The paneling teams sealed the pane with an instantly-setting caulking compound and moved quickly to the west side of the dome. Despite the safety factor, they wanted to complete the first full cross section of roof quickly to balance the stress, and Gerrick approved. Engineers believed as firmly in their calculations as they did in God, but they also believed in minimizing exposure to the Demon Murphy.
Gerrick smiled at the familiar thought and looked down as the high, clear sound of a child's voice cut through the work site's noise. A group of kids—students-to-be in the middle school—had asked permission to watch the completion of the main dome, and their teachers, after checking with the site supervisors, had organized a field trip. Needless to say, the Sky Domes' staff had impressed them with the dangers the construction equipment represented, and Grayson children learned early to take adults' warnings to heart. They were well back under the completed eastern wall, and they were staying there, but that didn't mute their avid interest. He could see their excitement even from here as they watched the panels drifting upward on their counter-grav like some sort of impossibly beautiful seed pods and chattered to one another, and he smiled. He'd talked to some of those youngsters himself this morning, and two or three had looked like they had the making of good engineers.
He let his eyes sweep proudly back up the glittering wall above the kids . . . and that meant he saw it all happen.
It started almost gently, as the most terrible accidents so often do. The first movement was tiny, so slight he thought he'd imagined it, but he hadn't. One of the primary load-bearing supports—a solid shaft of alloy orders of magnitude stronger than titanium set in a hole bored fourteen meters into solid bedrock and sealed with over a hundred tons of ceramacrete—swayed like a young tree in a breeze. But that support was no sapling. It was a vital component of the dome's integrity, and even as Gerrick stared at it in disbelief it was turning, twisting in its socket as if it had been tamped into place with so much sand and not sealed into the densest, hardest mineral building material known to man. It couldn't happen. It wasn't just unlikely, it was impossible, and Gerrick knew it, for he was the man who'd designed it . . . but it was also happening.
His eyes whipped unerringly to the supports which shared that shaft's component of the dome's weight. An untrained eye wouldn't even have known which ones to look at; to Gerrick, it was as obvious as if he'd spent hours pouring over the schematics that very morning, and his heart leapt into his throat with horror as he saw one of them shifting as well!
He stared at it for one terrible, endless instant, his engineer's mind leaping ahead to the disaster to come. It was only a moment, no more than four seconds—possibly five; certainly not more than six—yet that moment of stunned inactivity would haunt Adam Gerrick. It didn't make any difference. He knew that—didn't think it, but knew it. Too much mass was in motion. The inevitable chain of events was beyond the control of any man, and nothing he did or didn't do could make the slightest difference, yet Gerrick would never forgive himself for that moment of stasis.
A soft, almost inaudible groan came from the moving supports, and a pane of crystoplast popped free. The glittering panel dropped, no longer drifting and lovely in its counter-grav supports but slashing downward like a gleaming guillotine, and Adam Gerrick began to run.
He flung himself down the scaffolding, screaming a warning, running straight towards the collapsing horror of his dream. It was madness—a race which could end only in his own death if he won it—but he didn't think about that. He thought only of the children, standing in what was supposed to be the safest part of the entire site . . . directly under those creaking, groaning, treacherously shifting supports.
Perhaps, he told himself later, if he'd reacted faster, if he'd started running sooner, if he'd screamed a louder warning, perhaps it would have made a difference. The engineer in him, the part of his brain and soul which manipulated numbers and load factors and vectors of force knew better, but Gerrick had two children of his own, and the father in him would never, ever, forgive himself for not having made it make a difference. He saw one of the kids turn and look at him. It was a girl, no more than eleven, and Adam Gerrick saw her smile, unaware of what was happening.
He saw her wave at him, happy and excited by all the activity . . . and then he saw eighty thousand metric tons of alloy and crystoplast and plunging horror come crashing down and blot that smile away forever.
My niece is giving a book report on OSHA Safety and guidelines on construction sites. I arranged for her to have a visit to one of my company's sites which is employing two large cranes to position some very heavy and very expensive equipment. She was very excited, especially since I ordered her her very own hardhat and goggles as part of her show and tell at school. She was very disappointed because she wanted to get much closer with her video, but our safety regs prevented that type of intimacy.
"I can't get any closer than the yellow tape Uncle?"
"I'm afraid not Princess. It's for your own safety."
"But we're so far away Uncle. What could possible happen if we get half closer?"
"Something very heavy could fall on your head."
"But I'm wearing my very own hardhat. It's brand new!"
"A hardhat isn't going to do you much good if that crane falls on your head."
Only then did I see the recognition in her eyes. The crane, though seemingly very far away would cover a great distance if it were to fall. We were barely thirty feet outside its reach.
OSHA has certain guidelines regarding these matters, but safety implementations are of course left up to individual companies and scenarios. Many injuries and deaths, even to the public, occur as a result.
A couple of hours ago I received an email. "Uncle, why were those Middle School students allowed within the yellow lines of the Mueller School Dome Construction site?"
Oh shit! All of you sure you'd like her to join the forums?
I don't think they should have been. Certainly my company would never have allowed it. Nor would her Uncle. I never would have forgiven myself if something untoward would have befallen my niece. Nor would any hardhat have saved my ass from the wrath of my sister. Perhaps Honor was responsible after all.
I later arranged for my niece to climb aboard a non-deployed crane and actually work a few levers. All teeth! Redemption for Uncle!
Some of the appropriate text has been included for reference. Unedited for punctuation (italics, which doesn't properly copy on android devices) . Also, some sample OSHA guidelines on cranes has been included. Interesting that construction safety so far into the future isn't any better. Should Honor have at least morally been charged?
What is in a Site Specific Safety Plan?
The preparation of a Site Specific Safety Plan starts with the project concept. A listing of hazards and concerns developed by the owner and the design team during the concept and design phase shall be compiled and addressed in the project documents.
Requirements for access to the facilities, protection of owner’s existing operations, if any, utilization of areas of the property, protection of adjacent property and public must be addressed in the contract documents.
Hazards and concerns of the owner and the design team shall be addressed as part of the contract documents. A specific solution to the hazards and concerns need not be presented, but the contract documents shall clearly require the PC/GC/CM to address each topic. Each contract document topic included in the documents shall include the contractor’s Safety Program topic and generate a Site Specific Safety Plan topic as a response.
Location and Access. Cranes positioned near or attached to a structure can have a major impact on the structure. The allowable loads and their points of application should be clearly defined and approved by a licensed engineer. A&Es must require an analysis of cranes/derricks attached to or supported by the structure. Having large cranes adjacent to a structure may also have a detrimental effect on the structure foundation.
The determination of allowable crane locations should reflect concerns for public exposure, adjacent structures, employee and public travel paths, underground structures, previously excavated areas, overhead obstructions and all other factors which impact on safe crane and rigging operations. In addition, load travel paths may have to be defined. Areas that present a severe hazard to personnel should be declared prohibited operating areas or as restricted employee and public access areas.
The Public. The A&E must consider the impact of crane operations on the public. Noise, dust, traffic, and other typical nuisances inherent with crane operations may require restricted working hours. These considerations or requirements should be specifically part of the contract documents. ANSI A10.34, Public Protection, as well as other applicable local, state and federal standards apply.
The ASCE and, in particular, the CI Committee on Crane Safety have devoted significant efforts to the safety of the public, recognizing that because of the configuration and use of cranes, they present significantly more hazard to the public around a construction site than do other construction operations. Numerous recent crane accidents have resulted in death and injury to the public. Planning crane operations to be safe and to minimally expose the public is crucial to providing for public safety around construction sites.
Existing Facilities. Construction within the confines of an existing facility requires that the A&E consider how existing structures and personnel impact crane operations. For example, consideration must be given to such areas as parking, employee and public access, utility lines, railroad tracks and other potential obstructions. Provisions may be required prior to the start of construction for the removal, relocation and/or protection of these areas. These considerations may require constraints on the size and number of cranes and the boom lengths of individual cranes.
Hazard Description
The Bureau of Labor Statistics' (BLS) Census of Fatal Occupational Injuries (CFOI) reports 79 fatal occupational injuries related to cranes, derricks, hoists, and hoisting accessories in 1993. (2) In 1992 OSHA reviewed the accident investigation files of 400 crane incidents in general industry and construction over a 5 year period and identified 354 fatalities, an average of 71 fatalities per year. (3) While we lack adequate worker exposure data to calculate the risk of death for the entire population exposed, the risk of death among crane operators alone is significant. BLS identified eight fatal injuries in 1993 among crane and tower operators, this corresponds to a risk of more than one death per thousand workers (1.4) over a working lifetime of 45 years. According to the 1987 Bureau of Labor Statistics' (BLS) supplementary data system (23 states reporting), over 1,000 construction injuries were reported to involve cranes and hoisting equipment. However, underreporting of crane-related injuries and fatalities, due to misclassification and a host of other factors, masks the true magnitude of the problem.
The 1989 catastrophic tower crane collapse in downtown San Francisco and the 1993 mobile crane accident near Las Vegas heightened public awareness to the continuing problem of crane accidents. Since crane activities normally occur in urban areas, unsafe equipment and operations present a risk not only to workers, but to the general public as well. Two citizens were killed in San Francisco and three were killed in Nevada.
OSHA's analysis also identified the major causes of crane accidents to include: boom or crane contact with energized power lines (nearly 45% of the cases), under the hook lifting device, overturned cranes, dropped loads, boom collapse, crushing by the counter weight, outrigger use, falls, and rigging failures. (3)
Some cranes are not maintained properly nor inspected regularly to ensure safe operation. Crane operators often do not have the necessary qualifications to operate each piece of equipment safely, and the operator qualifications required in the existing regulations may not provide adequate guidance to employers. The issues of crane inspection/certification and crane operator qualifications and certification need to be further examined.
Footnotes:
https://www.osha.gov/archive/oshinfo/pr ... crane.html
and from
Crane Safety Training for Engineers and Supervisors
Presented by the Construction Institute of ASCE
Funded by an OSHA Susan Harwood Training Grant