Time Efficiency Analysis of Erection Method in Malo Bojonegoro Bridge Construction

Abstract

This study presents a comparative analysis of erection methods in the construction of the Malo Bojonegoro Arch Bridge, a 145-meter steel bridge spanning the Bengawan Solo River without intermediate piers. The project initially experienced delays due to the use of inadequate equipment, prompting the evaluation of alternative erection strategies. This study aims to assess the time efficiency of two approaches: a 250-ton crawler crane operated from land, and a modular pontoon system combined with a 100-ton crawler crane deployed on water. A quantitative method is applied, using empirical field data to compare the total erection duration and calculate the percentage improvement in time performance. The crawler crane method completed the erection in 181 days, while the pontoon-based method took 203 days, resulting in an efficiency improvement of 10.84%. These findings highlight the importance of selecting an erection method that is in line with local site constraints, especially in environments with limited land access and high logistical complexity. This study provides practical insights for bridge construction planning under similarly challenging conditions, emphasizing how method selection affects not only time but also project operational feasibility and risk management.