Project
The Forest Tower – Camp Adventure
The island of Zealand climbs to new heights – literally and figuratively!
At the top of the Forest Tower at Gisselfeld, you stand 135 metres above sea level, while the pleasure of taking in the impressive view lifts you even higher.
LE34 set out the tower so that the extremely heavy structure could be erected correctly and achieve its elegant form.
Unique attraction
Camp Adventure’s Forest Tower is a unique attraction. And we’re not just saying that because, as a surveying consultancy, we’re proud to have carried out the setting out for the impressive structure.
Recognition and acclaim have also come from world-renowned media such as Germany’s Der Spiegel, France’s Le Figaro and Spain’s El Mundo. The tower’s architecture has also received awards – including the 2017 ICONIC Award in the “Visionary Architecture” category.
TIME Magazine has also named the tower one of the world’s 100 greatest places to visit. This is due to both the captivating view and the entire walking experience on the way to the top: first through the forest, then up the spiral ramp between the large steel “crosses”.
Explore the Forest Tower
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Surveying
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Setting out
Need setting out for your project? LE34 is always ready to carry out setting out for everything from conservatories to major infrastructure projects. Whether you need a rapid response or a planned procedure, we provide the x and y coordinates and levels required to meet the relevant tolerance classes.
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Levelling
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Control point network
Need control points established? LE34 has some of Denmark’s most skilled chartered land surveyors and survey technicians, ready to establish control points and calculate coordinates for terrain, roads and buildings, giving your project an accurate point of reference.
Result of close multidisciplinary collaboration
The tower is the result of collaboration between many different professional disciplines and companies. As surveying consultants, we ensured that the elements were surveyed and set out correctly, working closely with Stål & Design, which manufactured the steel elements used to build the tower.
The architecture is unique, as is the structure. We therefore adapted our surveying methods to meet the challenges: the forest blocked our instruments’ lines of sight, and the structure is shaped like an hourglass.
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Many visits to the forest
The 54 six-tonne steel elements were hoisted into place one at a time, and the work took several months. LE34 therefore visited the site regularly to check that the elements were positioned correctly and within the agreed tolerances.
Towering facts
The tower itself is 45 metres high, but it stands at a high point in the landscape, placing the top 135 metres above sea level – the highest point on Zealand.
The tower is built from weathering steel and oak and consists of 54 steel elements, each weighing six tonnes. It has a hyperboloid structure: the long vertical steel tubes are not bent but rotated by 120°, creating the curved outline of an hourglass.
And those are not the only impressive facts about the tower:
Jesper Nørregaard Hansen, survey technician at LE34
It was quite a unique experience to help raise the tower in the forest. Obviously, such impressive structures are not built in Denmark every day. As a survey technician, it was great to be able to use my expertise to meet the challenges of building such a tall structure in a space that is so limited due to the forest’s trees.
Getting the tower to stand straight
The tower has three levels, each consisting of 18 elements. Each element weighs six tonnes and had to be lifted into position with a crane. Once the heavy elements were stacked, there was no opportunity to redo the work, so highly accurate setting out was crucial.
To ensure this accuracy, we marked points at the top of each level for the installation of support brackets, which the steel elements could lean against before being welded together. The brackets enabled the contractor to hoist the heavy elements into position using a crane.
We carried out checks throughout the process to confirm that the work was progressing correctly.
Jesper Nørregaard Hansen, survey technician at LE34
Our collaboration with both Stål & Design and Levi Jensen was excellent. Before setting out began, we carefully aligned expectations regarding the techniques and surveying methods to be used. This ensured that every element was set out to the accuracy required to create the intended stable structure.
Down to the last millimetre
Once all 18 elements on a level had been hoisted into place, we made meticulous adjustments together with Stål & Design before beginning work on the next level.
We measured the top of each element while the contractor used large threaded rods and other equipment to move the elements a few millimetres at a time – inwards, outwards or sideways. The result is that the elements stand within the agreed tolerances calculated by the engineers.
Building sites
All photos of the tower on this page are courtesy of Camp Adventure and EFFEKT Arkitekter.
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Contact us
Would you like to know how our specialist expertise in engineering surveying can help bring your project safely to completion? Contact us by email or phone.
Anders Nygaard Møller
Chartered Land Surveyor and Partner
Head of Engineering Surveying
+45 5131 4212
am@le34.dk
