Method for blocking tail gate of diversion tunnel by adopting arc-shaped gate

Abstract

The invention discloses a method for blocking a tail gate of a diversion tunnel by adopting an arc-shaped gate. According to the method, a diversion tunnel (8) is provided; an opening and closing machine room (1) and an arc-shaped gate chamber (2) are excavated inside the diversion tunnel (8); the opening and closing machine room (1) is positioned above the arc-shaped gate chamber (2); a partition beam (1.2) is arranged between the opening and closing machine room (1) and the arc-shaped gate chamber (2); an arc-shaped gate (4) is mounted inside the arc-shaped gate chamber (2) and is positioned on a concrete structure body (7); the arc-shaped gate (4) rotates about an arc-shaped gate supporting and articulating rotation center (4.7) which is mounted on the concrete structure body (7). The method disclosed by the invention has the advantages of overcoming the defect that water easily flows in a cavity because of sudden changes of water flow boundary close to a gate slot in the prior art, safely and reliably blocking a dynamic water tail gate by utilizing the arc-shaped gate, being safe and realizing remarkable social benefits.

Description

technical field [0001] The invention relates to the technical field of diversion and sealing in water conservancy and hydropower engineering construction, and more specifically relates to a method for lowering and sealing a diversion tunnel by adopting an arc-shaped gate. Background technique [0002] At present, the diversion tunnel sealing technology at home and abroad: [0003] In the construction of high dams in alpine and canyon areas, the diversion method of cofferdam blocking the river bed and diversion tunnel discharge is usually used in the early stage of construction diversion, and the diversion method of temporary diversion bottom hole in the dam body and diversion tunnel on the bank is adopted in the later stage of diversion construction. stream mode. When the diversion tunnel is lowered and blocked, the water level of the reservoir gradually rises. Before the water level reaches the elevation of the high dam spillway hole (deep hole or medium hole), the water f...

AI Technical Summary

Problems solved by technology

Negative pressure zone is easy to form on the top of the rear opening of the gate, and it is necessary to add ventilation holes at the downstream lintel; the ventilation holes need to be blocked in the later stage, which increases the difficulty of construction

[0006] (3) The water retaining head H of the gate is high, and the planar gate needs to be supported by a slider when the gate is used as a blocking door. When the gate is moved underwater at a relatively high water head, due to the large frictional resistance of the slider, the hoist has a large capacity and is difficult to manufacture; High racks need to be arranged on the top of the tank, and it is difficult to install the hoist (refer to figure 2 shown)

[0007] (4) Due to the cavitation of the door slot and the negative pressure behind the door, the planar gate is prone to vibration during the opening and closing process, which may easily lead to safety accidents

An accident occurred when the flat gate of a certain domestic project was blocked when it was lowered, causing great losses

[0008] (5) The planar gate is prone to vibration during the opening and closing process, and it is not suitable to be opened locally for a long time, and the discharge flow cannot be controlled by controlling the gate opening, resulting in waste of water energy

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