How is tension maintained in ropes or belts during installation?

Tension in ropes or belts during installation is primarily maintained using sheaves on car and counterweight crossheads. Sheaves are grooved wheels that guide and support the ropes or belts, ensuring they remain properly aligned and tensioned throughout the installation process. By routing the ropes over sheaves, it allows for effective management of the tension and reduces wear and tear on the materials involved. This method ensures that the ropes maintain the necessary tension to function safely and efficiently.

While the other methods mentioned might play a role in different contexts, they do not provide the same level of control and effectiveness in maintaining the required tension during installation as using sheaves. For example, merely using pulleys on the ground may not adequately manage tension in a vertical installation. Manually pulling ropes can be ineffective for achieving the precise tension needed, and using a hydraulic system is more about lifting or lowering rather than maintaining rope tension specifically.