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Examination of root systems in Haga, Gothenburg. Photo: Ulf Angberg
This news is older than 6 months

Trial lifting trees attracted visitors

At the end of October we lifted and examined trees in Haga. It was a successful work and we are now analysing the results to be able to plan our continued work prior to construction of the West Link. See video clip from the work below.

It was on Tuesday morning the 27th of October that the first out of three trees was lifted out of the ground so we could study the roots. Archaeologists were also in place in Haga to see whether there were any ancient remains in the ground. The occasion of the first tree lift was a well-attended event where representatives from both the Transport Administration and the City of Gothenburg authorities were in place to answer questions.

Many by-passers were curious and stopped and watched as the tree-lifting machine did its work. The tree remained in the air for about an hour before it was put back down into the same hole again. During the following days we lifted another two trees and continued to examine the roots and the ground by digging holes around a number of trees.

Archaeological finds

During the examinations, there were also a number of archaeologists from the City of Gothenburg Museum on the spot to study the holes from an archaeological point of view. Kungsparken was originally part of the Gothenburg fortifications back in the beginning of the 1600s, and it is therefore important to check the ground for archaeological finds. During one of the excavations, we found remains and traces of human activity from several eras.

Today's park area previously consisted of a field dike, a low, sloping earth embankments in front of the moat, which today is preserved under the ground. The archaeologists had hoped to find the so-called "Banketten", a stone wall in the inner part the field dike, in order to be able to determine where the wall are located under the ground. Since this was not found, we will have to do more excavations in the area.

Making sure the trees are healthy

Both the investigations of roots as well as the three tree lifts went well; the trees had small roots and were easy to lift. In order for the trees to stand firm after the lift we have secured them with stays and braces that will stabilise the trees until they have become properly rooted again. This could take up to five years. In the meantime, we are keeping a careful watch over the trees in order to make sure that they remain healthy and that they are properly cared for in terms of both watering and trimming.

What happens now?

– Since the examinations were concluded, we have been working on analysing the results. These results will then serve as the basis for the continued work on the action plan for trees. Already in spring time 2016 it could be time to start with preparatory work for the larger trees that will be moved permanently to another location in the immediate area, says Karin Malmquist, Project Manager for the West Link Project station Haga.

The purpose of this fall's tree examinations was to gain information on the preconditions within the area, and to discover the condition of the root systems and the ground. This is in order to be able to save as many trees as possible during the West Link construction period by either permanent or temporary relocation.