Assembled Subway Station Connection Using Concave-Convex Structures
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Solution Overview
Problem
Existing bolted connections in assembled subway stations face issues with bearing small bending moments, uneven force transmission, structural stress concentration, and inability to meet high-performance waterproof requirements, while also being cumbersome and inefficient in construction.
Innovation Solution
A connection method using concave-convex structures, C-shaped grooves, and H-shaped steels with wedge structures, along with high-strength grouting and epoxy resin, to provide stronger, even force transmission and improved sealing between components, replacing traditional bolted connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bolted connection is used to connect components, then the connection can be assembled, but it cannot meet design requirements since it withstands relatively small bending moment
Solution Approach 1:
The connection structure is segmented into multiple functional elements: concave-convex structures for positioning, C-shaped grooves for embedding, H-shaped steel connecting members for force bearing, and grouting material for bonding. This segmentation allows each element to specialize in a specific function, collectively achieving high bending moment capacity while maintaining assembly ease.
Solution Approach 2:
The connection system uses composite construction combining concrete components with embedded steel structures (C-shaped and H-shaped steels) and grouting material. This composite approach leverages the compressive strength of concrete, the tensile strength of steel, and the bonding properties of grouting material to achieve superior bending moment resistance.
2Stability of the object's composition
If bolted connection is used, then components can be connected, but it has uneven force transmission which is likely to cause structural stress concentration
Solution Approach 1:
The concave-convex structures on component surfaces automatically provide positioning and initial force distribution when components are assembled. The geometry itself serves the function of alignment and load distribution without requiring additional active control mechanisms.
Solution Approach 2:
The connection method transitions from discrete bolt connection points to continuous contact surfaces through grouting material filling the gaps between components. This parameter change from point-to-line contact distributes forces continuously across the entire connection interface, eliminating stress concentration.
3Reliability
If bolted connection is used, then components can be assembled, but it cannot meet the high-performance waterproof requirements
Solution Approach 1:
The connection structure merges mechanical connection functions with waterproofing functions into a single integrated system. The grouting material simultaneously provides structural bonding and waterproof sealing, while the H-shaped steel connecting members provide both mechanical strength and a continuous barrier against water penetration.
Solution Approach 2:
The waterproofing achievement relies on composite construction where grouting material (cement-based or epoxy) fills all gaps and joints between components, creating a continuous impermeable barrier. This composite approach combines the structural concrete with the sealing properties of specialized grouting materials.
4Productivity
If bolted connection is used, then components can be connected, but the operation of screwing bolts is cumbersome and the construction efficiency is low
Solution Approach 1:
The traditional mechanical bolt-screw connection system is replaced with a grouting-based bonding system. Instead of requiring manual or automated bolting operations, the connection is achieved through pouring grouting material into the assembly gaps, which then cures to form a strong bond. This substitution eliminates cumbersome bolt operations entirely.
Solution Approach 2:
The C-shaped and H-shaped steel structures are pre-installed into grooves and positions before the grouting operation. This preliminary action ensures proper alignment and positioning, allowing the subsequent grouting to proceed quickly without requiring complex adjustment or tightening operations during the main connection phase.
Data Source
AI summary
An assembled subway station and a construction method thereof are provided. The assembled subway station includes a plurality of components combined in a ring shape, comprising a bottom plate component, two bottom corner components, two side wall components, a middle plate component, two top corner components, and a top plate component. Connection surfaces of each component are each provided with a concave-convex structure being matched with another concave-convex structure on a relevant connection surface of an adjacent component. Butt joint positions of two adjacent components are filled with sealing structures. The embedded grooves of two adjacent components are oppositely arranged, and connecting members for exerting opposite fastening forces on the two adjacent components are installed in the oppositely arranged embedded grooves. The opposite fastening forces are exerted on the two adjacent components through connecting members to ensure sealing structures at the butt joint position and achieve better sealing effects.