In Sendling, a district of Munich, a remarkable project is taking shape with the construction of a new heat storage tank at the southern combined heat and power plant. The construction project impresses with considerable dimensions of almost 40 meters in diameter, a height of 50 meters and a gross capacity of approximately 57,000 cubic meters of district heating water.
For Stadtwerke, the project is an important contribution to the heat transition. It is expected that from summer 2025 the storage facility will take heat from the geothermal plant and the southern combined heat and power plant and feed it into the district heating networks. By balancing heat generation and demand, the heat storage facility ensures optimal energy use.
With Steel Master a round thing
The round foundation of the thermal store covers an area of 1,288m² and has a concrete height of 2m in the center. From the center to the outside with a height of 1.80m, a 1-percent slope was provided. In order to withstand the concrete pressure due to the enormous dimensions, a robust formwork system was required. In the course of the planning, Wadle Bauunternehmung GmbH decided the high-performance steel framed formwork Steel Master from RINGER. The system offers the optimum conditions for large-area forming with the crane and also copes with up to 80 kN/m² concrete pressure. By using Circular Forming Plates and Uni-Walers, curves can be realized without any problems. In this specific case, the curvature was implemented adjustably with inserted squared lumber and Master clamps.
A total of 87 main Steel Master elements (135 x 270cm) as well as a combination of other, smaller elements of various widths (30cm, 50cm, 60cm, and 90cm) were required to realize the entire foundation formwork in a single concreting section. All in all, almost 326m² of formwork element area steel master was planned. RINGER Push-Pull Props GR1 were used for a smooth set-up of the steel frame formwork.
The impressive reinforcement for the foundation amounted to a proud 400 tons of structural steel. Two concrete pumps were used to fill the extensive excavation pit. A total of 350 truckloads of concrete were placed in a meticulously timed three-minute cycle, with the entire concreting operation completed in 18 hours.
