Testing device for shear-resistant fatigue property of chemical anchoring stud

Abstract

The invention provides a testing device for a shear-resistant fatigue property of a chemical anchoring stud. The testing device comprises a fatigue tester transverse beam (2) and a fatigue tester pedestal (3), wherein the fatigue tester transverse beam (2) is connected with the fatigue tester pedestal (3) by fatigue tester uprights (1), and a fixture assembly guaranteeing a pure shear stress state of the stud during a fatigue test is arranged between the fatigue tester transverse beam (2) and the fatigue tester pedestal (3). The testing device is reasonable in design, simple in structure and easy to operate and use; a T-shaped flange is arranged, and connected by a bolt, so that the testing device can be matched with testers in multiple specifications for use; and an application scope of the testing device is wider.

Description

Technical field [0001] The invention relates to the technical field of a test device for shear fatigue performance, in particular to a test device for the shear fatigue performance of a chemical anchor stud. Background technique [0002] At present, a large number of chemical anchoring studs are used in civil engineering to strengthen and strengthen the in-service bridge structure, especially in the anchoring of high-speed railway ballastless track slabs. In order to ensure the effective anchoring between the ballastless track slab and the bridge deck under the dynamic load of the train, it is usually used to drill holes in the ballastless track slab and the bridge deck, then fill the holes with chemical anchoring glue, and insert studs to anchor the two Together. Under the dynamic load of the train, once the stud shear failure occurs, it will directly affect the stability of the high-speed railway track slab, thereby affecting the safety of the high-speed railway line operation...

AI Technical Summary

Problems solved by technology

At present, there are still many problems in the shear fatigue performance test of chemical anchor bolts: (1) After a long time of use, the fixture itself is prone to loosening or position deviation, resulting in the failure of the shear force to act vertically on the test object. Affect the reliability of the test results; (2) After the stud is subjected to the shear force, the contact surfaces of the two fixtures contact and generate friction, which interferes with the shear force acting on the stud and affects the test results; (3) Due to the fluidity of the chemical anchoring glue, it often occurs that the chemical anchoring glue overflows and bonds the fixture together, which seriously affects the shear force of the stud; (4) The existing fixture has poor versatility and reusability , often after a test is completed, the fixture is invalid because the consolidated chemical anchoring glue cannot be removed, and the specific fixture can only be used for a specific fatigue testing machine, and the field of use is narrow; (5) the existing fixture cannot be used in After the shear fatigue test of the chemical anchor studs is completed, the pullout ultimate bearing capacity test after the stud fatigue is further carried out, resulting in incomplete collection of mechanical performance parameters

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