Deep foundation pit support structure secant pile anti-seepage construction method based on sonar detection technology

The invention discloses a deep foundation pit support structure secant pile anti-seepage construction method based on a sonar detection technology, which is characterized by comprising the following steps: step 1, construction preparation; 2, surveying and setting out; thirdly, a guide wall is constructed; fourthly, detection holes are arranged, whether the detection result can accurately reflect the actual leakage condition of the foundation pit or not is determined through arrangement of the detection holes, and the number and arrangement of the detection holes are scientific and reasonable; and fifthly, hole forming is conducted on the secant pile, and mechanical drilling construction is conducted on the drilled secant pile. The leakage position can be accurately obtained through an accurate measurement means after construction of the enclosure structure, leakage defect repairing can be conducted before excavation of a foundation pit, during construction of the foundation pit enclosure structure, pre-buryi