CDS Structural Assessment & Demolition Methods Flashcards
6 cards from real CDS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CDS Structural Assessment & Demolition Methods flashcards as text
Which excavator attachment is specifically designed to crush reinforced concrete and separate rebar from aggregate?
Answer: Concrete Pulverizer (Cracker)
Concrete pulverizers (crackers) are hydraulic attachments mounted on excavators that crush concrete and separate rebar from aggregate for recycling.
Why is vibration monitoring used during demolition near existing structures?
Answer: To ensure ground-borne vibrations do not exceed thresholds that could damage adjacent buildings
Vibration monitoring measures ground-borne vibrations from demolition activities to ensure they remain below regulatory levels that could damage neighboring structures.
What is underpinning, and when is it required during demolition?
Answer: Supporting an existing foundation when adjacent excavation threatens its bearing capacity
Underpinning provides temporary or permanent support to an existing foundation when adjacent demolition or excavation undermines its bearing capacity.
What is the primary function of a temporary shoring system installed during interior demolition?
Answer: Temporarily carry structural loads from elements being demolished to prevent collapse
Temporary shoring carries structural loads — such as floor or roof loads — during the period when load-bearing elements are removed, preventing premature collapse.
What is the recommended demolition approach when work must occur within 6 feet of an occupied building?
Answer: Hand or robotic selective demolition with protective debris barriers
When demolishing within 6 feet of occupied buildings, hand or robotic selective demolition with protective barriers minimizes vibration, noise, and debris risk to occupants.
What does the term 'fall zone' mean in the context of structural demolition?
Answer: The designated area where debris from a demolition is expected to land during collapse
The fall zone is the area established around a demolition site within which debris is expected to fall, requiring exclusion of all unauthorized personnel.
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