Open division channel closure advancing banquette for removing cofferdam in upstream of riverway

Abstract

The invention discloses an open division channel closure advancing banquette for removing a cofferdam in the upstream of a riverway, which mainly comprises a pre-advancing banquette, an advancing banquette, a closure banquette and a pre-advancing warped head. The entire axis of the closure banquette is a broken line, the axis of the pre-advancing banquette and the axis of the advancing banquette intersect, the axis of the advancing banquette and the axis of a closure gap banquette intersect, and the axis of the closure gap banquette and the axis of the pre-advancing warped head are connected. The starting point A of the advancing banquette is selected to be at the river bank on the inner side of an open channel, and the pre-advancing warped head is selected to be at the river bank on the outer side of the open channel. The intersecting point B' of the axis of the pre-advancing banquette and the axis of the advancing banquette is located in the riverway, the distance B0 between B' and the starting point B of an entry of the outer side of the open division channel enables the flow rate of a corresponding closure gap to be smaller than 2.5 m / s by controlling the included angle theta between the connecting line direction of B and B' and the main stream direction of the river to be within the range of 15 DEG to 90 DEG, and the length L of the advancing banquette enables the average flow rate of closure gap water stream to be smaller than 5.5 m / s during banquette closure. Compared with the traditional closure banquette, the invention can effectively reduce various hydraulics indexes of closure construction and obviously lower the difficulty of open channel closure.

Description

technical field [0001] The invention relates to diversion open channel closure technology in water conservancy and hydropower projects, and more specifically relates to a diversion open channel closure embankment with a dismantled cofferdam in the upper reaches of a river course. 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 current diversion open channel interception in the prior art, th...

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Problems solved by technology

[0004] Aiming at the deficiencies in the current diversion open channel interception dike existing in the upstream cofferdam removal of the river course, the purpose of the present invention is to propose a brand-new diversion open channel closure occupation dike for the removal of the upstream cofferdam of the river channel, so as to solve the problem of There are many problems in the diversion open channel closure, such as poor stability of throwing and feeding, large loss of throwing and feeding, large amount of large material consumption and high closure index.

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