As a newly used material, steel thin-walled sonic-testing tubes used for the cast-in-situ piles have not a unified form of connecting.
混凝土灌注桩用钢薄壁声测管是一种较新的声测管材，其连接方法目前没有统一的形式。
As a newly used material, steel thin-walled sonic-testing tubes used for the cast-in-situ piles have not a unified form of connecting.
混凝土灌注桩用钢薄壁声测管是一种较新的声测管材，其连接方法目前没有统一的形式。
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