Overview
- Osaka City said the elevated section of National Route 423 will reopen at 3 p.m., while the Chayamachi exit remains closed.
- About 600 meters of the underpass between Tsurunocho-kita and Doyamacho intersections stays shut pending a post‑nightwork safety review.
- Crews began injecting a cement-mixed solution on March 12 to consolidate soil, and officials said safety was confirmed with expert input.
- The steel pipe had risen to roughly 13 meters above ground and later settled to about 1.6 meters after water was injected on March 11.
- The 3.5‑meter‑diameter, 27‑meter‑long, 56‑ton pipe was part of a rainwater storage project, and officials are probing the cause, noting groundwater removal from March 9–11 may have disrupted ground balance; no injuries were reported.