地盤試験所 List of Products and Services

We would like to introduce our "CPT" (Cone Penetration Test). The cone is inserted at a constant speed of 2 cm/s, capturing real-time ground information such as tip resistance qc, sleeve friction fs, and pore water pressure u. Data is read approximately every 2.5 cm, and automatic soil classification is performed. Compared to boring surveys that conduct standard penetration tests (SPT) every meter, the accuracy is 40 times greater. 【Features】 ■ Data is read approximately every 2.5 cm, and automatic soil classification is performed, resulting in 40 times the accuracy compared to boring surveys. ■ Investigations can be conducted at three locations per day to a depth of about 20 m, achieving 3 to 4 times the efficiency of boring surveys. ■ Liquefaction assessment using CPT complies with the "Guidelines for Structural Design of Building Foundations" (2001, Architectural Institute of Japan). * An English version of the catalog is also available for download. * For more details, please refer to the PDF materials or feel free to contact us.

• Site and ground investigation

The "rapid loading test" allows for the practical disregard of wave phenomena occurring in the pile body, and the stresses generated in the pile during the test yield results similar to those of static loading tests. Even with dynamic short-term loads, if a certain loading time is secured, the behavior of the pile is almost the same as that during static tests, where wave phenomena can be ignored. Rapid loading balances the inertial resistance of the pile body, the static resistance of the ground, and the dynamic resistance. [Types of Rapid Loading Tests] ■ Stynamic Test ■ Pseudo-Static Test ■ Hybrid Dynamic Test *For more details, please refer to the PDF materials or feel free to contact us.

• Site and ground investigation

The "impact loading test" is a testing method where wave phenomena in the pile body and resistance that depends on the velocity and acceleration of the pile body and the ground are significant. Sensors (accelerometers, strain gauges) are attached near the pile head, allowing for easy testing using a hydraulic hammer on site. However, there is a limit to the energy transmitted by the hydraulic hammer, and even when using the largest hammer, the maximum static resistance that can be confirmed is approximately 10 MN. [Test Overview (Partial)] ■ Loading time (tL): Approximately 0.01 seconds ■ Relative loading time (Tr): 5 > Tr ■ Loading method: Dropping a hammer or weight directly onto the pile head ■ Resistance/behavior during loading: Static resistance of the ground + resistance depending on the velocity and acceleration of the pile body and the ground + wave phenomena of the pile body *For more details, please refer to the PDF document or feel free to contact us.

• Site and ground investigation

The "Hybrid Dynamic Cushion" is a product that fuses perforated elastomer to a steel plate, converting the energy from the drop of a weight into rapid load and transmitting it to the pile head. During loading, the air in the holes is expelled, achieving a rapid load shape with a longer loading time near the maximum load compared to conventional loading methods. We have accurately assessed the deformation performance of this product through indoor compression tests, allowing us to plan precise loads and loading times. 【Features】 ■ Longer loading time near maximum load ■ Low rebound ■ Reusable ■ Prevents damage to the pile head *For more details, please refer to the PDF document or feel free to contact us.

• Site and ground investigation

The advantages of the "rapid load test" include the fact that it does not require reaction piles, which can be an issue in static load tests, and that testing can be conducted in the space occupied only by the drop weight device. Additionally, it has succeeded in shortening the construction period compared to static load tests. In the analysis of rapid load tests, the stress in the pile body is in a fully compressed state, allowing the wave phenomenon to be practically ignored. Static resistance can be calculated using a simple analysis (unloading point method), and compared to waveform matching analysis, it provides a more accurate static resistance. 【Advantages】 ■ Testing can be conducted in the space occupied only by the drop weight device ■ Shortened construction period ■ Wave phenomena can be practically ignored ■ Static resistance can be calculated using a simple analysis (unloading point method) ■ More accurate static resistance can be obtained *For more details, please refer to the PDF document or feel free to contact us.

• Site and ground investigation

The "Rapid Load Test of Piles (Hybrid Dynamic Test)" is a new loading test method standardized in the "Guidelines for Vertical Load Testing Methods for Piles and Explanations" (JGS1815-2002) by the Japanese Geotechnical Society. It is a rapid loading test using a soft cushion weight drop method that does not require reaction piles. In this testing method, the wave phenomena occurring in the pile body can be practically ignored, and the stresses generated in the pile body during the test yield results close to static loading. 【Features】 - Achieves a more stable and ideal rapid load using a hybrid dynamic cushion. - Realizes high-quality loading tests through ideal loading and high-precision displacement measurements. - By conducting multi-cycle tests until the ground resistance is fully mobilized, it is possible to accurately estimate the static ultimate bearing capacity of the pile. - This test method complies with the American Society for Testing and Materials (ASTM) standards for weight drop methods. *For more details, please refer to the PDF materials or feel free to contact us.

• Site and ground investigation

The "BS Sampler" is an unconsolidated and grouted liquid sampler that can be collected at any depth from the pit entrance or pile bottom. The sampling mechanism is a sliding sampling tube, and the collection volumes are available in three types: 15,000cc, 7,000cc, and 2,000cc. It allows for large sample collection through a wide opening, and the outer and inner tubes can be raised and lowered separately. 【Features】 ■ The sampling mechanism can be operated from the ground. ■ Completion of sampling can be confirmed from the ground. ■ No air bubbles are released into the piles or buried soil during sampling. ■ It can be completely sealed before and after sampling. ■ Large sample collection is possible through a wide opening. *For more details, please refer to the PDF document or feel free to contact us.

• Site and ground investigation

The Pile Integrity Test (PIT) is a testing method that utilizes the reflection of stress waves generated by striking the top of a pile to assess the integrity of the pile based on the information contained in the reflected waves measured by an accelerometer. It allows for quality control of piles after construction, verification of the integrity and length of existing piles when reusing them during structural replacements, and rapid and economical verification of the integrity of piles that have been damaged in earthquakes or other disasters. 【Features】 - Enables quality control of piles after construction - Allows for verification of pile length and damage to existing piles during reuse - Enables verification of the integrity of piles damaged in earthquakes - A rapid and economical testing method *For more details, please request materials or view the PDF data available for download.

• Non-destructive testing

The "Cone Penetration Test" is an in-situ testing method that allows for various assessments, including soil classification, bearing capacity, consolidation settlement, and liquefaction. By incorporating the latest electronic technology, it enables continuous and real-time acquisition of detailed ground information. Additionally, based on the relationship between cone tip resistance (qc) and cone sleeve friction (fs), it is possible to achieve soil classification without human error and to determine equivalent N values. 【Features】 ■ Continuous data collection at 2 cm intervals as standard ■ Ability to confirm thin layers approximately 2-3 cm thick ■ Enables the design of highly accurate soil structures ■ Investigation possible at a rate of 5-60 m per day ■ Data obtained without human variability *For more details, please download the PDF or feel free to contact us.

• Analysis and prediction system
• Other civil engineering services

The "Hybrid Dynamic Test" is a loading test method that allows for the practical disregard of wave phenomena occurring in the pile body, and it yields results for the stresses generated in the pile body during the test that are close to those of static loading. By adopting this test, it is possible to apply a stable and ideal rapid load. Additionally, by conducting multi-cycle tests until the ground resistance is fully mobilized, it is possible to accurately estimate the static ultimate bearing capacity of the pile. 【Features】 ■ A high-precision rapid loading test method that is extremely close to static loading tests ■ Soft cushion heavy weight drop method ■ Capable of applying an ideal rapid load ■ Accurately estimates the static ultimate bearing capacity of the pile *For more details, please download the PDF or feel free to contact us.

• Analysis and prediction system
• Other civil engineering services