initial report

BKK MRTA

1. Project Brief
The traffic congestion in Bangkok, the capital of Thailand, has become more serious due to the increase of vehicles accompanying rapid economic development of the country.
The Bangkok MRTA(Metropolitan Rapid Transit Authority) project is being carried out for the purpose of improving air pollution in Bangkok by providing the capital with an alternative means of transportation instead of just depending on road traffic. It includes constructing a subway of about 23km in length in the central part of Bangkok from Fua Ranpon National Railways Central Station to Ban Su Station. This project is being undertaken by the MRTA, and is funded by a loan from the Japan Bank for International Cooperation (JBIC).
Nishimatsu constructed the northern part of the project extending about 12km (including 9 underground stations) between Thiam Ruam Mit Station and Bang Su Station with the JV of Obayashi and Italian-Thai.
2. High-Speed Construction of Long-distance Tunnel
The MRTA North Contract included the simultaneous construction of a total length of 8.9km twin bored tunnels (inner diameter is 5.7m), beneath the heavy traffic roads in the northern part of Bangkok, and nine (9) underground stations. The tunnel excavation passed through complicated strata consisting of a soft clay layer called Bangkok Clay and a hard clay layer containing portions of a sand layer. Nishimatsu adopted the Earth Pressure Balanced type tunnel boring machine with which Nishimatsu has used successfully in complicated ground conditions around the world, resulting in a high-speed and safe excavation. Nishimatsu used a total of four (4) sets of tunnelling machines, and the longest excavation section for a machine was 4.8km in length. Moreover, as a result of repeating various technical improvements, high-speed construction was achieved, including an excavation length of 600m in only one month.
3. Large-Scale Design-Build Project
This project was a design-build contract by the contractor. Nishimatsu deployed its own design engineers, and partnered with Ove Arup (U.K.) in designing permanent structures such as nine underground stations, a 8.9km length running tunnel, and temporary works such as protection measures for existing structures, utility diversion, etc. In addition to the excellent engineering of a high order, special attention was given to the construction contractor's perspective in the design phase, enabling the large-scale project to be completed economically and in a short time period.
4. Record of Design-Build Projects
Nishimatsu's record of design-build projects is as follows:

Country	Project Name	Main Components of Project	Completion Year	Project Value (converted to Japanese yen)
Malaysia	Centralized Sewerage for kuching City Centre (Package 1)	Sewage Pipe Construction (Dia. 0.225 -1.5m, 52,174m long) and 400,000PE Sewage Treatment Plant	Under Construction	15,200 million
Hong Kong	Hong Kong West Drainage Tunnel	Drainage tunnel (Dia. 6.2 -7.3m, 10,000m long)	Under Construction	35,600 million
Algeria	Algeria East - West Highway East Section	Highawy (396Km long 3 x 2 lane road, including three twin tunnels 9,348m long)	Under Construction	465,500 million
Taiwan	Tseng Wan Reservoir Trans-basin Water Diversion	Watering tunnel (Section 45m2, 13,965m long)	Under Construction	19,300 million
Singapore	MRT Contract 823	Subway (Three underground stations, and 2,300m long twin tunnels)	Under Construction	25,100 million
Singapore	MRT Contract 824	Subway (One underground stations, and 1,428m long twin tunnels)	Under Construction	19,500 million
Laos	Nam Theun 2 Hydro - Electric Project	RC Dam (29m high, 437m long), Inlet tunnel (Inner dia. 10.15m, 1,498m long), Inlet pressured tunnel (Inner dia. 8.2-10.4m, 1,142m long), Outlet tunnel (Inner dia.10.5m, 680m long) and Powerhouse	Under Construction	66,300 million
Thailand	Water Drainage Tunnel from Klong Sansaeb and Klong Ladprao to Chao Phraya River	Drainage Tunnel (Inner dia. 5.0m, 5,116m long)	2009	6,300 million
Ireland	Dublin Port Tunnel	Road Tunnel (Inner dia.14.44m, 7,020m long,) and Approach road (1.2Km long)	2006	42,000 million
Hong Kong	Fanling - Yuen Long Cable Route for China Leight & Power	132KV Power Cable Route construction (17,000m long)	2006	2,500 million
United Kingdom	Channel Tunnel Rail Link, Section 2 Contract 220	Railway tunnel ( Inner dia. 7.15m, 7,547m long twin tunnel)	2005	28,620 million
Hong Kong	Tai Wan - Yau Ma Tei Cable Route for China Leight & Power	400KV Power Cable Route construction (3,880m long)	2003	960 million
Hong Kong	Ap Lei Chau Cable Tunnel for Hongkong Electric	Power Cable Tunnel (Dia 2.1m 410m Long)	2003	840 million
Thailand	Contract No. G-MC-7A, No. 7 Bangkok Water Supply System Improvement	Watering tunnel (Inner dia. 3.8m x 6,700m Length)	2003	1,600 million
Hong Kong	KCRC Tai Lam Tunnel	Railway Tunnel (Section 110m2 x 5,480m Length)	2002	25,100 million
Singapore	LTA Contract 503	Subway Tunnel (Inner dia. 5.4m x 3,500m length x 2lines)	2001	8,700 million
Hong Kong	MTR Contract 680	Subway (Station: 300m long with 1,100m long passenger adit, tunnel:1,500m long)	2001	21,200 million
Singapore	LTA Contract 708	Subway (Station : width 33m x depth 22.5m x 204m length, Tunnel : Inner dia. 5.8m x 3,098m length)	2000	11,700 million
United Kingdom	Dockland Light Railway Lewisham Extension	Railway tunnel (Inner dia. 5.2m x 1,080m length x 2 lines)	2000	8,800 million
Hong Kong	Route 3 Country Park Section	Highway Tunnel (Section 133m2 x 3,700m) and approach roads (6.3km)	1998	96,700 million
Hong Kong	Lamma Power Station Chimney No. 3	Chimney of a thermal power station (height 206.5m)	1996	1,800 million
Malaysia	MSM - Project Marine Facilities Johor Bahru Jetty Construction	Dolphin pier for 30,000DWT oil tankers	1996	1,300 million
Hong Kong	New Airport at Chek Lap Kok, Contract 940 - Rock Crushing Facility	Rock crushing plant erection and operation for Hong Kong New Airport construction projects (14,000t/day, 375,000t/month)	1997	44,000 million
Hong Kong	Lamma Power Station No. 3 Intake	Intake of cooling-water for thermal power station (Intake room : width 39.4m x length 50.4m x depth 15.4m, immersed tubes : 44.5m x 3)	1996	28,000 million
Hong Kong	Western Harbour Crossing	harbour crossing road tunnel (immersed tubes part: 1,362m; cut & cover tunnels part : 210m)	1993	85,300 million
Singapore	Bugis Junction Development	large-scale commercial complex (hotel, offices)	1994	19,200 million
Hong Kong	Tate's Cairn Tunnel	Toll road tunnel (87m2 x 3,900m x 2 lines) and approach road	1991	34,200 million
Singapore	Singapore International Convention and Exhibition Center, Phase 1	foundation works and underground parking facility	1989	16,400 million
Singapore	MRT Contract 301	subway (tunnel : inner dia. 5.3m x 2,586m length, two underground stations)	1989	16,100 million
Palau	Design and Construction of Road and Water System, Ngeremlengui, Palau	roadworks (5.5km, incl. bridge works) and water supply facilities (pump station, water storage tanks, distribution pipeline : 2,480m)	1988	1,100 million
Singapore	MRT Contract 107B	subway (tunnel : inner dia. 5.3m x 820m length, underground station : three floors underground)	1987	7,000 million
Hong Kong	Passenger Jetty Extension and Breakwaters for Lamma Power Station	passenger jetty extension and construction of breakwater	1985	1,000 million
Hong Kong	Coal Jetty Extension for Lamma Power Station	extension of coal handling jetty for thermal power station	1981	7,000 million