HiSCS has been awarded the installation, stressing and grouting works of PT beams of a shipyard’s jetty.
The project deals with the upgrading of a shipyard’s jetty formed by precasted beams, which were found with significant damages over the years. The upgrading design calls for the demolition of the existing beams and the erection of new post-tensioned beams able to meet the requirements of ships docking and pipe rack systems.
The new beams having a length of 36.5m and 1.15m height, will be erected in a neighbouring area inside the shipyard and will be transferred at the jetty using a heavy barge crane.
Each beam consists of 3 tendons with 17-19, seven-wire strands with nominal diameter 15,7mm, in total 8 PT beams, forming a 4-span jetty.
The working sequence starts with the installation of rebar cage/partial shuttering, followed by the PT ducts, bearing plates, grouting accessories, and strands threading. After the placement of complete shuttering, concrete casting is taking place. Upon gain the required by the design strength, stressing follows to implement the stressing forces in the beams. A force of about 75-80% of strands breaking load is usually applied, verified by the elongation of the strands.
The PT work is accomplished with grouting to achieve the bonding of strands. Threading, stressing, and grouting protocols are issued and delivered to the client by HiSCS Technicians and Engineers.
