Opened in 2002, the Badeland leisure pool in Wolfsburg consists of the sports pool (50-metre pool, diving tower and non-swimmer pool), the fun pool (Mediterranean pool, wave pool, slide tower, whirlpools and toddler pool) and the sauna area (on two levels with 11 indoor and outdoor saunas). Facilities also include catering, wellness and fitness areas.
A comprehensive renovation of the entire bath is required. The upcoming renovation is based on a feasibility study from 2022. The subject of the present award is the technical equipment in accordance with HOAI 2021 §55 in the area of bathing facilities (sub-area facility group 7.1 according to HOAI 2021 Annex 15).
The water treatment systems in the Badeland leisure pool are divided into filter centres FZ1 fun pool, FZ2 sports pool and FZ3 sauna area. Common facilities are the central sludge water treatment (SWA), electrolysis plant, compressed air supply and purge air blower.
The process of the bath water treatment plant is systematically structured according to pre-filtration, adsorption, flocculation, filtration and chlorination. Closed multi-layer filters according to DIN 19605 were installed.
In order to maintain the intended operation, some partial renovations have already been carried out. The measures that are still pending are to be implemented in sections; a renovation with complete closure is also not excluded.
In advance, an overall view of the bathing water technology in terms of structure and function as well as interfaces and dependencies to other trades must be drawn up as part of the basic determination and preliminary planning. For this purpose, a review of all existing plant components - including any necessary adaptation measures of technology that has already been renovated and to be renovated - must be carried out (inventory). As part of a general renovation of the pool that will follow later, a uniform, coherent concept with regard to the tasks and functions of bathing water technology is to be developed step by step.
Partial remediation measures have already been carried out for the following plants: electrolysis plant; Shafting.
An examination of the scope and sequence of the subsequent planned partial remediation measures must be carried out before the overall remediation of bathing water.
The planning services to be awarded relate to the following (individual/partial) measures:
1.) Refurbishment of filter control centres 1, 2 and 3 (FZ1 - area of the fun pool, FZ2 - area of the sports pool, FZ3 - area of the sauna): renewal of water storage tanks, circulation pumps, control cabinets/BMS, compressed air system control air supply as well as partial renovation of the SWA pipe network, city water pipe network and heating network to the heat exchangers for bathing water technology). The implementation of the measures may be brought forward in individual areas.
2.) New planning of the sludge water treatment plant: In the existing central sludge water treatment plant (SWA), the backwash water from the bathing water filters of the filter centres was collected in the sludge water tanks, cleaned and buffered in a central pure water storage tank. The water from this tank was discharged to the bathing water circuits of the filter centres. The central SWA for FZ1 to FZ3 was taken out of service and partially dismantled in 2022 due to technical defects. This processing plant must be redesigned in accordance with the state of the art.
3.) Renovation of the Mediterranean pool (separation): The Mediterranean pool with indoor and outdoor pools is supplied via a circuit. During the planning phase, a hydraulic separation of the indoor and outdoor pool or the system must be carried out. Variant studies for energy saving for the outdoor pool are required.
As a result of the measures, state-of-the-art technical systems should be available, which will enable economical and resource-saving operation for many years. The aim is also to optimize plant technology as a climate change adaptation strategy.
The feasibility study (author: pm.a - agn Niederberghaus & Partner GmbH, Ibbenbüren 09/2022) is part of the tender documents as the basis for planning. The planning must be reviewed and, if necessary, optimized - especially with regard to any economic/energy savings potential - and implemented in whole or in part.
In summary, the planned construction measures are as follows: 1. Type of building: sports and leisure facility; 2. Type of construction project: Rehabilitation of bathing water technology; 3. GFA: approx. 22,350 sqm; 4. Indoor water areas: approx. 2,900 sqm; 5. Estimated costs (as of 2022) KGr 472 in the area of bathing facilities: approx. EUR 6.95 million net (cost status 09/2022, excluding any necessary interim/emergency measures).
The intended assignment includes the technical equipment according to HOAI 2021 §55 for bathing facilities (plant group 7 according to HOAI 2021 §53) including related system automation (AGr 8 according to HOAI 2021 §53): almost all basic services service phases 1-9. In addition, selected special services are commissioned, to the extent and if necessary; in LPh 1, an inventory of the plants / plant components is first required.
The award is made in stages (see also II.2.11). Optional services: see section II.2.11. There is no provision for a lot-by-lot allocation.
The following documents are available and are part of the tender documents, which can be accessed on the Internet (see para. I.3): Feasibility study (author: pm.a - agn Niederberghaus & Partner GmbH, Ibbenbüren 09/2022); Draft contract incl. selected plants.
Knowledge of these documents is not required for the application process. In the 2nd stage of the procedure, further documents are made available to the selected companies (see section II.2.11).
Expected timeframe: 1. Commissioning 11/2023; 2. Realization (in construction phases) by 2031; 3. Subsequent project completion. The exact completion date will only be agreed and determined in the course of work phases 1 and 2.