Another bomb disposal error

#1
Not to be outdone by the Bavarians in Munich, the bomb disposal people in Viersen, just down the road from here have had a go at improving the neighbourhood. The only link I have is German news, but here goes: Viersen: Bombensprengung richtet schwere Schäden an : Topnews
Basically they are saying that despite precautions heavy damage has been caused.
Eodmatt et al, where are you when we need you?
 
#2
As the ordnace is from the 2nd bash and it caused widespread damage to German property I'd say "Working as intended". Unfortunately a tad late.

My German isn't as good as it was but I couldn't see there were any deaths, which is good.
 

Wordsmith

LE
Book Reviewer
#3
I like to think of it as the UK's contribution to boosting the local German economy. Thanks (belatedly) to the RAF, there will now be a boom in the local construction industry. This will lead to explosive growth.

Wordsmith
 
#5
Having had a further gander at the article it would appear that a number of houses are badly damaged or unusable, experts are checking to see if other damaged houses are in danger of collapse. I wonder what the Sprengmeister thought as the bomb went off:
a) Shit, there goes my bonus.
b) F**k, that was loud.
c) Hope the boss has paid the insurance premiums.
d) Maybe I should stick to firework displays.
 
#6
All I hear on the local radio, is such and such road/area has been closed off, so that authorities can blow a WWII bomb up after yet another find! Not surprising, considering the tonnage that was dropped around here!
 
#7
It was reported that they blew it up because it was thought the building workers that "discovered" it had activated a delayed-action fuse . Another bomb was found in Ismaning( near Munich Airport) by a guy testing his new metal detector.
 
#8
Couldn't be moved and had to be done in a bit of a rush due to it having an "Acid fuze" (whatever one of those is) and having been disturbed and moved by the diggers.

Could have been worse if it had decided to do its thing when it was dug up.
 
#9
here is a google translation:



© Theo Titz / DAPD
Three weeks after the explosion of a bomb from the Second World War in the Schwabing district of Munich, where millions of dollars in damage caused, was on Monday night in Viersen in the Lower Rhine also a dud checks busted, which had previously been discovered during construction work.

As in Munich were also in Viersen despite all precautions to prevent damages in the area. As the district of Viersen announced late at night, with the detonation of five-pound bomb with acid fuses were damaged several houses, some seriously. A total of four houses affected, with a house, the wall was torn out. Structural engineers are currently engaged in the study houses of possible risk of collapse. If necessary, the damaged buildings are demolished.

The explosion on Monday evening a few hours after the discovery of the bomb, however, was inevitable, as the senior explosives expert Dieter Daenecke said. Because the bomb was moved from the construction workers is relatively high and even slid into a ditch, was to assume that the long-time fuze was set in motion, why haste was necessary.

Before detonation approximately 8,000 residents were evacuated within a short time. Except for residents of heavily damaged homes until Tuesday morning, all return.


Read more about Viersen: bomb blast targeted at heavy damage: Top news by Topnews : News & Nachrichten aus aller Welt : Topnews
 
#10
Just out of interest, would covering such a device in tons of earth before setting it off, smother the explosion or simply create more destructive flying debris when it went 'bang'?
 
#11
I was thinking that with the last bomb, I would have thought tons of sand would dampen the blast and have little fragmentation effect.
 

Wordsmith

LE
Book Reviewer
#12
Couldn't be moved and had to be done in a bit of a rush due to it having an "Acid fuze" (whatever one of those is) and having been disturbed and moved by the diggers.
WW2 delay fuses were based on a strip of acetate being eaten away by acid. When the acetate had been dissolved, it released a firing pin which in turn set off the detonator. The bomb was safe until it fell away from the aircraft whereupon a cord dragged a metal rod to break the acid vial to let the acid start working on the acetate. Delays could be from a few minutes to a couple of days.

If the vial didn't break on dropping from the aircraft and survived the impact, the bomb was a dud. I'm guessing the German bomb disposal people thought the acid had been released when the bomb was disturbed by the digger.

Wordsmith
 
#14
Water suppression could well have prevented some damage. But seeing as it was in Germany, well done RAF ... got there in the end didn't we?
 
#15
Water tamping (great technique used it many times) and loose sand are good if you get the result you're after.

If you have a misfire or partial, you've just made a much bigger problem for yourself.

As a general rule you use 40 filled sandbags for every 1 Kg of explosive. When dealing with large dems the use of sandbags quickly becomes impractical.

What is very useful is the use of 1 Tonne sand bags or the 1,000 ltr Cubes of water to build traverses as opposed to tamping.

In the true sense of Blue Peter

Here’s one made earlier:
 

Attachments

#16
Did the smothering of the area with suds a-la Ni in the early 70's have any effect? or am I answering myself when I say they didn't use it for long.
 
#17
Not surprising, considering the tonnage that was dropped around here!
Same round here theyre forever "finding" things that were dropped on Mannheim/Ludwigshafen und Karlsruhe.
Wouldn't want to be the dumper-truck driver mind you.
IIRC when they were widening the motorway not far from here a digger dirver was killed when he found a large bomb.If memory serves they were VERY lucky because it´s one of the main North/South routes and had it have gone off an hour eariler or later a lot of people would have lost thier lives
 
#18
Water suppression could well have prevented some damage. But seeing as it was in Germany, well done RAF ... got there in the end didn't we?
The one from Munich was a Yank bomb. And Wordsmith is partialy right. There existed several British and American long time delay fuzes. The British No.35 nose delay fuze used an arming pin, which was pulled out by a lanyard once the bomb was dropped. A springloaded bolt then crushed a phial of acetone, which then would soften a stack of celloid disks, the last one was attached by a screw to a springloaded firing pin, which, when the last disk became soft enough, would release and hit a primer. This one is not boobytrapped.
But there existed other long time delay fuzes as well. The American M123A1 and M124 and the British No.37 and No.17 delay fuzes were boobytrapped against removal. All of them were installed in the rear fuze pockets and were armed by a small propellor, which turned in the slipstream after the bomb was released (and a safety pin / fork attached to a lanyard pulled out). This would turn a screw, which would crush the acetone phial inside, same as in the No.35 fuze. But the fuzes also had a two part body, which was screwed together inside the fuze pocket. An excentric grove in the inner part held a small ballbearing, which would jam in the fuze pocket threads and stop the inner part from moving if somebody would try to unscrew the fuze. The fuze body would split and other ball bearings inside would be allowed to move outward, freeing the striker to hit the primer.
The British fuzes could be fooled by unscrewing them fast enough, so that the striker would just hit empty air (German EOD staff developed a kind of remotely fired rocket powered spanner, but it was still a risky business).
The American fuzes, once installed can´t be removed without setting off the bomb.
Berlin police EOD use a method where they use small linear cutting charges to split the bomb casing so that they can remove the main charge and blow up the fuze seperately, but for this you need free access to the whole bomb. Another method is to cut the bomb casing around the fuze, but this is also risky.
These bombs mainly failed to explode during the war because the position they came to rest in didn´t allow the liquid acetone to rear the delay disks, so that only the vapours worked. After 70 years nobody can tell what the bomb looks like on the inside. (I got the information above years ago from some West Berlin police bomb disposal people, with whom I had contact when I was in the civil defence)
Back in the late 1970s an American bomb exploded under a residential road in the West Berlin district of Buckow. Fortunately it happened early on a sunday morning when everybody was still in bed.
According to an interview in Spiegel magazine a few weeks ago with the bomb disposal guy in Munish, the bomb was first in a very unaccessible position and the fuze was completely corroded in. He said that they had not choice but to blow it up in situ. Accoring to him a small shock would have been enough to set it off. They are also quite wary, because two or three years ago three bomb disposal techs got killed when a WW2 bomb exploded, so they don´t take any chances.
 
#19
Just out of interest, would covering such a device in tons of earth before setting it off, smother the explosion or simply create more destructive flying debris when it went 'bang'?
If its just earth or sand, then as said its very effective. Unfortunately earth just isn't like that it's full of stones and other hard matter that becomes kinetic when thrown from an explosion.
 

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