STRIKING DEVICE FOR NONDESTRUCTIVE TEST AND CONTROL METHOD THEREFOR

To stably measure with high reproducibility by applying a constant vibration force to concrete without being affected by an irregular surface of the concrete while preventing penetration of concrete debris dust and the like.SOLUTION: A striking device for a non-destructive test comprises: an electromagnetic solenoid section 2 including an electromagnetic coil 6 and an electromagnetic path yoke 5 having a substantially cylindrical shape for accommodating the electromagnetic coil 6; a hammer head section 4 having an impact receiving part 4a at one end thereof and an impact face part 4b abutting against a structure C at the other end thereof; and a magnetic movable plunger section 3 having an impact part 3a at one end of the hammer head section 4 to strike the impact receiving part 4a and an elastic member 13 at the other end thereof to return the impact part 3a. The device is configured such that, when the impact part 3a of the movable plunger section 3 mounted in a substantially airtight manner strikes the impact receiving part 4a, the elastic wave is propagated from the impact face part 4b of the hammer head section 4 to the concrete structure C at the same time.SELECTED DRAWING: Figure 2 【課題】コンクリートの凹凸面に影響を受けることなく一定の加振力をコンクリートに与えることができ、コンクリートの破片粉塵などの侵入を防止して、再現性が高く安定して計測する。【解決手段】電磁コイル６と、電磁コイル６を収容する、略筒形状の電磁路ヨーク５とから成る電磁ソレノイド部２と、一端に打撃受け部４ａを、他端に構造物Ｃに当てる打撃面部４ｂを具備したハンマーヘッド部４と、ハンマーヘッド部４の打撃受け部４ａに打撃する打撃部３ａを一端に有し、他端に該打撃部３ａを引き戻す弾性部材１３を具備した、磁性を有する可動プランジャー部３と、を備え、略気密状に取り付けられた可動プランジャー部３の打撃部３ａが、打撃受け部４ａを打撃すると、同時にハンマーヘッド部４の打撃面部４ｂからコンクリートの構造物Ｃに弾性波が伝播されるように構成された。【選択図】図２