| 摘要 |
PURPOSE: A coupling device for a prefabricated manhole is provided to prevent spherical members from being separated even if external force is applied and to reduce assembling time in a construction site. CONSTITUTION: A coupling device for a prefabricated manhole comprises spherical members(6,8,4). Fastening passages(12) are formed in contact parts of the spherical members. Multiple coupling grooves(10) are arranged in the contact parts of the spherical members. Fixtures are formed on the bottom surface of inner fastening spaces(10a) of the fastening passages. Connection members are formed in the fastening passages when the spherical members are laminated. |
