NSMB Pile Splice System for Precast Concrete
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Solution Overview
Problem
Existing methods for connecting prestressed-precast concrete pile segments often fail to provide sufficient resistance in unforeseen soil conditions, requiring site preparation and drilling, which is impractical and may not achieve the required splice capacity.
Innovation Solution
A near-surface mounting bar (NSMB) pile splicing system that uses FRP bars and alignment elements to connect prestressed-precast concrete pile segments, with surface mount grooves and reinforcing strips to enhance shear resistance and alignment, allowing for rapid and durable splicing in both planned and unforeseen situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional splicing methods are used for precast concrete piles, then the splice capacity may be insufficient in unforeseen soil conditions, but site preparation and drilling required to improve capacity is impractical and time-consuming
Solution Approach 1:
The receiving (lower) pile segment is pre-prepared with reinforcement, holes, and embedment elements during manufacturing at the precast plant. This preliminary action ensures that when splicing is needed at the construction site, the necessary components are already in place, eliminating the need for time-consuming site preparation and drilling operations while maintaining the required splice capacity
Solution Approach 2:
The pile system is divided into multiple precast segments that can be manufactured separately with optimized reinforcement configurations. The receiving segment is segmented to include pre-installed dowels and reinforcement zones, allowing rapid assembly at the site without requiring additional on-site construction activities
2Strength
If the receiving pile segment is prepared with additional reinforcement and holes for splicing, then the splice capacity is improved, but the complexity of pile manufacturing increases
Solution Approach 1:
All necessary reinforcement, dowels, holes, and embedment elements are installed during the initial precasting process at the plant. This preliminary preparation consolidates multiple operations into a single manufacturing stage, avoiding the need for complex on-site modifications while achieving the required splice capacity
Solution Approach 2:
The receiving pile segment is designed to be self-sufficient for splicing operations, with all necessary reinforcement and connection elements already integrated during manufacturing. This self-service approach eliminates the need for additional on-site preparation activities and reduces the complexity of field operations
3Strength
If drilling holes at the construction site to receive dowels is performed, then the splice capacity can be improved, but the practical limitations at the site make this in some cases not possible
Solution Approach 1:
All holes for dowels and reinforcement elements are pre-drilled and prepared during the precasting process at the plant, where equipment and conditions are optimal. This preliminary action eliminates the need for difficult on-site drilling operations, making the splicing process practical and straightforward at the construction site
Solution Approach 2:
The complex drilling and preparation operations are extracted from the on-site construction process and relocated to the controlled precasting environment at the plant. This extraction removes the operational difficulties associated with site preparation while maintaining the structural integrity and capacity of the splice connection
Data Source
AI summary
Near-Surface Mounting Bar (NSMB) Pile Splice systems and methods are provided as an alternative splicing method to connect driven precast concrete pile segments. These systems are applicable to both unforeseen and preplanned splicing needs and provide excellent advantage especially for the unforeseen condition when other splice systems fail to provide the required capacity. These systems offer completely unique and new methods of connecting and splicing precast prestressed concrete pile segments and all other prismatic precast concrete elements.