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Measuring method and device for water resistance ratio of estuary bridge engineering

A technology of bridge engineering and measurement method, which is applied in the direction of measuring devices, hydraulic engineering, hydraulic engineering equipment, etc., can solve the problems of small shoal flow velocity, complex structure of shoal and channel, and difficulty in reflecting differences in estuary and river channels, and achieve high promotional value.

Active Publication Date: 2019-12-24
PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for the estuary, the shoals are developed, the shoals and deep grooves are alternated, the structure of the shoals is complex, the flow velocity is unevenly distributed in the section, the velocity of the shoals is small, the velocity of the deep grooves is large, or the angle between the axis of each pier and the water flow is different. several times
According to relevant scholars' research on some bridge projects in the Pearl River Estuary, it is shown that the water blocking ratio of piers arranged in different parts of shallows and deep grooves varies at different water levels (such as figure 1 As shown), therefore, even with the same water blocking area, the actual water blocking effect is very different, and the area water blocking ratio often needs to use the water level and high value as the judgment standard of water blocking degree, which is not direct enough, which leads to the existing The calculation method of water resistance ratio is difficult to reflect the differences of estuaries and rivers, and the water resistance ratio index is distorted

Method used

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  • Measuring method and device for water resistance ratio of estuary bridge engineering
  • Measuring method and device for water resistance ratio of estuary bridge engineering
  • Measuring method and device for water resistance ratio of estuary bridge engineering

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Embodiment 1

[0068] reference image 3 , Figure 5 and Image 6 , Crossing a continuous beam traffic bridge 2 between the two banks of the estuary and the river course. The length of the bridge is 200 meters (not counting the part on the bank). 4 bridge piers are arranged. The axis of the bridge is perpendicular to the main flow direction of the river, and the included angle β=90° , The structure of each pier 1 is the same, and the width is b=b1=b2=b3=b4=2m. Water flow at the first pier V 1 Direction and mainstream formation θ 1 =45°, the size is 0.6m / s; the water flow at the second and third piers V 2 , V 3 Consistent with the main flow direction, the sizes are 0.40m / s and 0.30m / s respectively; the water flow at the fourth pier V 4 Formation with mainstream θ 4 =30°, the size is 0.2m / s. Under the preset water level, the submerged area or water blocking area of ​​each pier 1 is A1 = 10m respectively 2 , A2=8m 2 , A3=4m 2 , A4=4m 2 . 4 measurement rounds were tested by the acoustic Doppler ...

Embodiment 2

[0070] reference Figure 4 , Figure 5 and Image 6 , A continuous beam traffic bridge 2 diagonally spans between the two banks of the estuary and river course. The bridge is 200 meters long (not counting the part on the bank). 4 bridge piers are arranged. The angle between the bridge axis and the mainstream direction of the river is β=60°, each The structure of pier 1 is the same, and the width is b=b1=b2=b3=b4=2m, then the effective width of each pier 1 in the projected section 4 is b'=b1'=b2'=b3'=b4'=2 / sin60 = 1.73m. Water flow at the first pier V 1 Direction and mainstream formation θ 1 =45°, the size is 0.6m / s; the water flow at the second and third piers V 2 , V 3 Consistent with the main flow direction, the sizes are 0.40m / s and 0.30m / s respectively; the water flow at the fourth pier V 4 Formation with mainstream θ 4 =30°, the size is 0.2m / s. Under the preset water level, the water blocking area of ​​each bridge pier is A1 = 8.65m 2 , A2=6.92m 2 , A3=3.46m 2 , A4=3.46m ...

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Abstract

The invention discloses a river mouth bridge engineering water blocking ratio measuring method and device. The measuring method includes the steps of S1. determining the position of a projection section of a bridge based on a bridge axis of the bridge and a channel thread direction; S2. determining the flow velocity V of each pier of the bridge in the projection section position and an included angle theta between water flow at the pier and the channel thread according to plane flow field characteristics near the projection section at a preset water level; S3. determining the water blocking area A of each pier based on the preset water level and the shape of the pier; obtaining water blocking flow of each pier through the following formula: q=AVcos[theta]; and obtaining the total water blocking flow of all the piers, q=[sigma]q; and S4. obtaining the flow Q of the projection section at the preset water level, and obtaining a water blocking ratio alpha=q / Q based on the total water blocking flow q of the piers. The measuring method provided by the invention fully considers the complex river channel structural form of a river mouth, can provide a relatively scientific water blocking ratio calculation method for bridge engineering design, and can provide relatively direct and accurate technical indexes for river mouth engineering management.

Description

Technical field [0001] The invention relates to the technical field of estuary power, in particular to a method and device for measuring the water resistance ratio of estuary bridge engineering. Background technique [0002] In river bridge engineering, substructures such as bridge piers and their caps occupy part of the flood passage area of ​​the river, increasing local flow resistance and impeding the river flow. Water resistance ratio refers to the ratio of the projected area of ​​wading building piers perpendicular to the direction of the water flow under the design flood (tide) water level to the area of ​​the same cross-sectional area before the construction of the project, and it is calculated as a percentage. In this sense, the bridge water resistance ratio actually reflects the degree of pier obstruction (or compression) of water flow, which can directly evaluate the water resistance effect of the project, and to a certain extent reflects the degree of backwater impact ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/00E02B1/00
CPCE02B1/00G01D21/00
Inventor 何用黄燕莫伟均何贞俊张金明刘霞叶荣辉穆守胜
Owner PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
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