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Method for installing composite bend sections of pressure pipe for hydropower station and method for obtaining rotating installation angles of composite bend sections

A technology for pressure pipes and composite bends in hydropower stations, which is applied in the directions of pipes/pipe joints/pipes, pipe laying and maintenance, and mechanical equipment, etc., and can solve the problems of difficult installation and measurement and control construction.

Active Publication Date: 2017-05-10
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the difficulty in installation and measurement and control construction of pressure pipe composite bends in hydropower stations, the present invention aims to provide a method for installing composite bends of pressure pipes in hydropower stations. Difficult key technical issues to improve work efficiency

Method used

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  • Method for installing composite bend sections of pressure pipe for hydropower station and method for obtaining rotating installation angles of composite bend sections
  • Method for installing composite bend sections of pressure pipe for hydropower station and method for obtaining rotating installation angles of composite bend sections
  • Method for installing composite bend sections of pressure pipe for hydropower station and method for obtaining rotating installation angles of composite bend sections

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Experimental program
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Effect test

Embodiment 1

[0069] Embodiment 1 Numerical Analysis Algorithm of Rotation Installation Angle

[0070] According to the spatial geometric relationship of the compound elbow, the coordinates of the characteristic points on the inclined plane and the vertical or horizontal plane where the space compound elbow is located are obtained, and two intersecting vectors are written in the two planes, and then according to the vector product algorithm, the two are calculated. The normal vector of a plane, and finally use the vector cosine formula to solve the rotation installation angle of the composite elbow.

[0071] Such as figure 1 As shown, the space normal vector method is used to solve ω, and the specific steps are as follows:

[0072] (1) Find the coordinates of feature points. Known: the slope α of the upstream straight pipe section; the slope β of the downstream straight pipe section; the projected angle γ between the two axes of the upstream and downstream straight pipes on the horizontal...

Embodiment 2

[0078] Embodiment 2 The geometric drawing solution method of the rotation installation angle

[0079] For the special case that any one of the upstream and downstream pipe axes of the composite elbow is a horizontal line, CAD is directly used for geometric drawing to obtain the rotational installation angle of the composite elbow. Such as figure 2 As shown, the rotation installation angle ω adopts the CAD geometric drawing steps as follows:

[0080] 1) Work on a plane is the central angle of the composite elbow, draw a perpendicular line AG through point O, and intersect the extension line of AG at point C;

[0081] 2) Take point C as the center of the circle, and the length of the line segment CO as the radius, make a semicircle C;

[0082] 3) As ∠AGO”=γ, γ is the projection angle of the composite elbow on the horizontal plane, intersecting CO at the point O”;

[0083] 4) Make a parallel line O"O' to the straight line AC through the point O", and intersect the arc of ...

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Abstract

The invention discloses a method for installing composite bend sections of a pressure pipe for a hydropower station and a method for obtaining rotating installation angles of the composite bend sections, aiming at overcoming difficulties in installation, measurement and control construction of composite bends of pressure pipes for hydropower stations. The method for installing the composite bend sections of the pressure pipe for the hydropower station includes the steps of a), subjecting every pipe joint of the pressure pipe to alignment marking before installation; b), aligning a first joint of a composite bend adjacent to a tail pipe joint of an upstream straight pipe section with the tail pipe joint of the upstream straight pipe section; c), rotating the first joint of the composite bend by one rotating installation angle to complete installation of the first joint of the composite bend; d), sequentially subjecting subsequent pipe joints of the composite bend to hanging installation according to a method that a centre line of one previous bend section aligns with a centre line of the subsequent bend section until installation of the whole composite bend is completed. The method for installing the composite bend sections of the pressure pipe for the hydropower station solves the key technical problem about high difficulty in onsite installation and construction of large-pipe-diameter composite bends, and working efficiency is improved greatly.

Description

[0001] The application date of this invention is October 25, 2013. The title of the invention is "a method for installing a composite elbow section of a pressure pipe in a hydropower station and a method for obtaining the rotational installation angle of a composite elbow section", and the application number is 201310511192.8. Divisional application. technical field [0002] The invention relates to a method for installing a composite elbow section of a pressure pipe in a hydropower station and a method for obtaining the rotational installation angle of the composite elbow section, and is mainly suitable for on-site installation, measurement and control of a composite elbow section of a pressure pipe with a large diameter and multiple pipe sections in a hydropower station. Background technique [0003] The composite elbow is actually an elbow on an inclined plane in space. When the steel pipe has both corners on the horizontal plane and corners on the vertical plane, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L1/00
CPCF16L1/00
Inventor 张战午王增武刘昌桂邱树先
Owner POWERCHINA ZHONGNAN ENG