Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II

Abstract

The problem that occurs in the Balang II Island Bridge construction project, East Kalimantan Province is the blockage of concrete flowing through the tremi pipe when casting the borepile foundation at sea. A considerable distance from the initial location to the end point of the casting requires a fairly long tremi pipe. This blockage causes the concrete to flow imperfectly. There are many speculations about the cause of this problem, including leaks in the tremi pipe and the uniformity of the concrete mix. To prevent the failure of the foundation structure, a non-destructive pile integrity test (NDT) will be carried out. Integrity
test method in the form of Crosshole Sonic Logging Test (CSL). The results of the CSL test on pylon P1 show that from the 17 borepile piles tested, there is 1 pile that has an abnormality, namely the P1-64 pile with the P/D category on the entire cross section. Overall the borepile tested showed good results, where the carrying capacity of each pile was able to carry the existing load with a sufficient safety factor. Repair of defective concrete parts can use coring and grouting methods.