B u r i e d s t r u c t u r e s - S t r u c t u r e s - F l o o r i n g - F a c a d e s - R o o f i n g - A c c e s s o r i e s

TORNO INTERNAZIONALE S.P.A.HEAD OFFICESTAINLESS STEEL ENVELOPE

Client: Torno Internazionale (I)

Main contractor: Torno Internazionale (I)

Architects: Dante O. Benini & Partners Architects (I)

Consulting engineers:

DLC (I), Arup (I)

Contractors: Lorenzon Techmec System (I), Stahlbau Pichler (I), Metalsigma Tunesi (I), Somec (I)

Location: Via Valtellina, Milano, Italy (I)

Completed in 2006, the “Valtellina” office complex houses the headquarters of Torno Internazionale SpA, a leading Italian construction company. This project, like any major urban renovation operation, extended over several years, and consisted of the successive rehabilitation of several structures. The final complex comprises two buildings that are very different in nature and function. The first building, the subject of an earlier project, stands in the place of a former building of which only the structure was retained to serve as the skeleton of the new building. Backing onto this first building’s blind wall stands the second part of this complex. The originality of the latter project lies in its architectural integration: a large steel sail, falling from the top of the building, envelops the

underlying structures and progressively integrates them into the surrounding buildingscape. An immense 40-metre tall glass and steel hub that houses the lift system connects the two buildings. A common feature of all these buildings is the extensive use of stainless steel. The first is distinctive for its shield of micro-perforated sheet designed to conceal a pipe network. In the second, it is this immense sail that is striking, and the some 30 tonnes of stainless steel that were used in its construction. Selected in an EN 1.4404 (316L) type grade suited to urban environments, the product employed, Ugitop® from UGINE & ALZ, was adopted by the designers above all for its surface finish: with a uniform matt finish, it prevents any reflection on the buildings.

Housing - Offices, retail premises - Public facilities - Bridges - Civil engineering structures - Industry, storage, energy04©

Dav

ide

Dol

cini

© D

avid

e D

olci

ni

Residenza - Uffici, spazi commerciali - Edilizia pubblica - Ponti, passerelle - Opere infrastrutturali - Edilizia industriale, energia

B u r i e d s t r u c t u r e s - S t r u c t u r e s - F l o o r i n g - F a c a d e s - R o o f i n g - A c c e s s o r i e sB u r i e d s t r u c t u r e s - S t r u c t u r e s - F l o o r i n g - F a c a d e s - R o o f i n g - A c c e s s o r i e s

Indicative chemical composition Mechanical propertiesC Cr Ni Mo Rp 0.2 Rm A

< 0.03 16.80 10.30 2.10 ≥ 220 MPa ≥ 530 MPa ≥ 40 %

UGITOP®

AUSTENITIC STAINLESS STEELSUGINE & ALZ ARCELOR GROUP

Rp: yield strength Rm: ultimate tensile strength

A: elongation 1 MPa = 1 N/mm²

Housing - Offices, retail premises - Public facilities - Bridges - Civil engineering structures - Industry, storage, energyN

on-c

ontra

ctua

l doc

umen

t

UGITOP®

a range that is ideally suited to the requirements of roofi ng and facades.

Product: Ugitop®

Grades: EN 1.4404 (European standard) AISI 316L (US standard)

Supply options:

Thickness: 0.5 to 2 mm

Width: dependent on thickness, max 1250 mm

Grades: EN 1.4301 (304), EN 1.4404 (316L)

Applications: Roofing, facade

Company: Arcelor UGINE & ALZ

UGINE & ALZ is involved in stainless steel production, processing and distribution. The company provides:

One of the stainless steel market’s most extensive offers- a comprehensive range of stainless grades, tailored to the requirements of construction sector designers and contractors - hot-rolled and cold-rolled products- a range of product forms and dimensions (coils, sheets, blanks…)- a very wide range of surface finishes, from bright-annealed to matt

Globally recognised specialties - ferritic steels- bright annealing- 2000 mm wide strip for certain grades

Associated servicesThe offer also incorporates a spectrum of associated services ranging from coil finishing operations to «just in time» delivery as well as technical support from the client’s project design stage through to completion.

Aesthetics In particular, it is for its surface finish that architects especially appreciate the Ugitop® product range. With a uniform matt finish, permanent and durable from the moment it is installed, it was specially developed to meet the needs of designers who wish to prevent light from reflecting on their buildings.

Ease of processingUgitop® products are welded using traditional techniques and, with the use of no tooling other than that traditionally employed by professionals, enable all methods of processing: installation with standing seam, bending, shearing, profiling, curving operations, etc. This material is easy to work, even at

temperatures close to 0°C. A beneficial expansion coefficient permits assembly in a single length of strips up to 20 metres long. This material’s light weight, 3 or 4 kg/m², enables it to be used in conjunction with light framing. It is compatible with most other materials.

Durability and long-termeconomyIn addition to its elevated mechanical properties, Ugitop® guarantees excellent corrosion resistance. Environmentally friendly, it is a non-polluting, 100% recyclable material. Biologically inert, it is employed in water reclamation systems. Economic over the long term, it is among the most competitive products in the traditional roofing market.

B u r i e d s t r u c t u r e s - S t r u c t u r e s - F l o o r i n g - F a c a d e s - R o o f i n g - A c c e s s o r i e s

STAINLESS STEEL AND PERFORATED SHEET

Housing - Offices, retail premises - Public facilities - Bridges - Civil engineering structures - Industry, storage, energy

Perforation of steel is carried out by cold punching using mechanical presses. Stainless steel lends itself perfectly to this processing. When damaged, its protective layer re-forms of its own accord simply through contact with air. Not only does use of this material obviate the need for post-perforation anti-corrosion treatments, often difficult to perform on parts that are already perforated, but above all, the product obtained can, without any risk of corrosion, undergo any subsequent operation such as cutting, drilling, bending, welding, etc. Due to energy efficiency considerations and the light and shadow effects that it permits, perforated sheet is increasingly employed in architectural applications: facades, cladding, sunbreakers... This project serves as a perfect illustration. In two instances, the architects had recourse to this range of products: firstly, for the renovation project on the former building, in order to conceal from public view aspects considered to be unsightly (pipework); secondly for the steel sail that enfolds the building, the entire central portion of which was executed in perforated stainless steel. By day, this sail functions as a passive protective shield, filtering the light and protecting the occupants from excessive sunlight. By night, under the effect of the interior lighting, it becomes more transparent and ethereal, and progressively evanesces, revealing the structures that it conceals by day.

© T

oni N

icol

ini

© T

oni N

icol

ini

© N

icol

a G

iaco

min

Micro perforated sheet - detailsUgitop 20/10 AISI 316L

Construction: Metalsigma TunesiDesign: Dante O. Benini & Partners Architects

B u r i e d s t r u c t u r e s - S t r u c t u r e s - F l o o r i n g - F a c a d e s - R o o f i n g - A c c e s s o r i e s

Housing - Offices, retail premises - Public facilities - Bridges - Civil engineering structures - Industry, storage, energy

A STAINLESS STEEL SAIL

Innovative steel solutions in tune with your creativity and providing solutions tailored to all your requirements: architectural trim and hardware, concrete reinforcement, roofing, facades, civil engineering and bridges, floors, structures...

Bespoke technical support provided by an international team of professionals, BCS (Building & Construction Support), who provide you with support from the design stage to the completion of your project.

A reference tool on the Internet that furnishes you with the complete catalogue of more than 400 Arcelor group products with all their applications, as well as many other sections to contribute to your creativity

www.made-of-steel.com © A

rcel

or B

uild

ing

& C

onst

ruct

ion

Supp

ort -

All

right

s of

rep

rodu

ctio

n, tr

ansl

atio

n an

d ad

apta

tion

rese

rved

for

all c

ount

ries

Building & Construction Support19, avenue de la LibertéL-2930 Luxembourgwww.arcelor.com

BCS Offices: Paris - Brussels - Cologne - Madrid - Milan - Sao Paulo - Warsaw

contact@constructalia.com www.constructalia.com

The project’s principal originality is the large steel sail that envelops this building and also bestows its complexity. Consisting of juxtaposed quarter spheres, it forms a concave ski-jump of more than 1200 m2, which abuts on the existing building, superimposed in places upon a primary glass envelope. Tubular components, rising obliquely from the ground, provide additional stability. In both form and function, they evoke the spars carrying this sail.

With micro-perforations in its central portion, this sail is punctuated higher up by glazed surfaces. Beyond, the roof consists of solid sheet. At the top of the building, its uppermost portion comprises a standalone triangular crown. It consists of a steel primary structure on which is superimposed a waterproof insulating layer covered with an aluminium secondary grid, on top of which rests the stainless steel.

Construction details: Metalsigma TunesiDesign: Dante O. Benini & Partners