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TENSINEWS NR. <strong>13</strong> – DECEMBER 2007 10 TWO LOW-COST BARREL VAULTS WITH A MEMBRANE COVER PARKING JUNCAL Background Information: Before, there was an open parking without a roof. A special commission of the city asked for an architectonic proposal, maintaining the use of the parking. Objectives of the roof: - A special design to provide a distinctive design quality and good insertion in the city - Rain and sun protection, so the space can be used as a comfortable parking all year - Allowing entrance of natural light, at least 7%, so the area is not darkened - Eliminating direct solar radiation, to prevent overheating - Easy installation DON JOAQUIN SWIMMING POOL Background information: Initially the swimming pool was only used for summer. The objective was to use it also in winter, taking advantage of the solar energy to heat a small covered part. Description: The covering is made of a PVCcoated polyester membrane, tensioned on a supporting steel structure. The tri-articulated frames in reticulated steel round pipe are made with different radius of Objectives of the roof: - Design with minimum air volume for heating - Allowing entrance of natural light and solar radiation - Rain protection - Easy installation of the membrane curvature. They are placed every 4.62 m and span 20 m. With the generation of high and low points in the perimeter, it was possible to direct and concentrate rainwater to eight points thus avoiding the use of gutters and solving the water drainage by means of small buckets that are then connected to the main drainage system. It is a low-cost solution, of quick assembly. The objectives of the project were fulfilled: obtaining a very pleasant space for parking. Description: The cover is made of translucent PVC-polyester membrane, tightened on the supporting structure. The main structure consists of tri-articulated arches, made of laminated wood. The arches have a span of 12 m and are placed at a distance of 4.5 m. With this solution, the use of a Reasons for choosing a prestressed PVC-coated polyester membrane: It complies with all the objectives, and when compared to other traditional systems such as glass, plastic, metal or concrete construction, these traditional systems do not meet all the Project: Parking Juncal Location: Montevideo, URUGUAY Construction date: June 2003 Covered surface: 800 m 2 Roof design and project: arch. Roberto Santomauro & arch.Patricia Pinto Roof structural engineers: Marella & Pedoja. Roof fabrication and installation: www.sobresaliente.com General project: archs. Anderson & Varela detachable cover was possible on a wooden frame. The wood was a good choice within the natural landscape. Reasons for choosing a prestressed pvc membrane: It complies with all the objectives, specially the fact that the membrane can be removed in summer. Project: Don Joaquin Swimming-Pool Location: San Jose, URUGUAY Construction date: June 2005 Covered surface: 150 m 2 Roof design and project: arch. Roberto Santomauro & arch. Patricia Pinto Roof structural engineers: Marella & Pedoja Roof fabrication and installation: www.sobresaliente.com General project: arch. Miguel Cecilio
equirements. Furthermore, some of them add new problems, such as increasing internal heat and blocking the light completely. Design: The roof shape is obtained by alternating two families of frames, which generate high and low positions. These allow to obtain the curvature in the membrane, and also the pluvial water is drained to a very few well determined points. Prestressing: The tension in the membranes is obtained by a cord, which tensions the canvas to the structure. Building process: After installing and anchoring the structure, the membranes were assembled in two days. Materials: The structure is made of 9 frames of reticulated 2,5” and 2” steel tubes. The membranes are made of threaded polyester PES HT 1100dtex, 5x5 threads per cm (12 threads per inch) with PVC coating, UV protection on the outside, a weight of 800gr/m 2 (230oz/sqyd) and a breaking load limit of 30daN/cm (167lbs/inch). Design: The roof is generated with elliptical arches to obtain the minimum air volume to be heated. Prestressing: The tension in the membranes is obtained by a cord, which tensions the canvas to the structure. Building process: After installing and anchoring the structure, the membranes were assembled in one day. Materials: The structure is made of laminated wood arches. The membranes are made of threaded polyester PES HT 1100dtex, 5x5 threads per cm (12 threads per inch) with transparent PVC coating, a weight of 800gr/m 2 (230oz/sqyd) and a breaking load limit of 30daN/cm (167lbs/inch). Roberto Santomauro, tenso@sobresaliente.com www.sobresaliente.com APPP CHURCH WITH DOUBLE LAYER INSULATED MEMBRANE COVERING Both inside views show the strong impact of the curved lower membrane and the colored façade. For the Andreas-Paulus-Petrus Parish at Maassluis in The Netherlands, architects Mari Baauw and René Olivier of Royal Haskoning made a design for a new church. In the past, different layouts of a church have been developed, each layout having its own effect on the liturgical process in the church. It is restrictive to choose one layout as a basis for the design. Here, the design is based on an innovative functional layout. The architects have chosen to introduce the concept of segmentation: the segments should act horizontally and vertically, wide, deep and high and should be large and small at the same time. Moreover, it should feel comfortable for groups as well as individuals and it should become a space that breathes. These conceptual ideas were transformed into a physical model based on five different shells grouped together, partially overlapping each other. By doing so, the aforementioned segmentation was possible. The daylight enters the building between the overlaps of the different shells. The design by the architects was merely based on the functional requirements of the spaces, meaning that there was no materialization of the design. So the starting point for the structural design was the physical model of the architect. The structural concept of the church consists of five shells that are structurally independent. Each shell consists of three steel arches which are mutually connected by girders. At the top and the bottom side of each shell a membrane is positioned. Onto the lower membrane placeholders are welded in crucifix shape, which hold an insulation layer. At the inside of the church the stamp of the crucifix weld is slightly visible, effectively bringing a smooth appearance to the inner fabric. The lower membranes of the two main shells have a valley cable which creates a strong curvature in the lower fabric, resulting in a strong visual impact at the inside. The outer fabric of the two main shells also has a valley cable but it does not influence the shape of the fabric, leading to a normal saddle shape form. This creates a large space between the outer and inner fabric, giving room to the internal steel structure and even allowing for the use of straight girders instead of curved ones. The outer and inner layers of fabric are mutually connected by a closing slab wrapped around the steel arches. Because this is a doubly curved membrane component, it is also treated as a membrane. To be able to formfind the fabric slab, a contact surface analysis is conducted. As the fabric continues all around the shells, it proved cumbersome to attach the façade, which is placed between the overlap of the different shells, to the supporting steel structure. This was solved by creating holes in the fabric at a certain distance from each other. This enabled a vertical placeholder to go trough the fabric to connect the secondary steel structure of the façade with the main bearing structure. The gap between the secondary steel structure and the fabric is closed by a slab that enables movement of the fabric. Rogier Houtman, Harmen Werkman, office@tentech.nl www.tentech.nl Project name: APPP church, Maassluis (NL) Client: Andreas Paulus Petrus Parish Architect: Mari Baauw, René Olivier of Royal Haskoning Material: outer fabric 1400 m 2 Ferrari Fluotop T2 1202 inner fabric 1000 m 2 Ferrari Fluotop T2 702 opaque Structural Engineer: Royal Haskoning, Rotterdam (NL) Membrane Engineer; Tentech Utrecht (NL) Steel&Concrete contractor: De Klerk Werkendam (NL) Membrane contractor: Buitink Technology, Duiven (NL) Façade Contractor: Rodeca Alphen ad Rijn (NL) Building service Contractor: Stewitech Duurzaam (NL) Front view of church Segmentation of shells also outside clearly visible View inside the space between upper and lower fabric Plan view of church Principle of insulation Isometric view of steel structure Isometric view of steel structure and inner and outer fabric TENSINEWS NR. <strong>13</strong> – DECEMBER 2007 11
Page 1 and 2: N EWSLETTER OF THE E UROPEAN BASED
Page 3 and 4: ON THE DESIGN OF UMBRELLA STRUCTURE
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Page 19 and 20: BÖGNER-BALZ: Who are the students

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