A pilebunker is a fictional tool or weapon composed of a pneumatic or hydraulic piston connected to a spiked shaft and recoil springs; Uses rapid compression to drive the piston forward which in turn drives a spike into an object, in a manner similar to that of a pneumatic hammer (jackhammer

Jackhammer

A jackhammer is a pneumatic tool that combines a hammer directly with a chisel that was invented by Charles Brady King. Hand-held jackhammers are typically powered by compressed air, but some use electric motors. Larger jackhammers, such as rig mounted hammers used on construction machinery, are...

), only the spike goes far into the object and then retracts quickly, readying itself for another strike.

"Pilebunker" is a category of weapons in the Front Mission

Front Mission

is a collection of video games and related media produced by Square, now Square Enix. The series was created by Toshiro Tsuchida and developed by G-Craft, a studio that was later absorbed by Square and is now with Square Enix as Product Development Division-6...

 video game series.

The Alt Eisen from the Super Robot Wars

Super Robot Wars

is a series of tactical role-playing video games produced by Banpresto, which is now a Japanese division of Namco Bandai. The main feature of the franchise is having a story that crosses over several popular mecha anime, manga and video games, allowing characters and mecha from different titles to...

 video game series is well known for its pilebunker-like weapon. Known as the Revolver Stake, it is activated with a six-chambered revolver like device, which increases the power of the of the attack with each 'shot' fired.