IFAI International Achievement Award of Excellence 2019
2019 International Achievement Award of Excellence
Davao City Coastal Road Project
Products:Geotube® Geosystems, Polyfelt® F Filtration Geotextiles, Mirafi® FM Fascine Mattress
Approximate size of project: 18.5 kilometers
Project location: Bago Aplaya to R.Castillo Street, Davao City, Philippines
Description of project:
Traffic volume in Davao City has been increasing recently due to its population and economic growth. In the inland part of the city, majority of people depend on vehicular public transportation services such as jeepneys, tricycles, and buses which contributes a lot in the worsening of the traffic congestion. The Davao City Coastal Road aims to abate and address the traffic congestion in the city by diverting private vehicles passing from the downtown area. The project will also improve inter-regional transport of goods and services passing through the city, as well as support the growth of agro-industrial sector. Apart from that, the project aims to serve as a tourism facility as esplanades, where parks, playgrounds, outdoor theater and botanical gardens shall be constructed.
The first of the five segments of the project, Segment A covers 1.79km along the coastline, costing PHP 1.96 billion. It started last September 2017 in Talomo, Davao City. The initial phase of the project consists of reclaiming 30 meters from the existing shoreline in order to construct a stable working platform for the coastal road project. Reclamation works were done using TenCate Geotube® systems. TenCate Geotube® GT750M geotextile tubes replaced the conventional laying of boulders as there are scarcity in the supply of armour rocks in the region. In-situ sand filling of the Geotube® GT750M geotextile tubes offers (i) a more economical solution with guaranteed speedy construction of the seawall, compared to conventional method of importing core rocks using barge; (ii) a more environmentally friendly solution with lesser carbon emission due to lesser import material required. The sandy materials dredged in the area were also used in filling the tubes which made the project more economical. Initial works of the project consists of furnishing and laying the Geotube® GT 750M geotextile tubes using A-Frames for alignment in order to serve as an edge dyke and revetment protection. The Geotube® GT750M geotextile tubes were filled hydraulically to 2m high, 25lm length and 12.6m circumferences by pumping sand slurry through the filling ports. To allow flow of fill material, the fill is in the form of sand/sea water slurry. The Geotube® GT750M geotextile tubes, being permeable, allows the water to pass through the fabric while the sand is being retained inside the tubes. Prior to filling of embankment of earth fill, TenCate Mirafi® FM2000 woven filter geotextiles were installed to serve as a basal reinforcement of the. To make the tubes a permanent mass gravity structure, a layer of TenCate Polyfelt® F68 filtration geotextiles were laid in to protect it from punctures from the overlying boulders.
The installation of geotextile tubes in Segment A of the project is completed. The flexibility of geotextile tubes speeded up the completion time of Segment A with lesser man power required, as the installation is more on mechanical methods. The output of the project made impacts with other Department of Public Works and Highways (DPWH) regions and district offices. New coastal road projects in Davao Oriental, Butuan City, Cagayan de Oro and Leyte are being designed using TenCate Geotube® to enhance the socio-economic of the Philippines.
