06-16-2022, 10:02 AM
Slipform System
The slipform is a form continuously moving at such a speed that the concrete, when exposed, has already achieved enough strength to withstand the pressure from the concrete above which is still in the form. It will also withstand lateral pressure due to wind wall inclination and the hike
Six main trusses carried the entire load of the slipform assembly. These trusses were connected to each other by two central ring girders whose centre coincided with the centre of the chimney shell. The outer support of the trusses were the yokes on which a pair of 6 t capacity jacks were located. Four radial spider beams were located between the two main trusses. The outer support of these beams were the yokes on which a pair of 3.5 t capacity jacks rested . Therefore, in all, there were forty eight 3.50 T jacks and twelve 6 T jacks which took the load of the entire assembly. These jacks were connected to a centrally located hydraulic pump unit by means of high pressure rubber hoses. On operating the pump unit the slipform arrangement climbed 25mm per stroke upwards. However, the individual jacks were equipped with an arrangement so that the throw of the jack could be varied by ± 10rnm. The 3m long jack rods passed through these jacks and took the entire load. These jacks rods were suitably extended by stud connection as the slipform moved upwards, and were placed within the annular void, left in the concrete, by a 1m long mild steel sleeve which travels along with the slipform arrangement. The void around the jack rod, created by the sleeve, facilitated its easy extraction and retrieval. The sleeve also helped to stiffen the jack rods to a certain extent. Seven such extraction operations were performed during the slipform.
For more detail download ....
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REACHING FOR THE SKY FD.pdf
The slipform is a form continuously moving at such a speed that the concrete, when exposed, has already achieved enough strength to withstand the pressure from the concrete above which is still in the form. It will also withstand lateral pressure due to wind wall inclination and the hike
Six main trusses carried the entire load of the slipform assembly. These trusses were connected to each other by two central ring girders whose centre coincided with the centre of the chimney shell. The outer support of the trusses were the yokes on which a pair of 6 t capacity jacks were located. Four radial spider beams were located between the two main trusses. The outer support of these beams were the yokes on which a pair of 3.5 t capacity jacks rested . Therefore, in all, there were forty eight 3.50 T jacks and twelve 6 T jacks which took the load of the entire assembly. These jacks were connected to a centrally located hydraulic pump unit by means of high pressure rubber hoses. On operating the pump unit the slipform arrangement climbed 25mm per stroke upwards. However, the individual jacks were equipped with an arrangement so that the throw of the jack could be varied by ± 10rnm. The 3m long jack rods passed through these jacks and took the entire load. These jacks rods were suitably extended by stud connection as the slipform moved upwards, and were placed within the annular void, left in the concrete, by a 1m long mild steel sleeve which travels along with the slipform arrangement. The void around the jack rod, created by the sleeve, facilitated its easy extraction and retrieval. The sleeve also helped to stiffen the jack rods to a certain extent. Seven such extraction operations were performed during the slipform.
For more detail download ....
REACHING FOR THE SKY FD.pdf