Construction experience of cast-in-situ diaphragm walls and foundation barrettes for the Thiam Ruam Mit Station, Chaloem Ratchamongkhon line of Metropolitan Rapid Transit Authority (MRTA) is briefly reported in this paper. The construction activities in the midst of heavily congested traffic and in the vicinity of underground utilities to meet the specified quality and safety controls are also presented.


The Chaloem Ratchamongkhon line is the first underground mass rapid transit project in Bangkok, Thailand being constructed under the supervision of Metropolitan Rapid Transit Authority (MRTA). The project involves the construction of about 22km-long, twin bored, single track tunnels, 18 station boxes and cutand- cover tunnels. The project was divided into two separate contracts, South and North. The south contract was awarded to BCKT Joint Venture consisting of Bilfinger + Berger Bauaktiengesellschaft, Ch. Karnchang Public Co., Ltd., Kumagi Gumi Co., Ltd. and Tokyu Construction Co., Ltd. The north contract was awarded to ION Joint Venture, comprising Italian Development Public Co., Ltd., Obayashi Corporation and Nishimatsu Construction Co., Ltd. This paper presents experience on construction of diaphragm walls and foundation barrettes for Thiam Ruam Mit Station (station no. 12) of the North contract where heavy traffic conditions prevail. The station is one of the biggest stations and located on the Ratchadaphisek Road. The station box is enclosed by principally 1.0m thick side walls and 1.20m thick end walls 32.0–42.0m deep. A Tunnel Boring Machine (TBM) launching shaft was included in the north side of the station. To facilitate topdown construction, 63 Barrettes (1.2mx3.0m) embedded 44.5–55.0m deep in conjunction with pre-placed stanchions at the top were used. Three basement levels were planned for the station. As deep excavation required stringent tolerances for the diaphragm walls and barrettes, a high level of quality control was necessary.

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