| 摘要 |
The present invention relates to a manhole installed on a road, and more specifically, to a device for preventing falling into a manhole for a road when rainwater flows backwards which prevents a cover installed on a manhole from escaping from the manhole to open the manhole if rainwater flows backwards by heavy rain or localized heavy rain in a rainy season. An objective of the present invention is to prevent a person or an automobile from falling into a manhole by an escape of a manhole cover by a water pressure by a back flow of rainwater in heavy rain or localized heavy rain, and conveniently apply a device to a previously installed manhole. Accordingly, if rainwater flows backwards in a manhole by heavy rain or localized heavy rain, the present invention prevents a person or an automobile from falling into the manhole by a grating installed in a manhole main body even if a cover moves upwards by a water pressure to escape from the manhole main body. A structure is simple to facilitate manufacture. The device is simply installed on a previously installed manhole and used to secure safety when rainwater flows backwards. Also, the prevent invention can be sparsely added and installed on a previously installed manhole and used to facilitate work and install a safety device on an existing manhole at low costs. |
