Emergency exit

An emergency exit is more than a door. It is a central element of preventive fire protection and safe evacuation. In existing buildings, infrastructure, and facilities it must be reliably accessible, identifiable, and functional at all times. As soon as interventions in the structure take place – such as during concrete demolition and deconstruction, during gutting works and cutting, or in rock excavation and tunnel construction – the emergency exit comes into focus for planning and execution. Controlled procedures for creating or adapting openings play a decisive role. Tools such as concrete pulverizers or hydraulic wedge splitters, powered by suitable hydraulic power packs, enable precise and low-vibration work steps when emergency exits must be created, widened, or temporarily relocated. In parallel, compliance with applicable requirements and a structured permit-to-work process ensure that evacuation capability is maintained throughout all construction phases.

Definition: What is meant by an emergency exit?

An emergency exit is a specially designated exit that, in the event of danger, enables a fast, safe, and as barrier-free as possible escape to the outside or into a secured area. It is part of the system of escape routes and must be openable without aids – typically from the inside with a single hand movement. Emergency exits must be kept clear at all times, clearly marked, and in many uses equipped with emergency lighting. Dimensions, door swing, and integration into fire-protection concepts depend on the use and the generally accepted rules of technology as well as the applicable requirements. Specific requirements may vary by country and building type. In practice, low opening forces, intuitively operable hardware, and fail-safe door mechanisms support reliable self-rescue under stress.

Functions and requirements for emergency exits

Emergency exits are intended to enable rapid self-rescue and, through clear guidance, trouble-free operation, and sufficient capacity, minimize the risk to occupants. This results in typical, general requirements:

• Accessible at all times, not obstructed, slip-resistant, and well lit.
• Clearly marked by safety signs; with emergency lighting if necessary.
• Openable from the inside without a key, often with suitable panic functions.
• Sufficient width and height depending on occupancy and use.
• Door swing in the direction of escape, where the use requires it.
• Suitable in terms of fire protection, for example through fire-relevant components and fire stop (sealing) in the vicinity.
• Integration with access control or monitoring systems without impeding free egress in an emergency.
• Durable components suitable for the location, including resistance to weathering for exterior exits.

If emergency exits are newly created or adapted – such as through new openings in walls – careful planning with regard to the structure, use, noise control, and construction sequence is required. In these situations, controlled cutting and splitting methods are an important building block for clean, safe, and dimensionally accurate openings. Prior scanning for reinforcement, post-installed anchors, and hidden services helps avoid unplanned damage and disruptions.

Emergency exits in concrete demolition and special demolition

During deconstruction work, existing escape routes often have to be routed provisionally or newly created. At the same time, vibrations, dust, and noise must not excessively impair the use of adjacent areas. Concrete pulverizers allow piece-by-piece removal of reinforced concrete with good control over breakout edges – helpful for widening openings for emergency exits or removing thresholds. Hydraulic wedge splitters act from boreholes and generate targeted crack formation with low vibrations, which has proven effective when opening thick, reinforced walls. Sequenced dismantling and dust-reduced methods support safe operation in occupied or sensitive environments.

Temporary emergency exits on construction sites

When construction sections are separated, temporary emergency exits and clearly guided escape routes are required. They must be appropriately marked, illuminated, and secured against falls. Temporary solutions should be robust, slip-resistant, and free of edges that make passage difficult. In dust-intensive areas, a combination of enclosure, negative-pressure containment, and pinpoint removal is sensible to avoid impaired visibility in the escape route. Regular functional checks, updated wayfinding as construction progresses, and barrier-free details such as ramps or flush thresholds support reliable interim use.

Creating openings for emergency exits

Creating a new opening follows a structured process. The choice of method must be aligned with wall thickness, reinforcement, vibration sensitivity, and environmental conditions.

1. Survey, measurement, and definition of clear opening dimensions.
2. Non-destructive detection of reinforcement, post-installed anchors, and hidden services in the intervention area.
3. Structural assessment and planning of shoring or underpinning.
4. Preparatory cutting, sawing, or drilling for edge guidance.
5. Controlled removal: by segments with concrete pulverizers or internal splitting with hydraulic wedge splitters.
6. Exposing, severing, and proper handling of reinforcement with suitable cutting tools.
7. Edge finishing, formation of thresholds, and installation of the door and frame assembly.
8. Final sealing, fire-stopping, and detailed threshold design for barrier-free, safe passage.

Emergency exits in tunnel construction and rock

In underground construction, emergency exits serve to connect to safe areas, cross-passages, or refuge niches. The environment is often vibration-sensitive, and space is tight. Hydraulic wedge splitters and rock wedge splitter enable controlled, low-vibration interventions in rock and shotcrete. Where reinforced concrete is present, concrete pulverizers and – for cutting free embedded components – suitable hydraulic cutting tools are used. This makes it possible to produce cross-sections with a precise fit without unnecessarily stressing adjacent structures. This is particularly important in rock excavation and tunnel construction as well as in special operations under confined conditions. Attention to ventilation, water ingress, and continuous monitoring of adjacent linings complements the mechanical approach.

Existing-building refurbishment: retrofitting emergency exits

In refurbishment, emergency exits are often reorganized or added to reflect changed uses. The goal is a minimally invasive approach with high dimensional accuracy. In sensitive existing environments – such as healthcare facilities or live operations – low-dust and low-vibration methods are required. Segment-wise removal with concrete pulverizers and inward splitting on massive components support controlled execution. During gutting works and cutting, the combination of suitable drive technology (hydraulic power packs), clean construction logistics, and precise tool guidance pays off. Phased execution, defined noise windows, and stakeholder coordination maintain continuity of operations and evacuation capability.

Coordination with adjacent trades

The creation of an emergency exit must be coordinated with other trades: door systems, electrical infrastructure for emergency lighting, marking, any fire-protection installations, and surface works. Clear interfaces and a coordinated construction sequence reduce friction and prevent interruptions of escape routes. An interface matrix, joint inspections, and defined acceptance criteria at milestones improve quality and reduce rework.

Safety and occupational safety during execution

In all work on emergency exits, the protection of people has priority. This includes hazard analysis, structural monitoring, and clean site organization. Hydraulic tools must be operated in accordance with the manufacturer’s instructions; lines, couplings, and pressure stages must be checked prior to use. Appropriate personal protective equipment, safe hose routing, and lockout-tagout for energy sources are essential components of risk control.

• Shoring and temporary safeguards before the start of cutting and splitting work.
• Fall protection at new openings; protection against falling objects.
• Dust and noise reduction through suitable methods and tool guidance.
• Keeping provisional escape routes clear and clearly marked during the construction phase.
• Orderly disposal and material logistics so escape routes are not blocked.
• Tool and hose inspection before each shift; pressure relief before changeovers.
• Defined emergency plan on site, including alarm paths and assembly points.

Signage, operation, and maintenance of emergency exits

Emergency exits must be clearly visible and kept functional at all times. This includes regular visual inspections, keeping the door area clear, ensuring the opening function from the inside, as well as checking safety signs and – if present – emergency lighting. Specific inspection intervals and records depend on use and the applicable, generally accepted rules of technology. Provisions should be integrated into operations and documented. Routine function tests with traceable records support compliance and early fault detection.

Materials, wall build-up, and construction details

The choice of method for creating an opening depends on the material and build-up. Reinforced concrete, masonry, natural stone, or shotcrete react differently to cutting and splitting. The aim is a dimensionally accurate opening with load-bearing edges and minimal edge damage. Corner pre-drilling can reduce overcuts and help keep edges intact.

• Reinforced concrete: precise, segment-wise removal with concrete pulverizers, supplemented by inward splitting for greater thickness.
• Masonry: low-vibration openings through controlled splitting and subsequent reworking of bed and head joints.
• Rock and shotcrete: rock wedge splitter for controlled crack guidance; reprofiling with suitable cutting and shear tools.

In heavily reinforced components, exposing and then severing the reinforcement is an essential step. Hydraulically powered cutting tools and the appropriate drive technology (hydraulic power packs) support safe, clean execution. Anchorage zones, edge reinforcement, and embedded inserts must be considered early to avoid unexpected load paths or spalling.

Planning guide for creating openings for emergency exits

The following steps serve as general guidance and do not replace project-specific expert planning:

1. Goal definition: determine the location, width, height, and function of the emergency exit.
2. Analysis of use, pedestrian flow, and building-code-relevant boundary conditions.
3. Structural assessment, definition of shoring, and sequence of components.
4. Method selection: cutting, sawing, drilling, splitting; use of concrete pulverizers or hydraulic wedge splitters according to material and environment.
5. Construction logistics, dust and noise control, guidance of temporary escape routes.
6. Execution, quality control of dimensions, edges, and closing functions.
7. Documentation, signage, staff briefing, and handover to operations.

Typical sources of error and how to avoid them

Common problems include openings that are too narrow, unfavorable door swings, uneven thresholds, or damaged edge zones. These can be avoided if surveying, edge guidance, and shoring are carefully planned and execution uses controlled methods. Insufficiently cut reinforcement can lead to spalling; here, a coordinated interplay of cutting and shearing techniques helps. In addition, escape routes must be kept clear – even during short construction phases. Obstructed signage, inadequate interim lighting, or incompatible hardware with access control are frequent causes of avoidable delays and should be identified in advance.

Examples from the fields of application

In concrete demolition and special demolition, emergency exits are often temporarily relocated and then created in a new position. Concrete pulverizers support dimensionally accurate openings in load-bearing walls with low vibration. In gutting works and cutting, low-dust methods are central so that adjacent areas remain usable and escape routes remain clearly identifiable. In rock excavation and tunnel construction, controlled splitting methods create safe connections to rescue adits. Also in natural stone extraction, clearly marked emergency exits and refuge niches help ensure self-rescue from work areas. In special operations – such as confined spaces or sensitive facilities – precise, hydraulically powered tools and clean process planning are decisive for reliably creating openings and maintaining the function of emergency exits during all construction phases.