A regular polygon prestressing force support for preventing circular tunnel deformation of side opening

The utility model discloses a regular polygon prestressing force support for preventing circular tunnel deformation of side opening, this support are sealed by at least three isosceles triangle truss end to end and form, the summit of isosceles triangle truss outwards, adjacent two triangular truss adopts bolt and welding hybrid connection's mode to connect, adjacent two the outside of isosceles triangle truss connection department and at every the summit of isosceles triangle truss department all is equipped with output jack outwards be connected with the backup pad on the output of jack. The utility model discloses a process the regular polygon structure of equipment in member, the hole outside the hole, stable in structure, the atress is even, and intensity, rigidity are reliable, the additional deformation that can control channel excavation process produces tunnel segment, the opening both sides tunnel segment safety of guaranteeing to incline, installation, dismantlement convenience, labour saving and t