In general the top of the stem of any cast concrete retaining wall should not be less than 12 inches for the proper placement of concrete.
How to design retaining wall concrete.
Refer to the plan or schematic for the retaining wall.
Then use the marking paint and measuring tape to lay.
Compute resisting moments based upon the assumed footing width calculated about the front edge of the footing.
Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider.
Scrape off excess mortar.
Normal loading static earth pressure water pressure pressure due to live loads or surcharge.
Once the first row is installed pack native soil to grade level on both sides of this course to anchor the wall in place.
Build the footing and insert rebar into the wet concrete.
Build and prep footing.
Install the first course of blocks using a taut string line to establish a straight row.
For a trial assume the footing width to be about 1 2 to 2 3 s the height of the wall with 1 3 being at the toe.
Level to level blocks lengthwise and a torpedo level to level the front to back.
Sketches of the retaining wall forces should be considered to properly distinguish the different forces acting on our retaining wall as tackled in the previous article retaining wall.
Your retaining wall design will determine how you mark the area.
In general the resulting design pressure for earth retaining structures should not be less than the pressure due to a fluid of unit weight 5kn m 3.
How to pour a concrete retaining wall.
Lay out the wall and excavate the slope and the footing trench.
For straight lines mark the entire bed area with stakes string and marking paint.
The construction process for these decorative walls involves setting the forms installing form liners inside the forms this provides the texture pouring colored or plain concrete then stripping the forms and staining the concrete to look like stone or masonry.
Concrete retaining wall footing size the depth to the bottom of the base slab should be kept at a minimum of two feet.
The basic pressure loading to be considered for the design is.
Measure and mark footing locations.
To mark a free form layout use a rope or hose to outline the shape.