Dynapac’s TH E Screed System
When contractors look to speed up the paving train, densities can suffer. To get more compaction directly behind the paver, the team at Dynapac North America LLC, Fort Mill, South Carolina, offers the TH E screed with Dynapac’s high compaction unit design (HCU-design). The V5100TH E and V6000TH E screeds have minimum widths of 8.37 and 9.85 feet and maximum working widths of 26.57 and 29.52 feet, respectively.
Both electric screeds feature spring and damping systems in combination with coatings that enable the design to combine three compaction systems in one machine. Here’s how it works:
The screed operator controls each stage of pre-compaction that the asphalt pavement material will encounter at the Dynapac screed remote. He can adjust the Dynapac TH E screed precisely to the jobsite requirements, setting the frequency of the high compaction bar independently from the hydraulic pressure and so on.
As the paver operator begins paving, hydraulic cylinders automatically lower the high compaction bar of the HCU. The head of material is fed to the pre-strikeoff and initial, smooth screed plate before it encounters the Dynapac tamper system.
The tamper bar delivers up to 1,500 rpms to the material as it passes to the second phase of the TH E screed—the Dynapac bottom plate of static weight and vibrations. The bottom plate converts the screed’s static weight into pure compaction with up to 70 bar maximum pressure.
The final stage of the system is the fully redesigned HCU. Static hydraulic pressure and high vibratory frequencies of up to 3,000 rpms (50 hertz) here offer pre-compaction of the mat.
When the paver operator stops the paver, the hydraulic cylinders automatically raise the high compaction bar of the HCU, preventing dips in the mat.
For more information, contact Vijay Palanisamy at (210) 818-9602 or visit www.dynapac.us.