ASTM D4945 Drilled Shafts And Bored Piles Pile Dynamic Analyzer Dynamic Load Tester High Strain Load Test Equipment Dynamic Pile Tests
This specialized instrument follows the testing standards specified in ASTM D4945, The primary purpose of the Pile Dynamic Testing Instrument is to assess the load-bearing capacity and integrity of piles in deep foundation systems.
Application
High strain dynamic pile monitoring of pile
Low strain pile integrity detection by reflected wave method (optional)
Load Capacity Evaluation: The instrument enables engineers to accurately determine the load-carrying capacity of piles. By subjecting the piles to high strain loads and measuring their dynamic response, it provides valuable data for estimating the pile's ultimate capacity and assessing its performance under various load conditions.
Quality Control during Pile Installation: The Pile Dynamic Testing Instrument allows for real-time monitoring and evaluation of pile driving during installation. It provides immediate feedback on pile integrity, driving stresses, and pile-soil interaction, ensuring that the piles are installed correctly and meet the required design specifications. This helps identify any potential issues or deviations, allowing for timely adjustments during the construction process.
Foundation Design Optimization: By accurately assessing the load-bearing capacity of piles, the instrument aids in optimizing foundation designs. Engineers can use the data obtained from the testing instrument to refine the design parameters, select appropriate pile types, and determine the necessary number and spacing of piles. This optimization ensures the structural stability and long-term performance of deep foundation systems.
Pile Integrity Evaluation: The Pile Dynamic Testing Instrument is capable of detecting potential defects or damage in piles. It can identify issues such as pile cracks, voids, or improper concrete placement, which may affect the pile's load-bearing capacity or long-term performance. This information enables engineers to take corrective measures and ensure the reliability and safety of the deep foundation system.
Research and Development: The instrument is also valuable in research and development efforts related to deep foundation engineering. It provides a means to study the behavior of different pile types, construction techniques, and soil conditions. Researchers can use the data obtained from the instrument to enhance understanding, develop new methodologies, and improve the design and construction practices in the field.
Software Feature
1. The fitting analysis of high strain bearing capacity detection of single pile can be carried out;
2. Fitting parameters can be adjusted conveniently and quickly and the recommended parameters table is provided so as to grasp the fitting skills quickly;
3. The simulated static load test curve and pile soil resistance distribution diagram can be output;
4. Original curve and fitting calculation curve can be output in a variety of modes;
5. A variety of soil models can be selected to fit a variety of geological conditions in China;
6. The output in Chinese and English is supported and a variety of international codes and requirements are met;
7. Common Windows platform operation makes the system run safely and reliably.
| Display method |
8.4-inch true-color LCD screen |
| Resolution: 800×600 (adjustable backlight) |
| Storage capacity |
16G electronic hard disk |
| Master control system |
Low power embedded system |
| Basic frequency≥1GHz Memory: 512M |
| Sampling interval |
High strain: 10-500μs multi-level adjustable |
| Low strain: 5-1000μs continuous adjustable |
| Floating point magnification |
1~256 |
| Recording length |
1k |
| A/D conversion accuracy |
24-bit instantaneous floating point |
| System noise voltage |
<20μV |
| Dynamic range |
≥100dB |
The following factors should be considered in the selection of hammer weight:
1) Influence of bearing capacity and bearing properties of pile. The greater the bearing capacity, the heavier the hammer; The greater the proportion of bearing capacity in the middle of the resistance, the heavier the hammer is required.
2) Influence of pile diameter. The larger the pile diameter is, the greater the inertia of the pile itself is, and the lifting capacity of the hammer and the pile hammer decreases, so the heavier the hammer is required. In addition, the increase of pile diameter will also increase the elastic limit of soil, resulting in the increase of hammer weight requirements.
3) Influence of pile length. The longer the pile, the greater the attenuation of stress wave in the propagation process, the more difficult it is to stimulate the resistance of the lower part and the end of the pile, so the heavier the hammer weight is required.
4) Influence of rock and soil elastic limit. The elastic limit of soil at pile side and pile end is larger. The larger the elastic limit of soil is, the larger the relative displacement of pile and soil required to stimulate rock and soil resistance is, and the heavier the hammer weight is required to be.
5) Influence of pile cushion. The selection of pile cushion should be on the premise of sufficient excitation of rock and soil resistance, choose soft pile cushion as far as possible.
6) Advocate "heavy hammer low blow". "Light hammer and high blow" can improve the hammer energy, but often break the pile head. "Heavy hammering and low hammering" should be advocated for high strain test pile.
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