Micropiles are used for many applications, including underpinning existing foundations. Improving of technique is required to support large loads and quick control methods are demanded. Under this project, a micropile test site was established at Algete in Madrid, Spain. Three micropiles were installed with 3, 5 and 7 meters each in length, borehole diameter of 150 mm and a steel casing external diameter/thickness of 88.9/9 mm. Dynamic load testing was performed in the test area. A little hammer was developed for testing with a variable mass between 500 Kg and 1000 Kg that can run along one meter. The Pile Driving Analyzer (PDA) technique was used to investigate the ultimate capacity of the micropiles. A static load test was performed to estimate the bearing capacity of the micropiles. The results of the testing program demonstrate that PDA testing may provide accurate information using this
technique. The paper, therefore, will discuss the techniques used for PDA testing of the micropiles, and compare the results of the PDA tests to the data from a static load test.