HOT DIP GALVANIZING 02/2020

The Hill House Box, Helensburgh | 2 Turó de la Peira Sports Centre, Barcelona | 6 Private House, Prague | 10 Great Arthur House, London | 14

International Magazine Benelux Edition ISSN 1363-0148 www.hdgmagazine.co.uk

HOT DIP GALVANIZING 02 | 2020

HOT DIP GALVANIZING

02 | 2020

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Editorial Beste lezers, In deze editie van ‘Hot dip galvanizing’ kunnen jullie opnieuw een aantal spraakmakende projecten ontdekken uit Europa waarin thermisch verzinkt staal is toegepast.

Toevallig zit er dit keer een project tussen dat me nauw aan het hart ligt. Wellicht hebben sommigen onder jullie het beroemde Hill House, het meesterwerk van Charles Ronnie Mackintosh in Helensburgh ooit bezocht. Jammer genoeg heeft de decennialange blootstelling aan de weerelementen, geleid tot waterinsijpeling in de opvallende Portland-cementstructuur waardoor vochtschade is ontstaan.

De National Trust for Scotland is nu bezig met het restaureren van het gebouw dat stilistisch wordt beschreven als een mix van „Arts and Crafts, Art Nouveau, Scottish Baronial and Japonisme“.

De Londense architecten Carmody Groarke zijn aan boord gebracht om een ​​weersbestendige envelop te maken om Hill House tijdens deze restauratiewerken te beschermen. Dankzij de verzinkte staalconstructie ontstaat een transparante omhulling en blijft het huis zichtbaar en open tijdens het restauratieproces.

Trappen en gangpaden in de doorzichtige huid zullen bezoekers van dichtbij uitzicht geven op de buitenkant van het huis.

Veel leesgenot!

Bruno Dursin

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Hot Dip Galvanizing – An international journal published jointly by the galvanizing associations of Germany, United Kingdom & Ireland Edited by: I. Johal, H. Glinde (Editor in Chief).

Published by: Galvanizers Association, Wren’s Court, 56 Victoria Road, Sutton Coldfield, West Midlands B72 1SY, UK; Tel: +44 (0) 121 355 8838, E-Mail: ga@hdg.org.uk, Website: www.galvanizing.org.uk This magazine may not be copied without the written permission of the editor © 2020

Photo front cover | Johan Dehlin

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1+3 | T he Hill House Box pro vides much needed protection to Charles Rennie Mackintosh‘s residential masterpiece 2 | Constructed in twenty-five weeks, galvanized steel components were pre-fabricated to reduce the impact of site construction to the historic building

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Protecting

by Iqbal Johal

an architectural icon The Hill House Box, Helensburgh Completed in 1904, The Hill House exemplifies Charles Rennie Mackintosh’s approach to combining traditional Scottish values with modern international ideas. Located in Helensburgh, 40 km northwest of Glasgow, the project was commissioned by publisher Walter Blackie and provides dramatic views over the River Clyde estuary.

The building displays typical Mackintosh influences, with a robust exterior referencing Scottish vernacular architecture, contrasting with a highly ornamental interior, featuring oriental themes alongside art-nouveau and art-deco details. The Hill House has been in the care of the National Trust for Scotland since the 1980s. The trust recently started a major restoration project, which was prompted by the discovery that the building‘s Portland cement render had been compromised by decades of exposure to westerly winds and rain. Conservation was only possible after a successful fundraising campaign.

The Hill House is arguably Mackintosh’s residential masterpiece, one of Scotland‘s most acclaimed buildings, Grade A listed, and a seminal part of early 20th century European architecture. A hybrid of tradition and invention in the construction of the building has led to some fundamental long-term problems of prolonged water damage. Carmody Groarke took on a multi-pronged challenge for the restoration plans: provision to protect the architectural masterpiece from the climate, low impact to its surroundings,

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access for restoration works and possible access for the general public. Rather than incarcerate the house away from view whilst the restoration is undertaken, a more radical approach to active conservation has been taken. As an integral part of the conservation process, which could take up to ten years, a ‘big box’ temporary museum to contain and protect The Hill House as an ‘artefact’ has been built. This allows the house to dry out and be conserved, whilst enabling visitors to see the conservation process first hand and maintain public access to the historic interiors.

The new museum’s architectural identity is that of a huge, abstracted garden pavilion whose walls are covered entirely with a steel chainmail mesh. An extensive galvanized cross-braced steel frame is designed to be grounded with minimum impact on the existing terraced garden. This semi-permanent enclosure provides a ‘drying room’ shelter to the original house, whilst its rain-soaked existing construction is slowly repaired. The chainmail reduces rain penetration while allowing airflow for the building to breathe and dry naturally and sufficient light for trees to grow, bees to pollinate the garden and to naturally day-light the structure. This elegant enclosure also allows uninterrupted views to and from the garden to Mackintosh’s architectural icon. Within this safe shelter, the ‘museum’ provides a remarkable public visitor experience of conservation in progress, achieved by an elevated walkway which loops around and over The Hill House at high level.

Constructed in twenty-five weeks, galvanized building components were pre-fabricated to reduce the impact of site construction to the historic building. Alongside the environmental benefits of saving the house, the architects ensured that materials used could be recycled or reused once the building was removed and conservation complete. The structure has been designed to limit embodied and in-use energy demands for The Hill House and its temporary enclosure.

This £3.2m project aims to enhance the economic, social and cultural value within Helensburgh, in part, by increasing visitor numbers and diversifying those who visit this historic piece of Scottish architecture.

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(Content provided by Carmody Groarke)

HOT DIP GALVANIZING 02 | 2020 4 | An extensive galvanized crossbraced steel frame is designed to be grounded with minimum impact on the existing terraced garden 5 | T he Hill House Box provides a remarkable public visitor experience of conservation in progress, achieved by an elevated walkway which loops around and over The Hill House at high level

Architects | Carmody Groarke Photos | Johan Dehlin

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Subtle

by Iqbal Johal

green intervention Turó de la Peira Sports Centre, Barcelona Turó de la Peira lies on the outskirts of Barcelona, in a dreary part of the city, which is largely unknown to tourists. It is characterised by high-density social housing from the 1960s, with a shortage of public facilities and an unstructured urban landscape of bleak concrete, with no green space.

An architectural competition to rejuvenate the area was won by a proposal that integrated public sports and landscaping into a single structure. Turó de la Peira Sports Centre combines a sports hall and a swimming pool under one roof. The building, designed by architects Anna Noguera and Javier Fernandez, aims to improve the quality of life for residents in conjunction with a local park. The new facility integrates two large spaces; heated swimming pool on the ground floor and sports court on the upper floor. The building is half-buried, adapting to its topography, by bridging the slope between two main streets on opposite ends of the site. The feature green façade minimises the building‘s impact. The project places special emphasis on the perceptions that the space transmits to the user. Natural lighting, vegetation and the use of steel and wood provide a warm comforting atmosphere – rather than the cold anodyne atmosphere of traditional swimming pools.

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1+2 | A green gallery supported by an external galvanized steel frame surrounds the building protecting it from the sun and creates a biocli matic space 3 | An access ramp to the sports court runs between the façade and the green mesh where vines grow 4 | T he building not only provides new leisure facilities but has also created new communal space for local residents

Architects | Anna Noguera + Javier Fernandez Photos | Enric Duch

The first-floor sports court operates throughout the day exclusively with natural light thanks to its four façades and ceiling skylights. In the semi-buried pool, natural lighting is controlled and intimate.

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While the building has a façade made of multi-wall elements three of its elevations have been extended with a galvanized steel frame to create a false wrap around façade. This green gallery surrounds the building creating a bioclimatic space and protects it from the scorching Spanish sun. An access ramp to the sports court runs between the façade and the green mesh where vines grow. It forms an important design component as a natural climate control system for the building.

A large tank located in the basement collects rainwater from the roof for recycling and use for the entire irrigation of the green façade by means of a hydroponic system.

In the garden’s site development, draining strips at the bottom of the slopes collect rainwater to return it to the water table.

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by Holger Glinde

Galvanizing leads the way

Grünental bridge in Monschau, Germany The RurUfer cycle path is a major tourist attraction that starts at the High Fens (Signal de Botrange) in Belgium, follows the River Rur through Germany until it meets the River Meuse in the Netherlands.

The 160 km long three-country path goes through the Eifel National Park and passes through the historic small town of Monschau. In order to ensure the continuity of the cycle path through Monschau, an improvement to the pedestrian foot and cycle path was planned, which entailed using the existing ‘Grünental’ bridge.

During the construction phase of the project, the dilapidated reinforced concrete ‘Grünental’ bridge, was replaced by a hot dip galvanized steel bridge, since an economical repair of the existing bridge was neither possible nor practical.

Hot dip galvanized steel was deemed to be the optimum solution; from sustainable, cost and durability aspects – allowing up to 100 years corrosion protection. In contrast to a possible painted steel option, this saved costs on repair, performance and avoided any unnecessary interference within the conservation area of Eifel.

The new bridge was designed as a single-span structure with a total span of 23.75 m. The superstructure consists of three galvanized steel beams and a 340 mm thick concrete carriageway slab - made of 120 mm thick precast slab, plus 220 mm of in-situ concrete.

Photos | Institut Feuerverzinken

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Each of the steel beams are 25.2 m long, made from two sections - 11.27 m and 13.95 m. These sections were welded after hot dip galvanizing with the weld area being protected by a zinc sprayed coating. A minimum 200 µm hot dip galvanized coating was achieved on the steel beams.

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1 | Grünental bridge forms an integral part of the 160 km long, three-country, RurUfer cycle path 2+3 | T he galvanized steel beams will offer up to 100 years corrosion protection, saving on cost and unnecessary interference within the National Park

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Distinctive

by Holger Glinde

steel cloak Private House, Prague

Located in a leafy suburb, a former holiday home in Prague has gone through a number of conversions, including expansion into a residential house. However, the works had affected the stability of the 1930s building and the hipped roof had become dilapidated over time. The present owners commissioned Šépka Architekti to upgrade and restructure the house.

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Šépka Architekti chose an unusual approach by adding an external galvanized steel frame that cloaks the building. The frame adds a unique aesthetic with some practical advantages. The roof and the upper floor of the existing house were completely removed in order to minimise the load on the existing masonry at ground floor level.

A new upper floor was built with lightweight concrete blockwork, with a circumferential floor-to-ceiling window that provides the floor transparency and brightness. The clever addition of a walkon flat roof provides for a large external space that has been extensively landscaped and can be used as a roof terrace.

The modular hot dip galvanized steel cloak not only serves as part structural element, but also as support for climbing plants and a convenient vertical point of access. Hot dip galvanized steel stairs provide direct access to the roof from the garden and second floor. Internally, the building’s rough concrete finish and wooden furniture create an ambience that complements the natural external aesthetic of the galvanized steel cloak.

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1+3 | T he modular hot dip galvanized steel cloak not only serves as part structural element, but also as support for climbing plants 2 | T he 1930s Prague holiday home with its original hipped roof 4 | Hot dip galvanized steel stairs provide easy access to the roof directly from the garden and second floor level

Architects | Šépka architekti Photos | Aleš Jungmann

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Durable,

by Bruno Dursin

demountable, reusable Leeuwarden Energy Knowledge Centre, Netherlands The Leeuwarden Energy Knowledge Centre was built on a former landfill site in the Netherlands. The building designed

by Achterbosch Architecten relies on a limited palette of materials and is characterised by adjustable foundations due to the inherent ground conditions – building on a landfill site.

The Schenkenschans landfill, which was closed in 1998, was a storage site for construction and demolition waste. In order to prevent emissions via air and water, the site was treated and sealed with foils. Although a difficult site to build on, its reuse potential was taken up

by Achterbosch Architecten. The new building’s floor area of around 800 m² was realised in lightweight construction and elevated off the ground using 108 hot dip galvanized steel supports. The supports stand on small concrete slabs that sit on a layer of sand. Due to expected settling, the steel supports are adjustable while the elevation allows the building to float above the ground, giving it lightness.

For both the architects and the client, the idea of circular construction was an important consideration when planning the building. Aspects such as durability, dismantling and reusability were of central importance from a construction point of view and also in the selection of materials. The decision to use hot dip galvanized steel and certified wood of local origin are examples of this approach. Wherever possible, recycled or used materials were selected. An old gym floor was reused for flooring; recycled PET bottles were used as acoustic materials and reused office furniture was part of the interior fit-out.

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1+2 | T he Leeuwarden Energy Knowledge Centre was built on a former landfill site in the Netherlands 3 | T he new building’s floor area of around 800 m² was realised in lightweight con struction and elevated off the ground using 108 hot dip galvanized steel supports

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4 | W herever possible, recycled or used materials were selected, including the reuse of office furniture 5| T he building can be dismantled; the entire steel structure can be unscrewed and reused 3 Architects | Achterbosch Architecten Photos | Tristan Fopma

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With regard to the practical implementation, says Bart Cilissen, project manager at Achterbosch Architecten: “The main principle was: Use logical thinking and don‘t get stuck in the quagmire of sustainability certificates. The focus was on the right choice of building materials and their application. You could describe it as circularity. As architects, we try to think as circularly as possible for every project. In the design phase, the reuse of building materials must be considered. If the building is dismantled at some point, the entire steel structure can be unscrewed and reused. For me this is the future, as an architect, you will soon have a certain amount of material with which you have to build a building. I almost see a building as a storage place for materials.

When the building has reached its end of life, unscrew everything and you can reuse the materials in their original form.

The less you have to recycle, the better, because recycling uses energy again.“

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Hidden

Photos | Peter Cook (1,3), John Maltby / RIBA Library Photographs Collection (2), Will Scott (4,5)

by Iqbal Johal

strength

Great Arthur House, London John Robertson Architects (JRA) has completed the recladding of Great Arthur House for the City of London Corporation, a Grade II listed landmark, part of the Golden Lane Estate originally designed

by Chamberlin, Powell and Bon and completed in 1956. Influenced by the work of Le Corbusier, the design of the Estate was regarded as a model of social integration with early tenants including doctors, police officers, secretaries, cleaners and caretakers – with an emphasis on one bedroom flats for single people and couples.

Great Arthur House has been restored, taking a 1950s design classic into the 21st century with the replacement curtain wall contributing to the estate wide regeneration. The striking yellow colour is now clearly expressed and provides a welcome counterpoint to the lower blocks of flats and maisonettes at the Golden Lane Estate clad in contrasting primary hues. In addition to replacement of the curtain wall, JRA has restored the pergola and distinctive oversailing curved roof feature, which is cited as one of the first purely decorative motifs to appear on a modern building in London.

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1, 2, 3 | Great Arthur House has been restored, taking a 1950s design classic into the 21st century with the replacement curtain wall contributing to the estate wide regeneration

4+5 | A hidden but decisive role was played by the use of galvanized steel plates that were designed to reinforce each slab edge between apartments

The residents of Great Arthur House were extensively consulted throughout the course of the work and were at the heart of the retrofit project. All works were carried out with residents living in the building.

This was immensely challenging and to make this possible, JRA devised a temporary structural insulated panel that was positioned inside the apartments, while the recladding works took place. The new cladding system comprised storey height prefabricated panels which eliminated the need for external scaffolding.

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The new cladding replicates the delicate extruded profiles of the original 1950s façade, together with the distinctive use of yellow glass. The new façade improves the performance of the original windows with a double glazed and thermally insulated prefabricated panel system.

The new double-glazed curtain wall effectively doubled the weight of the existing cladding system and so strengthening of the existing reinforced concrete slab edges was an important part of the project. A hidden but decisive role was played by the use of galvanized steel plates (6,135 mm x 250 mm x 12 mm) that were designed to reinforce each slab edge between apartments. These plates also had the dual function of providing fixing points for the new curtain wall, which transferred the load of the new façade into the concrete structure, close to the vertical shear walls.

Galvanized steel was selected because of its inherent strength, stability, versatility and longevity. There would be no easy access to the plates so durability was a key component in selecting galvanizing as a protective coating to the steelwork.

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(content provided by John Robertson Architects)

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Galvanizing Delight

For visitors to Franconian Switzerland looking to explore the local area, the Pottensteiner Himmelsleiter should be a must-visit stop. Primarily a radio tower, the Pottensteiner Himmelsleiter is also used as a viewing point - for those who can face its 150 step climb. The hot dip galvanized steel structure is 37 m tall and offers impressive panoramic views of the region.

Photo | Institut Feuerverzinken