Conjet - Water Jetting Machines for Concrete Removal

Conjet AB designs, develops and manufactures remotely operated, computer controlled high-pressure water jetting machines, which selectively remove concrete damaged by salt and frost from numerous structures using a method known as hydrodemolition. This process can be applied to bridges, tunnels and multi-storey car parking decks and many other kinds of road infrastructure.

The firm makes an extensive range of robots, including the very latest Conjet Robot 322, which has just been added to the product range. Conjet Robots are now available in cutting widths up to 7m, can remove concrete to depths of up to 500mm and can blast away between 0.5m³/h to 1.5m³/h, depending on the machine and strength of concrete.

REMOTELY-OPERATED HYDRODEMOLITION MACHINES

Out-dated concrete-removal techniques using pneumatic and hydraulic breakers or road milling machines are universally accepted as being inefficient and even damaging to the structure being repaired - they remove and leave both good and bad concrete and cause damage to the remaining healthy concrete and steel reinforcement.

High-pressure water jet equipment, on the other hand, can selectively remove different layers of concrete and does not cause any new damage to the roughened surface or create micro cracks in the remaining healthy concrete. Furthermore, the bonding of the water-jetted interfaces is twice as strong as those prepared by mechanical chipping.

ROBOT HIGH-PRESSURE WATER JETTING EQUIPMENT

Conjet Robots have been successfully proven in road traffic structures worldwide. We have designed the following range of PLC (Programmable Logic Circuit) controlled robots for various applications:

• Conjet Robot 322: compact water jetting machine; weighing only 1t, the 332 has been designed to work in confined spaces and areas inaccessible to larger hydrodemolition machines
• Conjet Robot 363 Std: designed for concrete removal on walls, ceilings and horizontal surfaces; the unit is small enough to enable easy manoeuvres under difficult conditions
• Conjet Robot 363 MPA: likewise designed for walls, ceilings and horizontal surfaces, the 363 MPA features a Multi Purpose Arm that allows the cutting head to reach further up and down than previously possible
• Conjet Robot 432D, Diesel: designed for large-scale concrete removal of horizontal surfaces; this unit is easy to manoeuvre in relatively tight areas despite its size and weight (3,500mm x 1,800mm; 2,500kg) - the unit can handle 1,100kW (1,500hp) pump capacity and will achieve a removal rate of more than 2m³/h

JETFRAME SYSTEMS FOR CONCRETE-REMOVAL WORK IN INTRICATE CONDITIONS

Conjet has designed two major PLC controlled JetFrame systems for various applications.

Conjet Jetframe 102: a high-pressure water jetting machine recommended for use when the Conjet robot, for various reasons, cannot access the surface that needs to be removed. The remotely operated Jetframe 102 replaces dangerous work such as jack hammering and hand lancing in confined areas, can be mounted and demounted easily at the site and is electrically driven in order to protect the operator from exhaust inside a building.

Conjet Jetframe 122: a flexible, lightweight remotely-operated high-pressure water jetting machine, the Jetframe 122 can be fixed to the concrete surface being repaired or mounted on a sky lift access platform or other similar long-reach equipment. This system can operate on a variety of horizontal, vertical and angled surfaces, including dam faces and on the underside of bridge decks.

Both Jetframe systems are operated from an electro-hydraulic Computer Controlled Unit Conjet CCU 197 power unit. The CCU 197 is exceptionally light and manoeuvrable and is ideal for working in confined areas and on scaffolding and access platforms.

TAILOR MADE SYSTEMS

Conjet can also provide tailor made systems on request. For further information, please visit our website at the address below.