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| Efficient construction of two sedimentation tanks  The municipal sewage treatment plant in the old ducal city in the French Alps will be expanded. The contract was awarded to Eiffage TP Rhone Alpes branch (Lyon). Initial construction work started in 2010; it is envisaged that the plant will start operation in the course of 2013. Beneath the buildings to be constructed will also be the sedimentation tanks with a 9.96 metres internal diameter and a height of over 13 meters. It was decided to use the TTS, a completely smooth steel circular formwork, which constructs the fair faced concrete surfaces in series. Four segments of 3.00 metres height each and an extension element of a height of 1.50 metres were used, meaning that in total a formwork height of 13.50 metres was achieved. The class S3 concrete was inserted with the concrete pump.The multifunctional MULTIP working platform, which was already installed to the formwork during the assembly of the circular formwork, was used, in accordance with the French safety regulations. All work was completed within the set schedule with great success and very smoothly. The adjustable radii Trapezoidal Girder circular formwork (TTS) was specifically used by the awarding authority for the construction of biogas plants. The TTS has a 5 mm thick steel facing. The formwork is thereby solid, absolutely round and accurate to size and will maintain its exact radius even after being reused several times. The circumference can be formed to the centimetre and without any job-built fillers. The square metre forming surface will take up to 80 kN of concrete pressure. It's exactly these advantages that are used in mainly sophisticated technical buildings but also in high-quality architecture and that were used to form these circular tanks. Due to the fast relocating processes, the particularly small number of openings for ties, the stability and/or stiffness of the formwork, all work progressed smoothly, securely and within the shortest time possible and therefore in the best possible way and efficiently. The low number of openings for ties also increased the quality of the concrete surface. write your comments about the article :: © 2012 Construction News :: home page |