The processed river gravel is used to produce material for Makapa's own construction company.
Makapa is based in the Bicol Region of the Philippines. It is a duly registered contractor with the Department of Public Works and Highways (DPWH) and specialises in creating horizontal infrastructures aimed at improving the environment for the local population.
Some of its work has involved construction of flood control structures and drainage systems to protect lives and properties against major flooding in the area. One of its latest projects has been processing river bed gravel to produce sand and gravel for consumption at its construction sites.
It is for this project that the mobile equipment was required; a jaw crusher to reduce the size of the feed material down to a manageable size and a screener to separate into the desired sizes. Not requiring the need to frequently move the equipment around on site after delivery, the wheeled range of Sandvik crushing equipment was proposed and UJ300 jaw crusher chosen due to its size and required capacity.
Sandvik UJ300 is a primary crushing unit fully assembled on a single trailer frame and mounted on a double-axle bogie. Electrically driven, it has been designed to offer simple and user-friendly operation aimed at high capacity production at a low cost-per-tonne. Suitable for use in a wide variety of applications, its design enables quick set-up and ease of maintenance, resulting in more uptime and higher productivity.
For Makapa, the UJ300 is ideally suited to its river gravel application. The grizzly feeder system, which has adjustable openings and a by-pass chute for greater flexibility, has a wire cloth screening element beneath which enables efficient removal of natural fines. The material is then fed into the Sandvik jaw crusher, single-toggle type, which possesses a deep, symmetrical crushing chamber for smooth material flow and high reduction efficiency, as well as hydraulic push button controls for simple operation. A soft starting crusher for trouble free operation and frequency inverter for feeder speed control are also fitted to optimize the feed and make the crushing process easier.
To size the products, Makapa selected the Sandvik QA335 Doublescreen. The QA335 is a highly productive unit that comes equipped with the heavy-duty Doublescreen system. This technology features two high velocity, angle adjustable screens, where both the primary and secondary screening angles can be adjusted to optimise screening performance and accuracy. With two independent double deck screens, this machine is capable of performing two screening processes in just one plant.
With the type of products Makapa is producing, the Doublescreen system enables it to accurately size the sand and gravel to the required specifications. They are processing G1 ( 20-40 mm) and G2 gravel (40-80 mm) and sand, and are currently producing 30m³, 50m³ and 70m³ respectively, which altogether results in an average capacity of 150m³ per hour. As they are a construction company, they are processing the material for their own consumption and for delivery to their project sites.
Chief engineer for Makapa's equipment and aggregates division Winston Cipriano comments “We are pleased with the performance and capacity of the Sandvik mobile plant. We have produced almost 100,000m³ in just 3-4 months with good fuel consumption."
Makapa has received local support from Sandvik distributor Inframachineries. Cipriano comments: “Inframachineries are very accommodating. They often contact us from time to time and we know they are always available should we need them.”