Seeing how quick the new hydraulic hammer drove through rock made me question old school impact methods

Everyone swears by the steady thump of diesel hammers for solid ground... but I think the faster pulse from hydraulics causes less shock to nearby structures and gets the job done sooner.

4 comments

4 Comments

alex_white3mo ago

On the highway expansion near Dallas, they used hydraulic hammers for bedrock. The crew said it cut their pile driving time in half compared to diesel. But I'm curious about the long term effect on nearby buildings. Have there been any studies on crack formation from the different shock waves? Also, what's the cost difference when you factor in fuel and maintenance? Honestly, I've seen videos where hydraulic seems smoother, but I wonder if it's just for show.

noaht155d agoMost Upvoted

@william791 has a point about seeing is believing with the newer tech. That speed and control difference is real in practice. But back to the vibration studies thing, the key factor isn't just the pulse speed, it's the frequency. Hydraulics tend to run at a higher frequency but lower amplitude, which actually means less chance of cracking foundations compared to the big thump from a diesel. I've read some DOT reports where they monitored buildings near pile driving and found the hydraulic hammer's waveform aligned more with the natural frequency of the soil, not the buildings themselves. Did the Dallas crew mention if they had to use any vibration monitoring sensors on those nearby structures, or was it just a feel thing for them?

william7913mo ago

Honestly used to believe diesel was unbeatable for real bedrock. Seeing the newer hydraulic tech in action was a total game changer for speed and control.

jakeh423mo ago

Actually, there are a ton of studies on this. The faster pulse from a hydraulic hammer makes a different kind of vibration wave than a diesel hammer does. It's often lower in overall energy.