Hang-related testing and experimental operations

basic information

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Applications/Examples of results

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Detailed information

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  [IT Test] Our company conducts non-destructive assessments of pile integrity using the IT system from Profound in the Netherlands. This test generates elastic waves by lightly striking the pile head with a hammer and measures the response (reflected waveforms) obtained from an accelerometer installed at the pile head, allowing for a quick and simple evaluation of the integrity of precast concrete piles and cast-in-place concrete piles, among others. ★ Features of the IT Test - Applicable to various types of piles - Battery-operated, so no power supply is needed ★ Data Obtained - Estimation of pile length - Estimation of the presence and location of cracks or cross-sectional defects

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  Rapid Load Test This is a test in which a weight is dropped onto the pile head to measure the load and displacement. It is a test for confirming the vertical bearing capacity of piles that does not require the installation of reaction piles or anchor-type reaction devices, unlike static penetration tests. This testing method allows for a reduction in construction time and can be conducted in smaller spaces compared to static penetration tests.

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  A borehole camera is a survey method that involves inserting a camera into a test hole drilled in piles or ground improvement bodies to observe the conditions inside the hole (on the hole wall). For example, in the case of cast-in-place concrete piles, it is possible to directly check for damage such as cracks or missing parts in the concrete by observing the hole wall with the inserted camera. The images captured by the camera are recorded in memory, allowing for the creation of high-resolution continuous images as a deliverable.

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  Repeated simple shear test The repeated tests to determine deformation characteristics generally involve repeated triaxial tests using cylindrical specimens and repeated torsional shear tests using hollow cylindrical specimens. The repeated triaxial tests target soil and soft rock, while the repeated torsional shear tests focus on cohesive soil and sandy soil. In the simple shear test, a cylindrical specimen is fixed to the testing machine with adhesive, and after applying vertical pressure, a shear force (τ) is applied from below, resulting in a uniform shear strain (γ) in the sample. From this, G and γ can be obtained from the microstrain level to the failure strain level.

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  Hollow torsion shear test Dynamic, static, and irregular wave loading tests are possible. Additionally, tests on unsaturated soil using double cells can be conducted, and S-wave velocity measurements can also be performed by attaching a bender element. Since the hollow torsion test involves twisting the specimen, sliding can occur at the top and bottom of the specimen during tests on solidified specimens, which may prevent accurate strain measurements. Therefore, special caps and pedestals are created to reduce sliding by bonding the specimen, allowing for shear tests to be conducted.

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  Repeated Large-Scale Triaxial Testing Dynamic and static loading tests can be conducted on gravel and coarse-grained materials such as rock materials and filter materials, as well as soft rocks, using specimen sizes ranging from φ50mm to φ300mm. Additionally, tests on unsaturated soils using double cells and Young's modulus measurements using LDT are also possible.

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  【Small-scale Triaxial Test】 Dynamic, static, and irregular wave loading tests are possible. Additionally, unsaturated triaxial tests using double cells, Young's modulus measurement through local displacement measurement using LDT, and S-wave velocity measurement using bender elements are also possible. Furthermore, we conduct tests tailored to specific purposes, such as repeated tests under displacement control.

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  Measurement of Soil Shear Wave Velocity Using the Bender Element Method Bender elements consist of two bonded piezoelectric elements, utilizing their properties of vibrating when a voltage is applied and generating a voltage when subjected to vibration. The measurement method involves using a function generator to apply a sinusoidal (or square) voltage to the vibrating part, generating shear waves (S-waves) in the specimen. These shear waves are converted into voltage signals at the receiving part, and the arrival time of the waves is measured using a digital oscilloscope. Measurements can be conducted in both uniaxial and triaxial conditions, as well as in hollow torsional shear tests.

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  Large-scale dynamic centrifugal load testing apparatus (Photo provided by National Research and Development Agency, Public Works Research Institute)