A ventilating and anti-scouring structure and anti-scouring method for a water-passing cofferdam

An anti-scour and cofferdam technology, which is applied in infrastructure engineering, construction, etc., can solve problems such as cofferdam collapse, and achieve the effects of good anti-scour effect, simple structure and low cost.

Active Publication Date: 2020-06-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the degree of scour is large, it may lead to the collapse of the cofferdam

Method used

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  • A ventilating and anti-scouring structure and anti-scouring method for a water-passing cofferdam
  • A ventilating and anti-scouring structure and anti-scouring method for a water-passing cofferdam
  • A ventilating and anti-scouring structure and anti-scouring method for a water-passing cofferdam

Examples

Experimental program
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Effect test

Embodiment 1

[0042] like image 3 As shown, this embodiment is the construction cofferdam of a large-scale hydropower station, which adopts concrete overwater cofferdam, and the design water retention standard of the cofferdam adopts the design flood once in 30 years during the dry period, and two pairs of diameters are set on the downstream weir surface 3-2 A 0.72m auxiliary pipe 2, two pairs of auxiliary pipes 2 are distributed on both sides of the slope, a main pipe 1 with a diameter of 0.9m, the elevation of the weir top 4 of the water cofferdam 3 is 950.6m, and the width is 60m. The elevations of the right and right weir shoulders are both 951.3m, and the widths of the left and right weir shoulders are 22m and 24m respectively.

[0043] like Figure 4 , this embodiment is simulated on a normal model of 1:60, the water level at the top of the weir is 951.62m, the water flow is good, the water flow climbs small, and the drop point of the water tongue 5 does not directly hit the downstr...

Embodiment 2

[0045] In this embodiment, one of the four auxiliary pipes 2 in the first embodiment is blocked, and only three auxiliary pipes 2 are left; the same is simulated on the normal model of 1:60, and the lifting water level of the top of the weir is 951.62m. The flow state of the water flow is good, the climb of the water flow is small, and the landing point of the water tongue 5 does not directly hit the downstream weir surface 3-2.

Embodiment 3

[0047] In this embodiment, two of the four auxiliary pipes 2 in the first embodiment are blocked, and only two auxiliary pipes 2 are left; the same is simulated on the normal model of 1:60, and the lifting water level of the top of the weir is 951.62m. The flow state of the water flow is good, the climb of the water flow is small, and the landing point of the water tongue 5 does not directly hit the downstream weir surface 3-2.

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Abstract

The invention discloses a ventilating and anti-scouring structure of a water cofferdam, which comprises a main pipe and a plurality of auxiliary pipes arranged inside the water cofferdam, the main pipe and the auxiliary pipes are arranged on the same horizontal plane close to the top surface of the weir, and The main pipe is perpendicular to the flow direction of the weir top surface, the two ends of the main pipe penetrate the water cofferdam, one end of the auxiliary pipe is vertically connected with the main pipe, and the other end penetrates the downstream weir surface; in addition, the present invention also provides An anti-scouring method for a cofferdam of the above-mentioned ventilated and anti-scour structure, by pre-embedding the main pipe and auxiliary pipes inside the cofferdam to form a ventilation channel, which has a better anti-scour effect, and at the same time balances the air pressure behind the weir , significantly improve the water flow pattern, and the structure is simple, easy to design and construct.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a ventilating and anti-scouring structure of a cofferdam and an anti-scouring method. Background technique [0002] In water conservancy projects, cofferdams are often used to retain water to form construction pits, and the safety of the cofferdam itself is crucial to the construction process. The cofferdam can be used as both a water retaining cofferdam and a water passing cofferdam. When used as a cofferdam, the water flow usually flows against the downstream surface of the cofferdam. When the cavity on the downstream weir surface is closed, a negative pressure cavity is formed behind the cofferdam, and the water flow in the foundation pit climbs and fluctuates along the downstream weir surface. , resulting in the erosion of the downstream weir face and cofferdam weir foot. If the degree of scour is large, it may lead to the collapse of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/04
CPCE02D19/04
Inventor 王韦李伟田忠
Owner SICHUAN UNIV
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