Pull Collar is special item which worked together with friction bolt and split set for testing the initial anchor force after assemble. The result of the initial anchor friction force testing is a very important figure to tell if it is an efficient assemble, and will decide the performance of friction bolt and split set at the beginning of support project.
Friction bolt and split set body will go through the support ring first, and then were assembled into the hole together with the bearing plate, a force device will be used to test the initial force after assemble.
The center hole of the support ring was just fit the diameter of the friction bolt and split set tube body, a stopper outside of the support ring at one end will help the testing facility to pull the friction bolt and split set out after assemble finished, and make the friction bolt and split set moved a little to get a max.force figure during the movement, this is what we called "initial firction force", this force will get increasing by the time.
Support Ring usually is made by machining and treated by galvanizing,
Another alternative of the support ring, is the friction bolt and split set with double ring, it is more effective and uncostly.
The Key Questions to Ask Friction Bolts Manufacturer
Sep. 14, 2024
