even with no practical knowledge, I had realised that this wasn't a practical solution. Oh to live in L.A L.A land....

 

Thanks for the replies, there's a fuller explanation of the circumstances in the 'Law section - Abating Nuisance.

[Gary Prentice]

Has anyone any drawings available, particularly of the edge restraints?