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Retem Applications for Land Stabilization
Leo Toledano – CEORETEM 3D Steel Grid Ltd.
Topics
Retem Grid description and specifications Stabilization with concrete:
– Ditches and water ways– Agricultural canals– Spillways– Inlets and outlets
Stabilization with rock and soil. Advantages of Retem in drainage installations.
Retem Grid description and specifications
The 3-D Steel Grid is a three dimensional web made of galvanized steel deployed on two levels of parallel steel strips linked by oblique ribs without welding points.
3.2 m1.3 m4.16 m2
9.36 kg per unit40 or 80 mm5 mm85 mm
GS350 – Z275350 N/mm2
450 N/mm2
22%1.4 mm
Panel specifications:
• Length • Width • Surface • Weight • Distance between panel levels • Width of ribs • Distance between longitudinal ribs
Steel specifications:
• Galvanized steel type• Yield Strength• Tensile strength• Elongation 22%• Steel thickness 1.4 mm
Pallet of Retem 3D steel Grid panels Pallets of 160 panels – 3.2 x 1.3 cm each. Total area 500 m2, total weight 1.2 tons.
Height varies according to designer requirements from 4 cm to 8 cm. Steel thickness is 1.40 mm. Weight per square meter: 2.25 kg.
Main applications in erosion control
Reinforcement for concrete lining
JK Spillway
Reinforcement for concrete lining
Waterway Construction Method
Retem Panels Brought to Working Site
Worker Laying Panels
Stake Insertion
3D Grid with Pressure Hole
Concrete Filling Requirements
For 4 cm high grid, 8 cm. thick concrete (covering of steel, 2 cm on each side).
For 8 cm high grid, 12 to 14 cm thick concrete (covering of steel, 2 to 3 cm on each side).
Spreading the Concrete
10 Years of ExperienceOver 1,500,000 square meters of lining.
Not a single repair request has been registered.
Ditches in a US Army facility
Flexible Adaptation to Ditch Contour
Ditch on Cracked RockShallow ditch lining prevents water infiltration through cracked rock and weakening of the road pavement.
Narrow Steep Sides
Retem is highly flexible. This allows the building of narrow water works in rural areas.
70 Foot Wide Waterway
Typical Rough Finish Colored Texture
A Rough Finish Retaining Wall
River Bank Protection 3D steel grid flexibility allows to build
reinforcement belts as an integral Part of the construction by folding the grid.
Reinforcement for Concrete Structure
Spillways
Spillways The steel grid provides reinforcement for the chute
and its belts in one monolithic structure.
Inlet and Ditch
Rock Filling on Reservoir Bank
Stabilizing collapsed river banksSeis, Italy, 2000
Slopes under a roadBayern, Germany
3. Vegetalisation (seeds and fertilizers)
2. Inserting stones and soil1. Anchoring the 3D grid
Panel installed for Soil Filling
Same Slope after One Year
Used with anchors and projected concrete, 3D web provides long lasting protection to hewn hillsides.
Outstanding results are obtained by use of Retem 3D grid in erosion prevention. Spillways designed with 3D grid in all lengths and inclinations are built in a single
operation without using wood frames. Can be implemented in the most difficult soil and in the most extreme topography. Fast execution. Large waterways and narrow canals are being stabilized with 3D grid lining. Long-lasting and full protection. No requirements for skilled workers. Low cost of construction. Slopes of very steep inclination are easily treated. No maintenance cost.
3D Grid in Land Stabilization
Other Applications
Panels are held together using staples.Straightened by horizontal reinforcement.Lined on both sides with a steel net.Filled with a concrete pump from bottom to
top.Finished by traditional means.
Building Method
Typical Wall Reinforcement
Internal Partitions
Retem 3D grid at Euro-Disney
3D grid is preformed to radius of the tunnel
The grid is fixed with or without LDPE sheets sealing against water infiltration.
Filled with projected concrete.
Lining is continuous in rock soil.
Lining is made between steel beams in soft soils.
3D Steel Grid in Tunnels
Grid Laying in Tunnel
Finishing Tunnel Lining
3D Grid in Rehabilitation of Old Sewage Conduits
3D grid is preformed to radius of the pipe.Installed against pipe wall qualities.Filled with projected concrete.
Casting Concrete on Sewage Pipe
Houses, walls, and fences using mud, mixtures of mud and straw, or mud and cements may provide cheap housing solutions
3D Grid Filled with Local Materials.
Concrete/Mud Filling for 3D Steel Grid Using mud, mixtures of mud and straw, or mud and cements with a 3D Steel reinforcement may provide
cheap housing solutions in poor areas.
Retem 3D Steel Grid Ltd.P.O.Box 14164 Jerusalem 91141
Tel: 972 2 6283474 Fax: 972 2 6274067
E-mail: [email protected]