Double-layer well lid device with disengagement, displacement and falling down preventing functions

Abstract

The invention belongs to well lid devices for blind shafts of underground pipes, trenches, lines and the like, and discloses a double-layer well lid device with disengagement, displacement and falling down preventing functions. The double-layer well lid device is composed of a well lid body, a lid base, a lower layer well lid body and a lower layer lid base. A plurality of claws are arranged at the lower portion of the well lid body. A spigot of the lid base is provided with multiple notches opposite to the claws. The claws and the notches are arranged at different intervals. The well lid is rotated, and the claws are rotated to the position below the spigot of the lid base, so that the well lid and the lid base are not prone to moving. Because the claws and the notches are arranged at different intervals, the claws disengage from the notches by rotating the well lid, the well lid cannot be opened until all the claws reset, and even when only one claw is opposite to the corresponding notch, the well lid can not be opened. The more the claws and the notches which are arranged at different intervals are, the higher the disengagement prevention property is, and the well lid device is like a coded lock so as to achieve the disengagement prevention effect. The lower layer well lid body and the lower layer lid base are arranged for avoiding the situation that pedestrians fall into a well and casualty accidents are caused when an upper layer well lid is disengaged or damaged. The double-layer well lid device has good functions of preventing disengagement, displacement and falling down.

Description

technical field [0001] The device belongs to a well cover device for underground pipelines, ditches, lines and other underground wells. Background technique [0002] The circular well cover devices used for underground wells such as existing pipelines, ditches, and lines are mostly composed of well covers and cover seats. Because the well cover is only placed on the stop of the cover seat, the well cover is often displaced or lost due to various reasons, so that pedestrians accidentally fall into the well and cause casualties. The 94235930.5 position difference self-locking manhole cover device disclosed by the Chinese Patent Office solves the problems of preventing displacement and loss of the manhole cover, but once the secret of the position difference self-locking is deciphered and the manhole cover is stolen or accidentally damaged, it will also cause similar problems. Accidents; In order to avoid similar accidents, the double-layer manhole cover disclosed in the book ...

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Problems solved by technology

The 94235930.5 position difference self-locking manhole cover device disclosed by the Chinese Patent Office solves the problem of preventing displacement and loss of the manhole cover, but once the secret of the position difference self-locking is deciphered and the manhole cover is stolen or accidentally damaged, it will also cause similar problems. Accidents; in order to avoid similar accidents, the double-layer manhole cover disclosed in the book "Single-layer, Double-layer Manhole Covers and Steps" designed and published by the China Building Standard Design Institute solved the problem of preventing pedestrians from falling due to the loss or damage of the manhole cover. However, the problems of anti-displacement and anti-lost have not been solved

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