森環境技術研究所 List of Products and Services

This document is a collection of case studies on the high-water-content soil improvement agent MT series. It introduces projects related to dams and rivers, ponds, ports, pile driving, and ground improvement. Please take a moment to read it. 【Contents】 ■ Bridge pier construction work ■ New tunnel spillway construction work ■ Riverbank improvement work ■ Pond maintenance work ■ Pond renovation work *For more details, please refer to the PDF document or feel free to contact us.

We would like to introduce a case study of the MT series high water content soil improvement agent. This project involves the installation of a sewer pipe. The mud generated from the mud slurry pushing method had a high water content, making it difficult to transport. To address this, we added quicklime to the mud and mixed it appropriately, then added MT-1 and mixed it again, improving its properties to make it transportable within about 15 minutes. Subsequently, it was transported via a standard dump truck through public roads to a temporary storage site located 3 km away. *For more details, please refer to the PDF materials or feel free to contact us.

We would like to introduce a case study of the MT series high cement content soil improvement agent. This project involves the construction of a tunnel in an urban area using the NATM method. The wash water from the ready-mix concrete trucks used on site contained slurry and needed to be regularly transported off-site. However, the site was narrow, and it was difficult to secure a vacuum truck for an extended period. Therefore, MT-2 was adopted due to its characteristics of low additive amount and immediate transport capability. After improving the mud with this product, it was transported to the designated disposal site via a standard 10-ton dump truck, passing through public roads.

We would like to introduce a construction video of the high cement content soil improvement agent MT series. It is a short video of about 1 minute and 30 seconds, so please take a look. This work involves creating improved soil using a self-propelled soil improvement machine. Until now, a challenge has been that high moisture content mud could not be fed into the self-propelled soil improvement machine. Therefore, as a primary treatment, we improved it with MT-2, resulting in a property that can be fed into the self-propelled soil improvement machine. Subsequently, the MT-2 improved soil was further treated with quicklime as a secondary treatment using the self-propelled soil improvement machine. It has also been confirmed that adding MT-2 does not affect the strength development of the improved soil. *For more details, please watch the video or feel free to contact us.

We would like to introduce examples of the construction of the high-cement-content soil improvement agent MT series. This work involves creating improved soil using a self-propelled soil improvement machine. Until now, the challenge has been that high-water-content mud could not be fed into the self-propelled soil improvement machine. Therefore, as a primary treatment, we improved it with MT-2, resulting in a property that could be fed into the self-propelled soil improvement machine. Subsequently, the MT-2 improved soil was further treated with quicklime as a secondary treatment using the self-propelled soil improvement machine. It was also confirmed that adding MT-2 did not affect the strength development of the improved soil. *For more details, please refer to the PDF materials or feel free to contact us.

We would like to introduce a case study of the high water content soil improvement agent MT series. This project involves the restoration of a gas pipe buried underground. When we excavated the shaft, groundwater emerged at depths of 10 to 30 meters, causing mud and muddy water to hinder the construction. Additionally, the temporary storage yard was narrow, requiring immediate removal of the mud. As a solution, MT-1 was adopted, and this product was added to the mud mixed with quality soil for improvement. The improved soil was promptly transported to an improvement plant located about 15 kilometers away. The main objective of this project was the restoration of the gas pipe, and there were concerns about the time and cost involved in removing the mud. The high water content soil improvement agent MT series provides reliable support for unexpected mud situations. *For more details, please refer to the PDF document or feel free to contact us.*

This construction project involves the removal of sediment accumulated in the retention basin. The site is located near residential areas, and due to the limited construction space, it was difficult to use cement or lime for improvement. Therefore, a high-water-content soil improvement agent, MT-1, was adopted, and after improvement with this product, the material was immediately transported by dump truck to a nearby temporary storage area. *For more details, please refer to the PDF document or feel free to contact us.*

This construction project is a land readjustment project aimed at the large-scale consolidation of rice paddies. In this project, the initial plan was to backfill the existing waterway with locally generated soil for agricultural use. However, due to the high moisture content of the locally generated soil, we considered methods for soil improvement, but using cement or lime was not feasible due to concerns about their impact on crops. Therefore, we conducted trial mixtures to see if the high-water-content clay soil improvement agent MT-2 could be used. As a result, all soil environmental standard component analysis items were below the standard values, and the soil hardness (Yamanaka method) was determined to be 12mm after 21 days, leading us to conclude that backfilling with improved soil was possible, and we proceeded with mixing at the site of the existing waterway. Furthermore, considering future subsurface drainage and agricultural practices, the use of improved soil was limited to a depth of 80cm below the surface. Subsequently, improved soil was also utilized in adjacent construction projects. *For more details, please refer to the PDF document or feel free to contact us.*

This construction project involves dredging the sediment from a reservoir. At the same site, the accumulation of sediment in the reservoir had reduced its water storage capacity, causing issues. However, the high moisture content of the sediment made it difficult to transport using dump trucks. Therefore, a high moisture content sediment improvement agent, MT-2, which is neutral and allows for immediate transport from the site, was adopted. The original sediment was improved with this product, and after primary transportation within the site using a crawler dump truck, the treated soil was transported to a temporary storage area several kilometers away using dump trucks. *For more details, please refer to the PDF document or feel free to contact us.*

This construction project involves the construction of a drainage pumping station. During the pile driving using the Nakabori pile method, high-water-content clay soil was generated, so we were considering a simple treatment method. Additionally, consideration for the surrounding environment was an important issue at this site. Therefore, a neutral and dust-proof treated high-water-content clay soil modifier, MT-2, was adopted. After improving the soil with this product, it was immediately transported to a temporary storage area by dump truck. The sand-mixed silt layer had a water content ratio of 50%. With the addition of 3 kg/m3 of MT-2 and approximately 10 minutes of mixing, it became possible to transport it immediately. *For more details, please refer to the PDF document or feel free to contact us.

This construction project involves the removal of treated water sludge that has been discharged onto the solar drying bed at the water purification plant. At the same purification plant, due to heavy rain, the turbidity of the dam that serves as the water source increased, leading to a rise in the amount of treated water sludge discharged onto the solar drying bed, which posed a risk of the treatment cycle falling behind. Therefore, to urgently remove the treated water sludge from the solar drying bed, a high-water-content mud modifier, MT-1, was adopted, and after being modified with this product, it was immediately transported to a temporary storage area on-site. *For more details, please refer to the PDF document or feel free to contact us.*

We would like to introduce examples of the MT series high-water-content soil stabilizer. During pile driving work, mud containing groundwater is generated during excavation, which has been a hindrance to construction. Therefore, the high-water-content soil stabilizer MT-1, which can be improved with a low additive amount and instantly, and is also safe for the environment, was adopted. After improving the sludge with this product, repeated re-excavation and mud removal with an auger were carried out, enabling rapid pile driving operations. It is currently being used at similar sites nationwide. *For more details, please refer to the PDF document or feel free to contact us.

We would like to introduce a case where our high water content soil stabilizer MT series was used to treat residual soil from piles. The soil generated from excavation using the all-casing method had a high water content, necessitating some form of improvement. Additionally, after the improvement, it was desired that the soil be transported to a nearby disposal site for repurposing as agricultural land. Therefore, the high water content soil stabilizer MT-2, which takes safety and environmental considerations into account, was adopted. After improving the excavated soil with this product, it was immediately transported to the disposal site by dump truck. 【Case Overview】 <Challenges> - The soil generated from excavation using the all-casing method had a high water content, requiring some form of improvement. - After improvement, it was desired that the soil be transported to a nearby disposal site for repurposing as agricultural land. <Result> - After improving the excavated soil with "MT-2", it was immediately transported to the disposal site. *For more details, please refer to the PDF document or feel free to contact us.

This construction project involves dredging sediment accumulated in the river to secure the riverbed. The site has a very narrow work yard, and there was no space to temporarily store and air-dry the dredged sediment. Initially, lime-based materials were considered, but concerns arose regarding securing storage space and the potential for dust dispersion to nearby areas. As a result, a high-water-content soil stabilizer, MT-2, was adopted, and after improving the dredged sediment with this product, it was immediately transported to a sediment disposal site located about 10 km away. *For more details, please refer to the PDF document or feel free to contact us.*

At the waste incineration plant, the wet ash, which is produced after burning paper and grass and then soaked in water, has a light mass and becomes slurry-like, making it difficult to transport on a belt conveyor. Therefore, the high-water-content mud soil improvement agent MT-2 was adopted. By improving the slurry with this product and granulating it, transportation on the belt conveyor became possible, enabling immediate transfer from the container to the final disposal site. Since its initial adoption, it has been continuously used. 【Project Overview】 ■ Construction Period: December 2019～ ■ Application: Transportation of wet ash on a belt conveyor ■ Adopted Product: High-water-content mud soil improvement agent MT-2 ■ Issue: Unable to transport light mass wet ash on a belt conveyor *For more details, please refer to the PDF document or feel free to contact us.

This construction project involves the construction of a high-rise condominium in an urban area. During excavation to create underground levels, a large amount of high-water-content clay soil containing a lot of groundwater was generated, and its treatment became a challenge. Additionally, there were issues with the dispersion of lime used in the process and the difficulty of long-term chartering of vacuum trucks. As a solution, the high-water-content clay soil improvement agent MT-1, which has a low additive amount and is environmentally friendly, was adopted. After improving the soil with this product, it was immediately transported to a waste disposal site. 【Project Overview】 ■ Construction Period: December 2019 ■ Location: Miyagi Prefecture ■ Adopted Product: High-water-content clay soil improvement agent MT-1 ■ Challenge: Treatment of the large amount of high-water-content clay soil generated during excavation ■ After Improvement: Immediate transport to the waste disposal site *For more details, please refer to the PDF document or feel free to contact us.