Scope
The purpose of this section is to aid in converting an existing 440 yard running track to a 400 meter track.
2.0
Dimensions All dimensions should meet criteria as specified by IAAF, USATF, NCAA and NFSHSA.
A.
Calculation of Existing Dimensions
If possible, locate the existing radius monuments to determine the distance
between these points. Measure the distance from the measure line (20cm from a painted line or 30cm from a raised curb) on lane one to the radius point. Multiply the distance between radius points by two. Add that number to the total of two times the radius to measure line times 3.1416. The result of this calculation will be the distance that the track is shorter than, equal to or longer than 1,312.34’ or 400 meters at the measure line of lane one.
B.
Test Method If the track’s physical measurement is exactly 440 yards, or 1,320’, the
conversion can be made by decreasing the distance between radius points
3.835’. This will decrease the measuring distance in lane one by 7.67’. It is
suggested the conversion be done on one end of the track only. If the track
measures more or less than 1320’, make the proper adjustment to the above numbers.
To prevent instability of a narrow new subbase or rough joints between old and new material in the base, leveling and surface courses, it is recommended that conversion be accomplished by cutting and removing the existing surface at the inside of new lane three so that the joint between old and new material will occur on a lane line. This method will require approximately 220 sq. yds. of new paving.
C.
Problems in Conversion
Other issues must be addressed to complete a successful conversion:
1.
Curb Replacement
It may be necessary to remove part of an existing curb and relocate it in accordance with the conversion measurements. Approximately 330’ of new curb will be required.
2.
Drainage
Check the drainage and slope in the area where any modification is
going to take place. Conversion must be accomplished without
interfering with surface or subsurface drainage.
3.
Excavation, Subbase, Base, Leveling and Surface Courses
All courses of new construction, as well as the slope of the finished
track, must be in accordance with the appropriate guidelines.
