Germany – Architectural, construction, engineering and inspection services – Rad- und Fußweg Bottwarbahntrasse, Stadt Heilbronn Los 3 – Tunnelbeleuchtung

By expanding the disused section of the Bottwar railway line, the city of Heilbronn will gain a new cycle and pedestrian path. The planning of the cycle and pedestrian path on the Bottwar railway line provides a continuous, comfortable and almost car-free cycle and pedestrian infrastructure as a link between the university in Sontheim, via the Südbahnhof, to the east of Heilbronn. The pedestrian path is separated from the cycle path by a green strip. The target image is the new Neckar riverbank path between Knorrstraße and Wertwiesenpark. The route can be realised comparatively cost-effectively, as the ballast provides an optimal base. The connection offers an attractive infrastructure for both commuters and students as well as schoolchildren. The construction site comprises the section of the former Bottwar railway line from the junction at the level of Schwindstraße to the crossing of Charlottenstraße. The section "Am Südbahnhof" between Charlottenstraße and Cäcilienbrunnenstraße is already developed as a shared cycle and pedestrian path and is therefore not included in the construction site. The construction site continues with the planned redevelopment of the Cäcilienbrunnenstraße junction and ends with the junction of the cycle and pedestrian path to the existing cycle path in Jägerhausstraße. Taking into account the already developed cycle and pedestrian path between Rathenauplatz and Cäcilienbrunnenstraße (approx. 890 m) and the Lerchenbergtunnel (approx. 400 m), a supra-regional cycle route is achieved between Sontheimer Landwehr and Jägerhausstraße with a total length of approx. 3.2 km. The renovation of the Lerchenbergtunnel is also part of this VgV procedure. It has its highest point in the middle of the tunnel and drains towards the two tunnel portals. In longitudinal section, it has a curvature. The investigations have shown that the external stability is given. However, due to age, the tunnel shell has moisture ingress, formwork and breakouts. In its current condition, the tunnel is therefore not safe for cyclists and pedestrians. Safety measures are a mandatory prerequisite for the re-use of the tunnel. The tunnel must be secured over its entire surface using drainage mats, sealing sheets and sprayed concrete. The longitudinal drainage of the tunnel must be repaired. A preliminary design for the tunnel is already available. Since the entire route, in addition to its pure connecting function as cycle infrastructure, is also to provide a space for recreation, bench locations and information pillars on the former Bottwar railway line as well as light art and effect lighting in and on the Lerchenbergtunnel contribute to an attractive space. This also reduces a potential feeling of insecurity. For the pedestrian traffic, staircase installations are also planned at both tunnel portals. The cycle route category can be classified with a regional connecting function in group IR III according to ERA or RIN. The planned design speed is therefore between 15 - 20 km/h. The main objective of the measure is to strengthen pedestrian and cycle traffic by creating a safe, comfortable and fast cycle and pedestrian path and to close gaps in the existing cycle and pedestrian path network. The interests of pedestrian and cycle traffic as well as accessibility must be taken into account in the planning: Pedestrian and cycle traffic should be separated from each other. This is done along the route by a tactile separator strip or a green area. The width of the cycle path is consistently 3.0 m, that of the footpath 2.5 m. The contract volume comprises various engineering services, which are divided into three lots and tendered separately in each case on an EU-wide basis: Lot 1 – Cycle and pedestrian path route This lot includes the planning and construction supervision for the actual cycle and pedestrian path. Specifically, it is about the object planning of the traffic facilities (phases 5–8), the object planning of civil engineering structures for drainage and staircase installations (phases 1–8), the planning of the open spaces (phases 5–8) as well as the local construction supervision and the line coordination as a special service. Lot 2 – Tunnel (Lerchenbergtunnel) This lot comprises all planning services relating to the tunnel: the object planning of civil engineering structures (phases 3–8) as well as the structural design (phases 1–3 and 6). In addition, mobile phone network should be available in the tunnel, the line coordination and coordination with line operators for the laying of corresponding cables or antennas is also part of this planning task. Lot 3 – Lighting Here, the technical planning for the tunnel lighting (specialist planning for technical equipment, phases 1–8) as well as the effect lighting according to the scope of services is awarded. The awarding of contracts in all lots is done step by step.