Construction Procedures

All the components required for complete on-site erection of a T-WALL® structure are supplied and delivered to site by Shaw Precast Solutions. A Shaw Precast Solutions representative is available at the start of wall erection to provide hands on technical assistance. An overview of the straightforward construction steps for a T-WALL® structure follows:

FOUNDATION PREPARATION

The foundation is prepared by grading level and proof rolling the area where the T-WALL® units are to be placed. Unsuitable materials below subgrade are removed and replaced with compacted granular backfill.

LEVELING PAD

A nonstructural, non-reinforced concrete leveling pad is placed along the line of the wall face to provide a working platform for placement of the T-WALL® units. A chalk line is established on the leveling pad to mark the front face of the wall.

FIRST T-WALL® COURSE

Staring at a fixed point such as a corner of the wall or an existing structure the first course of units is set using the chalk line on the leveling pad to line up the front faces.

BACKFILLING

Prior to initial backfilling a 300mm wide filter fabric is cut into lengths equal to the height of the wall at each vertical joint. These strips are placed across the vertical joints between the units to prevent migration of the backfill material through the joints. The Backfill material is dumped directly on the tops of the stems to fill both sides equally and prevent lateral movement of the unit. The backfill is compacted in 300mm lifts.

SUBSEQUENT T-WALL® COURSES

Joint material is placed in the horizontal joints between the units at the front face to prevent concrete to concrete contact and to act as a gasket against loss of fines through these joints. Precast shear keys are placed in the blockouts in the top of the stems to provide an alignment guide and prevent movement of the units during backfillling. Backfilling and compaction of each lift of T-WALL® units is completed before the next course is started.

VERTICAL T-WALLS LEVEL EMBANKMENT
Distance WALL HEIGHT (mm)
from top of 2286 3048 3810 4572 5334 6096 6858 7620 8382
Course wall (mm) STEM LENGTH (mm)
1 762 1219 1219 1219 1219 1219 1219 1219 1219 1219
2 1524 1219 1219 1219 1219 1219 1219 1219 1219 1219
3 2286 1829 1829 1829 1829 1829 1829 1829 1829 1829
4 3048 1829 1829 1829 1829 1829 1829 1829 1829
5 3810 2438 2438 2438 2438 2438 2438 2438
6 4572 3048 3048 3048 3048 3048 3048
7 5334 3048 3048 3048 3048 3048
8 6096 3658 3658 3658 3658
9 6858 4267 3658 3658
10 7620 4267 4267
11 8382 4877

 


VERTICAL T-WALLS SLOPED EMBANKMENT
Distance WALL HEIGHT (mm)
from top of 2286 3048 3810 4572 5334 6096 6858 7620 8382
Course wall (mm) STEM LENGTH (mm)
1 762 1219 1219 1219 1219 1219 1219 1219 1219 1219
2 1524 1219 1219 1219 1219 1219 1219 1219 1219 1219
3 2286 1829 1829 1829 1829 1829 1829 1829 1829 1829
4 3048 2438 2438 2438 2438 2438 2438 2438 2438
5 3810 3048 3048 2438 2438 2438 2438 2438
6 4572 3658 3048 3048 3048 3048 3048
7 5334 3658 3658 3658 3658 3658
8 6096 4267 4267 4267 4267
9 6858 4877 4877 4877
10 7620 5486 5486
11 8382 6096