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

Tailrace tunnel with variable crest elevation

A technology of tailrace tunnel and variable roof height, which is applied in water conservancy projects, hydroelectric power generation, hydropower stations, etc., can solve the problems that the pressure change problem has not been fundamentally improved or solved, and the life of the lining structure has a great impact, reaching the project The effect of reducing the quantity, reducing the difficulty of construction, and ensuring the safety of the structure

Inactive Publication Date: 2015-04-08
POWERCHINA ZHONGNAN ENG
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) Did not fundamentally improve or solve the pressure change problem caused by the alternating change of open and full water flow in the tailrace tunnel with variable roof height;
[0007] 2) Although the additional load caused by pressure changes can be borne by strengthening the lining structure of the tailrace tunnel with variable roof height, since the hydropower station is designed to have a service life of more than 50 years, switching on and off is a routine and frequent operation of the power station, and the long-term and frequent Load changes have a great influence on the life of lining structures

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
  • Tailrace tunnel with variable crest elevation
  • Tailrace tunnel with variable crest elevation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] like figure 1 As shown, a tailrace tunnel with variable roof height includes a tailrace tunnel body 1 whose top height is continuously increasing, and a ventilation hole 2 is provided above the top of the tailrace tunnel body 1 higher than the design tailwater level elevation, and the ventilation hole 2 is connected to It communicates with the outside world and is in the same direction as the main body of the tailrace tunnel 1; between the tailrace tunnel 1 and the ventilation hole 2, there are a plurality of ventilation holes 3 connecting the two.

[0023] The cross-section of the vent hole 2 is a city gate type, and its size needs to meet the minimum cross-section requirements for construction excavation.

[0024] At the starting end 4 close to the main body 1 of the tailwater tunnel, the first ventilation hole 3 is arranged first. If the length of the tunnel is less than 300m, the second ventilation hole is arranged next to the first ventilation hole at intervals of ...

Embodiment 2

[0029] like figure 2 Shown: a tailrace tunnel with variable roof height, including a tailrace tunnel main body 1 with continuously increasing top height, starting from the starting end 4 close to the tailrace tunnel main body 1, at intervals of 30m to 40m along the top of the tailrace tunnel main body 1 A row of ventilation holes 3 directly communicating with the outside world is arranged in sequence until the outlet 5 of the main body of the tailrace tunnel.

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 tailrace tunnel with variable crest elevation. The tailrace tunnel comprises a tailrace tunnel main body with instantly-increasing top height, wherein the top of the tailrace tunnel main body is provided with at least one vent hole communicated with the outside along the way. According to the tailrace tunnel with variable crest elevation, the problem of pressure change brought by alternate changes of non-full water flows and full water flows in the tunnel is thoroughly solved, alternating pressures of the water flows on a tailrace tunnel lining are eliminated, and thus the structural safety of the tailrace tunnel with variable crest elevation is effectively ensured.

Description

technical field [0001] The invention belongs to the field of water conservancy and hydropower engineering, and in particular relates to a tailwater tunnel with variable ceiling height. Background technique [0002] Under normal circumstances, if the tailrace tunnel of the underground hydropower station project is long, and the vacuum degree of the draft pipe in the adjustment guarantee calculation does not meet the requirements of the specification, a tailwater surge chamber needs to be installed. It is a new technology of hydropower engineering that has been developed in recent years to replace the traditional tailwater surge chamber with variable roof and high tailwater tunnels. The variable-height tailrace tunnel is a new type of tailwater flow channel shape, which is characterized by using the slope of the roof to connect the downstream water level with the roof at any point, and divides the tailwater channel into a full-pressure flow section and a non-pressure open flow...

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): E02B9/06
CPCE02B9/06Y02E10/20
Inventor 辜晓原覃玉兰
Owner POWERCHINA ZHONGNAN ENG
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