Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Reexamination Certificate
2006-08-22
2010-06-22
Lagman, Frederick L (Department: 3672)
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
C156S073600
Reexamination Certificate
active
07740422
ABSTRACT:
The invention provides large surface area geogrids with a high tensile strength, a method and apparatus for producing them, and their use as drain and reinforcement grids and as fences. The method for the continuous production of geogrids which have a large surface area and comprise thermoplastic bars which cross one another and are joined together by welding at the areas where they cross one another is characterized in that single-layer, homogeneous, molecular-oriented plastic bars with a high tensile strength are used and a multiplicity of crossing areas arranged behind one another and next to one another are intermittently welded simultaneously using the vibration-welding technique. In this method, a newly developed vibration-welding apparatus is used, which is characterized in that it has at least one vibration device which can be used to weld at least 100 crossing areas, preferably up to 500 crossing areas, simultaneously.
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Heerten Georg
Müller Volkhard
Priewich Stephan
Uehlemann Werner
Kasper Horst M.
Lagman Frederick L
Naue GmbH & Co. KG
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