Traditional cast-in-place caissons used in municipal power cable jacking projects often suffer from long construction periods and large site occupation.Based on power caisson engineering projects in the Ningxia region

this paper proposes a design method for an assembled caisson structure suitable for pipe jacking

inspired by the design principles of shield segments.The method achieves efficient construction through factory-precast well segments

full circumferential waterproofing

bolt-based assembly

and a peripheral-weight pressing technique.First

an integrated structure comprising precast top slabs

standard well segments

opening segments

cutting-edge segments

and post-cast bottom slabs was designed

with components connected mechanically.Second

the peripheral-weight pressing method

combined with cutting-edge sinking assistance

reduced the caisson wall thickness from the conventional 0.8 m to 0.35-0.45 m. Subsequently

optimization analysis using the Response Surface Methodology(RSM)and Genetic Algorithm(GA)determined the optimal parameters for segment bevel angle

wall thickness

and material strength.This optimization reduced structural stress by approximately 32% and concrete volume by about 86% compared with conventional methods.Three-dimensional finite element analysis demonstrated that the assembled caisson structure meets construction requirements for both sinking and pipe jacking.The proposed design method significantly enhances the efficiency and cost-effectiveness of power caisson construction in Ningxia

providing technical support for urban underground cable tunnel projects.