Abstract There is such a magical rope that can be rotated back and forth on the bridge. Cutting the concrete bridge surface is as simple as cutting the cake, and it is small in noise, small in pollution, safe and reliable. This magical rope was also used in the widening and reconstruction of the Northeast Road Bridge. Recently, diamond...
There is such a magical rope that can be rotated back and forth on the bridge. Cutting the bridge deck of the concrete is as simple as cutting the cake, and the noise is small, the pollution is small, and it is safe and reliable. This magical rope was also used in the widening and reconstruction of the Northeast Road Bridge. Recently, the diamond wire saw officially “facilitatedâ€, and the efficiency and accuracy of its “knife method†made all the viewers stunned. Beginning on the night of March 20, the cut bridge block was lifted. The reporter saw on the bridge of the northeast road bridge that was being dismantled across the Gorky Road bridge. A row of four very inconspicuous machines were fixed on the bridge deck, wrapped around a long rope with only the thickness of the fingers, and a large number of ring-shaped metal was fixed on the rope. Section. This kind of rope is a diamond wire saw. It is the world's leading cutting machine and is made of special materials such as alloy steel. Zheng Zhongke, who is in charge of operating the wire rope saw, said: "The length of the wire saw is 12 meters. Cut the bridge deck first. After cutting, cut the remaining half. It takes 6 to 7 hours to cut a bridge."
According to the person in charge of the site, the reason why the bridge was demolished with a diamond wire saw is to ensure the accuracy of the cutting, and the impact of the demolition is also minimal. It is very suitable for construction in urban residential areas. If the bridge is broken with a common hydraulic breaker. Or traditional blasting operations can easily affect traffic and pollution. During the cutting of the northeast road bridge, the construction unit prepared a total of six wire saws, four of which simultaneously “moved the knife†and two spares for the bridge.
It is reported that the northeast road bridge that needs to be dismantled is divided into 205 meters of reinforced concrete box girder and 45 meters of steel box girder. The diamond wire saw is responsible for the removal of the reinforced concrete box girder. The box girder needs to be cut into pieces of 2.5 to 3 meters, each weighing about 35 tons, and a total of 116 pieces are required to be cut. With the current construction progress, 5 to 6 pieces can be cut every day, and the total construction period is planned to be 25 days. At the same time, the 45-meter steel box girder section is undergoing the demolition of the bridge deck ancillary facilities. It is expected that the demolition will begin in this week. The steel box girder needs to be removed by welding and cutting into 21 pieces, and the planned total construction period is 20 days. The new 23 steel box girder has been prefabricated.
3 "magic" places of diamond wire saw
One of the magic: low noise
In the past demolition of buildings, mechanical demolition or blasting operations are often used, which is very noisy. Demolition construction in residential areas, residents have to endure huge noise. The removal of the diamond wire saw process completely avoided this drawback. The reporter saw that the diamond wire saw only grinds the sound of reinforced concrete during the cutting process. The electro-hydraulic motor runs smoothly, and there is no huge harsh sound in the whole construction.
Magic 2: Avoid dust pollution
If the traditional bridge removal process is adopted, it will inevitably generate a lot of dust. The diamond wire saw is used, and the high-speed running diamond rope in the cutting process is cooled by water, and the grinding debris is taken away without causing pollution of the dust.
Magic 3: Safety is guaranteed
The traditional mechanical demolition of bridges or blasting operations, construction is in an uncontrollable state, there is a potential safety hazard of collapse of the viaduct. Since the cutting is done during the grinding of the reinforced concrete by the diamond tool, there is no vibration problem. There is no impact on the bridge structure, no fine cracks will be generated and the structure will be affected. Moreover, it does not impact the load, and it does not generate a large impulse to the bridge itself, so safety can be guaranteed.
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