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Brief of diving:
- A The Los Angeles wastewater tunnel was partially collapsed On July 9, in a section “where the ground exerted a high pressure on the area”, according to a letter from Robert Ferrante, chief engineer and general director of the Los Angeles county sanitation districts.
- No one has still been able to enter the tunnel or evaluate the location of the breach, said the spokesman for the Los Angeles County Sanitation Districts, Michael Chee, said in an email on July 28 and the boring machine of the tunnel remains in his place where he quit mining. “Work on the tunnel stays at a stop,” said Chee. “The red tag placed by Calosha is still in effect.”
- The theme of pressure first appeared in February, according to a letter of July 17, “with the” demand “of the segment rings that create an ovalization of these rings and a little cracking.” At that time, a tunnel lintel engineer reviewed the problem and GC FlatIRON/Dragados, based on Brofield, adopted suggested measures to mitigate it.
Divide vision:
Research on the breach of the Los Angeles effluent tunnel continues. The tunnel boring machine had advanced 4,100 feet away from this initial purchase area when partial breach was 370 feet under the ground, according to the letter. Flatiron/Dragados is currently working on an access plan for the tunnel and more answers will be available once the crews can re -enter.
Twenty-seven Workers escaped without greater injuries From the Carson tunnel, California, climbing on a large assembly of loose and emerging soil to the only entry 5 kilometers away, reported New York Times. Other four who came in to help with rescue efforts also emerged. The tunnel is designed to carry treaties, non -waste water, and partial collapse is not a risk to the environment, the agency said.
The $ 630 million tunnel, which was broken in 2019, is part of the sanitation districts ” Clearwater project To protect local navigable roads, according to the project’s website. The new 7 -mile tunnel will transport the wastewater treated in the ocean and replace two aging tubes. It will be built according to the current standards of earthquakes and with sufficient capacity to protect the overflows of important storms.
The tunnel alignment is mainly within public law and not houses, and “there is no information that suggests that no local streets or surfaces above the tunnel construction have been committed,” according to the letter. However, polls teams will supervise the area daily.
“We are committed to prioritizing the safety of workers and we will follow any and all the corrective measures necessary to complete the construction of this project of life infrastructure once all the security concerns They have been thoroughly addressed, “says the letter.
An article from 2022 Mining Engineering magazine stated that the The tunnel route goes through two areas of active faults – The area of Fallas de Palos Verdes and the Falla Cabrillo area – and numerous geotechnical challenges could be found on its way.
The project is built by Flatiron West and Dragados USA, which works as a joint company. The two parent companies merged last July to form Flatirondragados.
The work was expected to be completed by 2027, but it is not yet clear how much the project will be delayed, according to the letter. Construction preparation work on the location of the tunnel boring machine in Royal Palms Beach, in San Pedro, is still planned, according to Chee.
According to the project website.
