A kind of river channel interception method and its arrangement structure

Abstract

The invention discloses a river course closure method. It includes the following steps, step 1: at the end of the flood season or the early stage of the dry season, pre-occupy the construction platform of the first-phase cut-off wall; step 2: pre-occupy the end of the construction platform of the first-phase cut-off wall Carry out anti-scour protection; step 3: start the construction of the first-stage cutoff wall, and fill in the downstream side weir body of the first-stage cutoff wall construction platform; step 4: when the river flow is relatively dry in the dry season, carry out the second-stage seepage prevention The wall construction platform occupies Helong and cuts off the riverbed; Step 5: After the second-stage cutoff wall construction platform occupies Helong and cuts off the riverbed, the second-stage cutoff wall construction begins, and the downstream side weir body of the second-stage cutoff wall construction platform is followed by filling construction; steps Six: After the first-phase anti-seepage wall construction platform and the second-phase anti-seepage wall construction platform are all occupied, the river closure is completed. The invention has the advantages of reducing the difficulty of damming and saving engineering investment. The invention also discloses a river course interception arrangement structure.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering construction diversion and interception, more specifically, it relates to a river channel interception method. More specifically, it is a method of interception that utilizes the anti-seepage wall construction platform as an interception embankment. The present invention also relates to the river closure arrangement structure adopted in the river closure method. The invention is suitable for water conservancy and hydropower projects in which a construction platform of an anti-seepage wall is arranged on a construction cofferdam. Background technique [0002] 1. Definition of interception [0003] In the process of building a cofferdam on a river, cutting off the water flow of the river and forcing the river to divert to the downstream from the built diversion and discharge structures or reserved channels is called interception. The interception methods can b...

AI Technical Summary

Problems solved by technology

[0031] The main problems of conventional river closure are as follows: (1) The closure flow at the end of the flood season or the early stage of the dry season is relatively large, the closure hydraulic index is high, and the comprehensive difficulty is great

(2) Medium and small stones (blocks with a particle size of 0.3-0.7m and a weight of 40-480kg), large stones (blocks with a particle size of 0.7-1.3m and a weight of 0.48-3t), extra-large stones (blocks with a particle size of 1.3- 1.6m or more, and the weight is more than 3 ~ 5t block stone), concrete block (volume is 0.117a 3 m 3 , weight is 0.28a 3 t tetrahedron or volume a 3 m 3 , weight is 2.4a 3 t hexahedron), steel frame gabion (for example, in the Three Gorges diversion open channel closure project, the upstream interception dragon mouth is roughened and the bottom is formed by a steel frame gabion with an overall size of 2.5m×2.5m×2.5m and a single weight of 23.5t) or steel wire Gabion (steel mesh pockets are used to pack medium and small stones, each stone pocket is 5-10t) and other interception materials have a large amount of materials to prepare, and the project investment is large

(3) The closure of the river is a last-ditch battle, the construction intensity is high in a short period of time, and the construction organization requirements are high

(4) In terms of construction procedures, the river closure is implemented first, and then the construction platform of the anti-seepage wall is filled, which affects the construction time of the anti-seepage wall

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