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2. Jackhammer - Wikipedia

   en.wikipedia.org/wiki/Jackhammer

   These tools are typically used to break up rock, pavement, and concrete. A jackhammer operates by driving an internal hammer up and down. The hammer is first driven down to strike the chisel and then back up to return the hammer to the original position to repeat the cycle.

3. Hammer drill - Wikipedia

   en.wikipedia.org/wiki/Hammer_drill

   Although each blow is of relatively low force, these thousands of blows per minute are more than adequate to break up concrete or brick, using the masonry drill bit's carbide wedge to pulverize it for the spiral flutes to whisk away. For this reason, a hammer drill drills much faster than a regular drill through concrete, brick, and thick lumber.

4. Digging bar - Wikipedia

   en.wikipedia.org/wiki/Digging_bar

   Using digging bars to move rocks A girl and a man dig a hole with a heavy digging bar to plant a tree. Common uses of digging bars include breaking up clay, concrete, frozen ground, and other hard materials, moving or breaking up tree roots and obstacles, and making holes in the ground for fence posts.

5. Bush hammer - Wikipedia

   en.wikipedia.org/wiki/Bush_hammer

   A bush-hammered concrete surface. Bush hammers exist in many forms, from simple hand-held hammers to large electric machines, but the basic functional property of the tool is always the same – a grid of conical or pyramidal points at the end of a large metal slug.

6. Powder-actuated tool - Wikipedia

   en.wikipedia.org/wiki/Powder-actuated_tool

   Powder-actuated tools come in high-velocity and low-velocity types. In high-velocity tools, the propellant charge acts directly on the fastener in a process similar to a firearm. Low-velocity tools introduce a piston into the chamber. The propellant acts on the piston, which then drives the fastener into the substrate.

7. After a century, concrete plant that helped build L.A. makes ...

   www.aol.com/news/century-concrete-plant-helped...

   A worker sprays water to keep dust down at the Cemex concrete plant in West Hollywood. A 34-story apartment building is being planned for the site. (Brian van der Brug / Los Angeles Times)