HONOLULU (KHON2) — Independent analyses are underway on the cracks in the concrete columns that support the elevated stations along the Honolulu rail line. Reports are expected by the end of this month.
“The trial runs need to be done successfully and the hammerhead cracks need to be addressed appropriately before we can transfer it over to DTS and open,” said Lori Kahikina, Executive Director and Chief Executive Officer of the Honolulu Authority for Rapid Transportation.
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Kahikina provided the latest update in a Zoom discussion organized by AARP Hawaii on Thursday. “Hammerheads” refer to the concrete structures that extend from the central column to support the station platform girders. The columns come up and jet out in a T-shape, hence the name.
She said cracks were first noticed in December 2018, however, KHON2’s report of damage to parts of the guideway on Kualakai Parkway in Kapolei go back to 2015.
“We notified our Engineer of Record, and in January of 2020, they said, ‘Don’t worry, it’s shrinkage cracks. It’s just hairline,'” said Kahikina. “You know, when you pour a concrete dry, there’s always cracks. Nothing to worry about, they said.”
However, wider and longer cracks were observed this past summer, prompting more inspections to be conducted by four groups of structural engineers, including the EOR. Kahikina noted that this observation happened just as they were ready to start handing the system over.
“The Engineer of Record is the one that is responsible to make sure that everything is per their design, all the calculations, analysis, that can support those stations. By the end of September, they are slated to come back to us with some remedial fixes to the cracks,” said Kahikina.
She hopes it’s something as simple as just epoxy coating the cracks so that additional water doesn’t get into them. However, it could be more substantial, something major structurally that they have to do. And if that’s the case, and it goes longer?
“So if Hitachi is done with all the trial running tests, they meet their 98.5% in the first quarter of next year, the hammerhead cracks are not solved, we are not opening,” said Kahikina. “We are not transferring to DTS until this is settled.”
TIMELINE
- December 2018 — Cracks first observed
- January 2020 — The EOR concluded cracks due to shrinkage and structures are sound
- June 2022 — Wider cracks observed
- June/July 2022 — Inspections are done by four groups of structural engineers, including EOR
- September 2022 — Independent analyses underway, with reports expected by end of month
- The EOR will determine what repairs are required, then those determinations will be independently validated
This timeline was provided by Kahikina in AARP Hawaii’s forum.
In the meantime, trial runs will continue between Kualakai in East Kapolei and the Halawa station at Aloha Stadium. This is the final series before the rail system can be put into operation.
To watch the full AARP Hawaii discussion, click here.