Static and Dynamic Pile Load Test Equipment

RIVERLAKE PLC controlled hydraulic jacking system is designed for pile load test up to 2000 tons where the load to be applied in different stages and displayed accurately in real-time. The plc pile load test jacking system provides 6 defaults tonnage options, user can preset the loading tonnage and holding period of time for each option. During pile load test operation, the whole process is run automatically, just select one of the preset tonnages and press the autorun button. the hydraulic jack will raise to its full stroke, upon reaching the preset load, the jacking system will stop automatically and hold the pressure for the preset period of time. during this process, the power station will auto-start for pressure compensation purposes if the pressure and load drop. The jacking system is equipped with a load sensor and pressure sensor, which will display the real-time load and pressure accurately. After testing is complete at this stage, select a new tonnage of the next stage, change the holding time if necessary, then press autorun to repeat the whole process.


Operation Video

Pile foundation inspection is a crucial link to ensure the construction quality of pile foundation projects. The quality of inspection work, the methods used in the test, and the test results are directly related to the safety and normal use of the building.

The main methods of pile foundation testing commonly used include static load test, core drilling method, low strain method, high strain method, acoustic transmission method, etc.

The static load test of pile foundation refers to the application of axial pressure, axial pull-up force step by step on the top of the pile or horizontal force at the same elevation of the bottom surface of the pile platform according to the use function of the pile, and observe the corresponding detection points of the pile over time. The resulting settlement, uplift displacement or horizontal displacement is determined according to the relationship between load and displacement (ie Q~S curve) to determine the corresponding vertical compressive bearing capacity of single pile, vertical tensile bearing capacity of single pile or horizontal bearing capacity of single pile Test method.

 

Pile foundation static load test is currently the most widely used method of various methods for testing the bearing capacity of pile foundations (including composite foundations and natural foundations), and is recognized as the most accurate and reliable test result, and is listed as pile foundations in various countries Engineering specifications or regulations.

The test uses various methods to artificially load, simulate the actual working state of the foundation or foundation, and test its load-bearing performance and deformation characteristics after loading. Its remarkable advantage is that the stress conditions are relatively close to reality, simple and easy to use, and the test results are intuitive and easy to understand and accept.

The pile foundation static load test can be divided into four steps:

The first step of pile foundation inspection: point selection test (to be determined jointly by the entrusting unit and the supervision unit). In principle, there should be no less than 3 pressure test points per unit of project. For projects above 1000 square meters, there should be at least one test point per 100 square meters. Pressure point: For projects over 3000 square meters, there should be at least one pressure test point for every 300 square meters.

The pile head is cleaned and roughened to a complete horizontal section, so that the pile top is flush with the natural ground, the high part is cut off, and the low part is filled.

The second step of pile foundation inspection: install the jack, and lay a 120mm thick medium sand cushion around the tested foundation pile, and place a 1.5 square meter bearing plate and cushion plate on the top, and fix the hydraulic jack to ensure the maximum load limit The pressure does not exceed 80% of the rated working pressure of jacks, oil pumps, and oil pipes. A steel-frame load-bearing platform is set up, and heavy objects can be piled up. Sandbags, concrete blocks, etc. can be stacked.

 

The third step of pile foundation inspection: install the observation system, install the automatic oil pump, the pressure sensor is connected in parallel to the electric oil pump oil supply pipe, the two displacement sensors are installed symmetrically on both sides of the pressure plate, and the receiver is perpendicular to the pressure plate and connected to the static Force load tester.

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