We assisted the Department of Public Works and Highways in designing, implementing and installing an effective rockfall solution
Baguio City, is a mountain resort city located in Northern Luzon, Philippines. It is known as the Summer Capital of the Philippines owing to its cool climate. The City is located at 1,500 meters above sea level and is serviced by Kennon Road, the shortest route for motorists from Manila. Notwithstanding, it is a tortuous road through steep sided valleys, up steep inclines, and alongside the deep ravines of the Bued River. The highway is prone to frequent rockfalls and landslides particularly in the rainy season and road closures are common.
Since 1990, the Department of Public Works and Highways have regularly tackled high-risk areas by road improvement initiatives. To prevent further and reoccurring rock fall incidents, DPWH have now implemented an aggressive program of slope stabilization using erosion control measures, drapery nets and reinforced rockfall nets. The brief is clear; solutions must be reliable, cost effective and last a long time. Our MacRO solutions meet all of these criteria whilst offering the very highest levels of protection.
One such project is located at Bawang on one of the steeper sections of the road; an area which regularly experiences detachments of medium-sized boulders and soils. Using our expertise in rockfall solutions, we assisted DPWH and contractors design, implement and install an effective solution. Our technical team carefully reviewed soil reports, topographical surveys and stability analysis. Given that boulder diameters range between 30cm and 80cm, we suggested an active rockfall system designed to keep detaching rocks in place. After modelling the slope with our in-house software, we proposed a composite, reinforced drapery net together with an erosion control mat.
SteelGrid® HR30 together with MacMat® 12.1 erosion mat were pinned to the slope using 5m-long 32mm rebar spaced at 2m intervals. The contractor, Goldrich Construction were provided with extensive support during the installation period ensuring that the 3,500sqm slope was covered, protected and completed in a timely manner. Commenced in April 2017, the project was finished in October 2017. This section of road now offers high levels of protection to pedestrians, vehicles and other property. We look forward to installing many more erosion and rockfall solutions along this notorious but hugely important route.
For more information, please contact us.