Method for producing large surface area geogrids with high tensile strength and large surface area geogrids

A geogrid having a large surface area and comprising single-layer, homogeneous, molecular-oriented bars with a high tensile strength which cross one another forming a multiplicity of crossing areas arranged next to and behind one another, wherein

• transverse bars forming an upper layer and disposed next to each other at a distance are resting on longitudinal bars forming a lower layer and disposed next to each other at a distance thereby forming a grid arrangement, wherein this grid arrangement is solidly connected at crossing areas of transverse bars and longitudinal bars by friction welding, and wherein the directly contacting surfaces of transverse bars and longitudinal bars in the crossing areas were directly heated and welded together by friction of said contacting surfaces.

Geogrids comprising

• longitudinal bars forming a lower layer and disposed next to each other at a distance;
• transverse bars forming an upper layer and disposed next to each other at a distance and disposed resting on the longitudinal bars forming the lower layer, wherein the longitudinal bars and the transverse bars cross one another, form a grid arrangement having a multiplicity of crossing areas arranged next to and behind one another, wherein this grid arrangement is solidly connected at the crossing areas of longitudinal bars and traverse bars by friction welding, and wherein the directly contacting surfaces of the longitudinal bars and the transverse bars in the crossing areas were heated and welded together by friction thereby furnishing a geogrid having a large surface area and comprising single-layer, homogeneous, molecular-oriented bars with a high tensile strength.