Ballastless Track Fine-Tuning Accessory System and High Smoothness Control
What is the biggest difference between ballastless and ballasted track fasteners?
Ballasted track: height and direction are adjusted by the ballast; ballastless track: the foundation is fixed, and fine-tuning relies entirely on the fasteners. Therefore, ballastless fasteners must possess: three-dimensional adjustability, high precision, high retention, long lifespan, and full insulation.
How is the fine-tuning function of ballastless fasteners achieved?
Height adjustment: different thickness adjustment pads; gauge adjustment: different number gauge blocks, eccentric sleeves; front and rear adjustment: elongated holes, sliding structures; achieving millimeter-level or even sub-millimeter-level fine-tuning.
Why are the requirements for the elastic pad layer in ballastless track extremely high?
The foundation has extremely high rigidity, and almost all vibration and impact are borne by the pad layer; requirements include: low dynamic-to-static stiffness ratio, low creep, fatigue resistance, hydrolysis resistance, aging resistance, and a lifespan matching that of the track.
Construction prohibitions for ballastless fasteners:
Rough installation and striking of insulation components are strictly prohibited; mixing of parts of different specifications or from different manufacturers is strictly prohibited; mortar and concrete contamination of fasteners is strictly prohibited; and excessively thick pads must not be stacked in multiple layers.
Key inspection points for ballastless fasteners during operation and maintenance:
Torque attenuation; insulation resistance; pad deformation, damage, and aging; gauge and elevation changes; bolt corrosion, loosening, and cracks.