Photos of the SkyTrain Evergreen Line's massive tunnel boring machine

Comments
1237589_664074106972430_70809644_n

Earlier this month, tunnel construction for the SkyTrain Evergreen Line began and was marked by naming the massive tunnel boring machine.

‘Alice’ is responsible for the 2-km tunnel segment that will travel southwest under Clarke Road, as deep as 60-metres from the surface, from Barnett Highway and View Street to just before Como Lake. From Lougheed to Coquitlam Centre, the new line has a total length of 11-kms and will allow passengers to get from end to end in just 15-minutes – on trains that depart every 3-minutes.

The 9.84-metre diameter, 90-metre long machine has a weight of 1,100 tonnes and will only make one pass to build the one tunnel needed to accommodate both the northbound and southbound tracks. The machine will be operational 24-hours a day, seven days a week by S.E.L.I. Canada, which also undertook the tunnel boring contract for the Canada Line.

The tunnel will be bored at rate of approximately 10-metres a day and is expected to reach daylight in approximately a year.

For more information on the Evergreen Line tunnel boring machine and how it works, click here.

The machines’s drilling head has a diameter of 9.84-metres.

Evergreen Line tunnel boring machine
Image: Evergreen Line

The tunnel construction process begins.
1617126_664121996967641_456131130_o
Image: Evergreen Line

Material dislodged by cutter teeth flows through gaps in the cutter head into a chamber behind the cutter head inside the tunnel boring machine.
1011278_664078153638692_1338613176_n
Image: Evergreen Line

Tunnel boring machine’s cutter head weighs 130 tonnes and had replaceable cutting teeth. The red piqued section in the picture is the centre of the cutter head.
1380216_664077876972053_1337678105_n
Image: Evergreen Line

Inside the tunnel boring machine a ring of hydraulic jacks are used to hold pre-cast tunnel liner rings in place. The jacks are contracted to allow for a new ring segment to be installed and then extended to hold them in place. It also helps push the machine forward.
1899248_666429910070183_1487286123_o
Image: Evergreen Line

A screw conveyor moves the material removed by the cutter head back to the tunnel boring machine’s trailing gear.
1234572_664078603638647_287629706_n
Image: Evergreen Line

The grout is manufactured in a batch plant in the Peller Estates work yard and piped to the tunnel boring machine.
1891181_664077086972132_1161494582_n
Image: Evergreen Line

Grout controls monitor the injection of grout between the TBM liner rings and the earth outside. The grout fills in any gaps between the tunnel and the earth.
1794570_664076820305492_1259929595_n
Image: Evergreen Line

The tunnel boring machine operator can monitor key information like pressure on the cutter head and TBM progress via the TBM’s control console. They can also steer the TBM left, right, up or down but there is no reverse.
1237589_664074106972430_70809644_n
Image: Evergreen Line

1236892_664075103638997_638420701_n
Image: Evergreen Line

The cutter head teeth have sensors that communicate directly with the control room when the teeth need to be replaced.
66443_664079946971846_1530358232_n
Image: Evergreen Line

The first ring segments will be installed against this thrust frame and then removed once the TBM is fully launched into the hillside.
1896765_664079713638536_1523131037_n
Image: Evergreen Line

The ring segment conveyer delivers precast ring segments to the ring inserter inside the tunnel boring machine.
1969223_664079480305226_1179772654_n
Image: Evergreen Line

Precast concrete tunnel liner ring segments.
1146629_664079096971931_248931533_n
Image: Evergreen Line

The tunnel boring machine’s trailing gear has a conveyor belt system that expands as the TBM moves forward. The conveyor belt will transport spoils to the tunnel portal for disposal.
1888674_664070913639416_45272831_n
Image: Evergreen Line

Featured Image: Evergreen Line

Around the Web

About the author

Author Avatar
Vancity Buzz Staff Your inside source for Vancouver happenings. Established 2008.
@VancityBuzz

Facebook Conversations

BACK TO TOP
BACK TO TOP