#concrete

Six Trees in the Ground, Seven More To Go

Dr.Dprsey and PHF fellows cleanign bricks

On a Saturday morning, the Greensboro Fellows, Dr. Dorsey, and several community members came to the courtyard site to help clean bricks! Together they cleaned about three-quarters of a pallet (roughly 350) worth of bricks. Thank you, Fellows and Dr. Dorsey, it was a great help!

Concrete Pour

Formwork pre-concrete pour

The team finished the formwork, secured the rebar mesh, and taped over the formwork spacers and screws. The slab under the walkway is divided into rectangular pavers, which follow the grid system of the rest of the courtyard, and allow two-inch gaps that correspond with screen and grate placement. This week with the help of contractor, Clyde Fields, the team poured concrete!

Cured concrete before formwork was removed

While waiting for the new trees to be delivered, we began removing the formwork! To make prying the forms out easier, longer pieces of formwork were created at the edges of each rectangular slab piece, with spacers every foot or so.

Crepe Myrtles Arrived!

Thirteen beautiful, single trunk, Natchez Crepe Myrtles arrived on site on a cloudy Thursday morning. The team unloaded all of the trees with the help of 3rd-year students, Mason, and the Bobcat. The trees have grown taller since being tagged at a nursery in northern Alabama! The caliper, or width of the tree trunk, ranges between three and four inches wide. The bottom of the tree canopy is at least six to seven feet tall, allowing people to comfortably wander beneath the canopy.

That Friday morning we, along with 3rd-years and Mason, excavated holes for the first two trees. Considering the size of the site, the trees needed to be planted two at a time before the following holes could be augured. David Hill, AU professor of landscape architecture, arrived to advise and help plant the Crepe Myrtles. The 3rd and 5th-years helped us plant the first six trees! A huge shout out to David for coming from Auburn to assist planting the first half of the new courtyard trees.

Old Bricks, New Concrete

People standing in front of screens

For a while now the team has known what materials will be used as in-fill for the screens, but it wasn’t until recently that they were able to see the rope, cable, and galvanized screen together on site! Before the new students arrived, Caleb and Claudia started testing the rope pattern. Four vertical strands were weaved through the screen perforations in a sewing-like pattern and fastened at the bottom of the first and last segment. As well as the stainless steel cables that will run every fifth perforation, in between the rope.

Concrete Curb

This semester started out with the new 5th-year students on site helping the team with formwork, batter boards, and brick rescuing! In the images above, you can see the students making the formwork to hold the concrete in place while it sets, staking it to the ground, and eventually pouring concrete in it. There are four threaded rods that were cold poured into the curb, that will function as anchors for the new pump cover.

“Construction Lines”

Strings in front of metal structures

In preparation for the site being graded again, the students set up guides to know where the edges of the brick pad will be. These strings are ten inches away from the metal screens. Consequently, creating a symmetrical edge on three sides, lining the pad up with the overall grid, and giving the vines that will be planted on the screen some buffer space.

Every Brick Counts

Students cleaning off bricks
Students salvaging and cleaning buried bricks
Stack of cleaned bricks

Before the dirt pile from the previous excavation got removed from the site, it was scoured for any useable bricks. Since the pad will be made up of reclaimed bricks, most bricks found on site are a great addition to the inventory. The students used brushes, hammers, and scrapers to remove any mortar from the bricks before starting a “clean” brick pile.

Bolted Down, Moving Up

While the concrete set, we created templates to help install the threaded rod into the footings. A laminated template ensured the holes drilled into the concrete for the threaded rods were in the correct location. The wooden template held the rods in place while the epoxy dried.

The team used the handy-dandy batter boards and plumb bob to find and mark the exact center of where the footing plates would be installed. They needed to ensure footings were spaced exactly 10 feet apart while also lining-up with the critical connection points of the walkway. Although the footing plate holes were oversized in comparison to the 5/8 inch threaded rods that attach the plates to the concrete, the rest of the screen assembly did not have as much tolerance. The tolerance at the footing plates allowed for minor adjustments as the screens were being connected and leveled to each other.

Before the holes were filled with epoxy, all of the threaded rods were marked (the depth they needed to be embedded) to ensure air bubbles in the epoxy weren’t holding the rods out of place. Nuts were threaded to support the wooden template that holds the rods in place while the epoxy dried. Once the epoxy hardened, the footing plates could be lifted into place and re-leveled in relation to other plates.