The project will focus on repairing damage to maintain the appropriate operating capacity according to the actual conditions of the old Cau Lau bridge, including 34 simple T-shaped girder spans made of prestressed reinforced concrete with a total length of 24.7m; total bridge length to the end of the abutment is 841.45m and the bridge width is 9.7m. At the same time, the calculated load for bridge repair ensures a live load of 0.5HL93, a group of people 3kN/m2 (operating load according to the test load test results after completing the repair construction).

Specifically, the construction unit will repair damage, reinforce bridge piers; repair damaged main girders and bridge decks; repair and reinforce horizontal connections; sidewalks and railings; repair bridge decks; relocate and reinstall existing lighting poles; road signaling systems; add surveillance cameras at the northern end of the bridge; and repair other damages such as bridge bearings, bridge deck drainage pipes, damaged expansion joints, etc.

Notably, with the sunken pillar (pillar T8) and 8 pillars located within the deeply eroded riverbed, each pillar was reinforced with 2 additional 1.2 m diameter reinforced concrete bored piles; the pile cap was reinforced with reinforced concrete connected to the existing piles. The beam system on pier T8 was raised, the height of the subsidence compensation stone was repaired and replaced with a steel plate rubber pillow.

For positions of reinforced concrete piles and pier caps with broken concrete, the concrete will be patched with high-strength non-shrink mortar. Damaged steel shells of notched piles and concrete defects inside the piles will have the damaged concrete removed and patched with high-strength cement mortar; the damaged steel shells will be replaced with hot-dip galvanized steel sheets processed in the shape of notched piles.

The project is invested by the Department of Transport of Quang Nam. The main contractor is Quang Nam Transport Construction Joint Stock Company; the construction supervision consultant is Quang Nam Transport Consulting Joint Stock Company. The project will start on September 29, 2024 and is expected to be completed on September 29, 2025.