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The main advantage of using concrete batching plant is that it reduces the problems of inefficiency and wastage happening during the concrete production at construction sites. The concrete batching plants can be of two forms either the stationary heavy production units or the famous mobile batching plants which can be used to both produce and

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NORMAL -- No one was injured Friday when a 100-foot-long steel arm -- being lowered from a tower crane above the Illinois State University Performing Arts Center -- crashed onto the four-story building and adjacent Williams Hall. The accident took place at about 9:50 a.m. at the site of the Performing Arts Center construction project. It appears one of three mobile cranes from Big Hook Crane Service in Normal malfunctioned or was affected by a wind gust. The arts center, scheduled for completion this fall, is located on School Street west of downtown Normal. Two of the cranes were being used to lower the third crane's massive extension arm, or jib. The accident tipped one crane and crumpled the booms of the other two. "We had just walked out of the (arts) building when we heard it," said Bill Brockett, a foreman for Union Roofing in Bloomington also working at the site. "It looked like the wind caught the jib, and then it got away from them. All we saw was everything going that way (west) and it hit. "It sounded like a train crashing." Friday evening, university spokesman Jay Groves said the accident did minimal damage to the under-construction arts center and to Williams Hall, which was built in 1940. At Williams Hall, home of the College of Business, damage was limited to a broken window, broken bricks and siding, and some damage to a top-story mechanical room. There was also some damage to the top of the arts center, where roofing work is being done, Groves said. A damage estimate probably won't be available until Monday or Tuesday, Groves said. Inspectors from the university's safety office were examining Williams Hall on Friday, and if the building is deemed safe, it will reopen for university use today, Groves said. For safety reasons, the area immediately around the cranes had been cleared of workers before the attempt to lower the jib. Others were taking a break inside the arts building when they were shaken by the violent jolt. "We knew something wasn't right as soon as we heard it," said a construction worker who declined to give his name. "It was a small boom and you felt a small shudder like an earthquake kind of for a second or two. It could have been a lot worse, that's for sure." The federal Occupational Safety and Health Administration is investigating the accident, which forced the evacuation of more than 100 people from Williams Hall. John Weaver, president of Big Hook Crane Service and operator of the mobile crane that was toppled, declined comment. A spokesman for Pontiac-based Vissering Construction, the general contractor on the project, could not be reached for comment. Two workers who had helped disconnect the jib from the tower crane were standing atop the crane's cab at the time of the accident. The boom on the 14-wheeled crane operated by Weaver struck the southeast corner of Williams Hall and prevented the crane from fully tipping over. That crane's arm snapped from the boom and fell onto the top of Williams Hall. ISU painter Bill Bieber was glazing and caulking windows on the south side of Williams Hall when he heard the sound of buckling steel. He looked up as the jib from the crane toppled onto and over the roof's edge about 20 feet from him. "It made a thundering crash and everything was swaying my direction," said Bieber. "You can't predict where it's going to bend and buckle. You just start trying to get away and hope you moved in the right direction. "It's a miracle nobody was hurt. It's a noise I don't ever want to hear again," Bieber said. More cranes were brought in to help remove the damaged equipment from the rooftops Friday afternoon. The crane's base tower is 120 feet tall. The jib, or extension, can be up 240 feet long and is used to shuttle building materials. The crane can lift a 6,600-pound load when the trolley is 135 feet from center and up to 24,000 pounds when it's closest to center. When in use, tower cranes are the most stable hoisting devices at a construction site, said Steve Fonderoli of Country Crane in LaSalle. "Once a tower crane is assembled, they're the safest crane on the site because of all the limit switches, which won't allow the crane to pick up more than its capacity," said Fonderoli. He said the degree of difficulty in assembling and disassembling it is "the most dangerous aspect of the tower crane." OSHA standards require the crane to be shut down when the wind reaches 20 mph. The top wind speed as recorded by ISU Friday was 17 mph

p&h 4170c mobile mining crusher - surface mining | komatsu mining corp

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The main advantage of using concrete batching plant is that it reduces the problems of inefficiency and wastage happening during the concrete production at construction sites. The concrete batching plants can be of two forms either the stationary heavy production units or the famous mobile batching plants which can be used to both produce and

NORMAL -- No one was injured Friday when a 100-foot-long steel arm -- being lowered from a tower crane above the Illinois State University Performing Arts Center -- crashed onto the four-story building and adjacent Williams Hall. The accident took place at about 9:50 a.m. at the site of the Performing Arts Center construction project. It appears one of three mobile cranes from Big Hook Crane Service in Normal malfunctioned or was affected by a wind gust. The arts center, scheduled for completion this fall, is located on School Street west of downtown Normal. Two of the cranes were being used to lower the third crane's massive extension arm, or jib. The accident tipped one crane and crumpled the booms of the other two. "We had just walked out of the (arts) building when we heard it," said Bill Brockett, a foreman for Union Roofing in Bloomington also working at the site. "It looked like the wind caught the jib, and then it got away from them. All we saw was everything going that way (west) and it hit. "It sounded like a train crashing." Friday evening, university spokesman Jay Groves said the accident did minimal damage to the under-construction arts center and to Williams Hall, which was built in 1940. At Williams Hall, home of the College of Business, damage was limited to a broken window, broken bricks and siding, and some damage to a top-story mechanical room. There was also some damage to the top of the arts center, where roofing work is being done, Groves said. A damage estimate probably won't be available until Monday or Tuesday, Groves said. Inspectors from the university's safety office were examining Williams Hall on Friday, and if the building is deemed safe, it will reopen for university use today, Groves said. For safety reasons, the area immediately around the cranes had been cleared of workers before the attempt to lower the jib. Others were taking a break inside the arts building when they were shaken by the violent jolt. "We knew something wasn't right as soon as we heard it," said a construction worker who declined to give his name. "It was a small boom and you felt a small shudder like an earthquake kind of for a second or two. It could have been a lot worse, that's for sure." The federal Occupational Safety and Health Administration is investigating the accident, which forced the evacuation of more than 100 people from Williams Hall. John Weaver, president of Big Hook Crane Service and operator of the mobile crane that was toppled, declined comment. A spokesman for Pontiac-based Vissering Construction, the general contractor on the project, could not be reached for comment. Two workers who had helped disconnect the jib from the tower crane were standing atop the crane's cab at the time of the accident. The boom on the 14-wheeled crane operated by Weaver struck the southeast corner of Williams Hall and prevented the crane from fully tipping over. That crane's arm snapped from the boom and fell onto the top of Williams Hall. ISU painter Bill Bieber was glazing and caulking windows on the south side of Williams Hall when he heard the sound of buckling steel. He looked up as the jib from the crane toppled onto and over the roof's edge about 20 feet from him. "It made a thundering crash and everything was swaying my direction," said Bieber. "You can't predict where it's going to bend and buckle. You just start trying to get away and hope you moved in the right direction. "It's a miracle nobody was hurt. It's a noise I don't ever want to hear again," Bieber said. More cranes were brought in to help remove the damaged equipment from the rooftops Friday afternoon. The crane's base tower is 120 feet tall. The jib, or extension, can be up 240 feet long and is used to shuttle building materials. The crane can lift a 6,600-pound load when the trolley is 135 feet from center and up to 24,000 pounds when it's closest to center. When in use, tower cranes are the most stable hoisting devices at a construction site, said Steve Fonderoli of Country Crane in LaSalle. "Once a tower crane is assembled, they're the safest crane on the site because of all the limit switches, which won't allow the crane to pick up more than its capacity," said Fonderoli. He said the degree of difficulty in assembling and disassembling it is "the most dangerous aspect of the tower crane." OSHA standards require the crane to be shut down when the wind reaches 20 mph. The top wind speed as recorded by ISU Friday was 17 mph

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[8] Ambec,S. etal. (2013), The Porter Hypothesis at 20: Can environmental regulation enhance innovation and competitiveness?, Review of Environmental Economics and Policy, Vol.7/1, pp.2-22, http://dx.doi.org/10.1093/reep/res016

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