Measurand ShapeArrays can be installed horizontally to measure vertical displacement. The procedure for horizontal installation is the same regardless of the model of ShapeArray being used. This installation method requires lengths of 60 mm (2.3") OD, 49 mm (2.0") ID PVC conduit to be assembled, the SAA Horizontal Install Kit, and the ShapeArray to be pulled through. More detailed instructions for horizontally installing each type of ShapeArray are available in their respective manuals:
- Recommended Installation Method for Horizontal SAAF
- Recommended Installation Method for Horizontal SAAX
Step 1 - Prepare the Trench
Dig a trench long enough to hold the ShapeArray. It must be at least 300 mm (1') deep by 300 mm (1') wide. Line the trench with geotextile. Ensure that the geotextile is wide enough to line the trench and wrap over top of the sand, completely enclosing it at the end of the process. Fill the trench with at least 150 mm (0.5') of bedding sand.
Figure 1: ShapeArray trench must be 300 mm (1’) deep by 300 mm (1’) wide.
Step 2 - Assemble the PVC Conduit
Clean and deburr the PVC conduit. Place the ShapeArray reel on a stand such that it unreels from the bottom at one end of the trench. Lay out PVC conduit in the trench. Run a length of rope along the inside of each piece of conduit. Glue and assemble the conduit.
Figure 2: Lay out the PVC conduit in the trench, run a rope through the conduit, and glue the conduit together.
NOTE: The Horizontal Install Kit cannot fit over a coupler. If the conduit has bell ends, remove the bell end from the segment of the conduit closest to the reel by cutting it, making sure to deburr the conduit.
Step 3 - Pull the ShapeArray Into the Conduit
Attach the rope to the eyelet on the end of the ShapeArray and pull it into the conduit. Attach the included end cap.
Figure 3: Pull the ShapeArray into the conduit.
Step 4 - Attach the Horizontal Install Kit
Trim the PEX on the ShapeArray such that 100 mm (4") to 125 mm (5") of the PEX is protruding from the conduit. Ensure the compression rings / pipe clamps are loose on the Horizontal Install Kit, and slide it over the cable and the PEX and onto the conduit. Tighten the compression rings / pipe clamps to secure the Horizontal Install Kit to the conduit.
Figure 4: Attach the Horizontal Install Kit.
Insert and tighten the set screws into the Horizontal Install Kit. Tighten the cable gland on the top of the Horizontal Install Kit. Run the cabling to the data acquisition system (DAS) and connect to a data logging solution.
Step 5 - Fill and Cover the Trench
Cover the ShapeArray with at least 150 mm (0.5') of bedding sand and add fill to cover the trench.
Figure 5: Fill the trench with bedding sand and then cover it over with fill.