Pressure releasing type box and manhole cover

Abstract

The invention provides a pressure release type foxbat or lid of manhole, comprising a lid of shape of approximate disc and lid frame of shape of approximate cylinder. The said lid consists of main body of lid; guide member approximately vertically extending from the inside of the main body; and locking component for restricting the main body moving up and down. The said lid frame comprises socket for holding the said lid; shell extending from the said socket to the inferior; and jut for clipping with the hook of the locking component of the lid below the socket at the inner circumference of the said shell. When loading the said lid, the said guiding component generates a preset clearance between the entirely or a part of the inner circumference of the said shell, and the said clipping surface of the hook is disposed to generate a preset distance apart from the periphery of the main body. Thus, the main body can move up and down between the said distance of the said socket and form peristome at the periphery of the said main body.

Description

technical field [0001] The present invention relates to a box bucket or a manhole cover composed of a cover body and a cover frame, which is installed on the ground opening of a drainage box bucket such as a synthetic resin sewage tank bucket or a rainwater bucket bucket buried in the ground. When the pressure is applied to the inside of the cover body, although the cover body is pushed up a predetermined distance from the socket and forms an opening for pressure release on its outer periphery, it does not come off from the socket and can be stored again in its original position. Covers for pressure relief bins or manholes at locations, and bins or manholes provided with such covers. Background technique [0002] It is well known that in the drainage facilities inside or outside the residential area, a drainage box is used to merge the main flow path and the branch flow path, and a box or manhole consisting of a cover body and a cover frame is installed on the opening above ...

AI Technical Summary

Problems solved by technology

[0004] But above-mentioned cover is after locking, because its cover body and cover frame are all tightly fixed, so under the situation that a large amount of rainwater such as concentrated rainstorm flows into drainage box bucket, can not discharge the excessive water that produces in the manhole. pressure, as a result, there is a problem of damage to the drain tank bucket or drain piping, or damage to the locking mechanism of the cover, causing the cover to jump up or fall off from the cover frame during use, thereby becoming dangerous

[0007] However, since the structure of the locking mechanism of the cover having the above-mentioned guiding function is complicated, it is difficult to apply it to a resin cover in practice. In addition, since sand, stones or dust are easy to intrude into the part that guides the cover body, it is difficult to use it for a long time. In the case of use, there is the following problem: the normal and stable function of guiding the up and down movement of the cover cannot be maintained.

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