Curves, Outside Curve, Positive Connection

Outside Curve With Positive Connection

Gravity (PMB) Precast Modular Blocks (PMB) or Segmental Retaining Wall (SRW) systems are structures that use the MagnumStone™ unit weight combined with crushed clear gravel infill to resist the earth pressures behind and on top of the retaining wall. With MagnumStone’s gravity retaining wall extender units fortifying the base of the structure, gravity walls can be built taller with gravity extenders anchoring the base courses in 2ft. (0.6m) and 4ft. (1.2m) increments.

The 1” (25.4mm) / unit 2.4 degree batter or setback of the MagnumStone™ wall along with proper soil conditions below and behind the wall provide an excellent structural stability.

For walls 3.0ft (0.9m) and taller, it is strongly recommended that a qualified engineer be consulted. Some counties may require permits.

Key Considerations for Foundations & Base Preparation

Excavation
Removal of unwanted soils
Compaction Density/Specifications
Leveling Pad Construction
Gravel/Stone/Concrete Recommendations to Build On
What Wall Design Engineer Needs to evaluate/consult on (thickness of leveling pad, where drainage goes, etc.)
Leveling Pad Width Recommendations
Design (Construct) as per the wall designer engineer’s plans
Leveling Pad Placement & Compaction
Place First Blocks Directly on Leveling Pad

STEP

Outside Curve With Positive Connection

Quick Steps

Remove the Screed Pipes from the levelling pad
Place a steel stake at either end of the leveling pad to establish where the back of the first course of units will be
Tightly secure a string line to the stakes at either end, which will provide guidance to line up the back of each MagnumStone™ base unit in a straight line
The MagnumStone blocks should begin at a fixed point in the retaining wall. This includes the lowest point of elevation, a 90-degree corner or an abutment to another structure
Place each unit on top of the leveling pad in such a way as not to disturb the level gravel
Each block should be placed in direct contact with adjacent blocks, pressed as tightly together as possible to ensure there are no gaps between the blocks