Bore Path Geometry for Plastic Pipe

In addition to the bore-path-geometry methods discussed for steel pipe in Chapter 6, other methods from ASTM1 and plastic pipe organizations1 are often used for plastic-pipe crossings. These methods use an average radius of curvature for the pipe section from the entrance of the bore hole to the end of the curve. Figure 7-1 defines a typical bore-path profile used for plastic-pipe crossings. The values are assigned based on the profile required to successfully cross the obstacle while reaching the required depth.

This method can assist the engineer in designing the bore path. The equations that follow are estimates, and the engineer should use judgment and experience in applying them.

Existing Grade

HDD Exit Point Product Pipe Entry

Pipe Exit Angle p

Pipe Exit Angle p

HDD Entry Point Product Pipe Exit

HDD Exit Point Product Pipe Entry

Hdd Pipe Reamer

Pipe Entry Angle a

Pipe Entry Angle a

HDD Entry Point Product Pipe Exit

FIGURE 7-1 Bore Path Example

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