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Tubular sock module with integrated geogrid extensions for constructing stabilized-earth walls and slopes

a technology of geogrid extension and sock module, which is applied in the direction of excavation, construction, embankments, etc., can solve the problem that the wrapping of mse structures is limited to linear alignments

Inactive Publication Date: 2012-01-26
MILLER STANLEY MARK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The modular sock is preferably manufactured such that the sewing of the geogrid sheet to the sock wall is accomplished to ensure that the wide-width tensile strength of the stitched seam exceeds the wide-width tensile strength of the geogrid sheet itself. Thus, if an installed module were to experience an over-stressed condition, the geogrid extensions and/or hemispherical wrap would rupture before the seam would break, meaning that the known design strength of the geogrid sheet serves as the critical element in the geotechnical design analysis for the MSE structure.
[0012]The construction of an MSE earth wall or slope involves installation of a plurality of the self-supporting earth facing module units in succ

Problems solved by technology

In addition, these wrapped MSE structures are limited to linear alignments due to the manner in which the geosynthetic fabric is wrapped back over itself with each backfill lift.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Tubular sock module with integrated geogrid extensions for constructing stabilized-earth walls and slopes
  • Tubular sock module with integrated geogrid extensions for constructing stabilized-earth walls and slopes
  • Tubular sock module with integrated geogrid extensions for constructing stabilized-earth walls and slopes

Examples

Experimental program
Comparison scheme
Effect test

example 1

High-Performance Materials for Durable Applications

[0060]In most applications it would be advantageous to construct the geogrid extensions out of a high-performance geogrid material, which typically consists of high-tenacity knitted polyester yarns with high molecular weight and covered with a polymeric coating to provide excellent durability and engineering properties. Such geosynthetic materials are mechanically and chemically durable to resist both the harsh construction installation phase and long-term contact with aggressive soil environments (pH range from 3-9). For example, a prime candidate for these geogrid extensions on the modules would be Stratagrid® Microgrid™ manufactured by Strata Systems, Inc., which has the following properties / specifications:

[0061]Ultimate biaxial tensile strength (ASTM D 6637): 2,000 lb / ft

[0062]Creep limited strength (ASTM D 5262 and D 6992): 1,149 lb / ft

[0063]Long-term design strength (LTDS): 871 lb / ft

[0064]Minimum molecular weight (GRI GG8): 25,0...

example 2

Biodegradable Materials for Environmentally Sensitive Applications

[0077]In certain applications it would be advantageous to construct the tubular sock portion of the module out of natural and biodegradable fabric material, such as a coir blanket woven from coir twines made of bristle coir obtained from freshwater cured coconut husks. For example, the Bio-D Mat® manufactured by Rolanka International, Inc., is comprised of such coir twines that have been machine spun to a uniform diameter. This coir blanket has the following properties / specifications:

Fabric weight (ASTM D 3776):29oz / yd2Dry tensile strength (ASTM D 4595)Machine direction2024lb / ftCross direction1160lb / ftWet tensile strength (ASTM D 4595)Machine direction1776lb / ftCross direction936lb / ftThickness (ASTM D 1777)0.35in.Open area38percent

[0078]Using the aforementioned materials to construct the tubular sock module would result in the geogrid extensions being synthetic and the sock structure being natural and biodegradable. Th...

example 3

Vegetative Facing Wall

[0079]The tubular sock module can be filled with an aggregate, such as crushed rock or coral, or a blend of aggregate and growing medium such as compost or a soil / compost mixture. The specific infill mix selected for filling the tubular sock module would be based on job-specific criteria. In certain applications it would be advantageous to fill the sock module with a pre-seeded and pre-fertilized growing medium. The growing medium could consist of organic compost with the following properties:

Range of pH5.0-8.5Stability (carbon dioxide rate)Organic matter content (dry-weight basis)25-65percentMoisture content (wet-weight basis)30-60percentSoluble salt concentration (electrical conductivity)≦5dS / mPhysical contaminants, manmade inerts (dry-weightpercentbasis)Maximum particle length of 6 in., with a sizedistribution ofPassing 3-in. sieve100percentPassing 1-in. sieve90-100percentPassing 0.75-in. sieve70-100percentPassing 0.25-in. sieve25-65percent

[0080]The fertiliz...

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PUM

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Abstract

A self-supporting earth facing module has a tubular sock to be filled with compost or fill material and a geogrid sheet which wraps around the circumference of the tubular sock with upper and lower extensions extending lengthwise to one side of the sock. The geogrid sheet is joined by a high-strength seam to the circumference of the sock. The module forms an integrated unit that can be used to form sequenced horizontal earth layers and serve as facing for a geosynthetically stabilized earth wall or slope. The sock may be vegetation-supportive and have built-in connectable irrigation tubing. The modules are installed in consecutive vertical lifts with a granular interlock zone to provide a connection medium for tying adjacent modules to each other and to the reinforced soil zone, and which may include connection to supplemental geogrids that extend the width of the reinforced zone for taller slopes and walls.

Description

TECHNICAL FIELD[0001]The present invention is directed to a self-supporting earth facing module and method for constructing mechanically stabilized earth walls and slopes using a fabric, tubular sock module filled with compost or fill material and having integrated geogrid extensions for reinforcement of a geosynthetically stabilized earth zone.BACKGROUND OF INVENTION[0002]Soil reinforcement with layers of man-made inclusions, such as steel strips, steel grids, geotextile fabrics, and polymeric geogrids, has been used by geotechnical engineers for the past 40 years. The use of planar, horizontal reinforcing elements in a compacted soil backfill allows for the construction of mechanically stabilized earth (MSE) structures that include steepened slopes (known as reinforced soil slopes, or RSS) and near-vertical walls. FIG. 1 illustrates examples: of (1) vertical geosynthetic facing; (2) sloping geosynthetic facing; (3) sloping gunite or structural facing; (4) vertical precast concrete...

Claims

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Application Information

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IPC IPC(8): E02D17/18
CPCE02D17/202E02D29/02E02D29/0291E02D29/0241E02D29/0208
Inventor MILLER, STANLEY MARKJOAQUIN, ALAN CHARLES
Owner MILLER STANLEY MARK
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