Simplified design method for highway easement curves

A design method and mitigation technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as difficult direct calculation, difficult control of calculation accuracy, difficult calculation of chord-arc difference, etc., and achieve high efficiency and fast speed

Active Publication Date: 2013-01-30
CCCC SECOND HIGHWAY CONSULTANTS CO LTD
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the fitting line of the highway transitional curve, the design and calculation of the transitional curve are simplified; the precision of the transitional curve can be controlled according to the needs of highway design and construction; the calculation accuracy of the parallel line drawing o...

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
  • Simplified design method for highway easement curves
  • Simplified design method for highway easement curves
  • Simplified design method for highway easement curves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] A simplified design method for highway transition curves, comprising the following steps:

[0045] Step 1. Confirm the starting point of the road transitional curve, the end point of the road transitional curve, and the radius R of the starting point of the road transitional curve s0 , Radius R at the end point of the road transition curve e0 and the parameter A of the road transition curve;

[0046] Step 2. Set one end of the search line as the start point of the search line and the other end as the end point of the search line;

[0047] Step 3. Set the starting point of the search line as the starting point of the road transitional curve, and set the end point of the search line as the end point of the road transitional curve;

[0048] Step 4. According to the principle that when the offset distance between the search lin...

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 simplified design method for highway easement curves. The method comprises the steps of confirming a highway easement curve starting point, a highway easement curve terminal point and a highway easement curve starting point radius, a highway easement curve terminal point radius and highway easement curve parameters; setting a search line starting point as the highway easement curve starting point and a search line terminal point as the highway easement curve terminal point; calculating a maximum offset between a search line and a highway easement curve; and comparing the maximum offset with a preset accuracy control value to perform curve fitting. According to the simplified design method for highway easement curves, the design accuracy can be controlled accurately; fitting straight line or arc segments are few; control errors are calculated directly instead of being approximated iteratively, the speed is fast, and the efficiency is high while easement curves are drawn in mass; problems of difficulties in controlling calculation accuracy and calculating directly of parallel line drawing, relevant lengths and intersection and the like of easement curves are solved; and the problem that differences of chord arcs arranged on bridges on easement curves are difficult to accurately calculate is solved.

Description

technical field [0001] The invention belongs to the field of highway design and construction, and in particular relates to a simplified design method of highway transition curves, which is suitable for calculation and drawing of highway transition curves and offset lines thereof, and facilitates highway design and construction. Background technique [0002] The transition curve is a curve whose curvature continuously changes between a straight line and a circular curve, and between circular curves with different radii in the same direction. The current "Code for Design of Highway Alignment" (JTG D20-2006) stipulates that the clothoid is used as a transitional curve, so the clothoid is one of the important elements of the highway plane alignment. [0003] Clothoids are complex high-order continuous smooth curves. Its characteristic is that the radius of curvature r on the curve changes uniformly and decreases as the length of the curve l increases. That is to say, for two p...

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
IPC IPC(8): G06F17/50
Inventor 刘利民代恩刘东升郑亮董继恩吴强
Owner CCCC SECOND HIGHWAY CONSULTANTS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap