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Annular flat plate structure for cofferdam slope toe protection

A slope foot and ring-shaped technology, applied in the direction of infrastructure engineering, construction, etc., can solve the problems of unfavorable salvage, high cost and construction difficulty, easy siltation of river courses, etc., achieve obvious anti-scour effect, simple construction, and reduce engineering quantity Effect

Inactive Publication Date: 2021-08-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diversion wall involves underwater construction, which is costly and difficult to construct; throwing and filling the bottom protection material is easy to silt up the river, which is not conducive to later salvage

Method used

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  • Annular flat plate structure for cofferdam slope toe protection
  • Annular flat plate structure for cofferdam slope toe protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0018] Example 2: see figure 1 and figure 2 , the annular plate 1 of this embodiment is made of steel plate, and the thickness is 0.01-0.06m. Steel plates with better cold bending properties are used to resist the impact force generated by water flow. The water flow buffering portion of the annular flat plate 1 of this embodiment is arranged under the horizontal plane, and the width of the water flow buffering portion under the horizontal plane is 2-3 m. An anchoring device is provided on the embedded part in this embodiment, and the anchoring device is used to fix the embedded part and the slope foot 2 . In order to reduce the steel plate material in the cofferdam. The width of the embedded portion in this embodiment is designed according to the force analysis of the water flow buffer portion. The water flow buffer part of this embodiment includes an arc-shaped buffer part and an extension buffer part arranged on both sides of the arc-shaped buffer part, and the ratio of...

Embodiment 3

[0019] Example 3: see figure 1 and figure 2 , in the water tank test of this embodiment, an annular flat plate 1 structure protected by the cofferdam slope foot 2 is provided, the thickness of the annular flat plate 1 is d=0.01m, and the width b of the annular flat plate 1 outside the cofferdam 1 =0.10m, the arc length of the arc buffer part l 1 =0.58m, extended buffer length l 2 =0.35m. The test results show that after Q=60L / s flow scouring is stable, when the annular plate 1 structure is used, the annular plate 1 can adjust the water flow direction, and the scouring pit near the cofferdam slope foot 2 shifts to the middle of the river, and the cofferdam slope foot 2 be protected.

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Abstract

The invention discloses an annular flat plate structure for cofferdam slope toe protection. A cofferdam slope comprises a slope toe, the slope toe is arranged below a horizontal plane, an annular flat plate for buffering is horizontally arranged at an arc-shaped rotating foot of the slope toe, the bottom of the annular flat plate is tightly attached to the upper surface of a riverbed, an embedded part is arranged on the inner side of the annular flat plate, the embedded part is embedded into the slope toe, the embedded part and the slope toe are of a fixed integrated structure, a water flow buffering part is arranged on the outer side of the annular flat plate, and the outer edge of the water flow buffering part and the outer edge of the slope toe are the same in structure and are both of an arc-shaped bent structure. Construction is simple, cost is low, the anti-scour effect of the slope toe at the corner of the cofferdam, especially the longitudinal cofferdam slope toe is obvious, and cofferdam accidents caused by the fact that the cofferdam slope toe is scoured are avoided; and due to the fact that the annular flat plate at the cofferdam slope toe can adjust the water flow state and smoothen the water flow, the direction of part of the water flow is adjusted, direct undercut scouring of the riverbed surface at the cofferdam slope toe is avoided, and scouring of the riverbed surface at the cofferdam slope toe is relieved.

Description

technical field [0001] The invention relates to the field of cofferdam scour prevention, in particular to an annular flat plate structure used for protection of a cofferdam slope foot. Background technique [0002] When building dams, bridge piers, docks and other structures in the river, cofferdams are often used as temporary water retaining structures to form foundation pits on dry ground. After the cofferdam is built on the river bed, the water flow in the narrow river bed will be formed, which is a boundary layer separation flow caused by the protruding obstacles on the flow boundary. , whirlpools and backflows appear near the corners of the vertical and horizontal cofferdams, and the flow pattern is relatively turbulent, which will not only cause erosion of the riverbed, but also wash the cofferdam slope foot, threatening the safety of the cofferdam. Especially the hydropower project is large in scale, diversion and construction time is long, the quality and safety of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/04
CPCE02D19/04
Inventor 田忠谭亮许唯临王韦刘善均曲景学张建民邓军张法星
Owner SICHUAN UNIV
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