Reducing dust when installing post-installed rebar with Hilti SafeSet™
Hong Kong is one of the densest cities on earth and the MTR system is its most popular form of transport, with over 1.6 billion passengers a year. It’s extremely busy and any disruption to the railway has to be kept to a minimum.
So when the MTR decided to build a new lift at the Lai King station, it was crucial to keep dust to a minimum to stop any disturbance to the railway itself.
Our Hilti SafeSet™ system was chosen as the answer. We used a mix of HIT-HY 200 chemical adhesive alongside TE-CD and TE-YD hollow drill bits and our Hilti VC 40 vacuum cleaner. Our hollow drill bits meant the dust could be vacuumed up through the drill bits whilst the drilling and collected safely using our Hilti VC 40 vacuum cleaner.
This work helped to keep the drill hole clean without the need for manual cleaning. Injecting our chemical adhesive was quick and easy, saving building time and minimising harmful dust on the build.
Special application: Post-installed rebar and anchoring technology
During the restoration of the Trevi Fountain in Rome, one of the columns in the façade was found to be unsafe, with a crack around its base. This may have also been contributing to cracks in the fountain’s friezes.
We were asked to advise on what to do and the customer decided to use our Hilti TE-30 drill, drilling holes 25 mm in diameter. We used Hilti M20 1.30 m steel rods anchored by HIT-RE 500 chemical adhesive and injected excess adhesive to compensate for any voids inside the base.
The restoration was completed in 2015 with the fountain restored to its former glory.
The new road bridge at Nathdwara in India is part of a mammoth project to build 50 miles (80 km) of new road and bridges to link the key cities of Gomti Chauraha and Udaipur in Rajasthan. It’s going to make a huge difference to the lives of commuters, saving time and money travelling in the region.
The bridge at Nathdwara though, has a steep curve in it and needed seismic stoppers to protect it against earthquakes.
But the stoppers had to be inserted while the bridge was in construction and that wasn’t easy to do, as it was difficult to drill deeply into the reinforced columns that were already in place.
So we were asked to find a solution. We suggested using our Hilti HIT-HY 200 chemical adhesive in tandem with our HIT Rebar Design Method for shorter anchorage lengths.
Our design method and HIT-HY 200 allowed the stoppers to be fixed in a shallow environment and reduced the anchor depth from an estimated 800 mm to 360 mm. The building teams could then drill easily into the existing columns, inject our adhesive and fix the stoppers.
Our Hilti engineering team also stayed onsite to help in person throughout the process.
Green building in the heart of Copenhagen’s old city
Krøyers Plads is a part of an exciting new build in the heart of Copenhagen’s old city with a history dating back to 1747. It’s a challenging build because of its location and historical importance. It's also an important build, as it was one of the first to be built under Denmark’s new codes for green building, the namely "Nordic Swan" or "Svanemaerket" codes.
The project is a mix of 20,000 m2 of offices, retail and housing. All of it needs to live up to Danish BR 15 energy regulations and will be visually green, with one façade and the roof covered with vegetation. This was a big green building challenge, but we were more than able to help with one of our Clean-Tec products, designed to exceed statutory environmental requirements.
So while our Hilti engineers gave advice and technical calculations, our Hilti HIT-CT1 Clean-Tec adhesive was just right for post-installation rebars, matching the Nordic Swan codes, with a mal code of 00-3.
Using post-installed rebars to repair cast-in rebars
The Delhi Metro aims to change the way people travel not just in Delhi, but in the whole of India. Its sleek, shiny and air-conditioned trains are heralding a “new era” of mass urban transportation in the country. With high expectations, they aim to have the highest number of stations with the longest metro system in the world - even surpassing London’s 150 year old tube in length, all within just a few years!
While building at the Nehru Place metro station, it hit a snag. Some of the steel couplers became misplaced during building, and we were brought in to see what could be done.
The solution was to install post-installated rebar reinforcement bars to give the structure more support and substitute the misplaced rebars.
We found that our Hilti HIT-HY 200 chemical adhesive was a good fit to fix in the post-installed rebars it needed - another great job, done.
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