Personnel of the Industrial Forestry Operations group designed and constructed a simple two-panel, 18 ft length stress-laminated bridge with the following dimensions: 8 in. deep, 18 ft long, 4 ft wide. All lumber was sawn, drilled, assembled and then transported to the field. Cost estimates are provided in Table 4.

50 hrs transport, measuring, drilling ,assembling @ $12.50/hour	$625
12 hrs for transport, installation	$ 150
8 hrs of backhoe work at $50/hour	$ 400
Lumber	$ 300
Threaded rod, nuts, bolts	$ 300
Total	$1775
TABLE 4. Estimated costs for the construction of the 18 foot lumber stress-laminated bridge.

 

 

 

 

 

Figure 5 shows a close-up of the end of one of the panels and Figure 6 shows the panel being pulled into place using a backhoe. An 8 in. x 8 in. cant was used to support each end and spikes were used to hold the panels in place.

Figure 5. Close-up of 2 inch x 8 inch
lumber stress-laminated bridge panel.

Figure 6. Installation of the 18 foot llumber
stress-laminated bridge panels.