The bolt improves the stability of the surrounding rock. The reinforcement effect of the long bolt is better than that of the short bolt.

锚杆使得围岩的稳定性大大提高，且长锚杆的支护效果要优于短锚杆。

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Secondly, the design of two typical joint of the mega frame, the joint of outrigger to super-column and the long bolt joint of the belt truss, were checked.

介绍了基于性能的节点设计原则，研究了伸臂桁架与巨型柱连接节点、环带桁架螺栓拼接节点两类典型节点。

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Secondly, the design of two typical joint of the mega frame, the joint of outrigger to super-column and the long bolt joint of the belt truss, were checked.

介绍了基于性能的节点设计原则，研究了伸臂桁架与巨型柱连接节点、环带桁架螺栓拼接节点两类典型节点。

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