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锥销式锚具锚固的可靠与否,是否会产生滑丝、断丝、滑脱等现象,在很大程度上与锚具的形状尺寸、加工精度、材质和顶压措施有关。此外,更主要的是,在设计这种类型锚具时,锚具本身必须满足自锚和自锁的条件。自锚就是使预应力筋可靠地锚固,不致产生滑移现象。自锁就是使锚塞在项压后不致弹回脱出。以下就锥锚式锚具的锚固原理、性能及受力情况进行分析。一、锚具的自锁如图1所示,设锚具的圆锥角为2a,锚塞在顶压力Q作用下均匀压入锚圈内。由于Q力的作用,在锚塞侧面产生正应力N_Q及摩阻力μ_1N_Q(u_1为钢
Whether or not the anchorage of the taper-pin anchor is reliable or not will produce slipping wire, broken wire, slippage, etc., and is largely related to the shape and size of the anchorage, processing accuracy, material and pressing pressure measures. In addition, more importantly, in designing this type of anchorage, the anchorage itself must satisfy self-anchor and self-locking conditions. The self-anchor is to reliably anchor the prestressed tendons without causing slippage. Self-locking means that the anchor does not spring back out after the item pressure. The following is an analysis of the anchoring principle, performance and force conditions of anchor anchors. First, the self-locking of the anchorage As shown in Fig. 1, the anchorage cone angle is 2a, and the anchor plug is evenly pressed into the anchoring circle under the action of the top pressure Q. Due to the effect of Q-force, normal stress N_Q and frictional resistance μ_1N_Q are generated on the side of the anchor plug (u_1 is steel