🏗️ FHWA Micropile Design (Grout-to-Rock Bond Stress 20-50 PSI, N80 Casing Steel)

High-Capacity Micropile Calculator

Design high-capacity drilled micropiles (pin piles / minipiles) for low-headroom foundation underpinning and seismic retrofits under FHWA-NHI-05-039: calculate ultimate geotechnical grout-to-ground bond capacity (Type A gravity / Type B pressure grouted bond length in soil and rock sockets), high-strength API N80 casing axial capacity, and deep foundation profits.

1. Project & Operating Inputs

Total Micropiles Installed (Pile Count e.g. 48 Drilled Micropiles)

Design Axial Load per Micropile (Kips e.g. 180 Kips / 90 Tons Compression)

Customer Bid Price for Supplied & Drilled Micropile ($ / Pile e.g. $4,850)

7" N80 Threaded Casing, #14 Threadbar, Neat Cement Grout & Drillers ($)

2. Financial Breakdown & Yield

FHWA HIGH-CAPACITY MICROPILES

Turnkey Micropile Underpinning Profit

Geotechnical Drilling Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost