The construction plane of the project is straight line, according to the site conditions and taking into account the complexity of multi-work cross-working in the future structural construction, the main building structure layer lofting the internal beam columns and peripheral edge column control method. The inner beam column is a floor first-level control net consisting of 4 (L1-L4) first-level control lines for flat lofting, and the first-level control lines are reviewed using 4 review points of vertical projection.
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