Ammunition and explosives – Blasting – Mat or deflector
Patent
1995-10-16
1998-02-17
Nelson, Peter A.
Ammunition and explosives
Blasting
Mat or deflector
F24D 500
Patent
active
057193509
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION OF THE INVENTION
Throughout this specification the term "fly" is used describe material ejected from the site of an explosion into an adjacent area.
In the case of using explosives to demolish building structures, the "fly" will typically be pieces of the building structure close to the site of the detonation but it can also include objects or parts of objects placed adjacent to the charge to be detonated for the purpose of "fly" suppression. It is conventional practice to suppress "fly" created by an explosive blast and articles such as sand bags, old tires, bales of straw, old vehicles, conveyor belting, submarine nets and loose sand have all been used for this purpose. It is also self-evident that in the case of an explosion conducted below the surface of a body of water, the water itself serves to suppress "fly".
In view of a recent unfortunate accident in the U.K. involving the death of a spectator to the explosive demolition of a high-rise building, the question of "fly" suppression has received considerable publicity and one important aspect of this invention is concerned with a novel method of suppressing the incursion of "fly" into an area to be protected, a novel method of preparing a building structure for explosive demolition and to novel equipment for employment in the aforementioned methods.
Expressed as a method of suppressing the incursion of "fly" from a detonation charge into an area to be protected invention includes locating a volume of liquid contained in a flexible-walled container between the charge and the said area prior to detonation of the charge.
In accordance with this aspect of the invention a method of preparing a building structure for explosive demolition comprises locating empty flexible-walled containers between at least one site of an explosive charge in the structure and its surroundings, introducing a volume of liquid into the flexible containers to expand them and subsequently detonating the charge. Since the operation of all methods in accordance with this invention are likely to involve large volumes of liquid, water is preferred, typically mains water but river- or sea-water is clearly also usable.
Equipment comprising an unfilled arrangement of flexible containers and a support structure therefor designed for employment in accordance with either of the foregoing methods constitutes a further aspect of this invention.
Flexible-walled containers filled with liquid can also be used to shield an object which is liable to explode and to provide apparatus for forming a protective shield around such an object. The protected object could be, for example, munitions for disposal, an unexploded weapon or a co-called "car bomb". In this specification by the term "car bomb" is meant a vehicle with a bomb or explosive device attached to, inside, or in the vicinity of, e.g. on the ground beneath, a vehicle. However, it will be appreciated than in this aspect the invention is not intended to be limited solely to minimising the effects of damage caused by "car bombs" since it can find application in other areas where, for example, it is known or suspected that the explosion or detonation of an object, structure or device will take place in the near future.
Whenever a car bomb or suspected car bomb is identified there is a need to respond quickly to the danger involved. Normally the emergency services will evacuate an area around the car bomb as speedily as possible. Once the area has been cleared, it may be desirable to deliberately explode the car bomb or suspected car bomb. The detonation of such a car bomb either deliberately by means of a controlled explosion or by the normal timed explosion of the car bomb itself can and often does cause great damage to property, and sometimes also to people in the vicinity of the car bomb. There is a need, therefore, for a protective shield to be erected around the car bomb as quickly as possible to limit or minimise the effects of a subsequent explosion of the car bomb.
Thus according to a further aspect of the present inventio
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Database WPI, Week 7825, Derwent Publications Ltd., London, Great Britain; AN 78-E9703A & ZA, A, 7 650 622 (T. Wilson).
Parkes John Humphries
Salter Stephen Hugh
Nelson Peter A.
Parkes John Humphries
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