Pertama Kali Di Indonesia Erection Steel Box Girder 241 Ton Metode Cantilever

Summary

The video highlights the construction of the Keramasan Bridge in Palembang, a vital component of the Kayu Agung-Palembang-Betung toll road. The project utilizes advanced construction methods like the cancel lever technique and rolling Mito to ensure efficiency and environmental minimalism. The bridge spans 71.1 meters and incorporates complex segmental construction, hydraulic jacking, and precise flexion testing. The project also emphasizes safety protocols and rigorous inspections to meet high standards. Overall, the video showcases modern engineering solutions to the challenges of bridge building over rivers in Indonesia.

Takeaways

• 😀 The Keramasan Bridge is part of the Kayu Agung-Palembang-Betung toll road project in Palembang, Indonesia, and spans one of the region's largest rivers.
• 😀 The bridge construction uses advanced techniques like the cancel lever method and rolling mito, which are being applied for the first time in Indonesia.
• 😀 These new techniques eliminate the need for temporary support structures and minimize material waste in the riverbed, improving environmental sustainability.
• 😀 The Keramasan Bridge features a 71.1-meter span and is being built using segmental construction, where large sections are assembled on-site before being lifted into place.
• 😀 Heavy equipment like 130-ton cranes and hydraulic jacks are used to lift and precisely position bridge segments, ensuring accuracy and stability during construction.
• 😀 Multiple inspections are carried out throughout the construction process to ensure that all materials and methods meet safety standards, including a final inspection by independent bodies like Sucofindo.
• 😀 The bolt tightening process for the bridge uses a torque of 680 Newton meters, beginning from the center and working outward to ensure the integrity of the structure.
• 😀 The construction method allows for the bridge's segments to be lowered using 100-ton hydraulic jacks, with checks at every 15 cm to ensure the segments align properly.
• 😀 The construction team employs a carefully planned sequence for placing each bridge segment, with final adjustments being made once the segments are in position.
• 😀 Safety and teamwork are emphasized throughout the project, with the goal of ensuring the workers return home safely upon completion, maintaining a high level of morale despite challenges.

Q & A

What makes Palembang unique in terms of its geography?

Palembang is often referred to as the 'Venice of the East' due to its unique geography, with hundreds of small rivers splitting the city, forming several islands throughout the region.

What is the Keramasan River's role in Palembang's infrastructure?

The Keramasan River is one of the four largest rivers in Palembang, alongside the Musi, Ogan, and Komering rivers, and plays a significant role in local infrastructure, including the construction of the Keramasan Bridge as part of a toll road project.

What is the purpose of the Keramasan Bridge construction project?

The Keramasan Bridge is being built as part of the Kayu Agung, Palembang, Betung toll road project, with a span of 71.1 meters, and it aims to improve connectivity within the region.

Why couldn't conventional methods be used for building the Keramasan Bridge?

Due to the complexity and unique location, conventional methods could not be used for the Keramasan Bridge. Instead, more advanced techniques like the 'canceller lever' and 'rolling Mito' methods were implemented, marking the first time such methods were used in Indonesia.

What are the benefits of using the 'canceller lever' method for bridge construction?

The 'canceller lever' method offers several advantages: it doesn't require temporary supports, it can be used in limited space, and it doesn't require a large launching gantry, making it ideal for challenging locations like rivers.

How was the readiness and safety of the construction equipment checked?

The construction equipment and materials were inspected by the construction safety committee to ensure they met safety standards and were suitable for use in the project.

What is the significance of the tightening of bolts in the bridge construction process?

The bolts were tightened in a two-step process: first at 60% of their final tension, followed by a final tightening to 100%. This ensures the structural integrity of the bridge. The final tensioning was independently verified by Sucofindo for accuracy.

What is the purpose of the deflection and alignment testing on the bridge's segments?

The deflection and alignment tests are crucial for ensuring that the bridge's segments are correctly positioned and structurally sound. Tolerances are strict, with a maximum allowable deflection of 43 cm and a bolt hole tolerance of just 1 mm.

How was the final positioning of the bridge’s girders achieved?

The final positioning of the bridge's girders was achieved using hydraulic jacks with a capacity of 100 tons, and additional equipment like winches and front rollers were used to move and align the girders into their final positions.

What is the process after the girders are in position on the bridge construction project?

Once the girders are in position, additional work is performed, including the installation of elastomeric bearings, checking the chambers, welding, and installing the seal deck. Concrete pouring is done in stages, with the first pour taking place when the concrete reaches 80% of its curing age.