Building against floods

At the Conference of Environment Ministers in October 2014, over eighty flood protection measures were identified and adopted in the National Flood Protection Programme. Rädlinger Bauunternehmen in Cham and the Rädlinger civil engineering team were commissioned with several projects to implement controlled flood retention or dike relocation.

Concrete wall and earthwork protect Cham against Regen flooding

700m of flood protection is currently being erected in the middle of Cham. The civil engineering and construction teams are jointly erecting a 580m concrete wall and a 120m earthwork, which will safeguard the Floßhafen and Brunnendorf areas against floodwaters in the future. However, before they could really get cracking, the bomb disposal team had to be called in, because, at the end of the war, parts of the Regen were filled up with rubble and whatever was left over from the war. After this had been done, the flood protection wall works could begin: the minimum 7m-deep bored piles had to be installed. These serve the purpose of providing a stable foundation to the flood protection wall made of 460m³ of concrete. The structures to be installed also required the expertise of Rädlinger employees. In addition to the protection wall, a pumping station was constructed within approx. 1,000 running metres of the boring poles on the landside of the dike. However, a watertight sheet-pile wall construction had to be rammed into the ground beforehand to retain the water. This was also the case for the three slide valve shafts and the drainage pumping station with outlet structure, for which gravel was temporarily heaped into the Regen. Upon completion, a staircase-shaped waterside promenade with green terraces, cycle paths and pavements will be set up along the approx. 2m-tall wall, which will ensure that only a small part of the wall (approx. 40cm) will be able to be seen from the landside.

Flood protection with added value in Reinhausen on the Danube

For Federal Minister Ulrike Scharf, the Reinhausen flood protection section in Regensburg combines beauty with utility. The measures included the establishment of a flood protection wall and the redesigning of the banks of the river and the waterside promenade along the Obere and Untere Regenstraße (Upper and Lower Regenstraße). The latter was completed by Rädlinger Bauunternehmen: for the purposes of redesigning the road area, 4,700m³ of earth was removed, 1,800m of edging and gutters were demolished and 1,800m³ of pipeline construction trenches were constructed. The team also set up an inland drainage system on-site by means of pipes and a pump well. In order to increase the attractiveness of the waterside promenade, bordering areas were designed as so-called “balconies and boardwalks”. Rädlinger completed the road construction works and the adaptation of the access roads, the asphalting and the pavement laying. By redesigning the bank and promenade, there is now not only necessary infrastructure, but also added value for the residents with bathing bays, seating areas and new cycle paths and pavements.

Flood protection wall on the Perlbach in Windorf

In Windorf, the civil engineering division erected up to 4m-tall flood protection walls made of reinforced concrete on both sides of the Perlbach; these will protect the inhabited areas against flooding together with mobile stop log systems. The stability of the walls is ensured by bored piles with lengths of approx. 550 running meters. It was also necessary to improve approx. 2,500m³ of soil with hydraulic binding agents. To protect against flooding, the stream was also near-naturally extended to a length of 400m and its banks were modelled accordingly. Despite delays due to considerable explosive ordnance residues and flooding of the construction site, the civil engineering employees were able to complete the measure on-time.

Dike relocation on the Danube near Mariaposching

After a record number of floods in 2013, there were many discussions about the lack of water retention areas. Rädlinger Bauunternehmen from Cham are currently working on the relocation of a dike in Mariaposching on the river Danube. This will create soft and hardwood floodplains, which provide approx. 500,000m³ of additional retention volume. The new earth-formed dike has a length of 1,123m, provides greater structural stability and will thus protect the Sulzbach polder against a 100-year flood event in the future. Rhein-Main-Donau AG are opting for a hybrid dike structure made of gravel and the slightly improved material already available at the construction site for the first time. From roughly 80,000m³ of soil ablation, approx. 50,000m³ of this material can be reused. To ensure that the subsurface was settled in a controlled manner, an idle time of at least 35 days between two successive fills had to be complied with. Using the layered material with extremely different compositions from the old dike was particularly demanding. Since the material had to be directly installed in different zones of the future dike depending on quality in the course of the relocation and without temporary storage, a pre-emptive approach was required in order to maintain continuous construction progress and furthermore to be able to manage the ever-present risk of a flood or rising groundwater.

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