| 摘要 |
Provided is a streetlight having a function of preventing rotation of an internal expansion type arm supporting pipe. In the present invention, an upper connection pipe having a diameter smaller than an inner diameter of a pillar is partially accommodated and fixed within the support in a lower portion of a streetlight. An arm protrudes in a lateral direction from an outer side of an arm supporting pipe coupled to the pillar such that the arm supporting pipe accommodates the protruded upper connection pipe. A rotation preventing pipe having an irregular coupling portion in a depressed form is accommodated and fixed within the arm supporting pipe. The irregular coupling portion of the rotation preventing pipe and an irregular coupling portion protruding from the upper connection pipe are engaged to prevent rotation of the arm supporting pipe. A pressing jig, which includes a guide block having guide wings protruding from both sides thereof and pressing blocks each including wing accommodation recesses formed on both sides of the guide block to accommodate the guide wings and having sloped surfaces protruding from an outer side thereof, is provided within a case welded to an interior of the upper connection pipe. When fastening is performed using a fixing bolt, the pressing blocks are opened and the sloped surfaces formed in the pressing blocks slide along sloped recesses formed in the rotation preventing pipe to downwardly press and firmly fix the arm supporting pipe. |
