A blocking procedure for the lower gate of a diversion tunnel group
A diversion tunnel and program technology, applied in water conservancy projects, buildings, hydroelectric power stations, etc., can solve the bias pressure of the septum pier, increase the risk of the entrance structure during the blockage period, and the safety risk of the water retaining structure of the diversion tunnel entrance structure is large and other issues, to achieve the effect of improving structural safety, improving the safety of imported structures, and improving the stress conditions of imported structures
Active Publication Date: 2020-09-18
CHANGJIANG SURVEY PLANNING DESIGN & RES
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[0005] (2) For projects with complex geological conditions at the entrance of the diversion tunnel, the diversion tunnel is blocked and operated at a high water head, and there is a certain safety risk in the structure of the diversion tunnel entrance
The diversion tunnel is a temporary project, and the geological conditions at the entrance of some projects are complex. When the water head is running, the safety risk of the water retaining structure at the entrance of the diversion tunnel is high
[0006] (3) For projects with multiple diversion tunnels, in order to reduce the amount of excavation and support work at the entrance of the diversion tunnel, the multiple diversion tunnels arranged on the same bank are generally arranged at staggered distances. For projects with complex geological conditions at the entrance, The staggered layout will lead to the problem of partial pier bias in the entrance section of the diversion tunnel during the closure period of the lower gate, which will increase the structural risk of the entrance during the closure period
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[0028] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, they are only examples, and at the same time, the advantages of the present invention will become clearer and easier to understand.
[0029] refer to Figure 1-3 Shown: a diversion tunnel group lower gate plugging procedure, it includes the following steps:
[0030] ①. Firstly, the first batch of diversion tunnels 1 are opened, and the second batch of diversion tunnels 2 that have not been opened are used to discharge the upstream water during the construction period. The small-capacity hoist 4 lowers the gate and lowers the water head to block the gate 3 to block the water, creating the first batch of diversion tunnels in the first dry land construction conditions; (the arrow in the figure indicates the direction of water flow)
[0031] 2. Carry out temporary plugging 6 constructi...
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The invention discloses a blocking procedure for the lower gates of a group of diversion tunnels, which comprises the following steps: first, the first batch of diversion tunnels are gated, and a small-capacity hoist is used to lower the gates and the low water head to block the gates to block water, so as to protect the temporary blockage during construction. The first batch of diversion tunnel permanent plugs in the water-retaining protection construction after the temporary plug is completed; The second batch of diversion tunnel permanent plugs will be constructed; when the construction of all diversion tunnel permanent plugs is completed and the water retaining conditions are met, the lower gates of the entire diversion tunnel group will be blocked. The invention can significantly reduce the water head and hoist capacity of the blocking gate of some diversion tunnels in the prior art, save engineering investment, and is beneficial to improve the safety and economy during the blocking of the lower gate of the diversion tunnel. There is an innovation in the blocking procedure of the lower gate of the diversion tunnel.
Description
technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, and more specifically relates to a procedure for closing gates of a group of diversion tunnels. Background technique [0002] In the construction of water conservancy and hydropower projects in mountainous rivers, the construction diversion scheme of cofferdams blocking the riverbed at one time and diversion tunnels for diversion is usually adopted during the construction period. For rivers with large runoff, two or more diversion tunnels are often arranged to form a group of diversion tunnels. After the diversion tunnel group completes the task of diversion and discharge, it must be blocked by lower gates to meet the requirements of water storage and power generation. After the diversion tunnel group is lowered, in order to meet the requirements of water discharge during the construction period, the diversion bottom hole, the middle hole of the dam body or th...
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IPC IPC(8): E02B9/02
CPCE02B9/02Y02E10/20
Inventor翁永红徐唐锦刘百兴范五一李蘅饶志文钱军祥漆祖芳
OwnerCHANGJIANG SURVEY PLANNING DESIGN & RES