Analyse a pipe jacking design using our database of past project references.
Input pipe geometry
This tool is intended for a quick estimate and must not replace any design check.
Enter a number between 0.45 & 2.4m.
Tunnel drive lengthm
Enter a number between 0 and 500m.
Jacking force estimates
Use the table below to decide on your TBM jacking forces. We've found and used these to estimate your pipe jacking loadings.
The nearest standard pipe size is and we've used this for the estimates below.
Face load (kN)
Skin friction (kN/m)
Enter your own values
Enter a faceload between 0 and 3000kN.
Enter a skin friction between 0 and 100kN/m length of pipe.
Note: Stoppages in jacking can result in higher loads to restart jacking of approximately 25% within an hour and 75% within four hours of a stoppage.
Pipe size prediction
The predicted pipe size is based upon the nearest fit selection offered by FPMcann, featured in their tunnels and shafts jacking pipes brochure v2.0.
Nominal Diameter (A)
Wall thickness (B)
Outer diameter (C)
Spigot length (D)
Socket length (E)
Packer width (E)
Interjacks and jacking load prediction
Interjacks are required where jacking loads exceed the capacity of the pipes. Deflection angles resulting from levelling differences and a lack of squareness between pipes have a significant effect on capacity. For most projects angular deflection is typically controlled between 0.0 and 0.25 degrees.
Allowed angular deflection
Estimated face load
Estimated skin friction
Tunnel drive length
Max allowable jacking load
Total thrust required if no interjacks used
Max drive distance before interjack required
Number of interjacks required
Minimum launch shaft size prediction
Launch shaft size (L×W)
Entrance ring (a)
Jacking unit (c)
Thrust wall (d)
Entrance open space (e)
Approx. length for TBM (f)
Minimum retrieval shaft size prediction
Retrieval shaft size (L×W)
Arriving ring (a)
Hume pipe (c)
Approx. length for TBM (e)
The results of these tools must be verified by a qualified Civil Engineer.👷