Pull Collar is special item which worked together with friction bolt 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 Friction Bolt at the beginning of support project.
Friction bolt 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 Friction Bolt tube body, a stopper outside of the support ring at one end will help the testing facility to pull the friction bolt and Friction Bolt out after assemble finished, and make the friction bolt 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 with double ring, it is more effective and uncostly.
▶ Inspect the Collar: Check the friction bolt pull collar for visible damage, deformation, or excessive wear before use.
▶ Position the Collar: Fit the pull collar onto the designated end of the friction bolt, ensuring that it is correctly aligned and compatible with the pull-testing equipment.
▶ Connect the Pull Tester: Securely connect the collar to the appropriate pull-testing device according to the equipment manufacturer's instructions.
▶ Perform the Pull Test: Apply the specified tensile load gradually and monitor the test results to evaluate the friction bolt's pull-out resistance and anchoring performance.
▶ Remove and Inspect: After releasing the load safely, remove the collar and inspect the component and connection points for damage before reuse.
