Ground investigation service "Swedish-style sounding test"

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last updated：Aug 28, 2026

ジオテック

It is recommended in the "Guidelines for the Basic Design of Small-Scale Buildings" edited by the Architectural Institute of Japan.

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.

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**Geotech Ground Survey Features** ○ Report → Impactful color cover for clients → Two separate books for objective data and ground considerations ○ Allowable bearing capacity reference value display → Examination of residential ground from both bearing capacity and settlement perspectives → Corresponds to the Building Standards Act notification "Allowable Stress of Ground" ○ Level difference display ○ On-site survey → On-site surveyors are qualified under ISO 9001 → Wear measurements of the advanced screw points are conducted each time ○ Data analysis → Analysts are qualified under ISO 9001 (the company has 7 technical experts and geological survey technicians) → Utilizes the "GEODAS" database of 50,000 residential ground data from the metropolitan area for high-precision data analysis and foundation specification proposals ○ Ground warranty system → A "Ground Warranty System" applicable for 10 years up to 50 million yen based on survey results, if desired ○ Additional services → Soil sampling available → Confirmation of steel pipe pile support layers during SS testing → Current site surveying → Boring surveys and plate load tests also conducted ● For more details, please contact us or download the catalog.