Overhead maintenance passage for diversion tunnels

Abstract

The invention discloses an overhead maintenance passage for a plurality of diversion tunnels, which can reduce the construction cost. The maintenance passage comprises an un-blocked construction tunnel forming an external maintenance adit, and further comprises an upper maintenance branch adit, wherein the upper maintenance branch is higher than the external maintenance adit, communicated with the external maintenance adit through an external maintenance well, and communicated with the diversion tunnels through internal maintenance wells. The maintenance passage can drain ponded water without the need of a dedicated drain hole, which greatly reduces the construction cost; as the number of maintenance blocking doors is greatly reduced, the construction cost is greatly reduced, the construction difficulty is reduced, and the maintenance operation is more convenient; moreover, when one of the diversion tunnels is maintained, the normal operation of the other diversion tunnels cannot be impacted. Therefore, the overhead maintenance passage is suitable to be popularized and applied in the field of diversion power generation systems.

Description

technical field [0001] The invention relates to the field of water diversion power generation systems, in particular to an upper-span maintenance channel for multiple diversion tunnels. Background technique [0002] In water conservancy and hydropower projects, in order to increase the amount of water diversion, a plurality of diversion tunnels arranged in parallel are usually used for water diversion. After the diversion tunnels have been in operation for a period of time, the diversion tunnels must be overhauled to ensure the normal use of the diversion tunnels. , the maintenance personnel enter the diversion tunnel from the maintenance channel to perform maintenance on the diversion tunnel. At present, the maintenance channels used for multiple diversion tunnels usually adopt the following two arrangements: [0003] The first way is to directly use the construction tunnel formed during the excavation of the diversion tunnel, and set a plugging and maintenance door at the ...

AI Technical Summary

Problems solved by technology

[0003] The first way is to directly use the construction tunnel formed during the excavation of the diversion tunnel, and set a plugging and maintenance door at the connection between the construction tunnel and the diversion tunnel to close the diversion tunnel. Although this arrangement does not require additional maintenance support tunnels, The number of plugging and inspection doors required is large, and plugging and inspection doors need to be installed on both sides of each diversion tunnel. However, the design and manufacture of the plugging and inspection doors are difficult and costly, and they are located on the inner side of the mountain for maintenance During the diversion tunnel, it is necessary to empty the diversion tunnel on the outside of the backing, and open the plugging inspection door on the outside of the backing, which is very inconvenient for maintenance. In addition, during the operation of the diversion tunnel, due to the seepage of water in the diversion tunnel or groundwater, the construction tunnel accumulates Water, the accumulated water in the construction tunnel between the two diversion tunnels cannot be discharged. When the plugging maintenance door is opened, the accumulated water in the construction tunnel between the two diversion tunnels gushes out, causing great damage to the maintenance work. the inconvenience

[0004] The second method is to set up a maintenance branch tunnel under the diversion tunnel. The maintenance branch tunnel is connected to the diversion tunnel through an internal maintenance shaft or inclined shaft, and a plugging maintenance door is set at the connection between the internal maintenance inclined shaft or vertical shaft and the diversion tunnel to control the diversion tunnel. It is closed, and there is also a drainage hole connected to the outside world on the maintenance branch tunnel. Although this arrangement reduces the number of blocked maintenance doors, since the maintenance branch tunnel is located under the water diversion tunnel, during the operation of the water diversion tunnel, due to water diversion Water seepage or groundwater in the tunnel will cause water accumulation in the maintenance branch tunnel, and drainage tunnels need to be added, and the construction cost of drainage tunnels is high, which makes the construction cost of the entire maintenance channel relatively high

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