Hohenwarthe lock
| Location sketch |
Location of the lock at the Magdeburg waterway intersection
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| photos |
The Hohenwarthe lock closes the eastern section of the Mittelland Canal to the east and lowers the level to the level of the Elbe-Havel Canal, which is only 200 m further east . It was opened in October 2003 together with the Magdeburg Canal Bridge .
construction
On October 12, 1999 the foundation stone for the Hohenwarthe ship lock system was laid. A working group (ARGE) consisting of the companies Heitkamp Ingenieur- und Kraftwerksbau , Bauer Spezialtiefbau GmbH and MG Engineering Stahlbau Plauen GmbH started work on the construction site at the beginning of 1999. The underground section of the now completely overbuilt Hohenwarthe double ship lift , the construction of which was discontinued around 1941 as a result of the Second World War , previously stood at this point .
Preparatory work
Before construction could begin, the areas overgrown over the past 60 years were cleared. Furthermore, weapons had to be searched for over 40 hectares and old concrete structures had to be demolished and disposed of. The actual construction work required deep compaction of the subsoil in parts of the construction site so that the stability of the subsoil is guaranteed.
Foundation / geotechnical features
In order to be able to create the excavation in the dry, it was necessary to create a cut-off wall up to 50 m deep around the future excavation. This cut-off wall binds into the upper groundwater reservoir (horizontal water-blocking layer) and thus seals the excavation against the groundwater. The necessary cut-off wall area was around 44,000 m². The cut-off wall was produced partly with a cut-off wall milling machine and partly with a slot gripper.
After the cut-off wall had been built, the groundwater in it could be removed and the construction pit dug. At the same time, with increasing excavation, the construction pit walls were secured with a pile wall . After the excavation was completed, the pile foundation for the lock system began. The pile foundation consists of around 1248 large bored piles with a diameter of 88 cm and up to 21 m long. The pile foundation transfers the structural loads to the load-bearing layer at different heights in the area, a marl boulder .
Constructive features
The dimensions of the effective lengths of the two chambers and the principle of economic sluice agree with the lock system Rothensee match. Although the locks look the same, there are considerable structural differences.
The lock system stands on a joint, jointless base plate that is approx. 245 m long and 55 m wide. The height of the base plate is 5.5 m. The bottom course system is integrated into the bottom, through which the water is led from the longitudinal channels and the savings basin through filling slots in the bottom into the lock chambers. Likewise, the amount of water (approx. 60%) is released from the lock chamber to the savings basin via the base channel system.
The lock chambers are divided into 14 chamber blocks, which are provided with expansion joints in order to absorb the structural movements that occur.
Between the two lock chambers there is a 12.5 m wide central pier, in the foot of which the longitudinal canals belonging to the lock chambers are integrated. The height of the lock chamber walls is 24.45 m. The machine halls belonging to the lock system, which house the locks for the three rows of saving basins on each side, as well as the pumping station in the underwater, are also on a pile foundation.
Mechanical equipment
There are three pumps with a capacity of 3.5 m³ / s each in the pumping station of the lock system. The control of the lock processes as well as the recording of the vehicle data takes place in the central control station, which is located on the lower head between the two lock chambers. From here, the staff can see the two lock chambers as well as the upper and lower outer harbor.
Torsionally rigid pull segment gates with flange-mounted drive pulley, which are driven on one side by hydraulic cylinders, are used as lock gates. The weight of an upper gate is approx. 35 tons. The lower gates are designed as a folded structure as overstowed lifting gates. It is driven by two hydraulic cylinders each , which are set up on the subgrade . The weight of a lower gate is about 130 tons.
Traffic transfer
The topping-out ceremony at the Hohenwarthe lock took place on May 14, 2002. The Hohenwarthe lock was ceremoniously opened to traffic on October 10, 2003 in the course of the opening of the Magdeburg waterway intersection.
Ascent
Since the ascent on the Mittelland Canal does not follow the actual course of elevation, but is defined in the inland waterway system as a journey in the direction of the Elbe-Havel Canal , the situation at the Hohenwarthe lock is that a climber is actually sluiced down.
Technical data / dimensions
| Dimensions | |
|---|---|
| Lock chamber usable length | 190 m |
| Lock chamber width | 2 × 12.50 m |
| Lifting height | 18.55 m to 19.05 m |
| Height of Obertor | 5.30 m |
| Height of the lower gate | 10.50 m |
| Dimensions | |
| Reinforced concrete | 320,000 m³ |
| Reinforcing steel | 35,000 t |
| Earthmoving | 2,000,000 m³ |
| Sheet pile steel | 4,500 t |
| Hydraulic steel structures | 2,000 t |
| Large bored piles | 20 m |
| Slotted sealing wall | 44,000 m² |
| Retaining wall | 23,000 m² |
| Sheet pile anchoring | 12 m |
| Deep compaction | 28 m |
Web links
- Hohenwarthe lock, Magdeburg waterways construction department
Individual evidence
Coordinates: 52 ° 14 ′ 29.8 " N , 11 ° 44 ′ 21.7" E