Prefabricated Bridge Segment Splicing via Embedded Steel Strands
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Solution Overview
Problem
The existing adhesive bonding method for prefabricated segmental bridges faces inefficiencies due to the need for temporary prestress removal, complex construction processes, and material-related issues such as hole formation and leakage.
Innovation Solution
A construction method that embeds steel strands within prefabricated segments, allowing them to serve as permanent prestress reserves, eliminating the need for temporary tensioning devices and simplifying the construction process by avoiding hole formation and enabling earlier equipment release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If temporary prestress devices (rolled threaded steel and tensioning bases) are used to apply compressive stress to the adhesive joint, then the joint can withstand the required compressive stress during construction, but holes are formed in the beam surface requiring sealing, and the construction process becomes complex with multiple removal and installation steps
Solution Approach 1:
The patent extracts the temporary prestress function from the complex system of rolled threaded steel and tensioning bases, and relocates it to pre-installed steel strands that are already embedded in the beam. This eliminates the need for hole formation and sealing while simplifying the construction process.
Solution Approach 2:
The steel strands are pre-installed and embedded in the beam segments before the adhesive bonding operation. This preliminary action ensures that the prestress application mechanism is already in place, eliminating the need for temporary devices and reducing construction complexity.
2Stress or pressure
If traditional temporary prestress facilities with rolled threaded steel are used, then compressive stress can be applied to the adhesive joint, but the equipment must be removed after use, creating holes in the permanent beam surface structure that require sealing
Solution Approach 1:
The steel strands serve dual purposes: they provide the temporary prestress during construction and remain as permanent embedded reinforcement in the beam. The system is self-sufficient, eliminating the need for separate temporary devices that would create harmful holes.
3Object-generated harmful factors
If concrete tensioning bases are used internally to avoid hole formation, then the beam surface remains intact, but the structure's self-weight increases
Solution Approach 1:
The patent changes the material parameter from concrete tensioning bases to steel strands. This parameter change achieves the dual benefit of avoiding hole formation while maintaining lower self-weight, as steel strands are lighter than concrete bases and can be embedded without creating surface holes.
4Stress or pressure
If the entire construction process follows traditional adhesive bonding methods with temporary and permanent prestress steps, then the adhesive joint can be properly stressed, but the construction period is extended and construction efficiency is reduced
Solution Approach 1:
The patent merges the temporary prestress function with the permanent reinforcement system by using the same steel strands for both purposes. This consolidation eliminates the need for separate temporary devices and reduces the number of construction steps, thereby improving productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances construction efficiency, reduces material requirements, ensures controllable quality of segment beam adhesive joints, and improves structural safety and reliability by integrating steel strands directly into the bridge's structural stress system.
Implementation Method 1
applying temporary tension to the steel strands that have passed through the reserved holes using tensioning equipment before the adhesive joint surface epoxy resin glue sets, to achieve the design allowed compressive stress
Implementation Method 2
The adhesive bonding method involves applying epoxy resin glue to the joint surfaces to adhere the two bridge segments
Data Source
AI summary
A construction method for splicing prefabricated segmental bridges, includes the following steps: manufacturing prefabricated segments composed of pier-top segments and non-pier-top segments, with steel strands embedded in each, and non-pier-top segments further equipped with reserved holes; erecting the pier-top segments; lifting the corresponding non-pier-top segments and applying epoxy resin glue on the corresponding adhesive joint surface; threading the embedded steel strands from the previously erected prefabricated segment through the reserved holes of the non-pier-top segment about to be erected; completing the adhesion of the adhesive joint surface; tensioning the steel strands that have passed through the reserved holes before the adhesive joint surface epoxy resin glue sets; releasing the beam launching machinery; applying permanent prestress; injecting high-strength mortar into the corresponding reserved holes; repeating the previous steps until all prefabricated segments are assembled.