So, I have many of the infamous spider-mechs (such as in this question) roaming about in my highly futuristic setting.
My mechs are arguably huge: the main body is 7 meters tall, in a conical shape, the base facing up and the pointy end down.
A main set of 8 long legs keeps it hovering 2 to 3 meters above ground; those legs are mainly used for walking around and surpass obstacles. Another set of smaller legs is towards the point of the cone, and is used for precision movements or for object manipulation. Those mechs are powered by an internal electric motor, and the power source are my top-notch sci-fi batteries.
The whole thing weighs around 60 to 100 tons, depending on the model and the supplies carried.
Thus said, I need a plausible way to lift those spidermechs upwards.
Those mechs are used to transport material around in my gigantic, multi- layered world.
- The mechs must be carried up for at least 300 meters. Bonus points if the suggested method of lifting could carry them even further ahead.
- The lifting method should be reliable (e.g., no mech falling to its death, at least not often).
- No matter how cool, those mechs shall not fly, nor soar the sky as rockets.
- Also, I'd keep the presence of flying machinery in my setting to a mininmum.
- The mechs are used in construction, not in any battlefield.
- Keep in mind that in my setting there is no limit to the resources or to the scale of buildings. Everything can be as big and expensive as needed.
Given those needs, I'm currently thinking of employing sets of rails. Given 4 rails pointed upwards in a supporting structure, the mech could line up its legs in slots (2 legs per rail) and be carried up, either lifted from above by a far reaching crane (or a set of) or pushed upwards by something else.
I'm considering a way to use magnetism to push the robots upwards, in a similar way we have magnetic levitation trains today, but I don't know if it would be feasible for the upward movement (as far as I get it, the mechs shouldn't be pushed away from the rains, like maglev trains are, but on the rails from below).