Continous columns are basically a column which spans from floor to floor which surpasses each floor which comprises a corbel at each floor level to support the surrounding which is rested on beams. Spandrel beams are usually placed between the continuous columns on each floor. Columns can be produced in lengths of up to 24m. However, the length of 15m is the most economic length Continuous and convenient for handling. The speed of installation is the primary advantage in using continuous columns. These type of columns are connected at each floor level and are more often the internal columns on each story located inside the boundary of the building. The columns are connected by spine beams which are typically placed over these columns and connected by high strength dowel bars with grouted dowel tubes cast into the beams and columns. The spine beams are usually continuous which rests on several columns and connecting them to form a network frame. These beams most often cantilever at the last column on the periphery to facilitate a beam drop. Structures can be erected one floor at a time with beams placed at the head of a column at one level before the upper-level columns are erected and connected through the beams to the columns below with this type of precast construction method.
The structures which consist of a single story column at the edge are very common. These structures have continuous edge beams connected to the columns with high tension steel dowels which are them grouted into dowel tubes and then cast into both columns and beams. Usually, multi-story precast buildings involve a combination of column, beam and cross-wall construction where each element has its own benefits which are utilized to improve structural and cost efficiencies. Some common cross wall elements like the lift shafts and gable walls are also used in conjunction with column & beam structures, which adds notable structural stability to the structure
- Requires less on-site duration for erection.
- An instant working platform for the project is ready to sustain the load when the unit is installed in its final location in the project.
- Various architectural finishes like carpet can be accurately formed in the controlled factory manufacturing conditions.
- The extraordinary standard of finish to all concrete surfaces can be maintained.
- Greater stiffness and fire resistance is available with the use of concrete for stairs in comparison to steel finishes. Architectural finishes can easily be incorporated