PRECAST CONCRETE PIPE

[Pages:26]PRECAST CONCRETE PIPE

WHY PROVIDE GUIDELINES?

? Past problems. ? Was tedious to keep track of variables. ? Was easy to make mistakes. ? Wanted a design tool to reduce

problems.

TOPICS

? Minimum Structure Size. ? Maximum Angle into Rectangular

Structures. ? Minimum Angle between Pipes entering

Round Structures. ? Minimum Pipe Depth.

MINIMUM STRUCTURE SIZE

? The precast opening is typically 6 inches larger than the pipe's outside diameter.

Pipe Opening

MINIMUM STRUCTURE SIZE

Table 4-2 of

Storm Drain Handbook August 2000

Minimum Dimensions For Structures

Values based on Openings for Concrete Pipe

Maximum Angle (Skew) into a Rectangular Structure

MAXIMUM ANGLE (SKEW) INTO A RECTANGULAR STRUCTURE

12" Precast Opening

60" Precast Opening

6" OD Pipe

6" Structure

Wall

54" OD Pipe

MAXIMUM ANGLE (SKEW) INTO A RECTANGULAR STRUCTURE

Cos = Pipe OD R

R = Pipe OD Cos

Tan = y Wall Thck.

y = Wall Thck. x Tan

Structure Wall

R

y

Pipe

GcToonootrdluepcrtriaoacnntitcoceleetroaanlcloew. 2" of

Skew

Tolerance = Precast Opening ? R ? y

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