Besides compaction quality, the other factor with an impact on occupational safety is the incline of at least 35%. Using construction machinery to work on a slope like this inevitably entails potential safety risks such as rollover or slipping which may harm machine operators and other job site staff. After investigating the performance of different types of soil compactors, the project manager selected Ningxia Zhongyuantong Construction Machinery Rental Co., Ltd., a rental and construction company which has several HAMM 322 high-performance compactors in its machine fleet. In addition to performance, the HAMM 322 also provides a high level of safety because it is a fully hydraulically-driven compactor: it can completely self-lock by braking, eliminating the phenomenon of slipping on the slope and thus avoiding potential safety hazards.
Powerful drive system
On this project, semi-hydraulic compactors were not considered a qualifying machine option, as their climbing capacity is limited to a 30% incline – and that‘s before compaction has even been mentioned. The HAMM 322, meanwhile is fully hydraulically driven and its powerful drive system features an original Rexroth hydraulics system with hydraulic flow divider – a special feature for the Chinese market. Self-locking differential guarantees excellent climbing ability, allowing HAMM compactors to impress with their gradeability of up to 50% on soft soil. In fact, the high performance of the HAMM 322 compactor working on the slope totally convinced both the contractors and the project managers.
Scaling incline and compacting effortlessly
The contractor was highly satisfied with the compaction efficiency of the HAMM 322, as well as with its climbing ability. One reason for its efficiency is its engine, with a rated output of 164 kW which delivers plenty of power to ensure a sustainable and stable amplitude output when compacting along such steep slopes. Its static linear load of 62.4 kg/cm is every bit as impressive as its centrifugal force of 331 kN. This power feature leads to a high compaction performance. While compacting the final layer on the slope, for example, the HAMM 322 worked 6 hours a day at a compaction speed of 3 km/h. Compacting the dam with two passes in low amplitude mode, it completed 9,000 m² per day. The contractor used two HAMM 322 units for this project and this compaction performance made it possible to complete final compaction in the short time frame available at the end of the project without compromising on quality.