Algiers subway restoration

ytech restored the waterproofing of 5 tunnels and 5 stations of the Algiers metro, sealing over 4 km of underground tunnels.

Drytech restored the waterproofing of 5 tunnels and 5 stations of the Algiers metro, sealing over 4 km of underground tunnels.

The proximity to the sea exposes the structure to a water table of 6-8 meters.

During the construction phase, various systems were used to waterproof tunnels and stations, but none of these managed to guarantee 100% waterproofness.

Hence the need for definitive reorganization. The Algerian Ministry of Transport has commissioned the Eurometro company – London consultants specialized in the subway sector – to identify a solution to the problem of infiltrations.

After a worldwide survey, Eurometro proposed the Drytech Restoration System, based on injections from the inside of the DRYflex acrylic resin structure.

The Line 1 tunnel is made up of 10 meters long waterproof concrete segments, connected by 2 recovery joints interspersed with an anti-seismic movement joint.

Waterstop tapes were inserted into the joints, which only worked in 45% of the joints.

The joints of the adjacent structures, of the stations, of the ventilation ducts etc., were instead waterproofed with bentonite expansive profiles, the expansion of which however proved to be limited compared to the shrinkage of the concrete.

Even the jet shots at the air intakes showed infiltrations.

The thermal changes to which they are naturally exposed produce structural movements that split the polyurethane used to waterproof them.

Polyurethane, in fact, being semi-rigid and adhesive, undergoes the movements of the structure and, when they are particularly large, it cracks or loses adhesion.

Finally, shrinkage cracks were produced in the concrete which represented as many points of permeability of the structure.

The Drytech rehabilitation intervention for the waterproofing of the Algiers Metro was cataloged with the REAL system of Sir of Turin.

The application creates a virtual reconstruction of the structure, with all the information relating to the remediation intervention.

An X-ray that allows a quick and interactive consultation of images and data relating to the individual interventions performed.

Sant’Anna Hospital, Como

The new Sant’Anna hospital in Como is located on an area of ​​over 80,000 m² south of the city of Como and a few hundred meters from the headquarters of Drytech Italia.

The Como Polyclinic has two underground floors exposed to a 2-meter flap, which will also house the operating theaters.

The waterproofing was carried out with the Drytech Tank System which, among other things, due to its construction characteristics and organization, ensured a significant reduction in days in the overall construction site budget.

The activities of the Drytech Tank System, in fact, are parallel to the others of the construction site so that, in fact, the waterproofing item has been removed from the work calendar.

To support the weight of the structure, the site of the construction site was consolidated with approximately 4000 reinforced concrete poles, with a depth varying between 20 and 30 meters.

The poles were thrown into shirts driven into the ground with micro-explosions.

Contractor: Infrastrutture Lombarde

Project: Euro-Project

Structure: Eng. Franco Mola, Milan

Construction: Consorzio S.AN.CO

Borgo alla Marina, Genoa

The conversion of the industrial port area, west of the Genoa airport, also involves the construction of the Borgo alla Marina residential complex.

200 prestigious apartments, with relative berths and garage, overlooking a new tourist port.

Under the buildings and the square, in direct contact with the sea water, the covered parking for residents is built with the Drytech Tank System.

Project: Studio Gnudi, Genova

Contractor: Aurora Costruzioni, Milano

City by the Sea, Savona

Excellent news for the sky arrives from the sea.

The residential center La Città sul Mare in Savona, in fact, heats up in winter and cools down in summer by exploiting the sea temperature.

The plant is zero-emission and, using a renewable and free resource, provides a definitive solution to the problems of atmospheric pollution and the soaring costs of fossil energy sources.

The Savonate housing complex was built by Meraviglia Spa of Bulgarogrosso (CO) and was designed by the Technion Srl and Ellevi di Lecco design studios.

The 120 apartments are served by a heating system connected to a sea outlet, built on the boulder pier facing the complex.

The basic principle of the system is the substantially constant temperature of the sea water (about 18 ° in this stretch of coast).

The pipes of the heating and air conditioning system from the building run underground to the sea intake, where the heat pump is located, which uses sea water as a source or as a heat sink.

The transport of thermal energy takes place through the same water. Water that is sucked from the sea, brought up to the heat exchanger and, therefore, released.

The system has a positive energy balance: it supplies more energy (heat) than electricity needed for its operation (the ratio is at least 1 to 4 or higher, up to 1 to 6).

In addition to the seawater intake, the two floors of the Città del Mare underground car park are also made with the Drytech Tank Waterproofing System, which is exposed to a 5-meter water table, as can be seen from the pressure of the jet that comes out of the pump well in the third image.

Structure: Technion and Ellevi, Lecco

Construction: IMM, Milano