模块为中空结构，组合砌筑后纵向孔孔相通，横向孔孔相贯，孔芯浇注后，形成现浇混凝土网状结构，起到了二次补强和防水作用。
The modules are of hollow structure, with connected holes vertically and interpenetrated horizontally; the cast-in-place concrete mesh structure is formed after pouring of the cores of holes, playing the role of secondary reinforcement and waterproof.