Manhole device

1. A manhole device, comprising:

a single-piece main body comprising an upper portion, a lower portion and a securing means;

wherein:

said securing means is engageable with a manhole to secure said single-piece main body in said manhole, such that, when secured to said manhole, said upper portion protrudes above a surface level and said lower portion is retained below said surface level in said manhole,

said single-piece main body is configured to provide alignment means to maintain a diameter or dimension of an opening of said manhole, said opening providing access to an underground vault,

said single-piece main body is further configured to position and align construction materials around said manhole,

said single-piece main body further comprises an outer wall defining an internal space and a top surface, said top surface extending from an edge of said outer wall to cover said internal space, said top surface thereby preventing access into said internal space and providing a barrier so as to prevent access to said manhole during construction, and

said single-piece main body comprises at least one slot in said outer wall; and

a grating device comprising at least one support bracket for being received into said at least one slot, wherein at least part of said upper portion is removable to provide access for said grating device.

2. A manhole device according to claim 1 , wherein said outer wall comprises a ribbed outer surface.

3. A manhole device according to claim 1 , wherein said top surface comprises a ventilation hole to allow ventilation to said manhole when fitted.

4. A manhole device according to claim 1 , wherein said top surface comprises a cavity.

5. A manhole device according to claim 1 , wherein said single-piece main body further comprises an open end in said lower portion.

6. A manhole device according to claim 1 , wherein said securing means comprises a tab at an interface between said upper portion and said lower portion, said tab thereby preventing said upper portion from entering said manhole.

7. A manhole device according to claim 1 , wherein said securing means comprises a tapered wedge configured to interfere with an inner surface of said manhole so as to hold said manhole device in position.

8. A manhole device according to claim 1 , wherein said single-piece main body comprises a smooth internal surface.

9. A manhole device according to claim 1 , wherein said upper portion comprises a visual indicator to improve visibility of said upper portion.

10. A manhole system comprising a manhole and a manhole device, said manhole device comprising:

a single-piece main body comprising an upper portion and a lower portion, said single-piece main body being positioned in said manhole; wherein:

said upper portion protrudes above a surface level,

said lower portion comprises a securing means configured to retain said lower portion below said surface level and in said manhole,

said single-piece main body provides alignment means to maintain a diameter or dimension of an opening of said manhole, said opening providing access to an underground vault,

said single-piece main body being further configured to position and align construction materials around said manhole,

said single-piece main body further comprises an outer wall defining an internal space and a top surface, said top surface extending from an edge of said outer wall to cover said internal space, said top surface thereby preventing access into said internal space and providing a barrier so as to prevent access to said manhole during construction, and

said single-piece main body comprises at least one slot in said outer wall; and

a grating device comprising at least one support bracket for being received into said at least one slot, wherein at least part of said upper portion is removable to provide access for said grating device.

11. A manhole system according to claim 10 , wherein at least part of said upper portion is removable from said lower portion to provide access to said manhole from a ground surface.

12. A method of constructing a manhole, comprising the steps of:

obtaining a manhole device having a single-piece main body comprising an upper portion, a lower portion and a securing means, wherein at least part of said upper portion is removable to provide access for a grating device;

positioning said manhole device in said manhole such that said upper portion protrudes above a surface level and said lower portion is retained below said surface level in said manhole;

engaging said securing means with said manhole to secure said manhole device in position;

providing an alignment means to maintain a diameter or dimension of an opening of said manhole, said opening providing access to an underground vault, and said single-piece main body being further configured to position and align construction materials around said manhole by means of said single-piece main body;

preventing access to said manhole during construction by providing a barrier by means of an outer wall defining an internal space and a top surface, said top surface extending from an edge of said outer wall to cover said internal space, said top surface thereby preventing access into said internal space of said single-piece main body; and

disposing at least one support bracket of said grating device in at least one slot in said outer wall.

13. A method of constructing a manhole according to claim 12 , further comprising the step of:

removing said at least part of said upper portion of said manhole device to provide access to said manhole from a ground surface.

14. A method of constructing a manhole according to claim 12 , wherein said step of providing an alignment means comprises:

aligning a plurality of seating rings or bricks around said manhole device.

15. A method of constructing a manhole according to claim 12 , further comprising the step of:

providing an indication of required height of a final surface by means of said protruding upper portion.