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这种桁架锚杆由一些受拉杆件组成,它通过在顶板中产生向上的推力来控制顶板。锚杆的一端位于煤墙的上方,将它的垂直分力传递给煤墙。有些矿井在巷道顶板每排只安装四个不闭合的普通垂直锚杆,把桁架锚杆作为控制顶板的辅助支架。因为这种闭合桁架锚杆的两个斜锚杆安装速度较慢,影响生产,故快速掘进的巷道一般不愿用它。为此,研制了一种带有斜头的锚杆机,这种斜头能在极短的时间里从垂直方向转换成倾斜方向。简矿在不同地段试验了几种锚杆机,并在大范围内试用。经过研究认为英格索尔—兰德 T D——12型双臂锚杆
This truss bolt consists of tension members that control the roof by generating upward thrust in the roof. One end of the bolt is above the coal wall and transmits its vertical component to the coal wall. Some mines install only four vertical vertical bolts that are not closed in each row of the roof of the roadway, and the truss bolts serve as the auxiliary support for controlling the roof. Because of this closed truss anchor two inclined anchor installation speed is slow, affecting production, so fast driving tunnels are generally not willing to use it. For this reason, a kind of bolt machine with inclined head was developed, which can be changed from vertical direction to oblique direction in a very short period of time. Several types of bolting machines were tested at different locations in the simple mines and tried on a large scale. After research that Ingersoll - Rand T D - 12 double arm bolt