JPH0649624Y2 - Frame for manhole - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a manhole receiving frame to which a manhole cover can be attached in an openable and closable manner. More specifically, a manhole in which a straight wall pipe and a slant wall pipe having a step at a predetermined position are sequentially stacked. In the receiving frame attached to the upper end of, the part of the standing inner peripheral wall surface continuing to the lower end opening is formed into a vertical wall surface,
Further, the present invention relates to a manhole receiving frame characterized in that another standing inner peripheral wall surface surrounding the vertical wall surface is gradually inclined to form an inclined wall surface to form an eccentric frame.

A conventional receiving frame 1 of this type is constructed so as to incline inwardly as the whole goes up, as shown in FIG. 1, for example, but when the conventional receiving frame 1 is used. As described above, since the upper portion is inclined inward and the lid receiving portion 2 is projected inward, when the worker uses the step 3 to move up and down the manhole 4, the inclined surface of the receiving frame 1 and the lid are closed. There was a drawback that the receiving part 2 was an obstacle and had to move up and down with the body tilted.

Further, when a large-diameter receiving frame is used to improve this drawback, there are drawbacks such that the weight of the receiving frame is significantly increased and the cost is increased.

The present invention is a technology developed in view of the drawbacks of the prior art, in particular, a part of the standing inner peripheral wall surface is made into a vertical wall surface, and the surrounding standing inner peripheral wall surface is gradually inclined to form an inclined wall surface. The present invention relates to a manhole receiving frame, which is characterized by an eccentric frame as a whole. An embodiment of the receiving frame according to the present invention will be described in detail with reference to the drawings. In FIGS. 2 to 4, 5 is the receiving frame according to the present invention, and the inner peripheral surface of the lower end opening 6 is a manhole. 4 is formed to have the same diameter as the inner peripheral surface of the upper end opening of 4, and a part of the standing inner peripheral wall surface following the opening 6 is formed as a vertical wall surface 7. The other standing inner peripheral wall surface is gradually inclined to be formed as an inclined wall surface 8 having a substantially uniform wall thickness with a large inclination angle, and is configured as an eccentric frame as a whole. As described above, in the receiving frame according to the present invention, the diameter of the inner peripheral surface of the lower end opening is made equal to the diameter of the inner peripheral surface of the upper end opening of the manhole, and a part of the standing inner peripheral wall surface continuing to the lower end opening is formed. Since the vertical wall surface and the other standing inner peripheral wall surfaces following it are gradually inclined to form the inclined wall surface as a whole as an eccentric frame,
As shown in the drawing, the receiving frame 5 is integrally attached to the manhole 4, so that the space of the lower end opening 6 of the receiving frame 5 and the upper end opening of the manhole 4 can be effectively used, and the vertical wall surface 7 of the receiving frame 5 can be used.
When the receiving frame 5 is attached to the manhole 4 so that the position of the receiving frame 5 corresponds to the step 3 of the manhole 4, the vertical wall surface 7 of the receiving frame 5 and the inner peripheral wall surface of the manhole 4 are flush with each other. There is no need to tilt the body when moving up and down this part in order to move in and out of the manhole 4, and it is possible to move up and down while keeping the body vertical, which makes it easy to move in and out of the manhole and the scaffolding It has features such as safety.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional receiving frame, and FIGS. 2 to 4 are explanatory diagrams of the receiving frame of the present application. Reference numeral 1 is a conventional receiving frame, 3 is a step, 4 is a manhole, 5 is a receiving frame of the present application, 7 is a vertical wall surface, and 8 is an inclined wall surface.

Claims (1)

[Scope of utility model registration request] 1. A receiving frame attached to the upper end of a manhole in which straight wall pipes, sloping wall pipes, etc., each having a step at a predetermined position are sequentially stacked. The eccentric frame is formed by forming the inclined wall surface 8 having a substantially uniform thickness by forming it on the vertical wall surface 7 and by sloping the other standing inner peripheral wall surface and the outer peripheral wall surface surrounding the vertical wall surface 7 at the same inclination. A manhole receiving frame characterized by being configured.