| 摘要 |
A multistage assembly-type locking manhole is provided to improve the dislocated combining efficiency of the combining protrusions of the connection anchor by forming the opening grooves at the socket end protrusions with a regular interval and exposing the combining protrusions to the outside. A multistage assembly-type locking manhole combined with lower, center, and upper manholes by uneven socket end protrusions(100,200) is composed of a combining protrusion(310) of a connection anchor(300) embedded in slabs of the socket end protrusions of one side of the manholes to be exposed to the outside; and opening grooves(230) whose protrusions are opened to the socket end protrusions of the other side of the manhole. The combining protrusions of the connection anchor embedded in the slabs are exposed to the opening groove. The combining protrusions are exposed with Gamma-shapes. |
