Ventilation anti-scour structure of overflow cofferdam and anti-scour method

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

Active Publication Date: 2018-09-04
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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  • Ventilation anti-scour structure of overflow cofferdam and anti-scour method
  • Ventilation anti-scour structure of overflow cofferdam and anti-scour method
  • Ventilation anti-scour structure of overflow cofferdam and anti-scour method

Examples

Experimental program
Comparison scheme
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 ventilation anti-scour structure of an overflow cofferdam. The structure comprises a main pipe and multiple auxiliary pipes which are arranged in the overflow cofferdam, themain pipe and the auxiliary pipes are arranged on the same horizontal plane close to the top of the overflow cofferdam, the main pipe is perpendicular to the cofferdam top face overflow water flow direction, the two ends of the main pipe penetrate the overflow cofferdam, one ends of the auxiliary pipes are vertically connected with the main pipe, and the other ends of the auxiliary pipes penetratethe downstream cofferdam face. In addition, the invention further provides an overflow cofferdam anti-scour method based on the ventilation anti-scour structure. The main pipe and the auxiliary pipesare pre-buried in the overflow cofferdam, a ventilation channel is formed, the good anti-scour effect is achieved, the air pressure behind the cofferdam can be balanced, the water flow state can be obviously improved, the structure is simple, and design construction is facilitated.

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 Applications(China)
IPC IPC(8): E02D19/04
CPCE02D19/04
Inventor 王韦李伟田忠
Owner SICHUAN UNIV
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