The invention discloses an antique building steel cap block, bracket arm and center block combined structure mounting and construction method. The method comprises the following steps that 1, components are decomposed; 2, the components are
cut and discharged; 3, combination and
welding are carried out to form prefabricated steel cap block and bracket arm basic components and pre-
assembly components; 4,
welding seams are ground; 5, trial splicing of medium independent steel components is carried out; 6, the steel components are subjected to
rust removal,
corrosion prevention, paint treatment and
numbering; and 7, the medium independent steel components are installed on site. The components are decomposed through a BIM technology, a plane detail drawing of each component is drawn by using AutoCAD, the small steel components are spliced, combined, welded and constructed in advance in a factory by using the steel components prefabricated in the factory, the number of the components directly installed on site is reduced, a cap block, bracket arm and center block combined structure is directly installed on an antique
building construction site from top to bottom, the installing space issufficient, the field operation
workload and construction difficulty are reduced, the working efficiency is improved, and the
investment cost is reduced while the project quality is ensured.