A construction method for a concrete internal formwork
support system of an ultra-large wind tunnel diffuser section, comprising the steps of: S1. performing full
simulation modeling on a flow channel structure and steel formworks by means of BIM technology and on the basis of a construction drawing; S2. after factory
processing, using BIM data to recheck and assemble the steel formworks, and affixing QR codes; S3. performing on-site positioning and
layout on each sectional segment of the internal steel formworks; S4, before the internal formwork
support system is installed, BIM engineers using an internal
steel cylinder formwork BIM model to create installation
animation demonstrations, and conducting visualized disclosure for on-
site management personnel and workers, and the workers installing the internal formwork
support system on the basis of the order of the
animation demonstrations; S5. when construction for a polygonal-to-square main diffuser section base slab surface and a
structure support column concrete below same is complete and reaches strength, performing positioning and installation of steel formwork units and steel support truss units. The present invention can effectively ensure the effective integration of base slabs and steel formworks, prevent displacement of the steel formworks during installation, and reduce defects existing in construction, thereby improving the working efficiency.