Germany - A new district for around 16,000 people is being built in Freiburg Dietenbach. Dam

Description

A new district for around 16,000 people is being built in Freiburg Dietenbach. This makes it currently one of the largest new development areas in Germany. As part of the external development measures, piping work for drinking water and district heating must be carried out. In addition, preparatory work (empty conduit work) must be carried out for electricity. The entire pipeline route runs through the Betzenhausen district and the Zinklern construction area, crossing the Dreisam and the B 31a federal highway. The crossing of the B 31a is considered in this measure. The crossing of the federal highway takes place north of the Paduaallee entrance/exit and is to be constructed using a trenchless method. A microtunneling method with a flushing circuit is planned. A total of three DN 1000 pipe crossings are to be constructed, through which the media pipes (district heating, drinking water and electricity) will be pulled. The DN 1000 casing pipes have a pipe cover of approx. 1.93 m to 2.23 m (start pit area) and 2.26 m to 1.23 m (target pit area). The level of the excavation pit bottoms is approx. 231.11 m above sea level (target excavation pit) and 231.28 m above sea level (starting excavation pit). The HGW determined is 230.40 m above sea level, meaning that parts of the pipe crossing and parts of the excavation pit enclosure are in the groundwater or groundwater change area. To drain the excavation pit, a watertight excavation pit enclosure is planned using a reinforced, closed sheet pile wall and underwater concrete base including residual water drainage. The passability of the service roads during the construction period must be guaranteed. Against this background, temporary construction pit bypasses are to be constructed in the start and finish pit areas.

Opportunity closing date

29 November 2024

Value of contract

to be confirmed