incremental launching method without launching nose

[tuankogoro]

Hi everyone !!!Have a good day ^^
I'm new member. I'm looking forward to your help!!!
Yesterday, my teacher asked me if we can built a bridge which using  incremental launching method without launching nose. I have tried finding infomation on internet by my native language but my results I received is zero. I hope someone can help me to solve this problem.
Thanks for reading !