Big, bigger, biggest...
The big chain trencher, Interdrain 6050, installs
drainage pipes to keep subsoil water out of the excavation
Archaeologists at Museum Lolland-Falster use monster machinery.
Denmark's largest chain trencher is in use in Denmark's largest
archaeological excavation project.
In connection with the archaeological excavations ahead of the
development of the permanent link under the Fehmarn Belt,
archaeologists from Museum Lolland-Falster are facing huge
challenges. Not least because a large number of the excavations
take place in a fossil lagoon, i.e. a shallow area separated from
the actual sea by small isthmuses and islands. The area was
embanked behind the Sea Flood Dike following the great
Baltic Sea Flood in 1872.
Archaeologists facing extremely difficult excavation
The area's highly complicated excavation-technical conditions
with a high groundwater level and very loose sediments made it
necessary to lower the groundwater in order to keep the excavation
area free of water. The groundwater was lowered using perforated
pipes laid directly on the moraine around the entire excavation
area in a 30 cm wide trench. A week before excavations start, a
chain trencher on caterpillar tracks lays out drains in the ground
around the selected excavation area. In each corner of the area,
the installed drainage pipes are connected to large vacuum pumps,
which pump water away from the area. For this purpose, the huge 460
HP chain trencher Interdrain 6050 is used, which is capable of
installing drainage pipes to a depth of max. 6 metres. This chain
trencher is one of the two largest chain trenchers in Denmark.
Drawing: Femern A/S
The chain trencher - a giant
Interdrain 6050 is the largest type of tractor-mounted chain
trenchers in Denmark. There are only two of this type of giant
chain trenchers in all of Denmark.
The chain trencher is like a big chainsaw, which digs trenches in
the ground for the installation of drainage pipes and cables.
Afterwards, the trenches are covered again by a bulldozer.
Interdrain 6050 is particularly suitable for the installation of
PE pressure pipes measuring from 50 to 400 mm and at a digging
depth of 40-220 cm. It operates with a digging width from 30 to 60
cm. The machine can be displaced sideways for the installation of
pipes, e.g. for roadside ditches. Naturally, the digging depth can
be controlled by laser.
Completed work can be measured in by means of GPS.
The giant chain trencher belongs to the engineering company SM,
which carries out chain trenching throughout Denmark.