Socket Assembled Arch Rib for Dense Concrete Filling
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Solution Overview
Problem
The traditional construction method of Concrete-Filled Steel Tubular (CFST) arch bridges faces challenges in ensuring complete concrete filling due to radial restraint, leading to unfilled areas and reduced strength, with existing methods damaging the structure or compromising the bearing capacity when attempting to rectify these issues.
Innovation Solution
A socket assembled arch rib structure using double-layer CFST monomers with convex and concave parts for easy concrete filling, ensuring dense filling and improved strength, featuring a non-circular cross-section for stable connection and anchor members for enhanced reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the arch rib is closed in the ring direction and concrete is pumped from the lower end, then the steel tube can be used as construction formwork and load-bearing skeleton, but it is difficult to check whether concrete is filled completely and unfilled areas cannot be supplemented
Solution Approach 1:
The arch rib is divided into multiple segments with socket connections, allowing each segment to be filled with concrete separately and completely, avoiding the difficulty of checking and supplementing unfilled areas in a closed ring structure
Solution Approach 2:
The socket structure is prepared in advance during manufacturing, creating a controlled filling path that ensures complete concrete placement before the structure is closed into a ring
2Manufacturing precision
If vibration method is adopted to supplement unfilled areas, then concrete filling can be improved, but the steel tube structure is damaged and bearing capacity is affected
Solution Approach 1:
The socket structure is designed in advance to provide a controlled filling path, ensuring complete concrete placement during the initial pouring process and eliminating the need for subsequent vibration supplementation that would damage the steel tube
3Manufacturing precision
If drilling, grouting, and repairing methods are used to supplement unfilled areas, then filling defects can be corrected, but the bearing capacity of the arch rib steel tube structure is reduced
Solution Approach 1:
The socket connection structure is pre-designed to create a controlled filling pathway, ensuring complete concrete placement during initial construction and eliminating the need for drilling and grouting repairs that would compromise structural strength
4Manufacturing precision
If multi-point drilling is performed to repair unfilled areas, then filling defects can be addressed, but the strength of the arch rib steel tube is reduced and stress requirements cannot be met
Solution Approach 1:
The socket structure is designed in advance to provide a controlled filling path, ensuring complete concrete placement during the initial pouring process and eliminating the need for multi-point drilling repairs that would reduce steel tube strength below required stress levels
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 ensures complete concrete filling, reduces unfilled areas, enhances the strength and stability of the arch rib, and accelerates construction by allowing prefabrication and on-site assembly, while maintaining structural integrity and resistance to deformation.
Implementation Method 1
a first end of the inner tube protrudes from a first end of the outer tube to form a convex part, a second end of the inner tube is located in the outer tube, the outer tube is filled with concrete, and the concrete forms a concave part at a second end of the outer tube for socketing the convex part of the other first monomer
Data Source
AI summary
A socket assembled arch rib and an arch bridge including at least one first monomer, the first monomer includes an inner and outer tube snapped outside the inner tube, a first end of the inner tube protrudes from a first end of the outer tube to form a convex part, a second end is located in the outer tube, the outer tube is filled with concrete, and concrete forms a concave part at a second end of the outer tube for socketing the convex part of the other first monomer; for unfilled concrete area inside the CFST structure arch rib, a double-layer CFST monomer with convex and concave parts formed respectively at the end, and the adjacent monomers are connected with each other through the socket-fit of the convex and concave parts, which is convenient for the sub-monomers to fill the concrete in the steel tube, ensuring dense concrete filling.