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By in Industry on 22nd Mar 2005 15:00

Compaction relief for Portman's plane trees

By Carol Dutton


The renovation of London's Portman Square continues apace with the deep, compressed air aeration of lawn areas immediately adjacent to 15 ancient London Plane trees.

Suffolk based Terrain Aeration were called in to treat the 150ft high specimens under contract to Garden Link, the main contractors in charge of implementing the new improvements specified by York landscape architects The Landscape Agency.

"There is a terrible soil compaction problem over the whole site," says The Landscape Agency's landscape director, Steve Heward. "We were asked by The Portman Estate to improve the quality of the square in keeping with the location."

The privately owned square, a "Communal Garden" covering one hectare was created in 1754 and re-instated in 1953. Having been used to grow vegetables during the war, the space subsequently suffered bomb damage, and according to Garden Link's MD, Dan Flynn, the space has hardly been maintained for the last ten years.

"The lawns were holding water, and there was a lot of moss," he reports. "I don't think there had been any spiking done on the grass and I doubt if the shrub beds had been dug."

Terrain Aeration, working at two metre spacings, covered as much ground as possible, approx 3,000 sq metres during their one-day hire. Using the company's Airforce machine they injected compressed air up to 20 bar, one metre down to create underground fractures and fissures beneath the grass and around 15 Plane Tree canopy lines. Dried, milled seaweed was injected on the final air blast, which will swell on contact with moisture and keep the air channels open.

The entire scheme, scheduled to be completed by the end of May this year includes the re-planting of the shrub layer, extensive tree surgery to lift the canopies and allow more light into the garden, as well as the addition of colour and interest to the four gateways. "We're resurfacing the footpaths, re-edging the lawn areas, and installing lighting and irrigation systems as well as replacing children's play equipment and repairing and repainting the two pavilions," continues Steve Heward. "This project is making exceptionally speedy progress, as we only started work on the designs last November. The object is to create an appropriate flagship for The Portman Estate, and to provide an attractive open area for the resident key-holders."

Terrain Aeration is expected to return to the square this autumn to treat areas currently obscured by landscaping activities.

For further information on the deep, compressed air de-compaction treatment offered by Terrain Aeration, contact the company on Tel: 01449 673783, or visit their website at: www.terrainaeration.co.uk



Read more articles in Industry, by Carol Dutton or from March 2005.



There are 3 comments on this article

23 Mar 2005 by Peter Leroy

I have used a similar system to decompact a 50 year old sport field, a few years ago now.

The one problem at that time was making sure that the operator had full control over the "soil heave" due to variable air pressure and sub soil compaction.

At the time it was a reasonably cheap and quick fix which gave sufficient time to go through the design anf finance stage of a full reconstruction.

25 Mar 2005 by David Green Terrain Aeration

Sir,
I( note Mr Leroy's comment s about variable control of ground heave and can confirm that this was indeed the case with the early German made Terralift Machines. The original pressure control system was crude in the extreme with manual control via a ball valve, this is a strange anomaly given the excellent design of other parts of the injection system.

The new generation of machines produced by Terrain Aeration for their own use feature a sophisticated pressure control system that has allowed the machines to become so controllable that Golf and Bowling greens can be treated without disturbing their run and or borrow.

There are instances such as this one at Portman Square where both the maximum 20 bar pressure and the maximum 57 litre blast volume were needed in some areas with much less power required elsewhere. Here it was the experience of the operator that allowed the machine to be adjusted to suit these two extremes.

Any queries welcome
David Green

25 Mar 2005 by Peter Leroy

Thank you for the update on how the new aeration machines have progressed. With soil heave overcome it is certainly an excellent method for decompaction of rootballs (trees) and in some instances of older sporting fields.

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