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Large-span suspension cable pipeline bridge finished bridge main cable line shape calculation method

A calculation method and pipeline bridge technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as errors, non-convergence of iterations, etc.

Active Publication Date: 2020-12-04
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0004] At present, engineering designers mainly use the plane parabola theory to estimate the three-dimensional force at the beginning of the main cable as the initial value of the iteration. For the space main cable, this method has a large error, which may cause subsequent iterations to fail to converge

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  • Large-span suspension cable pipeline bridge finished bridge main cable line shape calculation method
  • Large-span suspension cable pipeline bridge finished bridge main cable line shape calculation method
  • Large-span suspension cable pipeline bridge finished bridge main cable line shape calculation method

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[0070] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0071] The present invention makes the following assumptions to the main cable cable system of the space cable-shaped suspension bridge:

[0072] (1) The main cable and the sling are small-strain ideal flexible cables, and their materials satisfy Hooke's law, and the Poisson effect is ignored.

[0073] (2) The sling only inclines along the direction of the transverse bridge when the bridge is completed, and the inclination error of the sling in the direction of the longitudinal bridge during the construction process is ignored.

[0074] A method for calculating the main cable alignment of a long-s...

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Abstract

The invention relates to a large-span suspension cable pipeline bridge finished bridge main cable line shape calculation method, which belongs to the field of oil and gas pipeline crossing design, andcomprises the steps of estimating a three-way component initial value of a main cable starting end according to a space parabola theory; iteratively calculating and obtaining corrected three-way component force of the initial end of the main cable by utilizing a pitch line method; taking the three-way component force of the starting end of the main cable and the design control point as iterativeinitial values, and calculating the shape of the main cable and the unstressed length of each cable section by utilizing a space segmentation catenary theory; and obtaining an iterative variable increment by utilizing a correction influence matrix method, repeatedly iterating, correcting the three-way component force of the initial end of the main cable, and recalculating to obtain the line shapeof the main cable and the unstressed length of each cable section. According to the method, the problems of inaccurate design, excessive assumptions and too large calculation errors in the prior art are solved, and the calculation accuracy of the line shape and the unstressed length of the finished main cable of the suspension cable pipeline bridge can be greatly improved by adopting the method tocarry out design and calculation.

Description

technical field [0001] The invention relates to a method for calculating the line shape of main cables of a long-span suspension pipeline bridge, which belongs to the field of spanning design of oil and gas pipelines. Background technique [0002] Pipeline suspension bridges are generally composed of main cables, suspension cables, wind cables, wind stay cables, stabilizing cables (conjugate cables), stiffening beams, cable towers and anchorages. Since its main purpose is to transport oil, natural gas or water, supports are usually set up on the bridge deck for erecting pipelines, and a simple maintenance path is set up to facilitate the construction and subsequent maintenance of pipelines. Pipeline suspension bridges have a small width-span ratio, low structural rigidity, and are sensitive to wind resistance. Generally, wind cable systems need to be installed. The mechanical characteristics of the pipeline suspension bridge are: the load acting on the bridge deck and the v...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14
Inventor 左雷彬胡川川杨威詹胜文刘思萌陈晓晖李国辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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