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Bridge pier scour protection method with combination of downward-concave rotating normal curved surface and granular mixtures

A granular and curved surface technology, which is applied in the field of pier scour protection combined with concave rotating normal curved surface and granular, can solve the problems of lack of protective effect, achieve effective protection, reduce energy, and reduce local erosion Effect

Active Publication Date: 2021-05-04
ZHEJIANG UNIV
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  • 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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  • Bridge pier scour protection method with combination of downward-concave rotating normal curved surface and granular mixtures
  • Bridge pier scour protection method with combination of downward-concave rotating normal curved surface and granular mixtures
  • Bridge pier scour protection method with combination of downward-concave rotating normal curved surface and granular mixtures

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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 with combination of downward-concave rotating normal curved surface and granular mixtures, wherein the method is used for protecting the scouring of a sea-crossing or river-crossing bridge pier foundation, and when a local scouring pit around the bottom of a bridge pier or a bridge pile reaches a set depth, a downward-concave rotary normal curved surface protection structure is laid, and the granular mixtures with specific thickness are laid in the rotary normal curved surface protection structure. According to the protection method, resistance of the normal curved surface structure to underflushing water flow in a scouring pit and weakening of horseshoe-shaped vortexes by the granular mixture layer are organically combined, the normal curved surface structure is mainly used for resisting the underflushing water flow in front of the pier, and the granular mixture layer can reduce the horseshoe vortexes around the bridge pier. The protection system can reduce underflushing water flow and horseshoe vortex energy around the bridge pier in the use period of a bridge, reduce local scouring and effectively protect the bridge pier foundation. The method is effective for foundation protection of wading buildings.

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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IPC IPC(8): E01D19/02E02B3/26
CPCE01D19/02E02B3/26E02B3/00Y02A30/30E02B3/02E02B17/0017
Inventor 孙志林董海洋孙逸之陈范君李宗宇种琳
Owner ZHEJIANG UNIV
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