Cycle and pedestrian path Bottwarbahntrasse, Heilbronn city Lot 2 – Lerchenbergtunnel

By expanding the disused section of the Bottwarbahntrasse, the city of Heilbronn will receive a new cycle and pedestrian path connection. The planning of the pedestrian and cycle path on the Bottwarbahntrasse represents a continuous, comfortable and almost car-free cycle and pedestrian traffic infrastructure connecting the university in Sontheim via the Südbahnhof to the east of Heilbronn. Pedestrian traffic is separated from the cycle path by a green strip. The target image is the new Neckaruferweg between Knorrstraße and Wertwiesenpark. The route can be realized relatively cost-effectively, as the track ballast provides an optimal sub-base. The connection offers attractive infrastructure for commuters as well as students. The construction site comprises the section of the former Bottwarbahntrasse from the ramp at the level of Schwindstraße to the crossing of Charlottenstraße. The section "Am Südbahnhof" between Charlottenstraße and Cäcilienbrunnenstraße has already been developed as a shared pedestrian and cycle path and is therefore not included in the construction site. The construction site continues with the planned reconstruction of the Cäcilienbrunnenstraße intersection and ends with the ramp of the pedestrian and cycle path onto the existing cycle path in Jägerhausstraße. Considering the already developed pedestrian and cycle path between Rathenauplatz and Cäcilienbrunnenstraße (approx. 890 m) and the Lerchenbergtunnel (approx. 400 m), a superior cycle path connection between Sontheimer Landwehr and Jägerhausstraße with a total length of approx. 3.2 km is achieved. 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 both tunnel portals. It has a curve in its longitudinal section. Investigations have shown that the external stability is given. However, due to age, the tunnel lining shows signs of dampness, formwork marks, and breakouts. In its current condition, traffic safety for cyclists and pedestrians is therefore not guaranteed. Securing measures are a mandatory prerequisite for the reuse of the tunnel. The tunnel must be secured over its entire surface using drainage mats, sealing membranes, and sprayed concrete. The longitudinal tunnel drainage must be repaired. Preliminary planning for the tunnel already exists. Since the entire route, in addition to its pure connection function as cycle infrastructure, is also intended to provide a recreational space, bench locations and information pillars about the former Bottwarbahn, as well as light art and effect lighting in and around the Lerchenbergtunnel, contribute to an attractive space. A potential feeling of insecurity is thus reduced. Staircases are also planned at both tunnel portals for pedestrian traffic. The cycle path category can be classified as IR III according to ERA or RIN with a regional connection function. The target design speed is therefore between 15 - 20 km/h. The primary goal of the measure is to strengthen pedestrian and cycle traffic and close gaps in the existing pedestrian and cycle path network by creating a safe, comfortable, and fast cycle and pedestrian path connection. The needs of pedestrian and cycle traffic as well as accessibility must be considered in the planning: Cycle and pedestrian traffic should be separated. This is done along the route by a tactile separation strip or a green area. The width of the cycle path is consistently 3.0 m, and that of the pedestrian path is 2.5 m. The contract volume includes various engineering services, which are divided into three lots and each tendered separately EU-wide: Lot 1 – Cycle and pedestrian path route This lot includes the planning and construction supervision for the actual cycle and pedestrian path. Specifically, it concerns the object planning of traffic facilities (service phases 5–8), the object planning of engineering structures for drainage and staircases (service phases 1–8), the planning of open spaces (service phases 5–8), as well as local construction supervision and coordination of utilities as special services. Lot 2 – Tunnel (Lerchenbergtunnel) This lot includes all planning services related to the tunnel: object planning of engineering structures (service phases 3–8) and structural planning (service phases 1–3 and 6). In addition, mobile network coverage should be available in the tunnel; coordination and consultation with utility providers for the installation 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 of technical equipment, service phases 1–8) and the effect lighting will be awarded. A separate service description will be created for the effect lighting. The awarding in all lots will be carried out in stages.