2012-03-07_PERMIT FILE - C2010088 ‎(24)‎

• Permit No: C2010088
• IBM Index Class Name: Permit File
• Doc Date: 3/7/2012
• Doc Name: Union Pacific Track Roadbed Construction Specifications
• Section_Exhibit Name: Exhibit 16
• Media Type: D
• Archive: No

uNtar�`
Pac�F�r
Where field cutting of culvert pipes is required, the Industry shall make saw cuts, torch burning
will not be permitted.
8.21.09 LAYING CULVERT PIPE - Installation of culvert pipe shall conform to the current
AREMA Manual for Railway Engineering, Chapter 1, Part 4 and UP Company Bridge Standard
Plan No. 680020, Sheet 1 of 2 for CSP and UP Company Bridge Standard Plan No. 680030,
Sheet 1 of 1 for SPP. Each pipe culvert shall be laid true to the flowline grade. The minimum
gradient for any pipe culvert shall be zero point five percent (0.5 %) or as directed by the
Engineer. If two or more pipe culverts are to be laid parallel to each other, such parallel pipe
culverts shall be spaced to permit thorough compaction of the backfill as required by Section
8.21.10 below. Parallel culverts shall be separated by a distance of at least one -half (1 /2) of the
nominal diameter of the pipe culverts, but not less than twelve inches (12 ") nor shall it exceed
forty eight inches (48 "). Riveted corrugated metal pipe culverts must be placed with the inside
circumferential laps pointing downstream. The Industry shall cover exposed metal on the surface
of any bituminous coated pipe culvert before backfilling is commenced. Such exposed metal
must be covered with material which is approved by the Engineer and which includes:
a) Fiber Bonded Bituminous (composite) coating ASTM A -825 (steel only)
b) Polymeric Coating - ASTM A762 or AASHTO M245 (steel only)
c) Galvanized - AASHTOM218 or Aluminum (Type 2) - AASHTO M274 (steel only)
d) Asphaltic Coating - AASHTO M190 (steel and aluminum) (only 3 and 4 for structural
plate pipe)
Such material shall be applied to a thickness of approximately one sixteenth (1/16) of an inch.
All pipe culverts with a nominal diameter of 48 inches or greater shall be provided with a five
percent (5 %) vertical elongation. Field strutting shall be required only on very large structural
steel pipes, ten foot (10') or greater, or as specified on Drawings or Specifications.
8.21.10 BACKFILLING AND COMPACTION - Backfill materials shall be placed
simultaneously on both sides of the pipe culvert in uniform layers not to exceed six inches (6 ") in
thickness. For multiple pipes the backfill shall be placed simultaneously in uniform six inch (6 ")
layers between and outside of pipes. Each successive layer shall be compacted to not less than
95% (Modified Proctor) of maximum density as determined by ASTM D 1557 with moisture
content adjusted if necessary, and each six inch (6 ") layer shall be properly compacted before the
next layer is placed.
Backfilling shall be started and completed as quickly as possible after the pipe culvert has been
assembled and placed on its bed.
Special care must be taken to obtain adequate compaction under the pipe culvert haunches;
however, care must be exercised to avoid lifting of the pipe culvert as the result of tamping to
compact material under the haunch. Where pipe culvert is placed in a confined area, making it
difficult to obtain adequate compaction under the pipe culvert haunches though tamping, a
Controlled Low- Strength Material (CLSM) fill may be used, see UP Bridge Standard Plan No,
680000, Sheet 2 of 2.
34