Thanks for sharing! Excellent step by step illustration.

Thank you for sharing the step-by-step.

Nice work Ken.........

How does the inner jack removed from in-between the pipes?

awesome

The Iseki Unclemole was state of the art, in the 1980's. Now it is archaic. I have used Iseki, Soltau, and Akkerman. Iseki is good in certain ground conditions. The simplicity of it's control system is a plus on short drives in soft ground. In hard cohesive soils the Iseki is painfully slow. In glacial till with boulders, a Soltau was best. In hard rock the Akkerman was best, in my opinion. I am out of the business now, retired, but in some respects I miss it.

@se0509

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Thank you for sharing your comments according to experiences. Have you ever been at design part of microtunnelling?

What is normally the maximum diameter of pipes where microtunnelling will be suitable to use

Am Civil Engineer want to involve