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Advantages of a robotic demolition machine

August 1, 2022/in Blog post

 

Machines have completely changed the way we work in most industries in the world, whether we are talking about utilizing a computer in an office environment or a robotic demolition machine in the construction industry. They have indeed made human life easy in most facets. 

The industry where they have arguably made the most difference is the construction industry. As worldwide urbanization continues to grow in the form of new buildings, changes in infrastructure, as well as remodeling of old cities, the need for additional reliable, efficient, safe, and cost-effective construction equipment have continued to grow alongside it. Through the use of different types of machinery, human labor is not only significantly, but also safer. 

Much of the development today is due to a singular machine: the robotic demolition machine. Demolition is generally one of the more dangerous work areas in construction. The new types of demolition robots have played a significant role in constructing new buildings, placing rooftops, renovating bridges and tunnels, among many more.

Types of robotic demolition machines

Robotic demolition machines refer to different types of heavy machinery with the sole purpose of demolishing buildings and other structural elements. Robotic demolition machines usually refer to one of two things:

  • robots with hydraulic breakers; or
  • hydrodemolition robots using high-pressure water.

Benefits of robotic demolition machines

Regardless of the type of demolition machine, the robotic aspect of them provides a host of advantages including:

  • Tremendous power: One of the most evident advantages of robotic powered demolition is the increase in power and efficiency. Even though their size is much more compact than the traditional counterparts, excavators or mechanical jackhammering etc., its power is much greater. Robotic demolition machines are able to work continuously without interruption or break. A hydrodemolition robot from Conjet is, for example, 25x faster than mechanical jackhammering. 
  • Remote-controlled operations: The remote-controlled aspect of demolition robots provide an additional level of control to its features. In addition to greater flexibility and efficiency, it also ensures the safety of the operator as they can control them from a safe distance from the demolition site.
  • Environment-friendly: Robotic demolition robots, hydrodemolition robots especially, are very environment-friendly and are a great solution to many environmental issues contractors face, such as noise and vibrations. 

Robotic demolition machine – Price consideration

Regardless of how many advantages a robotic demolition machine presents, the price will always be an important consideration – as it should be! While we can’t speak for robotic demolition machine suppliers, we know that investing in an automatic concrete removal robot from Conjet will be worth your investment in terms of efficiency, safety, and health.

These are the advantages you can expect when investing in a hydrodemolition robot from Conjet:

  • No micro-cracks in the remaining structure, which ensures that the repair will be long-lasting with a high quality.
  • Creates no vibrations, and noise and dust are dramatically reduced.
  • Allows for both selective and non-selective removal.
  • Keeps the rebars clean and intact.
  • Prepares a surface ideal for bonding between old and new concrete.
  • 25X faster than mechanical jackhammering.

Contact us for more information about our ACR™ robots and the robotic demolition machine price of our different solutions.

https://www.conjet.com/wp-content/uploads/2021/11/conjet.jpg 669 1000 SEO GO MO https://www.conjet.com/wp-content/uploads/2021/09/logo.png SEO GO MO2022-08-01 09:02:332022-09-13 13:22:36Advantages of a robotic demolition machine

Hydrodemolition of bridge decks – The ideal solution for structurally deficient bridges

July 28, 2022/in Blog post

Most new bridges are built with a life expectancy of around 75 years, however, normal wear and tear cuts that lifespan by around 30 years. Bridge decks in particular deteriorate faster than any other part of the bridge due to direct impact from traffic, weather, and application of different chemicals (e.g., de-icing chemicals). The stressor of elements, chlorides, and brines attacks metals which cause the steel rebar to corrode, and as a result, the concrete may crack.

As such, selective demolition is often a requirement to reverse these effects, where hydrodemolition of bridge decks is often considered the best option.

The challenges of repairing bridge decks

Due to the vulnerability of deteriorating and structurally deficient bridges, selective demolition is often a requirement to restore them in a fast and cost-effective manner. Selective demolition is defined as the removal of damaged or low-strength concrete while leaving the health concrete intact.

However, construction repair (and especially selective removal) is anything but easy. It’s a strenuous and tedious process as maintaining its structure can be difficult. Bridge deck repairs will require that the old, damaged concrete be replaced without the removal of or risk of damaging the steel or beam structures. This can be achieved through various methods, most of which are unfortunately unsafe and don’t guarantee an easy extraction and replacement of the concrete. Mechanical methods such as jackhammers can potentially damage connectors or other embedded steel, while jackhammers, along with milling and hydraulic hammering, may also leave microfractures on the surface of the bridge deck concrete.

Instead, opting for hydrodemolition for bridge decks is often your best bet. It’s an efficient, cost-effective, and precise method to remove deteriorated concrete with high-pressure water without any risk of damaging the surrounding concrete or steel. It can be used for almost every part of the bridge, not just the bridge deck, including:

  • Abutment walls
  • Beams
  • Bearing foundations
  • Piers (pillars)
  • Parapet walls

Advantages of using hydrodemolition for bridge decks

Hydrodemolition of bridge decks remove concrete in a controlled manner without any vibrations which reduces the risk of microcracking. Many consider it the ideal concrete removal method, not only for bridges, due to its ability to create greater exposed aggregate areas which allows for great bonding with the new concrete or coating.

Hydrodemolition of bridge decks eases the concerns surrounding vulnerable bridges and the removal of damaged/structurally insufficient concrete through its many benefits:

  • Noise and dust pollution are dramatically reduced
  • The water can be collected for treatment and recyclable for future projects
  • It’s cost- and time-effective
  • Does not cause any microcracking, ensuring a long-lasting repair of high quality
  • Allows for both selective and non-selective concrete removal
  • Prepares an ideal surface for bonding between old and new concrete
  • Keeps the rebar clean and intact, and removes existing corrosion 
  • Reduced risk of injury for operators

Conjet’s Automated Concrete Removal robots, utilizing the hydrodemolition technology, are the ideal choice if you are looking for a concrete bridge repair method that will maximize the bridge’s lifespan, increase workers’ safety and minimize traffic impacts. We call it ACR™.

For more information about hydrodemolition of bridge decks and what advantages hydrodemolition robots and frames provide in bridge restoration, contact Conjet. 

https://www.conjet.com/wp-content/uploads/2021/11/Conjet6.jpg 562 1000 SEO GO MO https://www.conjet.com/wp-content/uploads/2021/09/logo.png SEO GO MO2022-07-28 06:43:052022-07-28 06:43:05Hydrodemolition of bridge decks – The ideal solution for structurally deficient bridges

Advantages of using hydrodemolition for concrete surface preparation

July 3, 2022/in Blog post

The renovation and replacement of concrete structures such as bridges, substructures, and roadways are of vital importance to ensure safety. However, most concrete repairs fail due to poor concrete surface preparation.

It is critical that all unsound concrete is removed, leaving a sound, clean, and roughened surface to improve the quality and performance of the newly applied coating. To optimize coating adhesion and ensure a high-quality concrete surface repair, the concrete surface needs to be completely clean.

Here’s why using hydrodemolition for concrete surface preparation is superior to conventional methods such as chemical cleaning, acid etching, or mechanical preparation.

What is hydrodemolition?

Hydrodemolition is a method of using high-pressure stream(s) of water to blast away deteriorated concrete. It provides a precise way to remove layers of concrete and can remove concrete below the reinforcement bars. This process will clean the rebar while simultaneously preparing the remaining concrete, thus providing an excellent surface for the new concrete to bond to.

Advantages of hydrodemolition

Hydrodemolition concrete surface preparation equipment allows the user to remove concrete at very precise depths and create a uniform surface. Hydrodemolition also preserves the reinforcement bars and does not cause any impact and/or vibration into the structure in the way a jackhammer would.

It is also a very environmentally friendly method as it reduces both air and noise pollution, and does not use any type of chemicals. And the water during the demolition process can also be captured quickly and easily to the risk of runoff contamination. 

To summarize, hydrodemolition:

  • does not cause any micro-cracks in the structure, ensuring a long-lasting repair of high quality
  • creates no vibrations, and noise and dust are dramatically reduced
  • allows for both selective and non-selective removal
  • keeps the rebars clean and intact
  • prepares a rough surface ideal for bonding between old and new concrete
  • improves efficiency as hydrodemolition is more than 25x faster than mechanical jackhammering.

Concrete surface preparation equipment from Conjet

The advantages of using hydrodemolition for concrete surface preparation do not stop there. Our hydrodemolition process involves one of the most sophisticated automatic robotic systems available. The Conjet ACR™ (Automated Concrete Removal) can be programmed to perform its duties by a single operator well clear of the demolition site. It can be programmed to cut specific shapes with no overruns or relief cuts, such as a manhole or for ductwork. 

We offer the ideal concrete surface preparation equipment to quickly and safely remove concrete, coatings, rusts, and other tough adherents. For more than 35 years, we have been instrumental in the development of hydrodemolition for concrete removal and surface preparation.

Read more about our concrete surface preparation using ACR™ or contact us for more information.

https://www.conjet.com/wp-content/uploads/2022/06/AIQA3970-scaled.jpg 1920 2560 SEO GO MO https://www.conjet.com/wp-content/uploads/2021/09/logo.png SEO GO MO2022-07-03 06:47:132022-08-15 07:27:36Advantages of using hydrodemolition for concrete surface preparation

Advantages of hydrodemolition equipment at noise-restricted construction and demolition sites

June 3, 2022/in Blog post, Hydrodemolition

 

Just like the air we breathe, sound is just as an important – yet often overlooked – part of our lives. And just as air quality can have a detrimental effect tion and demolition industry. Even though they are vital to further develop our society, the noise produced by erecting, remodeling, and demolishing structures results in a number of health concerns including:

  • Stress
  • Hearing loss
  • Cardiovascular disease
  • Cognitive impairment

Hydrodemolition equipment has proven to be a viable solution as the pressure from all sides increased in the search of an efficient, cost-effective way to limit noise pollution. In the end, sound-proofing a construction site is easier said than done. Sound abatement techniques can reduce decibels, but lack the capability to eliminate the biggest noise polluter – machines.

The many benefits of hydrodemolition equipment

Hydrodemolition equipment is gaining popularity in concrete removal as a method not only able to prevent noise pollution as compared to conventional demolition equipment such as pneumatic breakers, but also provides a host of other benefits including:

  • Does not cause any micro-cracks in the remaining structure, ensuring long-lasting repair of high-quality. 
  • Enables both selective and non-selective removal of concrete
  • Causes no vibrations during the removal process
  • Cleans the rebars, sparing you time and effort of sandblasting the reinforcing steel
  • Hydrodemolition is generally around 25x faster than mechanical jackhammering
  • Prepares an ideal surface for bonding between new and old concrete

Hydrodemolition equipment is relatively silent compared to traditional demolition methods, allowing contractors to efficiently continue operators without disturbing their neighbors or risking the health of their employees.

Hydrodemolition vs. Pneumatic devices

Demolition and surface preparation are inherently noisy, where traditional removal techniques such as using pneumatic devices operate at unhealthy decibel levels. The noise level can of course vary greatly depending on a wide variety of factors including where the project is taking place (open or enclosed environment), the condition of the material being removed, and the type of machinery being used.

Handheld pneumatic devices and concrete saws register around 90-100 dB, about the same as a lawnmower or snowblower. Whereas most hydrodemolition equipment typically registers around 10-20 dB lower than that of many traditional demolition techniques.

How can Conjet’s hydrodemolition robots be so quiet?

This is a combination of several factors:

  • Rubber hoods: All our hydrodemolition robots are equipped with a rubber hood which covers the demolition area and not only dampens sound, but also protects the workers from debris. 
  • Remote operations: While it doesn’t reduce the overall decibel levels, remote operation capabilities allow the workers to control the robots from a distance, thus increasing sound safety. 
  • High-quality sound engineering: We’ve worked on perfecting the sound engineering of our hydrodemolition robots, guaranteeing low sound levels to minimize jobsite noise – ensuring the contractor’s ability to meet sound regulations in urban areas.
  • Quick and efficient: The Conjet hydrodemolition robots ensure fast and efficient concrete demolitions and repairs, minimizing the time the machines have to be active.

Hydrodemolition equipment for sale

It’s time to turn down the volume on your concrete removal and surface preparation applications. If you’re looking for hydrodemolition equipment for sale, contact Conjet.

Noise restriction will in most likelihood continue to increase as jobsits move further into heavily populated urban environments. Investing in quieter methods will not only ensure you will be able to meet current sound level regulations, but also promises long-term options as the industry continues to evolve. Explore our demolition equipment for sale.

 

https://www.conjet.com/wp-content/uploads/2022/06/hydrodemolition_noise.png 975 1500 SEO GO MO https://www.conjet.com/wp-content/uploads/2021/09/logo.png SEO GO MO2022-06-03 04:39:312022-06-08 06:52:24Advantages of hydrodemolition equipment at noise-restricted construction and demolition sites

Ola Sylvan appointed as Product Development & Engineering Manager

April 26, 2022/in Blog post, Company News

 

Conjet AB is excited to announce that Ola Sylvan has joined the team as Product Development & Engineering Manager
Ola will play a vital role for Conjets future Product development and Engineering activities. He will work closely with the existing technical team and continue to develop our processes and products. He will on a daily basis work closely both with product management and operations to help Conjet reach our ambitious targets.

Ola has extensive experience from product development and engineering and has been excelling in previous Product development and Project management roles. He has patents in several different areas of technology and has worked with and been responsible for, complete and complex mechatronic systems. Olas areas of expertise is in mechanics, hydraulics, electricity, control system and FEM & CFD calculations, and has a Master of Science in Engineering from Linköping University with focus on Mechatronic, robotics and Automation.

Ola Wagner, COO, stated,

“We are extremely happy to welcome Ola Sylvan to Team Conjet. We are in a critical phase in extending our engineering capabilities and Olas experience and skills are critical in helping us to develop our products and offering and continue improving the service to our customers. Warm welcome aboard, Ola!”

https://www.conjet.com/wp-content/uploads/2022/04/Ola-S.png 1026 1170 Rebecca nilsson https://www.conjet.com/wp-content/uploads/2021/09/logo.png Rebecca nilsson2022-04-26 13:42:462022-06-02 08:14:11Ola Sylvan appointed as Product Development & Engineering Manager

Hydrodemolition 101 – terminology

April 19, 2022/in Blog post, Hydrodemolition

If you are new to the the world of hydrodemolition the terminology can sometimes be difficult. This is a list of specific terms being used in the concrete removal and hydrodemolition field. 

 

ACR™

Automated Concrete Removal. Selective or non-selective removal of concrete from structures done by hydrodemolition robots being programmed and remotely operated.

BAR (UNIT)

A metric unit of pressure. 1 Bar = 14.5 psi

1 = atmospheric pressure at an altitude of 111 meters above sea level at 15 deg. C.

BONDING

When new concrete is put on top of old concrete, to restore a structure.

COMPRESSIVE STRENGTH

The ability of concrete to withstand forces that are pushing on it without braking.

CRADLE

The assembly that the cutting lance is attached to and allows the robot to aim and manipulate the water jet.

CUTTING LANCE

The assemble including the nozzle that is the robots final contact with the water.

FEED BEAM

The structure of the robot that the cradle travel on. It can be straight or curved to match a surface profile.

HYDRODEMOLITION

The process of selective removal of concrete by means of one or more high-speed water jets. You can read more about hydrodemolition here.

MICRO-CRACK

A crack in the structure that appears when concrete is removed using methods creating friction in the structures, which in turn creates micro cracks.

 

MPA

Multipurpose arm. This is one of Conjets unique features and it  allows you to easily adjust and position the cutting head from the remote control.

NALTA

The smallest ACR™ robot on the market, allowing allows selective concrete removal in inaccessible areas.

NON-SELECTIVE REMOVAL

The capacity to remove concrete to a specific depth, not based on the concrete strength.

MPA (MEGAPASCAL)

A unit for measuring pressure or stress

1 MPa = 145.038 psi

PSI (POUNDS PER SQUARE INCH)

A unit for measuring pressure or stress.

14.7 psi = atmospheric pressure sea level

SELECTIVE REMOVAL

The capacity to remove concrete by its strength and not to a specified depth.

STEP LENGTH

The distance the track(s) will move during operation.

STEP SPEED

Determines the length of time the valve for track movement is open during operation.

STRUCTURES

Different constructions build of concrete: bridges, dams, docks, parking decks, tunnels etc.

TENSILE STRENGTH

The ability of the concrete to withstand pulling forces without breaking.

https://www.conjet.com/wp-content/uploads/2022/03/AIQA3970-scaled.jpg 1920 2560 Rebecca nilsson https://www.conjet.com/wp-content/uploads/2021/09/logo.png Rebecca nilsson2022-04-19 11:23:412022-06-02 08:14:11Hydrodemolition 101 – terminology

Why you should use robotic technology to remove concrete

April 11, 2022/in Blog post, Hydrodemolition

Automated Concrete Removal Robot Conjet

Swedish-based Conjet has spent more than 35 years on innovation and engineering around Automated Concrete Removal – ACR™ using hydrodemolition.  Conjets mission has always been to develop a solution that removes concrete for restoration of structures in a safe manner, where no micro-cracks are created, leaving a surface ideal for bonding. The soultion is called ACR™ – Automated Concrete Removal.

Automated Concrete Removal (ACR™) is a method utilizing robotic technology to remove concrete from building structures such as bridges, parking decks, dams and tunnels, using high pressure water – hydrodemolition.

Hydrodemolition technology ensures that no micro-cracks are created during the concrete removal process and provides an ideal surface for bonding of new concrete, while the hydrodemolition robot secures the quality and consistency of the removal process.

Using ACR™ fully automates the operation of concrete removal, allowing you to provide a safe working environment and increase production efficiency. In just one day, a single Conjet ACR™ robot removes the same amount of concrete as up to 25 operators with jackhammers. Even better, the ACR™ robot significantly limits the noise and eliminates dust and vibrations caused by conventional jackhammer methods.

KEY BENEFITS WITH AUTOMATED CONCRETE REMOVAL (ACR™)

  • Safe. All operations can be controlled from the ONE system wireless control, leaving the operator out of harm’s way.
  • Reliable. 35+ years of innovation and engineering has resulted in solid knowledge and experience of successful concrete removal on hundreds of structures.
  • Automation. The Conjet ONE control system allows operators to easily set removal parameters.
  • Sustainable. With selective removal, only damaged concrete is removed, without leaving micro-cracks.
  • Allows for either selective and non-selective removal. From scarification to deep removals and even through slab.
  • Ease of use. State of the art GUI and reliable components.
  • Versatility. Repositioning for another type of work is done in minutes. From the reach and stability of the robot to the available accessories ACR has you covered.
  • Cloud connectivity. Always connected to the cloud. The operator can have both the robot and powerpack at his or her fingertips.

THIS IS HOW ACR™ WORKS

Automated Concrete Removal - how does it work

After completing the start-up routine, the operator can load a saved set of parameters or enter new parameters on the ACR™ robot, either directly on the robot’s display or using the handheld remote control. The operator then positions the robot and starts the automated concrete removal process from a safe distance of 15-30 feet (5-10 meters).

The robot then operates autonomously according to the chosen parameters, working its way in a straight line, in a curve, or in a circle, while the operator monitors and supervises the process.

WHY AUTOMATED CONCRETE REMOVAL – ACR™

WORK AND HEALTH SAFETY

The biggest challenge on all sites where concrete is being removed, or even demolished, is to secure work and health safety for the operators.

Using ACR™ hydrodemolition robots to get the job done is a way to secure a safe working environment for the operators.

RELIABLE

As with all automated solutions, the ACR™ robot is programmed to do the job according to specification. Whether it is to remove the concrete down to a certain depth or quality, the ACR™ robot will prepare a surface optimized for bonding.

SUSTAINABLE

The preferred method for ACR™ robots is to remove concrete using a high-pressure water jet – or hydrodemolition.

This is a sustainable way to remove the concrete from any structure where no micro-cracks are created, and therefore the remaining structure does not need further inspection or analysis. It extends the useful life of the structure. Eliminates vibrations and dust; dramatically reduces noise.

EASE OF USE

Once properly trained, the operator will find the ACR™ robots easy to use with built-in operator guides, instructions, and visual feedback on the settings.

FLEXIBLE

ACR™ robots are engineered to get the job done, no matter if the surface is horizontal, vertical, cylinder shaped – or all of the above. The time it takes to re-program the robot is minimal, and with a wide variety of accessories available, you can get any job done using the same robot without the need for rebuilding.

Flexible concrete removal - ConjetFlexible concrete removal - Conjet
CONNECTIVITY

The ACR™ robots are connected to the cloud. Conjet Connect allows you to monitor real time data, store data and can over time support you in optimizing your fleet’s efficiency.

 

SAFETY FIRST! – ACR™ AND SAFETY

Safe automated concrete removal - Conjet

One of the biggest challenges on all sites where concrete is being removed, or even demolished, is to ensure the health and safety of the workers. 

Using ACR™ robots to get the job done is a way to keep a safe working environment for the workers. The robots are operated via the Conjet ONE control system, allowing all operations to be configured and monitored from the radio remote control box at a safe distance from the robot.

 

CONJET ONE FOR SAFE, AUTOMATED OPERATIONS

The ACR™ robots can be configured from the display on the robot itself, or from a distance using the user-friendly radio-remote control box. This results in shorter start-up time and increased operational efficiency.

The Conjet ONE controls not only the robot, but it communicates with the high-pressure pump.

Even if the ACR™ robots allow for fully automated operations, the robot requires reactivation from the operator in a set time interval to continue the job. Failure to do so will bring the high-pressure pump to idle position, which in turn stops the robot. The reactivation is easily done from a distance by touching the hand-held control-unit.

CHECKLISTS 

Every ACR™ robot is delivered with a daily checklist on items that should be signed off on by the operator before starting the shift.

By using the checklist, the on-site safety officer or supervisor can ensure that work safety regulations are being followed with regards to the robot, as well as maintaining minimum downtime and sufficient maintenance of the robot.

NOISE AND VIBRATIONS

The ACR™ robots are built around hydrodemolition technology, using high-pressure water to remove the concrete. This technology is much quieter than traditional concrete removal and demolition technologies. It doesn’t create any vibrations, and therefore improves the overall working site environment. Traditional jackhammers cause vibrations in the structure and that disturbs others on multiple floors.

This makes ACR™ the optimal solution for sites located in a building with residences and/or offices.

SAFE FOR THE STRUCTURE

Hydrodemolition technology is the preferred technology for restoration of concrete structures as it creates zero vibrations and zero micro-cracks. Moreover, the surface left after removal is ideal for bonding. This results in a longer structure life after repair, which in turn gives a better return of investment for the owner. 

 

OPTIMIZED UPTIME AND PRECISION – ACR™ AND RELIABILITY 

Reliable concrete removal - Conjet

Once the job is defined, and you have been awarded the contract to do the project, the real challenge begins. How do you ensure the job is done in a safe way, within the agreed timeframe and budget?

MINIMIZED DOWN TIME

If ACR™ is the chosen method for restoration, downtime is automatically minimized. The robots used are very reliable, which means minimal unplanned downtime due to breakdowns.  

The ACR robot is highly efficient thanks its multipurpose design, as the time it takes to shift from one surface to another (horizontal to vertical) is done by the operator using a handheld remote control. So, both planned downtime and unplanned downtime are greatly reduced.

PRECISION

ACR™ uses hydrodemolition as the method to remove concrete. This allows the owner of the structure – and in the end the operator monitoring the robot doing the work – to choose between selective and non-selective removal. Selective removal means that the ACR™-robot is configured to remove the concrete of a certain quality or compressive strength (measured in MPa or psi), whereas non-selective removal means removing a certain depth of the concrete surface. No matter which option is preferred, the ACR™ robots will deliver the required results leaving a surface ideal for bonding. 

SERVICE & SPARE PARTS AVAILABILITY

Conjet, the provider of ACR™ robots, has a global network of certified partners and distributors, ensuring that your robot is well taken care of and that downtime is kept to a minimum.

CERTIFY YOUR OPERATORS 

To optimize the uptime for the ACR™ robots, it is also advised to certify operators with Conjet University. The operators will not only be trained on how to configure the robot to get the desired results, he/she will also be trained on the safety routines required at the beginning of every shift as well as preventative maintenance, troubleshooting and replacement of consumables. 

DATA ANALYSIS

The ACR™ robots are all prepared with Conjet Connect – a feature that collects data on the operations being performed. By analyzing this data, you can get in-depth knowledge on robot performance. This knowledge can be used to optimize your stock of consumables, plan services and in the end, lead to increased uptime.

https://www.conjet.com/wp-content/uploads/2022/04/S-Vesipiikkaus-5.jpg 1080 1920 Rebecca nilsson https://www.conjet.com/wp-content/uploads/2021/09/logo.png Rebecca nilsson2022-04-11 11:45:312022-09-13 13:24:51Why you should use robotic technology to remove concrete

SUSTAINABLE CONCRETE REMOVAL FOR BRIDGES

April 6, 2022/in Blog post, Hydrodemolition

Bridges are an important part of infrastructure – an enabler for urbanization and efficient movement of people in daily life. Bridges are by default very exposed to weather and wind thanks to their surrounding environment. Hydrodemolition is the right method to get the concrete bridge repair job done most effectively – here we tell you why! 

The history of bridges started in ancient times, and ever since then architects and engineers have improved them to the point they are today – mighty structures that span mountains, lakes and oceans. The Romans revolutionized the building technique by introducing arches, resulting in a structure that was very rigid and strong. The Turkish Karamagara Bridge that was built in the 5th or 6th century represents the oldest surviving Roman bridge that features pointed arch.

Many historical battles have been fought over the control of these bridges, making them a symbol of control of the flow of people and goods across rivers and canyons. Today, bridges are an important part of infrastructure – an enabler for urbanization and efficient movement of people in daily life.

Golden Gate Bridge, US

No one really knows how many bridges there are on planet earth, but the fact that there were over 600,000 bridges in the US alone in 2016 tells us something about the great number.

Out of these, 4 out of 10  – or 240,000 – are older than 50 years. It is estimated that 188 million trips annually are done over bridges that are structurally deficient, and recent estimates puts the investment needed for bridge rehabilitation in the US alone to a $123 billion.

In Europe, the situation is the same. In Italy, 300 bridges are at risk for failure and in Sweden, 800 out of a total 21,000 bridges are being investigated for needs of repair. Out of France’s 12,000 bridges one-third are in urgent need of repair and in Germany 1 out of 10 of the country’s 39,000 bridges are in bad condition.

Uddevalla bridge, Sweden

AGEING AND OTHER CHALLENGES WHEN RESTORING A BRIDGE

Bridges are by default very exposed to weather and wind thanks to their surrounding environment. Additional causes of aging over time are in general:

  • Chloride penetration. Chloride (salt) is often spread on roads and bridges in order to prevent ice from being created on road surfaces. On structures close to water, the salt is brought by wind or permeated in through cracks directly from the ocean. Once inside, the chloride causes corrosion at the rebars. The rebars expand when they corrode and, consequently, crack the surrounding concrete. These damages lead to an increased penetration of water and chloride, which speed up the aging procedure.
  • Freeze-thaw cycles. A similar cracking procedure of the concrete occurrs when water and moist inside the concrete freezes and thereby expands. The concrete can only withstand a specific amount of freezing cycles. This means that a concrete structure e.g. a bridge in an area where the temperature fluctuates around the freezing point will age a lot faster than one in a less seasonal climate.
  • Concrete is naturally basic but in contact with the air a chemical reaction caused by the carbon dioxide (Co2) decreases the pH value. When it gets too low (pH < 9) the corrosion of the reinforcement will accelerate (compared to the chloride penetration mentioned above). When this phenomenon occurs the carbonated concrete must be replaced.

Other challenges when restoring a bridge:

  • Abutment walls can be located on cliff faces and inaccessible to some equipment.
  • Beams can be at great heights above the ground or over water with nowhere to station a robot underneath.
  • Bearing foundations have limited access for a conventional hydrodemolition robot.
  • Decks with today’s high volumes of traffic the schedules are tighter than ever before.
  • Piers (Pillars): being the foundation of the bridge they can be of great height and are sometimes located partially under water or in the medians of other roadways or shipping channels.
  • Parapet walls: located along the edges of the bridge these are most exposed to the elements but are vulnerable to impact and even fire damage caused by vehicle accidents.

SUSTAINABLE RESULTS!

The keys to a sustainable, long-lasting result when restoring a bridge are:

  • Create a surface that is ideal for bonding new concrete.
  • Ensure that no micro-cracks are created in the process of removing damaged and/or old concrete.
  • Ensure that no damage is caused to the re-bars when removing the damaged and/or old concrete.
  • Use a methodology allowing the choice of selective (removal of the concrete down to a specific quality/strength) or non-selective removal (removal of x, y or z metrics of concrete, no matter the quality.

The aging of concrete is not linear, so hydrodemolition is the right method to get the bridge repair job done most effectively. The ACR™ robots have been developed to allow both selective and non-selective removal, leaving no micro-cracks or damage to the re-bars in the structure and a surface ideal for bonding. 

THIS IS HOW ACR™ AND HYDRODEMOLITION HELPS:

  • Abutment walls: If the robot arm does  not allow you to reach the removal area a tower attachment or a frame system are available.
  • Beams: the integrated arm of the robot allows you to remove the slab with the robot positioned on a solid area.
  • Bearing foundations: if there is not enough room for the robot, a frame system can get the job done.
  • Decks: with today’s high volumes of traffic the schedules are tighter than ever before. The arc robot with One control allows for ease of operation and less downtime, helping you keep on schedule. 
  • Piers (Pillars): A frame system can be setup on the pier, and you can accomplish the removals either in stages or with a larger frame to cover the entire area in one setup. 
  • Parapet walls: not only can you extend the tracks but also slide the body of the robot for extra stability, when reaching over the wall. All without any additional attachments.

Want to know how Conjet’s hydrodemolition robots can make you concrete brigde repair more efficient? Contact us here!

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Conjet to Participate in the Canadian Concrete Expo

March 28, 2022/in Blog post, Uncategorized

Conjet Inc., the North American distributor for Conjet AB’s line of Automated Concrete Removal (ACR®) hydrodemolition robots, is happy to announce that it will be exhibiting at the 2022 Canadian Concrete Expo in Toronto, Ontario. The Expo will take place on May 18-19 at the International Centre.

Stephen Sistrunk, Conjet’s CEO of North America, stated,

“In Canada, the demand for jobsite automation and hydrodemolition is rapidly growing. The country is a major focus area for our organization as we seek to better support our current customers and bring on new customers to support this market growth. So, we are very excited to be exhibiting at this year’s CCE event. We look forward to meeting face-to-face with infrastructure managers, our customers and anyone else who is looking to improve the efficiency, safety and quality of their concrete restoration projects with ACR.”

If you would like to schedule in advance a time to meet with us at the Canadian Concrete Expo (booth 3319), or just learn more information about Conjet’s products and services, please reach out to Rick Larsson at rick.larsson@conjet.com or (443) 926-3827. Otherwise, we look forward to seeing you at the show!

https://www.conjet.com/wp-content/uploads/2022/03/Conjet_woc2022_1.png 986 1480 Rebecca nilsson https://www.conjet.com/wp-content/uploads/2021/09/logo.png Rebecca nilsson2022-03-28 09:04:052022-06-02 08:14:11Conjet to Participate in the Canadian Concrete Expo

NEW CONJET DISTRIBUTION PARTNER IN UK & IRELAND

March 22, 2022/in Blog post, Company News

We are excited to announce and introduce Doornbos Equipment as our new distribution partner for Conjet in United Kingdom and Ireland! Together with the team at Doornbos UK, we will make sure to increase product-, service- and support availability to both existing and new Conjet customers, and we look forward to support current business relationships as well as new opportunities together with our new partner.

Niklas Vallin, Regional Sales Director Europe, says

“In Doornbos we have a dedicated partner with great knowledge in hydrodemolition and the construction industry. Doornbos will have Conjet ACR™ robots in stock for rental and demos.  Please feel free to contact them for enquiry, demos or if you just are interested to learn more about all the benefits with Hydrodemolition.”

If you want to come in contact with our distributor, check out Doornbos website.

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Latest News

  • Advantages of a robotic demolition machine August 1, 2022
  • Hydrodemolition of bridge decks – The ideal solution for structurally deficient bridges July 28, 2022
  • Advantages of using hydrodemolition for concrete surface preparation July 3, 2022
  • Advantages of hydrodemolition equipment at noise-restricted construction and demolition sites June 3, 2022
  • Ola Sylvan appointed as Product Development & Engineering Manager April 26, 2022
  • Hydrodemolition 101 – terminology April 19, 2022
  • Why you should use robotic technology to remove concrete April 11, 2022
  • SUSTAINABLE CONCRETE REMOVAL FOR BRIDGES April 6, 2022
  • Conjet to Participate in the Canadian Concrete Expo March 28, 2022
  • NEW CONJET DISTRIBUTION PARTNER IN UK & IRELAND March 22, 2022

Conjet has more than 35 years of experience in the hydrodemolition business. Our goal is to create the best products for every type of hydrodemolition application, providing you with the widest range of ACR™ hydrodemolition equipment.

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