Ground investigation service "Standard Penetration Test"

It is the most commonly conducted ground survey during the design and construction phases of construction work.

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.

basic information

【Advantages】 ○ Standardized testing methods in many countries, making evaluation and comparison of results easy ○ Allows for the collection of current soil samples and easy observation of soil (can be used for physical soil tests) ○ The application fields of N values are established in various standards ○ A large amount of historical data has been accumulated ○ Confirmation of bearing layers (N value ≧ 50 for 5m continuous) is possible 【Disadvantages】 ○ Requires a large investigation space (more than two parking spaces for cars) ○ Testing time is long (can take several days in some cases) ○ Relatively high cost ○ Data can become rough in extremely soft ground ○ There are sounds from impacts and motors ● For more details, please contact us or download the catalog.