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TBM launched for Thailand’s largest underground tunnel project

bangkok’s metropolitan electricity authority

Bangkok’s Metropolitan Electricity Authority (MEA) has launched the TBM for Thailand’s largest underground tunnel project - a cable tunnel in Bangkok.

The 1.8km cable tunnel will run through downtown Bangkok and will navigate tight alignment constraints including the foundations of the Chit Lom BTS Skytrain Station.

Geological conditions consist of stiff to very stiff clay with lenses of sand and a groundwater head of about 2 bars.

When completed the tunnel will be an extension of the existing underground power line that connects the power supply between the Bang Kapi station and the Chidlom station.

bangkok metropolitan electricity authority 1

bangkok metropolitan electricity authority 1

The 3.6m diameter tunnel will be 40m deep, and bored using a tight radius TBM for the challenging tunnel alignment.

TBM manufacturer Terratec celebrated the successful Factory Acceptance Test of a new 4.27m diameter earth pressure balance tunnel boring machine (EPBM) back in May.

The total construction cost is 878M baht (£20.6M) with a construction period of just under three years.

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