| 摘要 |
A height adjustable ladder for manhole for waterworks is provided to enter and leave the inside/outside of a manhole by taking out a manhole ladder above the ground after opening a manhole cover and adjusting the height according to the physical conditions of a worker. A height adjustable ladder(100) for a manhole for waterworks is formed in the corresponding shape to a manhole ladder installed to the inside of a manhole, and provided with many height adjustable fixtures(112) projected to one part to adjust the height exposed to the ground when entering and leaving the inside/outside of a manhole, wherein the height adjustable fixture is formed to be inserted and fixed to a step provided to the manhole ladder, and provided with a hanging groove opened toward the step of the manhole ladder. When a worker enters the inside/outside of the manhole for maintaining or managing electric wires, communication cables or various underground pipes, the height-adjustable ladder is exposed to the ground and adjusted in height according to the physical conditions of the worker, and coupled by inserting the hanging groove of the fixture to the step provided to the top of the manhole ladder installed to the internal wall of the manhole. |
