Saturday, February 02, 2013

Extracting the Central Subway tunnel boring machines

Save Muni sends along this notice on the Central Subway:
Feel free to attend to hear about the latest plans and to make comments. Everyone is working together to avoid disruption to North Beach’s businesses and neighbors. But many questions remain, especially after a fire alarm cut off questions at the 1-22-13 Community Meeting. Many folks asked for technical studies of other TBM extraction methods.

MTA BOARD: Director’s Report on Pagoda Theater/Extraction of TBMs
TUESDAY, FEBRUARY 5, 2013, 3 PM (near beginning of meeting).
At City Hall, Room 400

PLANNING COMMISSION: Pagoda Theater Special Use District
THURSDAY, FEBRUARY 7, 2013, (12 PM Start) Item 10a, 12:30 PM+ at City Hall, Room 400

Because the 1-22-13 Community Meeting ended with the fire alarm, we should ask for another community meeting to answer community questions.
1. Why not stop TBMs at Chinatown per the Central Subway’s original design plans? Economically, it is illogical to spend $80-100 million for the northern tunnel extension to North Beach and the Pagoda Theater to get only $4-6 million in TBM salvage value. At the 1-22-13 Community Meeting, Director Ed Reiskin promised that the North Beach tunnel would be used ONLY for TBM extraction, not for years of delivery/storage of materials to Chinatown’s construction. The northern tunnel has no function other than for TBM extraction, an unnecessary expense.
2. How are cutter heads and supporting structures removed? There have been changing explanations about extraction processes and why North Beach is required for extraction.
3. Why not bury TBMs, like Brisbane, the Chunnel and in New York? The extra cost for the Pagoda site and for the 2,000 foot tunnel from Chinatown are unnecessary expenses that can offset extra  contractor’s expenses.

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At 5:02 PM, Blogger Rob Anderson said...

Mari sends in this comment:

"We need more information on this deal. Why is the city so intent on spending so much money to get the tunnel into North Beach?

Who stands to gain from San Francisco's loss?"

Who owns the land that will be designated as a transit corridor and have their height limits raised as a result?"

At 5:08 AM, Blogger Raquel Gomez said...

Boring machines cut the inside of a bore to enlarge its diameter. Boring machines are developed to make a bore in the shortest time and produce the highest possible surface finish and tolerances. Thanks for sharing.

Himes Machinery


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