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为进一步提高在复杂地层条件下的支护效果,保加利亚科技工作者在1979年研制了一种新型全长锚固的椭圆管式锚杆,已在保加利亚和其他国家取得专利,锚杆外形如图1所示。
In order to further improve the support effect under complex formation conditions, Bulgarian scientists developed a new full-length anchored oval tubular anchor in 1979, which has been patented in Bulgaria and other countries. The profile of the anchor is shown in Figure 1 As shown.