5.4.1 After an excavation cross-section is formed，cross-section survey shall be made.
5.4.2 The interval of the cross-section survey shall comply with the requirements in Table 5.4.2.
Table 5.4.2 Invertal of cross-section survey 212i/kulk1YjXVa0JWf8Zeq5SmJmtVOefoCB3haucF7z7JER/cI1Yq5e9WBCQ4lb
