Evolution Of Rail Clamp Fasteners In Chinese Railroad Construction
In the history of China's railroad construction, three main types of rail clamp fasteners have been designed based on rail dimensions.
Bolted Type Clamp
Initially used in the early stages of rail construction.
Embedded wooden screws in concrete sleepers to connect fasteners and sleepers.
Obsolete due to technological limitations, and rarely used in current rail fastening systems.
63 Type Railway Clamps
Introduced for concrete sleepers without ditches.
Suitable for various steel rail sizes.
Gauge distance adjusted by replacing different-sized railway clamps.
70 Type Railway Clamps
Designed for concrete sleepers with ditches, specifically for 43KG and 50KG steel rails.
Allows gauge distance adjustment by replacing different-sized clamps.
Connection between screw spikes and sleepers forms the railway anchor.
Rarely used in new railway lines in China, primarily limited to repairs due to reduced elasticity and clamping force, leading to near elimination.
These developments in rail clamp fasteners reflect the evolution of technology and design considerations in China's railway construction history.
