impermeabilizzazione

Lee Tunnel, London

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The Lee Tunnel is one of the two pipelines that convey an average of 39 million tons per year of wastewater, coming from 35 sewer pipes, built in the Victorian era as part of the network that still serves London, after 150 years.

The works began in September 2010 at the Beckton treatment plant, with the construction of the first of the four 80-meter wells, waterproofed by laying DRYset channels in the joints, then sealed with DRYflex resin injections.

The sections of the 120-meter-long milling machine were then lowered through the shaft, which in 2012 began excavating the connection tunnels, with a diameter of 7 meters.

The infrastructure is part of the strategic plan to improve and ensure the health of the Thames waters. The system routes discharges from London’s largest surplus sewer to Mills Abbey Pumping Station in Stratford, which handles 40 per cent of the total waste.

The four miles of tunnel were built beneath the Borough of Newham, from Abbey Mills to Beckton. The new tunnel helps prevent more than 16 million tonnes of sewage mixed with rainwater from overflowing into the River Lee each year, capturing and transferring it to Beckton’s sewage treatment facilities, which are in turn being expanded by 60 per year. one hundred to cope with the increase in volumes handled.

This is the deepest tunnel ever built in London. This involved excavating in conditions of high groundwater pressures, along four miles of extraordinarily abrasive soil and without lateral vent pipes.

Owner: Thames Water Utilities

Structure: Engineer Emmanuel Costes, London

Construction: Morgan Vinci Bachy JV, London

Waterproofing: Drytech UK, London

Milan subway restoration

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Drytech has rehabilitated some sections of the Milan underground, during the night closure of the service, therefore without interfering with the normal circulation of trains.

The interventions were carried out with injections of DRYflex expanding resin in the joints between the slab and the inverted arch, for the entire thickness of the concrete structure of the tunnel.

The DRYflex resin is effective even in the presence of pressurized water. This made the intervention possible despite the enormous extent of the infiltrations.

Line 2 of the MM was built between the end of the 60s and the 70s without waterproofing, because the water table was much deeper. The closure of the Milanese manufacturing activities in the 1980s reduced water consumption and raised the level of the aquifer up to the tunnels of Line 2.

The infiltrations are controlled by pumping systems active 24/7, but in periods of heavy rainfall some sections were flooded. A series of waterproofing interventions for some tunnels was thus decided, carried out by Drytech between one and five in the morning.

Algiers subway restoration

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Drytech has rehabilitated 5 tunnels and 5 stations of the Algiers metro, for a total of 4 km.

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 Society – 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 renovation 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.

Hanging swimming pool, Ascona

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Overlooking Lake Maggiore, immersed in the woods above Ascona, the house with a hanging pool designed and designed by engineer Bonalumi for himself.

The pool occupies part of the top floor and, from the water, the view sweeps across the entire lake.

The bottom of the pool is the slab of the master bedroom.

The structure is a Drytech Tank in exposed waterproof concrete, with the edge of the pool completely covered with the Drycoat waterproof covering.

Project: Pianifica SA, Locarno

Pool and aquatic garden, Vernate

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Infinity pool surrounded by an aquatic garden, also infinity.

With a breathtaking view of Lugano Lake, this suggestive swimming pool is a Drytech Tank with three walls against the ground and one – on the lake side – completely exposed.

Project: Franzi and Canetta Architects, Noranco

AlpTransit Control Center, Pollegio

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The Polleggio Operation Center manages the railway traffic of the Gotthard and Monte Ceneri base tunnels.

Known as “The Periscope” for its futuristic architecture, the POC is one of the four SBB operating centers in Switzerland, together with the ultra-modern centers of Lausanne, Olten, Zurich.

Height and shape of the building are the architectural response to two functional constraints.

The POC marks and declares the entrance to the Gotthard base tunnel. It is a symbol.

To be perceived as such by the railway and the motorway it was developed in height.

The second constraint is the dimensional incompatibility between the control room and the type of an office building, which has led to accepting the contrast and expressing it in a radical way. Thus, the double-height slab of the control room is grafted onto a trunk of office space, arranged diagonally on the lot.

The POC therefore appears as a sculptural object animated by a twist between the two volumes.

Seen from a moving vehicle it transforms, changing its proportions and offering different states of balance.

Client: Canton Ticino logistics section

Project: Architect Bruno Fioretti Marquez, Berlin

Structure: Ingg. Borlini & Zanini, Pambio Noranco

Construction: CSC, Lugano

Waterproofing: Drytech Ticino, Bedano

Drytech Tank: 711 m²

Prefabricated underpass, Crema

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The railway underpass of Indipendenza street in Crema allows the passage of a road and a cycle path under the railway path. The work was carried out without interrupting the overlying passage of the trains.

The Drytech Tank made it possible to prefabricate the monolith near the tracks and push it to its final location with an excavation that gradually replaced it for the ground supporting the railway line.

Once positioned in place, the monolith was waterproofed in its critical points (cracks and joints) with DRYflex expanding resin injections.

Made ex-post, the waterproofing did not risk being damaged during the launching operations.

The expansion joints were prepared with DRYset injectable waterstop tapes.


Structure: Ing. Terzini, Crema

Construction: De Fabiani Spa, Cavenago d’Adda

Waterproofing: Drytech Italia, Como

Drytech Tank: 3’600 m²

CPC Gym, Chiasso

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The CPC double gym in Chiasso is the victory of lightness over weight, interaction over separation, flexibility over rigidity.

The duality between the podium and the covering volume of the room is defined by a detachment, produced by a punctual support on all four sides.

Through this suspension, the monolithic volume appears very light, to the point of seeming to be held back – rather than supported – by the four lateral Vs.

The detachment connects the interior space with the urban and natural elements that surround the gym. An interaction that places it in the context of the school and cultural campus, weaving various relationships with the peculiar elements of the place.

The building reacts to different situations and topographical differences. To the north it has an access terrace, in relation to the school buildings and access from the public car park. To the south, a flight of steps in relation to the small garden.

A delimitation of the road field and the existing square to the east. Finally, it is at the same level as the m.a.x Museum and the Spazio Officina, sharing their public vocation.

The podium is a Drytech tank. The insulation of the internal facades is protected by an exposed wooden strip in the lower part and by an acoustic paneling in the upper part.

From an energy point of view, the building meets the criteria of the Minergie standard.


Client: Canton Ticino logistics section

Project: Architects Nicola Baserga and Christian Mozzetti, Muralto

Structure: Engineers Andrea and Eugenio Pedrazzini, Lugano

Construction: Mafledil, Osogna

Waterproofing: Drytech Ticino, Bedano

Drytech Tank: 2’128 m²

Trenord railway underpass, Saronno

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Then the excavation and casting of the Drytech waterproof concrete slab was carried out, resting on the bulkheads and prepared with the DRYset crack control elements. The whole operation took place in just three days, at the end of which the track was restored.

The procedure was therefore repeated on the other track. After another three days the line returned to full capacity, with both tracks open.

The excavation was then carried out under the slab, the casting of the platform floor of the underpass and finally the lining casting, directly against the micropiles.

When the concrete matured, joints, holes and programmed cracks were injected with DRYflex resin which, expanding, sealed them by pressure.

Drytech Engineering provided advice on aspects relating to waterproofing, collaborating with the structural engineer already in the design phase of the underpass.

Ownership: Trenord Railways, Milan

Structure: Studio I.R. Joined Engineers – Ing. Giuseppe Barbagallo, Catania

Contractor: SALCEF Spa, Rome

Waterproofing: Drytech Italy

Drytech Tank: 1,800 m²

Allianz Isozaki Tower, Milan

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The Isozaki Tower, inspired by Constantin Brancusi’s endless column, has become one of the symbols of the city. Designed by the Japanese architect Arada Isozaki together with the Italian architect Andrea Maffei, the skyscraper is the headquarters of Allianz in Italy.

The building, which can accommodate up to 3,800 people, is the tallest skyscraper in Italy by number of floors (50) and according to the highest occupied floor criterion (with its 207 m).

Drytech has designed the waterproofing of all the structures below the project ground level. The fire-fighting tanks, the system tunnels, the multi-lancet windows and the lower sections were therefore built with the Drytech Tank technology.

Client: CityLife s.p.a., Milan

Project: Architect Arata Isozaki, Tokyo / Architect Andrea Maffei, Milan

Structure: Prof. Marco Mola, Ing. Michele Cap, Milan / Ing. Francesco Iorio, Bergamo

Works Management: In.Pro srl, Turin

Waterproofing: Drytech Italy

Drytech Tank: 7,400 m²