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2013WinShotcreteEMag

Fig. 3: Fire protected wall substructure of Poland published the results of the international University of Technology team led by Professor architectural competition for the design of the Józef Jasiczak carried out static calculations and building for the MHPJ. tested the load-bearing capacity of structural This prestigious competition attracted famous elements. The creator of the wall structure architects from all over the world, including Daniel design and the detailed working design was Liebeskind, Peter Eisenman, Zwi Hecker, Kengo Wlodzimierz Czajka. Kuma, and David Chipperfield. Finnish architects The envelope of the curvilinear wall is a 2 in. Rainer Mahlamäki and Ilmar Lahdelma, of a Hel- (50 mm) thin-walled, reinforced concrete structure sinki-based architectural studio, won the competi- with mesh reinforcement (ø0.177 in. 4.5 mm tion. In June 2009, a contract was signed between stainless steel ribbed bars). The wall is suspended the owner—the Ministry of Culture and the city of using a system of anchors embedded in a substruc- Warsaw—and the main contractor—Polimex- ture resting on steel columns. The steel columns Mostostal SA. Our company was subcontracted by forming the structure’s framework are located in the main contractor responsible for completion of both walls of the hall and run along the entire the curvilinear wall. building’s height. Vertical elements are made of Originally, the curvilinear walls were planned ø10.75 in. (273 mm) pipes, composed of sections, as resin-cement panels cast ex-situ and then bent in one plane, horizontally braced, and formed incorporated into the steel curvilinear wall into a grid by means of pipe profiles. Horizontal structure with the use of a system of holding elements were made of ø4 in. (100 mm) pipes. The elements. This technology of building a thin-walled, curvilinear dry-mix shotcrete wall is curvilinear wall was burdened with various mounted through a system of rigid anchors to the implementation and economic problems. Knowing pipes serving as the substructure. the possibilities of producing curvilinear The way stresses were distributed at the point of surfaces with shotcrete technology, our company anchorage and dispersed in the wall surface section prepared three curvilinear wall models. At a was an innovative approach. This distribution of meeting with the architect and representatives stress was obtained by mounting a strap with radial of the investor and main contractor, which was bars onto the anchor. The solution allowed avoiding held at TORKRET’s office in September 2010, possible scratching and cracking of the wall at the a presentation of the wall execution method and points of contact with the substructure. For static the prepared models was made. After the visit, calculation model purposes, the wall envelope was a positive opinion was given to the shotcrete considered as multiple point-of-anchorage plates application for building the curvilinear wall. loaded with dead weight. By introducing expansion Static load and fire resistance tests of the joints, dimensions of a single plate were limited to shotcrete model were required. A Poznan approximately 170 to 215 ft2 (16 to 20 m2). Each of Shotcrete • Winter 2013 13


2013WinShotcreteEMag
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