Segment Fixing Pile
The segment fixing pile consists of a steel structure cylinder that houses a bladder. The steel structure cylinder is screwed into the grouting hole drilled into the segment. By injecting double-liquid grout into the steel structure cylinder, the internal bladder is squeezed out into the gap between the segment and the surrounding rock.
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Segment Fixing Pile
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Description:
Introduction
The segment fixing pile consists of a steel structure cylinder that houses a bladder. The steel structure cylinder is screwed into the grouting hole drilled into the segment. By injecting double-liquid grout into the steel structure cylinder, the internal bladder is squeezed out into the gap between the segment and the surrounding rock.
Application
Segment floating formed during TBM construction
Solutions for small - radius construction
Advantages
Control of Segment Floating：
Segment floating refers to the upward displacement of tunnel segments after exiting the shield tail, primarily caused by geological conditions, groundwater pressure, and synchronous grouting. This phenomenon can lead to segment misalignment, cracking, damage, and even axial deviation, severely compromising tunnel quality and safety.
Mechanisms of Control by Segment Fixing Piles：
Rapid Solidification: The two-component grout within the fixing piles solidifies quickly, forming a robust mass that embeds between the segments and surrounding soil.
Soil Constraint Utilization: Leveraging the confining force of the surrounding soil, the fixing piles effectively restrict segment floating, ensuring tunnel stability.
Control of Segment Deviation： During curved tunnel excavation, shield machines must follow the design alignment, resulting in unbalanced steering forces. This imbalance imposes horizontal stresses on segments, leading to uneven loading, misalignment, extrusion damage, and seepage failures.
Mechanisms of Control by Segment Fixing Piles： Filling Over-excavation Gaps: The piles fill voids created during shield tunneling, enhancing axial rigidity. Restricting Misalignment Deformation: By reinforcing structural integrity, the piles mitigate segment misalignment caused by eccentric forces.
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