Levi’s Stadium is the first new NFL stadium to be built in California in 50 years and cost about $1.2 billion. The stadium seats about 68,500 fans and is the first pro football stadium to achieve LEED Gold certification. In fact, 49ers officials are so proud of the stadium’s sustainable status that visitors can actually view display inside the stadium that shows how much energy and water the structure is using in real time.
The video below captures the full 29-month construction of the stadium through the opening day kickoff. To capture it, EarthCam used three of its megapixel construction cameras which snapped more than 200,000 images. Those images and more than 1,250 panoramas were stitched together to form the video.
Nylon slings are one of the more common tools a dogman and rigger will use. They have their advantages over chains as they are kinder to the load being lifted. When attaching directly to items such as vending machines, motors, painted metal, plaster board you generally use nylon slings as chains would mark / damage these objects somewhat.
Slings are classified by color and black stripes. This is a rule of thumb and you need to always refer back to the tag for lifting capacity but each black stripe represents each tonne of capacity eg. 2 stripes 2 tonne sling
Color coding is as follows
Purple = 1 tonne capacity straight lift
Green = 2 tonne capacity straight lift
Yellow = 3 tonne capacity straight lift
Grey = 4 tonne capacity straight lift
Red = 5 tonne capacity straight lift
Brown = 6 tonne capacity straight lift
Blue = 8 tonne capacity straight lift
Orange = I have seen both 10 tonne and 20 tonne slings that are orange
Slings often have a number of black stripes to indicate capacity, as the picture shows 3 black stripes for 3 tonne capacity
There are mostly two types of nylon slings you will use - endless and flat webbed slings. The endless is endless and the flat webbed has eyes at either end
To make slings last
Store nylon slings out of the sun. UV light breaks down and weakens the slings so the longer they are out of sunlight the longer they will last
Nylon slings should NEVER be used to lift reo bars, the bars will tear the slings enough that they are no longer usable, also be careful with steel wall framing this can have sharp edges also.
The object may require some packing to protect it and the slings on its corners. A piece of cardboard or rubber is often sufficient or you can purchase a plastic that sits on the corners.
Dont leave slings on the ground, dirt ages the sling and can get into the core causing wear to the sling.
Keep away from heat, if you are cutting with an oxy torch or a grinder make sure the slings are a safe distance away, nylon slings melt extremely easily.
Chemicals can also damage slings so make sure they are not stored where chemical exposure can occur.
Mildew will damage slings so make sure they are stored in an area free from moisture
If possible the best way to store slings is to make a wall rack and hang them off that inside, we use a small shipping container, by hanging off the wall they stay nice and dry, if you fold up and store in a tool box they can get musty.
If sling has damage such as cuts or tag is missing or unreadable you should not use the sling, it should either be replaced or if possible reinspected by the manufacturer, repaired and re tagged. Nobles offers this service, its not feasible to do on the smaller 1 or 2 tonne slings but for the 10 or 20 tonne slings defiantly worth while.
I appreciate any comments left below so get in on the conversation and start typing!!!
If you wish you can follow me on twitter @cranecrews
I forgot to mention but how a load is hooked up and the type of load affects the slings lifting capacity. Once you have been a dogman for a bit you are always aware of this. As you can see hooking up a square load via a 'reeve' or 'choke' reduces the capacity by 50%, its 25% on a round load. A basket hits on a round load doubles the load capacity eg a 1 tonne sling can lift 2 tonnes. 2 slings directly attached to a load with an angle of 120 degrees reduces the capacity by 50%
Today at work I noticed an object hovering over our work site, I became quite concerned when I realised it was a drone (unmanned aircraft) with camera fitted. I found out that it was taking aerial photos for the real estate agent, which was quite a relief... however it does make you think about the possibilities and how they can be used in construction.
Single lift bags are as the name implies bags that should only be lifted once, when they are delivered to site.
The bags have the safe working load labeled on the side of the bag, as we can see from this bag the SWL is 1000kg. This bag has a safety factor of 5:1 meaning that it will fail at 5 times its SWL. Most often these bags are used for delivery of sand, blue metal, gravel or soil to site. Weights vary but for dry sand they usually weigh 900kg, blue metal is around the same, weights increase if wet. They can be a convenient way of spreading material around by cutting the base of the bag when it is lifted with the crane and moving to the desired area.
There are some very important things to keep in mind when lifting these, ALWAYS USE ALL FOUR LOOPS. I have seen lazy dogmen try to only hook up two loops, for this they should be kicked off site! Also if the bags have been in the sun, even just a week, they start to break down, loosing a great deal of strength. If you lift a bag that has been in the sun for a while there is a good chance the loops will fail, causing the bag to fall and this can cause serious injury and property damage.
Also, be careful not to bump the bags into anything, as they rip quite easily.
The first three speakers have been announced for the next International Tower Cranes (ITC) conference, to be held in London, UK, on 27 and 28 May 2015.
The International Tower Cranes (ITC) conference is aimed at tower crane owners, users, manufacturers and others responsible for the safe planning, implementation, operation and maintenance of tower cranes.
Keynote speaker at ITC 2015 will be Philippe Cohet, chairman at Arcomet, one of the world’s largest tower crane rental companies. Cohet will present a unique perspective on the tower crane value chain and the market worldwide. Prior to joining Belgium-headquartered Arcomet in March 2014, Cohet, from France, spent ten years on the manufacturing side of the industry, at Manitowoc and its tower crane manufacturer Potain.
Also speaking at ITC 2015 will be Dave Holder, director and general manager at tower crane specialist HTC Plant in the UK. Holder has been in the crane industry for all 33 years of his working life. He has worked his way up to his current position where he is responsible for the day to running of a business with the largest tower crane rental fleet in the UK. His presentation will tackle the topic of how to attract new talent to the industry, including apprenticeships and other training.
Heinz-Gert Kessel is the third speaker to be announced. Kessel, from Germany, is widely acknowledged as a leading global authority on tower cranes. He will compare the different design approaches of European and Japanese luffing jib tower crane designers. His presentation will discuss the possibility of certain features from the Japanese cranes being incorporated into new models for Europe and the rest of the world while others will remain as requirements just for the home market.
In addition to having a full time job working in the crane industry, Kessel has written comprehensive technical articles about tower cranes since 1986 and has been a regular contributor to International Cranes and Specialized Transport magazine since the beginning. He has also co-authored a popular historical technical reference book on tower cranes.
Organised by International Cranes and Specialized Transport and its publisher KHL Group, International Tower Cranes 2015 will be held at the Millennium Gloucester Hotel in west London, UK, on 27 and 28 May. It will start with a networking reception on the evening of 27 May, followed by a full-day conference programme on the 28th. ITC 2015.
The event will include presentations on tower crane innovations, rental trends, project reports and safety issues. Likely topics also include higher capacity cranes, dealing with ever more confined space and congested work sites. The possibility of arranging a tower crane site visit on the 27th, open to all delegates, is under investigation.
An invitation to submit proposals for presentations has will remain open until the end of 2014. Suggestions for potential topics should be sent to Alex Dahm, International Cranes and Specialized Transport editor (firstname.lastname@example.org +44 1892 786206).
ITC was most recently held in Berlin, Germany, in November 2013, where it attracted almost 150 delegates from 23 countries worldwide.
More information on the conference will be published as it becomes available at: www.khl.com/itc
Terex has developed a new range of luffing jib tower cranes, which have two and half times the load moment than the previous largest Terex crane.
Dubbed the CTL 16000 crane, it also has a ten metre longer jib than the previous model.
“We have decades of experience in luffing jib cranes. To create the CTL 1600 tower crane, we tapped into all we knew about them and went a step further,” Marco Gentilini, vice president and general manager for Terex Tower Cranes, explained.
Topping the existing Terex tower crane portfolio of eight CTL luffing jib models, the new extra large CTL 1600 crane provides heavy lifting power with easy assembly, operator comfort, and increased job site safety.
It has a maximum lifting capacity of 66 tonnes, a maximum load moment of 1600 metres tonnes, and is equipped with an extra long 75 metre jib.
"This crane offers extremely high lifting capacities and reach as well as ease of transport and assembly," the company stated.
The CTL 1600 has a maximum freestanding height of 89 metres on a concrete base and 88 metres on a chassis.
It uses HD 33 tower segments, which come equipped with pre-assembled tower platforms, aluminium ladders, multiple lifting points, and Terex's new "Engage System".
"This crane offers extremely high lifting capacities and reach as well as ease of transport and assembly," Terex said.
Apart from being the largest and heaviest lifting model in the Terex luffing jib tower crane range, the CTL 1600 also has a number of innovative features focused on increased performance, ease of assembly, and safety.
These features include the standard jib walkways and handrails for a safe working at heights environment for technicians during set up and maintenance.
All of its hoisting and luffing winch drums are linked to their own separate emergency braking system, which at the press of a button stops operation quickly, but at a gradual enough pace to avoid blocking or the potential of ropes whipping.
An anti-collision system helps the operator plan and execute life while avoiding collisions with other cranes or nearby buildings.
Two cameras linked to an operator display screen increase the user's visibility and enable the operator to zoom in and out as required to gain a better understanding of proximity.
A folding platform and folding A-frame which can be transported in a single piece on one standard truck slashes transportation costs and aids cost-efficiencies.
An automatic slewing ring lubrication feature also means less time is spent on maintenance.
The CTL 1600 also has a third hoist on the counter job that can be used as a service derrick for assembly.
It is also equipped with two pull lines that combine the ability of heavy lifting with fast lifting speeds.
Ergonomics were also in focus during its development, with the crane featuring a Terex Cranes EVO 15 operator cab.
Built with feedback from users, the EVO 15 cab features five large windows for excellent visibility; for ventilation, its front window and back door open; while sliding sunscreen blinds are available for side, front and upper windows.
An all stainless-steel electronics panel is located in the cabin platform providing excellent protection from different weather conditions.
Just personally I like the cranes specs, 89m freestanding is impressive but heck what an ugly crane
@cranecrews on twitter
WARNING- THIS HAS NOTHING TO DO WITH CRANES OR RIGGING!
Interesting article I read about the cover up by the Australian Government of bribery and corruption, also highlights the highly controlled Australian media. Have decided this needs to be re posted, screw the consequences.
From press release
"With this order, the worst in living memory, the Australian government is not just gagging the Australian press, it is blindfolding the Australian public. This is not simply a question of the Australian government failing to give this international corruption case the public scrutiny it is due. Foreign Minister Julie Bishop must explain why she is threatening every Australian with imprisonment in an attempt to cover up an embarrassing corruption scandal involving the Australian government."
"The concept of 'national security' is not meant to serve as a blanket phrase to cover up serious corruption allegations involving government officials, in Australia or elsewhere. It is in the public interest for the press to be able to report on this case, which concerns the subsidiaries of the Australian central bank. Who is brokering our deals, and how are we brokering them as a nation? Corruption investigations and secret gag orders for 'national security' reasons are strange bedfellows. It is ironic that it took Tony Abbott to bring the worst of 'Asian Values' to Australia."
From what I understand, the Reserve Bank of Australia went around engaging in classical corrupt conduct in foreign countries.
In the USA they have a law called
US foreign corrupt practice act of 1977
this act makes US companies liable for prosecution in USA for engaging in corrupt conduct eg. bribery to obtain business offshore, even though the offense occurred outside the USA.
In Australia we have a government orginisation at the pinnacle of Australian government, engaging in corrupt conduct and when this comes to light... the government tells the media not to report it, and they do as they are told. Unfortunately at this point in time we do not have the transparency and first world government they have over in the US, just the government that we deserve! :)
This is an old article from June 2011 but one I find very interesting, from looking at the wage rate makes you wish you lived in New York!
Just as cranes tower over building sites, the salaries of the people who run them tower over those of other construction workers.
Some crane operators and related trades in New York City make upwards of $500,000 a year in pay, overtime and benefits, according to the Real Estate Board of New York, which represents the construction industry.
The group says that some of the workers pulling down the biggest salaries at the World Trade Center aren't even operating equipment. It says about 50 workers are in unnecessary positions, such as relief crane operators, mandated by the union contract.
"If you want to be paid for seven or eight hours, you should work for seven or eight hours," said Steve Spinola, president of the Real Estate Board.
Officials for the two operating engineer unions, which represent 6,600 crane operators, maintenance engineers and excavators in New York, didn't return calls seeking comment.
Operating engineers are at center stage as the construction industry tries to hammer out new agreements with some of the city's most important unions. About two dozen contracts expire June 30.
The operating engineers represent just a small fraction of the 101,000 construction workers in the city, but they play an outsize role. The men operating the big cranes must lift virtually every beam in a skyscraper, and they thus help control the pace of work for an entire site. Running a crane takes a lot of skill. If a crane operator makes a mistake and drops a load, workers can die.
Jeffrey Grabelsky, director of Cornell University's construction industry program, said that there may be antiquated work rules for operating engineers that need addressing. But he adds, "These workers are incredibly skilled, have enormous responsibility and make an invaluable contribution to one of the most important industries in the New York City economy."
Non-union workers make up about 40% of the construction work force, up from 10% during the 1970s.
Not so for crane operators, who are union members.
Crane operators are currently licensed by the city. The operating engineers union controls much of the process because training requires supervision under licensed operators, and most of them are unionized.
That could change. The city says it intends to begin using a national test for crane operators. That could open up the market for crane operators in other cities to work in New York. The city hasn't said when it will make the switch.
A crane operator in New York City earns $82.15 an hour in base pay and benefits, according to the Engineer News-Record, a trade publication. That's well's above the $66 an hour he would earn in Chicago or the $39 an hour in Washington, D.C.
But the real reason New York crane operators and other operating engineers earn such big salaries is overtime and benefits. A relief crane operator working 56 hours of overtime per week for 52 weeks will earn $332,667 in overtime and $159,053 in overtime benefits at the World Trade Center. As a worker's salaries go up, so do the amounts employers must kick in for annuities and pensions.
The Real Estate Board there are currently 14 unproductive workers at the World Trade Center earning $400,000 or more in regular pay and overtime.
The World Trade Center has 16-hour work days, said Hope Cohen, associate director for the Center for Urban Innovation at the Regional Plan Association."They add up really fast."
Work rules at the World Trade Center require that every crane operator be accompanied by a relief crane operator and an oiler—a person that starts up the crane—for the entire time a crane is operating.
To be sure, many workers don't work for 52 weeks works straight while logging 56 hour of overtime a week. But many workers are on site close to year round while working 16-hour days.
"Our clients are telling us that union construction has the best quality, is the most efficient, is the most reliable, is the most productive, but is the most expensive," said Jay Badame, president and a chief operating officer with Tishman Construction Corp., while speaking earlier this month at an event on construction costs. Tishman is one of the construction manager at the World Trade Center.
The 30% premium that builders pay for union labor needs to be cut to 10%, Mr. Badame said. The city's construction unions should pressure those unions with unproductive work rules to make changes, which would cut the cost of organized labor, he said. "The unions should police themselves," he added.
Correction & Amplification
A national exam will be required to obtain a license to operate certain construction cranes in New York City. An earlier version of this article incorrectly said that the national exam would replace city licensing.
Missed an article?
Type what you are looking for in the search bar or click on the archives