Tail lock sealing arrangement and method adopting combination of independently-arranged temporary plug heads and gates, for diversion tunnels

Abstract

The invention discloses tail lock sealing arrangement and method adopting combination of independently-arranged temporary plug heads and gates, for diversion tunnels. The tail lock sealing arrangementcomprises a plurality of the diversion tunnels (9) forming a diversion tunnel group, the diversion tunnel group is divided into two batches for tail lock, and each of the diversion tunnels (9) subjected to the first-batch tail lock comprises a diversion tunnel inlet section (1) and a diversion tunnel body (1.1); a low-water-head sealing gate (3) is arranged on each diversion tunnel inlet section(1), an intake tower (2) is arranged on the diversion tunnel inlet section (1), and a small-capacity hoist (4) is installed at the top of the intake tower (2); and one temporary plug head (7) is arranged on the upstream section of each diversion tunnel body (1.1), and a permanent plug head (8) is arranged at the downstream side of the temporary plug head (7). The tail lock sealing arrangement andmethod overcome the defects of high water retaining water heads of sealing gates for diversion tunnels, high capacities of hoists and high project investment in the prior art, and have the advantage of innovating the existing tail lock sealing technology for diversion tunnels.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower, and more specifically relates to a single temporary plug in a diversion tunnel combined with a lower sluice closure arrangement and method. Background technique [0002] In the construction of hydropower projects in mountainous rivers, the construction diversion scheme of cofferdams blocking the riverbed at one time and diversion tunnels for diversion is often used 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 ...

AI Technical Summary

Problems solved by technology

[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

Images