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CON/CNE 271 Construction Safety First Name______________________Last Name__________________
Homework #4 – Timber Bracing Problem
Identify the correct table for Timber Trench Shoring provided in the handout from the OSHA Construction
manual in Appendix C of Subpart P – Excavations, then
a) Select the proper timber bracing materials (nominal sizes – S4S) for cross braces, wales, and uprights for
use in a Type C classified soil. All spacing in problem statement and tables is measured center to center.
(6)
The following parameters are known:
• depth of the trench is expected to be 9 feet
• width of trench is to be 4 feet
• vertical spacing for both the cross braces and the wales is 5 feet
• horizontal spacing for the cross braces, also known as struts, is 7 feet
Cross braces
_________
Wales
_________
Uprights
_________
b) Sketch timber shoring layout below. (4)
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