NMDOT Parts Catalog Part 2

NMDOT PARTS CATALOG – PART 2

DEVELOPMENT REPORT

• No distinction for slope blankets for metal or HDPE pipes were made because the primary dimensions of the concrete structure are the same. • Safety grates are not included in the model because they are too detailed for this catalog. • Skewed slope blankets are not included due to the feasibility of correctly modeling skew and having it interact well in Civil 3D. The goal of this catalog is to offer the user a simple and effective way to add commonly used parts into their projects while reducing the amount of duplicate and seldom used parts. A list of parts that were omitted, and the justification for their omission, is included in Appendix D . 4.2 STANDARD DRAWINGS ISSUES When modeling the structures detailed in the NMDOT Standard Drawings, there were instances when the Standard Drawings listed dimensions, notes, or callouts that were inconsistent with the intent of the structures or how they are built. Table 1 summarizes these issues. Table 1: Standard Drawing Issues Standard Drawings Issue Context and Reasoning

Culvert pipes should not have this restriction; they should be able to be built from 0.5% to a maximum slope with stable velocities. The slope blanket is shown with concrete around dimension “D” as the outer limits of the culvert pipe. However, “D” is listed in the dimension tables as inside diameters. The parallel to centerline roadway slope blankets are primarily used for turnout culverts in the clear zone. Per the AASHTO Roadside Design Guide, a 10:1 embankment slope off the turnout is preferred. However, there are no options for 10:1 slope, only 4:1, 6:1, and 8:1.

Callout: “1% TO 2% CULVERT SLOPE”

511-11 to 511-34

Dimension “D” for pipe outline

511-11 to 511-34

No 10:1 Embankment Slope Option

511-22 to 511-23

4.3 NEXT STEPS The next task for the NMDOT Part Catalog project will be to create training and documentation of the part creation process. The purpose of the training is to educate the NMDOT or consultants on how to customize the pipe network catalog and add structures they deem necessary. The NMDOT Part Catalog will be managed, which will include the addition or removal of parts, by NMDOT’s CADD Committee. Detailed documentation of the training will serve as a useful reference for this catalog.

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