Compatibility and installation specifications of the fastening system
- How can different types of elastic clips achieve compatibility with other fastening components?
Type I elastic clips are compatible with specific clamp and gauge plates. Through reasonably designed dimensions and structures, they ensure reliable connection with rails and sleepers. Type II elastic clips are precisely matched with supporting components such as steel plates in terms of clamping force and installation method. When selecting elastic clips, it is necessary to ensure compatibility with the geometric dimensions and mechanical properties of other components according to the rail type, sleeper form and design requirements.
- What are the installation specifications for fishplates when connecting with rails?
Before installing the fishplate, clean impurities such as rust and oil stains on the connection surfaces of the rail and the fishplate. The fishplate bolts should be tightened according to the specified torque. Generally, the torque for 8.8 - grade bolts is 300 - 350N·m, and for 10.9 - grade bolts, it is 400 - 450N·m. The installation sequence should be symmetric. First, tighten the middle bolts, and then tighten them sequentially towards both ends to ensure a tight connection and uniform stress.
- What are the selection principles for bolts in the fastening system?
Select the bolt strength grade according to the force on the fastening part. For example, use 8.8 - grade bolts for ordinary parts and 10.9 - grade bolts for heavy - load or key parts. The bolt diameter should be suitable for the hole diameter of the connecting parts to ensure smooth installation. At the same time, consider environmental factors. In humid or corrosive environments, select galvanized or stainless - steel bolts with good corrosion resistance.
- How does the under - rail pad work in coordination with the elastic clip and the rail?
The under - rail pad provides elastic cushioning, reducing the impact of train operation on the rail and the sleeper. The elastic clip fixes the rail on the sleeper through clamping force, and the elastic deformation of the under - rail pad can help the elastic clip better maintain stable clamping force. When the train passes, the pad absorbs part of the energy, reducing the force on the elastic clip and the rail. The three work together to ensure the smoothness and stability of the track.
- How to conduct quality inspection when installing the fastening system?
After installation, check whether the installation positions of each component are correct, whether the elastic clip is clamped in place, and whether the fishplate is closely attached to the rail. Use a torque wrench to spot - check the bolt torque to ensure it meets the standard. Measure the gauge with a gauge ruler and control the deviation within the specified range. Regularly check the loosening and wear of the fastening system and maintain and replace it in a timely manner.