ジオテック List of Products and Services

A method of injecting and mixing cement milk (a mixture of cement-based solidifying material and water) into soft ground to create columnar improved piles underground. This method is applicable when the soft layer extends from GL-2.0m to approximately GL-8.0m. However, it is not applicable in cases where most of the soft layer consists of humus soil, where industrial or household waste is accumulated, where there is groundwater, or where buildings are constructed immediately after earthworks on former marshland. Good ground for determining the improvement depth is defined as a continuous layer of cohesive soil with an N value greater than 3, or granular soil with an N value greater than 4.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

A method that involves spreading cement-based solidifying materials on soft ground, mixing, stirring, and compacting them with the original soil to create a slab-like solidified body. This method is applicable when the soft layer is distributed at a depth of GL-2.0m or shallower. However, it is not applicable if there is a water level within the improvement depth that makes mixing and stirring difficult, or if the improvement area extends to neighboring properties or roads, raising concerns about impacts on boundary blocks, neighboring houses, roads, etc. Good ground for determining the improvement depth is generally defined as a continuous layer of cohesive soil with an N value greater than 3 for cohesive soil and greater than 4 for granular soil.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

A support pile method using general structural carbon steel pipes STK-400 to support small-scale houses when the column improvement method cannot be applied, and when the building's load is supported only by the tip of the pile. This method is applicable when soft layers continue to a depth of GL-8.0m or more. In the case of steel pipe pile methods, there is a relationship between the building and the surrounding ground, and if adopted in areas where extreme ground subsidence occurs, it may lead to the phenomenon of the building lifting up (such as when embankment is done on extremely soft ground or ground with thick deposits of humus). The supporting ground for determining the length of the steel pipe pile is defined as having an N value of ≧15. The thickness of the supporting ground layer should, in principle, be continuous for more than 2.0m.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

When planning a basement for structures that exceed the design ground bearing capacity of 30 kN/m² → When it is necessary to embed the foundation to the angle of repose (30° line) For structures that are difficult to approve with ground improvement and would be over-spec with PC piles → Steel-framed buildings of 3 to 4 stories / retaining walls with a design ground bearing capacity of less than 100 kN/m², etc.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

Leading Edge Wing Easy to penetrate with a simple shape. Design possible with simple testing Design possible with SWS testing and ram sounding testing. Low noise, low vibration, and no spoil, environmentally friendly Extremely low vibration and noise, considerate of the surrounding environment, with no generation of residual soil, making it an environmentally friendly clean construction method.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

The RES-P method is a type of piled raft foundation method. It involves driving pipes (thin steel tubes) into weak ground, strengthening the ground through the combined effect of the ground and the pipes to prevent settlement, and is a foundation reinforcement method for residential buildings.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

The Tiger Pile method combines the stable material strength of steel pipe pile methods with the large frictional force of soil cement column methods, compensating for the variability in column strength that is a disadvantage of the soil column cement method with the steel pipe, while the soil cement column method compensates for the small frictional force that is a disadvantage of the steel pipe pile method, effectively canceling out the shortcomings of both methods and demonstrating high bearing capacity.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

Compatible with all types of ground The Σ-i method is a highly versatile ground reinforcement technique that is compatible with all types of ground, including sandy, gravelly, and clayey soils. Design using the converted N values from SWS tests (screw weight penetration tests) and ram sounding tests is possible.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

High-performance steel pipes are equipped with tip wings that are 3.0 times and 3.5 times the diameter of the steel pipe at the tip, suitable for clayey and sandy ground with equivalent N values of 5 to 15. Design using the equivalent N values from the SWS test (screw weight penetration test) is possible.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

The Pure Pile Method (PP Method) uses a drilling rod equipped with a conical-shaped excavation head to excavate while pushing the ground laterally, constructing a pile-like column by replacing it with cement milk up to the support depth.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

High quality It is a reliable quality backed by numerous experimental results. Performance confirmation tests conducted on sandy soil, clayey soil, and loam have confirmed that the coefficient of variation is below 25%. Since the variability setting values have been obtained through performance confirmation tests, quality inspection is primarily conducted using "Inspection Method A." We will carry out highly reliable construction based on the technical guidelines of this method.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

Survey Details Building Level Measurement (Perimeter) SWS Test (Screw Weight Penetration Test) (4-7 Points)

• Renovation and repair methods
• Residential foundations
• Consulting companies

The steel pipe pile driving method is a technique that uses jacks to press steel pipe piles into the supporting ground, allowing the building's load to be supported and adjusted.

• Renovation and repair methods
• Residential foundations
• Consulting companies

The tilting and sinking of buildings occur due to insufficient ground support caused by topographical and human factors, and there has been a tendency for this to increase in recent years. i-LIFT method (i-LIFT construction method) patent application: 2003-430063

• Renovation and repair methods
• Residential foundations
• Consulting companies

The decision on the method for settlement correction and its implementation will be made based on a site survey, taking into consideration the following points: - Site conditions (slope situation, condition of existing structures, foundation and exterior conditions, ground data, buried objects, etc.) - Whether the settlement is ongoing or has stabilized. - Whether to carry out a full correction under the foundation (for the purpose of preventing re-settlement) or a partial correction.

• Renovation and repair methods
• Residential foundations
• Pile and foundation work

This is a service where specialized engineers in foundation ground support the design. We comply with legal regulations, various standards, guidelines, and other specialized requirements.

• Ground foundation construction method
• Ground improvement
• Consulting companies

The ETP method is a type of rotary penetration steel pipe pile with a tip wing, which is driven into the ground by rotating a steel pipe that has a triangular excavation auxiliary blade with a circular enlarged base welded to its tip.

• Ground improvement
• Ground foundation construction method
• Pile and foundation work

At Geotech, we plan investigations tailored to your needs, ranging from historical and simple soil surveys to detailed investigations, and provide appropriate risk assessments. In the unlikely event that soil contamination is discovered, we offer assistance with remediation measures, providing consistent consulting as a designated investigation agency. For more details, please contact us.

• Site and ground investigation
• Environmental Survey
• Geological Survey

There is an increasing number of cases where historical investigations are conducted to dispel concerns about soil contamination during land transactions. A historical investigation is a service that examines how the land being considered for purchase was used in the past, using old maps and land registries, in order to assess the potential for soil contamination.

• Site and ground investigation
• Environmental Survey
• Other civil engineering services

"Settlement correction work" introduces the flow from the occurrence of differential settlement to the correction work. A commonly used method is the steel pipe pile driving method, which supports the building's load by driving steel pipe piles into the supporting ground using jacks, thereby supporting and correcting the entire structure. [Contents] ■ Building level measurement (current situation assessment) ■ Flow from the occurrence of differential settlement to correction work ■ Steel pipe pile driving method ■ Overview of each method *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods
• Residential foundations
• Consulting companies

At golf courses, proper drainage management is essential for maintaining the quality of the course. In particular, the permeability of the soil and the presence of contaminants greatly affect drainage performance. Inadequate drainage can lead to poor water runoff, unhealthy grass growth, and even soil contamination. Geotech's soil investigation services provide optimal plans tailored to the conditions of the golf course, ranging from historical surveys to detailed soil investigations. 【Usage Scenarios】 - Around drainage channels at golf courses - Soil in greens and fairways - Areas where water quality contamination is a concern 【Benefits of Implementation】 - Acquisition of soil information for appropriate drainage measures - Early detection and countermeasures for soil contamination risks - Maintenance and improvement of course quality

• Site and ground investigation
• Environmental Survey
• Geological Survey

In the real estate industry, the safety of land is crucial for maintaining and enhancing the asset value of properties. The risk of soil contamination can lead to reduced sale prices and the incurrence of remediation costs. GeoTech's soil investigation services offer optimal plans tailored to customer needs, ranging from historical land surveys to detailed soil investigations. Even if soil contamination is detected, we provide consistent support all the way through to remediation measures. 【Usage Scenarios】 - Risk assessment during real estate transactions - Consideration of effective land utilization - Investigation of land requiring soil contamination measures 【Benefits of Implementation】 - Visualization of soil contamination risks - Smooth negotiations in real estate transactions - Maintenance and enhancement of asset value

• Site and ground investigation
• Dismantling and moving
• Other civil engineering services

In the construction industry, accurate evaluation of the ground is essential to ensure the safety of buildings. Properly understanding the properties of the ground is important to prevent risks such as differential settlement and liquefaction, thereby achieving safe structures. GeoTech's soil investigation services provide optimal investigation plans tailored to customer needs, from historical surveys to detailed soil investigations, reducing risks in construction projects. [Usage Scenarios] - Ground investigation for new residential construction - Ground investigation for large-scale construction projects - Ground investigation and reinforcement work considerations for existing buildings [Benefits of Implementation] - Ensures the safety of buildings - Reduces risks in construction projects - Compliance with legal regulations - Support for remediation measures in case of soil contamination

• Site and ground investigation
• Environmental Survey
• Geological Survey

"Ganko Oyaji" is a reinforcement system that improves the shear strength, ductility, and seismic resistance of concrete slab foundations by applying carbon fiber sheets with a matrix resin. Since it involves the application of high-strength carbon fiber, it results in a strong, cost-effective, and aesthetically pleasing finish, making it suitable for existing homes. Reinforcement is done by applying carbon fiber with matrix resin to unreinforced foundations. Additionally, for cracked foundations, epoxy resin is injected under low pressure before applying the carbon fiber. 【Features】 - High strength (the cracked unreinforced foundation becomes significantly stronger than when it was new) - High durability (particularly resistant to salt damage and corrosion) - Increased shear strength, ductility, and seismic resistance - Significantly reduced construction time, making it cost-effective (construction period of 3 to 5 days) - Minimal noise as heavy machinery is not used *For more details, please refer to the PDF materials or feel free to contact us.

• Renovation and repair methods
• Residential foundations
• Consulting companies

The "i-LIFT method" is a technique that injects grout into the ground to lift and restore tilted or sunken buildings while also enhancing the ground's bearing capacity. Since the injection is performed while continuously measuring with a high-precision leveling instrument, fine adjustments to the level are possible. Additionally, construction can be carried out with compact machinery, making it feasible even in areas with limited space between adjacent houses. This method allows for a reduction in construction time compared to conventional methods. 【Features】 ■ Fine adjustments to the level are possible ■ Construction is possible in areas with limited space between adjacent houses ■ Reduction in construction time ■ Can be implemented even if ground improvement has already been performed ■ Can be applied to measures against ground subsidence *For more details, please refer to the PDF materials or feel free to contact us.*

• Renovation and repair methods
• Residential foundations
• Consulting companies

"Settlement correction work" introduces the flow from the occurrence of differential settlement to the correction work. A commonly used method is the steel pipe pile driving method, which supports the building's load by driving steel pipe piles into the foundation using jacks, thereby supporting and correcting the entire structure. [Contents] ■ Building level measurement (current status assessment) ■ Flow from the occurrence of differential settlement to correction work ■ Steel pipe pile driving method ■ Overview of each method *For more details, please refer to the PDF document or feel free to contact us.

• Renovation and repair methods
• Residential foundations
• Consulting companies

Liquefaction surveys (liquefaction assessments) are investigations that determine the potential for liquefaction during an earthquake based on ground and water level conditions. By understanding whether the site is prone to liquefaction and implementing appropriate liquefaction countermeasures, damage can be minimized. GeoTech Co., Ltd. offers four levels of methods, ranging from preliminary assessments based on documentation to detailed assessments involving boring surveys. 【Features of GeoTech】 ○ Experienced analysis staff (3 certified geological survey technicians) ○ Many employees hold qualifications as residential ground technicians and chief technicians from the NPO Housing Ground Quality Association ○ Ground consulting before and after the survey ○ Achievements in ground surveys and ground reinforcement work in the metropolitan area are compiled in the Ground Information Provision System (GEODAS), improving diagnostic accuracy through database creation and comparison with neighboring data ○ Courteous service to clients For more details, please contact us or download the catalog.

• Site and ground investigation
• Geological Survey Company
• Geological Survey

The ground investigation method commonly referred to simply as boring investigation is formally known as the boring and standard penetration test. This investigation utilizes holes drilled by boring (i.e., hollowing out) to conduct standard penetration tests that measure the hardness of the ground at intervals of one meter. Typically, this is carried out simultaneously with soil sampling. The data obtained from the standard penetration test is referred to as the N value, which can serve as a guideline for estimating ground stability. 【Features】 ○ The most commonly conducted ground investigation during design and construction in construction projects. ○ Clarifies the composition of strata by excavating the investigation site and observing the soil. ○ Measures the N value to understand the relative hardness and compactness of the soil in situ. ○ Can penetrate any deep or hard layer. For more details, please contact us or download the catalog.

• Site and ground investigation
• Geological Survey Company
• Geological Survey

At Geotech Co., Ltd., we offer a wide range of services including the commonly used Swedish sounding test for residential foundation surveys, as well as boring surveys suitable for large buildings and various soil tests. The "Swedish sounding test" was adopted around 1917 by the Swedish State Railways for investigating poor roadbeds and later became widely used in Scandinavian countries. It was introduced in Japan around 1954 by the Ministry of Construction for foundation surveys of embankments. In 1976, it was established as a JIS standard, and now most foundation surveys for residential houses are conducted using this test, known as JISA1221 (2002). 【Features】 ○ A rod with a screw point attached to the tip is loaded with up to 100 kg to measure penetration. ○ When penetration stops, the handle is rotated to screw it into the ground, measuring the half-turn Newton required to screw it in 1 meter. ○ During the test, sounds transmitted through the rod and penetration resistance are used to differentiate between sandy soil and clayey soil. ○ In soft strata, surveys can be conducted to a depth of about 10 meters. For more details, please contact us or download the catalog.

• Geological Survey Company
• Geological Survey
• Site and ground investigation

At Geotech, we plan investigations according to your needs, ranging from historical and simple soil surveys to detailed investigations, and we conduct appropriate risk assessments. In the unlikely event that soil contamination is discovered, we provide assistance with remediation measures, offering consistent consulting as a designated investigation agency. For more details, please contact us.

• Site and ground investigation
• Dismantling and moving
• Other civil engineering services