Friday, July 11, 2008

How unsafe are topless tower cranes?



Yesterday July 10 a tower crane collapsed in Rotterdam on top of the building it was working. The operator was killed. The crane was a topless tower crane. It broke off just under the operator cabin. It was the same type of crane as the two New York accidents earlier this year, March 30 and May 15. In one case a collar broke as the crane was being jacked, in the other case the lifting arm broke off, in the same place it had broken an been welded before. Here is an analysis from a similar tower crane accident in San Francisco. Here is one (two) in London, mentioning another in Battersea reporting the arm of the crane including the cabin coming off the tower.



I can't help but wonder: How safe are topless tower cranes? Even though I read they are supposed to be safer than other types of cranes including the tower cranes with top, I did a little search on the internet and it seems that when the other cranes collapse in most cases there is an obvious human error in play, like very large load combined with a large lifting radius. In many cases "human error" is an understatement and the operators amply qualify to be nominated for a Dodo award. I'm not even mentioning the accidents when a crane is lifting something out of the water. (That happened to us once, we didn't realize that the vacuum force of the water pulling on the bottom surface of the object was multiplying the weight with a factor... big mistake, the crane went in and we needed a second crane to lift the first one out. See, that's why I am not mentioning..) On the other hand tower cranes seem to want to collapse when the operator has a cramp in his little finger, still the cause is always reported as human error.

The workers on the Rotterdam site report that this could not have been the drivers fault. Before the crane broke the operator succeeded to bring the load back closer towards the crane tower thus saving the lives of others who were working in the vicinity underneath. This was not a reckless crane operation on a site with insufficient supervision. No blame can be put on the workers, the fault will have to be sought higher up this time. A good man died, let's take this problem serious. How unsafe are topless tower cranes and can they be made safer?

3 comments:

Dee Jay said...

Mr. E sent me the following email with directions about putting the alert thingy on my blogger page. It wasn't difficult at all! I absolutely love this feature! It makes blogger easier to keep track of my favorite blogs!

Are you blogging here or at Vox? If you're doing both places, I'm going to change my alerts to blogger. It's so much easier for me to check them here because Vox sites can take forever for my poor old dial up to load. : )

Anyway, this is the email Mr. E sent me about how to set up the alert thing here at blogger:


Step 1. From your Dashboard, click the link called "Layout"
Step 2. If you're not already there, click the tab called "Page Elements"

Pause. This Page Elements page allows you to add (wait for it) Page Elements to your blog. You can add them to any column. Unpause.

Step 3. Find the link called "Add Page Element" and make sure it's in the column where you want to add the Page Element. Like on mine, it's in my left column.

Step 4. After Step 3, you're going to get a pop-up box with all kinds of nifty little widgets you can add. The one you want is called "Blog List". Click the blue "Add to Blog" box.

Step 5. Now you'll have a configuration box that allows you set a number of variables. You'll also see a link in this box called "Add a Blog To Your List". Clicking that allows you to put the URL (web address) in of the various blogs you want to add. There's one caveat and that's that the blog you're adding must have an RSS feed for the Blog List to use. If it doesn't, you can't add it. Luckily most blogs these days, including all those Vox blogs, have feeds that this widget automagically detects.

Step 6. After you've added all the blogs you want to add, click the orange "Save" box and it will add it to your blog. On the Page Elements page, you can drag and drop it to move it to a different spot in the column which is kinda handy.

Step 7. Drink. Well, that's what I do. Well, actually I do that no matter what I'm doing. That's just how I roll.

thyme said...

Woot! It works!

Reader Wil said...

The accident was terrible. I am glad you are drawing instead of driving a crane.

I like blogspot very much, because of the memes and the people I meet by them.