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This document introduces the MLT method and construction examples from MLT Soil Co., Ltd., a specialized contractor for foundation work. It includes numerous construction examples involving hard ground and cobblestones, such as the "Kyukankashira Rendaiji BL and other projects," the "Hokuriku Shinkansen Omi Elevated Bridge Project," and the "Hokuriku Shinkansen Mineyama Tunnel (East) Project." 【Construction Examples】 ■ Kyukankashira Rendaiji BL and other projects ■ Hokuriku Shinkansen Omi Elevated Bridge Project ■ Hokuriku Shinkansen Mineyama Tunnel (East) Project ■ Yamamoto Coast Embankment Reinforcement Project ■ Nao Ohashi Detour Temporary Bridge Installation Project *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method

The "MLT Method (No-Debris Hole Wall Method)" is a hard ground excavation method that compresses excavated soil against the hole wall using a special screw consisting of a compression wing and a mixing wing, without generating industrial waste. The special screw with a compression wing pushes the excavated soil into the hole wall, reducing the void volume ratio and allowing the hole wall to stand independently. Therefore, it is possible to reduce the amount of excavated residual soil. As the hole wall is compressed, the friction on the screw decreases, allowing most of the force to be applied to the tip bit, which efficiently cuts through bedrock and hard boulders. Additionally, the self-supporting hole wall reduces the rotational reaction force on the screw, making the base machine only 40% of that of conventional machines, which makes it suitable for narrow spaces. 【Features】 ■ Achieves cost reduction and shorter construction periods compared to conventional methods ■ Demonstrates power in drilling cobbles and boulders ■ Reduces excavated residual soil ■ Increases construction speed ■ Efficiently cuts through bedrock and hard boulders ■ Suitable for narrow spaces *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method

This is an introduction to construction examples of "MLT method," including "foundation piles and ground improvement." In the construction of PHC piles within the Chubu Electric Power substation, the method was applied because there were high-voltage lines overhead, making it impossible to use tall machinery. Additionally, it was adopted for ground improvement (columnar improvement) in the Hokuriku Shinkansen Mineyama Tunnel (East) construction. The method was applied due to the narrow work yard, which made it impossible to bring in large machinery, and the fact that the anchoring area was mudstone. 【Construction Example 1】 ■ Client: Chubu Electric Power Co., Inc. ■ Project Name: Foundation Construction for the Monitoring Tower at Chubu Electric Power Northern Substation ■ Details: Construction of PHC piles within the substation ■ Conditions: High-voltage lines overhead made it impossible to use tall machinery *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

This is an introduction to construction examples in narrow sites with obstacles such as narrow land and overhead lines using the "MLT method." In the widening project of National Route 402, the work became impossible due to the difficult operation of a small crane in a narrow construction yard, leading to a change to the "MLT method." Despite the highly unstable cliff strata, perfect hole walls were maintained, and the construction was completed smoothly. Additionally, it was adopted for the foundation work of the observation tower at the Chubu Electric Power Northern Substation. 【Construction Example 1】 ■ Client: Niigata Prefecture Maki Civil Engineering Office ■ Project Name: Disaster Prevention Work on National Route 402 ■ Details: Narrow construction yard, unstable cliff strata ■ Result: Perfect hole walls were maintained, and construction was completed smoothly. *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

This is an introduction to construction examples that achieved "vibration-free and low-noise" work adjacent to residential areas through the "MLT method." In the case of the retaining work associated with the construction of the Hokuriku Shinkansen, this method was adopted due to the construction conditions that required no noise or vibration as it was adjacent to residential buildings. Additionally, in the retaining work related to the construction of the Kyushu Shinkansen, this method was also adopted because it was adjacent to apartments and houses, where noise and vibration could not be generated. 【Construction Example 1】 ■ Client: Railway Construction, Transport Facility Development Support Organization ■ Project Name: Hokuriku Shinkansen Kanayama T and other works ■ Details: Retaining work associated with the construction of the Hokuriku Shinkansen ■ Conditions: Hard pebbles and boulders are densely scattered, making conventional methods difficult; adjacent to residential areas with no noise or vibration allowed. *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

This is an introduction to a construction example of "steel sheet pile pre-excavation" using the "MLT method." "Steel sheet pile pre-excavation" is an auxiliary work for driving steel sheet piles into hard ground. In the construction of driving revetment sheet piles within the fishing port at the mouth of the Agano River, there were old paving stones (granite) at GL-2m, and boulders up to 700mm were cut into core shapes and removed using the MLT machine. Additionally, it was also adopted in the disaster recovery work for the Igarashi River by the Sanjo Regional Promotion Bureau of Niigata Prefecture. 【Construction Example 1】 ■ Client: Hokuriku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism ■ Project Name: Matsuhama Special Embankment Disaster Recovery and Other Works ■ Details: Driving revetment sheet piles within the fishing port at the mouth of the Agano River *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

This is an introduction to a construction example of "landslide prevention pile work" using the "MLT method." In recent years, with sudden heavy rains and typhoons causing rainfall far exceeding expectations, measures against landslides and debris flows have become urgent. "Landslide prevention pile work" involves driving steel pipe piles to suppress landslides. A landslide occurred in the Katanoe area of Sado City, spanning 100 meters in width and 200 meters in height, where 71 prevention piles were installed in two tiers. Additionally, this method was adopted in the emergency landslide work related to disasters in the Nogema area by the Nagaoka Regional Promotion Bureau of Niigata Prefecture. It can be utilized in many locations, so please contact us first. 【Construction Example 1】 ■ Client: Niigata Prefecture Sado Regional Promotion Bureau ■ Project Name: Katanoe Landslide Disaster Prevention Work ■ Conditions: Installation of 71 prevention piles in two tiers, shortened construction period *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

This is an introduction to a construction example of the "Mountain Retaining Parent Pile Work" using the "MLT Method." The "Mountain Retaining Parent Pile Work" involves driving temporary parent piles into a hard ground, and the construction of the Jugo No. 1 irrigation canal was carried out by the Hokuriku Regional Agricultural Administration Bureau of the Ministry of Agriculture, Forestry and Fisheries. Additionally, it has been adopted for the construction of the Hokuriku Shinkansen by the Railway Construction and Transport Facility Development Support Organization. 【Construction Example 1】 ■ Client: Hokuriku Regional Agricultural Administration Bureau, Kuzuryu River Agricultural Water Resource Office ■ Project Name: Jugo No. 1 Irrigation Canal Construction No. 1 ■ Conditions: A gravel layer with numerous cobbles of 300mm or more scattered throughout A geological condition where the effectiveness of the MLT method is maximized *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

We are introducing the construction achievements of MLT Soil Co., Ltd., which specializes in foundation work. Starting with the "Nuo Ohashi Bypass Temporary Bridge Installation Project" conducted in 2009, we have numerous achievements including the "Yamamoto Coast Embankment Reinforcement Project" and the "Uta Overpass Project," which were completed by 2016. Additionally, you can view the number of achievements related to the "MLT Method" up to January 2017. 【Construction Achievements】 ■ 2016: Higashi Tobiyama Nadachi Line Hiratani Widening Bypass Temporary Bridge Installation Project ■ 2016: Uta Overpass Project ■ 2015: Certain Thermal Power Plant Project ■ 2015: National Route 283 Kamaishi Road Project ■ 2014: Shinano Embankment Protection Work No. 1, among others *For more details, please visit our website or feel free to contact us.

• Ground foundation construction method

The MLT method (no-excavation hole wall method) is a technique that involves pre-drilling and replacing the ground to drive steel sheet piles or H-piles into hard ground. By compressing the excavated soil against the hole wall using a special screw made of a compression wing and a mixing wing, the self-support of the hole wall is achieved, allowing for rapid drilling. As a result, the amount of soil discharged during drilling is also reduced. This method is particularly effective for hard ground, including gravel, cobbles, and bedrock, achieving cost reduction and shorter construction periods compared to conventional methods. Additionally, we have established a research group for the no-excavation hole wall method to further develop and promote this technology. 【Features】 ■ High construction accuracy ■ Reduction of excavated soil ■ Low noise, low vibration, and no dust ■ Cost reduction and shorter construction period ■ Usable in narrow spaces ■ Reduced risk of collapse *For more details, please download the PDF or feel free to contact us.

• Ground foundation construction method

The "Low-Head MLT Method" is a low-head version of the "MLT Method," which efficiently excavates hard ground by compressing the excavated soil against the borehole wall using a special screw consisting of a compression wing and a mixing wing. *Are you facing challenges in locations where the ground is high and there are restrictions above? - Under bridges - Inside substations and power plants - Inside factory buildings By improving the conventional hard ground pre-boring method (MLT method) drilling machine, we have developed a pile driver for hard ground with a height of 4 meters without reducing the excavation power. This machine is designed to handle construction in sites with headroom restrictions and narrow spaces. 【Features】 ■ 4-meter high pile driver for hard ground ■ Suitable for construction in sites with headroom restrictions and narrow spaces ■ Compresses excavated soil against the borehole wall using a special screw consisting of a compression wing and a mixing wing ■ Vibration-free and low noise *For more details, please refer to the PDF document or feel free to contact us.

• Bentonite

In the "MLT Method Construction History Document," we present a list of our construction achievements. We have successfully addressed numerous challenging sites that are difficult to work with using conventional methods through the "MLT Method." 【Construction Achievements (Excerpt)】 ■ 2009: Installation of Temporary Bridge for Nōu Ohashi Detour - Client: Ministry of Land, Infrastructure, Transport and Tourism, Hokuriku Regional Development Bureau, Takada River National Route Office - Type of Work: Pier Pile - Geological Layer: Gravel mixed with cobbles - Initial Design: Down-the-Hole Hammer ■ 2009: Sendai City High-Speed Railway East-West Line, Nishi Koen Section - Client: Sendai City Transportation Bureau - Type of Work: Retaining Pile - Geological Layer: Gravel mixed with cobbles, soft rock - Initial Design: Earth Auger ■ 2010: Reinforcement Work for Yamamoto Coast Embankment - Client: Ministry of Land, Infrastructure, Transport and Tourism, Tohoku Regional Development Bureau, Sendai River National Route Office - Type of Work: Steel Sheet Pile Pre-Boring - Geological Layer: Riprap, Concrete Blocks - Contracted Method: MLT Method *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method

The self-propelled full rotation excavator "Excel Method" demonstrates the unique mobility of self-propelled machines. Additionally, compared to the currently mainstream stationary excavators, it has a casing rotation speed that is about 1.5 times faster and a casing lift stroke that is three times greater, allowing for faster excavation and the ability to easily cut through hard boulders and rocks. There is no need to lift the machine body, eliminating the requirement for large cranes.

• Ground foundation construction method