Integrated treatment and construction method for settlement of a formed shield tunnel

CN122304768APending Publication Date: 2026-06-30CHINA RAILWAY 11TH BUREAU GRP CORP LTD +2

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: CHINA RAILWAY 11TH BUREAU GRP CORP LTD
Filing Date: 2026-03-12
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

During their service, shield tunnels experience settlement due to multiple factors, leading to structural defects. Existing treatment technologies are not targeted enough, and the control effects are prone to recurrence. Furthermore, construction in core urban areas is difficult, affecting the normal use of the tunnel and the safety of surrounding facilities.

Method used

The integrated treatment method for settlement of the pre-formed shield tunnel is adopted, including on-site investigation and data verification, saturated grouting behind the shield segment wall and construction of engineering piles at the bottom of the tunnel. The dense grout coating layer is formed by the grouting behind the wall and the engineering piles are reinforced, and the settlement treatment and structural protection are achieved in synergy.

Benefits of technology

It significantly enhances the tunnel's resistance to deformation, slows down settlement, ensures the stability and safety of the tunnel structure, reduces the impact on normal operation, and improves the scientific and economic efficiency of the treatment.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN122304768A_ABST

Patent Text Reader

Abstract

This invention provides an integrated construction method for managing settlement in precast shield tunnels. The method specifically includes on-site survey and data verification; saturated grouting behind tunnel segments; and construction of engineering piles at the tunnel bottom. These engineering piles consist of a row of vertical piles perpendicular to the shield tunnel and symmetrically distributed on either side of the vertical piles. The engineering piles are constructed using a deep-mixing pile machine or a jet grouting drilling rig. This invention operates on the core logic of "first consolidating the structure, then reinforcing the foundation." Through the synergistic effect of grouting behind the tunnel segments and engineering pile reinforcement at the tunnel bottom, it achieves the dual goals of settlement management and structural protection. Grouting behind the tunnel segments significantly enhances the tunnel's resistance to deformation and simultaneously constructs a stable structural foundation for subsequent tunnel bottom construction. The mixing piles at the tunnel bottom employ a combination of vertical and inclined piles to fundamentally improve the tunnel's bearing capacity, mitigate settlement trends, and ultimately achieve long-term control of tunnel settlement.

Need to check novelty before this filing date? Find Prior Art