Polyester Geogrid Solution for Fourth Bridge Over Panama Canal Project

BPM Warp knitting polyester geogrid solution selects high density synthetic fiber as raw material, uses the warp knitting oriented structure, latitude and longitude in the fabric to the yarn between not curving condition, the intersection unifies mutually with the excel in textile fiber filament bundle, forms the reliable combining site  displays its mechanical properties fully, which is suitable for reinforcement of various embankments and roadbeds, protection of slopes, reinforcement of cave walls, reinforcement of foundations for large airports, parking lots, dock yards, etc., which can be used for railways, highways, roads, aircraft runways, coal mines, metallurgy and water conservancy projects. The Usage for warp knitting polyester geogrid in the process of bridge Construction operation grows annually. BPM Warp knitting polyester geogrid play a important role for The fourth bridge over the panama canal project.

BPM Warp knitting polyester geogrid solution is composed of high molecular weight, high tenacity multifilament polyester yarns which is biaxially woven stretching in tension and coated with PVC or modified polymer mixture by the complex automatic warp knitting processes. Warp knitting polyester geogrid is the kind of biaxial geogerid with a compact woven fabric structure, various mesh sizes and specifications, it is specifically engineered to improve tensile reinforcement capacity in two principle directions to provide stronger adhesive force, better corrosion resistance, superior engineering and long-term design strength properties.  The warp knitting polyester geogrid has the characteristics of high tensile strength, high temperature range, excellent corrosion resistance, light weight, resistance to aging, inert to biological degradation and resistance to chemicals, alkalis, and acids, etc.  The polyester biaxial geogrid is widely used for soil reinforcement mechanically stabilized earth (MSE) projects where strength develops uni-axially which can provide further chemical, mechanical and ultraviolet protection.

BPM Warp knitting polyester geogrid solution is composed of high molecular weight, high tenacity multifilament polyester yarns which is biaxially woven stretching in tension and coated with PVC or modified polymer mixture by the complex automatic warp knitting processes. Warp knitting polyester geogrid is the kind of biaxial geogerid with a compact woven fabric structure, various mesh sizes and specifications, it is specifically engineered to improve tensile reinforcement capacity in two principle directions to provide stronger adhesive force, better corrosion resistance, superior engineering and long-term design strength properties.  The warp knitting polyester geogrid has the characteristics of high tensile strength, high temperature range, excellent corrosion resistance, light weight, resistance to aging, inert to biological degradation and resistance to chemicals, alkalis, and acids, etc.  The polyester biaxial geogrid is widely used for soil reinforcement mechanically stabilized earth (MSE) projects where strength develops uni-axially which can provide further chemical, mechanical and ultraviolet protection.

Over the past couple of decades geosynthetics, and geogrids in particular, were employed to create a reinforced soil block that supports the bridge superstructure and resists lateral earth pressures, especially seismic actions. Many geogrid reinforced soil abutments were built overseas and they have performed very well, especially during large seismic events. In Panama these structures are not prevalent. Geogrid reinforced soil abutments are bridge abutments comprising interlayered granular soil and geogrid  materials.

In recent years, applications of the Geogrid reinforced soil technology for bridge-supporting structures have gained increasing attention on the international stage. Depending on the facing rigidity, geogrid reinforced soil bridge-supporting structures can be grouped into two types: “rigid” facing and “flexible” facing structures. A “rigid” facing is typically a continuous reinforced concrete panel, either precast or cast-in-place, connected to geogrid reinforcements using a full-strength coupler or bodkin joint. A “flexible” facing, on the other hand, typically takes the form of wrapped geogrid, dry-stacked concrete modular blocks (segmental block wall), timber, natural rocks, or gabions. In contrast to a “flexible” facing, a “rigid” facing offers a significant degree of “global” bending resistance along the entire height of the facing panel, and thus offers greater resistance to “global” flexural deformation caused by lateral earth pressure exerted on the facing.

Both the bridge abutments and the approach embankments are supported by geogrid reinforced soil . The geogrid reinforced soil abutments have been constructed from angular crushed stone fill with uniaxial geogrids at 400mm spacings and a flexible facing of segmental blocks mechanically connected to the geogrids. The geogrid reinforced soil is supported on competent bedrock. The separation between the edge of the footing and the interior face of the wall is approximately 1.35 m (see Figure 7). The tensile strength of the geogrids ranges from 40 to 160 kN/m with higher (tensile) strength geogrid layers used beneath the bridge footings than within the backfill material. The vertical foundation walls are backed with a layer of polystyrene to reduce lateral earth pressures on the facing. A drainage system is incorporated into the backfill.