Diversion channel closure advancing dike of upstream cofferdam arranged on river channel

Abstract

The invention discloses a diversion channel closure dike advancing method of an upstream cofferdam arranged on a river channel, which is mainly formed by a pre-advancing dike, an advancing dike, a closure gap dike and a pre-advancing wrapping head, the whole axis of a closure dike is a broken line, wherein the axis of the pre-advancing dike is intersected with that of an advancing dike, the axes of the pre-advancing dike, a closing dike and the pre-advancing wrapping head are intersected with each other, the starting point A of the pre-advancing dike is selected at the inside river bank of anopen channel, the starting point C of the pre-advancing wrapping head is selected between an overflowing gap and a diversion channel of an upstream cofferdam on the river channel, the crossing point B' of the axes of the pre-advancing dike and the advancing dike is positioned inside the river bank, the distance form B' to the starting point B of the inlet of the outside of the diversion channel is B0 which can lead the flow rate of the corresponding closure gap to be less than 2.5m / s, and the included angle theta between the connecting line direction of B B' and the channel thread direction is controlled within 15-90 degrees. Compared with the traditional closure dike, the invention can effectively reduce various hydraulic indexes of river closure and obviously reduce the open channel closure difficulty.

Description

technical field [0001] The invention relates to diversion open channel interception technology in water conservancy and hydropower projects, and more specifically relates to a diversion dike for diversion open channel closure in which the upstream cofferdam has not been completely dismantled and the cofferdam is provided with an overflow gap. Background technique [0002] The closure of diversion open channels is an important part of water conservancy and hydropower engineering construction. Compared with the closure of the main riverbed of the river, since the closure of the diversion open channel is carried out on the concrete channel bottom, it is difficult for the interception and throwing materials to stand firmly on the concrete channel bottom, and the stability of the throwing materials is low, resulting in a large loss of throwing materials , in the difficult stage of closure, the amount of large material is more, and the safety of closure is relatively low. In the ...

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Problems solved by technology

[0004] In view of the existing existing cofferdams in the upper reaches of the river, and the deficiencies in the diversion open channels with diversion gaps in the cofferdams, the purpose of the present invention is to propose a new diversion method that still exists in the upstream cofferdams of the river. The open channel closure enters the embankment to solve many problems such as poor stability of throwing and feeding, large loss of throwing and feeding, large amount of large material consumption and high closure index in the diversion open channel closure

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