Frame type isolation protection system and construction method thereof

The invention discloses a frame type isolation protection system and a construction method thereof. The frame type isolation protection system comprises two rows of precast piles, and the two rows of precast piles are vertically arranged on the two sides of an excavated tunnel respectively. Every two of the precast piles in each row are connected through a first cross support, the upper half segments of every two of the precast piles in each column are connected through a second cross support, every two of the precast piles in each column are connected through a tensioning mechanism, and the lower half segments of every two of the precast piles in each column are tensioned. The frame type isolation protection system and the construction method thereof have the beneficial effects that the isolation protection system is formed by the cross supports and the tensioning mechanisms of the precast piles in the two rows and multiple columns to replace a traditional box culvert, the structure is simple, and construction efficiency is high; the stress states of all the parts are reasonable, and disturbance to surrounding buildings is small; and every two precast files are connected through a steel wire rope in the corresponding tensioning mechanism, the position of the steel wire rope between every two precast files is grouted, and soil cross beams are formed at intervals to support the isolation protection system.