Standing type mechanical loading device for three-ring prototype irregular shield segment

The invention provides a standing type mechanical loading device for a three-ring prototype irregular shield segment. The device comprises a full-steel loading reaction frame, a loading system, a control system and a testing shield segment; the full-steel loading reaction frame is positioned by a vertical standing manner; three-ring segments which are spliced into rings are vertically positioned in the full-steel loading reaction frame by a standing manner; a top plate and two sides of each segment are loaded through annular jacks which are fixed into reserved holes in the full-steel loading reaction frame; the actual pressure value of water and soil on each sectional segment is respectively calculated under the condition that the ground reaction pressure is considered; the load is applied to a center point of the arc length of an outer arc-shaped surface of the sectional segment long the outer arc-shaped surface of each segment in the radial direction through the annular jacks; a bottom plate of each segment that the segment independently balances the force borne through a liquid bag; a propping and pushing force applied to each segment during excavating a shield is simulated through a longitudinal pulling rod system; the control system comprises a jack oil pressure control system and a liquid bag water pressure control system. With the adoption of the device, the mechanical behavior characteristics of the segments under different stratum conditions can be really simulated, so that the basis is provided for the design of the irregular shield segment and the construction of an irregular shield tunnel, and the test result meets the objective fact.