Crane accident investigator Tom Barth said on Monday, according to a video of the collapse of the Seattle crane, \"If the pin is inside, the crane will not collapse.
\"On Saturday afternoon, when the worker took the crane apart, the mast of the crane collapsed.
These sections are located at the top of Google\'s new building, where it was used, and the traffic below is also crowded, with six cars being hit.
Two steel workers on the crane were killed, a retired city employee and two people from a college freshman in the car were also killed.
Four others were injured.
\"The reason for the tower\'s collapse was the steel workers, and the staff did not follow the manufacturer\'s instructions to remove the crane,\" Barth said . \".
Barth, who has been a tower crane operator, inspector and accident investigator for 38 years, said that the only safe way to remove the tower crane is to disassemble it in sections.
First, fix a line on the other crane to the top of the removed part.
Only in this way, the worker will remove the bolts that fix the part to the bolts below.
The second crane lowered the part, Barth said.
These videos, including one of the dashboard cameras on a car close to the crane\'s fall, seem to show the clean separation of the various parts of the tower crane, indicating that the pin may have been removed early, dave Kwass, a trial lawyer handling a crane accident lawsuit, said.
\"As an investigator, where will I start to get a better understanding of what these two unfortunate steel workers might do when they remove the pins,\" Kwass said . \".
\"What I see is a crane that looks like the pin is popped all the way to the base section.
\"Kwass also suggests the moving weight at the top of the mast when the worker tries to catch the wind --
Swinging hooks and lines on other cranes may help push the mast over.
In Dallas, 2012, a tower crane mast collapsed during disassembly, killing two workers.
Seattle-based tower crane expert Terry McGettigan declined to comment on Saturday\'s accident, but he wrote a paper about the collapse of Dallas, warning that there is a risk of a shortcut to loosening or removing bolts ahead of time.
The Steel Workers Union, based in Portland, Oregon, and 86 local workers in Seattle, representing workers who died on Monday, did not respond to requests for comment.
Tim Church, spokesman for the Department of Labor and Industry in Washington, said inspectors completed their work on site on Monday.
He said it was too early to guess one reason.
On Monday, the ministry expanded its investigation to include the fifth company: Seaburg construction.
Tower crane operator is used.
Other companies are general contractor Gurley of Northwest Tower Crane Service Co. , Ltd.
Omega rigging and mechanical moving company
And Morro equipment
Company and its subsidiaries
Contractors involved in the tower crane accident are doing everything we can to investigate the matter, \"the company said in a written statement.
\"We are fully cooperating with investigators and assisting local authorities.
We did not have further details in the early stages of the investigation.
\"The dead steelworkers were identified by the Union as Andrew Joode, 31, in Washington, and Travis Colbe, 33, Oregon.
Colbert\'s wife Samantha Colbert told Seattle television that her husband had served in the United States. S.
The Marine Corps had been here for five years before becoming a steel worker.
They got married last year and planned their honeymoon in June.
Sarah Wong, a 19-year-old freshman at Seattle Pacific University, and Alan Justad, 71, were also killed. They retired in 2014 as deputy director of planning and development in Seattle.
Mayor Jenny Durkan said in a written statement that Justad was a real civil servant.
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