Retrofit

Retrofit describes the professional addition or conversion of existing plants, machines, and structures to fulfill new tasks, achieve safety and environmental standards, or increase efficiency. In the context of concrete demolition, special demolition, strip-out, and rock excavation, it is often about equipping carrier machines with additional hydraulic attachments or adapting existing structures so that interventions can be carried out selectively, with low vibration, and in a controlled manner. Tools such as concrete demolition shears as well as rock and concrete splitters from Darda GmbH play a central role because they enable precise interventions in heavily reinforced components and in massive rock — with high control and reduced emissions.

Definition: What is meant by retrofit

Retrofit means the subsequent outfitting of machines, equipment, or structures with additional functions, components, or safeguards. The goal is to adapt to new uses, changed regulations, or more demanding work processes. In practice, this includes, among other things:

• the retrofit of carrier machines (e.g., excavators, demolition robots) with hydraulic interfaces, quick couplers, or control functions for attachments such as concrete demolition shears, combination shears, steel shears, multi cutters, tank cutters, and rock splitting cylinders,
• the structural retrofit of existing constructions to create openings, relieve components, introduce strengthening, or deconstruct selectively,
• the power and media supply using suitable hydraulic power units, especially in interior demolition or for special operations with limited infrastructure.

Fields of application and objectives of retrofit in demolition and conversion

Retrofit in deconstruction and conversion projects serves to precisely align work methods with the boundary conditions. Typical objectives are:

• Selectivity: local interventions without transferring vibrations to adjacent components (e.g., with rock and concrete splitters),
• Safety: controlled releasing of reinforced concrete with concrete demolition shears, minimized spalling and flying debris risks,
• Emissions control: reduced noise and dust generation, useful for strip-out and interior demolition,
• Process performance: rapid work through appropriate hydraulics, coupling systems, and matched gripping or cutting forces,
• Resource conservation: adapting existing carrier machines instead of procuring new ones; material-sparing deconstruction.

Retrofit of carrier machines for hydraulic attachments

For attachments to work reliably and safely, carrier machines must have appropriate hydraulics, mechanics, and controls. The key points:

Hydraulic interfaces

• Pressure and return circuits with adequate sizing; the flow rate must match the tool.
• Case drain routing if required, to keep system temperature and sealing stability under control.
• Sensitive control for precise gripping, splitting, cutting — important with concrete demolition shears and combination shears.

Mechanical connection

• Adapter plates and quick couplers compatible with the carrier machine and the tool configuration.
• Consider load capacity and tipping moment; tools must not exceed permissible loads.
• Check swing or rotation drives (if present) for torque and torsion.

Power supply and power packs

• Hydraulic power packs for situations without on-board hydraulics, e.g., in interior demolition or sensitive areas.
• Select the power supply according to the operating environment (e.g., electric in enclosed spaces, low-emission).

For assignments such as strip-out and cutting or concrete demolition and special demolition, concrete demolition shears have proven effective because reinforcement can be cleanly exposed and component layers removed step by step. Rock and concrete splitters create controlled separation joints in massive components and in rock, allowing large elements to be segmented without impact or blasting vibrations.

Structural retrofit in existing buildings: openings, strengthening, deconstruction

In existing structures, retrofit stands for the safe adaptation of load-bearing systems. Typical tasks:

• Creating openings in walls and slabs with reduced vibration: first produce splitting channels with rock splitting cylinders, then release in a controlled manner.
• Exposing reinforcement with concrete demolition shears to implement directional or cross-section adjustments.
• Relieving components by sectional removal and temporary shoring.

Selective deconstruction in sensitive environments

In hospitals, laboratories, historic buildings, and densely built-up neighborhoods, reduced vibration, dust, and noise are crucial. Here, rock and concrete splitters and finely controllable concrete demolition shears help because they act locally and without percussive energy.

Areas of application: From strip-out to rock excavation

Retrofit is relevant in various areas of application:

• Concrete demolition and special demolition: retrofit tools on excavators and demolition robots, remove components layer by layer.
• Strip-out and cutting: provide hydraulic power packs, use concrete demolition shears for precise separations, Tank Cutter and steel shears for metallic structures.
• Rock excavation and tunnel construction: rock and concrete splitters to separate without blast-induced vibration; consider axial and transverse pressing.
• Natural stone extraction: splitting cylinders for raw block recovery and controlled fractures.
• Special operation: work with low-risk methods, for example low-spark cutting or in areas with restrictive emissions requirements.

Technical design: pressure, flow, control

The hydraulic design must match the tool. Important are a stable hydraulic pressure, the required flow rate, and suitable valve technology. For concrete demolition shears, combination shears, and multi cutters, finely metered proportional control is advantageous. For splitting cylinders, reliable pressure generation and safe holding functions are decisive. Hydraulic power packs should tailor performance, cooling, filtration, and power supply to the intended use.

Compatibility and adapters

Adapter plates, quick couplers, and couplings must match mechanically and hydraulically. Unified coupling systems simplify switching between concrete demolition shear, steel shear, and tank cutter and reduce setup times.

Occupational safety and boundary conditions

Safety takes priority. In addition to hazard analyses, safety distances, load pick-up points, and structural behavior must be considered. For retrofit, the following aspects are essential:

• Load-bearing capacity and stability verification for carrier machines and structural components.
• Emissions control: dust suppression, noise reduction, vibration monitoring.
• Power and media management: safe routing of hoses, protection against crushing and abrasion.
• General legal requirements: depending on the project, additional requirements may apply; compliance must be checked on a project-specific basis.

Process steps: This is how retrofit becomes plannable

1. Requirements analysis: record component, material, reinforcement, environment, accessibility, and target quality.
2. Tool and carrier machine selection: define concrete demolition shears, rock and concrete splitters, or other attachments appropriate to the task.
3. Hydraulics and adapter planning: specify circuits, couplings, quick couplers, power packs.
4. Trial step: small test area to confirm performance, emissions, and quality.
5. Execution: step by step, with ongoing monitoring of structural behavior and hydraulic parameters.
6. Documentation: evidence of the equipment used, measurement data, changes, and results.

Quality assurance and documentation

The quality of a retrofit is reflected in repeatable results, low wear, and consistent working performance. Sensible measures include:

• Checklists for assembly, hydraulic tightness, and control functions,
• Measurement logs (e.g., emissions and temperature values),
• Maintenance plans for tools, hoses, couplings, and power packs.

Environmental and sustainability aspects

Retrofits can conserve resources: existing carrier machines remain in service, and low-vibration methods such as splitting reduce secondary damage. Selective deconstruction facilitates clean separation of construction materials. Indoors, hydraulic power packs with suitable power supply enable low-emission work.

Typical pitfalls and how to avoid them

• Insufficient hydraulic performance: leads to low working speed — check flow rate and pressure early.
• Lack of compatibility: coordinate adapters and couplings in good time; standardize quick couplers.
• Overlooked structural behavior: monitor crack patterns and stress redistributions during removal, especially in heavily reinforced zones.
• Emission risks: plan for dust, noise, and vibration; combine splitting and shear techniques in a targeted way.

Retrofit in special operations

In sensitive facilities and confined conditions, projects often require specially matched tools. Tank cutters, steel shears, and multi cutters can be retrofitted via suitable power packs and adapters to cut metal components in a controlled manner. In tunnels and for rock excavation, splitting cylinders are used when low-vibration methods are required.

Lifecycle: maintenance and continuous optimization

After commissioning, regular maintenance, oil care, seal inspections, and retightening of mechanical connections ensure availability. Continuous optimization — for example, improving coupling logic, hose routing, and tool changeover times — increases cost-effectiveness and process safety over the entire lifecycle.