Design method of high-speed ring road cross section line shape

A design method and technology of high-speed ring roads, applied in design optimization/simulation, calculation, instruments, etc., can solve problems such as increased construction difficulty, increased roadbed height, roadbed earthwork volume, and increased vehicle energy consumption

Active Publication Date: 2018-06-05
JIANGSU KECHUANG TRAFFIC SAFETY IND RES INST CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The existing cross-section alignment design has limitations and deficiencies in the design and calculation methods, mainly reflected in the fact that the horizontal width of the lane is often used for calculation in the design. When the cross slope of the road is small (low-speed lane), the horizontal width of the lane can be approximately equal to the The actual width, but when the cross slope of the road is large (high-speed l

Method used

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  • Design method of high-speed ring road cross section line shape
  • Design method of high-speed ring road cross section line shape
  • Design method of high-speed ring road cross section line shape

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Embodiment Construction

[0132] Design example Taking the 1-3-3-3 curve type of the cross section as an example, the design speeds of the four lanes are 70km / h, 120km / h, 180km / h and 220km / h respectively, and the radius of the circular curve is 500m. The method of calculating the superelevation of the lane from the width can obtain the design line shape of the cross-section lane.

[0133] Taking the optimization of the fourth lane as an example, the specific process is as follows.

[0134] Step 1: Assume that by introducing the Gaussian elimination method, the shape of the cross-section parabola is calculated as

[0135]

[0136] The design example is the 1-3-3-3 curve type of the cross section. Since the highest order terms of the polynomials of adjacent curves are the same, their height difference equations f(x) are the same, then a 2 =a 3 =a 4 = a, so the cross-sectional alignment can be simplified as

[0137]

[0138] Step 2: According to the design example, the parabolic constraint equat...

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Abstract

The invention provides a design method of a high-speed ring road cross section line shape by determining the actual width of a lane to calculate and deduce a high-speed ring road circular curve and across section line shape of a easement curve section of a road, solve an accurate cross-section of the high-speed ring road, and provide a basis for reasonable optimization of the cross-section, thereby effectively reducing subgrade filling height and earthwork filling and digging amount, and reducing the number of special-shaped plates on a cement concrete pavement. The design method of the high-speed ring road cross section line shape effectively solves a problem of changes in horizontal width of the easement curve section of the road and improves design rationality. The design method comprises the following steps: by introducing a Gaussian elimination method, calculating a cross-section parabola line shape; determining lane chord length on the cross section corresponding to horizontal width of the lane; and using the interval dichotomy to iterate repeatedly to make a target lane chord length approach a design value, and obtaining final lane horizontal width and filling height to determine the final line shape of the cross section.

Description

technical field [0001] The invention relates to the technical field of geometric design of high-speed ring roads in automobile proving grounds, in particular to a geometric design method mainly used for the cross-sectional alignment of curved road sections of high-speed ring roads. Background technique [0002] As the main facility of the automobile proving ground, the high-speed ring road generally requires a special geometric design method to provide effective, safe and relatively comfortable operating conditions for continuous high-speed driving tests on a relatively limited site. Its horizontal curve radius, transverse superelevation and other technical index requirements have far exceeded the limitations of expressway geometric design technical standards. On the other hand, the curved part of the high-speed ring road is completely different from the general road, and the geometric characteristics of the three-dimensional surface of the space have a great influence on th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 陆涛王羽尘马健霄宗晨宏
Owner JIANGSU KECHUANG TRAFFIC SAFETY IND RES INST CO LTD
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