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District heating Lecco and Valmadrera


Client: Acinque
Project: New district heating network for the municipalities of Lecco and Valmadrera
Services: design, construction management and safety coordination
Location: Lecco and Valmadrera
Status: In progress
Year: 2019 - ongoing

Lecco district heating

The project concerns the construction of the urban district heating network planned to serve the municipalities of Valmadrera, Malgrate and Lecco.

The project involves the construction of a heat distribution network having a total length of about 16 km of double pipe, with pipe diameters varying between DN 400 mm and DN 50 mm (in addition to utility connection pipes). The functional design arrangement envisages that the network will be fed by two plants, located as follows:

  1. Silea S.p.A. waste-to-energy plant in Valmadrera (heat exchanger from steam extracted from turbine);
  2. polo firm Caleotto S.p.A. of Via Arlenico in Lecco.

The network construction project envisages the overall development of the backbones and distribution pipelines in four years from the start of construction (following executive design and obtaining permits); after that period, only minor extension works aimed at serving utilities and connection of SSTs are planned.

The heat distribution network is planned to be laid almost exclusively under the level of the public road under municipal jurisdiction.

In addition, the route of the network includes the following major crossings of road and rail mobility infrastructure, for which specific in-depth investigations have been carried out to define in detail the interference resolution projects

  1. RFI railway line crossing between via Vassena, via Fornaci and via XXV Aprile in the municipality of Valmadrera (Monza - Besana - Lecco line);

  2. RFI railway line crossing between via Gaggio and SS639 in the municipality of Malgrate (Monza - Besana - Lecco line);

  3. RFI railway line crossing in Amendola street in Lecco municipality (Milan-Lecco lines and Lecco-Bergamo line)

  4. RFI railway line crossing in Via Parini Municipality of Lecco (Lecco - Sondrio - Tirano line);

  5. SS36 crossing (urban tunnel section) at Via Fiandra and Via Marconi in Lecco Municipality;

  6. SS639 Via Provinciale crossing in the municipality of Valmadrera (Anas competence).

For the connection between the waste-to-energy plant and the built-up area of Lecco, it will also be necessary to cross the Adda River; this intervention has been the subject of specific investigations, technical analyses, and in-depth geological, geotechnical, and environmental studies. The design solution foresees the crossing with two DN200 pipes inside the cavity of the sidewalk on the west side (Lecco - Malgrate direction of travel, upstream side with respect to the river outflow) of the Kennedy Bridge itself.

The intervention also involves the crossing of several watercourses pertaining to the minor water reticulum (RIM) under municipal jurisdiction (in particular, the Caldone stream in Lecco) and watercourses belonging to the main water reticulum (RIP) under regional jurisdiction (in particular, the Riotorto stream in Valmadrera and its tributary, the Inferno stream); specific surveys and in-depth investigations have also been carried out for these interferences, and riverbed crossing arrangements have been designed in compliance with national and regional regulations on hydraulic compatibility and hydraulic police (in implementation of the PGRA Flood Risk Management Plan).