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Rockfall Mitigation in Jalan Aegela – Ende City Boundary Preservation Project, NTT

ende-rockfall

The cut slopes in Aegela Road Preservation – Ende City Boundary, Nusa Tenggara Timur Province are composed by Fractured and Weathered Rock with high potential of rockfall.

Proper material selection is necessary to provide an integrated and comprehensive solution. Rockfall Netting – Secured Drapery System by Maccaferri was selected in consideration of its ability to allow surface infiltration and flexibility over conventional solutions that do not have a good sub-drain system.

According to rri.co.id, in 2019 Indonesian Ministry of Public Works and Public Housing has released IDR 175.1 billion budget for the construction and improvement of 547 kilometres of state roads. Those road sections are handled by Balai Pelaksana Jalan dan Jembatan Nasional Region 4 NTT in Ende that covers 5 districts in central and eastern Flores.

One of the state roads handled by BPJN 4 for the NTT region is Aegela Road – Ende City Boundary. The cut slopes at the Jalan Aegela Road Preservation – Ende City Boundary, East Nusa Tenggara Province consist of fractured and weathered rock with the high potential of rockfall. Proper material selection is necessary to provide an integrated and comprehensive solution. Rockfall Netting – Secured Drapery System by Maccaferri was selected in consideration of its ability to allow surface infiltration and flexibility over conventional solutions that do not have a good sub-drain system.

Rockfall Netting – Secured Drapery System was applied by using a combination of Steelgrid HR 30 as Netting Material and Rock Nailing with Length of 8m and Spacing of 2.5m x 2.5m. Following the Public Works Ministry Specification “Spesifikasi Khusus Interim SKh-1.3.16 Jaring Kawat (Wire Mesh) dan Net Kabel (Cable Net) Sebagai Pengaman Lereng Batuan”, Steelgrid HR 30 is categorized as jaring kawat kekuatan tinggi.

Steelgrid HR 30 or jaring kawat kekuatan tinggi by Maccaferri is a composite of double-twisted steel wire hexagonal mesh with high tensile strength steel cables, woven into the mesh during the manufacturing process as one system material. Steelgrid HR 30 combines the patented high strength steel wire mesh geocomposite with structural anchor, anchor plates, specific u-bolts, and mesh connectors.

Available in rolls of 3m x 50m, Steelgrid HR 30 complies the requirement of mesh tensile strength ≥ 145 kN/m (177 kN/m) following the standard of BS EN 10223-3 and has puncture strength 149 kN following the standard of UNI 11437. Rockfall Netting – Secured Drapery System by Maccaferri has great advantages such as:

  • Made and manufactured in Indonesia with international standardization;
  • Easy and convenient installation;
  • Available for combination with soil/rock nailing for slope/cliff stabilization;
  • Allows slope surface drainage;
  • Economically competitive.

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