Pneumatic
caisson
technology
Shield tunneling
technology
Port and
harbor technology
Urban rejuvenation
/green technology
Outline of pneumatic caisson
Mud pressurization (DK) shield method
Dolphin dock construction method
Reinforce and Repair by Compound Closingwall (RECC) construction method

Civil Engineering Business: Mud Pressurization (DK) Shield Method

The representative shield construction method aimed at stabilizing the cut face with mud

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Outline of the construction method

With the mud pressurization shield method, the gravel cut using cutters are transformed into mud in order to manage excavation by controlling mud pressure to stabilize the cut face. It is the representative construction method of muddy soil pressure type shield method.

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Characteristics of the construction
method

The stabilization of reliable cut face can be ensured with a wide range of soil quality levels.

By adding the adequate amount of mud control agent at the proper concentration to the sand layer, sand gravel layer, silt clay layer, water sand layer, and alternate layers, they can be converted into mud having plastic flow capability and impermeability, which can be applied to a wide variety of soil properties. Moreover, the high-grade cut face stabilization system allows for measurement of the density, moisture ratio, and amount of removed earth in real time, thereby realizing stabilization of cut faces ensuring its accurecy.

Safe work is ensured even in the case of small overburden zone.

Since cut faces are retained by mud even in the case of work in a small overburden zone not larger than 1D (D: external diameter of shield), safe work is ensured. Safe, secure work is realized even under severe conditions.

It can be applied to high depth/water pressure.

In the excavation experiment in which 0.7 MPa was applied as the maximum water pressure, excavation performance under high water pressure environment has been confirmed, which makes this method applicable to projects at high depth/water pressure where groundwater pressure is applied.also, high water pressure can be handled by using a pump to pump out the soil.

Our Works

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    Work name
    Branch Line Work in Aoto 4/5-chome, Katsushika-ku
    Client
    Katsushika-ku, Tokyo
    Construction period
    S51.6 to S52.3
    Work location
    the Tokyo Metropolitan Government
    Application
    Sewerage
    Outer diameter of the machine (m)
    φ2.44
    Work extension (m)
    160
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    Work name
    Kobe City Subway Kaigan Line Nakanoshima Stop
    and Subway Line (Nakanoshima Section)
    Client
    Kobe City Transporation Bureau
    Construction period
    H7.11 to H12.12
    Work location
    Hyogo Prefecture
    Application
    Subway
    Outer diameter of the machine (m)
    φ5.44
    Work extension (m)
    2484
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    Work name
    Work at Joshin, Joban Expressway T, etc.
    Client
    Japan Railway Construction Public Corporation
    Construction period
    H12.10 to H15.6
    Work location
    Ibaraki Prefecture
    Application
    Railway
    Outer diameter of the machine (m)
    φ7.45
    Work extension (m)
    606
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    Work name
    Section SJ51 to Section SJ53 (Outer Track)
    Tunnel Construction
    Client
    Metropolitan Expressway Company Limited.
    Construction period
    H14.3 to H17.8
    Work location
    the Tokyo Metropolitan Government
    Application
    Road
    Outer diameter of the machine (m)
    φ12.02
    Work extension (m)
    2018
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    Work name
    Taipei Subway Shinsho Line C570H
    Client
    Taipei City, Republic of China
    Construction period
    H15.7 to H24.3
    Work location
    Taipei City
    Application
    Railway
    Outer diameter of the machine (m)
    φ6.24
    Work extension (m)
    2639
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    Work name
    Civil Engineering Work in Route 13 Jingumae Section
    Client
    Tokyo Metro Co., Ltd
    Construction period
    H16.3 to H18.8
    Work location
    the Tokyo Metropolitan Government
    Application
    Railway
    Outer diameter of the machine (m)
    8.66 x 9.96
    Work extension (m)
    739
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    Work name
    Akita Prefecture Omono River Sewage Work
    (Marine Treatment Area)
    Client
    Akita Prefecture
    Construction period
    H17.5 to H21.3
    Work location
    Akita Prefecture
    Application
    Sewerage
    Outer diameter of the machine (m)
    φ2.28
    Work extension (m)
    2091
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    Work name
    Toyokawa Yosui 2nd Term Water Channel Attached to Seibu Kansen
    Work in Togo Section
    Client
    Toyokawa Yosui General Operation Department, Japan Water Agency
    Construction period
    H19.5 to H21.3
    Work location
    Aichi Prefecture
    Application
    Water supply
    Outer diameter of the machine (m)
    φ2.49
    Work extension (m)
    291
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    Work name
    Central Circular Route
    Shield Tunnel-2
    Client
    Bureau of Construction Tokyo Metropolitan Government
    Construction period
    H20.6 to H23.10
    Work location
    the Tokyo Metropolitan Government
    Application
    Road
    Outer diameter of the machine (m)
    φ12.53
    Work extension (m)
    7967
See here for our work
in the Civil Engineering Business
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