The results of field studies of bored piles using a complex methodology, including tests by the seismo-acoustic method and the method of ultrasonic inter-well monitoring, are presented. Complex tests made it possible to assess not only the uniformity of the pile shaft , the presence of various kinds of defects, but also made it possible to determine the compressive strength of the concrete of the pile shaft along its entire length. This is especially important because the piles will be subjected to loads of about 1000 tons. Ultrasonic inter-well monitoring, in addition to the seismo-acoustic method, makes it possible to get a more realistic picture of the pile structure, as well as to give the technologist and designer strength indicators of structural concrete piles with a step of 500 mm along the length of the trunk. This information is important both for work producers who have the opportunity to immediately respond to the shortcomings of concreting, and for designers who make timely adjustments to the calculation. Bored reinforced concrete piles with a diameter of ~ 800 mm were selected as an object of the study. The subject of the study is a seismo-acoustic (echo–pulse) method of monitoring reinforced concrete bored piles, inter-well ultrasonic monitoring. The purpose of the work: is to study the uniformity of the structure of bored piles; to determine the actual length of piles; to identify pile defects, to assess the compressive strength of concrete by ultrasonic pulse method.