強化土エンジニヤリング List of Products and Services

The "Durable Inorganic Solution Type Silica Sol Grout Series" [NETIS Number: KT-200081-A] is a durable inorganic solution type silica sol grout based on silica sol obtained by removing alkalis, which are factors for the degradation of water glass grout, with acid. It provides permeability and durability based on an acidic silica sol with a long gelation time, and by suppressing the leaching of silica, it excels in quality (durability) and cost-effectiveness. Furthermore, by adding in-situ gelation permeation methods (Magma Action Method) and masking silica methods, it enables extensive permeation solidification effects, solidification effects below the groundwater level, and safety for buried objects in the soil. Additionally, by integrating on-site soil mixing design methods, silica analysis ground silicification evaluation methods, accelerated testing methods, and specimen preparation equipment and testing methods, durable ground improvement using injection materials has become possible. Moreover, the pH of the injected ground is neutral, and since it is composed entirely of inorganic materials, it has high water quality preservation and excellent safety for aquatic organisms.

• Ground improvement
• Ground foundation construction method
• Ground improvement materials

The "Hybrid Silica Series" is a groundbreaking suspension-type permanent grout developed as a result of long-term durability research on liquid injection conducted through industry-academia collaboration since 1981, excelling in strength and durability. Over 30 years of permanent performance verification studies and large-scale field injection tests combined with injection methods have been conducted to demonstrate permeability and long-term solidification properties, and the results were recognized, receiving the Technical Development Award from the Japanese Geotechnical Society in 2002 for "Permanent Grout and Injection Technology" (Yonekura, Shimada). This brought a qualitative shift to the field of liquid injection methods, which had primarily focused on temporary construction, expanding its application to permanent construction purposes. Long-term durability verification tests have continued, and in 2018, the long-term solidification properties were confirmed after 19 years following large-scale field tests. 【Feature 1】 - It is an ultra-fine particle composite silica grout, classified as an inorganic suspension-type grout. - A wide range of gel times can be set, from rapid-setting formulations to warm-setting formulations. - The gel maintains strength over the long term and has minimal volume change, making it excellent in long-term durability. - Hybrid silica consists of ultra-fine suspended silica with an average particle size of 3.5 μm and solution-type silica, making it suitable for permeation injection into sand layers. - Seawater can be used as mixing water. (See Feature 2)

• Ground improvement
• Ground improvement materials
• Airport facilities

The "Permalock ASF Series" is a permanent grout solution based on active silica developed from long-term durability research on liquid injection conducted in collaboration with industry and academia since 1981. It is used for liquefaction prevention and permanent ground improvement. [NETIS Number: KT-190051-A] Over 30 years of durability verification studies and large-scale field injection tests combined with injection methods have been conducted to demonstrate its permeation solidification and aging solidification properties. The results were recognized, and in the fiscal year 2002, it received the Technical Development Award from the Geotechnical Society for "Permanent Grout and Injection Technology" (Yonekura, Shimada). This brought a qualitative shift to the field of liquid injection methods, which had primarily focused on temporary construction, expanding its application to permanent construction purposes. Long-term durability verification tests have continued, and in 2018, the aging solidification properties were confirmed after 19 years following large-scale field tests. Additionally, follow-up investigations were conducted on areas where liquefaction countermeasures had been implemented with this injection material before the Great East Japan Earthquake, confirming that there was no damage to the improved ground. [Feature 1] - It is an environmentally friendly injection material based on active silica colloid obtained by removing the alkali from water glass through ion exchange. - All components of the injection liquid are inorganic... (continues to Feature 2)

• Ground improvement
• Ground improvement materials
• Coastal construction

The ground improvement, liquefaction countermeasures, and seismic reinforcement using the permanent grout injection method as part of the main construction work require a lasting improvement effect. Therefore, preliminary mixing tests are crucial. In 2007, we established the main injection testing center, which has testing research capabilities, data accumulation functions, and consulting functions. At this center, we conduct preliminary mixing tests using soil samples taken from the site, and by adding insights gained from years of joint research between industry and academia to the data obtained, we provide a higher reliability quality to construction companies, clients, and other stakeholders. Currently, ground improvement work using the permanent grout injection method is on the rise, with over 1,200 construction achievements and injection volumes exceeding 600 million liters. The Ground Injection Development Organization, established in 2003, is one of the largest corporate organizations in the field of ground improvement using chemical injection methods, continuously conducting research and development. As a result, we are working to promote integrated technology that combines practical injection materials and methods as the permanent grout main injection method. By cooperating and collaborating with the Ground Injection Development Organization at the main injection testing center, we aim to promote the permanent grout injection method and improve technology, accurately responding to everyone's needs.

• Ground improvement
• Analysis and prediction system
• Ground foundation construction method

The "Hardlizer Seven" includes the instant-setting type "Hardlizer Seven S" and the slow-setting type "Hardlizer Seven L," making it suitable for all types of injection methods. The "Hardlizer Seven" is a durable inorganic solution type silica sol grout, which was developed in the early 1970s and has made significant advancements as a result of years of research and development, boasting a track record of 50,000 construction cases. The well-known trademark "Silica Sol" in the field of chemical injection refers to the injection material based on non-alkaline water glass obtained by neutralizing the alkalinity of water glass with acid. Notably, research on the durability of chemical injection conducted at the Toyo University Institute of Industrial Technology's Yokokura Laboratory, which began in 1982, clarified the long-term durability of silica sol grout, and this was demonstrated by excavation surveys at construction sites from 17 years ago. Additionally, large-scale outdoor tests have confirmed the permeability and solidification properties after 19 years. 【Feature 1】 1. Excellent applicability: The gel time can range from instant-setting to slow-setting, allowing it to be applied to all types of injection methods. 2. Excellent solidification: It excels in solidification below the groundwater level, ensuring that all injected material solidifies in the soil. It also has excellent water-stopping properties... (continues to Feature 2)

• Ground improvement materials
• Ground foundation construction method
• Railway Construction

In conventional liquid injection methods (such as the double pipe double packer method), the injection pipes used for injection (referred to as the injection outer pipe, primarily made of PVC) are typically left in the ground. This has posed challenges when excavation or other activities are carried out after injection, as the remaining injection pipes can become obstacles during excavation. Therefore, we developed an environmentally friendly biodegradable injection pipe that has similar workability to existing injection pipes and decomposes over time by microorganisms in soil, freshwater, seawater, and compost, ultimately turning into carbon dioxide and water.

• Civil Engineering Method
• Road construction
• Earth retaining wall/foundation reinforcement

The "Permanent Grout Injection Method" is one of the chemical injection methods. The purpose of improving this method is for permanent improvement, but in recent years, its application range has also expanded as an injection method for temporary improvement. The injection material used is "Permanent Grout," which has been theoretically and empirically validated for permanence, and the injection form is designed to be permeation injection that does not disturb the sedimentary state (skeletal structure) of the ground, with the principle of uniformly improving the ground. The "Expakka Method" involves attaching bag bodies (geo-bags) at intervals to the injection outer pipe, inflating these bag bodies to anchor them in the ground and form soil packers, which enables permeation injection by injecting from a large space, allowing for rapid improvement over a wide area. The Expakka Method series includes Expakka-N Method, Expakka NEO Method, 3D-EX (Expakka) Method, and Expakka Lotus Route Method. [Demonstration of Long-Term Durability Over 19 Years Through Large-Scale Field Injection Tests] The results of demonstration tests on permeation solidification and aging solidification through large-scale field injection tests combining Permanent Grout (injection material) and injection methods (such as the Expakka Method) have been evaluated, and the method received the 2002 Technical Development Award from the Japanese Geotechnical Society (Yonekura, Shimada).

• Ground improvement
• Foundation construction
• Harbor Construction

The "Permanent Grout Injection Method" is one of the chemical injection methods. The purpose of improving this method is for permanent improvement, but in recent years, its application range has also expanded as an injection method for temporary improvement. The injection material used is "Permanent Grout," which has been theoretically and empirically validated for permanence, and the injection form is designed to be a permeation injection method that does not disturb the sedimentary state (framework structure) of the ground, with the principle of uniformly improving the ground. The "Super Multi-Point Injection Method" achieves ideal permeation injection and high workability by injecting at an extremely low discharge rate of 3 liters per nozzle, simultaneously from 32 nozzles per pump. 【Demonstration of 19-Year Long-Term Durability through Large-Scale Field Injection Tests】 The results of large-scale field injection tests combining Permanent Grout (injection material) and injection methods (such as the Super Multi-Point Injection Method) have been evaluated for their permeation solidification and long-term solidification properties, earning the 2002 Technical Development Award from the Japanese Geotechnical Society (Yonekura, Shimada). Confirmation tests have continued even after the large-scale field injection tests, and in 2018, the long-term solidification properties were confirmed 19 years later.

• Airport facilities
• Harbor Construction
• Ground improvement