Structural Collapse Rescue — Shoring, Breaching, and Victim Removal

Structural Collapse Rescue — Shoring, Breaching, and Victim Removal

When a building partially collapses, the remaining structure is unstable. Firefighters operating in collapse zones must stabilize the void before entering it, create a safe access opening if one does not already exist, and remove victims without triggering secondary collapse. This lesson covers the three core skills: shoring, breaching, and victim packaging and removal.

Why Structures Collapse and Why That Matters

Collapse can result from fire weakening structural members, earthquake, explosion, flood undermining foundations, or construction failure. After the initial collapse, void spaces form — pockets where victims may survive. Those voids are fragile. The weight that was once carried by fallen members has been redistributed, often onto debris piles. Any disturbance — vibration, water application, or personnel loading — can trigger secondary collapse. Your first job is to recognize this danger and not add to the load.

Before entering any void, assign a collapse-zone safety officer, establish a warning signal (usually an air horn), and evacuate the work area immediately if you hear cracking, popping, or settling sounds.

Timber Shoring Fundamentals

Shoring transfers the load of an unstable overhead element to the ground through a timber assembly. The two most common configurations in firefighter-level rescue are the vertical (post) shore and the horizontal shore used to stabilize a doorway or window opening.

Vertical post shore components:

• Footer board — distributes load on the ground; a flat 4×8 or 4×4 plank prevents the post from punching through debris.
• Post — a 4×4 timber cut to within about 1–2 inches of the gap height.
• Header board — sits between the post top and the overhead surface to spread load.
• Wedges — a pair of opposing wooden wedges driven between the post top and the header to take up the remaining gap and create a snug, plumb fit.

Building a vertical shore — step sequence:

1. Measure the clear height of the void at the shore location.

2. Cut the post so that two wedges (stacked thin-end to thin-end) will fill the remaining gap.

3. Place the footer board flat, centered under the load point.

4. Stand the post plumb — use a level or the trained eye along two perpendicular faces.

5. Place the header board between the post top and the overhead surface.

6. Drive wedges from opposite sides simultaneously so the post rises evenly; stop when snug, not forced.

7. Call "shore complete" and allow the instructor to apply a lateral load test before proceeding.

A shore that shifts under hand pressure has failed. Recheck plumb, re-drive wedges, or recut the post.

Breaching CMU Block Walls

Concrete masonry unit (CMU) block walls are common in commercial and residential construction. Breaching creates a victim-access opening when doors and windows are blocked. For rescuer and victim passage, a minimum opening of approximately 24 inches wide by 24 inches tall is the working standard used in technical rescue training.

Selecting the breach location is critical. Always breach a non-load-bearing wall segment. Avoid corners, pilasters, reinforced columns, and areas directly below heavy overhead loads. The instructor will mark the breach location; never deviate from the marked area without instructor approval.

Breach procedure:

1. Don full PPE: structural helmet with face shield, structural gloves, knee pads, and safety glasses under the face shield.

2. Score the mortar joints around the marked opening with the rotary hammer and chisel bit.

3. Remove individual blocks from the center of the opening outward — never start at an edge block, which may be tied into the adjoining structure.

4. Control each block as it comes free; set it aside quietly rather than dropping it. Dropped blocks vibrate the structure and can shift the victim.

5. Clear debris to the exterior side so it does not accumulate inside near the victim.

6. Stop and reassess if you hear structural movement.

Victim Packaging in a Confined Void

Inside a collapse void, space is severely limited. Spinal precautions are applied whenever the mechanism of injury (falling debris, fall from height) is consistent with spinal injury — which in structural collapse it almost always is.

Packaging sequence:

1. Maintain manual in-line stabilization of the head and neck throughout.

2. Apply a correctly sized cervical collar.

3. In a confined space, use a Sked stretcher or a short backboard to immobilize the torso before moving the victim.

4. Secure the victim to the device with straps at the chest, hips, and legs; secure the head last.

5. Confirm no straps are over the airway or will snag on debris during removal.

Hands-and-knees pass-out — used when the breach opening is low:

• Rescuers inside the void guide the packaged victim feet-first toward the opening.
• Rescuers outside receive the victim, supporting the weight continuously.
• Never allow the victim to hang unsupported in the opening; the rescuer-to-rescuer handoff must be smooth and commanded verbally.
• Once outside, transfer to a long backboard on a stable surface, maintaining spinal alignment throughout the log-roll or lift.

Safety Rules for This Lab

• No one enters the void until the instructor verifies the shore.
• Keep bystanders and uninvolved students outside the collapse hazard zone boundary.
• Rotary hammer use: two hands on the tool at all times; tool is de-energized before changing bits (equivalent to lockout/tagout discipline on hand-carried power tools).
• Call the air-horn signal immediately if anything shifts; all personnel exit before re-evaluating.
• Lift with your legs when handling timber; 4×4 lumber is heavy — use a team lift for lengths over 6 feet.