{"data":{"news":{"items":[{"title":"Terratec completes flood mitigation tunnel project in northern Thailand","date":"2025-12-02 00:02:28","id":6105,"author":"","blurb":"","blurb_image_uid":"https://dxfpracgmlczp.cloudfront.net/2025/12/1764600595135_S48D-2025-AP-01-rcfj5dp73wmihuuc8ab7ksnybdjfah4z06oz6xh5rk.jpeg","blurb_expanded_image_uid":null,"article":"\n\t\n\n\n

Terratec has completed tunnelling works for the Chiang Mai Flood Mitigation Project (Phase 2) in northern Thailand. Commissioned by the Department of Public Works and Town & Country Planning, the project was finalised in early 2025, marking the delivery of a key underground infrastructure system for the region.

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This achievement is particularly significant as tunnelling projects of this scale are less common outside Bangkok, said Terratec. The works centred on the construction of a 2.60-m-diameter, 256-m-long drainage tunnel, designed to integrate with Chiang Mai’s existing stormwater network.

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In addition to the tunnel drive, the scope included launching and reception shafts, steel pipe connections, HDPE pipeline installation, hydraulic structures and surface drainage channels.

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The tunnel was excavated using a Terratec tunnel boring machine (TBM), with reinforced concrete universal tunnel segments forming the lining. Each ring was engineered for both straight and curved alignments, ensuring durability and precision throughout the drive. Rigorous settlement monitoring confirmed ground stability during operations.

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The project was delivered by Summit Grade Ltd, Part. (Sam Prasit) in joint effort with SCG 1995 Co Ltd, acting as subcontractor. Both companies worked under the supervision of Panya Consultant Co Ltd, with Terratec providing technical expertise and equipment support.

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In December 2023, Terratec celebrated the successful factory acceptance test of a new 6.39-m-diameter earth pressure balance tunnel boring machine (EPB TBM) which will be deployed for the construction of the Bangkok Metro Purple Line (C3) in Thailand.

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The event was attended by representatives from the Mass Rapid Transit Authority of Thailand and contractor ITD-NWR MRT Joint Venture. The second factory acceptance test for another EPB TBM is scheduled to take place in April 2024.

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The Bangkok Metro Purple Line, spanning a length of 23.63 km and serving the northwestern area of Bangkok from Tao Poon to Khlong Bang Phai in Nonthaburi province, is the fifth rapid transit line in the city. Its southern extension, which comprises a 14.3 km underground section and a 9.3 km elevated section, commenced construction in August 2022 and includes a total of 17 stations.

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The two Terratec EPB TBMs will be utilised to construct a total tunnel length of 3.12 km, connecting Phan Fa Station to Memorial Bridge Station across two metro stations.

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The project encounters several challenges, said Terratec, particularly in navigating the TBMs through the historic area of the old Bangkok capital, which includes landmarks like the Grand Palace and old temple. Another significant aspect is the interchange station at Sam Yod, connecting the Purple Line with the existing Blue Line MRT.

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The Purple Line will ingeniously pass beneath the operational Blue Line tunnels. Additionally, the TBMs will undergo an impressive feat by driving under the Chao Phraya River for a stretch of 150 m. The construction process necessitates meticulous planning and management to ensure minimal disruptions to the surrounding infrastructure and environment.

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According to Terratec, the geological conditions along the tunnel alignments will encompass soft clay, stiff clay, dense clayey and silty sand. To accommodate these conditions, the TBM’s soft ground cutterhead is equipped with a flat spoke type with copy cutters.

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During the construction process, traditionally reinforced, 275 mm thick by 1,400 m wide, Universal reinforced concrete segments (5 + 1) will be installed as the machine progresses. Muck removal, segment transport, and the supply of consumables will be facilitated by rail-bound equipment using battery locomotives.

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Terratec TBMs feature the Enzan laser guidance system, which allows for remote access to the complete tunnelling system, thus ensuring accurate control over the TBM operations. With this Enzan system, precise navigation of the tunnels is guaranteed to improve the efficiency and effectiveness of tunnelling projects.

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Terratec celebrated the successful site acceptance testing of two 6.52-m-diameter earth pressure balance tunnel boring machines (EPBMs) for Uttar Pradesh Metro Rail Corporation (UPMRC) for the Corridor-1 of Kanpur MRTS Project (KNPCC-05) in India.

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The two Terratec EPBMs have started excavating for the first underground tunnelling package (KNPCC-05) of the 32.4-km Kanpur Metro Phase 1 project’s 8.6-km underground section by contractor Gulermak-Sam India JV.

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Kanpur Metro has two corridors: IIT Kanpur to Naubasta Corridor and Agriculture University to Barra-8 Corridor. The TBMs for the package of the 23.8-km Orange Line-1 connecting IIT Kanpur to Naubasta has a length of 3,619 m and comprises four stations. This includes an elevated section of 15.16 km and an underground stretch of 8.62 km.
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\nAwarded to Gulermak-Sam India JV in September 2020, the contract also includes the construction of the four new underground stations at Chunniganj, Naveen Market, Bada Chauraha and Nayaganj each 215 m long.

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For the geology consisting of soil, clay, silt and sandy silt, both EPBMs are equipped with a spoke-type cutterhead with 57% opening ratios, which had been proven to be very efficient excavating this type of soil.

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These EPBMs have now been launched for the initial drives from Bada Chauraha station to Naya Ganj station. Expected challenges are typical for tunnelling in a densely populated, yet historical urban area.
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\nMachine operation is assisted at all times by Terratec’s field service staff, providing after-sales support to ensure optimum performance and successful project completion. Tunnelling operation is carefully observed throughout the manoeuvre via a settlement monitoring programme.

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Kanpur Metro is an urban mass rapid transit system (MRTS) being developed to meet the long-term traffic demand of the city of Kanpur in Uttar Pradesh. Anticipated to be completed in 2024, the 32-km-long metro rail system will reduce traffic and pollution, shorten journey times and open up new career and educational opportunities in Kanpur.

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The new metro will also contribute to making the city safer and more business-friendly. The project will benefit climate change mitigation, by promoting a change from road to rail while reducing gas emissions, as well as expediting social and economic infrastructure & urban development.

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A Terratec EPBM (earth pressure balance tunnel boring machine) has recently completed the Rama III cable tunnel project in downtown Bangkok, Thailand. This 4.27-m-diameter EPBM successfully broke through in early April 2022.

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The EPBM owned by contractor Italian-Thai Development PCL (ITD) had previously completed the Chidlom cable tunnel (CCT). After completing the CCT, the contractor immediately deployed the machine to the Rama III tunnel project.

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The Rama III is a high-voltage cable tunnel, part of a series of tunnelling projects being undertaken by Bangkok’s Metropolitan Electricity Authority (MEA) to meet the increased power demands in the Thai capital.

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According to Terratec, the Rama III project is subject to several constraining factors, including tight alignment constraints as well as navigating the foundations of the overhead bridges along the alignment. This could only be achieved with the X-type articulation system incorporated into the design, which can accommodate the very tight radius curves required by the project of approximately 85 m.

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The Terratec 4.27-m-diameter’s soft ground cutterhead features an open spoke design to ensure good material flow and the addition of knife bits to assist break-in and break-out of the concrete shaft eyes.

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Two types of segments were installed: universal tapered precast concrete segments, 1,200 mm long (installed as the machine normally progresses); and shorter steel segments, 600 mm long (utilised during the course of the sharp radius curves).

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Terratec further explained that tunnelling operations were closely observed throughout the project via a settlement monitoring programme that demonstrated minimal impact on the existing above-ground structures.

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Geological conditions along the 3.5-km Rama III tunnel alignment consist of stiff to very stiff clay with lenses of sand and a groundwater head of about 2 bars.

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The project is located close to the Chao Phraya River with heavy traffic and the physical limitations of this built-up area – which includes numerous high-rise buildings and the foundation of the overhead bridge.

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With such a confined location, logistics during the launch and operation of the TBM have been “extremely challenging” especially during the transportation and delivery of oversize TBM parts for assembly on site, said Terratec. The company’s field service staff have therefore been working closely with ITD from day one in order to ensure every aspect is planned in advance.

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