Research on the correction method of the spacing of acoustic detecting pipes in pile detection

Research purposes: Because pile is a concealed engineering, the pipe spacing between measuring points is defaults to edge distance between acoustic detection pipes of pile top surface. So acoustic detecting pipes layout should be parallel to each other. When acoustic detecting pipe layout is not parallel to each other, the spacing between measuring points is not corresponding with the edge distance of pile top surface. Under the circumstances the edge distance of the pile top surface is defaulted instead of the spacing between measuring points which influence the data analysis of pile quality judgement. So correction method must be employed to correct the pipe spacing between measuring points, to bring the pipe spacing return to the site of the real or close to the real pipe spacing, thus to further judge the quality of pile. Research conclusions: (1) Establish the mathematical model about the spacing position relations of acoustic detecting pipe, deduce the correction method and compile the corrective procedure.(2) When the acoustic detecting pipes are parallel to each other, the revised spacing has no obvious change, which shows that this correction method will not bring external interrupt on normal section of acoustic detection pipe. (3) After abnormal section space of acoustic detecting pipes is modified, the pipe spacing and sound velocity value of measuring points can return to the corresponding real value.(4) The correction method has the very good practical value in pile engineering quality detection. ©, 2014, Journal of Railway Engineering Society. All right reserved.