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Multi-stage cushion layer protection method capable of relieving local scouring of pier foundation

A cushion and bridge pier technology is applied in the field of multi-level cushion protection measures, which can solve the problems of inability to remedy or improve the stress characteristics of the foundation, the huge cost of protection and post-maintenance, and achieve high economic and application value and simple post-maintenance. , the effect of low cost investment

Active Publication Date: 2021-10-22
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the most commonly used gravel protection as an example, its throw-fill protection cannot remedy or improve the mechanical characteristics of the foundation, but can only slow down the occurrence of further erosion
At the same time, the cost of its protection and later maintenance is often huge

Method used

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  • Multi-stage cushion layer protection method capable of relieving local scouring of pier foundation
  • Multi-stage cushion layer protection method capable of relieving local scouring of pier foundation
  • Multi-stage cushion layer protection method capable of relieving local scouring of pier foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A multi-level cushion protection device for slowing down the local erosion of the pier foundation is a device constructed to protect the pier 1, specifically including: a supporting device, a multi-level cushion protection device, and a dimension design of the multi-level cushion protection device Method, the installation method of the multi-stage cushion protection device;

[0044] The above-mentioned supporting and hanging device includes: four winches 2, main lifting rope 3, main lifting ring 41, single-layer stay rope 44, single-layer lifting ring 43, auxiliary rope 45, and auxiliary lifting ring 42;

[0045] Among them, four winches 2 are fixed on the four directions of the pier 1, the upper end of the main suspension rope 3 is wound on the winch 2, and the lower end is tied to the main suspension ring 41, the main suspension ring 41 buckles the single-layer suspension ring 43, and the single-layer suspension ring 43 is bolted Single-layer stay rope 44; Main suspen...

Embodiment 2

[0053] Such as Figure 7 As shown, a multi-level cushion protection device for slowing down the local erosion of the pier foundation, wherein the multi-level cushion protection device includes:

[0054] Flexible circular cushions with different radii;

[0055] The above-mentioned flexible circular cushion layer is sequentially placed on the bottom of the pier 1 according to the size of the radius;

[0056] Each flexible circular cushion is set behind the pier and fixed by butt joints at both ends of the bolts;

[0057] The above-mentioned flexible circular cushion is made of high-performance rubber or polyethylene composite material;

[0058] Such as Figure 7 As shown, in the protection of this embodiment, a multi-stage cushion protection device is used for one-time installation and fixed protection.

Embodiment 3

[0060] Dimensional design of multi-stage cushion protection, including:

[0061] A single cushion is a circular ring with a certain thickness, and its inner diameter is r i , the outer diameter is r o , the thickness is d, and its thickness d=P / n; wherein the number of cushion layers is n, n≥3, and the total height of the flexible cushion is P;

[0062] The inner diameter r of the above-mentioned flexible circular cushion i Slightly larger than the radius R of the bridge pier, the gap between the inner diameter of the flexible circular cushion and the bridge pier Δ=r i -R, Δ≤5cm;

[0063] The above-mentioned flexible circular cushion layer is the first layer, the second layer, the third layer from bottom to top, and so on, and the outer diameter of each corresponding layer is r o1 , r o2 , r o3 ......r on ; Similarly, the thickness of each layer is d 1 , d 2 , d 3 ... d n ;

[0064] The outer diameter of each of the above-mentioned flexible circular cushions decrea...

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Abstract

The invention discloses a multi-stage cushion layer protection method capable of relieving local scouring of a pier foundation, and belongs to the field of bridge engineering protection. By increasing the height of a front boundary layer of the pier and reducing the subsurface path of a subsurface flow in front of the pier, a counteracting vortex opposite to an original vortex is formed in front of the protection device, the strength of a horseshoe vortex in front of the pier is weakened, and scouring of the pier foundation is prevented. The device comprises a supporting and lifting device, a multi-stage cushion layer protection device, a size design method of the multi-stage cushion layer protection device and an installation method of the multi-stage cushion layer protection device. The method has the advantages that 1, the local scouring depth of the pier can be obviously reduced; and 2, the method can be used for protecting the pier in the early stage when the pier is not obviously scoured or protecting the pier in the later stage when the pier is obviously scoured, and has the advantages of being easy to install, low in cost investment and simple in later maintenance.

Description

technical field [0001] The invention relates to a multi-stage cushion protection measure with damping buffers applied to bridge pier foundations, and belongs to the field of bridge engineering protection. Background technique [0002] When a bridge is built in a natural channel, as one of the main forms of flow in a typical corner region, it will cause the separation of the boundary layer of the flow and form a horseshoe vortex or wake vortex system. The horseshoe vortex, which is the main reason for the local scour of the pier, will endanger the stability of the pier foundation. Therefore, how to weaken or disturb the strength of the horseshoe vortex in the corner area has become one of the main methods to solve the scour protection of the pier. It is generally believed that the submerged submerged current generated by the pressure gradient in front of the pier is the main reason for the formation of the horseshoe vortex. It will form different numbers of vortices at the s...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D19/02
CPCE01D22/00E01D19/02Y02A30/30
Inventor 徐华闫杰超夏云峰闻云呈张世钊杜德军王晓航王晓俊张帆一赵泽亚陈静薛伟陈靖
Owner NANJING HYDRAULIC RES INST