Secant Pile Interface Treatment Using Steel Mesh and Ribbed Bars
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Solution Overview
Problem
The construction of secant pile walls in foundation pit engineering is often interrupted due to unforeseen factors, leading to delays and compromised integrity and anti-leakage performance at the concrete inside interfaces, necessitating an improvement in the anti-seepage and anti-leakage methods.
Innovation Solution
A concrete inside interface processing structure and method involving a secant concrete pile, formed plain concrete piles, rotary jet grouting piles, steel mesh sheets, ribbed steel bars, Y-shaped and U-shaped connecting pieces, and bar glue, where steel mesh sheets are anchored in the soil between piles and reinforced concrete piles are interlocked with rotary jet grouting piles to enhance stability and impermeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional secant pile construction is used, then the structure can be built efficiently, but construction interruptions occur due to unforeseen factors leading to concrete inside interfaces that compromise integrity and anti-leakage performance
Solution Approach 1:
The patent applies preliminary action by pre-installing steel mesh sheets and connecting pieces on the formed plain concrete piles before the construction interruptions occur. This preparation ensures that when construction is resumed, the interface treatment can be quickly implemented by spraying concrete onto the pre-positioned mesh structure, thereby maintaining anti-leakage performance without significantly increasing construction complexity
Solution Approach 2:
The patent uses composite materials by combining steel mesh sheets with concrete to create a reinforced interface structure. The steel mesh provides tensile strength and crack resistance, while the concrete provides compressive strength and sealing, together forming a composite material system that significantly improves anti-leakage performance at the concrete inside interfaces
2Stability of the object's composition
If simple pile construction is used, then construction speed is maintained, but the overall stability and integrity of the secant pile wall deteriorates due to construction interruptions
Solution Approach 1:
The patent applies segmentation by dividing the interface treatment into modular components: steel mesh sheets, Y-shaped connecting pieces, U-shaped connecting pieces, and ribbed steel bars. These segmented elements can be independently prepared and installed, allowing construction to proceed efficiently even with interruptions, while collectively providing the structural integrity needed for overall stability
Solution Approach 2:
The patent uses steel mesh sheets as intermediary elements between the formed plain concrete piles and the new concrete to be sprayed. This intermediary structure ensures proper bonding and stress transfer across the interface, maintaining overall stability while allowing construction efficiency to be preserved through the straightforward spray-concrete application process
3Reliability
If traditional interface treatment is used, then construction simplicity is maintained, but anti-seepage performance at concrete inside interfaces is insufficient
Solution Approach 1:
The patent uses thin steel mesh sheets as a flexible reinforcement layer at the concrete inside interfaces. The mesh sheets can conform to the pile surface and provide effective seepage resistance through their dense wire structure, while remaining easy to install and integrate with the concrete spraying process, thus maintaining ease of implementation
Data Source
AI summary
A concrete inside interface processing structure for secant pile construction, including secant concrete pile, formed plain concrete pile, rotary jet grouting piles, steel mesh sheet, ribbed steel bar, Y-shaped connecting piece, reinforced concrete pile, and U-shaped connecting piece; drilled holes are arranged at intervals along axis of the formed plain concrete pile; the ribbed steel bar is anchored in each drilled hole; the steel mesh sheet is formed by connecting longitudinal bars and transverse bars, and driven into a soil body between the formed plain concrete piles; the concrete layer is formed by spraying concrete on the steel mesh sheet; the reinforced concrete pile is cast at outside of the formed plain concrete pile, and tangent to the formed plain concrete pile, and interlocked with the rotary jet grouting piles; the rotary jet grouting piles are tangent to the formed plain concrete pile or secant concrete pile.