Flashboard type current guiding, sediment intercepting and accumulation promoting hydraulic structure with holes and construction method

Abstract

The invention provides a flashboard type current guiding, sediment intercepting and accumulation promoting hydraulic structure with holes and a construction method. The flashboard type current guiding, sediment intercepting and accumulation promoting hydraulic structure comprises multiple porous components, multiple hollow rods and connecting components, wherein the multiple porous components areconnected into a whole; the multiple porous components are provided with multiple water-pervious holes, and are used for reducing the flow velocity of a current and promoting sediment accumulation; the multiple hollow rods are all fixedly arranged on the porous components, and are used for supporting the porous components to erect; hollow rods located at the lower parts of the porous components are provided with small holes; the connecting components are used for connecting two adjacent porous components, and are used for preventing the porous components from overturning. The flashboard type current guiding, sediment intercepting and accumulation promoting hydraulic structure with holes can be used for enabling part of the current to downstream flow through the water-pervious holes, is used for effectively decreasing the flow velocity of the current in the rear of the current guiding, sediment intercepting and accumulation promoting hydraulic structure, and meanwhile, can be used for enabling part of coming sediment to directly pass through porous plates; not only can the sediment be promoted to deposit in the rears of the porous plates, but also the toe scouring at the fronts andbacks of the porous plates can be decreased; the effects of slowing the flow and promoting the accumulation are effectively reached, and the action of guiding the current is also realized while the bank protection and the beach protection are achieved.

Description

technical field [0001] The invention relates to a device in the technical field of water conservancy engineering, in particular to a perforated plate-type water diversion, sand-retaining and silting-accelerating hydraulic structure and a construction method. Background technique [0002] River and coastal erosion is a common problem in the world, which brings severe challenges to the environment, industrial and agricultural production, and national economy. Therefore, it is necessary to take anti-scouring and sedimentation measures to protect the scoured parts. At the same time, due to the requirements of navigation and other water depths, it is often necessary to renovate the river channel, divert the flow to flush sand, and maintain the water depth of the channel. [0003] Existing protective measures mainly include dikes, hydraulic inserts, spur dikes, etc., but these traditional engineering measures often require a large amount of materials, and the construction period i...

AI Technical Summary

Problems solved by technology

The weak point of this invention is: 1, the pore diameter of arresting net hole matches with the size of arresting particle, makes the silt of smaller particle size pass through smoothly, and the promoting silt effect is not good

2. The overall water permeability of the arresting net is too large, and the effect of slowing down the flow rate of water is poor

3. The blocking net mainly relies on its own gravity to form a vertical sand blocking plane, and the stability effect is poor

The disadvantages of this invention are: 1. The water permeability of the box-type mesh permeable structure of the ballast stones at the bottom is too large, which is not conducive to the interception and deposition of silt

2. The box structure made of steel wire surface is susceptible to corrosion and erosion in water

3. There must be local erosion problems in the accumulation body built by the box. When the erosion pit reaches a certain scale, the device will lose its function

The main disadvantages of this invention are: 1, the caissons are arranged in a staggered interval, so that most of the momentum of the incoming flow acts on the caisson structure, which will bring greater structural stability to the hollow-out movable caisson in the center. big security risk

2. The caissons are arranged in a staggered interval, and the flow state of the water passing through the caissons is relatively disordered

3. The overall structure is complex and the construction cost is high

[0007] In addition, the inventor has carried out in-depth research on the hydraulic plugboard, but found that it has the following main defects: 1) poor stability and easy to be washed away by water flow; 2) the head of the board is often severely scoured, forming a large scour pit; 3. ) When the water flows over the insert plate to form an over-top flow, causing the deposited sediment to be washed away again

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