A stepped variable cross-section cast-in-place pile and an optimization design method thereof

By designing stepped variable cross-section cast-in-place piles, the problems of structural redundancy and low material utilization efficiency of large-diameter cast-in-place piles with uniform cross-section under composite loads are solved. This achieves stress balance in the pile-soil system and efficient material utilization, making it suitable for the foundation construction of high-voltage transmission lines.

CN122304359APending Publication Date: 2026-06-30XINZHOU POWER SUPPLY COMPANY STATE GRID SHANXI ELECTRIC POWER CORP
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XINZHOU POWER SUPPLY COMPANY STATE GRID SHANXI ELECTRIC POWER CORP
Filing Date
2026-03-25
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing large-diameter cast-in-place pile foundations with uniform cross-sections suffer from problems such as mismatch between cross-sectional resistance and internal force response, low material utilization efficiency, and high design redundancy under combined loads, making it difficult to achieve reasonable distribution of structural forces and effective activation of the potential of the foundation soil.

Method used

The stepped variable cross-section cast-in-place pile design is adopted. By combining the stress-enhancing section and the economic transition section, and using three-dimensional nonlinear numerical simulation and orthogonal experimental optimization design, the pile section resistance moment and external load effect are matched, structural redundancy is reduced, and the resistance of deep soil is stimulated.

Benefits of technology

It achieves stress balance in the pile-soil system, reduces material usage and engineering costs, improves material utilization efficiency, meets green building goals, and is suitable for high-voltage transmission line foundation construction in complex terrain.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122304359A_ABST
    Figure CN122304359A_ABST
Patent Text Reader

Abstract

This invention discloses a stepped variable cross-section cast-in-place pile and its optimized design method, belonging to the field of power transmission line foundations. It solves the problems of mismatch between cross-sectional resistance and nonlinear internal force response, insufficient mobilization of material bearing capacity, and high design redundancy in existing large-diameter pile foundations with uniform cross-sections for high-voltage transmission lines when subjected to complex composite loads. The stepped variable cross-section cast-in-place pile includes a stress-reinforcing section, one end of which is connected to the tower to be supported. The other end of the stress-reinforcing section has an integrally formed economic transition section, which is coaxially arranged with the stress-reinforcing section. The diameter of the economic transition section is smaller than that of the stress-reinforcing section, forming a stepped variable cross-section at the connection between the stress-reinforcing section and the economic transition section. The cross-sectional modulus of the cast-in-place pile along its depth is matched with the depth-based attenuation law of the external composite load effect. This invention is applied to transmission line foundations.
Need to check novelty before this filing date? Find Prior Art