Experimental study on broaching self-locking anchor rod with mega prestressing force

Abstract

In order to solve the problem of applying super-tonnage prestressing force to the gate pier in the process of dam reinforcement, this paper presents a comparative study on the three groups of test specimens of prestressed counterbore self-locking anchor rod and unbonded prestressed anchor cable. T show: (a)both methods satisfy the needs of applying prestress, the experiment conducted on the gate pier that is to be renovated has tested the prestress loss of two schemes and the concrete stress in both free section and anchor section after applying the prestress. The results and counterbore self-locking anchor rod boasts shorter anchorage section and better applicability. (b) the anchorage sections of two schemes generate additional tensile stress, and the maximum additional tensile stress in the anchor rod features 54% less than that of anchor cable, smaller range of additional tensile stress and more reasonable stress state of concrete than that of anchor cable.

Innovative design of self-locking avoidance compliant mechanism of traction type coal baffle

“…Self-locking has always been a focus of mechanism design (Chen et al, 2021;Du et al, 2017;Liu et al, 2023;Qiu et al, 2024) . For example, Chen et al (2021) studied the effect of reinforcement diameter on reinforcement prestress release and tensile stress transfer on self-locking structure.…”

“…Self-locking has always been a focus of mechanism design (Chen et al, 2021;Du et al, 2017;Liu et al, 2023;Qiu et al, 2024) . For example, Chen et al (2021) studied the effect of reinforcement diameter on reinforcement prestress release and tensile stress transfer on self-locking structure. Du et al (2021) studied the self-locking problem of overrunning clutch, and established a mathematical model combined with the self-locking principle of rotation pair.…”

“…Theory of Inventive Problem Solving (TRIZ) was developed by Genrich Altshuller and his team (Rantanen and Domb, 2002;Kandukuri et al, 2021).TRIZ solves the problems based on contradictions matrix and general solutions, which were deduced by analyzing scientific innovations and patents. It is an effective approach to solve inventive problems in the field of mechanical design (Rau et al, 2023;Chang et al, 2023;Liao et al, 2021). Therefore, based on existing studies, a self-locking avoidance compliant mechanism was designed by using the contradiction matrix of TRIZ theory, and the compliant mechanism was optimized by orthogonal experiment.…”