A section of the northbound lanes on National Highway 1 in Taichung remains closed for emergency repairs following a localized road surface subsidence. The issue was identified during ongoing construction for the second phase of the Municipal Road Extension project, which involves complex underground pipe-jacking work beneath the highway.
According to Taichung City Construction Bureau Director Chen Da-tian, the subsidence occurred on May 23, affecting an area measuring approximately 15 centimeters by 20 centimeters. The site was identified as being impacted by local geological conditions during the pipe-jacking process, which is described as a large-scale and technically challenging underground operation.
Did You Know? The Municipal Road Extension project’s second phase, spanning from Huanzhong Road to Anhe Road, utilizes a pipe-jacking method that is considered rare for large-scale underground construction in the country.
Construction crews initiated emergency traffic maintenance procedures and closed the inner northbound lane starting at 1:00 p.m. While physical repairs to the road surface were completed by 9:00 p.m., authorities determined that an extended curing period was necessary to ensure the structural stability of the grouting work. The highway authority and city officials decided to delay the reopening of the lane until between 4:00 and 5:00 a.m. The following morning.
Expert Insight: The decision to prioritize road stability over immediate reopening reflects a cautious approach to infrastructure safety. By choosing to extend the curing time and incorporate ground-penetrating radar scans, officials are likely aiming to mitigate long-term risks associated with subsurface voids, particularly given the high traffic volume characteristic of this national thoroughfare.
In the wake of this incident, the city is coordinating with the Freeway Bureau to implement ongoing monitoring and reporting protocols. Future construction phases will feature high-frequency automatic monitoring to ensure the continued safety of both the highway and nearby high-speed rail infrastructure. Drivers are advised to exercise caution and remain alert for potential traffic congestion in the affected area.
Frequently Asked Questions
Why was the reopening of the highway lane delayed?
Although physical repairs were finished by 9:00 p.m., authorities required an additional curing period for the road grouting to ensure the surface remains stable under heavy highway traffic.
What caused the road to sink?
The subsidence was attributed to local geological conditions encountered during the complex pipe-jacking process required for the Municipal Road Extension project.
How will authorities ensure safety moving forward?
The city plans to use ground-penetrating radar to detect any potential voids in the surrounding area and will maintain a high-frequency automatic monitoring system throughout the duration of the underground construction project.
Are you concerned about the impact of large-scale infrastructure projects on existing transportation routes in your area?
