DE3600799A1 - Tracks for railborne land-transportation means - Google Patents

Abstract

The invention serves to provide an ideal line layout for the tracks of modern railborne land-transportation means. Less work is involved than with the previous method since, after determining any desired number of points and tangent angles of the line, all the computational work is carried out by the computer, including the output of setting-out measurements. If the computer has found track inclination values exceeding a limit dimension, the points which have been input should be shifted and the tangent angles which have been input should be changed appropriately in the corresponding areas of the line and the computing operation repeated.

Description

It is known that the carriageways for land-based means of transport previously using the alignment elements straight line and circular arc designed, calculated, staked out and created.

It is also known that between a straight line and an arc or between Circular arcs of different curvature each have a transition arc switched on must, if without him at the intended vehicle speed an impermissible jerk value (jerk = time-related change the lateral acceleration) would occur.

Finally, it is known that the roadway in the area of the circular arc depending on the curvature of the circle and the intended vehicle speed must be inclined to allow lateral acceleration Keep limits, with the road inclination usually in Course of the transition sheet is raised to the necessary value.

The described lane shape has the disadvantages

• - That with the help of the alignment elements straight and circular arc often no lane shape can be obtained that corresponds to the height of the terrain, the structural and other conditions as well as the Driving line (= line of vehicle speed over the axis of the path covered) is taken into account in an ideal way,
• - and that in these cases it is very labor-intensive to work with the iterative design and calculation of the ideal road shape at least approximate.

The described lane shape is historically determined by the following circumstances:

• - The previous computing aids did not allow others Alignment elements as straight lines and arcs (as well as transition arches) to use in the design on the surveying National network and to be staked out on a polygon to acquire. (In contrast, there are now computers with great performance to disposal.)
• - In the case of roadways which are subject to changes in location experienced (e.g. with track gratings in the ballast), the control and regulation easier, if the target state is one if possible simple geometric shape. (In contrast, at Roads of modern track-bound land transport - e.g. B. from Magnetic levitation trains or subways with ballastless superstructure - only very slight changes in position under operational influences to be recorded.)  
• - The lanes of the previous track-bound land transport generally placed directly on the ground. Height differences of the site can be costly and environmentally harmful, but technically easy due to different heights Dams or incisions of different depths are compensated. (In contrast, has the ideal adaptation to the height-related railing conditions when creating elevated lanes (e.g. for Magnetic levitation railways) with the aim of keeping the column heights as constant as possible gained a special meaning.

According to the invention in the design and creation of lanes for track-bound land transport in suitable cases as follows to proceed:

• - Definition of any number of points of an ideal route and Extract their geographic coordinates from the surveying Plan.
• - Set any number of tangent angles. If, due to technical reasons, the route is in several sections have to be disassembled, are the respective end points with the associated end tangent angles.
• - Specification of a suitable function on a computer, the number the constant to be determined by the computer of the total of the specified Points and tangent angles must correspond.
• - Enter the point coordinates and tangent angle in the computer.
• - Determination of the function constants and graphical representation of the function through the calculator.
• - Output of the coordinates of any number of further route points by the computer, if mapping is to be carried out.
• - Determination of the curvature values and their graphic representation by the Calculator.
• - Kilometry of the route and transfer of the curvature values to the completed route through the computer.
• - Design of the route gradient.
• - Enter the function of the (gradient-dependent) route line in the Computer.
• - Enter the regularity required for the road gradient values into the calculator.
• - Determination and graphic representation of the road gradient values based on the above Lawfulness and depending on the Curvature values and the speed values of the driving line.  
• - Creation of a polyline and input into the computer.
• - Determination and output of the stakeout dimensions related to the polyline through the calculator.

Claims (1)

 Design and creation of the lanes for track-bound land transport by specifying a function, its within a route section valid constants by specifying points and tangent angles of the route.