一种盾构下穿浅基础建筑时的沉降控制体系
By combining ground pre-grouting reinforcement, deformation monitoring, and supplementary grouting reinforcement to achieve a settlement control system, the problems of ground settlement and soil disturbance during shield tunneling were solved, thus improving construction safety and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA CONSTR FIRST GROUP THE FIFTH CONSTR
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-17
AI Technical Summary
In shield tunneling, traditional reinforcement techniques are prone to causing secondary soil disturbance and ground heave in shallow overburden conditions, leading to cracks in buildings. Furthermore, the lack of a dynamic adjustment mechanism for borehole depth control increases the risk of surface subsidence, affecting construction efficiency and costs.
A settlement control system combining ground pre-grouting reinforcement, deformation monitoring, and supplementary grouting reinforcement is adopted. The ground strength is improved by pre-grouting reinforcement, the ground deformation is monitored in real time and supplementary grouting reinforcement is carried out when the deformation exceeds the limit, and the ground load is shared by the tunnel reinforcement structure to ensure the stability of the ground.
Effective control of ground settlement ensures construction safety, improves construction efficiency, reduces construction costs, and prevents excessive ground settlement.
Smart Images
Figure CN224515187U_ABST
Abstract
Claims
1. A settlement control system for shield tunneling under shallow foundation buildings, characterized by controlling the settlement of shallow foundation buildings above the shield tunneling under composite strata: The structure includes an existing building (1), a pre-grouting reinforcement structure (2), a shield tunnel (3), a deformation monitoring structure (4), and a supplementary grouting reinforcement structure (5). The shield tunnel (3) is located in the stratum, the existing building (1) is located above the shield tunnel (3), the grouting reinforcement structure (2) is located in the stratum and between the existing building (1) and the shield tunnel (3), the deformation monitoring structure (4) is located in the stratum and above the shield tunnel (3), the deformation monitoring structure (4) is used to monitor the deformation of the stratum during shield tunneling, and the supplementary grouting reinforcement structure (5) is located at the deformation point of the stratum to supplement and reinforce the deformed stratum.
2. The settlement control system for a shield to underpass a shallow foundation building according to claim 1, characterized in that: The grouting reinforcement structure (2) is set in the stratum below the existing building (1) and is set along the length of the existing building (1). The grouting reinforcement structure (2) includes a vertical grouting structure (21) and an inclined hole grouting structure (22). The vertical grouting structure (21) is set at intervals along the centerline of the existing building (1), and the inclined hole grouting structure (22) is symmetrically set on both sides of the vertical grouting structure (21).
3. The settlement control system for a shield to underpass a shallow foundation building according to claim 2, characterized in that: The vertical grouting structure (21) is set at 2m intervals in the length direction, the inclined hole grouting structure (22) is set at a 1m offset from the vertical grouting structure (21) in the length direction, the inclined hole grouting structure (22) is set at a 1m distance from the vertical grouting structure (21) in the width direction, and the angle between the inclined hole grouting structure (22) and the ground is 70°.
4. The settlement control system for a shield to underpass a shallow foundation building according to claim 1, wherein: The deformation monitoring structure (4) includes monitoring rods, which are spaced apart along the length of the shield tunnel (3).
5. The settlement control system for a shield to underpass a shallow foundation building according to claim 4, wherein: The monitoring rod is vertically installed in the stratum, with a depth of 3m in the stratum and its top end protruding 10mm above the stratum. The distance between adjacent monitoring rods is 5m.
6. The settlement control system for a shield to underpass a shallow foundation building according to claim 4, wherein: The supplementary grouting reinforcement structure (5) is vertically installed in the stratum and is located 1-2m away from the monitoring rod.
7. The settlement control system for a shield to underpass a shallow foundation building according to claim 4, wherein: The monitoring rod is a steel bar with a diameter of 20mm.
8. The settlement control system for a shield to underpass a shallow foundation building according to claim 1, wherein: It also includes a tunnel reinforcement structure, which includes ground grouting reinforcement (6) and interlayer grouting reinforcement (7). The ground grouting reinforcement (6) is located in the ground outside the shield shell, and the interlayer grouting reinforcement (7) is located between the segments of the shield tunnel (3) and the ground.