Abstract: A manhole device and corresponding system including a manhole is described. The manhole device comprises a main body having an upper portion, a lower portion and a securing means. The securing means is engageable with the manhole such that when secured to the manhole, the upper portion protrudes above a surface level and the lower portion is retained below the surface level in the manhole. The main body provides means for alignment for construction around the manhole while providing a barrier to prevent access to vehicles, people and debris during the construction process. A method of construction is also provided.

Abstract: Joints between vertical shafts such as concrete manhole elements are sealed by an elastomeric ring and a rigid locating ring. The locating ring keys into the elastomeric ring and holds it in place during and (optionally) after assembly. The principle is applied to various types of joint and the locating ring may be extended to form a liner for the shaft.