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Zanesville-based Shelly & Sands, Ohio, uses a new HDO120V and an existing HDO90V to quickly complete pavement compaction work and reduce costs. At the end of summer 2005, the company had two HDO90V, one HDO120V, four HD120HV and three HD110VHV rollers. In July of the same year, in addition to owning two 1110WB and one 1110RTB Vogele paver, the company purchased a 2219W paver from Vogele USA. In addition, Shelly & Sands also has a Wirtgen 1900DC cold milling machine. The equipment was purchased from Wirtgen's Ohio agent, Mclean. “It is a pleasure to work with this company and receive timely technical information and spare parts service,” said equipment manager Steve Schlosser. “In comparison, other agencies are slower. ” As early as 3 years ago, Shelly & Sands Company used Hamm products extensively. “We have a lot of Hamm products because they are well-equipped,” Schlosser said. “Compared with other brands of rollers, our staff likes to use Hamm products. It was time to update the old equipment that could not meet quality control, and Hamm helped us. ” 1. Advantages compared to vibratory rollers "Vibratory rollers generally leave people with a good impression, and they also have some advantages," said Ed Morrison, quality control manager of Shelly & Sands. “However, for some difficult-to-handle mixtures, e.g.: On airports and super surfaces, oscillating rollers perform very well. We will also be using it to compact SMA material later this summer. Whenever we encounter an intermediate layer or surface layer that is difficult to compact, using the Hamm oscillating roller can achieve good compaction results. ”There are several reasons, he said. “One is the time available for compaction is longer," Morrison said. “Oscillating rollers are adapted to lower compaction temperatures and will not crush aggregates like vibrating rollers. This 'kneading' compaction method can be carried out at lower temperatures, so the compaction time is longer. ” Oscillatory compaction exerts a horizontal shear force on the hot asphalt mix, with the drum never moving away from the material being compacted, rather than compacting the material in an up-and-down pattern. Unlike traditional vibratory rollers, which achieve compaction by bouncing the drum on the ground, oscillation technology ensures that the drum is always in contact with the material being pressed, ensuring faster and more effective compaction. In the oscillating steel wheels of HDO90V and HDO70V, there are two eccentric blocks rotating in the same direction, thus generating a moment on the steel wheel shaft. ； There are four eccentric blocks in the oscillating drum of the HDO120V. Every time it rotates, the torque changes direction, causing the horizontal oscillation of the steel wheel, and the horizontal force is transmitted from the steel wheel to the road surface. In this way, better compaction effects can be obtained with fewer compaction passes, and the vibration impact on the driver and the surrounding environment is also reduced. * * decrease. When compacting the intermediate layer on a section of road in West Virginia, other brands of vibratory rollers only achieved a density of 92% (requiring a minimum density of 91.5%), while the Hamm vibratory roller achieved a density of 94% when the material temperature was 54.4°C. “When it comes to meeting minimum density requirements, oscillating rollers have great advantages, not only meeting the needs of the job, but doing so very well. ”Morrison said. “If a conventional roller is used, when the density reaches a critical value and the temperature of the material drops below a certain temperature, the aggregate will be destroyed if compaction continues. In this regard, oscillating rollers do a better job. ”In addition to achieving the ideal density of the asphalt layer at the optimal temperature, the Shelly & Sands oscillating roller can also excellently solve the problem of road smoothness. “The oscillating roller also helps us achieve a good surface finish,” says Morrison. “Today’s new asphalt mixture hardening speed * * Speeding things up, having a Hamm oscillating roller increases our odds of successfully compacting the mix and achieving the desired smoothness. ” 2. Compact HMA (hot mix asphalt) at lower temperatures. In a fundamental sense, for asphalt production, oscillation technology helps save fuel and reduce costs. Because oscillating rollers can efficiently compact asphalt mixtures at much lower material temperatures, it is possible to produce lower-temperature hot-mix asphalt mixtures, reducing energy consumption, especially for large-scale asphalt mixing plants. * * The energy cost is reduced. “If the discharge temperature is reduced by -12.2 to -9.4°C, the money saved after one year can be used to buy an oscillating roller," said Scott Mclean, sales manager of Mclean's Columbus branch. “The discharge temperature of the mixture does not need to reach 174°C, but can be reduced to 163°C. The temperature at which the material is discharged to the paver can be 143°C. At this time, the required density can still be obtained using an oscillating roller. ” 3. Related information ●The first oscillating roller in Ohio Shelly & Sands Company took the lead in purchasing the first oscillating roller in Ohio - HDO90V. “We started trying to use it to compact base materials on a construction site, and the effect was not very noticeable," Schlosser said. “We then moved the equipment to another tricky job site and saw a rapid increase in compaction. So we decided to rent an oscillating roller and purchased it at the end of the season. ” ●Introduction to Shelly & Sands Group Company Shelly & Sands Company is not only engaged in asphalt pavement construction work, but is also an associated enterprise of new technologies, such as: Distinguished for their Mar-Zane materials, their asphalt mixing plant also won the * * Environmental Award. When Shelly & Sands was founded in 1944, it was a small paving construction team of only 6 people, working in the small town of Dresden, Ohio. Today, Shelly & Sands serves eight key markets in four states and has paved more roads in Ohio than any other company. In 1946, the first aggregate processing plant, Muskingum River Gravel Company, was purchased for US$45,000. Now, there are five large storage sites along the river. Mar-Zane material production base, Mar-Zan is the abbreviation of Marietta-Zanesville, has 28 mixing plants and produces 3 million tons of hot mix asphalt mixture every year. ●HDO120V The 13t HDO120V is a new product at the Conexpo-Con/Agg2005 exhibition in the United States. Following the successful application of the HDO90V oscillating roller in 2003, it has further satisfied users' needs for larger tonnage rollers. The HDO120V is the largest asphalt roller in North America incorporating unique Hamm oscillation technology. This 78-inch wide tandem roller has an operating weight of 26,345 pounds. The rear wheel oscillates, and the front wheel uses traditional vibration. The vibration frequency of the rear wheel is 2160~2520rpm, and the vibration frequency of the front wheel is 2520~3000rpm. HDO120V is a product specially developed by Hamm Company for the North American market, because users here need an oscillating roller with a larger tonnage than HDO90V. The working width of this machine is 2m, which requires the redesign of the oscillating drum. Therefore, HDO120V uses four steel wheels instead of two eccentric blocks for the first time. In addition, this new device shares many of the advantages of the tried-and-tested HD120HV, such as: Best panoramic view, simple operation, best control performance, easy-to-maintain articulated steering system. The Hummer HDO120V large-scale oscillating compaction roller was used for night construction at JFK Airport in New York. The Hummer HDO120V large-scale oscillating compaction roller completed the main compaction work at the John F. Kennedy International Airport in New York earlier this year. JFK is one of the world's busiest airports by passenger traffic and the busiest international airport in the United States, with 37.5 million passengers in 2004, of which 17.4 million were international passengers. The airport is currently undergoing a reconstruction and expansion project, and the runway has been upgraded to accommodate the take-off and landing of the super large jet A380. This airbus can accommodate 550 to 800 passengers and is the largest commercial passenger aircraft in history. In the summer of 2005, in a full-night construction environment, Hamm rollers compacted the A380 runway, and contractor Intercountry paved Port Authority II mix to a total thickness of 12 to 14 inches. The oscillating roller compacted the pavement to a compactness of 98 percent, said contractor principal Rick Loret. As early as 2005, Intercountry completed a 300,000-ton super pavement pavement on the highway and used HDO120V, so Loret has relevant application experience. “The machine works very well," Loret said. “Vibration can alleviate road unevenness, but oscillation can completely eliminate road unevenness. I really appreciate the oscillation technology. It can quickly increase the density of materials, and can also achieve good compaction effects when attached to highway anti-collision guardrails. ” The protruding bolt structure of other rollers can damage the crash guardrail, but the Hamm will not. “Other rollers have bolts sticking out of the side plates, but not this roller," Loret said. From his experience, oscillation technology, as Hamm puts it, "the device is successful in both respects," says Loret. “Oscillation can quickly improve the quality of compaction. Although compaction still depends on temperature and layer thickness, the compaction effect is much better with oscillation technology."