Sandbag - China Quality Medical Supplies - China Medical Elastic Bandage
Usage
Usage
Sandbags may be used during emergencies when rivers threaten to overflood, or a levee or dike is damaged. They may also be used in non-emergency situations (or after an emergency) as a foundation for new levees, or other water-control structures. Sandbags are not always an effective measure in the event of flooding because water will eventually seep through the bags and finer materials, like clay, may leak out through the seam. After usage, dry sandbags can be stored for future use. Wet bags need to be disposed in a landfill as they may be contaminated by chemicals and fecal matter.[citation needed]
The military uses sandbags for field fortifications, or as a temporary measure to protect civilian structures. Because burlap and sand are inexpensive, large protective barriers can be erected cheaply. The friction created by moving soil or sand grains and multiple tiny air gaps makes sandbags an efficient dissipator of explosive blast. The dimensions and weight of sandbags used in fortification are carefully calculated so that the bags can be interlocked like brickwork and are not too heavy to lift and move around. They may be laid in excavated defences as revetment, or as free-standing walls above ground where excavations are impractical. As plain burlap sandbags deteriorate fairly quickly, sandbag structures that are meant to remain in place for a long time may be painted with a portland cement slurry to reduce the effects of rot and abrasion. Cotton ducking sandbags last considerably longer than burlap and are hence preferable for long-term use. However, the vast majority of sandbags used by modern militaries and for flood prevention are made of circular woven polypropylene. The easy availability to military personnel, size and construction of the bags has also led to the use of sandbags as makeshift hoods for prisoners of war.
Other uses
Sandbags are also used for disposable ballast in gas balloons, and as counterweights for theatre sets.
Sandbags have been used since at least the late 1700s.[citation needed] They have traditionally been filled manually using spades. Since the 1990s, machine-filling has become more common, which allows the work to be done more quickly and efficiently.
During the Second World War, sandbags were also used as extemporized "soft armor" on American tanks, to help defeat German anti-tank rounds.
Sandbags are also used in weight training, either homemade or commercially obtained. Another common use of sandbags is to put them in the trunk of rear wheel drive cars to increase traction in inclement weather.[citation needed]
In games and various kinds of adversarial settings, the term sandbagging refers to the practice of purposely placing oneself in a weaker position so as to give the deceptive impression that one is less skilled than one truly is.
A often unknown use of sandbags includes panel restoration and recreation. The sandbag being used behind the panel as it is beaten by a hollowing hammer to create initial angles and curves.
Sandbags are also being used to make inexpensive homes that are energy friendly.
In slang
"Sandbag" can also refer to a simple weapon consisting of a small bag filled with sand for use as a cudgel typically by criminals, or to the act of striking a person on the head with such a weapon. This usage is obsolescent in normal speech, appearing mainly in legal codes. However the verb form is extended metaphorically in several slang expressions.[citation needed]
See also
Wikimedia Commons has media related to: Sandbags
Hesco bastion
Sandbagging
References
^ Hunnicut, R.P. "Sherman: A History of the American Medium Tank" ISBN 0-89141-080-5
Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (June 2008)
External links
A Directory of UK local council sandbag policies.
California Department of Water Resources and the California Conservation Corps - How to fill and place sandbags.
US Army Corps of Engineers Sandbagging pamphlet (PDF)
US Army Corps of Engineers - How to use Sandbags (PDF) (HTML)
Uline-Where to buy sandbags in an emergency.
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Military fortifications
Since ancient times
Abatis Castra Circular rampart Cranng Defensive wall Hill fort Palisade Stockade Stronghold Sudis Trou de loup Vallum Wagon fort
Since Middle Ages
Area denial weapons Arrowslit Barbican Bastion Caltrop Castle Concentric castle Cheval de frise Citadel City gate Curtain wall Drawbridge Embrasure Gabion Guard tower Keep L-plan castle Moat Murder-hole Peel tower Rduit Tower house Turret Wall tower Watchtower Yett
Since Early modern period
Blockhouse Caponier Outwork Polygonal fort Punji sticks Sandbag Station Star fort
Since 19th century
Barbed wire Barbette Border outpost Bunker Casemate Coastal artillery Gun turret Land battery Land mine Outpost (military) Trench warfare Wire obstacles
Since 20th century
Barbed tape Concertina wire Defensive fighting position Spider hole British "hedgehog" road block Czech hedgehog Dragon's teeth Electric fence Flak tower Hesco bastion Main Line of Resistance Sentry gun
Categories: Bags | Flood control | Fortification | SoilHidden categories: All articles with unsourced statements | Articles with unsourced statements from July 2009 | Articles with unsourced statements from June 2008 | Articles needing additional references from June 2008 | All articles needing additional references
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