Milling Mall Construction Method Case Study: Ise Bay Crossing Gas Pipeline Installation Project
Immediately after departure, excavate the stone masonry wire cage and tetrapod section of about 20 meters!
The construction site for the Ise Bay Crossing Gas Pipeline installation encountered the discovery of old stone masonry (large boulders) in addition to results from prior magnetic surveys indicating some metal reactions, leading to the adoption of the milling mole method. During the excavation of the launch shaft, the stone masonry and tetrapods that were unearthed were significantly larger than the nominal diameter of φ1000mm, making cutting very difficult. The thrust pipes also utilized composite steel pipes with rolling prevention features specifically designed for milling. During construction, fragments of large boulders and wire were discovered, and it is believed that the metal reaction was due to this wire, which was likely associated with the large boulders contained in a wire cage. 【Construction Case】 ■ Project Name: Ise Bay Crossing Gas Pipeline Installation (Gas Conduit Construction) ■ Client: Toho Gas Co., Ltd. ■ Contractor: Kajima Corporation ■ Pipe Diameter: 1000 ■ Thrust Length: 68.47m ■ Soil Type: Riprap, Sandy Soil ■ N Value/Gravel Ratio/Maximum Gravel Diameter: N=50 G=80% φmax=1000mm ■ Construction Period: 2011.12.11 to 2012.2.8 (2 months) ■ Type of Obstacle: Wire, Tetrapod Old Stone Masonry (Large Boulders) *For more details, please refer to the PDF materials or feel free to contact us.
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basic information
【Milling Mall Method 4 Special Functions】 ◎ Exploration: Exploring metal obstacles ahead while advancing the excavation ◎ Improvement: Ground improvement from inside the tunneling machine before and after the obstacles ◎ Cutting: Crushing and discharging metal obstacles ◎ Guidance: Guiding the tunneling machine to the designated position of the standing pile *For more details, please refer to the PDF document or feel free to contact us.
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For more details, please refer to the PDF document or feel free to contact us.
Detailed information
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Old revetment stone masonry (large boulders) excavated during the launch shaft excavation Large boulder dimensions (1300mm × 900mm × 900mm)
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Company information
Yasuda Engineering Co., Ltd. has been a specialized company in public sewer construction, contributing to the environmental development of the local community since its establishment in 1975. We have pursued sound management and advanced technical capabilities, continuing to make steady progress. In 2001, we acquired the international standard "ISO9001" and expanded into the field of general civil engineering. We aim to be a corporate group capable of continuous innovation as a comprehensive construction company, including building construction. "Honing our technology with rich sensibility, we evaluate from a fair perspective to enhance the vitality of the company in order to meet our customers' needs." This is the management policy of Yasuda Engineering Co., Ltd. We, Yasuda Engineering Co., Ltd., are committed to uniting all employees to refine our technical skills and create a new future.