For more than 40 years, engineers around the world have used pile driving analyzers to test various pile types including driven piles, drilled piles, and screw-infused CFA piles. Many codes and regulations recognize the reliability and practicality of the PDA pile driving analyzer. Today, PDA may be the most commonly used inspection tool for deep Foundation quality assurance.
In general, for the conventional PDA test process, the engineer first arrives at the construction site, connects the acceleration sensor and force sensor to the pile, and then uses a long cable to connect the sensor to the PDA and enters the parameters such as the sensor calibration coefficient and the pile nature in the PDA . Under the action of pile hammer or free-fall hammer, the sensor collects signals and transmits them to PDA via cable for data processing, screen display and data storage.
PAX type PDA is changing this test process. PAX is equipped with a wireless data transmission tool, which eliminates data quality problems that may occur due to damage to the main cable and the connecting cable. The small and light transmitter can cover a distance of 100m, hang on the pile during the test, and transmit the data to the PAX receiving antenna. Each transmitter supports an acceleration sensor and a force sensor without the need for cable connections. PAX sensors are intelligent. These sensors can remember their own calibration coefficients and can transmit the calibration coefficients to PAX, avoiding input errors. The advantages of wireless transmission technology are obvious: lighter weight, reduced instrument damage, less errors, no need for cable cleaning and maintenance, less time to install sensors, and faster testing for driving pile monitoring (no cable connection and prior Install sensors on the ground to avoid climbing guides).
Wireless testing technology improves the data collection process, and remote testing has even greater advantages. Remote testing is usually carried out by field personnel installing sensors and turning on the PDA, and then the PDA engineer monitors the PDA test process in the office. The remote test technology can communicate with a remote PDA anywhere in the world in the office.
PDI began to conceive of remote testing technology and obtained it a few years ago, using mobile phone communication technology to integrate into PAL-type PDA. The new PAX PDA enables remote testing via the Internet, making data communication simpler, more reliable, and three times faster.
When PAX is in the field, just make a mobile phone call to test quickly. A replay test that observes how the bearing capacity changes with time can be easily completed. During the test, the PDA engineer in the office can see the data like visiting the site, evaluate the data quality, and feed back the analysis results and other problems to the field engineer in real time.
Wireless testing and remote testing technology simplifies the foundation pile testing process and encourages more streamlined design of dynamic tests (some codes allow reducing the safety factor or increasing the drag coefficient as the number of tests increases because more tests can reduce risk) Wireless test and remote test technology help to ensure the project schedule and project budget.
Pile driving analyzer-new name, same quality
The pile driving recorder PIR-A for screw-injected piles is now simplified in name and is collectively called pile driving analyzer PIR. The name change reflects the fact that PIR is an automatic monitoring instrument that is not only applicable to spiral-grouted piles, but also to long spiral bored pressure-filled concrete piles (CFA) and bored piles. The instrument is equipped with PIR-PLOT report generation software, which generates graphics of quality control parameters changing with depth and summarizes engineering information for inspection and settlement.
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Guangzhou Ou Dadi Instrument Equipment Co., Ltd.
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