Which method of protection involves vertical sidewalls with horizontal struts? A. Trench boxes B. Sloping C. Benching D. Spoiling
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Answer

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Step 1:
I'll solve this problem step by step:

Step 2:
: Understand the Protection Methods

Protection methods in excavation safety are designed to prevent cave-ins and protect workers in trenches and excavations.

Step 3:
: Analyze the Description

The problem describes a protection method with: - Vertical sidewalls - Horizontal struts (supports crossing the width of the trench)

Step 4:
: Evaluate the Options

A. Trench boxes: These are rigid structures with vertical sides and horizontal cross-braces that protect workers by preventing soil collapse B. Sloping: Involves angling the trench walls at a safe slope to prevent collapse C. Benching: Creates step-like horizontal cuts in the trench walls D. Spoiling: Refers to removing excavated material from the trench site

Step 5:
: Match the Description

The description precisely matches the characteristics of trench boxes: - Vertical sidewalls ✓ - Horizontal struts ✓

Final Answer

Trench boxes Explanation: Trench boxes are protective systems with vertical sidewalls and horizontal cross-braces designed to prevent soil cave-ins and protect workers during excavation activities.