CEMP-E
TI 850-02
AFMAN 32-1125(I)
1 MARCH 2000
CHAPTER 9
CONSTRUCTION
1. CONSTRUCTION SURVEY.
a. The purpose of the construction survey is to mark the route to guide construction. It may be done in
two stages, especially in areas where significant amounts of earthwork and grading are needed. In the
first stage, enough marks are placed to define the basic track grade and drainage ditches. During this
stage, culvert locations should be checked to ensure that final track elevation will allow room for sufficient
cover over the culverts.
b. In the second stage, stakes are set for final grading and construction, including spiral and curve
locations, grade and side slope markers, bridge abutments, culvert centerlines, and frog and switch point
locations for turnouts. It is best to set stakes only a short time before they will be needed, to minimize the
chances of them being disturbed. Guidance on stake setting is given in table 9-1.
Table 9-1. Suggested Stake intervals for Final Survey
Track Category
Suggested Stake Interval (ft)
Tangents
100
Curves:
up to 3 degrees
100
3 to 6 degrees
50
over 6 degrees
25
2. INSPECTING MATERIALS.
a. Inspect Before Installation. It is recommended that all materials (new or secondhand) be inspected
before work begins. If there are questions concerning the materials, it is much better to handle them
before the material has been installed.
b. Ties. Although inspection of the ties at the plant is preferred, this is not always possible. However,
upon delivery to the project site, all ties will be inspected to ensure compliance with the project
specifications. Ties not meeting the specifications will be rejected. The inspector should receive a copy
of the treatment report from the treatment plant and check that a date and manufacturer's brand are
present on the ties.
c. Relay Rail. When relay rail is bought for the project, it will be inspected for wear and external defects
(end batter, engine burns, etc.), per project specifications. Standard gages are available to check wear.
3. SAVING SALVAGEABLE MATERIALS.
a. When removing rail and other track material (OTM) for stockpile at an installation or transfer to
another installation, rail of like weight and section (and OTM of like size and design) should be stacked
neatly together. Normally, spikes will not be salvaged.
9-1
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