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A blasting mat is a mat usually made of sliced-up rubber tires bound together with ropes, cables or chains. They are used during rock blasting to contain the blast, prevent flying rocks and suppress dust. == Use == Blasting mats are used when explosives are detonated in places such as quarries or construction sites. The mats are placed over the blasting area to contain the blast, suppress noise〔 and dust as well as prevent high velocity rock fragments called fly rock (or flyrock) from damaging structures, people or the environment in proximity to the blast site. The amount of fly rock can be reduced by proper drilling in the bedrock for the charges, but in practice it is hard to avoid. Mats can be used singly or in layers depending on the size of the blast charge, the type of mat and the amount of protection needed.〔 They can be used horizontally on the ground or vertically hanging from cranes or attached to structures. In the vertical capacity the mats are sometimes referred to as blasting curtains. When used in blasting tunnels the mats can be placed in patterns designed to let the mats stabilize each other and to direct the discharge from the explosion out of the tunnel. To prevent mats from being displaced by the explosion, they can be covered with layers of soil or anchored to the ground.〔 Anchoring the mats is also essential when the blasting is done on an incline where the mats may slide down from the rock face. Blasting mats are often used in combination with blasting blankets as an additional layer over the mats. The blankets are larger than the mats designed to retain the fragments that have managed to pass through the mat. Blasting blankets are used for both horizontal and vertical blasting. Blasting blankets consist of a fine-mesh strong net or industrial felt from paper mills. Both mats and blankets are designed to let air and gasses from the explosion pass through the cover and retain fragments.〔 Knowledge of the proper use of blasting mats is required in order to obtain a blaster's certificate issued by organizations such as the WorkSafeBC. Blasting mats made from used tires can serve a double purpose as road stabilizers, or road surface, in locations where roads leading to the blasting site are unstable or nonexistent, or in areas where the surface needs to be protected from heavy machinery. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blasting mat」の詳細全文を読む スポンサード リンク
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