| 摘要 |
This road manhole comprises a frame ( 4 ) which delimits an opening ( 6 ) and which is provided with an internal collar ( 8 ) which extends radially inwards, a cover ( 10 ) which comprises a blocking web ( 12 ) and a cylindrical skirt ( 14 ) which complements the internal collar ( 8 ), the blocking web and the skirt defining a concave corner ( 16 ), and a main gasket ( 18 ) which is arranged on the internal collar ( 8 ) and which is interposed in the closed state between the cover ( 10 ) and the frame ( 4 ). The road manhole ( 2 ) comprises an auxiliary gasket ( 20 ) which is in contact, at least in the closed state, with the concave corner ( 16 ).
|
