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Edit to add link
This is from ADS. Same standards for others. It didn’t copy drawing with the text.
https://ads-pipecanada.ca//pdf/en/1.03DW_-_Agricultural_Installation...
Like I said above, I made mine 1/2 round with steel pipe behind cutting edge attached with one bolt at back along bottom of bucket. I use it for tile replacement, not new install. I have Koehring 600 and tile plow for that.
V-Bottom (4” – 8” Diameter Pipe)
A V-shaped trench bottom is best used for pipe diameters 8” (200mm) or smaller, per ASTM F449-02; however, fittings should be installed using a rectangular trench. The shape of the “V” should be at a 90-deg angle and is typically formed using a plow attachment; see Figure 1. The pipe is pressed into the V-shaped void and provides adequate support to reduce horizontal deflection. Often times, the native soils are placed over top the pipe to bring the excavation up to the final grade. Soil classes 1 through 4 are suitable backfill materials for this trench construction. Fill heights, measured from top of pipe to surface, should be limited to 8ft when utilizing this type of trench.
Rounded Trench Bottom (10” – 60” Diameter Pipe)
STABLE NATIVE SOIL
ADS PIPE
90°
Figure 1 V-Bottom Trench
A rounded trench bottom is best used for pipe diameters 10” (250mm) or greater; however, fittings should be installed using a rectangular trench. A rounded trench bottom is commonly created using a shaped trencher or using a “spoon” attachment on an excavator bucket. Performance of the pipe in this type of trench is greatly dependent on the trench walls conforming as closely as possible to the outside of the pipe. The width of the spoon should be sized to accommodate the diameter of the pipe being installed. For spoon widths that greatly exceed the pipe diameter, the pipe will be allowed to deflect a greater amount until a point at which the sidewalls of the pipe are adequately supported by the trench walls or backfill material. The trench should be cut to a depth such that the bottom 180-deg (half) of the pipe is supported. See Figure 2 and Table 2 for trench dimensions.
Edited by ncianotiller 4/2/2022 16:22
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Backhoe buckets for drainage tile.
