Products

LAYING CONDITIONS

Type 1 *
Type 2
Type 3
Type 4
Type 5
Flat-bottom trench.** Loose backfill.
Flat-bottom trench.** Backfill lightly consolidated to centerline of pipe.
Pipe bedded in 4-in. minimum loose soil.¢ Backfill lightly consolidated to top of pipe.
Pipe bedded in sand, gravel or crushed stone to depth of 1/8 pipe diameter, 4-in minimum. Backfill compacted to top of pipe. (Approxi- mately 80% Standard Proctor, AASHTO» T-99.)
Pipe bedded in compacted granular material to centerline of pipe. Compacted granular or select¢ material to top of pipe. (Approximately 90% Standard Proctor, AASHTO» T- 99 )

Notes:

Consideration of the pipe-zone embedment conditions included in this figure may be influenced by factors other than pipe strength. For additional information on pipe bedding and backfill, see ANSI/AWWA C600.

* - Flat bottom is defined as undisturbed earth.
** - For nominal pipe sizes 14 in. and larger, consideration should be given to the use of laying conditions other than Type 1.
¢ - Loose soil or select material is defined as native soil excavated from the trench, free of rocks, foreign materials, and frozen earth.
» - American Association of State Highway and Transportation Officials, 444 N. Capitol St. N.W., Suite 225, Washington, DC 20001

Mechanical Joint Pipe

Maximum Allowable Joint Deflection

Size of Pipe Y - Maximum Joint Deflection in Degrees X - Deflection in Inches
18 ft. Length		 Approximate Radius in Feet of Curve Produced by Succession of Joints
18 ft. length
3 8°-18' 35* 140*
4 8º-18' 35* 140*
6 7º-7' 30* 160*
8 5º-21' 20 195
10 5º-21' 20 195
12 3º-35' 20 195
14 3º-35' 13.5 285
16 3º-35' 13.5 285
18 3º-0' 11 340
20 3º-0' 11 340
24 2º-23' 9 450

* 20 -Ft. Length

Push-on Joint Pipe

Maximum Deflection Full Length Pipe

Size of Pipe Maximum Joint Deflection in Degrees Deflection in Inches Approximate Radius in Feet of Curve Produced by Succession of Joints 3" same as 4"
18 foot length 20 foot length 18 foot length 20 foot length
3 5° 21 230
4 5° 21 230
6 5° 19 21 205 230
8 5° 19 21 205 230
10 5° 19 205
12 5° 19 205
14 4° 15 260
16 4° 15 260
18 3° 11 345
20 3° 11 345
24 3° 11 345
30 3° 11 345
36 3° 11 345