Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

River mouth bridge engineering water blocking ratio measuring method and device

A technology for bridge engineering and measurement methods, applied in measurement devices, water conservancy projects, water conservancy engineering equipment, etc., can solve the problems of low flow velocity in shoals, insufficient direct image of the discrimination criteria, and complex shoal and groove structures, and achieve the effect of high promotion value.

Active Publication Date: 2017-11-17
PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
View PDF3 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • River mouth bridge engineering water blocking ratio measuring method and device
  • River mouth bridge engineering water blocking ratio measuring method and device
  • River mouth bridge engineering water blocking ratio measuring method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] refer to image 3 , Figure 5 and Figure 6 , spanning a continuous girder traffic bridge 2 between 3 banks of the estuary and river channel, the bridge is 200 meters long (not counting the part on the bank), and four piers 1 are arranged, the axis of the bridge is perpendicular to the mainstream direction of the river channel, 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 V at the first pier 1 The direction and the mainstream form θ 1 = 45°, the size is 0.6m / s; the water flow V at the second and third piers 2 , V 3 Consistent with the mainstream direction, the magnitudes are 0.40m / s and 0.30m / s respectively; the water flow V at the fourth pier 4 form θ with the mainstream 4 =30°, the size is 0.2m / s. Under the preset water level, the submerged area of ​​each pier 1, that is, the water blocking area is A1=10m 2 , A2=8m 2 , A3=4m 2 , A4=4m 2 . 4 test rounds were tested by the acoustic Do...

Embodiment 2

[0070] refer to Figure 4 , Figure 5 and Figure 6 , a continuous girder traffic bridge 2 is obliquely spanned between 3 banks of the estuary channel, the length of the bridge is 200 meters (not counting the part on the bank), and 4 piers 1 are arranged. The structure of pier 1 is consistent, and the width is b=b1=b2=b3=b4=2m, then the effective width of each pier 1 on the projected section 4 is b'=b1'=b2'=b3'=b4'=2 / sin60 = 1.73m. Water flow V at the first pier 1 The direction and the mainstream form θ 1 = 45°, the size is 0.6m / s; the water flow V at the second and third piers 2 , V 3 Consistent with the mainstream direction, the magnitudes are 0.40m / s and 0.30m / s respectively; the water flow V at the fourth pier 4 form θ with the mainstream 4 =30°, the size is 0.2m / s. Under the preset water level, the water blocking area of ​​each pier is A1=8.65m 2 , A2=6.92m 2 , A3=3.46m 2 , A4=3.46m 2 , the effective length of the projection section 4 is as Figure 4 As show...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 dynamics, 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 piers and caps occupy part of the flood discharge and flow area of ​​the river, which increases the local water flow resistance and hinders the flow of the river. The water blocking ratio refers to the ratio of the projected area of ​​the pier of the wading structure perpendicular to the direction of water flow under the design flood (tidal) water level to the area of ​​the same cross-section before the construction of the project, and it is calculated as a percentage. In this sense, the water blocking ratio of bridges actually reflects the degree of obstruction (or compression) of water flow by bridge piers, which can directly evaluate the water blocking effect of the project, and to a certain extent...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com