| 摘要 |
<p>A derrick comprises equipment (41) for movement of a pipe line/drill stem (13) or a pipe section (29) axially in the derrick (12), and equipment (65) for turning of same about its longitudinal axis, together with equipment (31) for installing pipe sections (29) in the derrick (12) and withdrawal of pipe sections (29) from the derrick (12). The equipment comprises an aggregate (41) of axially extendible/contractible hydraulic cylinders (42a-42c, 43a-43c, 44a-44c), which are arranged in groups (42, 43, 44) in the aggregate (41) in two or more vertical rows, with an intermediate vertical guide for the pipe line/drill stem (13) or for the pipe section (29). The rows of cylinders are mutually rigidly connected via bridge portions (45', 45'', 45'''), which separately form a fastening for at least one end of a group of cylinders. Each bridge portion is provided with a laterally opening recess (46) for sideways installation/withdrawal of a pipe section (29) in the guide between the rows of cylinders.</p> |
