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

 

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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