Application of Impact Imaging Method on Nondestructive Detection of Void Defects in Sandwich-Structured Immersed Tunnel

Figure 7

Schematic diagram of the compartment opening results and the grid layout of measuring points. (a) The layout drawing of opening position, (b) the details of the opening position, and (c) the layout of measuring points at opening position.

(a)

(b)

(c)