金属挡栏是控制煤层突出强度,缩小波及范围,减小危害程度的措施之一,国内外已有应用。北票矿务局曾先后研究试验几种形式的金属挡栏,其中以柔性钢丝绳挡栏较为优越,它制作安装简便,易于在石门揭开突出煤层时推广使用。钢丝绳挡栏的安装及结构见图1和图2.在预揭煤层工作面前安设两道挡栏,每道挡栏由横竖各5道(?)16(或(?)20)的钢丝 Metal fence is to control the outstanding strength of the coal seam, reduce the scope of the spread, reduce the degree of harm to one of the measures, both at home and abroad have been applied. Beipiao Mining Bureau has successively studied and tested several forms of metal fence, of which the flexible wire fence is superior, which is easy to make and install, and is easy to popularize when it is used to open the outlying coal seam. Wire rope fence installation and structure shown in Figure 1 and Figure 2. Set in front of the seam exposed seam work barrier two, each fence by the horizontal and vertical 5 (?) 16 (or (?) 20) of the wire