140 likes | 607 Vues
Retaining Wall Construction Building A Timber Retaining Wall. Developed by: Dr. Teri Hamlin Georgia Department of Education. Timber Retaining Wall. To level a steep slope Enclose an area for a decorative garden Elevate Beds. Which wood?.
E N D
Retaining Wall ConstructionBuilding A Timber Retaining Wall Developed by: Dr. Teri Hamlin Georgia Department of Education
Timber Retaining Wall • To level a steep slope • Enclose an area for a decorative garden • Elevate Beds
Which wood? • Treated pine and hardwoods are good choices for a timber retaining wall. • Avoid old railway timbers as these are treated with creosote, which harms some plants and heavy to work with. • Also need reinforcing rods secure the structure.
Steps: • Cut a beveled trench into the slope, wet the trench and tamp it well.
Steps • Set the first timber in place and level it. • This course will be completely buried in the ground.
Steps • The timbers are installed in a pattern similar to a brick wall with the butt ends of timbers in one course offset from those in the courses above and below.
Steps • Set a second timber on top of the first and bore a hole through the two timbers. • Use a heavy-duty drill with an extension bit. • A small bit burns out on long holes such as these. • Drive a reinforcing rod through the holes into the ground to hold the timbers firmly together.
Steps • In addition to the 15 degrees inward slope of the wall, vertical stability is achieved by installing tiebacks. • These are single timbers inserted perpendicularly from the face of the wall into the soil backfill to a distance equal to their height above the base of the wall.
Steps • Continue to lay the timbers • staggering the joints from one course to the next • Drill holes and use a reinforcing rod to pin each timber to the one below on each side of every joint. • Cut timbers with a sharp chain saw, and wear goggles to protect your eyes from flying chips.
Steps • Backfill where necessary. • For drainage, • Drill weep holes along the wall's length • Drill a row of holes above the ground
Steps • Fill the cavity. • You can top off the terraces with plantings or mulch.