Construction method for preventing bridge foundation in mountain river from being scoured

A bridge foundation and construction method technology, applied in water conservancy projects, sea area projects, river regulation, etc., to achieve the effect of simple construction, cost reduction, and solution to erosion

Inactive Publication Date: 2016-11-16
SHANGHAI LANGZHAO HIGHWAY & RAILWAY MAINTENANCEENG TECH
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Problems solved by technology

[0004] Aiming at the existing scour problems of bridge foundations in mountainous rivers, there is no comprehensive explanation from the concept of mechanics on how to prevent and control the scour risks of bridge foundations in mountainous rivers. According to the law of momentum MV=Ft, energy dissipation and speed-reducing surge pools are used to change the conditions such as flow velocity and scouring time, so as to prevent and control mountainous rivers and bridges. The purpose of scouring foundations of river bridges

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  • Construction method for preventing bridge foundation in mountain river from being scoured

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[0022] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.

[0023] Such as figure 1 As shown, for a bridge foundation in a mountainous river that has been eroded by erosion, the following reinforcement and prevention constructions are adopted for it:

[0024] (1) At the position 15m downstream of the bridge foundation, lay 1-2 rows of 10m-long prefabricated reinforced concrete piles, and drive 9m into the river bed as the fixed piles of the dam. The fixed piles are arranged along the cross section of the channel.

[0025] (2) Place 1m upstream or in the middle of the fixed pile (5-6m spacing) 3 Concrete prefabricated blocks (or block stones, fences) are 1m higher than the river bed to build a 1m high river dam. After a l...

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Abstract

The invention discloses a construction method for preventing and controlling the scour of bridge foundations in rivers in mountainous areas. The method specifically comprises: constructing a retaining dam on a river downstream of the bridge foundation to form a river energy-dissipating and speed-reducing pool. The construction method of the dam is as follows: drive at least one row of fixed piles in the riverbed along the section of the river, and the top of the piles is higher than the surface of the riverbed, and place a water retaining structure upstream or in the middle of the fixed piles to form a dam. Compared with the existing method for prevention and control of foundation erosion of bridges in mountainous rivers, the construction is simple, and only one dam needs to be constructed, and the cost is greatly reduced. Moreover, the setting of the dam can make the riverbed near the eroded bridge foundation back to silt, and gradually restore the embedding depth of the bridge foundation, thereby fundamentally solving the problem of bridge foundation scour.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a construction method for preventing and controlling the erosion of bridge foundations in mountainous areas. Background technique [0002] The erosion of bridge piers by floods is the main cause of bridge collapse, especially in mountainous rivers. There are many design and construction methods for the scouring of bridge foundations in mountainous rivers, and the design and construction specifications also have corresponding regulations, mainly considering the flow, river width, river bed geology and other conditions, but the design and calculation of scour is generally inaccurate. At present, the prevention and control measures for the foundation erosion of bridges in mountainous rivers that have been built are usually as follows: 1. For the sandy river bed bridge position, a cut-off wall is set up in the upstream, and a stepped drop wall is set up in the down...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/02E02B7/02
CPCE02B3/02E02B7/02
Inventor 朱汉华赵永利
Owner SHANGHAI LANGZHAO HIGHWAY & RAILWAY MAINTENANCEENG TECH
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