機動建設工業 List of Products and Services

The "Earth Drain Method" is classified as a "pore water pressure dissipation method," which has been widely implemented as a liquefaction countermeasure. This method involves embedding highly permeable drains into the ground using a drain installation machine, thereby enhancing the drainage capacity of the ground and dissipating the excessive pore water pressure generated during an earthquake to suppress liquefaction. 【Features】 - Classified as a pore water pressure dissipation method - Highly permeable drains are embedded in the ground using a drain installation machine - Enhances the drainage capacity of the ground - Dissipates excessive pore water pressure generated during an earthquake to suppress liquefaction *For more details, please refer to the PDF materials or feel free to contact us.

• Special Construction Method

We would like to introduce a construction case of avoiding obstacles using the "arc propulsion" vertical curve, requested from Ishikawa Prefecture. This construction was planned as a river crossing project. To cross the river, the bank sheet piles posed an obstacle, so it was planned with "steep slope start → vertical curve → steep slope reach" to ensure the separation of the pipeline. 【Project Overview】 ■ Project Name: Seismic Reinforcement Project for Prefectural Water Supply Pipeline - Pipeline Burial Work (Kanazawa-1-53) ■ Location: Akatsuchi-cho to Kannon-do-cho, Kanazawa City, Ishikawa Prefecture ■ Method: Ultimate mud-water pressure propulsion method ■ Propulsion Pipe Diameter: Ф1350mm Hume pipe (Main pipe Ф900mm DIP-NS) ■ Propulsion Length: L=259m (Vertical/R550m, R380m Horizontal/R2000m) ■ Cover Depth: 3.9m to 16.8m ■ Soil Conditions: Sandy silt to clay to sandy silt ■ Pipeline Gradient: Start -11.3° Reach +16.8° *For more details, please feel free to contact us.

• Other civil engineering works

We would like to introduce a case study of a large-diameter pipe jacking construction under deep depth and high water pressure, commissioned by the Tokyo Metropolitan Bureau of Sewerage. This project involves the construction of the Nishi-Nippori mainline inflow channel (inner diameter 4,000mm) connecting the existing Nishi-Nippori mainline shaft (inner diameter 12m, depth 35m) and the Nishi-Nippori pump station. 【Project Overview】 ■ Project Name: Construction of Nishi-Nippori Mainline Inflow Channel at Higashi-Ogiku Purification Center ■ Location: 7-2 Higashi-Ogiku, Arakawa-ku, Tokyo (within Higashi-Ogiku Purification Center) ■ Client: Tokyo Metropolitan Bureau of Sewerage ■ Contractor: Wakatsuki Construction Co., Ltd. ■ Method: Earth pressure balance jacking method ■ Pipe Diameter: Ф4000mm (RC pipe type 70N/mm²) ■ Length of Jacking: L = 32.3m ■ Cover Depth: H = 29.8m ■ Soil Type: Sandy gravel (maximum gravel diameter approximately 300mm) ■ Hydrostatic Pressure Head: Approximately 30m ■ Construction Period: April 2012 to January 2013 *For more details, please feel free to contact us.

• Sewerage facilities

We would like to introduce a case study of long-distance and curved thrust construction for a small soil cover, commissioned by Dazaifu City, Fukuoka Prefecture. The project involves the construction of a rainwater drainage system aimed at alleviating flooding damage. Additionally, it features high-precision construction using a real-time measurement system. 【Project Overview】 ■ Project Name: Construction of the Okuzono Rainwater Drainage System, Section 23-1 ■ Location: 1-chome, Gojō, Dazaifu City, Fukuoka Prefecture ■ Client: Dazaifu City ■ Contractor: Kido and Miyahara Joint Construction Enterprise ■ Method: Ultimate Slurry Shield Method ■ Pipe Diameter: Ф1800mm ■ Thrust Length: L=583.7m ■ Curve: R=192m CL=211m at one location ■ Soil Cover: H=1.65m (minimum soil cover) (0.77D) (D=pipe outer diameter) ■ Soil Type: Silty gravel ■ Construction Period: March 2012 to March 2013 *For more details, please feel free to contact us.

• Other earthworks, foundation works, and exterior floors

The "pushing construction method" involves attaching a tunneling machine to the tip of a push pipe (mainly reinforced concrete pipes) and excavating underground while literally pushing the pipe forward with hydraulic jacks from the rear to install it. This method can accommodate a wide range of pipe diameters, from large-diameter to small-diameter pipes, and can handle various soil conditions, from soft ground to gravel and bedrock layers. [Types of Pushing Construction Methods] ■ Large and medium diameter pipe pushing method (open type / closed type) ■ Small diameter pipe pushing method (high load-bearing method / low load-bearing method / steel casing pipe method) ■ Special pushing methods (box culvert pushing method / de-slipping curtain method) *For more details, please download the PDF or feel free to contact us.

• Civil Engineering Method