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: retem@retemsteel.com