We are looking for a contractor who provides planning services for the following service profiles of the fee schedule for architects and engineers (HOAI):

- Engineering structures, §§ 41 ff. HOAI,

- Structural planning, §§ 49 ff. HOAI,

- as well as other services according to the service description.

The planning includes the construction of a barrier-free transition. The preferred solution to be implemented provides for a 9-field integral structure with double-curved lines.

The former pedestrian overpass Josef-Hoeren-Straße crosses the Cologne-Mindener railway line and connects the districts of Stoppenberg, Altenessen-Süd and Katernberg.

The spanned track system is owned by Deutsche Bahn and RVR.

Due to the very poor condition of the building, economical renovation was not possible, which is why it was decided to demolish the building. The implementation of this measure is planned for the 1st quarter of 2021.

As part of a previous planning assignment, barrier-free solutions were developed, whereby a ramp solution has proven to be the preferred variant of administration and politics. This variant provides for an additional crossing of Köln-Mindener-Straße and a connection to the bicycle network in the Graitengraben area.

In addition to the implementation of a barrier-free transition and securing the district network, this route connection is intended to represent an essential component in changing the modal split in Essen's north-east in favor of the environmental network. According to the recommendation for bicycle traffic facilities (2010), the new building will therefore be equipped with a usable width of 4 meters. Due to the considerable development lengths caused by the existing topography, stairs for mobile road users should also be arranged on the respective earth ramps.

The preferred solution to be implemented provides for a 9-field integral structure with double-curved lines. Earthworks are planned for the stairways. The bridge construction should blend in with the surroundings. Since the bridge is in the immediate vicinity of the Zeche Zollverein site, it is intended to use Corten steel.

Since the planned structure is not a 1: 1 replacement new building, extensive preparatory measures are necessary. The bridge deviates from the currently established development plan. This includes forest areas that are affected by the project. Also, not all of the land is currently owned by the city.

The approval process has therefore already been initiated for the construction of the building. Due to the necessary forest interventions, a preliminary environmental impact assessment and a species protection assessment were carried out (see annex). These have shown that no significant negative effects on the ecosystem are to be expected. The lower nature conservation authority therefore has no fundamental concerns about the project. The specified framework conditions must be taken into account in the planning.

In the current planning documents, a drainage ditch is shown along the earthworks and the Graitengraben connection; this should be omitted in the course of further planning if possible, in particular to prevent interventions in the compensation area that has already been established.

The edge of the forest on Josef-Hoeren-Straße will be torn open by the new bridge structure. In order to develop a stable and low-maintenance forest in the edge area (along the road or the new bridge) behind the new structure in the long term, a correspondingly broad, stepped forest edge should be built. This requires the felling of further trees and new plantings on a wider strip.

The planned measure has also already been presented to the Zollverein advisory committee in order to determine its compatibility with the Zollverein listed building. The project was evaluated based on the criteria of a cultural heritage impact assessment (KVP). The assessment shows that the exceptional universal value (OUV) of the Zollverein World Heritage Site will not be adversely affected by the project. Some suggestions for planning were made by the members of the advisory body. I.a. handrail lighting is recommended. Possible concepts are also to be examined with regard to conservation-friendly lighting.

For the area likely to be affected, aerial photo evaluations have already been requested and created.

A bored pile foundation is planned for the structure, ie earthworks will be carried out with considerable mechanical loads. Security detection is required in these areas.

Since the area evaluated is a so-called bomb drop area, an area detection is also generally required if a soil intervention that does not involve significant mechanical stress is planned.

Therefore, should the area be pushed off and compacted, for example before the area is filled for the earth ramps, area detection could be considered. This makes sense if the ground is pushed back to the level of the ground and terrain in 1945 and there are no disruptive factors including an overlap area of 5m in the ground.

If, however, no soil intervention is to be carried out on the area, but the soil is to be heaped up, area detection is unnecessary here.

As part of the planning, it should also be noted that there are specific suspected dud points on the site. The currently valid version of the leaflet for building ground work must be observed.

The scope of services includes both object planning (engineering structure) and specialist planning (structural engineering) as well as some special services that are specified in the specification of services. The existing planning (HOAI Lph 2) must be adapted and updated, taking into account the framework conditions specified above and in the specification of services.

The construction process, including the respective construction phases, must be planned in detail and interventions in the environment must be kept to a minimum. The construction process is to be recorded with a detailed schedule so that blocking times of the track system can be requested, taking into account the reserve times.