公开(公告)号：US5064311A

公开(公告)日：1991-11-12

申请号：US504608

申请日：1990-04-05

Applicant: Roger Giroux ,  Raymond L. Wright

Inventor： Roger Giroux ,  Raymond L. Wright

IPC: E21D21/00

CPC classification number: E21D21/0093

Abstract: An assembly and methods of installation thereof for supporting and stabilizing a rock structure adjacent a mine tunnel or other underground passageway. The assembly includes an elongated bolt, threaded from both ends for at least a portion of its length. A conventional, mechanical expansion anchor is threaded on one end of the bolt, within a drill hole in the rock structure, and a bearing plate, washer, jam nut and tensioning nut are carried on the other end, outside the drill hole. The tensioning nut is threaded into firm engagement with the jam nut to prevent further threaded advance of the tensioning nut a substantial distance from the termination of the threads. A torque applied to the tensioning nut thus rotates the bolt and expands the anchor shell into gripping engagement with the bore hole wall; torque producing an axial load on the jam nut in excess of its strength causes it to fracture or strip from threaded engagement with the bolt, permitting travel of the tensioning nut. The jam nut is received in a recess in the lower surface of the washer, which is preferably spherical on its upper surface.

Abstract translation: 一种用于支撑和稳定靠近矿井隧道或其他地下通道的岩石结构的组件及其安装方法。 该组件包括细长的螺栓，其从两端螺纹连接至其长度的至少一部分。 常规的机械膨胀锚杆在岩石结构的钻孔内螺纹连接在螺栓的一端，另一端承载板，垫圈，锁紧螺母和张紧螺母在钻孔的外侧。 张紧螺母与止动螺母拧紧牢固接合，以防止紧固螺母与螺纹终端相距很远的距离。 施加到张紧螺母的扭矩因此使螺栓旋转并将锚壳膨胀成与钻孔壁夹紧接合; 在果酱螺母上产生超过其强度的轴向负载的扭矩导致其与螺栓的螺纹接合断裂或剥离，从而允许张紧螺母的行进。 锁紧螺母被容纳在垫圈的下表面的凹部中，其优选地在其上表面是球形的。