A variable sliding manhole safety guard comprising:
- an installation support part (110) that is installed on an inner wall of a manhole (100) to be installed and has a rail structure vertically extending by a predetermined length and configured to change a vertical position of a movement guide (120);
- the movement guide (120) that is mounted on the rail structure to change a vertical position, has a structure vertically extending by a predetermined height, and is mounted on a safety fence (130) in an integrated structure;
- the safety fence (130) which is mounted on the movement guide (120) in an integrated structure and includes a plurality of frames forming a cylindrical structure having an outer diameter corresponding to an inner diameter of a manhole entrance, and in which an openable entrance door (160) is installed in an upper one surface thereof;
- a safety fence position fixing part (140) which is mounted on an upper portion of the safety fence (130) so that a stopping lever (141) performs a rotational operation and in which a stopping member (142) configured to fix a vertical height of the movement guide (120) by the rotational operation of the stopping lever (141) is mounted at a lower end thereof;
- and
- a ladder (150) that is adjacent to the installation support part (110), is installed on the inner wall of the manhole, and has a structure extending from the manhole entrance to an inside of the manhole by a predetermined length,
- wherein the installation support part (110) includes:
- a side wall installation plate (111) that has a plate-shaped structure in which a curved structure corresponding to the inner wall of the manhole is formed and has a rectangular plate-shaped structure entering the manhole from the manhole entrance by a predetermined length;
- an upper end fixing plate (112) that protrudes laterally from an upper end of the side wall installation plate (111) by a predetermined length and is bound to an upper end of a rail pipe;
- a lower portion fixing plate (113) that protrudes laterally from a lower end of the side wall installation plate (111) by a predetermined length and is bound to an outer circumferential surface of a lower portion of the rail pipe;
- and
- a rail formation portion (114) that is mounted by the upper end fixing plate (112) and the lower portion fixing plate (113) and has a hollow pipe structure extending from the manhole entrance to the inside of the manhole by a predetermined length, and
- the movement guide (120) includes:
- a vertical extension portion (121) that has a pipe structure having the same outer diameter as an inner circumferential surface of the rail formation portion (114), has a structure vertically extending by a predetermined length, and is bound to an upper end of the safety fence (130) at an upper end thereof in an integrated structure;
- an upper end guide plate (122) that is mounted at an upper end of the vertical extension portion (121), has a plate-shaped structure bound to the upper end of the safety fence (130) in an integrated structure, and rotatably fixes an upper end of the safety fence position fixing part (140);
- and
- a lower end guide plate (123) that is mounted at a lower end of the vertical extension portion (121), has a plate-shaped structure bound to a lower end of the safety fence (130) in an integrated structure, and rotatably fixes a lower end of the safety fence position fixing part (140).