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A bridge pier scour protection method combining concave rotating normal surface and granular body

A technology of granular body and curved surface, which is applied in the field of scour protection of bridge piers combined with concave rotating normal surface and granular body, can solve the problem of lack of protection, achieve effective protection, reduce local erosion, and reduce energy Effect

Active Publication Date: 2022-04-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only does it fail to protect, it may even have the opposite effect

Method used

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  • A bridge pier scour protection method combining concave rotating normal surface and granular body
  • A bridge pier scour protection method combining concave rotating normal surface and granular body
  • A bridge pier scour protection method combining concave rotating normal surface and granular body

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Embodiment Construction

[0026] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become clearer. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

[0027] Firstly, the stress of the granular bodies in the pier scour pit is introduced. Such as figure 1 As shown, the force on the surface of the scour pit for granular particles can be simplified as: gravity, bed surface resistance, buoyancy, and water flow force.

[0028] Granular Gravity:

[0029] buoyancy:

[0030] Effective gravity: G'=G-F T

[0031] Flow force: A is the area facing the water: C D is the thrust coefficient;

[0032] River bed resistance: f 1 - the frictional force experienced by the particles at the bottom of the scour pit

[0033] f 2 - the friction force experienced...

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Abstract

The invention discloses a bridge pier scour protection method combined with a concave rotating normal curved surface and granular bodies. The method is used for the scour protection of bridge pier foundations of cross-sea or river crossing bridges. After the depth is determined, the concave rotating normal curved surface protection structure is laid, and the granular body of a specific thickness is laid inside the rotating normal curved surface protective structure. The protection method of the present invention combines the normal curved surface structure in the scour pit to resist the downwash water flow and the granular layer to weaken the horseshoe vortex. The normal curved surface structure is mainly used to resist the downwash water flow in front of the pier, and the granular layer can reduce the bridge pier. around the horseshoe vortex. During the service period of the bridge, the protection system can reduce the downwash water flow and horseshoe vortex energy around the bridge pier, reduce local scour, and effectively protect the foundation of the bridge pier. The invention is effective for basic protection of wading structures.

Description

technical field [0001] The invention belongs to the field of local scour protection of bridge foundations, and in particular relates to a bridge pier scour protection method combining a concave rotating normal curved surface and granular bodies. Background technique [0002] The local scour around the piers of cross-sea (river) bridges has a great impact on the safety of bridge foundations, and is the main cause of bridge damage. Bridge collapses caused by local scour around piers accounted for more than half of the total. Therefore, it is very important to effectively and fully protect the local scour of bridge piers. [0003] There are three reasons for the local scouring of the pier by the water flow: (1) The blockage of the pier leads to an increase in the surrounding flow velocity, which means that when the water flow encounters an obstacle, the cross-sectional area of ​​the water decreases, causing the local flow velocity to increase, and the sediment on the bed surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/26E02D31/06E02D19/02
CPCE01D19/02E02B3/26E02B3/00Y02A30/30
Inventor 孙志林董海洋孙逸之陈范君李宗宇种琳
Owner ZHEJIANG UNIV