軌道交通的橋梁預應力索孔道內注漿密實度會影響結構的承載力和耐久性,因此預應力索孔道注漿密實度的無損檢測成為結構安全運營的關鍵。從理論上分析了應力波檢測橋梁預應力索孔道內注漿密實度的原理和方法,開展了試驗梁的沖擊回波法檢測試驗,并結合實際工程進行測試。試驗結果表明,所提方法可對橋梁預應力索孔道注漿密實度進行檢測,鉆孔內窺鏡法的驗證結果與測試結果一致,該方法具有較好的適用性。

The density of grouting in the prestressed ducts of rail transit bridges can affect the bearing capacity and durability of the structure. Therefore, nondestructive testing of the density of grouting in prestressed cable ducts has become the key to the safe operation of the structure. The authors theoretically analyzed the principle and method of stress wave detection of grouting compactness in prestressed ducts of bridges, conducted impact echo detection tests on experimental beams, and conducted tests in combination with practical engineering. The experimental results indicated that the proposed method can detect the grouting density of bridge prestressed cable ducts, and the results verified by the borehole endoscope method were consistent with the test results. This method had good applicability.