Phoenix, Arizona, is one of the fastest growing metropolitan areas in the United States; the 4.7 million metro population is expected to reach 6.3 million in 2030, according to the U.S. Census Bureau.
New generation of pneumatic tire rollers
The HP series of pneumatic tire rollers is packed with technical innovations and further developments. Hamm has developed a common platform as the basis for all model variants in every market throughout the world. In addition, there are important innovations affecting the operator's platform, the water and additive sprinkling system as well as the ballasting.
In the 1960s, Hamm launched the revolutionary GRW and has continued to develop it up to the present day.
The new pneumatic tire roller generation will gradually replace the existing GRW series throughout the world in the course of the next two years. The first models, the HP 280i and HP 280, have already been available since the beginning of 2019. It is envisaged that all models and variants will be available worldwide by the end of the year.
As before, Hamm will produce the pneumatic tire rollers in different basic versions: the type HP 180 and HP 180i models with operating weights of 8 t to a maximum of 18 t and the HP 280 and HP 280i models with operating weights between 10 t and a maximum of 28 t.
Operator's platform with first-class field of vision
The new HP series pneumatic tire rollers also offer a modern, spacious operator's platform or panoramic cabin with maximum visibility over the machine and the construction site. In this respect all models comply with the new ISO 5006-2017 operator's field of view standard which is markedly stricter than the previous provisions.
In terms of machine design, Hamm is sticking with the proven asymmetrical frame concept in the HP series. This is not only a hallmark, it is also a quality advantage because it follows the track offset between the front and rear wheel sets and always allows a clear view of the outer flanks of the front and rear wheels.
Clarity and an unimpeded overview also prevail on the operator's platform. For example, on all models the operation is designed to be totally language-neutral and very easy to learn.
The minimal number of switches on the operator's platform are intelligently arranged. User guidance is assisted by the unambiguous colour-coded grouping. Drive control is via a joystick ergonomically positioned on the armrest. Numerous other details in the driver's cab ensure abundant comfort and a healthy working posture for the driver.
The HP series offers considerable latitude with its variable ballasting concept. For example, prefabricated steel, magnetite or concrete ballast bodies can be inserted into or removed from the large ballast compartments between the wheel sets using a forklift, for example. This can be carried out in the user's workshop or on the construction site. Hamm offers various ballast body kits for this purpose, allowing different weights to be achieved. Because the ballast spaces are located in the centre of the machine, the weight is always evenly distributed over both axles - perfect conditions for optimum compaction quality. Additional ballasting of up to 17 t is possible, depending on the basic weight.
In addition, the HP series also scores in terms of safety. Drivers can always reach the brake pedal quickly and reliably because it is an integral part of the seat-operating unit on all HP series models. This makes for the maximum possible operational safety because the brake is always easily accessible. This aspect is especially important particularly for heavy rollers weighing well over 20 t.
The new HP series rollers are visually identifiable by the large, newly designed water tank. Like the diesel tank, it is generously dimensioned so that the machines have sufficient capacity for a full working day without stopping to refill. For this reason alone, the rollers are already extremely productive.
Hamm also offers a supplementary water tank with a volume of 1,500 L for all HP series models. It may be used as a water reservoir for the sprinkling system, but also serves as an easily quantifiable, flexible supplementary weight.
Sprinkler system optimized
Hamm has also optimized the additive sprinkler system for the new HP series due to the profusion of special asphalts that tend to be difficult to process. High-quality compaction of these construction materials calls for sprinkling of the pneumatic tires with an additive.
Previously, the additive concentrate was mixed with water and then filled into a separate tank on the roller. On the new machines, the additive concentrate is simply filled without premixing. The dosage from the large additive tank with level monitoring can be controlled from the operator's platform in various addition levels. The roller doses and mixes the additive during the compaction in accordance with the specification. This also brings about an increase in quality, because Hamm avoids separation of the additive-water mixture. Swapping from water to additive can be done at any time at the operator's station.
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