Permanent Grout Injection Method "Super Multi-Point Injection Method (Simultaneous Multi-Point Injection Method)"

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Super multi-point injection method / multi-point simultaneous injection method

last updated：Dec 03, 2019

Official site

[Coastal Technology Research Center Certification: No. 14002] Demonstrated 19 years of aging consolidation through large-scale field injection tests!

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.

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basic information

**Features** 1) The standard discharge rate (injection speed) is a low discharge of 1.0L/min to 6.0L/min. This allows for control over the displacement of the injected ground. 2) A dedicated multi-pump capable of simultaneous injection at 32 locations is employed, providing high construction capability despite the low discharge. The injection plant is modular, enhancing workability in confined spaces. 3) The injection pipe uses a thin flexible pipe (injection thin pipe) with an inner diameter of 6mm, bound around a core material. The length of the injection pipe can be adjusted as needed, allowing for the placement of injection points in appropriate positions. 4) A management device (multi-multi system) is used to monitor the injection pressure and flow rate at each injection point, displaying, recording, and controlling this data in real-time, enabling precise injection construction management. 5) Dedicated injection materials are used. **Completion of the On-site Injection Testing Center** - At the on-site injection testing center, pre-mixing tests are conducted using soil samples collected from the site. By adding insights gained from years of collaborative research between industry and academia to the data obtained, we provide a higher reliability quality to construction companies and stakeholders such as business owners.

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Applications/Examples of results

【Special Injection Materials】 The ultra-multipoint injection method uses the following special injection materials: - Solution-type permanent grout: Inorganic solution type "Permalock Series" / Application: Liquefaction prevention, Gel time: Several seconds to several tens of hours - Silica sol grout: Inorganic solution type "Hard Riser Series" / Application: Water stopping and ground improvement, Gel time: Several seconds to several tens of hours 【Main Applications and Achievements】 Main target ground: Sandy soil and gravelly soil Applications: - Liquefaction countermeasures for foundation ground of structures in port facilities - Prevention of sand extraction from the back of quay walls and revetments - Soil pressure reduction measures - Long-term water stopping measures - Ground strengthening and increased bearing capacity - Liquefaction countermeasures under tanks - Ground strengthening during shield excavation, etc. Construction achievements: Over 160 cases 【Follow-up Survey After the Great East Japan Earthquake】 A follow-up survey was conducted on locations where liquefaction countermeasures were implemented using this method before the Great East Japan Earthquake, confirming that there was no damage to the improved ground. 【Application of Biodegradable Injection Pipes and Bio Tubes】 Biodegradable injection pipes "Bio Tubes" can be applied in projects where the removal of injection pipes is required after chemical injection or where environmental considerations are necessary. *For detailed technical materials and catalogs, please request through the inquiry form on our company website.