A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
CFRP prestressed high-strength spun concrete masts
The aim of the project presented is the production of a 28 m high CFRP-prestressed spun concrete pylon as a support for electric lines at the 110 kV voltage level (Duralight Pylon). It is intended to use the Duralight Pylon as a support mast in a section of the 110 kV line of the Nordostschweizerische Kraftwerke (NOK Power Companies of North East Switzerland) Beznau-Baden. The fundamental advantage of this new design is the low weight in combination with optimum corrosion resistance (high durability). The high corrosion resistance of the CRFP prestressed reinforcement permits minimisation of the concrete cover so that a cross-sectional wall thickness in the region of only 4 cm, is aimed for. This is present about 10 cm. The low weight of the CFRP reinforcement (the density of CFRP is only 1.6 g/cubic centimetre, which is a fifth of the density of steel) and its high tensile strength (CFRP pretensioning rods have a tensile strength of 3000 MPa, which is twice that of a prestressed steel) are also noteworthy. These two factors permit a weight reduction on the reinforcement side of 90 % compared with conventional prestressed concrete construction. On the matrix side, high-strength spun concrete of strength class B110 is used. Owing to its high strength, this achieves the stated minimisation of the cross-sectional dimensions. The envisaged pylon weight of 4730 kg means a 45 % weight saving compared with the traditional steel reinforced spun concrete pylon. The transport and installation costs are thus lower, the expected life without maintenance being 50 years. The technical fundamentals, studied in a four year research program at the Swiss Federal Laboratories for Materials Testing and Research EMIPA for designing this pylon are described. The presented pilot project results from a close co-operation of the spun concrete element production plant SACAC with EMPA and the power companies NOK.
CFRP prestressed high-strength spun concrete masts
The aim of the project presented is the production of a 28 m high CFRP-prestressed spun concrete pylon as a support for electric lines at the 110 kV voltage level (Duralight Pylon). It is intended to use the Duralight Pylon as a support mast in a section of the 110 kV line of the Nordostschweizerische Kraftwerke (NOK Power Companies of North East Switzerland) Beznau-Baden. The fundamental advantage of this new design is the low weight in combination with optimum corrosion resistance (high durability). The high corrosion resistance of the CRFP prestressed reinforcement permits minimisation of the concrete cover so that a cross-sectional wall thickness in the region of only 4 cm, is aimed for. This is present about 10 cm. The low weight of the CFRP reinforcement (the density of CFRP is only 1.6 g/cubic centimetre, which is a fifth of the density of steel) and its high tensile strength (CFRP pretensioning rods have a tensile strength of 3000 MPa, which is twice that of a prestressed steel) are also noteworthy. These two factors permit a weight reduction on the reinforcement side of 90 % compared with conventional prestressed concrete construction. On the matrix side, high-strength spun concrete of strength class B110 is used. Owing to its high strength, this achieves the stated minimisation of the cross-sectional dimensions. The envisaged pylon weight of 4730 kg means a 45 % weight saving compared with the traditional steel reinforced spun concrete pylon. The transport and installation costs are thus lower, the expected life without maintenance being 50 years. The technical fundamentals, studied in a four year research program at the Swiss Federal Laboratories for Materials Testing and Research EMIPA for designing this pylon are described. The presented pilot project results from a close co-operation of the spun concrete element production plant SACAC with EMPA and the power companies NOK.
CFRP prestressed high-strength spun concrete masts
Masten aus vorgespannten hochfesten Kohlenstoffaserverstärkungen
Terrasi, G.P. (author) / Meier, U. (author) / Burkhardt, B. (author)
Techtextil, Techtextil Symposium, 8 ; 5 ; 1-7
1999
7 Seiten, 5 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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