Slip Formwork
Slip Formwork Systems are generally used in high buildings that have a high number of reinforced concrete wall sections. This system allows the high buildings to be built in a short time and it is used where continuous concrete pouring is required. The Slip Formwork is a system in which the formworks are continuously raised by hydraulic equipment. The Slip Formwork System can be applied to constructions of various forms; prismatic, cylindrical, conical, hyperbolic, paraboloid such as towers, chimneys, silos, viaduct piers etc.
The Slip Formwork System is installed only one time and the system is not disassembled until concrete work is completed. The advantage of the system is its ability to provide impermeability due to the absence of shear connection openings. Additionally, during concrete casting work, cold joints are not formed because the concrete pouring is carried out continuously. The elevation speed of the Slip Formwork is approximately 3-4 m/day. The Slip Formwork System can be moved horizontally and vertically. In the projects that involve constructions of cylindrical or cubic shaped structures, the Slip Formwork System is only moved vertically; and for conical, and prismatic structures the slip formwork System is moved horizontally and vertically. Horizontal movement is achieved by some project specific adjustments in the Formwork Systems.
The Slip Formwork moves together with the carcass structure it is connected to. The movement is provided by the climbing type hydraulic jackscrew. The jackscrews are lifted on the climbing bars,
designed to allow the jackscrews to be added onto each other in order to reach desired height. The climbing bars carry the load without causing deformation of the opening that is left in concrete by the guide pipe. This method, in addition to providing continuous and fast application, also removes any necessity of an additional cage. This method is based on a suspended system double that has a limited formwork height, and rigid construction, is smaller in size and double walled. The speed of the elevation process is 10-30 cm/hour. There is an escalation of about 2,5 cm within each elevation. The construction speed can be increased up to 3.0- 4.0 meters a day.