Monitoring unstable structures in USAR operations : how to keep teams safe from collapse risks ?
How can rescue teams be effectively protected during interventions in unstable environments, on weakened or partially collapsed structures?
In Urban Search and Rescue (USAR) operations and firefighting interventions, monitoring unstable structures after collapses or fires is a major challenge to protect responders and anticipate secondary collapse risks.
To address these field constraints, LEADER, a manufacturer of rescue equipment solutions, has developed structural movement monitoring tools specifically designed for high-risk environments: LEADER SENTRY and LEADER WASP.
Why monitor weakened structures?
USAR interventions often occur in highly unstable contexts:
• Weakened buildings, damaged load-bearing structures, or unstable constructions
• Areas affected by natural disasters
• Structures degraded by fire
• Confined or hard-to-access environments
Load-bearing elements (walls, slabs, columns, beams) can experience micro-movements imperceptible to the naked eye but critical for safety.
In such situations, even the slightest structural movement can endanger the teams on site.
Implementing dedicated monitoring systems allows for:
• Anticipating collapse risks
• Securing work zones
• Making fast and informed operational decisions
LEADER SENTRY : remote stability controller for unstable structures
The LEADER SENTRY is a portable, autonomous stability control device designed to remotely monitor movements in unstable building structures.
It detects suspicious movements, immediately alerts teams, and helps secure intervention zones.
It is particularly suitable for monitoring damaged buildings, unstable facades, or metallic structures after a disaster.
Two LEADER SENTRY units can be connected simultaneously to monitor multiple critical points, providing extended coverage of the risk perimeter.
How does LEADER SENTRY work?
LEADER SENTRY relies on safe laser telemetry technology capable of continuously detecting the smallest movements of objects or unstable structures.
It immediately alerts teams in case of suspicious activity, offering enhanced protection for responders.
Key features:
• Continuous remote real-time detection:
LEADER SENTRY uses a laser beam to continuously detect movements in damaged buildings up to 150 m away, providing safe monitoring for teams. Its screen displays real-time distance and target information. Alert thresholds can be precisely set. An optional wireless remote allows control from debris up to 100 m away.
• Precise targeting and intelligent filtering:
The system automatically filters out external disturbances (people passing, birds, moving elements), reducing false alarms.
• Continuous vigilance and robustness:
Once locked on a target, LEADER SENTRY continuously monitors the structure, detecting any movement between 2 and 100 mm. Its IP55 rating ensures reliable all-weather operation. With up to 6 hours of autonomy (or 9 hours with lithium batteries), it provides long-term, uninterrupted monitoring.
• Immediate alarm activation:
When movement is detected, LEADER SENTRY triggers a 105 dB audible alarm and three flashing white lights. This dual signal quickly warns teams near the unstable structure, allowing immediate action in case of collapse risk.
LEADER SENTRY uses advanced laser technology to detect, monitor, and report suspicious structural movements in real time. Early detection enables fast operational decisions and directly enhances the safety of intervention zones.
LEADER WASP: ultra-mobile vibration and structural movement detector
LEADER WASP is a structural movement and vibration detector designed to be attached to any surface (load-bearing wall, slab, beam, metal or masonry structure) in any position, allowing intervention teams to make quick decisions to prevent collapse risks.
As the first digital control system specifically developed for emergency interventions, it allows teams to continuously monitor structural changes, even in confined or smoky environments.
It is particularly suitable for rubble zones, confined spaces, and interventions near active responders.
How Does LEADER WASP Work?
LEADER WASP uses advanced seismic and accelerometer sensors capable of detecting the smallest structural movements, vibrations, and rotations (movement, deformation, or stress).
Key features:
• Continuous structural movement detection:
LEADER WASP continuously detects light movements, 3D rotations (0.1°–2.6°), and vibrations (0.5 Hz–100 Hz) with high sensitivity for early detection.
• Audible and visual alerts:
The system has 8 red LEDs and an adjustable siren. Alerts are triggered when preset thresholds are exceeded, with two blinking modes: normal operation or alert.
• Versatile mounting and robustness:
Without a screen for added durability, LEADER WASP can be reconfigured without being removed from the site. With its accessories, it attaches to all surfaces (metal, concrete, glass, wood, etc.) in any position.
• Ease of use:
Lightweight, compact, and quick to install, LEADER WASP enables fast and efficient deployment in the field.
It helps detect potential stability loss before any progressive collapse occurs.
LEADER SENTRY vs. LEADER WASP : complementary technologies
Both LEADER SENTRY and LEADER WASP aim to protect rescue teams by detecting movements in weakened structures.
However, their usage differs depending on intervention conditions:
These technologies complement each other in emergencies:
• LEADER SENTRY with its laser is ideal for remote monitoring indoors or outdoors, at short or long distances, especially effective during fires and rescue operations.
• LEADER WASP is perfect for smoky or confined spaces, providing close-range monitoring directly on the structure.
Used together or separately, they provide full protection, allowing rescue teams to work safely in sensitive zones by detecting even the smallest movements.
When to use LEADER SENTRY and LEADER WASP in emergencies
Depending on intervention conditions, these devices can be used independently or simultaneously:
• Unstable structures after disasters: natural disasters (floods, storms, landslides), collapses, rubble searches
→ LEADER SENTRY + LEADER WASP
• Fire interventions: monitoring before engagement, real-time detection during operations, post-incident structure control
→ LEADER SENTRY + LEADER WASP
• Construction and inspection work: monitoring buildings under construction, tunnels, underground galleries, mines
→ LEADER SENTRY + LEADER WASP
• Road accidents: monitoring movements of bridges, road structures, or unstable vehicles
→ LEADER SENTRY + LEADER WASP
• Confined environments: collapsed buildings, roofs, hard-to-access debris zones
→ specific to LEADER WASP, attached directly to the structure
By combining remote monitoring and close-range detection, LEADER SENTRY and LEADER WASP provide complete protection for USAR teams against collapse risks.These devices demonstrate LEADER’s commitment, as a rescue equipment manufacturer, to developing reliable, robust tools designed for real operational conditions.
FAQ – Structural monitoring in USAR operations
• Why monitor weakened structures during USAR operations?
To anticipate secondary collapse risks and protect teams on site.
• What is the difference between LEADER SENTRY and LEADER WASP?
LEADER SENTRY monitors structures remotely with a laser, while LEADER WASP detects vibrations and movements directly on the structure.
• Can SENTRY and WASP be used simultaneously?
Yes, they are designed to complement each other for global and close-range monitoring.
