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Get A Prescription For Viagra Online! 100% Satisfaction Guaranteed! Lowest Prices. Cheap pills online. Best medications for real men. Absolute anonymity & overnight shipping! The Green Grid System has been used successfully in ground stabilization applications throughout the world, from the rainforests of Central America to the Deserts in the Middle East. It works on the simple premise that soil or other granular material that is confined so that it cannot move laterally will distribute traffic loads more efficiently and to a greater extent than unconfined soils or other granular materials.
| instock🔥 |. If you want to take care of your health. go ,Know the uses, side effects, price, composition, substitutes,. Check More » An ideal soil material for use in civil engineering applications is one that compacts well and still drains water freely. The problem is that the better draining soils are difficult to confine in place. Green Grid provides the means to confine good draining soils. The U.S. Army Corps of Engineers experimented with a variety of methods that could be used to confine sand during an amphibious assault. Their solution was a product in which UV stabilized polyethylene strips are welded together, such that, when expanded, the welded strips from a rectangular panel made of individual cells that resemble a honey comb. Today, this same concept is employed by civil engineers all over the world to confine onsite materials.
A Green Grid placed on a steep slope holds the fill material in place. It resists the downward migration of material due to hydraulic flows. Also, the cell walls slow the flow of water down the slope. This action reduces or eliminates the formation of rills which area major cause of soil erosion. In Addition, water trapped in the cells will seep down through the fill soil, which promotes deep root growth. Green grid may also be installed on slopes subject to wave action. With Green Grid, small rip rap or rock that would normally be washed away can be used to control wave action erosion. A blanket of rock protects the shoreline creates an attractive fascia and restricts the growth of vegetation that can provide a home for rodents and insects. Large cell Green Grid is widely used for slopes with moderate inclines and low hydraulic action.
In very steep slope applications where it is not feasible to place the cell panels on the slope face, soils can be retained with the Green Grid vertical wall structure. A Green Grid section filled with local soils is used in both cut and fill situations. The cells not only hold the soil in place, they also provide drainage throughout the structure. A Green Grid gravity wall is constructed by filling the cells with onsite soils. An additional benefit of the Green Grid fascia is that the outer cells can be vegetated which gives the wall an environmentally pleasing look that also reduces water flow at the face of the wall.
Green Grid provides two major benefits for channel erosion protection. In channels where water velocities are under 6 ft / sec, Green Grid allows the placement of soil infill with grass cover or small rock on slopes that would normally be too steep to hold the rock. When velocities exceed 6 ft / sec, Green Grid is filled with concrete. The Green Grid provides a flexible form that holds the concrete on steep channel slopes. The cells create small concrete blocks that can adjust to irregularities on the slope face without cracking.
The Green Grid Channel Protection system offers a cost-effective alternative to the traditional formed concrete channels. The system eliminates the need to build forms and use reinforcing steel or expansion joints required by other concrete systems. The cellular structure creates a permanent flexible form acting as a series of changes in the slope, grade and subgrade soils without uncontrolled cracking. The precise cell depth makes calculating the amount of concrete accurate and easy and helps control concrete costs.
Use of Green Grid can significantly reduce the amount and / or quality of aggregates required to stabilize a poor load bearing soil. The cell walls keep the aggregate from being pushed away from the applied load. Because the filled cells are connected together, the panel acts like a big mat. Applied loads are spread over an extended area instead of directly at the point of contact. Due to the high costs and environmentally concerns of mining quality aggregates and, in many cases, the significant expense of hauling aggregates over long distances, engineers are specifying Green Grid to save costs in many ground stabilization projects.
Green Grid load support applications include construction of streets, roads, highways, parking lots, storage areas, construction entrances, fire and emergency vehicle lanes, runways, taxiways, aprons / overrun areas, railroad track beds, buried pipe bed, temporary access roads / logging roads, stream crossings, boat ramps and water / sewer lines to name a few.
Most road and parking systems consists of one or more layers of good quality fill materials placed and compacted on soil subgrades. The fill materials allow the system to support traffic loads that the soil, by itself, would not be able to withstand. Applied loads are transmitted through the base material both as vertical and horizontal forces. The function of the layer(s) of base material is to distribute the Imposed load / vertical forces over a large area, thereby reducing the pressure, which is transferred to the subgrade. The base material is able to distribute the loads because the individual aggregate particles lock lock together.
If the horizontal forces push the base material sideways, rutting develops, resulting in a thinner layer less able to resist additional load applications which lead to failure. Even a good quality base material, with the proper internal strength and interlocking of individual particles, can be forced to move laterally. Aggregate and soil materials for load support applications are inherently unstable. They are comprised of discrete particles of varying sizes that can slide over one another. They have relatively low shear resistance and will eventually fail under load. Also the poor quality subgrade in contact with the base material does not provide the required friction at the interface to restrain the movement.
In order to prevent lateral movement at the bottom or within the base layer, high modulus geosynthetics have been used for many years. Because if their strength, they are more capable of restraining the lateral movement of the base materials with which they come in contact. Research has shown that when aggregate is confined within the cellular confinement system, the subgrade materials can withstand more than 10 times the number of cyclic load applications before accumulating the same amount of permanent deflection recorded by the same aggregate in the conventional unconfined state.
Because the cell walls resist lateral movement, a lower quality, lower cost, base material can be used. Additionally, the base material can be more open graded which will dramatically improve drainage of the system, resulting in a longer expected nature is also forgiving on construction errors. If compaction is not carried out properly in an unconfined system, the surface will collapse fairly quickly. If a parking lot is not paved the storm water would be allowed to seep into the subgrade possibly eliminating the need for a detention pond. Another major benefit of stabilizing soils with Green Grid is the effectiveness of a geocell to distribute applied loads over a large area. Since each cell within a section is connected to adjoining cells, each section of Green Grid acts as a large mat or pad. Green Grid significantly reduces the pressure applied to the subgrade by a load exerted on the top surface of the Green Grid. The benefit is that stabilization can be achieved with a minimum amount of base material used in conjunction with Green Grid.
The Green Grid cellular confinement system significantly improves the load deformation performance and shear resistance of granular fill materials due to the hoop strength of individual cells, the passive resistance of infill material in adjacent cells and vertical stress transfer to adjoining cells. Triaxial compression testing of the Green Grid cell infilled with granular materials demonstrate that the Green Grid system imparts an apparent cohesion of approximately 150 kPa (3000 psf) to the unconfined material. This effective cohesion is in addition to the natural friction shear strength of the granular material.
The Green Grid cell walls are perforated and textured. The perforated cell wall provides increased frictional interlock with coarse aggregates and concrete and better root lock up with vegetated systems. The perforations also allow lateral drainage through the system, thus enhancing its performance in saturated conditions. The textured surface increases friction between the cell wall and the infill material.
A variety of Infill materials can be used with the Green Grid load support system. The choice of infill materials is based upon the demands of the specific project / problem, and for load support applications is predominatly granular, with a maximum size of 50mm, and can include sand, gravel, crushed stone, concrete, and other aggregates.
Transporting the Green Grid panels to the site is also very easy, because the panels come collapsed and are relatively light. The Green Grid panels can be prepared to widths of upto 12.5 feet. In cases where wider panels are required the Green Grid panels can be installed so that their long dimension is perpendicular to the longitudinal axis of the road.
Frequently Asked Questions
Q: To confine materials, can vertical stones be placed as edging?
A: In order for confinement of the material in a pavement layer to result in more effective load distribution the confinement has to occur within the cone of influence of the traffic load, which is a very small area. Confining the material at the edge of the road would have no effect at all on the load would have no effect at all on the load spreading ability of the material.
Q: Will the Green Grid not just add to the cost of the project?
A: in situations where a standard course has been developed the course can be reduced to one third with the use of Green Grid. This decrease in thickness of the one layer does not warrant an increase in the thickness of any other layers. The reduction in the thickness is achieved due to the ability of the vertical walls to resist lateral movement and the ability of the interlocking cells to spread applied vertical loads over a greater area.
In a situation where a 6’’ thick sub base course and 4.5’’ thick base course is employed, as is the norm in Pakistan, this 10.5’’ thick layer of stone mettle under a bituminous wearing surface can be replace by a 4’’ thick layer, or approximately on thirds, of the same stone mettle confined within Green Grid, under the same thickness of bituminous wearing surface.
The savings that can be realized through the use of Green Grid, both in initial construction and in reduced maintenance, would mean that more roads can be built to serve a greater number of people.
Q: Would any changes have to be made to existing construction practices?
A: the only step involved in the installation of Green Grid, that is not part of traditional construction procedure, is the actual deploying of the Green Grid material on the ground. No special preparation of the subgrade is required. The subgrade should be prepared to the same degree of smoothness and level of compaction as normally required. The Green Grid, due to its flexibility, can maneuver to rougher subgrade. Also no new specialized equipment is required for the preparation, deployment filling, or compaction of the Green Grid. These processes can be achieved very easily with manual labour or any other traditional construction practices. A 12 man crew working a 10 hour day can deploy and fill on the average 1 kilometer of road, 22 feet wide in 2 days.
The Green Grid is manufactured using state of the art machines of European Origin and routinely undergoes quality control using our inhouse lab, the polymer used to manufacture Green Grid is Glass Fiber reinforced High Density Polyethylene, stabilized and protected against thermal, ultraviolet, and oxidative degradation.
The thickness if strip is 1.35 mm +/-5% and is available in depths of 200 mm (8’’), 150 mm (6’’), 100 mm(4’’), 75 mm(3’’), and 50 mm (2’’). The dimension of the cell varies depending upon the level of stretching but is ideally 220 mm (8.625’’) long by 267 mm (10.500’’) wide. Standard panels are manufactured of 58 strips.
The welds have been specially designed to impart maximum strength to the system. The cell seam strength meets and exceeds the rigorous requirement laid out in the US Army Corps of Engineers, Technical Report GL-86-19-A Report, Appendix A. As per the report a 200 mm deep cell should have a minimum seam strength of 2000 N or 204 kgf.