“Harriet” has reached Martin Luther King Jr. Station Box
Harriet, the tunnel boring machine (TBM), arrived at the Martin Luther King Jr. station site on Aug. 22. Since then, the Walsh/Shea Corridor Constructors (WSCC) crews has been busy disassembling Harriet and transporting the machine piece by piece to to the south wall of the station. Once reassembled, Harriet will begin excavating the last leg of the southbound tunnel. Harriet is expected to break through Leimert Park Station box in October.
The tunnel boring machine (TBM) is 400 feet long and has a diameter of 21.5 feet. A crew of 75 workers man the machine on a 24/7 basis.
Crenshaw/Expo and Martin Luther King Jr. stations
The two underground stations continue to take shape. WSCC keeps working on the lower walls — installing conduit and waterproof membrane — and the columns that will support the mezzanine areas. The Crenshaw/Expo station box is about 80 percent complete and the Martin Luther King Jr. station box is 20 percent complete.
Leimert Park Station
Waterproofing and the subfloor is expected to be completed by the first week of October. The plumbing, electrical, fire protection, rebar are expected to be done by mid-September, among other things.
UG4 (Portal exit/entrance to the tunnel, between Vernon Avenue and 48th Street)
Excavation is now 75 percent and work continues on the exit portal from the underground segment to the at-grade level segment on Crenshaw Boulevaard. Removal of the Tesoro pipeline is expected to be completed by the first week of September.
Park Mesa Heights (street level segment between 48th and 59th Street)
Civil work and storm drain construction is taking place in Park Mesa Heights between 54th and 48th streets. Demolition and replacement of curb, gutters and sidewalks is ongoing.
New street lights and traffic signals will be installed. Crenshaw Boulevard will also be re-surfaced with a targeted completion date of July 2017. On the frontage road, work to relocate fire hydrants and water meters is taking place this month and next.
The replacement of storm drains at 48th street and manhole covers on 52nd Street continues. The storm drains under 50th Street and Westmount Avenue are finished. The majority of the work is expected to be complete by December.
UG3 (underground segment from 60th to 67th streets)
Installation of steel piles has been completed in this segment. By December all intersections from 60th to 67th streets will be totally decked with concrete panels.
Excavation is 60 percent complete in the north (59Th street/Crenshaw Boulevard). The south (67th/ Crenshaw Boulevard) is 67 percent complete.
Fairview Heights and Downtown Inglewood stations
Construction of the Fairview Heights and Downtown Inglewood stations is now 50 percent complete. Walls and subfloor are also complete. WSCC will pour concrete for the platform deck around mid-September.
WSCC continues to do grading work on the street-level segment between Fairview Heights Station and Downtown Inglewood Station. The foundation for the overhead catenary pole system in this segment is completed as well as the segment between Aviation/Century and Arbor Vitae and between Manchester to Westchester/Veterans.
The north and south mechanically stabilized earth (MSE) walls have been completed. Railing and more ductbank work is ongoing.
WSCC will begin construction of the falsework (framing) over the I-405 Freeway. This operation will last from September to the second week of December,. In the meantime construction crews are working on the MSE walls on both sides of the freeway.
Construction of the Overhead Catenary System (OCS) foundation continues from Manchester Avenue to Aviation/Century Station with other work continuing in the area.
The superstructure for the bridge for the aerial station over Century Boulevard is done. WSCC is now installing the falsework for the station. The MSE walls on the south and north side of the station have been completed. Drilling work for the elevator casing is ongoing.
111th Street Bridge
The bridge and MSE walls are complete. WSCC is relocating a water line from the Los Angeles World Airport (LAWA). This bridge will allow motor vehicle traffic to enter and exit the cargo area of the airport.
Green Line Connection
Work continues on the bridge superstructure. The north segment is now 75 percent done and the west side is 50 percent completed. WSCC is installing reinforced steel rebar and will later pour concrete.
Southwest Yard Maintenance Facility
The company Hensel Phelps/Herzog Joint Venture began construction of the 115,650-square-foot facility in May. All demolition and clearing of the site was completed in June. Site excavation continues for the main shop.
Preparation is being made to begin work on relocating underground utilities (sewer, electrical, plumbing and water lines). All approvals and permits were obtained for the restriping of Arbor Vitae. The traffic transfer from Bellanca Avenue to a temporary access road is planned for early September. Concrete work for the main shop building is expected to begin in October.