HBL  Swimming Pool Leinfelden

Competition Swimming Pool Leinfelden


Urban Concept

The urban planning idea of ​​the new indoor garden pool for Leinfelden-Echterdingen uses the topographical gains and stores the building mass in such a way that essential parts of the cubature do not appear. The access level follows the level of the public roads; the swimming area itself is on the lower level of the city garden. This enables different urban planning qualities to be achieved. On the one hand, the building mass above ground at street level negotiates with the heterogeneous grain size of school buildings, special uses and single-family houses. On the other hand, the swimming area and the upstream sunbathing lawn in the slightly lowered altitude will be shielded from the adjacent traffic, similar to the existing one.

The structure is based on the northern and southern building line of the existing pool; the east-west expansion uses the largest possible space between Stuttgarter Straße and Ludwig-Uhland-Schule. This made it possible to achieve the goal of proposing a compact and economical architecture that preserves the existing access and open spaces.

The high-quality open spaces of the existing bathroom can not only be preserved, but can also be considerably expanded in the area of ​​the access level. A spacious forecourt with low greenery, paved and water-bound area serves as a buffer area and meeting point. The foyer extends into the outdoor area not only for school and club operations in the indoor pool, but also for recreational sports.
The architecture structures and differentiates buildings according to their function and places them in a compositional relationship. The indoor pool, the foyer pavilion and the combined heat and power unit are arranged based on landscape and urban alignment. A significant axis that forms between the traffic area and the city or indoor pool garden is creatively activated and is an organizational and functional seam, access system and separating joint. It separates the parking in the south from the relaxation area of ​​the pool, leads from the outside into the glass-roofed main access axis of the indoor pool, and connects the foyer pavilion with the pool. The latter takes on the block-type thermal power station. It is a slim but self-confident high point in the pool structure, which is low in itself, which makes it a real eye-catcher in the urban space.


Exterior Concept

The tree population, which is worthy of preservation, remains complete. In addition, new trees will be planted in the area of ​​stationary traffic and the ideas section.
The sunbathing area of ​​the indoor pool is lowered in the vicinity of the south facade and restructured with terrace slopes along the existing site without damaging the tree population. The terracing enables spatial structuring and the delimitation of functional units, such as the topographically animated play area. The design of the terraces is determined geometrically and relates to the design concept of the architecture, including the functional seam. The paved area in the vicinity of the indoor pool enables various functional displays as well as a relatively clean area. The addition of a ramp to these areas enables barrier-free access to the outside area.
The existing parking of 40 parking spaces in the ideas section will be relocated to the north. For this purpose, the area in the area of ​​the underpass and the vacant caretaker's house will be adapted accordingly; the existing driveway can still be used and is now in the middle of the parking lot. This creates a generous open space in the south, which opens wide the desired portal to the city garden. The side of the area is planted with new trees. In between, a gently sloping meadow provides an unobstructed view of the park landscape. The new location of the bus stop is in the area of ​​the park entrance and thus ideally connects public transport to the urban recreational area. Students using public transport can also access the main entrance to the Ludwig-Uhland School via the Stadtgarten.
The green space to the north of the still existing fire brigade access can be extended to the street after the bus stop has been relocated and will otherwise not be affected by the project.


Functional Concept

The enlarged forecourt north of the foyer pavilion allows a guided view of the inside of the swimming and especially the jumping area before entering the indoor pool. A complete display of the interior with its smaller basins is deliberately avoided. The bathroom is entered through the foyer pavilion and leads behind a small porch area and through the automatic access control with the elevator barrier-free or via a spacious staircase to the changing wing. The boot walk is a series of collective changing rooms and three general changing room clusters that meet the guidelines for pool construction. An important element of the functional design is the glass-covered seam that organizes the barefoot walkway between the changing rooms and the sanitary area and the access to the swimming pool in the basement. In addition, the seam offers a direct connection to the outside area. The water areas are densely organized in the hall wing. The necessary pool surrounds and required room heights are met. The arrangement of the jumping area in a geometric intersection leads to considerable space savings, which can be offered as an open area west of the pool. The swimming pool and the children's paddling pool face the sunbathing area in the south, the teaching pool in the north area, which can be functionally separated during public operation. The pools are illuminated via the south and east facade, which ensures natural lighting and ventilation for each pool and provides a view of the lawn and the city garden.
In the second basement, the technical areas are consequently placed at the lowest point of the swimming pool and diving pool. The combined heat and power plant is ideally accessible from two sides of the facade in the north of the fire service entrance and in the west.


Construction- and Material Concept

The swimming pool is covered by a pre-stressed ribbed reinforced concrete ceiling. The other structural components can be created using conventional reinforced concrete. The transparent facades are post-and-beam constructions. Opaque facades are clad with three different ceramic panels. The roof areas of the foyer pavilion and the combined heat and power plant are extensively greened; the inaccessible hall roof is intensely greened and equipped with a PV system in the elevated area of ​​the jumping facility. The interior of the bathroom will be equipped with light, large-format ceramics and partially covered with porous cladding in order to meet the special acoustic requirements


Ecological Criteria

The TGA approach tries to achieve significant savings in the area of ​​energy consumption with the combined heat and power plant through the hybrid coupling of different systems. In addition, the roof area is partly equipped with a PV system. with hot water collectors as required. By means of simulations and responsive facade shading, a regulated heat input via the glass surfaces should lead to a further reduction in the heating requirement.
Swimming Pool
Project Start-End: 
2021/02 - 2021/05
Leinfelden-Echterdingen, Baden-Württemberg
Competition (invitation)

Kathrin Aste, Frank Ludin, Daniel Luckeneder

Peter Massin, Simon Paukner, Luis Navarro, Oliver Hamedinger