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         der screw. In some embodiments, fastener 150 may include
         a fastener body 156 and a fastener head 154. In addition, an
         axial retainer 152 may be located around fastener body 156.
         In some embodiments, axial retainer 152 is a circular disc
         extending from fastener body 156. Axial retainer 152 may
         be fixed to fastener body 156. In other embodiments, axial
         retainer 152 is a snap ring coupled to a retainer groove 158
         of fastener body 156 (see figure 22).
           Fastener head  154 may be located at one end of fastener
         body 156, and axial retainer 152 may be offset a certain dis-
         tance from fastener head 154. Fastener head 154 may be lo-
         cated within a fastener head slot 310 of first wedge 300 and
         a fastener head slot 410 of second wedge 400. Fastener head
         slots 310 and 410 may each be a semicircular slot located at
         one end of first wedge 300 and second wedge 400, respectively.
         Furthermore, fastener body 156 may extend within a fastener
         groove 308 of first wedge 300 and a fastener groove 408 of sec-

                                                              Figure 22: Detailed view of a portion of an alternative embodiment of
                                                              a wedge assembly.
                                                              have similar diameters as fastener head slots 310 and 410, re-
                                                              spectively. In some embodiments, axial retainer slots 312 and
                                                              412 are snap ring slots (see figure 22).
                                                               In some embodiments, fastener head 154 is enclosed by
                                                              fastener head slots 310 and 410, and axial retainer 152 is
                                                              enclosed by axial retainer slots 312 and 412. In some em-
                                                              bodiments, fastener head slots  310 and  410 and axial re-
                                                              tainer slots 312 and 412 may act as barriers to movement of
         Figure 20: Cross sectional view of the wedge assembly.  fastener 150. For example, the walls of axial retainer slots
                                                              312 and 412 may prevent movement of axial retainer 152 in
         ond wedge 400. The fastener grooves 308 and 408 may be cir-  the direction of arrows 112 and 114. As such, fastener 150
         cular grooves extending from fastener head slots 310 and 410,   may be fixed to first wedge 300 and second wedge 400.
         respectively.  Fastener  grooves  308  and  408  may  each  have
         lesser diameters compared to fastener head slots 310 and 410,   Tensioning device and tensioning method for steel
         respectively. Axial retainer 152 may be located within an axial   wire rope of cage guide of ultra-deep vertical shaft
         retainer slot 312 of first wedge 300 and an axial retainer slot   Pat. 9,708,160 U.S. class B66B 7/02 Int. class B66B 7/02
         412 of second wedge 400. Axial retainer slots 312 and 412 may   Inventor:  Zhencai  Zhu,  Xuzhou,  CN.,  Xiao  Chen,  Xuzhou,
         each be a circular slot extending from fastener grooves 308 and   CN.,  Guohua  Cao,  Xuzhou,  CN.,  Hong  Lai,  Xuzhou,  CN.,
         408, respectively. Axial retainer slots 312 and 412 may each   Wenxiang  Teng,  Xuzhou,  CN.,  Gang  Shen,  Xuzhou,  CN.,
                                                              Gongbo Zhou, Xuzhou, CN., Li, Xuzhou, CN.
                                                              Assignee: CHINA UNIVERSITY OF MINING AND TECH-
                                                              NOLOGY, Xuzhou, Jiangsu, CN.
                                                               This  patent presents  a tensioning  device and a tension-
                                                              ing method for a steel wire rope of a cage guide of an ultra-
                                                              deep vertical shaft. The tensioning device comprises an up-
                                                              per rope clamping device, a rope adjustment guide frame, a
                                                              lower hydraulic rope locking device, and a lower hydraulic
                                                              rope adjustment device. The upper rope clamping device
                                                              is provided with a rope clamp and a pressure sensor. The
                                                              rope adjustment guide frame comprises a steel frame body,
                                                              double fixed clamp-plates, a balance weight, and a balance
                                                              weight steel wire rope. Double moving clamp-plates are dis-
                                                              posed in a guide groove of the steel frame body. The double
                                                              moving clamp-plates are provided with a rope clamp and a
                                                              lower guide pulley. The double fixed clamp-plates are pro-
                                                              vided with an upper guide pulley. The balance weight is pro-
                                                              vided with a fastening joint. Each of the upper rope clamp-
                                                              ing device, the lower hydraulic rope locking device and the
                                                              lower hydraulic rope adjustment device comprises a wedged
                                                              iron block and a shim. Each of the lower hydraulic rope lock-
                                                              ing device and the lower hydraulic rope adjustment device
                                                              further comprises a lever wedge adjustment mechanism and
                                                              a wedge adjustment hydraulic cylinder. A wedge adjustment
         Figure 21: Side view of the wedge assembly.          hydraulic pressing rod is connected to the wedged iron block.

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