In this study, ultrasonic detection device was applied to investigate connection part of concrete structure. Result of test, the internal void of connection part can be detected and it was possible to adopt the ultrasonic detection method to the maintenance of concrete structure.

• 노태길(한국시설안전공단 교량터널안전실 과장, 공학박사) | Noh Tae Kil
• 곽길호(한국시설안전공단 교량터널안전실 직원, 공학석사) | Kwak Kil Ho
• 길태형(한국시설안전공단 교량터널안전실 직원) | Kil Tae Hyung
• 고정(한국시설안전공단 교량터널안전실 직원, 공학석사) | Go Jung 교신저자